AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 15, 1998
                                                      REGISTRATION NO. 333-
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-3
 
                             REGISTRATION STATEMENT
 
                                     UNDER
 
                           THE SECURITIES ACT OF 1933
                            ------------------------
 

                                                                          
          CITIGROUP INC.                               DELAWARE                               52-1568099
          CITIGROUP CAPITAL VI                         DELAWARE                               06-6446485
          CITIGROUP CAPITAL VII                        DELAWARE                               06-6446486
          CITIGROUP CAPITAL VIII                       DELAWARE                               06-1532080
          CITIGROUP CAPITAL IX                         DELAWARE                               06-1532083
          CITIGROUP CAPITAL X                          DELAWARE                               06-1532084
          CITIGROUP CAPITAL XI                         DELAWARE                               06-1532087
          CITIGROUP CAPITAL XII                        DELAWARE                               06-1532088
          CITIGROUP CAPITAL XIII                       DELAWARE                               06-1532089
 
     (EXACT NAME OF REGISTRANT AS          (STATE OR OTHER JURISDICTION OF                 (I.R.S. EMPLOYER
      SPECIFIED IN ITS CHARTER)             INCORPORATION OR ORGANIZATION)             IDENTIFICATION NUMBERS)

 
                              153 EAST 53RD STREET
                               NEW YORK, NY 10043
                                 (212) 559-1000
         (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)
 
                         ------------------------------
 
                           STEPHANIE B. MUDICK, ESQ.
                         GENERAL COUNSEL-CORPORATE LAW
                                 CITIGROUP INC.
                              153 EAST 53RD STREET
                               NEW YORK, NY 10043
                                 (212) 559-1000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                         ------------------------------
 
                                   COPIES TO:
 
      GREGORY A. FERNICOLA, ESQ.                FREDERICK W. KANNER, ESQ.
        SKADDEN, ARPS, SLATE,                      DEWEY BALLANTINE LLP
          MEAGHER & FLOM LLP                   1301 AVENUE OF THE AMERICAS
           919 THIRD AVENUE                      NEW YORK, NEW YORK 10019
       NEW YORK, NEW YORK 10022                       (212) 259-8000
            (212) 735-3000
 
                         ------------------------------
 
APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF THE SECURITIES TO THE
PUBLIC: At such time (from time to time) after the effective date of this
Registration Statement as agreed upon by Citigroup Inc. and the Underwriters in
light of market conditions.
                         ------------------------------
 
    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. / /
                         ------------------------------
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. /X/
                         ------------------------------
 
    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. / /
                         ------------------------------
 
    If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /
                         ------------------------------
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. /X/
                         ------------------------------
 
                        CALCULATION OF REGISTRATION FEE
                             (SEE FOLLOWING PAGE.)
                         ------------------------------
 
    THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.
 
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                        CALCULATION OF REGISTRATION FEE


                                                                              PROPOSED MAXIMUM       PROPOSED MAXIMUM
                TITLE OF EACH CLASS                      AMOUNT TO BE        OFFERING PRICE PER     AGGREGATE OFFERING
          OF SECURITIES TO BE REGISTERED                  REGISTERED               UNIT(1)              PRICE(2)(3)
                                                                                          
Debt Securities of Citigroup Inc.(5)...............
Index Warrants of Citigroup Inc.(6)................
Preferred Stock of Citigroup Inc.(7)...............
Depositary Shares of Citigroup Inc.(8).............
Common Stock of Citigroup Inc.(9)..................
Capital Securities of the Trusts(10)...............
Junior Subordinated Debt Securities of Citigroup
  Inc.(10).........................................
Guarantees of Capital Securities of the Trusts and
  certain back-up obligations(11)..................
Common Stock of Citigroup Inc. reserved for
  issuance upon conversion or exchange of Debt
  Securities, Preferred Stock, Depositary Shares
  (12).............................................
Total (13).........................................     $4,150,000,000                                $4,150,000,000
 

 
                TITLE OF EACH CLASS                        AMOUNT OF
          OF SECURITIES TO BE REGISTERED              REGISTRATION FEE(4)
                                                  
Debt Securities of Citigroup Inc.(5)...............
Index Warrants of Citigroup Inc.(6)................
Preferred Stock of Citigroup Inc.(7)...............
Depositary Shares of Citigroup Inc.(8).............
Common Stock of Citigroup Inc.(9)..................
Capital Securities of the Trusts(10)...............
Junior Subordinated Debt Securities of Citigroup
  Inc.(10).........................................
Guarantees of Capital Securities of the Trusts and
  certain back-up obligations(11)..................
Common Stock of Citigroup Inc. reserved for
  issuance upon conversion or exchange of Debt
  Securities, Preferred Stock, Depositary Shares
  (12).............................................
Total (13).........................................       $1,153,700

 
(1) The proposed maximum offering price per unit will be determined from time to
    time by the relevant Registrant in connection with the issuance by such
    Registrant of the securities registered hereunder.
 
(2) The proposed maximum aggregate offering price has been estimated solely for
    the purpose of calculating the registration fee pursuant to Rule 457 under
    the Securities Act of 1933, as amended. The aggregate public offering price
    of the Debt Securities, Index Warrants, Preferred Stock, Depositary Shares
    and Junior Subordinated Debt Securities of Citigroup Inc. and the Capital
    Securities of the Trusts registered hereby will not exceed $6,000,000,000 or
    the equivalent thereof in one or more foreign currencies, foreign currency
    units or composite currencies.
 
(3) Exclusive of accrued interest, distributions and dividends, if any.
 
(4) A filing fee aggregating $545,750 was previously paid in connection with
    registration statements filed earlier relating to the registration of
    $1,850,000,000 aggregate principal amount of securities which are being
    included in this Registration Statement. The filing fee of $1,153,700
    relates solely to the registration of $4,150,000,000 aggregate principal
    amount of securities not previously registered.
 
(5) Subject to note (13) below, there is being registered hereunder an
    indeterminate principal amount of Debt Securities as may be sold from time
    to time. Includes Debt Securities which may be purchased by underwriters to
    cover over-allotments, if any.
 
(6) Subject to note (13) below, there is being registered hereunder an
    indeterminate principal amount of Index Warrants representing rights to
    receive an amount of cash or number of securities that will be determined by
    reference to prices, yields, levels or other specified objective measures or
    changes in an index or differences between two or more indices as may be
    sold, from time to time.
 
(7) Subject to note (13) below, there is being registered hereunder an
    indeterminate number of shares of Preferred Stock of Citigroup Inc. as from
    time to time may be issued at indeterminate prices. Includes Preferred Stock
    which may be purchased by underwriters to cover over-allotments, if any.
 
(8) Subject to note (13) below, there is being registered hereunder an
    indeterminate number of Depositary Shares as may be issued in the event that
    Citigroup Inc. elects to offer fractional interests in the Preferred Stock
    registered hereby. Includes Depositary Shares which may be purchased by
    underwriters to cover over-allotments, if any.
 
(9) Subject to note (13) below, there is being registered hereunder an
    indeterminate number of shares of Common Stock of Citigroup Inc. as from
    time to time may be issued at indeterminate prices. Includes Common Stock
    which may be purchased by underwriters to cover over-allotments, if any.
 
(10) Subject to note (13) below, there is being registered hereunder an
    indeterminate number of Capital Securities of Citigroup Capital VI,
    Citigroup Capital VII, Citigroup Capital VIII, Citigroup Capital IX,
    Citigroup Capital X, Citigroup Capital XI, Citigroup Capital XII and
    Citigroup Capital XIII (each a "Trust") and such indeterminate principal
    amount of Junior Subordinated Debt Securities of Citigroup Inc. as may from
    time to time be issued at indeterminate prices. Includes Capital Securities
    which may be purchased by underwriters to cover over-allotments, if any.
    Junior Subordinated Debt Securities may be issued and sold to any Trust, in
    which event such Junior Subordinated Debt Securities may later be
    distributed to the holders of Capital Securities upon a dissolution of such
    Trust and the distribution of the assets thereof.
 
(11) Includes the rights of holders of the Capital Securities under any
    Guarantees and certain back-up undertakings, comprised of the obligations of
    Citigroup Inc., to provide certain indemnities in respect of, and pay and be
    responsible for certain costs, expenses, debts and liabilities of, each
    Trust (other than with respect to the Capital Securities) and such
    obligations of Citigroup Inc. as set forth in the Amended and Restated
    Declaration of Trust of each Trust and the related Indenture, in each case
    as further described in the Registration Statement. The Guarantees, when
    taken together with Citigroup Inc.'s obligations under the Junior
    Subordinated Debt Securities, the related Indenture and the Amended and
    Restated Declaration of Trust, will provide a full and unconditional
    guarantee on a subordinated basis by Citigroup Inc. of payments due on the
    Capital Securities. No separate consideration will be received for any
    Guarantees or such back-up obligations.
 
(12) Such indeterminate number of shares of Common Stock as may be issued upon
    conversion of or in exchange for any Debt Securities, Preferred Stock or
    Depositary Shares that provide for such conversion or exchange are being
    registered hereby. No separate consideration will be received for the Common
    Stock issuable upon such conversion or exchange.
 
(13) As described in note (4) above and the paragraph below, this Registration
    Statement relates to the registration of $4,150,000,000 aggregate principal
    amount of securities being registered hereby and an additional
    $1,850,000,000 aggregate principal amount of securities previously
    registered. In no event will the aggregate offering price of all securities
    issued from time to time pursuant to this Registration Statement exceed
    $6,000,000,000 or the equivalent thereof in one or more foreign currencies,
    foreign currency units or composite currencies.
 
    Pursuant to Rule 429 under the Securities Act of 1933, as amended, the
Prospectuses and Prospectus Supplement included in this Registration Statement
also relate to the Debt Securities of Citigroup Inc. (formerly Travelers Group
Inc.) and the Trust Preferred Securities of Citigroup Capital VI (formerly
Travelers Capital VI) and Citigroup Capital VII (formerly Travelers Capital
VII), the Junior Subordinated Debt Securities of Citigroup Inc., the Guarantees
of Trust Preferred Securities of such Citigroup Capital Trusts and certain
back-up obligations, the Preferred Stock and the Depositary Shares previously
registered under Registration Statements on Form S-3 (Nos. 333-51201 and
333-42575) of Citigroup Inc. and such Citigroup Capital Trusts, as applicable. A
filing fee of $457,250 was paid in connection with the $1,550,000,000 of
securities that remain eligible to be sold under the Registration Statement on
Form S-3 (No. 333-51201) of Citigroup Inc. as of December 15, 1998. A filing fee
of $88,500 was paid in connection with the $300,000,000 of securities that
remain eligible to be sold under the Registration Statement on Form S-3 (No.
333-42575) of Citigroup Inc. and such Citigroup Capital Trusts as of December
15, 1998.
 
                                       2

                               INTRODUCTORY NOTE
 
    This Registration Statement contains (i) a form of Prospectus (the "Basic
Prospectus") relating to Debt Securities, Index Warrants, Preferred Stock,
Depositary Shares and Common Stock of Citigroup Inc. (formerly Travelers Group
Inc.) ("Citigroup" or the "Company"), (ii) a form of Prospectus Supplement to
the Basic Prospectus relating to the offering by Citigroup of its Medium-Term
Senior Notes, Series A, and Medium-Term Subordinated Notes, Series A, in
registered form (the "MTN Prospectus Supplement") and (iii) a form of Prospectus
(the "Capital Securities Prospectus") relating to Junior Subordinated Debt
Securities of Citigroup and to the Capital Securities of Citigroup Capital VI
(formerly Travelers Capital VI), Citigroup Capital VII (formerly Travelers
Capital VII), Citigroup Capital VIII (formerly Travelers Capital VIII),
Citigroup Capital IX, Citigroup Capital X, Citigroup Capital XI, Citigroup
Capital XII and Citigroup Capital XIII (each a "Citigroup Trust" or a "Trust"
and collectively the "Citigroup Trusts" or the "Trusts"). The Capital Securities
Prospectus may be used for one or more offerings by Citigroup and the respective
Citigroup Trusts. To the extent required, the information in the Capital
Securities Prospectus, including financial information, will be updated at the
time of such offerings.
 
                                       3

                 SUBJECT TO COMPLETION, DATED DECEMBER 15, 1998
THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

PROSPECTUS
 
                                     [LOGO]
 
May Offer--
 
                                DEBT SECURITIES
                                 INDEX WARRANTS
                                PREFERRED STOCK
                               DEPOSITARY SHARES
                                  COMMON STOCK
 
    We will provide the specific terms of these securities in supplements to
this Prospectus. You should read this Prospectus and any accompanying Prospectus
Supplement carefully before you invest.
 
                            ------------------------
 
    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES OR
INSURANCE COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR
DETERMINED IF THIS PROSPECTUS OR ANY ACCOMPANYING PROSPECTUS SUPPLEMENT IS
TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
    THE SECURITIES OFFERED HEREBY ARE NOT DEPOSITS OR SAVINGS ACCOUNTS AND ARE
NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER
GOVERNMENTAL AGENCY OR INSTRUMENTALITY.
 
                            ------------------------
 
           , 1998

                               PROSPECTUS SUMMARY
 
    THIS SUMMARY HIGHLIGHTS SELECTED INFORMATION FROM THIS DOCUMENT AND MAY NOT
CONTAIN ALL OF THE INFORMATION THAT IS IMPORTANT TO YOU. TO UNDERSTAND THE TERMS
OF OUR SECURITIES, YOU SHOULD CAREFULLY READ THIS DOCUMENT AND THE PROSPECTUS
SUPPLEMENT THAT EXPLAINS THE SPECIFIC TERMS OF THE SECURITIES WE ARE OFFERING.
YOU SHOULD ALSO READ THE DOCUMENTS WE HAVE REFERRED TO IN "INCORPORATION OF
CERTAIN DOCUMENTS BY REFERENCE" BELOW FOR INFORMATION ON OUR COMPANY AND OUR
FINANCIAL STATEMENTS. THE PROSPECTUS SUPPLEMENT MAY ALSO ADD, UPDATE OR CHANGE
INFORMATION CONTAINED IN THIS PROSPECTUS. IT IS IMPORTANT FOR YOU TO CONSIDER
THE INFORMATION IN THE PROSPECTUS AND ANY PROSPECTUS SUPPLEMENT, INCLUDING
DOCUMENTS WE HAVE INCORPORATED BY REFERENCE, IN MAKING YOUR INVESTMENT DECISION.
 
                                  OUR COMPANY
 
    Citigroup Inc.'s (formerly Travelers Group Inc.) ("Citigroup" or the
"Company") businesses provide a broad range of financial services to consumer
and corporate customers around the world. Among these businesses are Citibank,
Commercial Credit, Primerica Financial Services, Salomon Smith Barney, SSBC
Asset Management, Travelers Life & Annuity and Travelers Property Casualty.
 
    On October 8, 1998, the Company changed its name from Travelers Group Inc.
to Citigroup Inc. in connection with the merger of Citicorp into a newly formed,
wholly owned subsidiary of the Company.
 
    The Company is a holding company and services its obligations primarily with
dividends and advances that it receives from subsidiaries. Certain subsidiaries'
dividend paying abilities are limited by certain covenant restrictions in credit
agreements and/or by regulatory requirements, including those imposed by federal
bank regulatory authorities, the insurance departments of a number of states,
and various capital requirements imposed by securities regulators. The Company
is also subject to certain capital requirements as a bank holding company. Each
of the Company's major operating subsidiaries finances its operations on a
stand-alone basis consistent with its capitalization and ratings.
 
    Under longstanding policy of The Board of Governors of the Federal Reserve
System, a bank holding company is expected to act as a source of financial
strength for its subsidiary banks and to commit resources to support such banks.
As a result of that policy, the Company may be required to commit resources to
its subsidiary banks in certain circumstances.
 
    The principal office of the Company is located at 153 East 53rd Street, New
York, NY 10043, and its telephone number is (212) 559-1000. If you would like
additional information about our Company, please refer to the information under
"Available Information" below.
 
                          THE SECURITIES WE MAY OFFER
 
    The Company may issue from time to time (i) debt securities ("Debt
Securities"), which may be senior debt securities of the Company or subordinated
to other indebtedness of the Company; (ii) warrants ("Index Warrants")
representing the right to receive, upon exercise, an amount in cash or number of
securities that will be determined by reference to prices, yields, levels or
other specified objective measures, or changes in an index or differences
between two or more indices; (iii) preferred stock ("Preferred Stock") in one or
more series; (iv) fractional shares of Preferred Stock represented by depositary
receipts ("Depositary Shares"); or (v) common stock ("Common Stock"), all having
an aggregate initial public offering price or purchase price of up to
$6,000,000,000, or equivalent amount in one or more foreign or composite
currencies. The Debt Securities, Index Warrants, Preferred Stock, Depositary
Shares and Common Stock are referred to in this Prospectus collectively as the
"Offered Securities." The Offered Securities may be offered separately or as
units with other Offered Securities, in separate series, in amounts, at prices
and on terms to be determined at or prior to the time of sale.
 
                                       2

The registration statement to which this Prospectus relates also contemplates
the sale of other securities pursuant to separate prospectuses. The sale of
other securities under the registration statement of which this Prospectus forms
a part will reduce the amount of Offered Securities that may be sold hereunder.
 
    The specific terms of the Offered Securities with respect to which this
Prospectus is being delivered will be set forth in an accompanying supplement to
this Prospectus (a "Prospectus Supplement"), together with the terms of the
offering of the Offered Securities and the initial price and the net proceeds to
the Company from the sale of the Offered Securities. The Prospectus Supplement
will also contain other applicable information about the Offered Securities such
as certain United States federal income tax considerations or any listing on a
securities exchange. This Prospectus may not be used to consummate sales of
Offered Securities unless accompanied by a Prospectus Supplement.
 
    For a description of certain terms that may relate to the Offered
Securities, see "Description of Debt Securities," "Description of Index
Warrants," "Description of Preferred Stock," "Description of Capital Stock" and
"Description of Depositary Shares" below.
 
    See "Description of Index Warrants--Special Considerations Relating to Index
Warrants" for a description of certain risks associated with an investment in
Index Warrants. In addition, prospective investors should see "European Monetary
Union" for a discussion of certain matters that may pertain to Offered
Securities and relate to the introduction of a single currency in Europe.
 
                                       3

                          USE OF PROCEEDS AND HEDGING
 
    GENERAL.  The proceeds to be received by the Company from the sale of the
Offered Securities will be used for general corporate purposes, principally to
fund the business of its operating units and to fund investments in, or
extensions of credit or capital contributions to, its subsidiaries and to
lengthen the average maturity of liabilities, which may include the reduction of
short-term liabilities or the refunding of maturing indebtedness. In order to
fund its business, the Company expects to incur additional indebtedness in the
future. The Company or an affiliate may enter into a swap agreement with one of
the Company's affiliates or a third party in connection with the sale of the
Offered Securities and may earn additional income as a result of payments
pursuant to such swap or related hedge transactions.
 
    USE OF PROCEEDS RELATING TO INDEX WARRANTS AND INDEXED NOTES.  All or a
portion of the proceeds to be received by the Company from the sale of Index
Warrants or Debt Securities on which certain or all payments of interest,
principal or premium may be linked to an index ("Indexed Notes") may be used by
the Company or one or more of its subsidiaries to purchase or maintain positions
in all or certain of the assets by reference to which the relevant index or
indices are determined or calculated ("Underlying Assets"), or options, futures
contracts, forward contracts or swaps, or options on the foregoing, or other
derivative or synthetic instruments relating to such Index or Underlying Assets,
as the case may be, and, if applicable, to pay the costs and expenses of hedging
any currency, interest rate or other index-related risk with respect to such
Index Warrants and Indexed Notes. From time to time after the initial offering
and prior to the maturity of the Index Warrants and Indexed Notes, depending on
market conditions (including the value of the index and/or the Underlying
Assets), in connection with hedging with respect to such Offered Securities, the
Company expects that it or one or more of its subsidiaries will increase or
decrease their initial hedging positions using dynamic hedging techniques and
may take long or short positions in the index, the Underlying Assets, options,
futures contracts, forward contracts, swaps, or other derivative or synthetic
instruments related to, the index and such Assets. In addition, the Company or
one or more of its subsidiaries may purchase or otherwise acquire a long or
short position in Index Warrants and Indexed Notes from time to time and may, in
their sole discretion, hold, resell, exercise, cancel or retire such Offered
Securities. The Company or one or more of its subsidiaries may also take hedging
positions in other types of appropriate financial instruments that may become
available in the future. To the extent that the Company or one or more of its
subsidiaries has a long hedge position in, options contracts in, or other
derivative or synthetic instruments related to, the Underlying Assets or index,
the Company or one or more of its subsidiaries may liquidate all or a portion of
its holdings at or about the time of the maturity of the Index Warrants and
Indexed Notes. Depending on, among other things, future market conditions, the
aggregate amount and composition of such positions are likely to vary over time.
Profits or losses from any such position cannot be ascertained until such
position is closed out and any offsetting position or positions are taken into
account. Although the Company has no reason to believe that its hedging activity
will have a material impact on the price of such options, swaps, futures
contracts, options on the foregoing, or other derivative or synthetic
instruments, or on the value of the index or the Underlying Assets, there can be
no assurance that the Company will not affect such prices or value as a result
of its hedging activities. The remainder of the proceeds from the sale of Index
Warrants and Indexed Notes will be used by the Company for general corporate
purposes, as described above.
 
                                       4

                      RATIO OF INCOME TO FIXED CHARGES AND
                   RATIO OF INCOME TO COMBINED FIXED CHARGES
                      INCLUDING PREFERRED STOCK DIVIDENDS
 
    The following table sets forth (i) the supplemental consolidated ratio of
income to fixed charges and (ii) the supplemental consolidated ratio of income
to combined fixed charges including preferred stock dividends of the Company for
the nine months ended September 30, 1998 and for each of the five most recent
fiscal years, after giving retroactive effect to the merger with Citicorp on
October 8, 1998 in a transaction accounted for as a pooling of interests.


                                                                                                   YEAR ENDED
                                                                                                  DECEMBER 31,
                                                              NINE MONTHS ENDED    ------------------------------------------
                                                             SEPTEMBER 30, 1998      1997       1996       1995       1994
                                                            ---------------------  ---------  ---------  ---------  ---------
                                                                                                     
Ratio of income to fixed charges (excluding interest on
  deposits)...............................................             1.65             1.71       1.88       1.65       1.41
Ratio of income to fixed charges (including interest on
  deposits)...............................................             1.39             1.43       1.51       1.39       1.25
Ratio of income to combined fixed charges including
  preferred stock dividends (excluding interest on
  deposits)...............................................             1.62             1.66       1.80       1.56       1.34
Ratio of income to combined fixed charges including
  preferred stock dividends (including interest on
  deposits)...............................................             1.37             1.41       1.48       1.35       1.21
 

 
                                                              1993
                                                            ---------
                                                         
Ratio of income to fixed charges (excluding interest on
  deposits)...............................................       1.43
Ratio of income to fixed charges (including interest on
  deposits)...............................................       1.25
Ratio of income to combined fixed charges including
  preferred stock dividends (excluding interest on
  deposits)...............................................       1.37
Ratio of income to combined fixed charges including
  preferred stock dividends (including interest on
  deposits)...............................................       1.22

 
                                       5

                            EUROPEAN MONETARY UNION
 
    Stage III of the European Economic and Monetary Union ("Stage III") is
presently scheduled to commence on January 1, 1999 for those member states of
the European Union that satisfy the economic convergence criteria set forth in
the Treaty on European Union. On March 25, 1998, the European Commission
officially recommended that eleven of the member states of the European Union be
allowed to participate in Stage III; these eleven member states are Austria,
Belgium, Finland, France, Germany, Ireland, Italy, Luxembourg, The Netherlands,
Portugal and Spain (collectively, the "Participating Member States"). It is
possible that additional member states of the European Union may participate in
Stage III after January 1, 1999, in which case each such additional member state
will also become a "Participating Member State." Certain of the foreign
currencies in which Debt Securities may be denominated or payments in respect of
Index Warrants may be due or by which amounts due on the Offered Securities may
be calculated may be issued by Participating Member States (each such country, a
"Relevant Jurisdiction" with respect to such Offered Securities). Stage III
includes the introduction of a single currency (the "Euro") which will be legal
tender in the Participating Member States, existing in parallel with the present
national currency of each Participating Member State. It is currently
anticipated that on and after January 1, 2002, the national currencies of
Participating Member States will cease to exist and the sole legal tender in
such States will be the Euro. It is anticipated that the European Union will
adopt regulations or other legislation providing specific rules for the
introduction of the Euro in substitution for the respective current national
currencies of such member states, which regulations or legislation may be
supplemented by legislation of the individual member states. The laws and
regulations of the European Union (and, if any, of such Relevant Jurisdiction)
relating to the Euro implemented pursuant to or by virtue of the Treaty on
European Union may apply to the relevant Offered Securities, Indenture (as
defined below) or Indentures and Index Warrant Agreement (as defined below) or
Agreements. Such laws and regulations, and future market conventions applicable
in the European Union to securities similar to the relevant Offered Securities,
may be inconsistent in varying degrees with the terms and conditions of the
relevant Offered Securities established at their issuance. To the extent that
references in any Indenture or Index Warrant Agreement governing any relevant
Offered Securities or in the terms and conditions of any relevant Offered
Securities to any business day, day-count, day-count fraction or other
convention shall be inconsistent with such European Union laws, regulations or
market conventions that are applicable to securities similar to the relevant
Offered Securities held in international clearing systems, the Company, in its
discretion (but after consultation with the applicable trustee or warrant agent,
and with any principal paying agent located in a European Union member state),
may amend such references and terms and conditions to be in harmony with, or to
otherwise comply with, such laws, regulations and/or market conventions. Any
such amendment shall be effected without the necessity of obtaining the consent
of any Holder of the relevant Offered Securities.
 
    If, following the commencement of Stage III, the Company has the option,
pursuant to applicable law, to make payments of principal of, or interest on or
any other amounts in respect of, the relevant Offered Securities, or to
calculate amounts due thereon, in either the current national currency of a
Relevant Jurisdiction or Euro, the Company will make such payments or
calculations in such national currency or Euro at its sole discretion. To the
extent that the introduction of the Euro necessitates the rounding up or down of
certain amounts or quotations expressed in Euro with respect to the relevant
Offered Securities, such rounding will be made in conformity with prevailing
market conventions in the European Union or, in the absence of an applicable
market convention, to the nearest Euro cent.
 
    The circumstances and consequences described in this section and any
resultant amendment to the terms and conditions of the relevant Offered
Securities will not entitle any Holder of such Offered Securities (i) to any
legal remedy, including, without limitation, redemption, rescission, notice,
repudiation, adjustment or renegotiation of the terms and conditions of the
Offered Securities, Indenture or Indentures and Index Warrant Agreement or
Agreements, or (ii) to raise any defense or make any claim (including, without
limitation, claims of breach, force majeure, frustration of purpose or
impracticability) or any other claim for compensation, damages or any other
relief.
 
                                       6

                         DESCRIPTION OF DEBT SECURITIES
 
    The Debt Securities will be unsecured general obligations of the Company.
The Debt Securities will constitute either senior or subordinated debt of the
Company and will be issued, in the case of Debt Securities that will be senior
debt, under a senior debt indenture (as amended or supplemented from time to
time, the "Senior Debt Indenture") and, in the case of Debt Securities that will
be subordinated debt, under a subordinated debt indenture (as amended or
supplemented from time to time, the "Subordinated Debt Indenture"). The Senior
Debt Indenture and the Subordinated Debt Indenture are sometimes hereinafter
referred to individually as an "Indenture" and collectively as the "Indentures."
The institutions named as trustees under the Indentures are hereinafter referred
to individually as a "Trustee" and collectively as the "Trustees." Forms of the
Indentures have been filed with the SEC and are incorporated by reference as
part of the Registration Statement on Form S-3 (No. 333-       ) under the
Securities Act of 1933, as amended (the "Securities Act"), that the Company has
filed with the SEC relating to the Offered Securities (such registration
statement, together with all exhibits and amendments, the "Registration
Statement"). The following summaries of certain provisions of the Indentures and
the Debt Securities do not purport to be complete and are subject to, and are
qualified by, the detailed provisions of the applicable Indenture, including the
definition of certain terms used and for other information regarding the Debt
Securities. Copies of the Indentures may be obtained from the Company or the
applicable Trustee. Numerical references in parentheses below are to sections in
the applicable Indenture or, if no Indenture is specified, to sections in each
of the Indentures. Wherever particular sections or defined terms of the
applicable Indenture are referred to, such sections or defined terms are
incorporated herein by reference as part of the statement made, and the
statement is qualified in its entirety by such reference.
 
    Unless otherwise provided in the applicable Prospectus Supplement, the
Trustee under the Senior Debt Indenture will be The Bank of New York, under an
Indenture dated as of March 15, 1987, as amended or supplemented from time to
time, and the Trustee under the Subordinated Debt Indenture will be The First
National Bank of Chicago under an Indenture dated as of July 17, 1998, as
amended or supplemented from time to time.
 
GENERAL
 
    The Debt Securities will be unsecured senior or subordinated obligations of
the Company. As a holding company, the Company's sources of funds are derived
principally from advances and dividends from subsidiaries, certain of which are
subject to regulatory considerations, and from sales of assets and investments.
The Indentures provide that the Debt Securities and other unsecured senior or
subordinated debt securities of the Company, without limitation as to aggregate
principal amount, may be issued in one or more series, and a single series may
be issued at various times, with different maturity dates and different interest
rates, in each case as authorized from time to time by the Company.
 
    One or more series of the Debt Securities may be issued with the same or
various maturities at par or at a discount. Federal income tax consequences and
other special considerations applicable to any Debt Securities issued by the
Company at a discount ("Original Issue Discount Securities") will be described
in the applicable Prospectus Supplement.
 
    Reference is made to the applicable Prospectus Supplement relating to any
series of Debt Securities for the following terms, where applicable:
 
 (1) the designation of the Debt Securities, whether such Debt Securities will
     be senior or subordinated debt of the Company and the Indenture under which
     such Debt Securities are being issued;
 
 (2) any limit on the aggregate principal amount of the Debt Securities;
 
 (3) the percentage of the principal amount representing the price at which the
     Debt Securities will be issued and, if applicable, the method by which such
     principal amount will be determined;
 
                                       7

 (4) the date or dates on which the principal of the Debt Securities will be
     payable;
 
 (5) the rate or rates per annum (which may be fixed or variable) at which the
     Debt Securities will bear interest, if any, or the method by which such
     rate or rates will be determined;
 
 (6) the date or dates from which any interest will accrue, or the method by
     which such date or dates will be determined, and the date or dates on which
     any such interest will be payable and any related record dates;
 
 (7) if other than in United States dollars, the currency or currency unit in
     which payment of principal of, premium, if any, and interest on the Debt
     Securities will be payable;
 
 (8) if the amount of payment of principal of, premium, if any, or any interest
     on the Debt Securities may be determined with reference to an index or
     formula based on a currency or currency unit other than that in which the
     Debt Securities are stated to be payable, the manner in which such amounts
     will be determined;
 
 (9) if the principal of, premium, if any, or any interest on the Debt
     Securities is to be payable at the election of the Company or a holder
     thereof in a currency or currency unit other than that in which the Debt
     Securities are stated to be payable, the periods within which and the terms
     upon which such election may be made;
 
(10) the place or places where the principal of, premium, if any, and any
     interest on the Debt Securities will be payable;
 
(11) the price or prices at which, the period or periods within which and the
     terms and conditions upon which the Debt Securities may be redeemed, in
     whole or in part, at the option of the Company;
 
(12) the obligation, if any, of the Company to redeem, purchase or repay the
     Debt Securities pursuant to any sinking fund or analogous provision or at
     the option of a holder thereof and the period or periods within which, the
     price or prices at which and the terms and conditions upon which the Debt
     Securities will be redeemed, purchased or repaid, in whole or in part,
     pursuant to such obligation;
 
(13) if other than the principal amount thereof, the portion of the principal
     amount of the Debt Securities payable upon declaration of acceleration of
     the maturity of the Debt Securities;
 
(14) provisions, if any, for the discharge of the Company's indebtedness and
     obligations or termination of certain of its obligations under the
     Indenture with respect to the Debt Securities by deposit of funds or United
     States government obligations;
 
(15) whether the Debt Securities are to be issued in whole or in part in the
     form of a Global Security (defined below) and the terms and conditions, if
     any, upon which such Global Security or Securities may be exchanged in
     whole or in part for other definitive Securities;
 
(16) the date as of which any Global Security will be dated if other than the
     original issuance of the first Debt Security to be issued;
 
(17) any material provisions of the applicable Indenture described in this
     Prospectus that do not apply to the Debt Securities; and
 
(18) any other terms of the Debt Securities not inconsistent with the provisions
     of the Indentures (SECTION 2.02).
 
    The terms on which a series of Debt Securities may be convertible into or
exchangeable for Common Stock or other securities of the Company will be set
forth in the Prospectus Supplement relating thereto. Such terms will include
provisions as to whether conversion or exchange is mandatory,
 
                                       8

at the option of the holder or at the option of the Company, and may include
provisions pursuant to which the number of shares of Common Stock or other
securities of the Company to be received by the holders of such series of Debt
Securities would be subject to adjustment.
 
    Under the Indentures, the Company may authorize the issuance and establish
the terms of a series of Debt Securities pursuant to a supplemental indenture or
pursuant to a resolution of its Board of Directors, any duly authorized
committee of the Board or any committee of officers or other representatives of
the Company duly authorized by the Board of Directors for such purpose. The
provisions of the Indentures described above provide the Company with the
ability, in addition to the ability to issue Debt Securities with terms
different from those of Debt Securities previously issued, to "reopen" a
previous issue of a series of Debt Securities and to issue additional Debt
Securities of such series.
 
    The Debt Securities will be issued only in registered form. Debt Securities
of a series may be issuable in the form of one or more Global Securities, as
described below under "Global Securities." Unless otherwise provided in the
Prospectus Supplement accompanying this Prospectus, Debt Securities denominated
in United States dollars will be issued only in denominations of $1,000 and
integral multiples thereof (SECTION 2.01). The Prospectus Supplement relating to
Offered Securities denominated in a foreign or composite currency will specify
the denomination thereof.
 
    The Debt Securities may be presented for exchange, and Debt Securities
(other than a Global Security) may be presented for registration of transfer at
the principal corporate trust office of the Trustee in The City of New York. No
service charge will be made for any registration of transfer or exchange of Debt
Securities, but the Company may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith. All Debt
Securities presented for registration of transfer or exchange shall (if so
required by the Company or the Trustee) be duly endorsed by, or accompanied by a
written instrument or instruments of transfer (in form satisfactory to the
Company and the Trustee) duly executed by, the registered holder or his attorney
duly authorized in writing (SECTION 2.05).
 
PAYMENT AND PAYING AGENTS
 
    Payment of principal of and premium, if any, on the Debt Securities (other
than a Global Security) will be made in the designated currency against
surrender of such Debt Securities at the principal corporate trust office of the
Trustee in The City of New York. Unless otherwise indicated in the Prospectus
Supplement, payment of any installment of interest on Securities will be made to
the person in whose name such Security is registered at the close of business on
the Record Date for such interest. Unless otherwise indicated in the Prospectus
Supplement, payments of such interest will be made at the principal corporate
trust office of the Trustee in The City of New York, or by a check mailed to the
holder at such holder's registered address (SECTIONS 2.01 AND 5.02).
 
GLOBAL SECURITIES
 
    The Debt Securities of a series may be issued in whole or in part in the
form of one or more Global Securities that will be deposited with, or on behalf
of, a depository identified in the Prospectus Supplement relating to such series
(SENIOR DEBT INDENTURE, SECTIONS 1.02 AND 2.01; SUBORDINATED DEBT INDENTURE,
SECTIONS 1.02 AND 2.02).
 
    The specific terms of the depository arrangement with respect to a series of
Debt Securities will be described in the Prospectus Supplement relating to such
series. Unless otherwise indicated in any accompanying Prospectus Supplement,
the following provisions will apply to any depository arrangements.
 
    Global Securities will be deposited with, or on behalf of, The Depository
Trust Company ("DTC") and registered in the name of DTC or its nominee. Except
as set forth below or in an accompanying
 
                                       9

Prospectus Supplement, Global Securities may not be transferred except as a
whole by DTC to a nominee of DTC or by a nominee of DTC to DTC or another
nominee of DTC or by DTC or any nominee to a successor of DTC or a nominee of
such successor.
 
    DTC has advised the Company that it is a limited-purpose trust company
organized under the laws of the State of New York, a member of the Federal
Reserve System, a "clearing corporation" within the meaning of the New York
Uniform Commercial Code and a "clearing agency" registered pursuant to the
provisions of Section 17A of the Exchange Act. DTC was created to hold
securities for persons that have accounts with DTC ("participants") and to
facilitate the clearance and settlement of securities transactions among its
participants in such securities through electronic book-entry changes in
accounts of the participants, thereby eliminating the need for physical movement
of certificates. DTC's participants include securities brokers and dealers,
banks, trust companies, clearing corporations and certain other organizations,
some of which (and/or their representatives) own DTC. Access to DTC's book-entry
system is also available to others, such as banks, brokers, dealers and trust
companies that clear through or maintain a custodial relationship with a
participant, either directly or indirectly. Persons who are not participants may
beneficially own interests in securities held by DTC only through participants.
 
    Upon the issuance by the Company of a Global Security, DTC will credit, on
its book-entry registration and transfer system, the respective principal
amounts of the securities represented by such Global Security to the accounts of
participants. Ownership of beneficial interests in a Global Security will be
limited to participants or persons that may hold interests through participants.
Ownership of beneficial interests in Global Securities will be shown on, and the
transfer of such interests will be effected only through, records maintained by
DTC or its nominee (with respect to beneficial interests of participants) or by
participants or persons that may hold interests through participants (with
respect to beneficial interests of indirect participants). The laws of some
states may require that certain purchasers of securities take physical delivery
of such securities in certificated form. Such limits and such laws may impair
the ability to transfer beneficial interests in Global Securities.
 
    So long as DTC or its nominee is the registered owner of the Global
Securities, DTC or its nominee, as the case may be, will be considered the sole
owner or holder of the securities represented by such Global Securities for all
purposes under the Indenture. Except as provided in an accompanying Prospectus
Supplement, owners of beneficial interests in Global Securities will not be
entitled to have securities represented by such Global Securities registered in
their names, will not receive or be entitled to receive physical delivery of
such securities in certificated form and will not be considered the owners or
holders thereof under the Indenture.
 
SENIOR DEBT
 
    The Debt Securities that will constitute part of the senior debt of the
Company (the "Senior Debt Securities") will be issued under the Senior Debt
Indenture and will rank PARI PASSU with all other unsecured debt of the Company
except subordinated debt.
 
    Because the Company is a holding company, its rights and the rights of its
creditors, including the holders of Senior Debt Securities, to participate in
the assets of any subsidiary upon the latter's liquidation or recapitalization
will be subject to the prior claims of the subsidiary's creditors, except to the
extent that the Company may itself be a creditor with recognized claims against
the subsidiary.
 
SUBORDINATED DEBT
 
    The Debt Securities that will constitute part of the subordinated debt of
the Company ("Subordinated Debt Securities") will be issued under the
Subordinated Debt Indenture and will rank subordinated and junior in right of
payment, to the extent set forth in the Subordinated Debt Indenture, to all
"Senior Indebtedness" (as defined below) of the Company.
 
                                       10

    If the Company shall default in the payment of any principal of, or premium,
if any, or interest on any Senior Indebtedness when the same becomes due and
payable after any applicable grace period, whether at maturity or at a date
fixed for prepayment or by declaration or otherwise, then, unless and until such
default shall have been cured or waived or shall have ceased to exist, no direct
or indirect payment (in cash, property, securities, by set-off or otherwise)
shall be made or agreed to be made on account of the principal of, or premium,
if any, or interest on Subordinated Debt Securities, or in respect of any
redemption, retirement or other acquisition of any of the Subordinated Debt
Securities, except that holders of Subordinated Debt Securities may receive and
retain (i) securities of the Company or any other corporation provided for by a
plan of reorganization or readjustment the payment of which is subordinate, at
least to the extent provided in the Subordinated Debt Indenture with respect to
the indebtedness evidenced by the Subordinated Debt Securities, to the payment
of all Senior Indebtedness at the time outstanding and to any securities issued
in respect thereof under any plan of reorganization or readjustment
("Reorganization Securities") and (ii) payments made from a defeasance trust as
set forth below. In the event of (a) any insolvency, bankruptcy, receivership,
liquidation, reorganization, readjustment, composition or other similar
proceeding relating to the Company, its creditors or its property, (b) any
proceeding for the liquidation, dissolution or other winding-up of the Company,
voluntary or involuntary, whether or not involving insolvency or bankruptcy
proceedings, (c) any assignment by the Company for the benefit of creditors or
(d) any other marshalling of the assets of the Company, all Senior Indebtedness
(including any interest thereon accruing after the commencement of any such
proceedings) shall first be paid in full before any payment or distribution,
whether in cash, securities or other property, shall be made to any holders of
Subordinated Debt Securities (except as permitted by the next succeeding
sentence). In such event, any payment or distribution under Subordinated Debt
Securities, whether in cash, securities or other property (other than (i)
Reorganization Securities and (ii) payments made from a defeasance trust created
pursuant to the Indenture), which would otherwise (but for the subordination
provisions) be payable or deliverable in respect of Subordinated Debt
Securities, shall be paid or delivered directly to the holders of Senior
Indebtedness in accordance with the priorities then existing among such holders
until all Senior Indebtedness (including any interest thereon accruing after the
commencement of any such proceedings) shall have been paid in full. If,
notwithstanding the foregoing, any payment or distribution under Subordinated
Debt Securities of any character, whether in cash, securities or other property
(other than (i) Reorganization Securities and (ii) payments made from a
defeasance trust created pursuant to the Subordinated Debt Indenture), shall be
received by the Trustee or any holder of any Subordinated Debt Securities in
contravention of any of the terms of the Subordinated Debt Indenture, such
payment or distribution or security shall be received in trust for the benefit
of, and shall be paid over or delivered and transferred to, the holders of the
Senior Indebtedness at the time outstanding in accordance with the priorities
then existing among such holders until all Senior Indebtedness (including any
interest thereon accruing after the commencement of any such proceedings) shall
have been paid in full (SUBORDINATED DEBT INDENTURE, SECTION 14.01).
 
    "Senior Indebtedness" means (i) the principal, premium, if any, and interest
in respect of (A) indebtedness of the Company for money borrowed and (B)
indebtedness evidenced by securities, notes, debentures, bonds or other similar
instruments issued by the Company, including the Senior Debt Securities; (ii)
all capital lease obligations of the Company; (iii) all obligations of the
Company issued or assumed as the deferred purchase price of property, all
conditional sale obligations of the Company and all obligations of the Company
under any conditional sale or title retention agreement (but excluding trade
accounts payable in the ordinary course of business); (iv) all obligations,
contingent or otherwise, of the Company in respect of any letters of credit,
bankers acceptance, security purchase facilities and similar credit
transactions; (v) all obligations of the Company in respect of interest rate
swap, cap or other agreements, interest rate future or options contracts,
currency swap agreements, currency future or option contracts and other similar
agreements; (vi) all obligations of the type referred to in clauses (i) through
(v) of other persons for the payment of which the Company is
 
                                       11

responsible or liable as obligor, guarantor or otherwise; and (vii) all
obligations of the type referred to in clauses (i) through (vi) of other persons
secured by any lien on any property or asset of the Company (whether or not such
obligation is assumed by the Company), except for (1) Subordinated Debt
Securities, (2) any such indebtedness that is by its terms subordinated to or
PARI PASSU with Subordinated Debt Securities and (3) any indebtedness between or
among the Company and its affiliates, including (x) any Junior Subordinated
Debt, (y) any Capital Securities Guarantees and (z) all other debt securities
and guarantees in respect of those debt securities issued to any other trust, or
a trustee of such trust, partnership or other entity affiliated with the Company
which is a financing vehicle of the Company (a "Financing Entity") in connection
with the issuance by such Financing Entity of preferred securities or other
securities guaranteed by the Company pursuant to an instrument that ranks PARI
PASSU with, or junior to, the Capital Securities Guarantees.
 
    "Junior Subordinated Debt" means the 7% Junior Subordinated Deferrable
Interest Debentures due November 15, 2028 of the Company, the 6.850% Junior
Subordinated Deferrable Interest Debentures due January 22, 2038 of the Company,
the 7 5/8% Junior Subordinated Deferrable Interest Debentures due December 1,
2036 of the Company, the 7 3/4% Junior Subordinated Deferrable Interest
Debentures due December 1, 2036 of the Company, the 8% Deferrable Interest
Debentures due September 30, 2036 of the Company, all other notes or other
obligations which may be issued under the Indenture, dated as of October 7,
1996, between the Company and The Chase Manhattan Bank, as trustee, and any
indebtedness that is by its terms subordinated to or PARI PASSU with the Junior
Subordinated Debt.
 
    "Capital Securities Guarantees" means the guarantees issued by the Company
in connection with the 7% Trust Preferred Securities of Citigroup Capital V, the
6.850% Trust Preferred Securities of Citigroup Capital IV, the 7 5/8% Trust
Preferred Securities of Citigroup Capital III, the 7 3/4% Trust Preferred
Securities of Citigroup Capital II, the 8% Trust Preferred Securities of
Citigroup Capital I, and any guarantee now or hereafter entered into by the
Company in respect of any preferred or preference stock (including capital
securities) that is by its terms subordinated to or PARI PASSU with the Junior
Subordinated Debt.
 
    Because the Company is a holding company, its rights and the rights of its
creditors, including the holders of Subordinated Debt Securities, to participate
in the assets of any subsidiary upon the latter's liquidation or
recapitalization will be subject to the prior claims of the subsidiary's
creditors, except to the extent that the Company may itself be a creditor with
recognized claims against the subsidiary.
 
COVENANTS
 
    LIMITATIONS ON LIENS.  The Senior Debt Indenture provides that the Company
will not, and will not permit any Subsidiary to, incur, issue, assume or
guarantee any indebtedness for money borrowed if such indebtedness is secured by
a pledge of, lien on, or security interest in any shares of Voting Stock of any
Significant Subsidiary (as defined below), whether such Voting Stock is now
owned or is hereafter acquired, without providing that each series of Debt
Securities issued under the Senior Debt Indenture (together with, if the Company
shall so determine, any other indebtedness or obligations of the Company or any
Subsidiary ranking equally with such Debt Securities and then existing or
thereafter created) shall be secured equally and ratably with such indebtedness.
The foregoing limitation shall not apply to indebtedness secured by a pledge of,
lien on or security interest in any shares of Voting Stock of any corporation at
the time it becomes a Significant Subsidiary (SENIOR DEBT INDENTURE, SECTION
5.04). The Subordinated Debt Indenture does not contain a similar provision.
 
    "Significant Subsidiary" means a Subsidiary, including its Subsidiaries,
which meets any of the following conditions: (i) the Company's and its other
Subsidiaries' investments in and advances to the Subsidiary exceed 10 percent of
the total assets of the Company and its Subsidiaries consolidated as of the end
of the most recently completed fiscal year; (ii) the Company's and its other
Subsidiaries'
 
                                       12

proportionate share of the total assets (after intercompany eliminations) of the
Subsidiary exceeds 10 percent of the total assets of the Company and its
Subsidiaries consolidated as of the end of the most recently completed fiscal
year; or (iii) the Company's and its other Subsidiaries' equity in the income
from continuing operations before income taxes, extraordinary items and
cumulative effect of a change in accounting principles of the Subsidiary exceeds
10 percent of such income of the Company and its Subsidiaries consolidated for
the most recently completed fiscal year.
 
    "Subsidiary" means any corporation of which securities entitled to elect at
least a majority of the corporation's directors shall at the time be owned,
directly or indirectly, by the Company, or one or more Subsidiaries, or by the
Company and one or more Subsidiaries.
 
    "Voting Stock" means capital stock the holders of which have general voting
power under ordinary circumstances to elect at least a majority of the board of
directors of a corporation, provided that, for the purposes of such definition,
capital stock which carries only the right to vote conditioned on the happening
of an event shall not be considered voting stock whether or not such event shall
have happened (SENIOR DEBT INDENTURE, SECTIONS 1.02 AND 5.04).
 
    LIMITATIONS ON MERGERS AND SALES OF ASSETS.  In each of the Senior Debt
Indenture and the Subordinated Debt Indenture, the Company has agreed that it
will not enter into a merger or consolidation with another corporation or sell
other than for cash or lease all or substantially all its assets to another
corporation, or purchase all or substantially all the assets of another
corporation unless (i) either the Company is the continuing corporation, or the
successor corporation (if other than the Company) expressly assumes by
supplemental indenture the obligations evidenced by the securities issued
pursuant to the Indenture (in which case, except in the case of such a lease,
the Company will be discharged therefrom) and (ii) immediately thereafter, the
Company or the successor corporation (if other than the Company) would not be in
default in the performance of any covenant or condition of the Indenture (SENIOR
DEBT INDENTURE, SECTIONS 5.05 AND 14.01; SUBORDINATED DEBT INDENTURE, SECTIONS
5.04 AND 15.01).
 
    Except to the extent described above, the Indentures do not contain any
covenants or provisions that would afford protection to holders of the Debt
Securities in the event of a highly leveraged transaction.
 
MODIFICATION OF THE INDENTURES
 
    The Indentures contain provisions permitting the Company and the Trustee,
without the consent of the holders of the Debt Securities, to establish, among
other things, the form and terms of any series of securities issuable thereunder
by one or more supplemental indentures, and, with the consent of the holders of
not less than 66 2/3% in aggregate principal amount of the Senior Debt
Securities at the time outstanding which are affected thereby or a majority in
aggregate principal amount of the Subordinated Debt Securities (at the time
outstanding) which are affected thereby, to modify the applicable Indenture or
any supplemental indenture or the rights of the holders of the securities of
such series to be affected, provided that no such modification will, without the
consent of the holder of each Debt Security affected thereby, (i) extend the
fixed maturity of any such securities, reduce the rate or extend the time of
payment of interest thereon, reduce the principal amount thereof or the premium,
if any, thereon, reduce the amount of the principal of Original Issue Discount
Securities payable on any date, change the currency in which any such securities
are payable, or impair the right to institute suit for the enforcement of any
such payment on or after the maturity thereof, without the consent of the holder
of each security so affected, or (ii) reduce the aforesaid percentage of
securities of any series the consent of the holders of which is required for any
such modification without the consent of the holders of all securities of such
series then outstanding, or (iii) modify, without the written consent of the
Trustee, the rights, duties or immunities of the Trustee (SECTIONS 13.01 AND
13.02).
 
                                       13

    In addition, the Subordinated Debt Indenture may not be amended without the
consent of each holder of Subordinated Debt Securities affected thereby to
modify the subordination of the Subordinated Debt Securities issued thereunder
in a manner adverse to the holders of the Subordinated Debt Securities.
(SUBORDINATED DEBT INDENTURE, SECTION 13.02).
 
DEFAULTS
 
    Each Indenture provides that events of default with respect to any series of
Debt Securities will be (i) default for 30 days in payment of interest upon any
Debt Security of such series; (ii) default in payment of principal (other than a
sinking fund installment) or premium, if any, on any Debt Security of such
series; (iii) default for 30 days in payment of any sinking fund installment
when due by the terms of the Debt Securities of such series; (iv) default, for
90 days after notice, in performance of any other covenant in the relevant
Indenture (other than a covenant included in the relevant Indenture solely for
the benefit of a series of Debt Securities other than such series); and (v)
certain events of bankruptcy or insolvency (SECTION 6.01). If an event of
default with respect to Debt Securities of any series issued under the
Indentures should occur and be continuing, either the Trustee or the holders of
25% in the principal amount of outstanding Debt Securities of such series may
declare each Debt Security of that series due and payable (SECTION 6.02). The
Company is required to file annually with the Trustee a statement of an officer
as to the fulfillment by the Company of its obligations under the Indenture
during the preceding year (SENIOR DEBT INDENTURE, SECTION 5.06; SUBORDINATED
DEBT INDENTURE, SECTION 5.05).
 
    No event of default with respect to a single series of Debt Securities
issued under an Indenture (and any supplemental indenture) necessarily
constitutes an event of default with respect to any other series of Debt
Securities (SECTION 6.02).
 
    Holders of a majority in principal amount of the outstanding Debt Securities
of any series will be entitled to control certain actions of the Trustee under
the Indentures and to waive past defaults with respect to such series (SECTIONS
6.02 AND 6.06). Subject to the provisions of the Indentures relating to the
duties of the Trustee, the Trustee will not be under any obligation to exercise
any of the rights or powers vested in it by the respective Indentures at the
request, order or direction of any of the holders of Debt Securities, unless one
or more of such holders of Debt Securities shall have offered to the Trustee
reasonable security or indemnity (SECTION 10.01).
 
    If an event of default occurs and is continuing with respect to a series of
Debt Securities, any sums held or received by the Trustee under the relevant
Indenture may be applied to reimburse the Trustee for its reasonable
compensation and expenses incurred prior to any payments to holders of Debt
Securities of such series (SECTION 6.05).
 
    The right of any holder of any series of Debt Securities to institute action
for any remedy (except such holder's right to enforce payment of the principal
of, premium, if any, and interest on such holder's Debt Security when due) will
be subject to certain conditions precedent, including a request to the Trustee
by the holders of not less than 25% in principal amount of the Debt Securities
of that series outstanding to take action, and an offer satisfactory to the
Trustee of security and indemnity against liabilities incurred by it in so doing
(SECTION 6.07).
 
DEFEASANCE
 
    SENIOR DEBT INDENTURE.  The Senior Debt Indenture provides that, if so
specified with respect to the Senior Debt Securities of a particular series, the
Company (a) will be deemed to have paid and discharged the entire indebtedness
on all outstanding Senior Debt Securities of such series ("defeasance and
discharge") or (b) will cease to be under any obligation (other than to pay when
due the principal of, premium, if any, and interest on such Senior Debt
Securities) with respect to the Senior
 
                                       14

Debt Securities of such series ("covenant defeasance"), at any time prior to
Maturity, when the Company has deposited with the Trustee, in trust for the
benefit of the holders (i) funds sufficient to pay all sums due for principal
of, premium, if any, and interest on the Senior Debt Securities of such series
as they shall become due from time to time, or (ii) such amount of direct
obligations of, or obligations the payment of which are unconditionally
guaranteed by the full faith and credit of, the United States of America, as
will or will together with the income thereon without consideration of any
reinvestment thereof be sufficient to pay all sums due for principal of,
premium, if any, and interest on the Senior Debt Securities of such series as
they shall become due from time to time. In addition to the foregoing, covenant
defeasance, but not defeasance and discharge, is conditioned upon the Company's
delivery to the Trustee of an opinion of counsel to the effect that the holders
of the Senior Debt Securities of such series will have no federal income tax
consequences as a result of such deposit. Upon defeasance and discharge, the
Senior Debt Indenture will cease to be of further effect with respect to the
Senior Debt Securities of such series and the holders of such Senior Debt
Securities shall look only to the deposited funds or obligations for payment.
Upon covenant defeasance, however, the Company will not be relieved of its
obligation to pay when due principal of, premium, if any, and interest on the
Senior Debt Securities of such series if not otherwise paid from such deposited
funds or obligations. Notwithstanding the foregoing, certain obligations and
rights under the Senior Debt Indenture with respect to compensation,
reimbursement and indemnification of the Trustee, optional redemption, mandatory
and optional sinking fund payments, if any, registration of transfer and
exchange of the Senior Debt Securities of such series, replacement of mutilated,
destroyed, lost or stolen Senior Debt Securities and certain other
administrative provisions will survive defeasance and discharge and covenant
defeasance (SENIOR DEBT INDENTURE, SECTIONS 11.03 AND 11.04).
 
    Under current federal income tax law, the defeasance and discharge
contemplated in the preceding paragraph would be treated as a taxable exchange
of the Senior Debt Securities for an interest in the trust. As a consequence,
each holder of the Senior Debt Securities would recognize gain or loss equal to
the difference between the value of the holder's interest in the trust and
holder's tax basis for the Senior Debt Securities deemed exchanged. Thereafter,
each holder would be required to include in income his share of any income, gain
and loss recognized by the trust. Although a holder would be subject to federal
income tax on the deemed exchange of the defeased Senior Debt Securities for an
interest in the trust, such holder would not receive any cash until the maturity
(or an earlier redemption) of such Senior Debt Securities (except for current
interest payments, if any). Under current federal income tax law, a covenant
defeasance would not be treated as a taxable exchange of Senior Debt Securities.
Prospective investors are urged to consult their own tax advisors as to the
specific consequences of a defeasance and discharge, including the applicability
and effect of tax laws other than the federal income tax law.
 
    SUBORDINATED DEBT INDENTURE.  The Company may discharge all of its
obligations (except those set forth in the Subordinated Debt Indenture) to
holders of Subordinated Debt Securities of a particular series, which
Subordinated Debt Securities have not already been delivered to the Trustee for
cancellation and which either have become due and payable or are by their terms
due and payable within one year (or are to be called for redemption within one
year), by depositing with the Trustee an amount certified to be sufficient to
pay when due the principal of (and premium, if any) and interest, if any, on all
outstanding Subordinated Debt Securities of such series and to make any
mandatory sinking fund payments thereon when due (SUBORDINATED DEBT INDENTURE,
SECTION 11.01).
 
    The Company, at its option, (i) will be released from its obligations in
respect of the Subordinated Debt Securities of such series (except for certain
obligations to register the transfer or exchange of Subordinated Debt Securities
and to replace mutilated, defaced, destroyed, lost or stolen Subordinated Debt
Securities)("defeasance and discharge") or (ii) need not comply with certain
covenants with respect to the Subordinated Debt Securities, and the occurrence
of an event described under Events of Default with respect to any defeased
covenant and any such omission shall no longer be an Event of
 
                                       15

Default ("covenant defeasance" and together with defeasance and discharge, a
"defeasance") if, in either case, the Company irrevocably deposits with the
Trustee, in trust, cash or U.S. Government Obligations (or a combination
thereof) that, through the payment of interest thereon and principal thereof in
accordance with their terms will provide funds in an amount sufficient to pay
and discharge all the principal of (and premium, if any) and any interest on the
Subordinated Debt Securities of such series on the dates such payments are due
in accordance with the terms of the Subordinated Debt Securities. Such a trust
may only be established if, among other things, the Company shall have delivered
an opinion of counsel (which, in the case of a defeasance and discharge, must be
based upon a ruling or administrative pronouncement of the IRS) to the effect
that the holders of the Subordinated Debt Securities will not recognize income,
gain or loss for federal income tax purposes as a result of such deposit and
defeasance and discharge or covenant defeasance and they will be subject to
federal income tax in the same manner as if such defeasance and discharge had
not occurred. In the event the Company omits to comply with its remaining
obligations under the Indenture after a covenant defeasance with respect to a
particular series of Subordinated Debt Securities and such Subordinated Debt
Securities are declared due and payable because of the occurrence of any
undefeased Event of Default, the amount of money and U.S. Government Obligations
on deposit with the Trustee may be insufficient to pay amounts due on the
Subordinated Debt Securities at the time of the acceleration resulting from such
Event of Default. However, the Company will remain liable in respect of such
payments (SUBORDINATED DEBT INDENTURE, SECTIONS 11.02, 11.03, 11.04 AND 11.05).
 
CONCERNING THE TRUSTEES
 
    The Company has had and may in the future from time to time have, banking
relationships with the Trustees in the ordinary course of business.
 
                                       16

                         DESCRIPTION OF INDEX WARRANTS
 
    The following description of the terms of the Index Warrants sets forth
certain general terms and provisions of the Index Warrants to which any
Prospectus Supplement may relate. The particular terms of the Index Warrants
offered by any Prospectus Supplement and the extent, if any, to which such
general provisions do not apply to the Index Warrants so offered will be
described in such Prospectus Supplement.
 
    Index Warrants may be issued independently or together with Debt Securities
offered by any Prospectus Supplement and may be attached to or separate from any
such Offered Securities. Each series of Index Warrants will be issued under a
separate index warrant agreement (each, an "Index Warrant Agreement") to be
entered into between the Company and a bank or trust company, as warrant agent
(the "Index Warrant Agent"), all as described in the Prospectus Supplement
relating to such Index Warrants. A single bank or trust company may act as Index
Warrant Agent for more than one series of Index Warrants. The Index Warrant
Agent will act solely as the agent of the Company under the applicable Index
Warrant Agreement and will not assume any obligation or relationship of agency
or trust for or with any owners of such Index Warrants. A copy of the form of
Index Warrant Agreement, including the form of index warrant certificate (the
"Index Warrant Certificate," or, if issued in global form, the "Index Warrant
Global Certificate"), is filed as an exhibit to or incorporated by reference in
the Registration Statement. The following summaries of certain provisions of the
Index Warrants and the form of Index Warrant Agreement do not purport to be
complete and are subject to, and are qualified in their entirety by reference
to, all of the provisions of the Index Warrant Agreement and the Index Warrant
Certificate or Index Warrant Global Certificate.
 
GENERAL
 
    The Index Warrant Agreement does not limit the number of Index Warrants that
may be issued thereunder. The Company will have the right to "reopen" a previous
series of Index Warrants and to issue additional Index Warrants of such series.
 
    Each Index Warrant will entitle the holder (each, a "Warrant Holder") to
receive from the Company, upon exercise, including any automatic exercise, an
amount in cash or a number of securities that will be determined by reference to
an index calculated by reference to prices, yields, levels or other specified
objective measures in respect of specified securities or securities indices or
specified foreign currencies or currency indices, or a combination thereof, or
changes in such measure or differences between two or more such measures. The
Prospectus Supplement for a series of Index Warrants will set forth the formula
or methodology pursuant to which the amount payable or distributable on the
Index Warrants will be determined by reference to the relevant index or indices.
 
    Certain Index Warrants will, if specified in the Prospectus Supplement,
entitle the Warrant Holder to receive from the Company, upon automatic exercise
at expiration and under certain other circumstances, a minimum or maximum
amount.
 
    The Prospectus Supplement applicable to any series of Index Warrants will
set forth any circumstances in which the payment or distribution or the
determination of the payment or distribution on the Index Warrants may be
postponed and the period for which such payment or distribution or determination
may be postponed. Conversely, the Index Warrants may be subject to early
exercise or cancellation in certain circumstances described in the applicable
Prospectus Supplement. The amount due, or the means by which the amount due, on
the Index Warrants may be determined after any such delay or postponement, or
early exercise or cancellation will be set forth in the applicable Prospectus
Supplement.
 
    Unless otherwise specified in the applicable Prospectus Supplement, the
Company will be under no obligation to, nor will it, purchase or take delivery
of or sell or deliver any securities or currencies
 
                                       17

(including the Underlying Assets (defined below)), other than the payment of any
cash or distribution of any securities due on the Index Warrants, from or to
Warrant Holders pursuant to the Index Warrants.
 
    Unless otherwise specified in the applicable Prospectus Supplement, the
Index Warrants will be deemed to be automatically exercised upon expiration.
Upon such automatic exercise, Warrant Holders will be entitled to receive the
cash amount or number of securities due, if any, on such exercise of the Index
Warrants.
 
    Reference is hereby made to the Prospectus Supplement relating to the
particular series of Index Warrants offered thereby for the terms of such Index
Warrants, including, where applicable: (i) the aggregate number of such Index
Warrants; (ii) the offering price of such Index Warrants; (iii) the measure or
measures by reference to which payment or distribution on such Index Warrants
will be determined; (iv) certain information regarding the underlying
securities, foreign currencies or indices; (v) the amount of cash or number of
securities due, or the means by which the amount of cash or number of securities
due may be calculated, on exercise of the Index Warrants, including automatic
exercise, or upon cancellation; (vi) the date on which the Index Warrants may
first be exercised and the date on which they expire; (vii) any minimum number
of Index Warrants exercisable at any one time; (viii) any maximum number of
Index Warrants that may, subject to the Company's election, be exercised by all
Warrant Holders (or by any person or entity) on any day; (ix) any provisions
permitting a Warrant Holder to condition an exercise of Index Warrants; (x) the
method by which the Index Warrants may be exercised; (xi) the currency in which
the Index Warrants will be denominated and in which payments on the Index
Warrants will be made or the Securities that may be distributed in respect of
the Index Warrants; (xii) the method of making any foreign currency translation
applicable to payments or distributions on the Index Warrants; (xiii) the method
of providing for a substitute index or indices or otherwise determining the
amount payable in connection with the exercise of Index Warrants if an index
changes or is no longer available; (xiv) the time or times at which amounts will
be payable or distributable in respect of such Index Warrants following exercise
or automatic exercise; (xv) any national securities exchange on, or
self-regulatory organization with which, such Index Warrants will be listed;
(xvi) any provisions for issuing such Index Warrants in certificated form;
(xvii) if such Index Warrants are not issued in book-entry form, the place or
places at and the procedures by which payments or distributions on the Index
Warrants will be made; and (xviii) any other terms of such Index Warrants.
 
    Prospective purchasers of Index Warrants should be aware of special United
States federal income tax considerations applicable to instruments such as the
Index Warrants. The Prospectus Supplement relating to each series of Index
Warrants will describe such tax considerations. The summary of United States
federal income tax considerations contained in the Prospectus Supplement will be
presented for informational purposes only, however, and will not be intended as
legal or tax advice to prospective purchasers. Prospective purchasers of Index
Warrants are urged to consult their own tax advisors prior to any acquisition of
Index Warrants.
 
BOOK-ENTRY PROCEDURES AND SETTLEMENT FOR INDEX WARRANTS
 
    Subject to the rules of the Warrant Depositary (as defined below) and unless
otherwise specified in the Prospectus Supplement, the Index Warrants offered
thereby will be issued in the form of a single Index Warrant Global Certificate
that will be deposited with, or on behalf of, a depositary, The Depository Trust
Company ("DTC"), New York, New York ("Warrant Depositary") and registered in the
name of the Warrant Depositary or its nominee. Unless and until it is exchanged
in whole or in part for the individual Index Warrants represented thereby, an
Index Warrant Global Certificate may not be transferred except as a whole by the
Warrant Depositary to a nominee of the Warrant Depositary or by a nominee of the
Warrant Depositary to the Warrant Depositary or another nominee of the Warrant
 
                                       18

Depositary or by the Warrant Depositary or any such nominee to a successor of
the Warrant Depositary or a nominee of such successor.
 
    The Company anticipates that the following provisions will apply to all
depository arrangements.
 
    Upon the issuance of an Index Warrant Global Certificate, the Warrant
Depositary will credit, on its book-entry registration and transfer system, the
respective numbers of the individual Index Warrants represented by such Index
Warrant Global Certificate to the accounts of participants. The accounts to be
credited shall be designated by the underwriters of such Index Warrants or, if
such Index Warrants are offered and sold directly by the Company or through one
or more agents, by the Company or such agent or agents. Ownership of beneficial
interests in an Index Warrant Global Certificate will be limited to participants
or persons that may hold beneficial interests through participants. Ownership of
beneficial interests in an Index Warrant Global Certificate will be shown on,
and the transfer of that ownership will be effected only through, records
maintained by the Warrant Depositary or its nominee (with respect to beneficial
interests of participants) or by participants or persons that may hold interests
through participants (with respect to beneficial interests of indirect
participants). The laws of some states require that certain purchasers of
securities take physical delivery of such securities in certificated form. Such
limits and such laws may impair the ability to transfer beneficial interests in
an Index Warrant Global Certificate.
 
    So long as the Warrant Depositary or its nominee is the registered owner of
an Index Warrant Global Certificate, the Warrant Depositary or its nominee, as
the case may be, will be considered the sole owner or holder of the Index
Warrants for all purposes under the related Index Warrant Agreement. Except as
set forth below, owners of beneficial interests in the Index Warrant Global
Certificate will not be entitled to have any of the individual Index Warrants
represented by such Index Warrant Global Certificate registered in their names,
will not receive or be entitled to receive physical delivery of any such Index
Warrants in certificated form, and will not be considered the holders thereof
under the related Index Warrant Agreement.
 
    Neither the Company nor the Index Warrant Agent will have any responsibility
or liability for any aspect of the records relating to or payments made on
account of beneficial ownership interests in the Index Warrant Global
Certificate or for maintaining, supervising or reviewing any records relating to
such beneficial ownership interests.
 
    If the Warrant Depositary is at any time unwilling or unable to continue as
depositary and a successor depositary is not appointed by the Company within 90
days, the Company will issue individual Index Warrant Certificates in exchange
for the Index Warrant Global Certificate. In addition, the Company may at any
time and in its sole discretion determine not to have certain Index Warrants
represented by an Index Warrant Global Certificate and, in such event, will
issue individual Index Warrant Certificates in exchange for such Global
Certificate. Further, if the Company so specifies with respect to any Index
Warrants, an owner of a beneficial interest in an Index Warrant Global
Certificate may, on such terms acceptable to the Company and the Warrant
Depositary, receive individual Index Warrants in exchange for such beneficial
interest. In any such instance, an owner of a beneficial interest in the Index
Warrant Global Certificate will be entitled to have Index Warrants equal in
aggregate number to such beneficial interest registered in its name and will be
entitled to physical delivery of such Index Warrants. The registered owner of
such Index Warrants will be entitled to receive any amounts payable in respect
of such Index Warrants, upon surrender of such Index Warrants to the Index
Warrant Agent in accordance with the procedures set forth in the Prospectus
Supplement.
 
LISTING
 
    Unless otherwise indicated in the Prospectus Supplement, the Index Warrants
will be listed on a national securities exchange or with a self-regulatory
organization, the rules and regulations of which are filed with the Commission
pursuant to Section 19(b) of the Exchange Act (a "Self-Regulatory
 
                                       19

Organization"), in each case as specified in the Prospectus Supplement. It is
expected that such Self-Regulatory Organization will cease trading a series of
Index Warrants as of the close of business on the related expiration date of
such Index Warrants.
 
MODIFICATION
 
    The Index Warrant Agreement and the terms of the related Index Warrants may
be amended by the Company and the Index Warrant Agent, without the consent of
the holders of any Index Warrants, for the purpose of curing any ambiguity or of
curing, correcting or supplementing any defective or inconsistent provision
contained therein, maintaining the listing of such Index Warrants on any
national securities exchange or with any other Self-Regulatory Organization or
registration of such Index Warrants under the Exchange Act, permitting the
issuance of individual Index Warrant certificates to Warrant Holders, reflecting
the issuance by the Company of additional Index Warrants of the same series or
reflecting the appointment of a successor depository, or for any other purpose
which the Company may deem necessary or desirable and which will not materially
and adversely affect the interests of the Warrant Holders.
 
    The Company and the Index Warrant Agent also may modify or amend the Index
Warrant Agreement and the terms of the related Index Warrants, with the consent
of the holders of not less than a majority in number of the then outstanding
Warrants affected by such modification or amendment, for any purposes; provided,
however, that no such modification or amendment that changes the amount to be
paid to the Warrant Holder or the manner in which such amount is to be
determined, shortens the period of time during which the Index Warrants may be
exercised, or otherwise materially and adversely affects the exercise rights of
the holders of the Index Warrants or reduces the percentage of the number of
outstanding Index Warrants the consent of whose holders is required for
modification or amendment of the Index Warrant Agreement or the terms of the
related Index Warrants, may be made without the consent of each Holder affected
thereby.
 
MERGER, CONSOLIDATION, SALE OR OTHER DISPOSITION
 
    If at any time there is a merger or consolidation involving the Company or a
sale, transfer, conveyance (other than by way of lease) or other disposition of
all or substantially all of the assets of the Company, then the successor or
assuming corporation will succeed to and be substituted for the Company under
the Index Warrant Agreement and the related Index Warrants, with the same effect
as if it had been named in such Index Warrant Agreement and Index Warrants as
the Company. The Company will thereupon be relieved of any further obligation
under such Index Warrant Agreement and Index Warrants and may at any time
thereafter be dissolved, wound up or liquidated.
 
ENFORCEABILITY OF RIGHTS BY WARRANT HOLDERS
 
    Any Warrant Holder may, without the consent of the Index Warrant Agent or
any other Warrant Holder, enforce by appropriate legal action on his own behalf
his right to exercise, and to receive payment for, his Index Warrants.
 
SPECIAL CONSIDERATIONS RELATING TO INDEX WARRANTS
 
    The Index Warrants involve a high degree of risk, including risks arising
from fluctuations in the values of the underlying securities, foreign currencies
or indexes, risks relating to the relevant index or indices by which payments or
distributions on the Index Warrants are calculated, general risks applicable to
the securities or currency markets on which the underlying securities, foreign
currencies or indices are traded and, in the case of certain Index Warrants,
foreign exchange, interest rate, issuer and other risks. Purchasers should
recognize that their Index Warrants, other than Index Warrants having a minimum
expiration value, may expire worthless. Purchasers should be prepared to sustain
a total loss
 
                                       20

of the purchase price of their Index Warrants, and are advised to consider
carefully the information set forth herein and in the applicable Prospectus
Supplement. Prospective purchasers of the Index Warrants should be experienced
with respect to options and options transactions and understand the risks of the
relevant index or indices and the underlying securities, foreign currencies or
indices (and, if applicable, foreign currency transactions), and should reach an
investment decision only after careful consideration, with their advisers, of
the suitability of the Index Warrants in light of their particular financial
circumstances, the information set forth herein under "Description of Index
Warrants," and the information regarding the Index Warrants, the relevant index
or indices and the underlying securities, foreign currencies or indices set
forth in the Prospectus Supplement.
 
                                       21

                         DESCRIPTION OF PREFERRED STOCK
 
    The following summary contains a description of certain general terms of the
Company's Preferred Stock to which any Prospectus Supplement may relate. Certain
terms of any series of Preferred Stock offered by any Prospectus Supplement will
be described in the Prospectus Supplement relating thereto. If so indicated in
the Prospectus Supplement, the terms of any series may differ from the terms set
forth below. The description of certain provisions of the Company's Preferred
Stock does not purport to be complete and is subject to and qualified in its
entirety by reference to the provisions of the Company's Certificate of
Incorporation (as defined below) and the Certificate of Designation relating to
each particular series of Preferred Stock which will be filed or incorporated by
reference, as the case may be, as an exhibit to the Registration Statement of
which this Prospectus forms a part at or prior to the time of the issuance of
such Preferred Stock. For a description of the Company's outstanding Preferred
Stock, see "Description of Capital Stock."
 
GENERAL
 
    The Preferred Stock may be issued in one or more series, with such
designations of titles; dividend rates; any redemption provisions; special or
relative rights in the event of liquidation, dissolution, distribution or
winding up of the Company; any sinking fund provisions; any conversion or
exchange provisions; any voting rights thereof; and any other preferences,
privileges, powers, rights, qualifications, limitations and restrictions, as
shall be set forth as and when established by the Board of Directors of the
Company. The shares of any series of Preferred Stock will be, when issued, fully
paid and nonassessable and holders thereof will have no preemptive rights in
connection therewith.
 
    The transfer agent, registrar, dividend disbursing agent and redemption
agent for shares of each series of Preferred Stock will be specified in the
Prospectus Supplement relating thereto.
 
RANK
 
    Unless otherwise specified in the Prospectus Supplement relating to the
shares of any series of Preferred Stock, such shares will rank on a parity with
each other series of Preferred Stock and prior to the Common Stock as to
dividends and distributions of assets.
 
DIVIDENDS
 
    Holders of each series of Preferred Stock will be entitled to receive, when,
as and if declared by the Board of Directors of the Company out of funds legally
available therefor, cash dividends at such rates and on such dates as are set
forth in the Prospectus Supplement relating to such series of Preferred Stock.
Such rates may be fixed or variable or both. Dividends will be payable to
holders of record of Preferred Stock as they appear on the books of the Company
(or, if applicable, the records of the Depositary referred to below under
"Description of Depositary Shares") on such record dates as shall be fixed by
the Board of Directors. Dividends on any series of Preferred Stock may be
cumulative or noncumulative.
 
    No full dividends may be declared or paid on funds set apart for the payment
of dividends on any series of Preferred Stock unless dividends shall have been
paid or set apart for such payment on equity securities ranking on a parity with
respect to dividends with such series of Preferred Stock. If full dividends are
not so paid, such series of Preferred Stock shall share dividends PRO RATA with
such other equity securities.
 
CONVERSION AND EXCHANGE
 
    The Prospectus Supplement for any series of Preferred Stock will state the
terms, if any, on which shares of that series are convertible into or
exchangeable for shares of the Company's Common Stock.
 
                                       22

REDEMPTION
 
    A series of Preferred Stock may be redeemable at any time, in whole or in
part, at the option of the Company or the holder thereof and may be subject to
mandatory redemption pursuant to a sinking fund or otherwise upon terms and at
the redemption prices set forth in the Prospectus Supplement relating to such
series.
 
    In the event of partial redemptions of Preferred Stock, whether by mandatory
or optional redemption, the shares to be redeemed will be determined by lot or
PRO RATA, as may be determined by the Board of Directors of the Company, or by
any other method determined to be equitable by the Board of Directors.
 
    On and after a redemption date, unless the Company defaults in the payment
of the redemption price, dividends will cease to accrue on shares of Preferred
Stock called for redemption and all rights of holders of such shares will
terminate except for the right to receive the redemption price.
 
LIQUIDATION PREFERENCE
 
    Upon any voluntary or involuntary liquidation, dissolution or winding up of
the Company, holders of each series of Preferred Stock will be entitled to
receive out of assets of the Company available for distribution to shareholders,
before any distribution is made on any securities ranking junior with respect to
liquidation, including Common Stock, distributions upon liquidation in the
amount set forth in the Prospectus Supplement relating to such series of
Preferred Stock, plus an amount equal to any accrued and unpaid dividends. If,
upon any voluntary or involuntary liquidation, dissolution or winding up of the
Company, the amounts payable with respect to the Preferred Stock of any series
and any other securities ranking on a parity with respect to liquidation rights
are not paid in full, the holders of the Preferred Stock of such series and such
other securities will share ratably in any such distribution of assets of the
Company in proportion to the full liquidation preferences to which each is
entitled. After payment of the full amount of the liquidation preference to
which they are entitled, the holders of such series of Preferred Stock will not
be entitled to any further participation in any distribution of assets of the
Company.
 
VOTING RIGHTS
 
    Except as indicated in the Prospectus Supplement or certificate of
designation relating to a particular series of Preferred Stock or except as
expressly required by applicable law, the holders of shares of Preferred Stock
will have no voting rights.
 
                                       23

                          DESCRIPTION OF CAPITAL STOCK
 
GENERAL
 
    As of the date of this Prospectus, the Company's authorized capital stock
consists of 6 billion shares of Common Stock and 30 million shares of Preferred
Stock. The following summary contains a description of certain general terms of
the Company's Common Stock to which any Prospectus Supplement may relate. The
descriptions below of certain provisions of the Company's Common Stock and
Preferred Stock do not purport to be complete and are subject to and qualified
in their entirety by reference to the Certificate of Incorporation which is
incorporated by reference as an exhibit to the Registration Statement of which
this Prospectus forms a part.
 
COMMON STOCK
 
    As of November 30, 1998, the Company had outstanding approximately 2.3
billion shares of its Common Stock. Each holder of Common Stock is entitled to
one vote per share for the election of directors and for all other matters to be
voted on by the Company's stockholders. Except as otherwise provided by law, the
holders of shares of Common Stock vote as one class together with the shares of
Series I Preferred Stock, Series J Preferred Stock and Series K Preferred Stock
(as defined below). Holders of Common Stock may not cumulate their votes in the
election of directors, and are entitled to share equally in such dividends as
may be declared by the Board of Directors out of funds legally available
therefor, but only after payment of dividends required to be paid on outstanding
shares of Preferred Stock.
 
    Upon voluntary or involuntary liquidation, dissolution or winding up of the
Company, the holders of the Common Stock share pro rata in the assets remaining
after payments to creditors and provision for the preference of any Preferred
Stock. There are no preemptive or other subscription rights, conversion rights
or redemption or sinking fund provisions with respect to shares of Common Stock.
All of the outstanding shares of Common Stock are fully paid and nonassessable.
The transfer agent and registrar for the Common Stock is Citibank, N.A. The
Common Stock is listed on the New York Stock Exchange, Inc. (the "NYSE") and The
Pacific Exchange, Inc.
 
PREFERRED STOCK
 
    Under the Company's Restated Certificate of Incorporation (as amended, the
"Certificate of Incorporation"), the Board of Directors of the Company is
authorized to issue shares of the Preferred Stock in one or more series, and to
establish from time to time the number of shares to be included in each such
series and to fix the designation, powers, preferences and rights of the shares
of each such series and the qualifications, limitations or restrictions thereof,
as will be stated and expressed in the resolution or resolutions providing for
the issue thereof adopted by the Board of Directors of the Company (except to
the extent stated and expressed in the Certificate of Incorporation). Prior to
the issuance of each series of Preferred Stock, the Board of Directors of the
Company will adopt resolutions creating and designating such series as a series
of Preferred Stock and such resolutions will be filed in a Certificate of
Designation (a "Certificate of Designation") as an amendment to the Certificate
of Incorporation. As used herein the term "Board of Directors of the Company"
means the Board of Directors of the Company and includes any duly authorized
committee thereof.
 
    The rights of holders of the Preferred Stock offered hereby will be subject
to, and may be adversely affected by, the rights of holders of any shares of
Preferred Stock that may be issued in the future. The Board of Directors may
cause shares of Preferred Stock to be issued in public or private transactions
for any proper corporate purpose, which may include issuance to obtain
additional financing in connection with acquisitions or otherwise, and issuance
to officers, directors and employees of the Company and its subsidiaries
pursuant to benefit plans or otherwise. Shares of Preferred Stock issued by the
Company may have the effect, under certain circumstances, alone or in
combination with
 
                                       24

certain other provisions of the Certificate of Incorporation described below, of
rendering more difficult or discouraging an acquisition of the Company deemed
undesirable by the Board of Directors of the Company.
 
    Under existing interpretations of The Board of Governors of the Federal
Reserve System (the "Federal Reserve Board") and the Office of Thrift
Supervision (the "OTS"), if the holders of the Preferred Stock become entitled
to vote for the election of directors because dividends on the Preferred Stock
are in arrears as described below, Preferred Stock may then be deemed a "class
of voting securities" and a holder of 25% or more of the Preferred Stock (or a
holder of 5% or more of the Preferred Stock that otherwise exercises a
"controlling influence" over the Company) may then be subject to regulation as a
"bank holding company" in accordance with the Bank Holding Company Act (the "BHC
Act"), and a holder of 25% or more of the Preferred Stock (or a holder of 10% or
more of the Preferred Stock that otherwise possesses certain "control factors"
with respect to the Company) may then be subject to regulation as a "savings and
loan holding company" in accordance with the Home Owner's Loan Act of 1933, as
amended. In addition, at such time, (i) any bank holding company or foreign bank
with a U.S. presence generally would be required to obtain the approval of the
Federal Reserve Board under the BHC Act to acquire or retain 5% or more of the
Preferred Stock; (ii) any person other than a bank holding company may be
required to obtain the approval of the Federal Reserve Board and the OTS under
the Change in Bank Control Act to acquire or retain 10% or more of the Preferred
Stock; and (iii) any savings and loan holding company generally could not retain
in excess of 5% of the Preferred Stock. Before exercising its option to redeem
any shares of Preferred Stock, the Company will obtain the approval of the
Federal Reserve Board to the extent then required by applicable law.
 
    No full dividends will be declared or paid or set apart for payment on the
preferred stock of any series ranking, as to dividends, on a parity with or
junior to any other series of Preferred Stock for any period unless full
dividends have been or are contemporaneously declared and paid or declared and a
sum sufficient for the payment thereof set apart for such payment on such series
of Preferred Stock for (i) all dividend periods terminating on or prior to the
date of payment of such full cumulative dividends (in the case of a series of
cumulative preferred stock) or (ii) the immediately preceding dividend period
(in the case of a series of noncumulative preferred stock).
 
    When dividends are not paid in full upon any series of Preferred Stock and
any other preferred stock ranking on a parity as to dividends with such series
of Preferred Stock, all dividends declared upon shares of such series of
Preferred Stock and any other preferred stock ranking on a parity as to
dividends will be declared pro rata so that the amount of dividends declared per
share on such series of Preferred Stock and such other preferred stock will in
all cases bear to each other the same ratio that accrued dividends per share
(which, in the case of noncumulative preferred stock, will not include any
cumulation in respect of unpaid dividends for prior dividend periods) on the
shares of such series of Preferred Stock and such other preferred stock bear to
each other. Except as provided in the preceding sentence, unless full dividends
on all outstanding shares of any such series of Preferred Stock have been
declared and paid or set apart for payment for all past dividend periods, in the
case of a series of cumulative preferred stock, or for the immediately preceding
dividend period, in the case of a series of noncumulative preferred stock, no
dividends (other than dividends or distributions paid in shares of, or options,
warrants or rights to subscribe for or purchase shares of, the Common Stock or
another stock of the Company ranking junior to the Preferred Stock as to
dividends and upon liquidation) will be declared or paid or set aside for
payment or other distribution declared or made upon the Common Stock or upon any
other stock of the Company ranking junior to or on parity with the Preferred
Stock as to dividends or upon liquidation, nor will any Common Stock nor any
other stock of the Company ranking junior to or on parity with such Preferred
Stock as to dividends or upon liquidation be redeemed, purchased or otherwise
acquired for any consideration (or any moneys be paid to or made available for a
sinking fund for the redemption of any shares of any such stock) by the Company
 
                                       25

(except by conversion into or exchange for stock of the Company ranking junior
to the Preferred Stock as to dividends and upon liquidation).
 
    All shares of Preferred Stock will rank on a parity on liquidation and as to
dividends (except as otherwise provided with respect to cumulation of dividends)
with each other series. No shares of Preferred Stock have any preemptive or
subscription rights.
 
    As of the date of this Prospectus, the Company had outstanding 1,600,000
shares (evidenced by 8,000,000 depositary shares, each of which represents a
one-fifth interest in a share of such stock) of its 6.365% Cumulative Preferred
Stock, Series F ("Series F Preferred Stock"), 800,000 shares (evidenced by
4,000,000 depositary shares, each of which represents a one-fifth interest in a
share of such stock) of its 6.213% Cumulative Preferred Stock, Series G ("Series
G Preferred Stock"), 800,000 shares (evidenced by 4,000,000 depositary shares,
each of which represents a one-fifth interest in a share of such stock) of its
6.231% Cumulative Preferred Stock, Series H ("Series H Preferred Stock"),
140,000 shares of its Series I Cumulative Convertible Preferred Stock ("Series I
Preferred Stock"), 400,000 shares (evidenced by 8,000,000 depositary shares,
each of which represents a one-twentieth interest in a share of such stock) of
its 8.08% Cumulative Preferred Stock, Series J ("Series J Preferred Stock"),
500,000 shares (evidenced by 10,000,000 depositary shares, each of which
represents a one-twentieth interest in a share of such stock) of its 8.40%
Cumulative Preferred Stock, Series K ("Series K Preferred Stock"), 800,000
shares (evidenced by 4,000,000 depositary shares, each of which represents a
one-fifth interest in a share of such stock) of its 5.864% Cumulative Preferred
Stock, Series M ("Series M Preferred Stock"), 625,000 shares of its Graduated
Rate Cumulative Preferred Stock, Series O ("Series O Preferred Stock"), 700,000
shares of its Adjustable Rate Cumulative Preferred Stock, Series Q (the "Series
Q Preferred Stock"), 400,000 shares of its Adjustable Rate Cumulative Preferred
Stock, Series R (the "Series R Preferred Stock"), 500,000 shares of its 8.30%
Noncumulative Preferred Stock, Series S (the "Series S Preferred Stock"),
600,000 shares of its 8 1/2% Noncumulative Preferred Stock, Series T (the
"Series T Preferred Stock"), 500,000 shares of its 7 3/4% Cumulative Preferred
Stock, Series U (the "Series U Preferred Stock"), 250,000 shares of its Fixed
Adjustable Rate Cumulative Preferred Stock, Series V (the "Series V Preferred
Stock"), and 2,262 shares of its Cumulative Adjustable Rate Preferred Stock,
Series Y (the "Series Y Preferred Stock"), all of which shares are fully paid
and nonassessable. No shares of the Company's 9.50% Cumulative Preferred Stock,
Series L ("Series L Preferred Stock") are outstanding as of the date hereof.
 
    SERIES F PREFERRED STOCK.  The Series F Preferred Stock is redeemable, in
whole or in part, at the Company's option at any time on or after June 16, 2007
at a redemption price equal to $250 per share, plus accrued and unpaid
dividends. The Series F Preferred Stock provides for cumulative quarterly
dividends at the rate of 6.365% per year, calculated as a percentage of the $250
per share liquidation value. The holders of the Series F Preferred Stock do not
have voting rights except (i) as provided by law, (ii) under certain
circumstances if six quarterly dividends are in arrears and (iii) that a
two-thirds vote of all shares of Preferred Stock then outstanding voting as a
class is required for the Company to (x) create any class of stock having a
preference as to dividends or distributions of assets over the Series F
Preferred Stock or (y) alter or change the provisions of the Certificate of
Incorporation so as to adversely affect the powers, preferences or rights of the
holders of Series F Preferred Stock. Depositary shares, each representing
one-fifth of a share of Series F Preferred Stock, are traded on the NYSE.
 
    SERIES G PREFERRED STOCK.  The Series G Preferred Stock is redeemable, in
whole or in part, at the Company's option at any time on or after July 11, 2007
at a redemption price equal to $250 per share, plus accrued and unpaid
dividends. The Series G Preferred Stock provides for cumulative quarterly
dividends at the rate of 6.213% per year, calculated as a percentage of the $250
per share liquidation value. The holders of the Series G Preferred Stock do not
have voting rights except (i) as provided by law, (ii) under certain
circumstances if six quarterly dividends are in arrears and (iii) that a
two-thirds vote of all shares of Preferred Stock then outstanding voting as a
class is required for the Company to
 
                                       26

(x) create any class of stock having a preference as to dividends or
distributions of assets over the Series G Preferred Stock or (y) alter or change
the provisions of the Certificate of Incorporation so as to adversely affect the
powers, preferences or rights of the holders of Series G Preferred Stock.
Depositary shares, each representing one-fifth of a share of Series G Preferred
Stock, are traded on the NYSE.
 
    SERIES H PREFERRED STOCK.  The Series H Preferred Stock is redeemable, in
whole or in part, at the Company's option at any time on or after September 8,
2007 at a redemption price equal to $250 per share, plus accrued and unpaid
dividends. The Series H Preferred Stock provides for cumulative quarterly
dividends at the rate of 6.231% per year, calculated as a percentage of the $250
per share liquidation value. The holders of the Series H Preferred Stock do not
have voting rights except (i) as provided by law, (ii) under certain
circumstances if six quarterly dividends are in arrears and (iii) that a
two-thirds vote of all shares of Preferred Stock then outstanding voting as a
class is required for the Company to (x) create any class of stock having a
preference as to dividends or distributions of assets over the Series H
Preferred Stock or (y) alter or change the provisions of the Certificate of
Incorporation so as to adversely affect the powers, preferences or rights of the
holders of Series H Preferred Stock. Depositary shares, each representing
one-fifth of a share of Series H Preferred Stock, are traded on the NYSE.
 
    SERIES I PREFERRED STOCK.  The remaining 140,000 shares of Series I
Preferred Stock will be redeemed on October 31, 1999, by a cash payment of
$1,000 per share plus an amount per share equal to all accrued and unpaid
dividends, whether declared or undeclared, to the date of redemption. Any shares
of Series I Preferred Stock purchased, redeemed or otherwise acquired by the
Company and not previously credited against its mandatory redemption obligation
may be applied, on a pro rata basis to mandatory redemption payments to be made.
The Series I Preferred Stock provides for quarterly dividends in the amount of
$22.50 per share. On and after the redemption date, dividends will cease to
accrue, provided that the redemption price has been duly paid or provided for.
 
    In addition to any voting rights provided in the Certificate of
Incorporation and any voting rights provided by law, the holders of shares of
Series I Preferred Stock are entitled to 44.60526 votes per share when voting as
a class with the Common Stock, subject to anti-dilution adjustment. The shares
of Series I Preferred Stock are entitled to vote together as a class with the
shares of Common Stock (and any other shares of capital stock of the Company at
the time entitled to vote together as a class) on all matters submitted to a
vote of stockholders of the Company. Holders of Series I Preferred Stock have
additional voting rights under certain circumstances if six quarterly dividends
are in arrears. In addition, holders of Series I Preferred Stock together with
all other series of Preferred Stock, voting as one class, must give their
approval by a two-thirds vote of shares of Preferred Stock then outstanding in
the event that the Company (i) authorizes shares of any class or series of stock
having a preference or priority as to dividends or liquidation ("Senior Stock")
over the Preferred Stock, (ii) reclassifies any shares of the Company stock into
shares of Senior Stock, (iii) authorizes any security exchangeable for,
convertible into, or evidencing the right to purchase any shares of Senior
Stock, (iv) amends, alters or repeals the Certificate of Incorporation to alter
or change the preferences, rights or powers of Preferred Stock so as to affect
the Preferred Stock adversely, or (v) effects the voluntary liquidation,
dissolution or winding up of the Company, or the sale, lease, exchange of all or
substantially all of the assets, property or business of the Company, or merges
or consolidates the Company with or into another corporation (except a wholly
owned subsidiary of the Company), provided that no separate vote of holders of
Preferred Stock as a class will be required in the case of a merger or
consolidation or a sale, exchange or conveyance of all or substantially all of
the assets, property or business of the Company (any such transaction, a
"transaction") if (A) the resulting, surviving or acquiring corporation will
have after such transaction no stock either authorized or outstanding (except
such stock of the Company as may have been authorized immediately preceding such
transaction, or such stock of the resulting, surviving or acquiring corporation
issued in exchange therefor) ranking prior to, or on a parity with, the
Preferred
 
                                       27

Stock or the stock of the resulting, surviving or acquiring corporation and (B)
if each holder of shares of Preferred Stock immediately preceding such
transaction will receive in exchange therefor the same number of shares of
stock, with substantially the same preferences, rights and powers, of the
resulting, surviving or acquiring corporation (the events described in clauses
(i) through (v) being referred to herein as the "Preferred Stock Voting
Events"). Finally, without obtaining the approval of a majority of the
outstanding shares of Preferred Stock voting separately as a class, the Company
may not amend the Certificate of Incorporation to increase the authorized amount
of Preferred Stock or to authorize any other stock ranking on a parity with the
Preferred Stock either as to payment of dividends or upon liquidation.
 
    Each share of Series I Preferred Stock is convertible (at the option of the
holder thereof) into 44.60526 shares of Common Stock, subject to anti-dilution
adjustment.
 
    SERIES J PREFERRED STOCK.  The Company, at its option, may redeem shares of
Series J Preferred Stock, as a whole or in part, at any time or from time to
time, at a price of $500 per share, plus an amount per share equal to all
accumulated but unpaid dividends thereon, whether or not declared, to the date
fixed for redemption. The Series J Preferred Stock provides for cumulative
quarterly dividends in the amount of $10.10 per share. Depositary shares, each
representing one-twentieth of a share of Series J Preferred Stock, are traded on
the NYSE.
 
    Holders of shares of Series J Preferred Stock are entitled to vote together
as a class with the shares of Common Stock (and any other shares of capital
stock of the Company at the time entitled to vote together as a class) on all
matters submitted to a vote of stockholders of the Company, provided that, when
voting with Common Stock, each share of Series J Preferred Stock is entitled to
three votes. Holders of Series J Preferred Stock have additional voting rights
under certain circumstances if six quarterly dividends are in arrears. In
addition, holders of Series J Preferred Stock together with all other series of
Preferred Stock, voting as one class, must give their approval by a two-thirds
vote of the then outstanding shares of Preferred Stock upon the occurrence of a
Preferred Stock Voting Event. Finally, without obtaining the approval of a
majority of the outstanding shares of Preferred Stock voting separately as a
class, the Company may not amend the Certificate of Incorporation so as to
increase the authorized amount of Preferred Stock or so as to authorize any
other class of stock ranking on a parity with the Preferred Stock either as to
payment of dividends or upon liquidation.
 
    SERIES K PREFERRED STOCK.  The Series K Preferred Stock is redeemable, in
whole or in part, at the Company's option at any time on or after March 31,
2001, at a redemption price equal to $500 per share, plus accrued and unpaid
dividends. The Series K Preferred Stock provides for cumulative quarterly
dividends in the amount of $10.50 per share. Depositary shares, each
representing one-twentieth of a share of Series K Preferred Stock, are traded on
the NYSE.
 
    Holders of shares of Series K Preferred Stock are entitled to vote together
as a class with the shares of Common Stock (and any other shares of capital
stock of the Company at the time entitled to vote together as a class) on all
matters submitted to a vote of stockholders of the Company, provided that, when
voting with Common Stock, each share of Series K Preferred Stock is entitled to
three votes. Holders of Series K Preferred Stock have voting rights under
certain circumstances if six quarterly dividends are in arrears. In addition,
holders of Series K Preferred Stock together with all other series of Preferred
Stock, voting as one class, must give their approval by a two-thirds vote of the
then outstanding shares of Preferred Stock upon the occurrence of a Preferred
Stock Voting Event. Finally, without obtaining the approval of a majority of the
outstanding shares of Preferred Stock voting separately as a class, the Company
may not amend the Certificate of Incorporation so as to increase the authorized
amount of Preferred Stock or so as to authorize any other class of stock ranking
on a parity with the Preferred Stock either as to payment of dividends or upon
liquidation.
 
                                       28

    SERIES L PREFERRED STOCK.  The Series L Preferred Stock will be issuable
upon the settlement of certain purchase contracts issued as a component of the
9 1/2% Trust Preferred Stock Units of SI Financing Trust I, a subsidiary of
Salomon Smith Barney Holdings Inc. ("SSBH"). Holders must settle the purchase
contracts on June 30, 2021; provided, however, that SSBH may accelerate
settlement of the purchase contracts to June 30, 2001. The Series L Preferred
Stock may not be redeemed prior to the later of June 30, 2001 and the date of
issuance of the Series L Preferred Stock, and will be redeemable on such date
and thereafter at SSBH's option at a redemption price equal to $500 per share
(the liquidation preference), plus accrued and unpaid dividends. The Series L
Preferred Stock will rank on a parity as to dividends and upon liquidation with
the outstanding series of Preferred Stock at the time of issuance. The Series L
Preferred Stock provides for cumulative quarterly dividends at the rate of 9.50%
per annum, calculated as a percentage of the $500 per share liquidation
preference. Holders of Series L Preferred Stock are entitled to three votes per
share when voting together as a class on all matters with the holders of the
Common Stock, the Series C Preferred Stock, the Series I Preferred Stock, the
Series J Preferred Stock and the Series K Preferred Stock. In addition, if six
quarterly dividends are in arrears the holders of the Series L Preferred Stock
will be entitled to certain additional voting rights. The vote of two-thirds of
all shares of Preferred Stock voting as a class will be required for the Company
to create any class of stock having a preference as to dividends or distribution
of assets over the Series L Preferred Stock.
 
    SERIES M PREFERRED STOCK.  The Series M Preferred Stock is redeemable, in
whole or in part, at the Company's option at any time on or after October 8,
2007 at a redemption price equal to $250 per share, plus an amount per share
equal to all accrued and unpaid dividends thereon, whether or not declared, to
the date fixed for redemption. The Series M Preferred Stock provides for
cumulative quarterly dividends at the rate of 5.864% per year, calculated as a
percentage of the $250 per share liquidation value. The holders of the Series M
Preferred Stock do not have voting rights except (i) as required by law, (ii)
under certain circumstances if six quarterly dividends are in arrears and (iii)
that a two-thirds vote of all shares of Preferred Stock then outstanding voting
as a class is required for the Company to (x) create any class of stock having a
preference as to dividends or distributions of assets over the Series M
Preferred Stock or (y) alter or change the provisions of the Certificate of
Incorporation so as to adversely affect the powers, preferences or rights of the
holders of Series M Preferred Stock. Depositary shares, each representing
one-fifth of a share of Series M Preferred Stock, are traded on the NYSE.
 
    SERIES O PREFERRED STOCK.  The Series O Preferred Stock is redeemable, in
whole or in part, at the Company's option, on August 15, 1999 and at any time
after August 15, 2004, at a redemption price equal to $100 per share, plus an
amount equal to all accrued and unpaid dividends thereon, whether or not
declared, to the date fixed for redemption. The Series O Preferred Stock may
also be redeemed as provided above and in certain other circumstances following
a Change in Tax Law (defined below), in each case at a redemption price equal to
$100 per share, plus an amount equal to accrued and unpaid dividends thereon,
whether or not declared, to the date fixed for redemption. The Series O
Preferred Stock provides for a cumulative dividend at a variable rate. For all
quarterly dividend periods ending on or prior to August 15, 1999, the annual
dividend rate is the Five-Year Treasury Rate (as defined in the Series O
Preferred Stock Certificate of Designation) plus 1.50%. After August 15, 1999
and on or prior to August 15, 2004, the annual dividend rate will be the
Five-Year Treasury Rate plus 2.25%. Prior to August 15, 2004, the above rates
may not be less than 7.00% nor greater than 14.00% per year, and after August
15, 2004, the rates may not be less than 8.00% nor greater than 16.00% per year.
The amount of dividends payable for each full dividend period for the Series O
Preferred Stock is computed by dividing the applicable dividend rate by four and
applying the dividend rate to the amount of $100.00 per share. The dividend rate
will be increased in the event of specified changes in the Internal Revenue Code
that would decrease the dividends received deduction applicable to corporate
stockholders (a "Change in Tax Law"). In the event of a liquidation, dissolution
or winding up of the Company, the holder of shares of the Series O Preferred
Stock will be entitled to receive $100 per
 
                                       29

share plus accrued and unpaid dividends (whether or not earned or declared) and
such holder will not be entitled to any further payment. The holders of the
Series O Preferred Stock do not have voting rights except (i) as required by
law, (ii) under certain circumstances if dividends are in arrears for such
number of dividend periods, whether or not consecutive, which in the aggregate
contain not less than 540 days, and (iii) that a two-thirds vote of all shares
of Preferred Stock then outstanding voting as a class is required for the
Company to (x) create any class of stock having a preference as to dividends or
distributions of assets over the Series O Preferred Stock or (y) alter or change
the provisions of the Certificate of Incorporation so as to materially and
adversely affect the powers, preferences or rights of the holders of Series O
Preferred Stock.
 
    SERIES Q PREFERRED STOCK.  Except as provided below, the Series Q Preferred
Stock is redeemable, in whole or in part, at the Company's option at any time on
or after May 31, 1999 at a redemption price of $250 per share, plus an amount
per share equal to all accrued and unpaid dividends thereon, whether or not
declared, to the date fixed for redemption. The Series Q Preferred Stock
provides for a cumulative dividend at a variable rate. For each dividend period
the dividend rate will be equal to 84% of the Effective Rate (as defined below),
but not less than 4.50% per year or more than 10.50% per year. The "Effective
Rate" for any dividend period will be equal to the highest of the Treasury Bill
Rate, the Ten Year Constant Maturity Rate and the Thirty Year Constant Maturity
Rate (each as defined in the Series Q Preferred Stock Certificate of
Designation) for such period. The amount of dividends payable for each full
dividend period for the Series Q Preferred Stock is computed by dividing the
dividend rate per year by four and applying the resulting rate to the amount of
$250 per share. In the event of a liquidation, dissolution or winding up of the
Company, the holder of shares of Series Q Preferred Stock will be entitled to
receive $250 per share plus accrued and unpaid dividends (whether or not
declared) and such holder will not be entitled to any further payment. The
holders of the Series Q Preferred Stock do not have voting rights except (i) as
required by law, (ii) under certain circumstances if dividends are in arrears
for such number of dividend periods, whether or not consecutive, which in the
aggregate contain not less than 540 days, and (iii) that a two-thirds vote of
all shares of Preferred Stock then outstanding voting as a class is required for
the Company to (x) create any class of stock having a preference as to dividends
or distributions of assets over the Series Q Preferred Stock or (y) alter or
change the provisions of the Certificate of Incorporation so as to materially
and adversely affect the powers, preferences or rights of the holders of Series
Q Preferred Stock.
 
    SERIES R PREFERRED STOCK.  Except as provided below, the Series R Preferred
Stock is redeemable, in whole or in part, at the Company's option at any time on
or after August 31, 1999, at a redemption price of $250 per share, plus an
amount per share equal to all accrued and unpaid dividends thereon, whether or
not declared, to the date fixed for redemption. The Series R Preferred Stock
provides for a cumulative dividend at a variable rate. The dividend rate for the
Series R Preferred Stock is calculated in the same manner as the dividend rate
is calculated for the Series Q Preferred Stock described above. In the event of
any liquidation, dissolution or winding up of the Company, the holder of shares
of Series R Preferred Stock will be entitled to receive $250 per share plus
accrued and unpaid dividends (whether or not declared) and such holder will not
be entitled to any further payment. The holders of the Series R Preferred Stock
do not have voting rights except (i) as required by law, (ii) under certain
circumstances if dividends are in arrears for such number of dividend periods,
whether or not consecutive, which in the aggregate contain not less than 540
days, and (iii) that a two-thirds vote of all shares of Preferred Stock then
outstanding voting as a class is required for the Company to (x) create any
class of stock having a preference as to dividends or distributions of assets
over the Series R Preferred Stock or (y) alter or change the provisions of the
Certificate of Incorporation so as to materially and adversely affect the
powers, preferences or rights of the holders of Series R Preferred Stock.
 
    SERIES S PREFERRED STOCK.  Except as provided below, the Series S Preferred
Stock is redeemable, in whole or in part, at the Company's option at any time on
or after November 15, 1999, at a
 
                                       30

redemption price of $250 per share, plus an amount per share equal to all
accrued and unpaid dividends thereon, whether or not declared, from the
immediately preceding dividend payment date (but without any cumulation for
unpaid dividends for prior dividend periods). The Series S Preferred Stock
provides for a noncumulative dividend in the amount of 8.30% per year. The
amount of dividends payable for each full dividend period for the Series S
Preferred Stock is computed by dividing the dividend rate of 8.30% per year by
four and applying the resulting rate of 2.075% to the amount of $250 per share.
In the event of a liquidation, dissolution or winding up of the Company, the
holder of shares of the Series S Preferred Stock will be entitled to receive
$250 per share plus accrued and unpaid dividends (whether or not declared) from
the immediately preceding dividend payment date (but without any cumulation for
unpaid dividends for prior dividend periods) and such holder will not be
entitled to any further payment. The holders of the Series S Preferred Stock do
not have any voting rights except (i) as required by law, (ii) under certain
circumstances if dividends are in arrears for such number of dividend periods,
whether or not consecutive, which in the aggregate contain not less than 540
days, and (iii) that a two-thirds vote of all shares of Preferred Stock then
outstanding voting as a class is required for the Company to (x) create any
class of stock having a preference as to dividends or distributions of assets
over the Series S Preferred Stock or (y) alter or change the provisions of the
Certificate of Incorporation so as to materially and adversely affect the
powers, preferences or rights of the holders of Series S Preferred Stock.
 
    SERIES T PREFERRED STOCK.  Except as provided below, the Series T Preferred
Stock is redeemable, in whole or in part, at the Company's option at any time on
or after February 15, 2000, at a redemption price of $250 per share, plus an
amount per share equal to all accrued and unpaid dividends, whether or not
declared, from the immediately preceding dividend payment date (but without any
cumulation for unpaid dividends for prior dividend periods). The Series T
Preferred Stock provides for a noncumulative dividend at a rate of 8.50% per
year. The amount of dividends payable for each full dividend period for the
Series T Preferred Stock is computed by dividing the dividend rate of 8.50% per
year by four and applying the resulting rate of 2.125% to the amount of $250 per
share. In the event of any liquidation, dissolution or winding up of the
Company, the holder of the shares of Series T Preferred Stock will be entitled
to receive $250 per share plus accrued and unpaid dividends (whether or not
declared) from the immediately preceding dividend payment date (but without any
cumulation for unpaid dividends for prior dividend periods) and such holder will
not be entitled to any further payment. The holders of the Series T Preferred
Stock do not have any voting rights except (i) as required by law, (ii) under
certain circumstances if dividends are in arrears for such number of dividend
periods, whether or not consecutive, which in the aggregate contain not less
than 540 days, and (iii) that a two-thirds vote of all shares of Preferred Stock
then outstanding voting as a class is required for the Company to (x) create any
class of stock having a preference as to dividends or distributions of assets
over the Series T Preferred Stock or (y) alter or change the provisions of the
Certificate of Incorporation so as to materially and adversely affect the
powers, preferences or rights of the holders of Series T Preferred Stock.
 
    SERIES U PREFERRED STOCK.  Except as provided below, the Series U Preferred
Stock is redeemable, in whole or in part, at the Company's option at any time on
or after May 15, 2000, at a redemption price of $250 per share, plus an amount
per share equal to all accrued and unpaid dividends, whether or not declared,
from the immediately preceding dividend payment date (but without any cumulation
for unpaid dividends for prior dividend periods). The Series U Preferred Stock
provides for a cumulative dividend at a rate of 7.75% per year. The amount of
dividends payable for each full dividend period for the Series U Preferred Stock
is computed by dividing the dividend rate of 7.75% per year by four and applying
the resulting rate of 1.9375% to the amount of $250 per share. In the event of
any liquidation, dissolution or winding up of the Company, the holder of shares
of the Series U Preferred Stock will be entitled to receive $250 per share plus
accrued and unpaid dividends (whether or not declared) and such holder will not
be entitled to any further payment. The holders of the Series U
 
                                       31

Preferred Stock do not have any voting rights except (i) as required by law,
(ii) under certain circumstances if dividends are in arrears for such number of
dividend periods, whether or not consecutive, which in the aggregate contain not
less than 540 days, and (iii) that a two-thirds vote of all shares of Preferred
Stock then outstanding voting as a class is required for the Company to (x)
create any class of stock having a preference as to dividends or distributions
of assets over the Series U Preferred Stock or (y) alter or change the
provisions of the Certificate of Incorporation so as to materially and adversely
affect the powers, preferences or rights of the holders of Series U Preferred
Stock.
 
    SERIES V PREFERRED STOCK.  Except as provided below, the Series V Preferred
Stock is redeemable, in whole or in part, at the Company's option at any time on
or after February 15, 2006, at a redemption price of $500 per share, plus an
amount per share equal to all accrued and unpaid dividends, whether or not
declared, to the date fixed for redemption. Prior to February 15, 2006, in the
event of a Change of Tax Law, the Company at its option may redeem all, but not
less than all, of the Series V Preferred Stock at a price declining over time
from $525 per share to $500 per share. The Series V Preferred Stock provides for
a cumulative dividend at a rate that changes over time. For each dividend period
up to but not including February 15, 2006, the dividend rate will be 5.86% per
year. The amount of dividends payable for each full Dividend Period for Series V
Preferred Stock is computed by dividing the dividend rate of 5.86% per year by
four and applying the resulting rate of 1.465% to the amount of $500 per share.
For each dividend period beginning on or after February 15, 2006, the dividend
rate on the shares of Series V Preferred Stock will be equal to 0.50% plus the
Effective Rate (as defined above under "Series Q Preferred Stock"), but not less
than 6.00% or more than 12.00%. The dividend rate will be increased in the event
of a Change in Tax Law. In the event of any liquidation, dissolution or winding
up of the Company, the holder of Series V Preferred Stock will be entitled to
receive $500 per share plus accrued and unpaid dividends thereon (whether or not
declared) and such holder will not be entitled to any further payment. The
holders of the Series V Preferred Stock do not have any voting rights except (i)
as required by law, (ii) under certain circumstances if dividends are in arrears
for such number of dividend periods, whether or not consecutive, which in the
aggregate contain not less than 540 days, and (iii) that a two-thirds vote of
all shares of Preferred Stock then outstanding voting as a class is required for
the Company to (x) create any class of stock having a preference as to dividends
or distributions of assets over the Series V Preferred Stock so as to materially
and adversely affect the powers, preferences or rights of the holders of Series
V Preferred Stock.
 
    SERIES Y PREFERRED STOCK.  The Series Y Preferred Stock, all of which is
owned by subsidiaries of the Company, is redeemable without premium at the
Company's option on any dividend payment date at a redemption price of $100,000
per share, plus accrued and unpaid dividends thereon to the date fixed for
redemption, and is subject to repurchase at the holder's request on specified
dates at its liquidation value of $100,000 per share, plus accrued and unpaid
dividends, if not redeemed on or prior to March 31, 1999. The holders of the
Series Y Preferred Stock are entitled to a cumulative quarterly dividend at an
annual rate equal to the greater of (i) the Short Term Rate (as defined below)
and (ii) 4.85%. The "Short Term Rate" generally will be equal to either 85% or
78% of the Money Market Yield (as defined in the Certificate of Incorporation)
of the 90-day rate for commercial paper multiplied by the stock's $100,000 per
share liquidation value. The holders of the Series Y Preferred Stock do not have
voting rights except (i) as required by law, (ii) under certain circumstances if
six quarterly dividends are in arrears and (iii) that a two-thirds vote of all
shares of Preferred Stock then outstanding voting as a class is required for the
Company to (x) create any class of stock having a preference as to dividends or
distributions of assets over the Series Y Preferred Stock or (y) alter or change
the provisions of the Certificate of Incorporation so as to adversely affect the
powers, preferences or rights of the holders of Series Y Preferred Stock.
 
                                       32

CERTAIN PROVISIONS OF THE COMPANY'S CERTIFICATE OF INCORPORATION AND BY-LAWS
 
    BUSINESS COMBINATIONS.  The Certificate of Incorporation requires the
affirmative vote of at least 66 2/3% of the votes entitled to be cast by the
holders of the then outstanding shares of Voting Stock (as defined therein),
voting together as a single class, excluding from such number of outstanding
shares and from such required vote Voting Stock beneficially owned by any
Interested Stockholder (defined therein, generally, as a 25% stockholder), to
approve any merger or other Business Combination (as defined therein, which term
includes a merger, sale of $25,000,000 of assets, and similar extraordinary
corporate transactions) between, or otherwise involving, the Company and any
Interested Stockholder, unless the transaction has been approved by a majority
of the Continuing Directors (as defined therein) in the manner described
therein, or under some circumstances, unless certain minimum price, form of
consideration and procedural requirements are satisfied.
 
    AMENDMENTS TO CERTIFICATE OF INCORPORATION AND BY-LAWS.  Under the
Certificate of Incorporation, the alteration, amendment or repeal of, or
adoption of any provision inconsistent with the provisions of the Certificate of
Incorporation relating to the issuance of Preferred Stock or Common Stock
requires the affirmative vote of the holders of at least 75% of the voting power
of the shares entitled to vote for the election of directors. Amendments of
provisions of the Certificate of Incorporation relating to Business Combinations
require a vote of the holders of 66 2/3% of the then outstanding shares of
Voting Stock, excluding Voting Stock held by Interested Stockholders, unless 75%
of the Board of Directors recommend such amendment and the directors comprising
such 75% would qualify as Continuing Directors. The Board of Directors, at any
meeting, may alter or amend the By-Laws upon the affirmative vote of at least
66 2/3% of the entire Board of Directors.
 
    VACANCIES.  Vacancies on the Board of Directors resulting from an increase
in the number of directors may be filled by a majority of the Board of Directors
then in office, provided that a quorum is present, and any additional director
elected to fill such a vacancy shall hold office for a term coinciding with the
remaining term of the class to which he was elected. Any other vacancies on the
Board of Directors may be filled by a majority of the directors then in office,
even if less than a quorum, and the director so elected shall have the same
remaining term as that of his predecessor.
 
                                       33

                        DESCRIPTION OF DEPOSITARY SHARES
 
    The description set forth below of certain material provisions of the
Deposit Agreement (as defined below) and of the Depositary Shares and Depositary
Receipts (as defined below) is subject to and qualified in its entirety by
reference to the forms of Deposit Agreement and Depositary Receipt relating to
the Preferred Stock, which are incorporated by reference as exhibits to the
Registration Statement of which this Prospectus forms a part at or prior to the
issuance of Depositary Shares. The particular terms of any Depositary Shares,
any Depositary Receipts and any Deposit Agreement relating to a particular
series of Preferred Stock which vary from the terms set forth below will be set
forth in the applicable Prospectus Supplement.
 
GENERAL
 
    The Company may, at its option, elect to offer fractional shares of
Preferred Stock, rather than full shares of Preferred Stock. In such event, the
Company will issue receipts for Depositary Shares, each of which will represent
a fraction (to be set forth in the Prospectus Supplement relating to a
particular series of Preferred Stock) of a share of a particular series of
Preferred Stock as described below.
 
    The shares of any series of Preferred Stock represented by Depositary Shares
will be deposited under a Deposit Agreement (the "Deposit Agreement") between
the Company and a bank or trust company selected by the Company having its
principal office in the United States and having a combined capital and surplus
of at least $50,000,000 (the "Preferred Stock Depositary"). Subject to the terms
of the Deposit Agreement, each owner of a Depositary Share will be entitled, in
proportion to the applicable fraction of a share of Preferred Stock represented
by such Depositary Share, to all the rights and preferences of the Preferred
Stock represented thereby (including dividend, voting, redemption, conversion
and liquidation rights).
 
    The Depositary Shares will be evidenced by depositary receipts issued
pursuant to the Deposit Agreement (the "Depositary Receipts"). Depositary
Receipts will be distributed to those persons purchasing the fractional shares
of Preferred Stock in accordance with the terms of the applicable Prospectus
Supplement.
 
    Pending the preparation of definitive Depositary Receipts, the Preferred
Stock Depositary may, upon the written order of the Company or any holder of
deposited Preferred Stock, execute and deliver temporary Depositary Receipts
which are substantially identical to, and entitle the holders thereof to all the
rights pertaining to, the definitive Depositary Receipts. Depositary Receipts
will be prepared thereafter without unreasonable delay, and temporary Depositary
Receipts will be exchangeable for definitive Depositary Receipts.
 
DIVIDENDS AND OTHER DISTRIBUTIONS
 
    The Preferred Stock Depositary will distribute all cash dividends or other
cash distributions received in respect of the deposited Preferred Stock to the
record holders of Depositary Shares relating to such Preferred Stock in
proportion to the number of such Depositary Shares owned by such holders.
 
    In the event of a distribution other than in cash, the Preferred Stock
Depositary will distribute property received by it to the record holders of
Depositary Shares entitled thereto. If the Preferred Stock Depositary determines
that it is not feasible to make such distribution, it may, with the approval of
the Company, sell such property and distribute the net proceeds from such sale
to such holders.
 
REDEMPTION OF PREFERRED STOCK
 
    If a series of Preferred Stock represented by Depositary Shares is to be
redeemed, the Depositary Shares will be redeemed from the proceeds received by
the Preferred Stock Depositary resulting from the redemption, in whole or in
part, of such series of Preferred Stock held by the Preferred Stock
 
                                       34

Depositary. The Depositary Shares will be redeemed by the Preferred Stock
Depositary at a price per Depositary Share equal to the applicable fraction of
the redemption price per share payable in respect of the shares of Preferred
Stock so redeemed. Whenever the Company redeems shares of Preferred Stock held
by the Preferred Stock Depositary, the Preferred Stock Depositary will redeem as
of the same date the number of Depositary Shares representing shares of
Preferred Stock so redeemed. If fewer than all the Depositary Shares are to be
redeemed, the Depositary Shares to be redeemed will be selected by the Preferred
Stock Depositary by lot or PRO RATA or by any other equitable method as may be
determined by the Preferred Stock Depositary.
 
WITHDRAWAL OF PREFERRED STOCK
 
    Any holder of Depositary Shares may, upon surrender of the Depositary
Receipts at the corporate trust office of the Preferred Stock Depositary (unless
the related Depositary Shares have previously been called for redemption),
receive the number of whole shares of the related series of Preferred Stock and
any money or other property represented by such Depositary Receipts. Holders of
Depositary Shares making such withdrawals will be entitled to receive whole
shares of Preferred Stock on the basis set forth in the related Prospectus
Supplement for such series of Preferred Stock, but holders of such whole shares
of Preferred Stock will not thereafter be entitled to deposit such Preferred
Stock under the Deposit Agreement or to receive Depositary Receipts therefor. If
the Depositary Shares surrendered by the holder in connection with such
withdrawal exceed the number of Depositary Shares that represent the number of
whole shares of Preferred Stock to be withdrawn, the Preferred Stock Depositary
will deliver to such holder at the same time a new Depositary Receipt evidencing
such excess number of Depositary Shares.
 
VOTING DEPOSITED PREFERRED STOCK
 
    Upon receipt of notice of any meeting at which the holders of any series of
deposited Preferred Stock are entitled to vote, the Preferred Stock Depositary
will mail the information contained in such notice of meeting to the record
holders of the Depositary Shares relating to such series of Preferred Stock.
Each record holder of such Depositary Shares on the record date (which will be
the same date as the record date for the relevant series of Preferred Stock)
will be entitled to instruct the Preferred Stock Depositary as to the exercise
of the voting rights pertaining to the amount of the Preferred Stock represented
by such holder's Depositary Shares. The Preferred Stock Depositary will
endeavor, insofar as practicable, to vote the amount of such series of Preferred
Stock represented by such Depositary Shares in accordance with such
instructions, and the Company will agree to take all reasonable actions that may
be deemed necessary by the Preferred Stock Depositary in order to enable the
Preferred Stock Depositary to do so. The Preferred Stock Depositary will vote
all shares of any series of Preferred Stock held by it proportionately with
instructions received, to the extent it does not receive specific instructions
from the holders of Depositary Shares representing such series of Preferred
Stock.
 
AMENDMENT AND TERMINATION OF THE DEPOSIT AGREEMENT
 
    The form of Depositary Receipt evidencing the Depositary Shares and any
provision of the Deposit Agreement may at any time be amended by agreement
between the Company and the Preferred Stock Depositary. However, any amendment
that imposes additional charges or materially and adversely alters any
substantial existing right of the holders of Depositary Shares will not be
effective unless such amendment has been approved by the holders of at least a
majority of the affected Depositary Shares then outstanding. Every holder of an
outstanding Depositary Receipt at the time any such amendment becomes effective,
or any transferee of such holder, shall be deemed, by continuing to hold such
Depositary Receipt, or by reason of the acquisition thereof, to consent and
agree to such amendment and to be bound by the Deposit Agreement as amended
thereby. The Deposit Agreement automatically terminates if (i) all outstanding
Depositary Shares have been redeemed; or (ii) each share
 
                                       35

of Preferred Stock has been converted into or exchanged for Common Stock; or
(iii) there has been a final distribution in respect of the Preferred Stock in
connection with any liquidation, dissolution or winding up of the Company and
such distribution has been distributed to the holders of Depositary Shares. The
Deposit Agreement may be terminated by the Company at any time and the Preferred
Stock Depositary will provide notice of such termination to the record holders
of all outstanding Depositary Receipts not less than 30 days prior to the
termination date, in which event the Preferred Stock Depositary will deliver or
make available for delivery to holders of Depositary Shares, upon surrender of
such Depositary Shares, the number of whole or fractional shares of the related
series of Preferred Stock as are represented by such Depositary Shares.
 
CHARGES OF PREFERRED STOCK DEPOSITARY; TAXES AND OTHER GOVERNMENTAL CHARGES
 
    No fees, charges and expenses of the Preferred Stock Depositary or any agent
of the Preferred Stock Depositary or of any registrar shall be payable by any
person other than the Company, except for any taxes and other governmental
charges and except as provided in the Deposit Agreement. If the Preferred Stock
Depositary incurs fees, charges or expenses for which it is not otherwise liable
hereunder at the election of a holder of a Depositary Receipt or other person,
such holder or other person will be liable for such fees, charges and expenses.
All other fees, charges, and expenses of the Preferred Stock Depositary and any
agent of the Preferred Stock Depositary under the Deposit Agreement and of any
registrar (including, in each case, fees and expenses of counsel) incident to
the performance of their respective obligations hereunder will be paid from time
to time upon consultation and agreement between the Preferred Stock Depositary
and the Company as to the amount and nature of such fees, charges and expenses.
 
RESIGNATION AND REMOVAL OF DEPOSITARY
 
    The Preferred Stock Depositary may resign at any time by delivering to the
Company notice of its intent to do so, and the Company may at any time remove
the Preferred Stock Depositary, any such resignation or removal to take effect
upon the appointment of a successor Preferred Stock Depositary and its
acceptance of such appointment. Such successor Preferred Stock Depositary must
be appointed within 60 days after delivery of the notice of resignation or
removal and must be a bank or trust company having its principal office in the
United States and having a combined capital and surplus of at least $50,000,000.
 
MISCELLANEOUS
 
    The Preferred Stock Depositary will forward all reports and communications
from the Company which are delivered to the Preferred Stock Depositary and which
the Company is required to furnish to the holders of the deposited Preferred
Stock.
 
    Neither the Preferred Stock Depositary nor the Company will be liable if it
is prevented or delayed by law or any circumstances beyond its control in
performing its obligations under the Deposit Agreement. The obligations of the
Company and the Preferred Stock Depositary under the Deposit Agreement will be
limited to performance in good faith of their duties thereunder and they will
not be obligated to prosecute or defend any legal proceeding in respect of any
Depositary Shares, Depositary Receipts or shares of Preferred Stock unless
satisfactory indemnity is furnished. The Company and the Preferred Stock
Depositary may rely upon written advice of counsel or accountants, or upon
information provided by holders of Depositary Receipts or other persons believed
to be competent and on documents believed to be genuine.
 
                                       36

                              PLAN OF DISTRIBUTION
 
    The Company may offer the Offered Securities in one or more of the following
ways from time to time: (i) to or through underwriters or dealers; (ii)
directly; (iii) through agents; or through a combination of any of these methods
of sale. Any such underwriters, dealers or agents may include any broker-dealer
subsidiary of the Company (each, a "Broker-Dealer Subsidiary"). The Prospectus
Supplement with respect to an offering of Offered Securities will set forth (i)
the terms of such offering, including the name or names of any underwriters,
dealers or agents, (ii) the purchase price of the Offered Securities and the
proceeds to the Company from such sale, (iii) any underwriting discounts and
commissions or agency fees and other items constituting underwriters' or agents'
compensation, (iv) the initial public offering price, (v) any discounts or
concessions to be allowed or reallowed or paid to dealers and (vi) any
securities exchanges on which such Offered Securities may be listed. Any initial
public offering prices, discounts or concessions allowed or reallowed or paid to
dealers may be changed from time to time.
 
    If underwriters are used in an offering of Offered Securities, such Offered
Securities will be acquired by the underwriters for their own account and may be
resold from time to time in one or more transactions, including negotiated
transactions, at a fixed public offering price or at varying prices determined
at the time of sale. The securities may be either offered to the public through
underwriting syndicates represented by one or more managing underwriters or by
one or more underwriters without a syndicate. Unless otherwise set forth in the
Prospectus Supplement, the obligations of the underwriters to purchase Offered
Securities will be subject to certain conditions precedent, and the underwriters
will be obligated to purchase all such Offered Securities if any are purchased.
 
    In connection with underwritten offerings of the Offered Securities and in
accordance with applicable law and industry practice, underwriters may
over-allot or effect transactions which stabilize, maintain or otherwise affect
the market price of the Offered Securities at levels above those which might
otherwise prevail in the open market, including by entering stabilizing bids,
effecting syndicate covering transactions or imposing penalty bids. A
stabilizing bid means the placing of any bid, or the effecting of any purchase,
for the purpose of pegging, fixing or maintaining the price of a security. A
syndicate covering transaction means the placing of any bid on behalf of the
underwriting syndicate or the effecting of any purchase to reduce a short
position created in connection with the offering. A penalty bid means an
arrangement that permits the managing underwriter to reclaim a selling
concession from a syndicate member in connection with the offering when Offered
Securities originally sold by the syndicate member are purchased in syndicate
covering transactions. Such transactions may be effected on the New York Stock
Exchange, in the over-the-counter market, or otherwise. Underwriters are not
required to engage in any of these activities. Any such activities, if
commenced, may be discontinued at any time.
 
    If dealers are utilized in the sale of Offered Securities, the Company will
sell such Offered Securities to the dealers as principals. The dealers may then
resell such Offered Securities to the public at varying prices to be determined
by such dealers at the time of resale. The names of the dealers and the terms of
the transaction will be set forth in the Prospectus Supplement relating thereto.
 
    Offered Securities may be sold directly by the Company to one or more
institutional purchasers, or through agents designated by the Company from time
to time, at a fixed price or prices, which may be changed, or at varying prices
determined at the time of sale. Any agent involved in the offer or sale of the
Offered Securities in respect of which this Prospectus is delivered will be
named, and any commissions payable by the Company to such agent will be set
forth, in the Prospectus Supplement relating thereto. Unless otherwise indicated
in such Prospectus Supplement, any such agent will be acting on a best efforts
basis for the period of its appointment.
 
    As one of the means of direct issuance of Offered Securities, the Company
may utilize the services of an entity through which it may conduct an electronic
"dutch auction" or similar offering of the
 
                                       37

Offered Securities among potential purchasers who are eligible to participate in
the auction or offering of such Offered Securities, if so described in the
applicable Prospectus Supplement.
 
    If so indicated in the applicable Prospectus Supplement, the Company will
authorize agents, underwriters or dealers to solicit offers from certain types
of institutions to purchase Offered Securities from the Company at the public
offering price set forth in such Prospectus Supplement pursuant to delayed
delivery contracts providing for payment and delivery on a specified date in the
future. Such contracts will be subject only to those conditions set forth in the
Prospectus Supplement and the Prospectus Supplement will set forth the
commission payable for solicitation of such contracts.
 
    The Broker-Dealer Subsidiaries are members of the National Association of
Securities Dealers, Inc. (the "NASD") and subsidiaries of the Company, and may
participate in distributions of the Offered Securities. Accordingly, offerings
of Offered Securities in which Broker-Dealer Subsidiaries participate will
conform with the requirements set forth in Rule 2720 of the Conduct Rules of the
NASD.
 
    This Prospectus together with an applicable Prospectus Supplement may also
be used by any Broker-Dealer Subsidiary in connection with offers and sales of
the Offered Securities in market-making transactions at negotiated prices
related to prevailing market prices at the time of sale. Any Broker-Dealer
Subsidiary may act as principal or agent in such transactions. No Broker-Dealer
Subsidiary has any obligation to make a market in any of the Offered Securities
and may discontinue any market-making activities at any time without notice, at
its sole discretion.
 
    Underwriters, dealers and agents may be entitled, under agreements with the
Company, to indemnification by the Company against certain civil liabilities,
including liabilities under the Securities Act. Underwriters, dealers and agents
may be customers of, engage in transactions with, or perform services for, the
Company and affiliates of the Company in the ordinary course of business.
 
    Each series of Offered Securities will be a new issue of securities and will
have no established trading market. Any underwriters to whom Offered Securities
are sold for public offering and sale may make a market in such Offered
Securities, but such underwriters will not be obligated to do so and may
discontinue any market making at any time without notice. The Offered Securities
may or may not be listed on a national securities exchange. No assurance can be
given that there will be a market for the Offered Securities.
 
                                 ERISA MATTERS
 
    By virtue of the Company's affiliation with certain of its subsidiaries,
including insurance company subsidiaries and the Broker-Dealer Subsidiaries,
that provide services to many employee benefit plans, including investment
advisory and asset management services, the Company and any direct or indirect
subsidiary of the Company may each be considered a "party in interest" within
the meaning of the Employee Retirement Income Security Act of 1974, as amended
("ERISA"), and a "disqualified person" under corresponding provisions of the
Internal Revenue Code of 1986 (the "Code"), with respect to many employee
benefit plans. "Prohibited transactions" within the meaning of ERISA and the
Code may result if any Offered Securities are acquired by an employee benefit
plan with respect to which the Company or any direct or indirect subsidiary of
the Company is a party in interest, unless such Offered Securities are acquired
pursuant to an applicable exemption. Any employee benefit plan or other entity
subject to such provisions of ERISA or the Code proposing to acquire the Offered
Securities should consult with its legal counsel.
 
                                       38

                                 LEGAL MATTERS
 
    The validity of the Offered Securities will be passed upon for the Company
by Stephanie B. Mudick, Esq., General Counsel-Corporate Law of the Company, 153
East 53(rd) Street, New York, NY 10043 and/or Skadden, Arps, Slate, Meagher &
Flom LLP, New York, New York, or by counsel to be identified in the applicable
Prospectus Supplement. Ms. Mudick, General Counsel-Corporate Law and Assistant
Secretary of the Company, beneficially owns, or has rights to acquire under the
Company's employee benefit plans, an aggregate of less than 1% of the Company's
Common Stock. Certain legal matters will be passed upon for the underwriters or
agents by Dewey Ballantine LLP, New York, New York, or by counsel to be
identified in the applicable Prospectus Supplement. Dewey Ballantine LLP has
from time to time acted as counsel for the Company and certain of its
subsidiaries and may do so in the future. Kenneth J. Bialkin, a partner of
Skadden, Arps, Slate, Meagher & Flom LLP, is a director of the Company, and he
and other attorneys in such firm beneficially own an aggregate of less than one
percent of the Common Stock of the Company. A member of Dewey Ballantine LLP
participating in this matter is the beneficial owner of shares of the Company's
Common Stock.
 
                                    EXPERTS
 
    The consolidated financial statements and schedules of Travelers Group Inc.
("Travelers") as of December 31, 1997 and 1996, and for each of the years in the
three-year period ended December 31, 1997, incorporated by reference or included
in Travelers' Annual Report on Form 10-K, as amended, for the year ended
December 31, 1997, and incorporated by reference herein, have been audited by
KPMG Peat Marwick LLP, independent certified public accountants, as set forth in
their reports thereon (also incorporated by reference herein), which reports
state that KPMG Peat Marwick LLP did not audit the consolidated financial
statements of Salomon Inc and its subsidiaries, appearing in Salomon Inc's
Annual Report on Form 10-K for the year ended December 31, 1996 (the "Salomon
Financials"), as of December 31, 1996, and for each of the two years in the
period ended December 31, 1996 and that their opinion with respect to any
amounts derived from the Salomon Financials is based on the report of Arthur
Andersen LLP. The consolidated financial statements of Travelers referred to
above are incorporated by reference herein in reliance upon such reports and
upon the authority of said firms as experts in accounting and auditing.
 
    The consolidated financial statements of Citicorp and its subsidiaries as of
December 31, 1997 and 1996, and for each of the years in the three-year period
ended December 31, 1997, and the related consolidated balance sheets of
Citibank, N.A. and subsidiaries as of December 31, 1997 and 1996, included in
the 1997 Citicorp Annual Report and Form 10-K, have been incorporated by
reference herein, in reliance upon the report (also incorporated by reference
herein) of KPMG Peat Marwick LLP, independent certified public accountants, and
upon the authority of said firm as experts in accounting and auditing.
 
    The supplemental consolidated financial statements and schedule of Citigroup
Inc. (formerly Travelers Group Inc.) ("Citigroup") as of December 31, 1997 and
1996, and for each of the years in the three-year period ended December 31,
1997, included in Citigroup's Current Report on Form 8-K dated October 26, 1998,
have been audited by KPMG Peat Marwick LLP, independent certified public
accountants, as set forth in their report thereon, included therein and
incorporated herein by reference, which report states that KPMG Peat Marwick LLP
did not audit the Salomon Financials (as defined above) and that their opinion
with respect to any amounts derived from the Salomon Financials is based on the
report of Arthur Andersen LLP. Generally accepted accounting principles
proscribe giving effect to a consummated business combination accounted for by
the pooling of interests method in financial statements that do not include the
date of consummation. The supplemental consolidated financial statements do not
extend through the date of consummation. However, they will become the
historical consolidated financial statements of Citigroup after financial
statements covering the date of
 
                                       39

consummation of the business combination are issued. The supplemental
consolidated financial statements referred to above are incorporated by
reference herein in reliance upon such reports given the authority of said firms
as experts in accounting and auditing. To the extent that KPMG Peat Marwick LLP
audits and reports on consolidated financial statements of Citigroup issued at
future dates, and consents to the use of their report thereon, such consolidated
financial statements also will be incorporated by reference in the registration
statement in reliance upon their report and said authority.
 
                             AVAILABLE INFORMATION
 
    Our Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports and other information with the SEC. You can inspect and
copy such reports and other information at the public reference facilities
maintained by the SEC at: Room 1024, 450 Fifth Street, N.W., Washington, D.C.
20549; Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois
60661-2511; and Seven World Trade Center, New York, New York 10048. You can also
obtain copies of such material from the Public Reference Section of the SEC at
450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. The SEC
also maintains a site on the World Wide Web, the address of which is
http://www.sec.gov, that contains reports, proxy and information statements and
other information regarding issuers, such as our Company, that file
electronically with the SEC. The Company's common stock is listed on the NYSE
and The Pacific Exchange, Inc., and such reports, proxy statements, and other
information can also be inspected at the offices of the New York Stock Exchange,
Inc., 20 Broad Street, New York, New York 10005, and The Pacific Exchange, Inc.,
301 Pine Street, San Francisco, California 94104, and 233 South Beaudry Avenue,
Los Angeles, California 90012.
 
    We have filed with the SEC a Registration Statement on Form S-3 (the
"Registration Statement," which term shall include all amendments, exhibits,
annexes and schedules thereto) pursuant to the Securities Act of 1933, as
amended (the "Securities Act"), with respect to the Offered Securities. This
Prospectus does not contain all the information set forth in the Registration
Statement, certain parts of which are omitted in accordance with the rules and
regulations of the SEC. For further information with respect to the Company and
the Offered Securities, reference is made to the Registration Statement and
exhibits thereto. Statements contained in this Prospectus as to the contents of
any contract or other document are not necessarily complete, and in each
instance reference is made to the copy of such contract or document filed as an
exhibit to the Company's Registration Statement, each such statement being
qualified in all respects by such reference.
 
                                       40

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    Our Company incorporates by reference into this Prospectus the following
documents previously filed with the SEC pursuant to the Exchange Act:
 
1.  Annual Report on Form 10-K, as amended, of the Company for the fiscal year
    ended
    December 31, 1997;
 
2.  Quarterly Reports on Form 10-Q of the Company for the quarters ended March
    31, 1998, June 30, 1998 and September 30, 1998;
 
3.  Current Reports on Form 8-K of the Company, dated January 6, 1998, January
    26, 1998, February 17, 1998, April 6, 1998, April 8, 1998, April 20, 1998,
    June 1, 1998, July 20, 1998, August 18, 1998, August 31, 1998, October 8,
    1998, October 21, 1998, October 26, 1998, October 29, 1998, November 1, 1998
    and November 13, 1998; and
 
4.  Registration Statement on Form 8-B, dated May 10, 1988, describing the
    Common Stock, including any amendments or reports filed for the purpose of
    updating such description.
 
    Any documents we file pursuant to Section 13(a), 13(c), 14 or 15(d) of the
Exchange Act subsequent to the date of this Prospectus and prior to the later of
(i) the termination of the offering of Offered Securities hereby and (ii) the
date on which any Broker-Dealer Subsidiary ceases offering and selling Offered
Securities pursuant to this Prospectus shall be deemed to be incorporated by
reference in this Prospectus and to be a part hereof from the date of filing of
such document.
 
    Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any other subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed to constitute a part of
this Prospectus except as so modified or superseded.
 
    We will provide without charge to each person to whom this Prospectus is
delivered, on the written or oral request of any such person, a copy of any or
all of the documents incorporated by reference in the Registration Statement of
which this Prospectus forms a part other than exhibits to such documents unless
such exhibits are specifically incorporated by reference into such documents.
Requests should be directed to Citigroup Inc., 153 East 53(rd) Street, New York,
NY 10043; Attention: Treasurer; telephone (212) 559-1000.
 
                                       41

                 SUBJECT TO COMPLETION, DATED DECEMBER 15, 1998
 
PROSPECTUS SUPPLEMENT
(To Prospectus Dated               , 1998)
THE INFORMATION IN THIS PROSPECTUS SUPPLEMENT IS NOT COMPLETE AND MAY BE
CHANGED. WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED
WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS
SUPPLEMENT IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN
OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT
PERMITTED.

                                 $6,000,000,000
 
                                     [LOGO]
 
                       MEDIUM-TERM SENIOR NOTES, SERIES A
                    MEDIUM-TERM SUBORDINATED NOTES, SERIES A
                 DUE NINE MONTHS OR MORE FROM THE DATE OF ISSUE
 
                             GENERAL TERMS OF SALE
 
    The following terms will generally apply to the medium-term senior and
subordinated notes that we will sell from time to time using this Prospectus
Supplement and the attached Prospectus. We will include information on the
specific terms for each note in a Pricing Supplement to this Prospectus
Supplement that we will deliver to prospective buyers of any note. The maximum
amount that we expect to receive from the sale of the notes is between
$5,820,000,000 and $5,992,500,000 after paying the agent commissions of between
$7,500,000 and $180,000,000.
 

                
MATURITY:          9 months or more from the date of
                   issue.
 
INTEREST RATES:    Fixed, Floating, or Zero Coupon.
 
BASE FLOATING
RATES:             Floating Interest Rates may be based,
                   among others, on:
                   - LIBOR
                   - Commercial Paper Rate
                   - Treasury Rate
                   - CD Rate
                   - Prime Rate
                   - J.J. Kenny Rate
                   - Eleventh District Cost of Funds Rate
                   - Federal Funds Rate
 
INDEXED NOTES:     Payments of interest or principal may
                   be linked to the price of one or more
                   securities, currencies, commodities or
                   other goods.
 
PAYMENT DATES:     Generally semi-annually for Fixed Rate
                   Notes.
 
                   Interest on Floating Rate or Indexed
                   Notes may be paid monthly, quarterly,
                   semi-annually or annually.
 
FORM:              Certificated or book-entry form.
 
CURRENCIES:        U.S. Dollars and other currencies.
 
OTHER TERMS: YOU SHOULD REVIEW "DESCRIPTION OF NOTES" AND
THE PRICING SUPPLEMENT FOR FEATURES THAT APPLY TO YOUR
NOTES. TERMS OF SPECIFIC NOTES MAY PERMIT ONE OR MORE OF
THESE FEATURES:
                   - May be redeemable or repurchasable by
                     us;
                   - May be repayable at your option;
                   - May be renewable at your option or
                     extendible at our option;
                   - Interest rate may be reset at our
                   option from time to time and be
                     redeemable by you at the time of any
                     reset;
                   - May be issued with Original Issue
                     Discount for tax purposes; or
                   - Portion of principal may be payable
                   prior to maturity.
 
SALES OF NOTES:    Notes may be sold through:
                   - our broker-dealer subsidiary, as the
                     Agent, or as principal; or
                   - such other dealers that the Company
                   may choose.
 
RISKS:             Notes may be subject to certain
                   indexation and currency risks. CONSIDER
                   CAREFULLY THE INFORMATION UNDER
                   "CURRENCY RISKS" AND "RISKS OF INDEXED
                   NOTES" BEGINNING ON PAGE S-25 OF THIS
                   PROSPECTUS SUPPLEMENT.
 
RANKING:           Senior Notes are part of our Senior
                   Indebtedness; and
                   Subordinated Notes are part of our
                   Subordinated Indebtedness.
DENOMINATION:      Minimum of $1,000, increased in
                   multiples of $1,000.

 
                           --------------------------
 
    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES OR
INSURANCE COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR
DETERMINED IF THIS PROSPECTUS SUPPLEMENT OR ANY ACCOMPANYING PROSPECTUS OR
PRICING SUPPLEMENT IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.
 
    THE NOTES OFFERED HEREBY ARE NOT DEPOSITS OR SAVINGS ACCOUNTS BUT ARE
UNSECURED DEBT OBLIGATIONS OF THE COMPANY AND ARE NOT INSURED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENTAL AGENCY OR
INSTRUMENTALITY.
 
              , 1998

YOU SHOULD ONLY RELY ON THE INFORMATION CONTAINED OR INCORPORATED BY REFERENCE
IN THIS PROSPECTUS SUPPLEMENT, THE PROSPECTUS AND IN ANY PRICING SUPPLEMENT. WE
HAVE NOT, AND THE AGENT (AS DEFINED HEREIN) HAS NOT, AUTHORIZED ANY OTHER PERSON
TO PROVIDE YOU WITH DIFFERENT INFORMATION. IF ANYONE PROVIDES YOU WITH DIFFERENT
OR INCONSISTENT INFORMATION, YOU SHOULD NOT RELY ON IT. WE ARE NOT, AND THE
AGENT IS NOT, MAKING AN OFFER TO SELL THESE SECURITIES IN ANY JURISDICTION WHERE
THE OFFER OR SALE IS NOT PERMITTED. YOU SHOULD ASSUME THAT THE INFORMATION
APPEARING IN THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS, AS WELL AS
INFORMATION WE PREVIOUSLY FILED WITH THE SECURITIES AND EXCHANGE COMMISSION AND
INCORPORATED BY REFERENCE, IS ACCURATE AS OF THE DATE ON THE FRONT COVER OF THIS
PROSPECTUS SUPPLEMENT ONLY (OR, IN THE CASE OF ANY PRICING SUPPLEMENT, AS OF THE
DATE OF SUCH PRICING SUPPLEMENT). OUR BUSINESS, FINANCIAL CONDITION, RESULTS OF
OPERATIONS AND PROSPECTS MAY HAVE CHANGED SINCE THAT DATE.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
                             PROSPECTUS SUPPLEMENT
 


                                                                                          PAGE
                                                                                          -----
                                                                                    
Important Currency Information.......................................................         S-3
Description of Notes.................................................................         S-3
Currency Risks.......................................................................        S-25
Risks of Indexed Notes...............................................................        S-26
Certain United States Federal Income Tax Considerations..............................        S-27
Plan of Distribution.................................................................        S-33

 
                                   PROSPECTUS
 

                                                                                      
Prospectus Summary.....................................................................          2
Use of Proceeds and Hedging............................................................          4
Ratio of Income to Fixed Charges and Ratio of Income to Combined Fixed Charges
  Including
    Preferred Stock Dividends..........................................................          5
European Monetary Union................................................................          6
Description of Debt Securities.........................................................          7
Description of Index Warrants..........................................................         17
Description of Preferred Stock.........................................................         22
Description of Capital Stock...........................................................         24
Description of Depositary Shares.......................................................         34
Plan of Distribution...................................................................         37
ERISA Matters..........................................................................         38
Legal Matters..........................................................................         39
Experts................................................................................         39
Available Information..................................................................         40
Incorporation of Certain Documents by Reference........................................         41

 
                                      S-2

                         IMPORTANT CURRENCY INFORMATION
 
    Purchasers are required to pay for each Note (as defined below) in the
currency designated by Citigroup Inc. (formerly Travelers Group Inc.)
("Citigroup" or the "Company") for such Note (the "Specified Currency"). If
requested by a prospective purchaser of a Note having a Specified Currency other
than U.S. dollars, the Agent may at its discretion arrange for the exchange of
U.S. dollars into such Specified Currency to enable the purchaser to pay for
such Note. Each such exchange will be made by the Agent on such terms and
subject to such conditions, limitations and charges as the Agent may from time
to time establish in accordance with its regular foreign exchange practice. All
costs of exchange will be borne by the purchaser.
 
    References herein to "U.S. dollars," "U.S.$," "dollar" or "$" are to the
lawful currency of the United States.
 
                              DESCRIPTION OF NOTES
 
    The following description of the particular terms of the Medium-Term Senior
Notes, Series A (the "Senior Notes") and Medium-Term Subordinated Notes, Series
A (the "Subordinated Notes" and, together with the Senior Notes, the "Notes")
supplements, and to the extent inconsistent therewith replaces, the description
of the general terms and provisions of the Debt Securities set forth in the
Prospectus, to which description reference is hereby made. The pricing
supplement (the "Pricing Supplement") for each offering of Notes will contain
the specific information and terms for that offering. The Pricing Supplement may
also add, update or change information contained in the Prospectus and this
Prospectus Supplement. It is important for you to consider the information
contained in the Prospectus, this Prospectus Supplement and the Pricing
Supplement in making your investment decision.
 
GENERAL
 
    The Company's Senior Notes are a series of Senior Debt Securities issued
under the Senior Debt Indenture, and the Company's Subordinated Notes are a
series of Subordinated Debt Securities issued under the Subordinated Debt
Indenture. At the date of this Prospectus Supplement, the Notes offered pursuant
to this Prospectus Supplement are limited to an aggregate initial public
offering price or purchase price of up to $6,000,000,000 or the equivalent
thereof in one or more foreign or composite currencies, which amount is subject
to reduction as a result of the sale of other securities under the registration
statement of which this Prospectus Supplement and the accompanying Prospectus
form a part or under a registration statement to which this Prospectus
Supplement and the accompanying Prospectus relate. The amount of Notes sold of
either series will reduce the amount of Notes of the other series that may be
sold. The Company reserves the right to withdraw, cancel or modify the offer
made hereby without notice. The aggregate amount of Notes may be increased from
time to time to such larger amount as may be authorized by the Company. The U.S.
dollar equivalent of the public offering price or purchase price of a Note
having a Specified Currency other than U.S. dollars will be determined on the
basis of the noon buying rate in New York City for cable transfers in foreign
currencies as certified for customs purposes by the Federal Reserve Bank of New
York (the "Market Exchange Rate") for such Specified Currency on the applicable
issue date. Such determination will be made by the Company or its agent, as
exchange rate agent for the applicable series of Notes (the "Exchange Rate
Agent").
 
    The Senior Notes will constitute part of the Senior Indebtedness of the
Company and will rank PARI PASSU with all other unsecured debt of the Company
except subordinated debt. The Subordinated Notes will be subordinate and junior
in the right of payment, to the extent and in the manner set forth in the
Subordinated Debt Indenture, to all Senior Indebtedness of the Company. See
"Description of Debt Securities--Subordinated Debt" in the Prospectus. On a
consolidated basis, after giving effect to
 
                                      S-3

the merger of Citicorp into a newly formed, wholly owned subsidiary of the
Company as of September 30, 1998, the aggregate principal amount of Senior
Indebtedness of the Company outstanding was approximately $78.1 billion,
consisting of the following: approximately $42.5 billion of term debt,
approximately $21.2 billion of commercial paper and approximately $14.4 billion
of other short-term borrowings.
 
    The Notes will be issued in fully registered form only, without coupons.
Each Note will be issued initially as either a Global Security registered in the
name of a nominee of The Depository Trust Company, as Depositary, or such other
depositary as is stated in the Pricing Supplement, (a "Book-Entry Note") or, if
specified in the applicable pricing supplement to this Prospectus Supplement (a
"Pricing Supplement"), a certificate issued in temporary or definitive form (a
"Certificated Note"). Except as set forth in the Prospectus under "Description
of Debt Securities--Global Securities," Book-Entry Notes will not be issuable as
Certificated Notes. See "Book-Entry System" below.
 
    Unless otherwise specified in the applicable Pricing Supplement, the
authorized denominations of Notes denominated in U.S. dollars will be $1,000 and
any larger amount that is an integral multiple of $1,000, and the authorized
denominations of Notes having a Specified Currency other than U.S. dollars will
be the approximate equivalents thereof in the Specified Currency.
 
    Unless otherwise specified in the applicable Pricing Supplement, each Note
will mature on a Business Day more than nine months from its date of issue, as
selected by the purchaser and agreed to by the Company (the "Stated Maturity"),
which maturity date may be subject to extension at the option of the Company.
Each Note may also be subject to redemption at the option of the Company, or to
repayment at the option of the Holder, prior to its Stated Maturity. Each Note
having a Specified Currency of Pounds Sterling will mature in compliance with
such regulations as the Bank of England may promulgate from time to time.
 
    The Pricing Supplement relating to a Note will describe the following terms:
(i) the Specified Currency for such Note; (ii) whether such Note bears interest
at a fixed rate (a "Fixed Rate Note") (which rate may be zero in the case of
certain OID Notes, as defined below), a floating rate (a "Floating Rate Note"),
and/or is an amortizing note on which a portion or all the principal amount is
payable prior to Stated Maturity in accordance with a schedule, by application
of a formula, or by reference to an index (an "Amortizing Note") and/or is an
indexed note (an "Indexed Note") on which the amount of any interest payment, in
the case of an Indexed Rate Note (as defined below), and/or the principal amount
payable at maturity, in the case of an Indexed Principal Note (as defined
below), will be determined by reference to the level of prices, or changes in
prices, or differences between prices, of securities, currencies, intangibles,
goods, articles or commodities or by application of a formula; (iii) the price
(expressed as a percentage of the aggregate principal amount or face amount
thereof) at which such Note will be issued (the "Issue Price"); (iv) the date on
which such Note will be issued (the "Original Issue Date"); (v) the date of the
Stated Maturity; (vi) if such Note is a Fixed Rate Note, the rate per annum at
which such Note will bear interest, if any, and whether and the manner in which
such rate may be changed prior to its Stated Maturity; (vii) if such Note is a
Floating Rate Note, the Base Rate, the Initial Interest Rate, the Interest Reset
Period or the Interest Reset Dates, the Interest Payment Dates, and, if
applicable, the Index Maturity, the Maximum Interest Rate, the Minimum Interest
Rate, the Spread or Spread Multiplier (all as defined below), and any other
terms relating to the particular method of calculating the interest rate for
such Note and whether and the manner in which such Spread or Spread Multiplier
may be changed prior to Stated Maturity; (viii) whether such Note is an OID Note
(as defined below); (ix) if such Note is an Amortizing Note, the terms for
repayment prior to Stated Maturity; (x) if such Note is an Indexed Note, in the
case of an Indexed Rate Note, the manner in which the amount of any interest
payment will be determined or, in the case of an Indexed Principal Note, its
Face Amount (as defined below) and the manner in which the principal amount
payable at Stated Maturity will be determined; (xi) whether such Note may be
redeemed at the option of the Company, or repaid at the option of the Holder,
prior to Stated
 
                                      S-4

Maturity as described under "Optional Redemption, Repayment and Repurchase"
below and, if so, the provisions relating to such redemption or repayment,
including, in the case of an OID Note or Indexed Note, the information necessary
to determine the amount due upon redemption or repayment; (xii) whether such
Note is subject to an optional extension beyond its Stated Maturity as described
under "Extension of Maturity" below; (xiii) whether such Note will be
represented by a Global Security or a certificate issued in definitive form;
(xiv) certain special United States federal income tax consequences of the
purchase, ownership and disposition of certain Notes, if any; (xv) whether such
Note is a Renewable Note (as defined below), and, if so, the specific terms
thereof; (xvi) the use of proceeds, if such use materially differs from that
disclosed in the accompanying Prospectus; and (xvii) any other terms of such
Note provided in the accompanying Prospectus to be set forth in a Pricing
Supplement or otherwise not inconsistent with the provisions of the Indenture
under which such Note will be issued.
 
    "Business Day" with respect to any Note means any day, other than a Saturday
or Sunday, that is (i) not a day on which banking institutions are authorized or
required by law or regulation to be closed in (a) The City of New York or (b) if
the Specified Currency for such Note is other than U.S. dollars, the financial
center of the country issuing such Specified Currency (which, in the case of the
Euro, shall be Brussels, Belgium) and (ii) if such Note is a LIBOR Note (as
defined below), a London Banking Day. "London Banking Day" with respect to any
Note means any day on which dealings in deposits in the Specified Currency of
such Note are transacted in the London interbank market.
 
    "OID Note" is defined under "Certain United States Federal Income Tax
Considerations--United States Holders--Original Issue Discount."
 
    A "basis point" or "bp" equals one one-hundredth of a percentage point.
 
PAYMENT OF PRINCIPAL AND INTEREST
 
    The principal of and any premium and interest on each Note are payable by
the Company in the Specified Currency for such Note. If the Specified Currency
for a Note is other than U.S. dollars, the Company will (unless otherwise
specified in the applicable Pricing Supplement) arrange to convert all payments
in respect of such Note into U.S. dollars in the manner described in the
following paragraph. The Holder of a Note having a Specified Currency other than
U.S. dollars may (if the applicable Pricing Supplement and such Note so
indicate) elect to receive all payments in respect of such Note in the Specified
Currency by delivery of a written notice to the Trustee for such Note not later
than fifteen calendar days prior to the applicable payment date, except under
the circumstances described under "Currency Risks--Payment Currency" below. Such
election will remain in effect until revoked by written notice to such Trustee
received not later than fifteen calendar days prior to the applicable payment
date and no such change of election may be made with respect to payments on any
Note with respect to which (i) an Event of Default has occurred or (ii) the
Company has given notice of redemption.
 
    In the case of a Note having a Specified Currency other than U.S. dollars,
the amount of any U.S. dollar payment in respect of such Note will be determined
by the Exchange Rate Agent based on the highest firm bid quotation expressed in
U.S. dollars received by the Exchange Rate Agent at approximately 11:00 a.m.,
New York City time, on the second Business Day preceding the applicable payment
date (or, if no such rate is quoted on such date, the last date on which such
rate was quoted), from three (or, if three are not available, then two)
recognized foreign exchange dealers in The City of New York (one or more of
which may be the Agent (as defined herein) and another of which may be the
Exchange Rate Agent) selected by the Exchange Rate Agent, for the purchase by
the quoting dealer, for settlement on such payment date, of the aggregate amount
of such Specified Currency payable on such payment date in respect of all Notes
denominated in such Specified Currency. All currency exchange costs will be
borne by the Holders of such Notes by deductions from such payments. If no such
bid quotations are available, such payments will be made in such Specified
Currency, unless such
 
                                      S-5

Specified Currency is unavailable due to the imposition of exchange controls or
to other circumstances beyond the Company's control, in which case such payments
will be made as described under "Currency Risks--Payment Currency" below.
 
    Unless otherwise specified in the applicable Pricing Supplement, U.S. dollar
payments of interest on Notes (other than interest payable at Stated Maturity)
will be made, except as provided below, by check mailed to the registered
Holders of such Notes (which, in the case of Global Securities representing
Book-Entry Notes, will be a nominee of the Depositary); PROVIDED, HOWEVER, that,
in the case of a Note issued between a Regular Record Date and the related
Interest Payment Date, unless otherwise specified in the related Pricing
Supplement, interest for the period beginning on the Original Issue Date for
such Note and ending on such Interest Payment Date shall be paid on the next
succeeding Interest Payment Date to the registered Holder of such Note on the
related Regular Record Date. A Holder of $10,000,000 (or the equivalent thereof
in a Specified Currency other than U.S. dollars) or more in aggregate principal
amount of Notes of like tenor and term shall be entitled to receive such U.S.
dollar payments by wire transfer of immediately available funds, but only if
appropriate wire transfer instructions have been received in writing by the
Trustee for such Notes not later than fifteen calendar days prior to the
applicable Interest Payment Date. Simultaneously with the election by any Holder
to receive payments in a Specified Currency other than U.S. dollars (as provided
above), such Holder shall provide appropriate wire transfer instructions to the
Trustee for such Notes. Unless otherwise specified in the applicable Pricing
Supplement, principal and any premium and interest payable at the Stated
Maturity of a Note will be paid in immediately available funds upon surrender of
such Note at the corporate trust office or agency of the Trustee for such Note
in The City of New York.
 
    Unless otherwise specified in this Prospectus Supplement or the applicable
Pricing Supplement, any payment required to be made in respect of a Note on a
date (including the day of Stated Maturity) that is not a Business Day for such
Note need not be made on such date, but may be made on the next succeeding
Business Day with the same force and effect as if made on such date, and no
additional interest shall accrue as a result of such delayed payment.
 
    Unless otherwise specified in the applicable Pricing Supplement, if the
principal of any OID Note (other than an Indexed Note (as defined herein)) is
declared to be due and payable immediately as a result of the acceleration of
Stated Maturity, as described under "Description of Debt Securities-- Defaults"
in the Prospectus, the amount of principal due and payable with respect to such
Note shall be limited to the aggregate principal amount of such Note multiplied
by the sum of its Issue Price (expressed as a percentage of the aggregate
principal amount) plus the original issue discount amortized from the date of
issue to the date of declaration, which amortization shall be calculated using
the "interest method" (computed in accordance with generally accepted accounting
principles in effect on the date of declaration).
 
    The Regular Record Date with respect to any Interest Payment Date for a
Floating Rate Note, Fixed Rate Note or an Indexed Rate Note shall be the date
(whether or not a Business Day) fifteen calendar days immediately preceding such
Interest Payment Date.
 
FIXED RATE NOTES
 
    Each Fixed Rate Note will bear interest from its Original Issue Date, or
from the last Interest Payment Date to which interest has been paid or duly
provided for, at the rate per annum stated in the applicable Pricing Supplement
until the principal amount thereof is paid or made available for payment, except
as described below under "Subsequent Interest Periods" and "Extension of
Maturity," and except that if so specified in the applicable Pricing Supplement,
the rate of interest payable on certain Fixed Rate Notes may be subject to
adjustment from time to time as described in such Pricing Supplement. Unless
otherwise set forth in the applicable Pricing Supplement, interest on each Fixed
Rate Note will be payable semiannually in arrears on such dates as set forth in
the applicable Pricing
 
                                      S-6

Supplement (each such day being an "Interest Payment Date") and at Stated
Maturity. Unless otherwise specified in the applicable Pricing Supplement, if an
Interest Payment Date with respect to any Fixed Rate Note would otherwise be a
day that is not a Business Day, such Interest Payment Date shall not be
postponed; PROVIDED, HOWEVER, that any payment required to be made in respect of
such Note on a date (including the day of Stated Maturity) that is not a
Business Day for such Note need not be made on such date, but may be made on the
next succeeding Business Day with the same force and effect as if made on such
date, and no additional interest shall accrue as a result of such delayed
payment. However, if with respect to any Fixed Rate Note, "Accrue to Pay" is
specified in the applicable Pricing Supplement, and any Interest Payment Date
with respect to such Fixed Rate Note would otherwise be a day that is not a
Business Day, such Interest Payment Date shall be postponed to the next
succeeding Business Day. Each payment of interest in respect of an Interest
Payment Date shall include interest accrued through the day before such Interest
Payment Date. Unless otherwise specified in the applicable Pricing Supplement,
interest on Fixed Rate Notes will be computed on the basis of a 360-day year of
twelve 30-day months ("30 over 360") or, in the case of an incomplete month, the
number of days elapsed.
 
FLOATING RATE NOTES
 
    From its Original Issue Date to, but not including, the first Interest Reset
Date (as defined below) (the period hereinafter called the "Initial Interest
Period"), each Floating Rate Note will bear interest at the Initial Interest
Rate set forth, or otherwise described, in the Pricing Supplement. From each
Interest Reset Date to, but not including, the following Interest Reset Date
(each such period, an "Interest Reset Period," and together with the Initial
Interest Period, the "Interest Periods"), the interest rate for each Floating
Rate Note will be determined by reference to an interest rate basis (the "Base
Rate"), plus or minus the Spread (as defined below), if any, or multiplied by
the Spread Multiplier (as defined below), if any. The "Spread" is the number of
basis points that may be specified in the applicable Pricing Supplement as being
applicable to such Note, and the "Spread Multiplier" is the percentage that may
be specified in the applicable Pricing Supplement as being applicable to such
Note, except in each case as described below under "Subsequent Interest Periods"
and "Extension of Maturity," and except that if so specified in the applicable
Pricing Supplement, the Spread or Spread Multiplier on certain Floating Rate
Notes may be subject to adjustment from time to time as described in such
Pricing Supplement. The applicable Pricing Supplement will designate one of the
following Base Rates as applicable to a Floating Rate Note: (i) LIBOR (a "LIBOR
Note"), (ii) the Commercial Paper Rate (a "Commercial Paper Rate Note"), (iii)
the Treasury Rate (a "Treasury Rate Note"), (iv) the Federal Funds Rate (a
"Federal Funds Rate Note"), (v) the CD Rate (a "CD Rate Note"), (vi) the Prime
Rate (a "Prime Rate Note"), (vii) the J.J. Kenny Rate (a "J.J. Kenny Rate
Note"), (viii) the Eleventh District Cost of Funds Rate (an "Eleventh District
Cost of Funds Rate Note"), or (ix) such other Base Rate as is set forth in such
Pricing Supplement and in such Note. The "Index Maturity" for any Floating Rate
Note is the period of maturity of the instrument or obligation from which the
Base Rate is calculated. "H.15(519)" means the publication entitled "Statistical
Release H.15(519), Selected Interest Rates," or any successor publication,
published by the Board of Governors of the Federal Reserve System. "Composite
Quotations" means the daily statistical release entitled "Composite 3:30 p.m.
Quotations for U.S. Government Securities" published by the Federal Reserve Bank
of New York.
 
    As specified in the applicable Pricing Supplement, a Floating Rate Note may
also have either or both of the following (in each case expressed as a rate per
annum on a simple interest basis): (i) a maximum limitation, or ceiling, on the
rate at which interest may accrue during any interest period ("Maximum Interest
Rate") and (ii) a minimum limitation, or floor, on the rate at which interest
may accrue during any interest period ("Minimum Interest Rate"). In addition to
any Maximum Interest Rate that may be applicable to any Floating Rate Note, the
interest rate on a Floating Rate Note will in no event be higher than the
maximum rate permitted by applicable law, as the same may be
 
                                      S-7

modified by United States law of general application. The Notes will be governed
by the law of the State of New York and, under such law as of the date of this
Prospectus Supplement, the maximum rate of interest under provisions of the
penal law, with certain exceptions, is 25% per annum on a simple interest basis.
Such maximum rate of interest only applies to obligations that are less than
$2,500,000.
 
    The Company will appoint and enter into agreements with agents (each a
"Calculation Agent") to calculate interest rates on Floating Rate Notes. Unless
otherwise specified in a Pricing Supplement, The Bank of New York will be the
Calculation Agent for each Senior Note that is a Floating Rate Note and The
First National Bank of Chicago will be the Calculation Agent for each
Subordinated Note that is a Floating Rate Note. All determinations of interest
by the Calculation Agent shall, in the absence of manifest error, be conclusive
for all purposes and binding on the holders of the Floating Rate Notes.
 
    The interest rate on each Floating Rate Note will be reset daily, weekly,
monthly, quarterly, semiannually or annually (each day on which the interest
rate is reset, an "Interest Reset Date"), as specified in the applicable Pricing
Supplement. Unless otherwise specified in the applicable Pricing Supplement, the
Interest Reset Dates will be, in the case of Floating Rate Notes that reset
daily, each Business Day; in the case of Floating Rate Notes (other than
Treasury Rate Notes) that reset weekly, Wednesday of each week; in the case of
Treasury Rate Notes that reset weekly, Tuesday of each week (except as provided
below under "Treasury Rate Notes"); in the case of Floating Rate Notes that
reset monthly, the third Wednesday of each month (with the exception of monthly
reset Eleventh District Cost of Funds Rate Notes, which reset on the first
calendar day of each month); in the case of Floating Rate Notes that reset
quarterly, the third Wednesday of March, June, September and December of each
year; in the case of Floating Rate Notes that reset semiannually, the third
Wednesday of each of two months of each year specified in the applicable Pricing
Supplement; and, in the case of Floating Rate Notes that reset annually, the
third Wednesday of one month of each year specified in the applicable Pricing
Supplement. If an Interest Reset Date for any Floating Rate Note would otherwise
be a day that is not a Business Day, such Interest Reset Date shall be postponed
to the next succeeding Business Day, except that, in the case of a LIBOR Note,
if such Business Day is in the next succeeding calendar month, such Interest
Reset Date shall be the immediately preceding Business Day. If an auction of
direct obligations of United States Treasury Bills ("Treasury bills") falls on a
day that is an Interest Reset Date for Treasury Rate Notes, the Interest Reset
Date shall be the succeeding Business Day.
 
    Unless otherwise specified in the applicable Pricing Supplement and except
as set forth in the next sentence, the rate of interest that goes into effect on
any Interest Reset Date shall be determined on a date (the "Rate Determination
Date") preceding such Interest Reset Date, as further described below. Such Rate
Determination Date may be referred to below as a "CD Rate Determination Date" in
the case of a CD Rate Note, a "Commercial Paper Rate Determination Date" in the
case of a Commercial Paper Rate Note, a "Federal Funds Rate Determination Date"
in the case of a Federal Funds Rate Note, a "LIBOR Determination Date" in the
case of a LIBOR Note, a "Treasury Rate Determination Date" or a "Constant
Maturity Treasury Rate Determination Date" in the case of a Treasury Rate Note,
a "Prime Rate Determination Date" in the case of a Prime Rate Note, a "J.J.
Kenny Rate Determination Date" in the case of a J.J. Kenny Rate Note, or an
"Eleventh District Cost of Funds Rate Date" in the case of an Eleventh District
Cost of Funds Rate Note.
 
    Unless otherwise specified in the applicable Pricing Supplement, interest
payable in respect of Floating Rate Notes shall be the interest accrued from and
including the Original Issue Date or the last date to which interest has been
paid, as the case may be, to but excluding the applicable Interest Payment Date.
In the case of a Floating Rate Note that resets daily or weekly, interest
payable shall be the interest accrued from and including the Original Issue Date
or the last date to which interest has been accrued and paid, as the case may
be, to but excluding the Record Date immediately preceding
 
                                      S-8

the applicable Interest Payment Date, except that, at Stated Maturity, interest
payable will include interest accrued to but excluding the date of Stated
Maturity.
 
    With respect to a Floating Rate Note with more than one Interest Reset Date
during any period for which accrued interest is being calculated, accrued
interest shall be calculated by multiplying the principal amount of such Note
(or, in the case of a Floating Rate Note that is an Indexed Principal Note, its
Face Amount, as indicated in the applicable Pricing Supplement) by an accrued
interest factor. Such accrued interest factor will be computed by adding the
interest factors calculated for each day in the period for which accrued
interest is being calculated. The interest factor (expressed as a decimal
calculated to seven decimal places without rounding) for each such day is
computed, unless otherwise specified in the applicable Pricing Supplement, by
dividing the interest rate in effect on such day by 360 ("Actual over 360"), in
the case of LIBOR Notes, Prime Rate Notes, J.J. Kenny Rate Notes, Eleventh
District Cost of Funds Rate Notes, Commercial Paper Rate Notes, Federal Funds
Rate Notes and CD Rate Notes, or by the actual number of days in the year
("Actual over Actual"), in the case of Treasury Rate Notes. For purposes of
making the foregoing calculation, the interest rate in effect on any Interest
Reset Date will be the applicable rate as reset on such date. With respect to
all other Floating Rate Notes, accrued interest shall be calculated by
multiplying the principal amount of such Note (or, in the case of a Floating
Rate Note that is an Indexed Principal Note, its Face Amount) by the interest
rate in effect during the period for which accrued interest is being calculated,
and multiplying that product by the quotient obtained by dividing the number of
days in the period for which accrued interest is being calculated by 360, in the
case of LIBOR Notes, Prime Rate Notes, J.J. Kenny Rate Notes, Eleventh District
Cost of Funds Rate Notes, Commercial Paper Rate Notes, Federal Funds Rate Notes
and CD Rate Notes, or by the actual number of days in the year, in the case of
Treasury Rate Notes.
 
    Unless otherwise specified in the applicable Pricing Supplement, all
percentages resulting from any calculation of the rate of interest on a Floating
Rate Note will be rounded, if necessary, to the nearest 1/100,000 of 1%
(.0000001), with five one-millionths of a percentage point rounded upward, and
all currency amounts used in or resulting from such calculation on Floating Rate
Notes will be rounded to the nearest one-hundredth of a unit (with .005 of a
unit being rounded upward).
 
    Unless otherwise indicated in the applicable Pricing Supplement and except
as provided below, interest will be payable, in the case of Floating Rate Notes
that reset daily, weekly or monthly (other than Eleventh District Cost of Funds
Rate Notes), on the third Wednesday of each month or on the third Wednesday of
March, June, September and December of each year, as specified in the applicable
Pricing Supplement or, in the case of Eleventh District Cost of Funds Rate
Notes, on the first calendar day of each March, June, September and December, as
specified in the applicable Pricing Supplement; in the case of Floating Rate
Notes that reset quarterly, on the third Wednesday of March, June, September,
and December of each year; in the case of Floating Rate Notes that reset
semiannually, on the third Wednesday of each of two months of each year
specified in the applicable Pricing Supplement; and, in the case of Floating
Rate Notes that reset annually, on the third Wednesday of one month of each year
specified in the applicable Pricing Supplement, and in each case at Maturity
(each such day being an "Interest Payment Date"). If an Interest Payment Date
with respect to any Floating Rate Note would otherwise be a day that is not a
Business Day, such Interest Payment Date shall be postponed to the next
succeeding Business Day, except that, in the case of a LIBOR Note, if such
Business Day is in the next succeeding calendar month, such Interest Payment
Date shall be the immediately preceding Business Day; PROVIDED, HOWEVER, if with
respect to any Floating Rate Note, the applicable Pricing Supplement provides
that the Note does not accrue to pay, if an Interest Payment Date with respect
to such Floating Rate Note would otherwise be a day that is not a Business Day,
such Interest Payment Date shall not be postponed; PROVIDED, FURTHER, that any
payment required to be made in respect of a Floating Rate Note that does not
accrue to pay on a date (including the day of Stated Maturity) that is not a
Business Day for such Note need not be made on such date, but may be
 
                                      S-9

made on the next succeeding Business Day with the same force and effect as if
made on such dates, and no additional interest shall accrue as a result of such
delayed payment.
 
    Upon the request of the Holder of any Floating Rate Note, the Calculation
Agent for such Note will provide the interest rate then in effect and, if
determined, the interest rate that will become effective on the next Interest
Reset Date with respect to such Floating Rate Note.
 
CD RATE NOTES
 
    Each CD Rate Note will bear interest for each Interest Reset Period at the
interest rate calculated with reference to the CD Rate and the Spread or Spread
Multiplier, if any, specified in such Note and in the applicable Pricing
Supplement.
 
    Unless otherwise specified in the applicable Pricing Supplement, the "CD
Rate" for each Interest Reset Period shall be the rate as of the second Business
Day prior to the Interest Reset Date for such Interest Reset Period (a "CD Rate
Determination Date") for negotiable certificates of deposit having the Index
Maturity designated in the applicable Pricing Supplement as published in
H.15(519) under the heading "CDs (Secondary Market)." In the event that such
rate is not published prior to 3:00 p.m., New York City time, on the Calculation
Date (as defined below) pertaining to such CD Rate Determination Date, then the
"CD Rate" for such Interest Reset Period will be the rate on such CD Rate
Determination Date for negotiable certificates of deposit of the Index Maturity
designated in the applicable Pricing Supplement as published in Composite
Quotations under the heading "Certificates of Deposit." If by 3:00 p.m., New
York City time, on such Calculation Date such rate is not yet published in
either H.15(519) or Composite Quotations, then the "CD Rate" for such Interest
Reset Period will be calculated by the Calculation Agent for such CD Rate Note
and will be the arithmetic mean of the secondary market offered rates as of
10:00 a.m., New York City time, on such CD Rate Determination Date of three
leading nonbank dealers in negotiable U.S. dollar certificates of deposit in The
City of New York selected by the Calculation Agent for such CD Rate Note for
negotiable certificates of deposit of major United States money center banks of
the highest credit standing (in the market for negotiable certificates of
deposit) with a remaining maturity closest to the Index Maturity designated in
the Pricing Supplement in a denomination of $5,000,000; PROVIDED, HOWEVER, that
if the dealers selected as aforesaid by such Calculation Agent are not quoting
offered rates as mentioned in this sentence, the "CD Rate" for such Interest
Reset Period will be the same as the CD Rate for the immediately preceding
Interest Reset Period (or, if there was no such Interest Reset Period, the
Initial Interest Rate).
 
    The "Calculation Date" pertaining to any CD Rate Determination Date shall be
the tenth calendar day after such CD Rate Determination Date or, if such day is
not a Business Day, the next succeeding Business Day.
 
    CD Rate Notes, like other Notes, are not deposit obligations of a bank and
are not insured by the Federal Deposit Insurance Corporation.
 
COMMERCIAL PAPER RATE NOTES
 
    Each Commercial Paper Rate Note will bear interest for each Interest Reset
Period at the interest rate calculated with reference to the Commercial Paper
Rate and the Spread or Spread Multiplier, if any, specified in such Note and in
the applicable Pricing Supplement.
 
    Unless otherwise specified in the applicable Pricing Supplement, the
"Commercial Paper Rate" for each Interest Reset Period will be determined by the
Calculation Agent for such Commercial Paper Rate Note as of the second Business
Day prior to the Interest Reset Date for such Interest Reset Period (a
"Commercial Paper Rate Determination Date") and shall be the Money Market Yield
(as defined below) on such Commercial Paper Rate Determination Date of the rate
for commercial paper
 
                                      S-10

having the Index Maturity specified in the applicable Pricing Supplement, as
such rate shall be published in H.15(519) under the heading "Commercial Paper."
In the event that such rate is not published prior to 3:00 p.m., New York City
time, on the Calculation Date (as defined below) pertaining to such Commercial
Paper Rate Determination Date, then the "Commercial Paper Rate" for such
Interest Reset Period shall be the Money Market Yield on such Commercial Paper
Rate Determination Date of the rate for commercial paper of the specified Index
Maturity as published in Composite Quotations under the heading "Commercial
Paper." If by 3:00 p.m., New York City time, on such Calculation Date such rate
is not yet published in either H.15(519) or Composite Quotations, then the
"Commercial Paper Rate" for such Interest Reset Period shall be the Money Market
Yield of the arithmetic mean of the offered rates, as of 11:00 a.m., New York
City time, on such Commercial Paper Rate Determination Date of three leading
dealers of commercial paper in The City of New York selected by the Calculation
Agent for such Commercial Paper Rate Note for commercial paper of the specified
Index Maturity placed for an industrial issuer whose bonds are rated "AA" or the
equivalent by a nationally recognized rating agency; PROVIDED, HOWEVER, that if
the dealers selected as aforesaid by such Calculation Agent are not quoting
offered rates as mentioned in this sentence, the "Commercial Paper Rate" for
such Interest Reset Period will be the same as the Commercial Paper Rate for the
immediately preceding Interest Reset Period (or, if there was no such Interest
Reset Period, the Initial Interest Rate).
 
    "Money Market Yield" shall be a yield calculated in accordance with the
following formula:
 

                                                  
                                             DX360
                    Money Market Yield =  -----------   X100
                                           360-(DXM)

 
where "D" refers to the applicable per annum rate for commercial paper quoted on
a bank discount basis and expressed as a decimal, and "M" refers to the actual
number of days in the specified Index Maturity.
 
    The "Calculation Date" pertaining to any Commercial Paper Rate Determination
Date shall be the tenth calendar day after such Commercial Paper Rate
Determination Date or, if such day is not a Business Day, the next succeeding
Business Day.
 
FEDERAL FUNDS RATE NOTES
 
    Each Federal Funds Rate Note will bear interest for each Interest Reset
Period at the interest rate calculated with reference to the Federal Funds Rate
and the Spread or Spread Multiplier, if any, specified in such Note and in the
applicable Pricing Supplement.
 
    Unless otherwise specified in the applicable Pricing Supplement, the
"Federal Funds Rate" for each Interest Reset Period shall be the effective rate
on the Interest Reset Date for such Interest Reset Period (a "Federal Funds Rate
Determination Date") for Federal Funds as published in H.15(519) under the
heading "Federal Funds (Effective)." In the event that such rate is not
published prior to 3:00 p.m., New York City time, on the Calculation Date (as
defined below) pertaining to such Federal Funds Rate Determination Date, the
"Federal Funds Rate" for such Interest Reset Period shall be the rate on such
Federal Funds Rate Determination Date as published in Composite Quotations under
the heading "Federal Funds/Effective Rate." If by 3:00 p.m., New York City time,
on such Calculation Date such rate is not yet published in either H.15(519) or
Composite Quotations, then the "Federal Funds Rate" for such Interest Reset
Period shall be the rate on such Federal Funds Rate Determination Date made
publicly available by the Federal Reserve Bank of New York which is equivalent
to the rate which appears in H.15(519) under the heading "Federal Funds
(Effective);" PROVIDED, HOWEVER, that if such rate is not made publicly
available by the Federal Reserve Bank of New York by 3:00 p.m., New York City
time, on such Calculation Date, the "Federal Funds Rate" for such
 
                                      S-11

Interest Reset Period will be the same as the Federal Funds Rate in effect for
the immediately preceding Interest Reset Period (or, if there was no such
Interest Reset Period, the Initial Interest Rate). In the case of a Federal
Funds Rate Note that resets daily, the interest rate on such Note for the period
from and including a Monday to but excluding the succeeding Monday will be reset
by the Calculation Agent for such Note on such second Monday (or, if not a
Business Day, on the next succeeding Business Day) to a rate equal to the
average of the Federal Funds Rates in effect with respect to each such day in
such week.
 
    The "Calculation Date" pertaining to any Federal Funds Rate Determination
Date shall be the next succeeding Business Day.
 
LIBOR NOTES
 
    Each LIBOR Note will bear interest for each Interest Reset Period at the
interest rate calculated with reference to LIBOR and the Spread or Spread
Multiplier, if any, specified in such Note and in the applicable Pricing
Supplement.
 
    "LIBOR" for each Interest Reset Period will be determined by the Calculation
Agent for such LIBOR Notes as follows:
 
    (i) On the second London Banking Day prior to the Interest Reset Date for
        such Interest Reset Period (a "LIBOR Determination Date"), the
        Calculation Agent for such LIBOR Note will determine the offered rates
        for deposits in the Specified Currency for the period of the Index
        Maturity specified in the applicable Pricing Supplement, commencing on
        such Interest Reset Date, which appear on the Designated LIBOR Page at
        approximately 11:00 a.m., London time, on such LIBOR Determination Date.
        If "LIBOR Telerate" is designated in the applicable Pricing Supplement,
        "Designated LIBOR Page" means the display designated as page "3750" on
        the Bridge Telerate Service (or such other page as may replace page
        "3750" on such service or such other service as may be nominated by the
        British Bankers' Association for the purpose of displaying the London
        interbank offered rates of major banks), and LIBOR for such Interest
        Reset Period will be the relevant offered rate as determined by the
        Calculation Agent. If "LIBOR Reuters" is designated in the applicable
        Pricing Supplement, "Designated LIBOR Page" means the display designated
        as page "LIBO" on the Reuters Monitor Money Rates Service (or such other
        page as may replace the LIBO page on such service or such other service
        as may be nominated by the British Bankers' Association for the purpose
        of displaying London interbank offered rates of major banks) provided
        that at least two such offered rates appear on the Designated LIBOR
        Page, in which case, "LIBOR" for such Interest Reset Period will be the
        arithmetic mean of such offered rates as determined by the Calculation
        Agent for such LIBOR Note.
 
    (ii) If LIBOR cannot be determined as above (either because the Designated
         LIBOR Page is no longer available or because less than two rates appear
         on page "LIBO" on the Reuters Monitor Money Rate Services) on such
         LIBOR Determination Date, the Calculation Agent for such LIBOR Note
         will request the principal London offices of each of four major banks
         in the London interbank market selected by such Calculation Agent to
         provide such Calculation Agent with its offered quotations for deposits
         in the Specified Currency for the period of the specified Index
         Maturity, commencing on such Interest Reset Date, to prime banks in the
         London interbank market at approximately 11:00 a.m., London time, on
         such LIBOR Determination Date and in a principal amount equal to an
         amount of not less than $1,000,000 or the approximate equivalent
         thereof in the Specified Currency that is representative of a single
         transaction in such market at such time. If at least two such
         quotations are provided, "LIBOR" for such Interest Reset Period will be
         the arithmetic mean of such quotations. If fewer than two such
         quotations are provided, "LIBOR" for such Interest Reset Period will be
 
                                      S-12

         the arithmetic mean of rates quoted by three major banks in The City of
         New York selected by the Calculation Agent for such LIBOR Note at
         approximately 11:00 a.m., New York City time, on such LIBOR
         Determination Date for loans in the Specified Currency to leading
         European banks, for the period of the specified Index Maturity,
         commencing on such Interest Reset Date, and in a principal amount equal
         to an amount of not less than $1,000,000 or the approximate equivalent
         thereof in the Specified Currency that is representative of a single
         transaction in such market at such time; PROVIDED, HOWEVER, that if
         fewer than three banks selected as aforesaid by such Calculation Agent
         are quoting rates as mentioned in this sentence, "LIBOR" for such
         Interest Reset Period will be the same as LIBOR for the immediately
         preceding Interest Reset Period (or, if there was no such Interest
         Reset Period, the Initial Interest Rate).
 
TREASURY RATE NOTES
 
    Each Treasury Rate Note will bear interest for each Interest Reset Period at
the interest rate calculated with reference to the Treasury Rate and the Spread
or Spread Multiplier, if any, specified in such Note and in the applicable
Pricing Supplement.
 
    Unless "Constant Maturity" is specified or unless otherwise specified in the
applicable Pricing Supplement, the "Treasury Rate" for each Interest Reset
Period will be the rate for the auction held on the Treasury Rate Determination
Date (as defined below) for such Interest Reset Period of direct obligations of
the United States ("Treasury securities") having the Index Maturity specified in
the applicable Pricing Supplement, as such rate shall be published in H.15(519)
under the heading "U.S. Government Securities-Treasury bills-auction average
(investment)" or, in the event that such rate is not published prior to 3:00
p.m., New York City time, on the Calculation Date (as defined below) pertaining
to such Treasury Rate Determination Date, the auction average rate (expressed as
a bond equivalent on the basis of a year of 365 or 366 days, as applicable, and
applied on a daily basis) on such Treasury Rate Determination Date as otherwise
announced by the United States Department of the Treasury. In the event that the
results of the auction of Treasury securities having the specified Index
Maturity are not published or reported as provided above by 3:00 p.m., New York
City time, on such Calculation Date, or if no such auction is held on such
Treasury Rate Determination Date, then the "Treasury Rate" for such Interest
Reset Period shall be calculated by the Calculation Agent for such Treasury Rate
Note and shall be a yield to maturity (expressed as a bond equivalent on the
basis of a year of 365 or 366 days, as applicable, and applied on a daily basis)
of the arithmetic mean of the secondary market bid rates, as of approximately
3:30 p.m., New York City time, on such Treasury Rate Determination Date, of
three leading primary United States government securities dealers selected by
such Calculation Agent for the issue of Treasury securities with a remaining
maturity closest to the specified Index Maturity; provided, however, that if the
dealers selected as aforesaid by such Calculation Agent are not quoting bid
rates as mentioned in this sentence, then the "Treasury Rate" for such Interest
Reset Period will be the same as the Treasury Rate for the immediately preceding
Interest Reset Period (or, if there was no such Interest Reset Period, the
Initial Interest Rate).
 
    The "Treasury Rate Determination Date" for each Interest Reset Period will
be the day of the week in which the Interest Reset Date for such Interest Reset
Period falls on which Treasury securities would normally be auctioned. Treasury
securities are normally sold at auction on Monday of each week, unless that day
is a legal holiday, in which case the auction is normally held on the following
Tuesday, except that such auction may be held on the preceding Friday. If, as
the result of a legal holiday, an auction is so held on the preceding Friday,
such Friday will be the Treasury Rate Determination Date pertaining to the
Interest Reset Period commencing in the next succeeding week. If an auction date
shall fall on any day that would otherwise be an Interest Reset Date for a
Treasury Rate Note, then such Interest Reset Date shall instead be the Business
Day immediately following such auction date.
 
                                      S-13

    If "Constant Maturity" is specified in the applicable Pricing Supplement,
the "Treasury Rate" for each Interest Reset Period will be the rate that is set
forth in the Federal Reserve Board publication H.15(519) opposite the caption
"U.S. Government/Securities/Treasury Constant Maturities/" in the Index Maturity
with respect to the applicable Constant Maturity Treasury Rate Determination
Date (as defined below). If the H.15(519) is not published, the Treasury Rate
shall be the rate that was set forth on Telerate Page 7055, or its successor
page (as determined by the Calculation Agent), on the applicable Constant
Maturity Treasury Rate Determination Date opposite the applicable Index
Maturity. If no such rate is set forth, then the Treasury Rate for such Interest
Reset Period shall be established by the Calculation Agent as follows: the
Calculation Agent will contact the Federal Reserve Board and request the
Treasury Rate, in the applicable Index Maturity, for the Constant Maturity
Treasury Rate Determination Date. If the Federal Reserve Board does not provide
such information, then the Treasury Rate for such Interest Reset Date will be
the arithmetic mean of bid-side quotations, expressed in terms of yield,
reported by three leading U.S. government securities dealers (one or more of
which may be an Agent (as defined herein)), according to their written records,
as of 3:00 p.m. (New York City time) on the Constant Maturity Treasury Rate
Determination Date, for the noncallable U.S. Treasury Note that is nearest in
maturity to the Index Maturity, but not less than exactly the Index Maturity and
for the noncallable U.S. Treasury Note that is nearest in maturity to the Index
Maturity, but not more than exactly the Index Maturity. The Calculation Agent
shall calculate the Treasury Rate by interpolating to the Index Maturity based
on an actual/actual date count basis, the yield on the two Treasury Notes
selected. If the Calculation Agent cannot obtain three such adjusted quotations,
the Treasury Rate for such Interest Reset Date will be the arithmetic mean of
all such quotations, or if only one such quotation is obtained, such quotation,
obtained by the Calculation Agent. In all events, the Calculation Agent shall
continue polling dealers until at least one adjusted yield quotation can be
determined.
 
    "The Constant Maturity Treasury Rate Determination Date" shall be the tenth
Business Day prior to the Interest Reset Date for the applicable Interest Reset
Period.
 
    The Treasury constant maturity rate for a Treasury security maturity (the
"CMT Rate") as published in H.15(519) as of any Business Day is intended to be
indicative of the yield of a U.S. Treasury security having as of such Business
Day a remaining term to maturity equivalent to such maturity. The CMT Rate as of
any Business Day is based upon an interpolation by the U.S. Treasury of the
daily yield curve of outstanding Treasury securities. This yield curve, which
relates the yield on a security to its time to maturity, is based on the
over-the-counter market bid yields on actively traded Treasury securities. Such
yields are calculated from composites of quotations reported by leading U.S.
government securities dealers, which may include one or more of the Calculation
Agents or other affiliates of the Company. Certain constant maturity yield
values are read from the yield curve. Such interpolation from the yield curve
provides a theoretical yield for a Treasury security having ten years to
maturity, for example, even if no outstanding Treasury security has as of such
date exactly ten years remaining to maturity.
 
    The "Calculation Date" pertaining to any Treasury Rate Determination Date or
Constant Maturity Treasury Rate Determination Date, as applicable, shall be the
tenth calendar day after such Treasury Rate Determination Date or Constant
Maturity Rate Determination Date, as applicable, or, if such a day is not a
Business Day, the next succeeding Business Day.
 
PRIME RATE NOTES
 
    Prime Rate Notes will bear interest at the interest rates (calculated with
reference to the Prime Rate and the Spread or Spread Multiplier, if any)
specified in the Prime Rate Notes and in the applicable Pricing Supplement.
 
                                      S-14

    Unless otherwise indicated in the applicable Pricing Supplement, the "Prime
Rate" for each Interest Reset Period will be determined by the Calculation Agent
for such Prime Rate Note as of the second Business Day prior to the Interest
Reset Date for such Interest Reset Period (a "Prime Rate Determination Date")
and shall be the rate made available and subsequently published on such date in
H.15(519) under the heading "Bank Prime Loan." In the event that such rate has
not been made available prior to 3:00 P.M., New York City time, on the
Calculation Date (as defined below) pertaining to such Prime Rate Determination
Date, the Prime Rate will be calculated by the Calculation Agent and will be the
arithmetic mean of the rates of interest publicly announced by each bank that
appears on the Reuters Screen NYMF Page (as defined below) as such bank's prime
rate or base lending rate as in effect for such Prime Rate Determination Date.
If fewer than four such rates but more than one such rate appear on the Reuters
Screen NYMF Page for the Prime Rate Determination Date, the rate shall be the
arithmetic mean of the prime rates quoted on the basis of the actual number of
days in the year divided by 360 as of the close of business on such Prime Rate
Determination Date by four major money center banks in The City of New York
selected by the Calculation Agent. If fewer than two such rates appear on the
Reuters Screen NYMF Page, the Prime Rate will be calculated by the Calculation
Agent and will be the arithmetic mean of the prime rates quoted in The City of
New York on such Prime Rate Determination Date by at least three substitute
banks or trust companies organized and doing business under the laws of the
United States, or any State thereof, having total equity capital of at least
U.S. $500,000,000 and being subject to supervision or examination by Federal or
State authority, selected by the Calculation Agent to provide such rate or
rates; PROVIDED, HOWEVER, that if the banks or trust companies selected as
aforesaid by the Calculation Agent are not quoting as mentioned in this
sentence, the Prime Rate with respect to such Prime Rate Determination Date will
be the Prime Rate in effect on such Prime Rate Determination Date. "Reuters
Screen NYMF Page" means the display designated as page "NYMF" on the Reuters
Monitor Money Rates Service (or such other page as may replace the NYMF page on
that service for the purpose of displaying prime rates or base lending rates of
major United States banks).
 
    The "Calculation Date" pertaining to any Prime Rate Determination Date shall
be the tenth calendar day after such Prime Rate Determination Date or, if such
day is not a Business Day, the next succeeding Business Day.
 
J.J. KENNY RATE NOTES
 
    J.J. Kenny Rate Notes will bear interest at the interest rates (calculated
by reference to the J.J. Kenny Rate and the Spread and/or Spread Multiplier, if
any) specified in the J.J. Kenny Rate Notes and in the applicable Pricing
Supplement.
 
    Unless otherwise indicated in an applicable Pricing Supplement, the "J.J.
Kenny Rate" for each Interest Reset Period will be determined by the Calculation
Agent for such J.J. Kenny Rate Note as of the second Business Day prior to the
Interest Reset Date for such Interest Reset Period (a "J.J. Kenny Rate
Determination Date") and shall be the per annum rate on such date equal to the
index made available and subsequently published by Kenny Information Systems or
its successor, based upon 30-day yield evaluations at par of bonds, the interest
on which is excludable from gross income for federal income tax purposes under
the Internal Revenue Code of 1986, as amended (the "Code"), of not less than
five "high grade" component issuers selected from time to time by Kenny
Information Systems, including without limitation, issuers of general obligation
bonds; PROVIDED, HOWEVER, that the bonds on which the index is based shall not
include any bonds the interest on which is subject to an "alternate minimum tax"
or similar tax under the Code, unless all tax-exempt bonds are subject to such
tax. If such rate is not made available by 3:00 P.M., New York City time, on the
Calculation Date (as defined below) pertaining to such J.J. Kenny Rate
Determination Date, the J.J. Kenny Rate shall be the rate quoted by a successor
indexing agent selected by the Company equaling the prevailing rate for bonds
rated in the highest short-term rating category by Moody's Investors Service,
Inc. and Standard &
 
                                      S-15

Poor's Corporation in respect of issuers selected by such successor indexing
agent most closely resembling the "high grade" component issuers selected by
Kenny Information Systems that are subject to tender by the holders thereof for
purchase on not more than seven days' notice and the interest on which is (A)
variable on a weekly basis, (B) excludable from gross income for federal income
tax purposes under the Code, and (C) not subject to an "alternate minimum tax"
or similar tax under the Code, unless all tax-exempt bonds are subject to such
tax; PROVIDED, HOWEVER, that if a successor indexing agent is not available, the
J.J. Kenny Rate with respect to such J.J. Kenny Rate Determination Date will be
the J.J. Kenny Rate for the immediately preceding Interest Reset Period (or, if
there was no such Interest Reset Period, the Initial Interest Rate).
 
    The "Calculation Date" pertaining to any J.J. Kenny Rate Determination Date
shall be the tenth calendar day after such J.J. Kenny Rate Determination Date
or, if such day is not a Business Day, the next succeeding Business Day.
 
ELEVENTH DISTRICT COST OF FUNDS RATE NOTES
 
    Eleventh District Cost of Funds Rate Notes will bear interest at the
interest rates (calculated by reference to the Eleventh District Cost of Funds
Rate and the Spread and/or Spread Multiplier, if any) specified in the Eleventh
District Cost of Funds Rate Notes and in the applicable Pricing Supplement.
 
    Unless otherwise indicated in an applicable Pricing Supplement, the
"Eleventh District Cost of Funds Rate" for each Interest Reset Period will be
determined by the Calculation Agent for such Eleventh District Cost of Funds
Rate Note as of the last working day of the month immediately prior to such
Interest Reset Date for such Interest Reset Period on which the Federal Home
Loan Bank of San Francisco (the "FHLB of San Francisco") publishes the Eleventh
District Cost of Funds Index (as defined below) (the "Eleventh District Cost of
Funds Rate Determination Date"), and shall be the rate equal to the monthly
weighted average cost of funds for the calendar month preceding such Eleventh
District Cost of Funds Rate Determination Date as set forth under the caption
"Eleventh District" on the Telerate Page 7058 (which page shall be deemed to
include any successor page (as determined by the Calculation Agent)) as of 11:00
A.M., San Francisco time, on such Eleventh District Cost of Funds Interest
Determination Date. If such rate does not appear on Telerate Page 7058 on any
related Eleventh District Cost of Funds Rate Determination Date, the Eleventh
District Cost of Funds Rate for such Eleventh District Cost of Funds Rate
Determination Date shall be the monthly weighted average cost of funds paid by
member institutions of the Eleventh Federal Home Loan Bank District that was
most recently announced (the "Eleventh District Cost of Funds Rate Index") by
the FHLB of San Francisco as such cost of funds for the calendar month preceding
the date of such announcement. If the FHLB of San Francisco fails to announce
such rate for the calendar month next preceding such Eleventh District Cost of
Funds Rate Determination Date, then the Eleventh District Cost of Funds Rate for
such Eleventh District Cost of Funds Rate Determination Date will be the
Eleventh District Cost of Funds Rate in effect on such Eleventh District Cost of
Funds Rate Determination Date.
 
INVERSE FLOATING RATE NOTES
 
    Any Floating Rate Note may be designated in the applicable Pricing
Supplement as an "Inverse Floating Rate Note," in which event, unless otherwise
specified in the applicable Pricing Supplement, the interest rate on such
Floating Rate Note will be equal to (i) in the case of the period, if any,
commencing on the Issue Date (or the date on which such Note otherwise begins to
accrue interest (if different from the Issue Date)) up to the first Interest
Reset Date, a fixed rate of interest established by the Company as described in
the applicable Pricing Supplement and (ii) in the case of each period commencing
on an Interest Reset Date, a fixed rate of interest specified in the Pricing
Supplement minus the interest rate determined by reference to the Base Rate as
adjusted by the Spread and/or Spread Multiplier, if any; PROVIDED, HOWEVER, that
(x) the interest rate thereon will not be less than zero
 
                                      S-16

and (y) the interest rate in effect for the ten days immediately prior to the
date of Maturity of such Inverse Floating Rate Note will be that in effect on
the tenth day preceding such date.
 
FLOATING RATE/FIXED RATE NOTES
 
    The applicable Pricing Supplement may provide that a Note will be a Floating
Rate Note for a specified portion of its term and a Fixed Rate Note for the
remainder of its term, in which event the interest rate on such Note will be
determined as herein provided as if it were a Floating Rate Note and a Fixed
Rate Note hereunder for each such respective period, all as specified in such
applicable Pricing Supplement.
 
SUBSEQUENT INTEREST PERIODS
 
    The Pricing Supplement relating to each Note will indicate whether the
Company has the option to reset the interest rate (in the case of a Fixed Rate
Note) with respect to such Note or the Spread, Spread Multiplier, or method of
calculation (in the case of a Floating Rate Note) with respect to such Note and,
if so, the date or dates on which such interest rate or such Spread, Spread
Multiplier, or method of calculation, as the case may be, may be reset (each an
"Optional Reset Date").
 
    The Company shall notify the Trustee for a Note whether or not it intends to
exercise such option with respect to such Note at least 45 but not more than 60
days prior to an Optional Reset Date for such Note. Not later than 40 days prior
to such Optional Reset Date, the Trustee for such Note will mail to the Holder
of such Note a notice (the "Reset Notice"), first class, postage prepaid,
indicating whether the Company has elected to reset the interest rate (in the
case of a Fixed Rate Note) or the Spread, Spread Multiplier or method of
calculation (in the case of a Floating Rate Note) and, if so, (i) such new
interest rate or such new Spread, Spread Multiplier, or method of calculation,
as the case may be; and (ii) the provisions, if any, for redemption during the
period from such Optional Reset Date to the next Optional Reset Date or, if
there is no such next Optional Reset Date, to the Stated Maturity of such Note
(each such period a "Subsequent Interest Period"), including the date or dates
on which or the period or periods during which and the price or prices at which
such redemption may occur during such Subsequent Interest Period. Upon the
transmittal by the Trustee of a Reset Notice to the Holder of a Note, such new
interest rate or such new Spread, Spread Multiplier, and/or method of
calculation as the case may be, shall take effect automatically, and, except as
modified by the Reset Notice and as described below, such Note will have the
same terms as prior to the transmittal of such Reset Notice.
 
    Notwithstanding the foregoing, not later than 20 days prior to an Optional
Reset Date for a Note, the Company may, at its option, revoke the interest rate
(in the case of a Fixed Rate Note) or the Spread or Spread Multiplier (in the
case of a Floating Rate Note) provided for in the Reset Notice with respect to
such Optional Reset Date and establish a higher interest rate (in the case of a
Fixed Rate Note) or a higher Spread or Spread Multiplier (in the case of a
Floating Rate Note) for the Subsequent Interest Period commencing on such
Optional Reset Date by causing the Trustee for such Note to mail notice of such
higher interest rate or higher Spread or Spread Multiplier, as the case may be,
first class, postage prepaid, to the Holder of such Note. Such notice shall be
irrevocable. All Notes with respect to which the interest rate or Spread or
Spread Multiplier is reset on an Optional Reset Date will bear such higher
interest rate (in the case of Fixed Rate Notes) or higher Spread or Spread
Multiplier (in the case of Floating Rate Notes), whether or not tendered for
repayment.
 
    The Holder of a Note will have the option to elect repayment of such Note by
the Company on each Optional Reset Date at a price equal to the principal amount
thereof, plus interest accrued to such Optional Reset Date. In order for a Note
to be repaid on an Optional Reset Date, the Holder thereof must follow the
procedures set forth below under "Optional Redemption, Repayment and Repurchase"
for optional repayment, except that the period for delivery of such Note or
notification to
 
                                      S-17

the Trustee for such Note shall be at least 25 but not more than 35 days prior
to such Optional Reset Date, and except that a Holder who has tendered a Note
for repayment pursuant to a Reset Notice may, by written notice to the Trustee
for such Note, revoke any such tender for repayment until the close of business
on the tenth day prior to such Optional Reset Date.
 
AMORTIZING NOTES
 
    The Company may from time to time offer Notes ("Amortizing Notes") on which
a portion or all the principal amount is payable prior to Stated Maturity in
accordance with a schedule, by application of a formula, or by reference to an
Index (as defined below). Further information concerning additional terms and
conditions of any Amortizing Notes, including terms for repayment thereof, will
be set forth in the applicable Pricing Supplement.
 
INDEXED NOTES
 
    The Company may from time to time offer Indexed Notes on which certain or
all interest payments (in the case of an "Indexed Rate Note"), and/or the
principal amount payable at Stated Maturity or earlier redemption or retirement
(in the case of an "Indexed Principal Note"), is determined by reference to the
principal amount of such Notes (or, in the case of an Indexed Principal Note, to
the amount designated in the applicable Pricing Supplement as the "Face Amount"
of such Indexed Note) and by reference to prices, changes in prices, or
differences between prices, of securities, currencies, intangibles, goods,
articles or commodities or by application of a formula or by such other
objective price, economic or other measures as are described in the applicable
Pricing Supplement (any such measure or measures, an "Index"). A description of
the Index used in any determination of an interest or principal payment, and the
method or formula by which interest or principal payments will be determined by
reference to such Index, will be set forth in the applicable Pricing Supplement.
 
    In the case of a Fixed Rate Note, Floating Rate Note or Indexed Rate Note
that is also an Indexed Principal Note, the amount of any interest payment will
be determined by reference to the Face Amount of such Indexed Note unless
specified otherwise in the applicable Pricing Supplement. In the case of an
Indexed Principal Note, the principal amount payable at Stated Maturity or any
earlier redemption or repayment of the Indexed Note may be different from the
Face Amount.
 
    If the determination of the Index on which any interest payment or the
principal amount of an Indexed Note is calculated or announced by a third party,
which may be the Agent or another affiliate of the Company, and such third party
either suspends the calculation or announcement of such Index or changes the
basis upon which such Index is calculated (other than changes consistent with
policies in effect at the time such Indexed Note was issued and permitted
changes described in the applicable Pricing Supplement), then such Index shall
be calculated for purposes of such Indexed Note by another third party selected
by the Company, which may be the Agent or another affiliate of the Company,
subject to the same conditions and controls as applied to the original third
party. If for any reason such Index cannot be calculated on the same basis and
subject to the same conditions and controls as applied to the original third
party, then the indexed interest payments, if any, or any indexed principal
amount of such Indexed Note shall be calculated in the manner set forth in the
applicable Pricing Supplement. Any determination of such third party shall, in
the absence of manifest error, be binding on all parties.
 
    Unless otherwise specified in the applicable Pricing Supplement, (i) for the
purpose of determining whether Holders of the requisite principal amount of
Notes outstanding under the applicable Indenture have made a demand or given a
notice or waiver or taken any other action, the outstanding principal amount of
Indexed Notes will be deemed to be the Face Amount thereof, and (ii) in the
event of an acceleration of the Stated Maturity of an Indexed Note, the
principal amount payable to the Holder of such Note upon acceleration will be
the principal amount determined by reference to the formula by
 
                                      S-18

which the principal amount of such Note would be determined on the Stated
Maturity thereof, as if the date of acceleration were the Stated Maturity.
 
    An investment in Indexed Notes entails significant risks, including wide
fluctuations in market value as well as in the amounts of payments due
thereunder, that are not associated with a similar investment in a conventional
debt security. Such risks depend on a number of factors including supply and
demand for the particular security, currency, commodity or other good or article
to which the Note is indexed and economic and political events over which the
Company has no control. Fluctuations in the price of any particular security or
commodity, in the rates of exchange between particular currencies or in
particular indices that have occurred in the past are not necessarily
indicative, however, of fluctuations in the price or rates of exchange that may
occur during the term of any Indexed Notes. Accordingly, prospective investors
should consult their own financial and legal advisors as to the risks entailed
by investment in Indexed Notes.
 
DUAL CURRENCY NOTES
 
    The Company may from time to time offer Notes (the "Dual Currency Notes") as
to which the Company has a one time option, exercisable on any one of the dates
specified in the applicable Pricing Supplement (each an "Option Election Date")
in whole, but not in part, with respect to all Dual Currency Notes issued on the
same day and having the same terms (a "Tranche"), of thereafter making all
payments of principal, premium, if any, and interest (which payments would
otherwise be made in the Specified Currency of such Notes) in the optional
currency specified in the applicable Pricing Supplement (the "Optional Payment
Currency"). Information as to the relative value of the Specified Currency
compared to the Optional Payment Currency will be set forth in the applicable
Pricing Supplement.
 
    The Pricing Supplement for each issuance of Dual Currency Notes will
specify, among other things, the Specified Currency and Optional Payment
Currency of such issuance and the Designated Exchange Rate for such issuance,
which will be a fixed exchange rate used for converting amounts denominated in
the Specified Currency into amounts denominated in the Optional Payment Currency
(the "Designated Exchange Rate"). The Pricing Supplement will also specify the
Option Election Dates and Interest Payment Dates for the related issuance of
Dual Currency Notes. Each Option Election Date will be a certain number of days
before an Interest Payment Date or Stated Maturity, as set forth in the
applicable Pricing Supplement, and will be the date on which the Company may
select whether to make all scheduled payments due thereafter in the Optional
Payment Currency rather than in the Specified Currency.
 
    If the Company makes such an election, the amount payable in the Optional
Payment Currency shall be determined using the Designated Exchange Rate
specified in the applicable Pricing Supplement. If such election is made, notice
of such election shall be mailed in accordance with the terms of the applicable
Tranche of Dual Currency Notes within two Business Days of the Option Election
Date and shall state (i) the first date, whether an Interest Payment Date and/or
Stated Maturity, in which scheduled payments in the Optional Payment Currency
will be made and (ii) the Designated Exchange Rate. Any such notice by the
Company, once given, may not be withdrawn. The equivalent value in the Specified
Currency of payments made after such an election may be less, at the then
current exchange rate, than if the Company had made such payment in the
Specified Currency.
 
    For United States federal income tax purposes, holders of Dual Currency
Notes may be subject to rules which differ from the general rules applicable to
holders of other types of Notes offered hereby. The United States federal income
tax consequences of the purchase, ownership and disposition of Dual Currency
Notes will be set forth in the applicable Pricing Supplement.
 
                                      S-19

RENEWABLE NOTES
 
    The Company may from time to time offer Notes which will mature on an
Interest Payment Date specified in the applicable Pricing Supplement occurring
in or prior to the twelfth month following the Original Issue Date of such Notes
(the "Initial Maturity Date") unless the term of all or any portion of any such
Note (a "Renewable Note") is renewed in accordance with the procedures described
below.
 
    On the Interest Payment Date occurring in the sixth month (unless a
different interval (the "Special Election Interval") is specified in the
applicable Pricing Supplement) prior to the Initial Maturity Date of a Renewable
Note (the "Initial Renewal Date") and on the Interest Payment Date occurring in
each sixth month (or in the last month of each Special Election Interval) after
such Initial Renewal Date (each, together with the Initial Renewal Date, a
"Renewal Date"), the term of such Renewable Note may be extended to the Interest
Payment Date occurring in the twelfth month (or, if a Special Election Interval
is specified in the applicable Pricing Supplement, the last month in a period
equal to twice the Special Election Interval) after such Renewal Date, if the
holder of such Renewable Note elects to extend the term of such Renewable Note
or any portion thereof as described below. If a Holder does not elect to extend
the term of any portion of the principal amount of a Renewable Note during the
specified period prior to any Renewal Date, such portion will become due and
payable on the Interest Payment Date occurring in the sixth month (or the last
month in the Special Election Interval) after such Renewal Date (the "New
Maturity Date").
 
    A Holder of a Renewable Note may elect to renew the term of such Renewable
Note, or if so specified in the applicable Pricing Supplement, any portion
thereof, by delivering a notice to such effect to the Trustee (or any duly
appointed paying agent) at the corporate trust office of the Trustee or agency
of the Trustee in the City of New York not less than 15 nor more than 30 days
prior to such Renewal Date (unless another period is specified in the applicable
Pricing Supplement as the "Special Election Period"). Such election will be
irrevocable and will be binding upon each subsequent Holder of such Renewable
Note. An election to renew the term of a Renewable Note may be exercised with
respect to less than the entire principal amount of such Renewable Note only if
so specified in the applicable Pricing Supplement and only in such principal
amount, or any integral multiple in excess thereof, as is specified in the
applicable Pricing Supplement. Notwithstanding the foregoing, the term of the
Renewable Notes may not be extended beyond the Stated Maturity specified for
such Renewable Notes in the applicable Pricing Supplement.
 
    If the Holder does not elect to renew the term, such Renewable Note must be
presented to the Trustee (or any duly appointed paying agent) and, with respect
to a Renewable Note that is a certificate issued in definitive form, as soon as
practicable following receipt of such Renewable Note the Trustee (or any duly
appointed paying agent) shall issue in exchange therefor in the name of such
Holder (i) a Note, in a principal amount equal to the principal amount of such
exchanged Renewable Note for which no election to renew the term thereof was
exercised, with terms identical to those specified on such Renewable Note
(except that such Note shall have a fixed, nonrenewable Stated Maturity on the
New Maturity Date) and (ii) if an election to renew is made with respect to less
than the full principal amount of such holder's Renewable Note, a replacement
Renewable Note, in a principal amount equal to the principal amount of such
exchanged Renewable Note for which the election to renew was made, with terms
identical to such exchanged Renewable Notes.
 
EXTENSION OF MATURITY
 
    The Pricing Supplement relating to each Note will indicate whether the
Company has the option to extend the Stated Maturity of such Note for one or
more periods of whole years from one to five (each an "Extension Period") up to
but not beyond the date (the "Final Maturity") set forth in such Pricing
Supplement.
 
                                      S-20

    The Company may exercise such option with respect to a Note by notifying the
Trustee for such Note at least 45 but not more than 60 days prior to the old
Stated Maturity of such Note. Not later than 40 days prior to the old Stated
Maturity of such Note, the Trustee for such Note will mail to the Holder of such
Note a notice (the "Extension Notice"), first class, postage prepaid. The
Extension Notice will set forth (i) the election of the Company to extend the
Stated Maturity of such Note; (ii) the new Stated Maturity; (iii) in the case of
a Fixed Rate Note, the interest rate applicable to the Extension Period or, in
the case of a Floating Rate Note, the Spread, Spread Multiplier or method of
calculation applicable to the Extension Period; and (iv) the provisions, if any,
for redemption during the Extension Period, including the date or dates on which
or the period or periods during which and the price or prices at which such
redemption may occur during the Extension Period. Upon the mailing by such
Trustee of an Extension Notice to the Holder of a Note, the Stated Maturity of
such Note shall be extended automatically, and, except as modified by the
Extension Notice and as described in the next paragraph, such Note will have the
same terms as prior to the mailing of such Extension Notice. Notwithstanding the
foregoing, not later than 20 days prior to the old Stated Maturity of such Note,
the Company may, at its option, revoke the interest rate (in the case of a Fixed
Rate Note) or the Spread or Spread Multiplier (in the case of a Floating Rate
Note) provided for in the Extension Notice for such Note and establish a higher
interest rate (in the case of a Fixed Rate Note) or a higher Spread or Spread
Multiplier (in the case of a Floating Rate Note) for the Extension Period, by
causing the Trustee for such Note to mail notice of such higher interest rate or
higher Spread or Spread Multiplier, as the case may be, first class, postage
prepaid, to the Holder of such Note. Such notice shall be irrevocable. All Notes
with respect to which the Stated Maturity is extended will bear such higher
interest rate (in the case of Fixed Rate Notes) or higher Spread or Spread
Multiplier (in the case of Floating Rate Notes) for the Extension Period,
whether or not tendered for repayment.
 
    If the Company extends the Stated Maturity of a Note, the Holder of such
Note will have the option to elect repayment of such Note by the Company on the
old Stated Maturity at a price equal to the principal amount thereof, plus
interest accrued to such date. In order for a Note to be repaid on the old
Stated Maturity once the Company has extended the Stated Maturity thereof, the
Holder thereof must follow the procedures set forth below under "Optional
Redemption, Repayment and Repurchase" for optional repayment, except that the
period for delivery of such Note or notification to the Trustee for such Note
shall be at least 25 but not more than 35 days prior to the old Stated Maturity
and except that a Holder who has tendered a Note for repayment pursuant to an
Extension Notice may, by written notice to the Trustee for such Note, revoke any
such tender for repayment until the close of business on the tenth day before
the old Stated Maturity.
 
COMBINATION OF PROVISIONS
 
    If so specified in the applicable Pricing Supplement, any Note may be
subject to all of the provisions, or any combination of the provisions,
described above under "Subsequent Interest Periods," "Extension of Maturity" and
"Renewable Notes."
 
BOOK-ENTRY SYSTEM
 
    Upon issuance, and subject to the rules of the Depositary, all Book-Entry
Notes having the same Original Issue Date and otherwise identical terms will be
represented by a single Global Security. Each Global Security representing
Book-Entry Notes will be deposited with, or on behalf of the Depositary, and
registered in the name of a nominee of the Depositary. Book-Entry Notes will not
be exchangeable for Certificated Notes and, except under the circumstances
described in the Prospectus under "Description of Debt Securities--Global
Securities," will not otherwise be issuable as Certificated Notes.
 
    The Depositary has advised the Company and the Agent as follows: The
Depositary is a limited-purpose trust company organized under New York Banking
Law, a "banking organization" within the meaning of New York Banking Law, a
member of the Federal Reserve System, a "clearing corporation"
 
                                      S-21

within the meaning of the New York Uniform Commercial Code, and a "clearing
agency" registered pursuant to the provisions of Section 17A of the Securities
Exchange Act of 1934, as amended. The Depositary was created to hold securities
of its participants and to facilitate the clearance and settlement of securities
transactions among its participants in such securities through electronic
book-entry changes in accounts of the participants, thereby eliminating the need
for physical movement of securities certificates. The Depositary's participants
include securities brokers and dealers (including the Agent), banks, trust
companies, clearing corporations, and certain other organizations, some of whom
(and/or their representatives) own the Depositary. Access to the Depositary's
book-entry system is also available to others, such as banks, brokers, dealers
and trust companies that clear through or maintain a custodial relationship with
a participant, either directly or indirectly.
 
    If an issue of Notes is denominated in a currency other than the U.S.
dollar, the Company will make payments of principal and any interest in the
currency in which the Notes are denominated (the "foreign currency") or in U.S.
dollars. DTC has elected to have all such payments of principal and interest in
U.S. dollars unless notified by any of its participants through which an
interest in the Notes is held that it elects, in accordance with and to the
extent permitted by the applicable Pricing Supplement and the revelant Note, to
receive such payment of principal or interest in the foreign currency. On or
prior to the third Business Day after the record date for payment of interest
and twelve days prior to the date for payment of principal, such participant
shall notify DTC of (i) its election to receive all, or the specified portion,
of such payment in the foreign currency and (ii) its instructions for wire
transfer of such payment to a foreign currency account.
 
    A further description of the Depositary's procedures with respect to Global
Securities representing Book-Entry Notes is set forth in the Prospectus under
"Description of Debt Securities--Global Securities." The Depositary has
confirmed to the Company, the Agent and the Trustees that it intends to follow
such procedures.
 
OPTIONAL REDEMPTION, REPAYMENT AND REPURCHASE
 
    The Pricing Supplement relating to each Note will indicate either that such
Note cannot be redeemed prior to its Stated Maturity or that such Note will be
redeemable at the option of the Company, in whole or in part, and the date or
dates (each an "Optional Redemption Date") on which such Note may be redeemed
and the price (the "Redemption Price") at which (together with accrued interest
to such Optional Redemption Date) such Note may be redeemed on each such
Optional Redemption Date. Unless otherwise specified in the applicable Pricing
Supplement, at least 30 days prior to the date of redemption, such Trustee shall
mail notice of such redemption, first class, postage prepaid, to the Holder of
such Note. Unless otherwise specified in the applicable Pricing Supplement, the
Company may exercise such option with respect to a redemption of a Note in part
only by notifying the Trustee for such Note at least 45 days prior to any
Optional Redemption Date. In the event of redemption of a Note in part only, a
new Note or Notes for the unredeemed portion thereof shall be issued to the
Holder thereof upon the cancellation thereof. The Notes (other than Amortizing
Notes) will not be subject to any sinking fund.
 
    The Pricing Supplement relating to each Note will also indicate whether the
Holder of such Note will have the option to elect repayment of such Note by the
Company prior to its Stated Maturity, and, if so, such Pricing Supplement will
specify the date or dates on which such Note may be repaid (each an "Optional
Repayment Date") and the price (the "Optional Repayment Price") at which,
together with accrued interest to such Optional Repayment Date, such Note may be
repaid on each such Optional Repayment Date.
 
    In order for a Note to be repaid, the Trustee for such Note must receive, at
least 30 but not more than 45 days prior to an Optional Repayment Date (i) such
Note with the form entitled "Option to
 
                                      S-22

Elect Repayment" on the reverse thereof duly completed, or (ii) a telegram,
telex, facsimile transmission or letter from a member of a national securities
exchange or the National Association of Securities Dealers, Inc. (the "NASD") or
a commercial bank or trust company in the United States setting forth the name
of the Holder of such Note, the principal amount of such Note to be repaid, the
certificate number or a description of the tenor and terms of such Note, a
statement that the option to elect repayment is being exercised thereby and a
guarantee that the Note to be repaid with the form entitled "Option to Elect
Repayment" on the reverse of the Note duly completed will be received by such
Trustee not later than five Business Days after the date of such telegram,
telex, facsimile transmission or letter. If the procedure described in clause
(ii) of the preceding sentence is followed, then such Note and form duly
completed must be received by such Trustee by such fifth Business Day. Any
tender of a Note by the Holder for repayment (except pursuant to a Reset Notice
or an Extension Notice) shall be irrevocable. The repayment option may be
exercised by the Holder of a Note for less than the entire principal amount of
such Note provided that the principal amount of such Note remaining outstanding
after repayment is an authorized denomination. Upon such partial repayment, such
Note shall be canceled and a new Note or Notes for the remaining principal
amount thereof shall be issued in the name of the Holder of such repaid Note.
 
    If a Note is represented by a Global Security, the Depositary's nominee will
be the Holder of such Note and therefore will be the only entity that can
exercise a right to repayment. In order to ensure that the Depositary's nominee
will timely exercise a right to repayment with respect to a particular Note, the
beneficial owner of such Note must instruct the broker or other direct or
indirect participant through which it holds an interest in such Note to notify
the Depositary of its desire to exercise a right to repayment. Different firms
have different cut-off times for accepting instructions from their customers
and, accordingly, each beneficial owner should consult the broker or other
direct or indirect participant through which it holds an interest in a Note in
order to ascertain the cut-off time by which such an instruction must be given
in order for timely notice to be delivered to the Depositary.
 
    Notwithstanding anything in this Prospectus Supplement to the contrary, if a
Note is an OID Note (other than an Indexed Note), the amount payable on such
Note in the event of redemption or repayment prior to its Stated Maturity (other
than pursuant to an optional redemption by the Company at a stated Redemption
Price) shall be the Amortized Face Amount of such Note as of the date of
redemption or the date of repayment, as the case may be. The Amortized Face
Amount of a Note on any date shall be the amount equal to (i) the Issue Price
set forth on the face of the applicable Pricing Supplement plus (ii) that
portion of the difference between such Issue Price and the stated principal
amount of such Note that has accrued by such date at (x) the Bond Yield to
Maturity set forth on the face of the applicable Pricing Supplement or (y) if so
specified in the applicable Pricing Supplement, the Bond Yield to Call set forth
on the face thereof (computed in each case in accordance with generally accepted
United States bond yield computation principles), PROVIDED, HOWEVER, that in no
event shall the Amortized Face Amount of a Note exceed its stated principal
amount. The Bond Yield to Call listed on the face of a Pricing Supplement shall
be computed on the basis of the first occurring Optional Redemption Date with
respect to such Note and the amount payable on such Optional Redemption Date. In
the event that any such Note is not redeemed on such first occurring Optional
Redemption Date, the Bond Yield to Call with respect to such Note shall be
recomputed on such Optional Redemption Date on the basis of the next occurring
Optional Redemption Date and the amount payable on such Optional Redemption
Date, and shall continue to be so recomputed on each succeeding Optional
Redemption Date until the Note is so redeemed.
 
    The Company may at any time purchase Notes at any price in the open market
or otherwise. Notes so purchased by the Company may, at the discretion of the
Company, be held or resold or surrendered to the Trustee for such Notes for
cancellation.
 
                                      S-23

OTHER PROVISIONS
 
    Any provisions with respect to the determination of an interest rate basis,
the specification of an interest rate basis, calculation of the interest rate
applicable to, or the principal payable at Maturity on, any Note, its Interest
Payment Dates or any other matter relating thereto may be modified by the terms
as specified in the applicable Pricing Supplement.
 
DEFEASANCE
 
    The defeasance provisions described in the Prospectus will not be applicable
to the Notes.
 
                                      S-24

                                 CURRENCY RISKS
 
EXCHANGE RATES AND EXCHANGE CONTROLS
 
    An investment in Notes that are denominated in a Specified Currency other
than U.S. dollars ("Foreign Currency Notes") entails significant risks that are
not associated with a similar investment in a security denominated in U.S.
dollars. Similarly, an investment in an Indexed Note on which all or a part of
any payment due is determined by reference to a currency other than U.S. dollars
entails significant risks that are not associated with a similar investment in
non-Indexed Notes. Such risks include, without limitation, the possibility of
significant market changes in rates of exchange between U.S. dollars and such
Specified Currency, the possibility of significant changes in rates of exchange
between U.S. dollars and such Specified Currency resulting from official
redenomination with respect to such Specified Currency and the possibility of
the imposition or modification of foreign exchange controls by either the United
States or foreign governments. Such risks generally depend on factors over which
the Company has no control and which cannot be readily foreseen, such as
economic and political events, and on the supply of and demand for the relevant
currencies. In recent years, rates of exchange between the U.S. dollar and
certain foreign currencies, and between certain foreign currencies and other
foreign currencies, have been volatile, and such volatility may be expected in
the future. Fluctuations that have occurred in any particular exchange rate in
the past are not necessarily indicative, however, of fluctuations that may occur
in the rate during the term of any Foreign Currency Note. Depreciation of the
Specified Currency of a Foreign Currency Note against U.S. dollars would result
in a decrease in the effective yield of such Foreign Currency Note below its
coupon rate and, in certain circumstances, could result in a substantial loss to
the investor on a U.S. dollar basis.
 
    Governments have imposed from time to time, and may in the future impose,
exchange controls that could affect exchange rates as well as the availability
of a Specified Currency (other than U.S. dollars) at the time of payment of
principal of, or premium, if any, or interest on, a Foreign Currency Note. There
can be no assurance that exchange controls will not restrict or prohibit
payments of principal (and premium, if any) or interest in any such Specified
Currency. Even if there are no actual exchange controls, it is possible that
such Specified Currency would not be available to the Company when payments on
such Note are due because of circumstances beyond the control of the Company. In
any such event, the Company will make required payments in U.S. dollars on the
basis described herein. See "--Payment Currency" below and "Description of
Notes--Payment of Principal and Interest." Prospective purchasers should consult
their own financial and legal advisors as to the risks entailed by an investment
in Notes denominated in a currency other than U.S. dollars.
 
    The information set forth in this Prospectus Supplement is directed to
prospective purchasers of Notes who are United States residents, and the Company
disclaims any responsibility to advise prospective purchasers who are residents
of countries other than the United States with respect to any matters that may
affect the purchase or holding of, or receipt of payments of principal, premium
or interest in respect of, Notes. Such persons should consult their advisors
with regard to such matters. Any Pricing Supplement relating to Notes having a
Specified Currency other than U.S. dollars will contain a description of any
material exchange controls affecting such currency and any other required
information concerning such currency.
 
PAYMENT CURRENCY
 
    Except as set forth below, if payment in respect of a Note is required to be
made in a Specified Currency other than U.S. dollars and such currency is
unavailable due to the imposition of exchange controls or other circumstances
beyond the Company's control or is no longer used by the government of the
country issuing such currency or for the settlement of transactions by public
institutions of or within the international banking community, then all payments
in respect of such Note shall be made in U.S. dollars until such currency is
again available or so used. The amounts so payable on any date in
 
                                      S-25

such currency shall be converted into U.S. dollars on the basis of the most
recently available Market Exchange Rate for such currency or as otherwise
indicated in the applicable Pricing Supplement. Any payment in respect of such
Note made under such circumstances in U.S. dollars will not constitute an Event
of Default under the Indenture under which such Note shall have been issued.
 
    In the event of an official redenomination of the Specified Currency of a
Note (other than as a result of European Monetary Union, but including, without
limitation, an official redenomination of any such Specified Currency that is a
composite currency), the obligations of the Company with respect to payments on
Notes denominated in such Specified Currency shall, in all cases, be deemed
immediately following such redenomination to provide for the payment of that
amount of redenominated currency representing the amount of such obligations
immediately before such redenomination. Notes will not provide for any
adjustment to any amount payable under such Notes as a result of (i) any change
in the value of the Specified Currency thereof relative to any other currency
due solely to fluctuations in exchange rates or (ii) any redenomination of any
component currency of any composite currency (unless such composite currency is
itself officially redenominated). The procedures described in this section shall
not apply in the event of European Monetary Union. For a description of the
procedure to be followed in connection with European Monetary Union, see
"European Monetary Union" in the Prospectus.
 
    Currently, there are limited facilities in the United States for conversion
of U.S. dollars into foreign currencies, and vice versa. In addition, banks do
not generally offer non-U.S. dollar-denominated checking or savings account
facilities in the United States. Accordingly, payments on Notes made in a
currency other than U.S. dollars will be made from an account at a bank located
outside the United States unless otherwise specified in the applicable Pricing
Supplement.
 
FOREIGN CURRENCY JUDGMENTS
 
    The Notes will be governed by and construed in accordance with the law of
the State of New York. Courts in the United States customarily have not rendered
judgments for money damages denominated in any currency other than the U.S.
dollar. A 1987 amendment to the Judiciary Law of the State of New York provides,
however, that an action based upon an obligation denominated in a currency other
than U.S. dollars will be rendered in the foreign currency of the underlying
obligation and converted into U.S. dollars at the rate of exchange prevailing on
the date of the entry of the judgment or decree.
 
                             RISKS OF INDEXED NOTES
 
    An investment in Indexed Notes may entail significant risks that are not
associated with a similar investment in a debt instrument that has a fixed
principal amount, is denominated in U.S. dollars and bears interest at either a
fixed rate or a floating rate determined by reference to nationally published
interest rate references. The risks of a particular Indexed Note will depend on
the terms of such Indexed Note, but may include, without limitation, the
possibility of significant changes in the prices of securities, currencies,
intangibles, goods, articles or commodities or of other objective price,
economic or other measures making up the relevant Index (the "Underlying
Assets"). Such risks generally depend on factors over which the Company has no
control and which cannot readily be foreseen, such as economic and political
events and the supply of and demand for the Underlying Assets. In recent years,
currency exchange rates and prices for various Underlying Assets have been
highly volatile, and such volatility may be expected in the future. Fluctuations
in any such rates or prices that have occurred in the past are not necessarily
indicative, however, of fluctuations that may occur during the term of any
Indexed Note.
 
    In considering whether to purchase Indexed Notes, investors should be aware
that the calculation of amounts payable in respect of Indexed Notes may involve
reference to an Index determined by an
 
                                      S-26

affiliate of the Company or to prices which are published solely by third
parties or entities which are not subject to regulation under the laws of the
United States. The risk of loss as a result of the linkage of principal or
interest payments on Indexed Notes to an Index and to the Underlying Assets can
be substantial. Prospective purchasers should consult their own financial and
legal advisors as to the risks entailed by an investment in Indexed Notes.
 
            CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS
 
    The following is a summary of certain United States federal income tax
considerations that may be relevant to a holder of a Note. The summary is based
on laws, regulations, rulings and decisions now in effect, all of which are
subject to change, possibly with retroactive effect. This summary deals only
with holders that will hold Notes as capital assets, and does not address tax
considerations applicable to investors that may be subject to special tax rules,
including, without limitation, banks, tax-exempt entities, insurance companies,
regulated investment companies, common trust funds or dealers in securities or
currencies, persons that will hold Notes as a part of an integrated investment
(including a "straddle" or "conversion transaction") comprised of a Note and one
or more other positions or persons that have a "functional currency" other than
the U.S. dollar. Any special United States federal income tax considerations
relevant to a particular issue of Notes, including any Indexed Notes, Dual
Currency Notes or Notes providing for contingent payments, will be provided in
the applicable Pricing Supplement. Purchasers of such Notes should carefully
examine the applicable Pricing Supplement and should consult with their tax
advisors with respect to such Notes.
 
    Investors should consult their tax advisors in determining the tax
consequences to them of holding Notes, including the application to their
particular situation of the United States federal income tax considerations
discussed below, as well as the application of state, local, foreign or other
tax laws.
 
    As used herein, the term "United States holder" means a person who is a
citizen or resident of the United States, or that is a corporation, partnership
or other entity created or organized in or under the laws of the United States
or any political subdivision thereof, an estate the income of which is subject
to United States federal income taxation regardless of its source or a trust if
(i) a U.S. court is able to exercise primary supervision over the trust's
administration and (ii) one or more United States persons have the authority to
control all of the trust's substantial decisions, and the term "United States"
means the United States of America (including the States and the District of
Columbia).
 
UNITED STATES HOLDERS
 
PAYMENTS OF INTEREST
 
    Payments of "qualified stated interest" (as defined below under "Original
Issue Discount") on a Note will be taxable to a United States holder as ordinary
interest income at the time that such payments are accrued or are received (in
accordance with the United States holder's method of tax accounting). If such
payments of interest are made with respect to a Note that is denominated in a
Specified Currency other than the U.S. dollar (a "Foreign Currency Note"), the
amount of interest income realized by a United States holder that uses the cash
method of tax accounting will be the U.S. dollar value of the Specified Currency
payment based on the spot rate of exchange on the date of receipt regardless of
whether the payment in fact is converted into U.S. dollars. A United States
holder that uses the accrual method of tax accounting will accrue interest
income on the Foreign Currency Note in the relevant foreign currency and
translate the amount accrued into U.S. dollars based on the average exchange
rate in effect during the interest accrual period (or portion thereof within
such holder's taxable year), or, at such holder's election, at the spot rate of
exchange on (i) the last day of the accrual period (or the last day of the
taxable year within such accrual period if the accrual period spans more than
one taxable year), or (ii) the date of receipt, if such date is within five
business days of the last day of the accrual period. Such election must be
applied consistently by the United States
 
                                      S-27

holder to all debt instruments from year to year and can be changed only with
the consent of the Internal Revenue Service (the "IRS"). A United States holder
that uses the accrual method of tax accounting will recognize foreign currency
gain or loss, which will be treated as ordinary income or loss, on the receipt
of an interest payment made with respect to a Foreign Currency Note if the spot
rate of exchange on the date the payment is received differs from the rate
applicable to a previous accrual of that interest income.
 
PURCHASE, SALE AND RETIREMENT OF NOTES
 
    A United States holder's tax basis in a Note generally will equal the cost
of such Note to such holder, increased by any amounts includible in income by
the holder as original issue discount ("OID") and market discount and reduced by
any amortized premium (each as described below) and any payments other than
payments of qualified stated interest (as described below) made on such Note. In
the case of a Foreign Currency Note, the cost of such Note to a United States
holder will be the U.S. dollar value of the foreign currency purchase price on
the date of purchase. In the case of a Foreign Currency Note that is traded on
an established securities market, a United States holder that uses the cash
method of tax accounting (and, if it so elects, a United States holder that uses
the accrual method of tax accounting) will determine the U.S. dollar value of
the cost of such Note by translating the amount paid at the spot rate of
exchange on the settlement date of the purchase. The amount of any subsequent
adjustments to a United States holder's tax basis in a Foreign Currency Note in
respect of OID, market discount and premium denominated in a Specified Currency
other than the U.S. dollar will be determined in the manner described under
"Original Issue Discount," "Market Discount" and "Notes Purchased at a Premium"
below. The conversion of U.S. dollars to another Specified Currency and the
immediate use of such Specified Currency to purchase a Foreign Currency Note
generally will not result in taxable gain or loss for a United States holder.
 
    Upon the sale, exchange or retirement (collectively, a "disposition") of a
Note, a United States holder generally will recognize gain or loss equal to the
difference between the amount realized on the disposition (less any accrued
qualified stated interest, which will be taxable as ordinary income) and the
United States holder's adjusted tax basis in such Note. If a United States
holder receives a Specified Currency other than the U.S. dollar in respect of
the disposition of a Note, the amount realized will be the U.S. dollar value of
the Specified Currency received calculated at the spot rate of exchange on the
date of disposition. In the case of a Foreign Currency Note that is traded on an
established securities market, a United States holder that uses the cash method
of tax accounting, and if it so elects, a United States holder that uses the
accrual method of tax accounting will determine the U.S. dollar value of the
amount realized by translating such amount at the spot rate of exchange on the
settlement date of the disposition. The election available to accrual basis
United States holders in respect of the purchase and sale of Foreign Currency
Notes traded on an established securities market, discussed above, must be
applied consistently by the United States holder to all debt instruments from
year to year and can be changed only with the consent of the IRS.
 
    Except as discussed below with respect to market discount, Short-Term Notes
(as defined below) and foreign currency gain or loss, gain or loss recognized by
a United States holder will generally be long term capital gain or loss if the
United States holder's holding period for the Note exceeded one year at the time
of disposition.
 
    Gain or loss recognized by a United States holder on the disposition of a
Foreign Currency Note generally will be treated as ordinary income or loss to
the extent that the gain or loss is attributable to changes in exchange rates
during the period in which the holder held such Note.
 
                                      S-28

ORIGINAL ISSUE DISCOUNT
 
    IN GENERAL.  Notes with a term greater than one year may be issued with OID
for United States federal income tax purposes ("OID Notes"). For United States
federal income tax purposes, United States holders generally must accrue OID in
gross income over the term of the OID Notes on a constant yield basis,
regardless of their regular method of tax accounting. As a result, United States
holders generally will recognize taxable income in respect of an OID Note in
advance of the receipt of cash attributable to such income.
 
    OID generally will arise if the "stated redemption price at maturity" of the
Note exceeds its "issue price" by more than a DE MINIMIS amount (0.25% of the
Note's stated redemption price at maturity multiplied by the number of complete
years to maturity), or if a Note has certain interest payment characteristics
(e.g., interest holidays, interest payable in additional securities or stepped
interest). For this purpose, the "issue price" of a Note is the first price at
which a substantial amount of Notes is sold for cash (other than to bond houses,
brokers or similar persons or organizations acting in the capacity of
underwriters, placement agents or wholesalers), and the "stated redemption price
at maturity" of a Note is the sum of all payments due under the Note, other than
payments of "qualified stated interest." The term "qualified stated interest"
generally means stated interest that is unconditionally payable in cash or
property (other than debt instruments of the issuer) at least annually during
the entire term of the OID Note at a single fixed rate of interest or, subject
to certain conditions, based on one or more interest indices.
 
    For each taxable year of a United States holder, the amount of OID that must
be included in gross income in respect of an OID Note will be the sum of the
daily portions of OID for each day during such taxable year (or any portion
thereof) in which such a United States holder held the OID Note. Such daily
portions are determined by allocating to each day in an accrual period a pro
rata portion of the OID allocable to that accrual period. Accrual periods may be
of any length and may vary in length over the term of an OID Note, provided that
such accrual period is no longer than one year and each scheduled payment of
principal or interest occurs on the first day or the final day of such period.
The amount of OID allocable to any accrual period generally will equal the
product of the OID Note's "adjusted issue price" at the beginning of such
accrual period multiplied by its yield to maturity (determined on the basis of
compounding at the close of each accrual period and properly adjusted for the
length of the accrual period) and subtracting from that product the amount (if
any) of qualified stated interest allocable to that accrual period. The
"adjusted issue price" of an OID Note at the beginning of any accrual period
will equal the issue price of the OID Note, as defined above, increased by
previously accrued OID from prior accrual periods, and reduced by any payment
made on such Note (other than payments of qualified stated interest) on or
before the first day of the accrual period.
 
    FOREIGN CURRENCY NOTES.  In the case of an OID Note that is also a Foreign
Currency Note, a United States holder should determine the U.S. dollar amount
includible in income as OID for each accrual period by (a) calculating the
amount of OID allocable to each accrual period in the Specified Currency using
the constant-yield method described above, and (b) translating the amount of the
Specified Currency so derived at the average exchange rate in effect during that
accrual period (or portion thereof within a United States holder's taxable year)
or, at the United States holder's election (as described above under "PAYMENTS
OF INTEREST"), at the spot rate of exchange on (i) the last day of the accrual
period (or the last day of the taxable year within such accrual period if the
accrual period spans more than one taxable year), or (ii) on the date of
receipt, if such date is within five business days of the last day of the
accrual period. All payments on an OID Note (other than payments of qualified
stated interest) will generally be viewed first as payments of previously
accrued OID (to the extent thereof), with payments attributed first to the
earliest accrued OID, and then as payments of principal. Upon the receipt of an
amount attributable to OID (whether in connection with a payment of an amount
that is not qualified stated interest or the disposition of the OID Note), a
United States holder
 
                                      S-29

will recognize ordinary income or loss measured by the difference between the
amount received (translated into U.S. dollars at the spot rate of exchange on
the date of receipt or on the date of disposition of the OID Note, as the case
may be) and the amount accrued (using the spot rate of exchange applicable to
such previous accrual).
 
    ACQUISITION PREMIUM.  A United States holder that purchases an OID Note for
an amount less than or equal to the sum of all amounts payable on the OID Note
after the purchase date other than payments of qualified stated interest (the
"remaining redemption amount") but in excess of the OID Note's adjusted issue
price (any such excess being "acquisition premium") generally is permitted to
reduce the daily portions of OID by a fraction, the numerator of which is the
excess of the United States holder's adjusted tax basis in the OID Note
immediately after its purchase over the OID Note's adjusted issue price, and the
denominator of which is the excess of remaining redemption amount over the OID
Note's adjusted issue price.
 
    Certain of the Notes may be subject to special redemption, repayment or
interest rate reset features, as indicated in the applicable Pricing Supplement.
Notes containing such features, in particular OID Notes, may be subject to
special rules that differ from the general rules discussed above. Accordingly,
purchasers of Notes with such features should carefully examine the applicable
Pricing Supplement and should consult their tax advisors with respect to such
Notes.
 
MARKET DISCOUNT
 
    If a United States holder purchases a Note, other than a Short-Term Note (as
described below), for an amount that is less than the Note's stated redemption
price at maturity or, in the case of an OID Note, the Note's "revised issue
price" (I.E., the Note's issue price, increased by the amount of accrued OID),
the Note will be considered to have "market discount." The market discount rules
are subject to a DE MINIMIS rule similar to the rule relating to DE MINIMIS OID,
described above. Any gain recognized by the United States holder on the
disposition of Notes having market discount generally will be treated as
ordinary income to the extent of the market discount that accrued on the Note
while held by such United States holder. Alternatively, the United States holder
may elect to include market discount in income currently over the life of the
Note. Such an election will apply to market discount Notes acquired by the
United States holder on or after the first day of the first taxable year to
which such election applies and is revocable only with the consent of the IRS.
Market discount will accrue on a straight-line basis unless the United States
holder elects to accrue the market discount on a constant-yield method. Such an
election will apply to the Note to which it is made and is irrevocable. Unless
the United States holder elects to include market discount in income on a
current basis, as described above, the United States holder could be required to
defer the deduction of a portion of the interest paid on any indebtedness
incurred or maintained to purchase or carry the Note.
 
    Market discount on a Foreign Currency Note will be accrued by a United
States holder in the Specified Currency. The amount includible in income by a
United States holder in respect of such accrued market discount will be the U.S.
dollar value of the amount accrued, generally calculated at the spot rate of
exchange on the date that the Note is disposed of by the United States holder.
Any accrued market discount on a Foreign Currency Note that is currently
includible in income will be translated into U.S. dollars at the average
exchange rate for the accrual period (or portion thereof within the United
States holder's taxable year).
 
SHORT-TERM NOTES
 
    The rules set forth above also will generally apply to Notes having
maturities of not more than one year from the date of issuance ("Short-Term
Notes"), but with certain modifications.
 
    First, none of the interest on a Short-Term Note is treated as qualified
stated interest but instead is treated as part of the Short-Term Note's stated
redemption price at maturity, thereby giving rise to
 
                                      S-30

OID. Thus, all Short-Term Notes will be OID Notes. OID will be treated as
accruing on a Short-Term Note ratably, or at the election of a United States
holder, under a constant yield method.
 
    Second, a United States holder of a Short-Term Note that uses the cash
method of tax accounting will generally not be required to include OID in
respect of the Short-Term Note in income on a current basis. Such a United
States holder may not be allowed to deduct all of the interest paid or accrued
on any indebtedness incurred or maintained to purchase or carry such Note until
the maturity of the Note or its earlier disposition in a taxable transaction. In
addition, such a United States holder will be required to treat any gain
realized on a disposition of the Note as ordinary income to the extent of the
holder's accrued OID with respect to the Note. Notwithstanding the foregoing, a
United States holder of a Short-Term Note using the cash method of tax
accounting may elect to accrue OID into income on a current basis (in which case
the limitation on the deductibility of interest described above will not apply).
A United States holder using the accrual method of tax accounting generally will
be required to include OID on a Short-Term Note in income on a current basis.
 
    Third, any United States holder of a Short-Term Note (whether using the cash
or accrual method of tax accounting) can elect to accrue the "acquisition
discount," if any, with respect to the Note on a current basis. If such an
election is made, the OID rules will not apply to the Note. Acquisition discount
is the excess of the Note's stated redemption price at maturity over the
holder's purchase price for the Note. Acquisition discount will be treated as
accruing ratably or, at the election of the United States holder, under a
constant-yield method based on daily compounding.
 
    As described above, certain of the Notes may be subject to special
redemption features. These features may affect the determination of whether a
Note has a maturity of not more than one year and thus is a Short-Term Note.
Purchasers of Notes with such features should carefully examine the applicable
Pricing Supplement and should consult their tax advisors with respect to such
features.
 
NOTES PURCHASED AT A PREMIUM
 
    A United States holder that purchases a Note for an amount in excess of the
remaining redemption amount will be considered to have purchased the Note at a
premium. Such holder may elect to amortize such premium (as an offset to
interest income), using a constant-yield method, over the remaining term of the
Note. Such election, once made, generally applies to all debt instruments held
or subsequently acquired by the United States holder on or after the first
taxable year to which the election applies and may be revoked only with the
consent of the IRS. A United States holder that elects to amortize such premium
must reduce its tax basis in a Note by the amount of the premium amortized
during its holding period. With respect to a United States holder that does not
elect to amortize bond premium, the amount of such premium will be included in
the United States holder's tax basis when the Note matures or is disposed of by
the United States holder. Amortizable bond premium in respect of a Foreign
Currency Note will be computed in the Specified Currency and will reduce
interest income in the Specified Currency. At the time amortized bond premium
offsets interest income, exchange gain or loss, which will be taxable as
ordinary income or loss, will be realized with respect to amortized bond premium
on such Note based on the difference between the spot rate of exchange on the
date or dates such premium is recovered through interest payments on the Note
and the spot rate of exchange on the date on which the United States holder
acquired the Note. See "Original Issue Discount--Acquisition Premium," above for
a Note purchased for an amount less than or equal to the remaining redemption
amount but in excess of the Note's adjusted issue price.
 
INFORMATION REPORTING AND BACKUP WITHHOLDING
 
    The Trustee will be required to file information returns with the IRS with
respect to payments made to certain United States holders of Notes. In addition,
certain United States holders may be
 
                                      S-31

subject to a 31 percent backup withholding tax in respect of such payments if
they do not provide their taxpayer identification numbers to the Trustee.
 
NON-UNITED STATES HOLDERS
 
    Under current United States federal income tax law: (a) payment on a Note to
a holder who is not a United States holder (a "non-United States holder") will
not be subject to withholding of United States federal income tax, provided
that, (i) the holder does not actually or constructively own 10 percent or more
of the combined voting power of all classes of stock of the Company and is not a
controlled foreign corporation related to the Company through stock ownership
and (ii) the beneficial owner provides a statement signed under penalties of
perjury that includes its name and address and certifies that it is a non-United
States holder in compliance with applicable requirements (or, with respect to
payments made after December 31, 1999, satisfies certain documentary evidence
requirements for establishing that it is a non-United States holder); (b) a
non-United States holder will not be subject to United States federal income tax
on gain realized on the disposition of the Note. Notwithstanding the above, a
Non-United States holder that is subject to United States federal income
taxation on a net income basis generally will be subject to the same rules to
which a United States holder is subject with respect to interest payments on a
Note and with respect to gain or loss realized or recognized on the disposition
of a Note. Special rules might also apply to a Non-United States holder that is
a qualified resident of a country with which the United States has an income tax
treaty.
 
    United States information reporting requirements and backup withholding tax
will not apply to payments on a Note if the beneficial owner certifies its
non-U.S. status under penalties of perjury (or, with respect to payments made
after December 31, 1999, satisfies certain documentary evidence requirements for
establishing that it is a non-United States holder) or otherwise establishes an
exemption. Information reporting requirements and backup withholding tax will
not apply to any payment of the proceeds of the sale of a Note effected outside
the United States by a foreign office of a foreign "broker" (as defined in
applicable Treasury regulations), provided that such broker (i) derives less
than 50% of its gross income for certain periods from the conduct of a trade or
business in the United States, (ii) is not a controlled foreign corporation for
United States federal income tax purposes and (iii) with respect to payments
made after December 31, 1999, is not a foreign partnership that, at any time
during its taxable year is 50% or more (by income or capital interest) owned by
United States holders or is engaged in the conduct of a U.S. trade or business.
Payment of the proceeds of the sale of a Note effected outside the United States
by a foreign office of any other broker will not be subject to backup
withholding tax, but will be subject to information reporting requirements
unless such broker has documentary evidence in its records that the beneficial
owner is a non-United States person and certain other conditions are met, or the
beneficial owner otherwise establishes an exemption. Payment of the proceeds of
a sale of a Note by the U.S. office of a broker will be subject to information
reporting requirements and backup withholding tax unless the beneficial owner
certifies its non-U.S. status under penalties of perjury or otherwise
establishes an exemption.
 
    The U.S. Treasury Department recently issued final Treasury regulations
governing information reporting and the certification procedures regarding
withholding and backup withholding on certain amounts paid to non-United States
persons after December 31, 1999. Such regulations, among other things, may
change the certification procedures relating to the receipt by intermediaries of
payments on behalf of a beneficial owner of a Note. Prospective investors should
consult their tax advisors regarding the effect, if any, of such new Treasury
regulations on an investment in the Notes.
 
    With respect to payments made after December 31, 1999, for purposes of
applying the rules set forth in the three preceding paragraphs to an entity that
is treated as fiscally transparent (e.g., a partnership or certain trusts) for
United States federal income tax purposes, the beneficial owner means each of
the ultimate beneficial owners of the entity.
 
                                      S-32

                              PLAN OF DISTRIBUTION
 
    The Notes are being offered on a continuous basis by the Company through
            (the "Agent"), which has agreed to use its reasonable efforts to
solicit orders to purchase Notes, pursuant to a distribution agreement (the
"Distribution Agreement") between the Company and the Agent, a form of which has
been filed as an exhibit to the Registration Statement of which this Prospectus
Supplement forms a part. The Company will have the sole right to accept orders
to purchase Notes and may reject proposed purchases in whole or in part. The
Agent shall have the right, in its discretion reasonably exercised and without
notice to the Company, to reject any proposed purchase of Notes in whole or in
part. The Company reserves the right to withdraw, cancel or modify the offer
made by this Prospectus Supplement, the accompanying Prospectus or any Pricing
Supplement without notice. The Company will pay the Agent a commission of from
not more than .125% to not more than 3.000% of the principal amount of Notes
sold through it, depending upon the Stated Maturity.
 
    The Company may also sell Notes at a discount to the Agent for its own
account or for resale to one or more purchasers at varying prices related to
prevailing market prices at the time of resale or, if set forth in the
applicable Pricing Supplement, at a fixed public offering price, as determined
by the Agent. After any initial public offering of Notes to be resold to
purchasers at a fixed public offering price, the public offering price and any
concession or discount may be changed. In addition, the Agent may offer Notes
purchased by it as principal to other dealers. Notes sold by the Agent to a
dealer may be sold at a discount and, unless otherwise specified in the
applicable Pricing Supplement, such discount allowed will not be in excess of
the discount received by the Agent from the Company. Unless otherwise specified
in the applicable Pricing Supplement, any Note purchased by the Agent as
principal will be purchased at 100% of the principal amount or face amount
thereof less a percentage equal to the commission applicable to an agency sale
of a Note of identical maturity. The Agent may sell Notes that it has purchased
as principal to other dealers and such Notes may be sold at a discount which,
unless otherwise specified in the applicable Pricing Supplement, will not exceed
the discount to be received by the Agent from the Company. The Company reserves
the right to sell Notes directly to investors on its own behalf and to enter
into agreements similar to the Distribution Agreement with other parties. No
commission will be payable nor will a discount be allowed on any sales made
directly by the Company.
 
    No Note will have an established trading market when issued. Unless
otherwise specified in the applicable Pricing Supplement, the Notes will not be
listed on any securities exchange. The Agent may make a market in the Notes, but
the Agent is not obligated to do so and the Agent may discontinue any
market-making at any time without notice, at its sole discretion. There can be
no assurance of the existence or liquidity of a secondary market for any Notes,
or that the maximum amount of Notes will be sold.
 
    The Agent, whether acting as agent or principal, may be deemed to be an
"underwriter" within the meaning of the Securities Act of 1933, as amended (the
"Securities Act"). The Company has agreed to indemnify the Agent against certain
liabilities, including liabilities under the Securities Act, or to contribute to
payments that such Agent may be required to make in respect thereof and will
reimburse the Agent for certain legal and other expenses incurred by it in
connection with the offer and sale of the Notes.
 
    Unless otherwise specified in the applicable Pricing Supplement, payment of
the purchase price of the Notes will be required to be made in immediately
available funds in New York City on the date of settlement.
 
    Concurrently with the offering of Notes through the Agent as described
herein, the Company may issue other Securities pursuant to the Indenture
referred to in the Prospectus.
 
                                      S-33

    The broker-dealer subsidiaries of the Company (each a "Broker-Dealer
Subsidiary") are members of the NASD and subsidiaries of the Company, and may
participate in offerings of the Notes. Accordingly, offerings of the Notes in
which Broker-Dealer Subsidiaries participate will conform with the requirements
set forth in Rule 2720 of the Conduct Rules of the NASD.
 
    This Prospectus Supplement, the accompanying Prospectus and the related
Pricing Supplement may be used by the Agent or other affiliates of the Company
in connection with offers and sales of the Notes offered hereby in market-making
transactions at negotiated prices related to prevailing market prices at the
time of sale. The Agent or such other affiliates may act as principal or agent
in such transactions.
 
                                      S-34

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                 $6,000,000,000
 
                                     [LOGO]
 
                       MEDIUM-TERM SENIOR NOTES, SERIES A
                    MEDIUM-TERM SUBORDINATED NOTES, SERIES A
                 DUE NINE MONTHS OR MORE FROM THE DATE OF ISSUE
 
                               ------------------
 
                             PROSPECTUS SUPPLEMENT
 
                                           , 1998
 
                             (INCLUDING PROSPECTUS
                          DATED               , 1998)
 
                               ------------------
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

                 SUBJECT TO COMPLETION, DATED DECEMBER 15, 1998
 
PROSPECTUS
 
                                        SECURITIES
 
                             CITIGROUP CAPITAL
 
                               % CAPITAL SECURITIES
 
                             $  LIQUIDATION AMOUNT
                  GUARANTEED TO THE EXTENT SET FORTH HEREIN BY
                                 CITIGROUP INC.
 
                                     [LOGO]
 
                             ---------------------
 
    A brief description of the   % Capital Securities can be found under
"Summary Information-Q&A" in this Prospectus.
 
    Application will be made to list the   % Capital Securities on the New York
Stock Exchange, Inc. If approved for listing, we expect the   % Capital
Securities will begin trading on the New York Stock Exchange, Inc. within 30
days after they are first issued.
 
    WE URGE YOU TO CAREFULLY READ THE "RISK FACTORS" SECTION BEGINNING ON PAGE
7, WHERE WE DESCRIBE SPECIFIC RISKS ASSOCIATED WITH THESE       % CAPITAL
SECURITIES, ALONG WITH THE OTHER INFORMATION IN THIS PROSPECTUS BEFORE YOU MAKE
YOUR INVESTMENT DECISION.
 
    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES OR
INSURANCE COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR
DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE
CONTRARY IS A CRIMINAL OFFENSE.
 
    THE SECURITIES OFFERED HEREBY ARE NOT DEPOSITS OR SAVINGS ACCOUNTS AND ARE
NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER
GOVERNMENTAL AGENCY OR INSTRUMENTALITY.
 
                            ------------------------
 


                                                           PER CAPITAL SECURITY                 TOTAL
                                                        ---------------------------  ---------------------------
                                                                               
Public offering price.................................               $                            $
Underwriting commissions to be paid by Citigroup
  Inc.................................................              (1)                          (1)
Proceeds to Citigroup Capital.........................               $                            $

 
- ------------------------
 
(1) Underwriting commissions of $      per Capital Security (or $      for all
      % Capital Securities) will be paid by Citigroup Inc.; except that for
    sales of 10,000 or more   % Capital Securities to a single purchaser, the
    commissions will be $      per Capital Security.
 
    We expect that the   % Capital Securities will be ready for delivery in
book-entry form only through The Depository Trust Company on or about
            .
 
                            ------------------------
 
          , 1998

    YOU SHOULD ONLY RELY ON THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS. WE HAVE NOT, AND THE UNDERWRITERS HAVE NOT,
AUTHORIZED ANY OTHER PERSON TO PROVIDE YOU WITH DIFFERENT INFORMATION. IF ANYONE
PROVIDES YOU WITH DIFFERENT OR INCONSISTENT INFORMATION, YOU SHOULD NOT RELY ON
IT. WE ARE NOT, AND THE UNDERWRITERS ARE NOT, MAKING AN OFFER TO SELL THESE
SECURITIES IN ANY JURISDICTION WHERE THE OFFER OR SALE IS NOT PERMITTED. YOU
SHOULD ASSUME THAT THE INFORMATION APPEARING IN THIS PROSPECTUS, AS WELL AS
INFORMATION WE PREVIOUSLY FILED WITH THE SECURITIES AND EXCHANGE COMMISSION AND
INCORPORATED BY REFERENCE, IS ACCURATE AS OF THE DATE ON THE FRONT COVER OF THIS
PROSPECTUS ONLY. OUR BUSINESS, FINANCIAL CONDITION, RESULTS OF OPERATIONS AND
PROSPECTS MAY HAVE CHANGED SINCE THAT DATE.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 


                                                                                                                PAGE
                                                                                                                -----
                                                                                                          
Summary Information-Q&A....................................................................................           3
Risk Factors...............................................................................................           7
The Company................................................................................................          10
Use of Proceeds............................................................................................          10
Ratio of Income to Fixed Charges and Ratio of Income to Combined Fixed Charges Including Preferred Stock
  Dividends................................................................................................          11
Accounting Treatment.......................................................................................          11
Capitalization.............................................................................................          12
Description of the Capital Securities......................................................................          13
Description of the Junior Subordinated Debt Securities.....................................................          25
Description of Guarantee...................................................................................          33
Effect of Obligations Under the Junior Subordinated Debt Securities and the Guarantee......................          36
United States Federal Income Taxation......................................................................          37
ERISA Considerations.......................................................................................          41
Underwriting...............................................................................................          43
Legal Matters..............................................................................................          44
Experts....................................................................................................          44
Available Information......................................................................................          45
Incorporation of Certain Documents by Reference............................................................          46

 
                                       2

                            SUMMARY INFORMATION-Q&A
 
    The following information supplements, and should be read together with, the
information contained in other parts of this Prospectus. This summary highlights
selected information from this Prospectus to help you understand the   % Capital
Securities (the "Capital Securities"). You should carefully read this Prospectus
to understand fully the terms of the Capital Securities as well as the tax and
other considerations that are important to you in making a decision about
whether to invest in the Capital Securities. You should pay special attention to
the "Risk Factors" section beginning on page 7 of this Prospectus to determine
whether an investment in the Capital Securities is appropriate for you.
 
WHAT ARE THE CAPITAL SECURITIES?
 
    Each Capital Security represents an undivided beneficial interest in the
assets of Citigroup Capital   ("Citigroup Capital"). Each Capital Security will
entitle the holder to receive       cash distributions as described in this
Prospectus. Citigroup Capital is offering             Capital Securities at a
price of $  for each Capital Security.
 
WHO IS CITIGROUP CAPITAL?
 
    Citigroup Capital is a Delaware business trust. Its principal place of
business is c/o Citigroup Inc., 153 East 53rd Street, New York, NY 10043, and
its telephone number is (212) 559-1000.
 
    Citigroup Capital will sell its Capital Securities to the public and its
common securities (the "Common Securities") to Citigroup Inc. (formerly
Travelers Group Inc.) ("Citigroup" or the "Company"). Citigroup Capital will use
the proceeds from these sales to buy a series of   % junior subordinated
deferrable interest debentures due          , 20  (the "Junior Subordinated Debt
Securities") from Citigroup with the same financial terms as the Capital
Securities. Citigroup will guarantee payments made on the Capital Securities to
the extent described below.
 
    There are four trustees of Citigroup Capital (the "Citigroup Capital
Trustees"). Two of the trustees are employees or officers of Citigroup (the
"Regular Trustees"). The Chase Manhattan Bank will act as the Institutional
Trustee of Citigroup Capital and as Guarantee Trustee. Chase Manhattan Bank
Delaware will act as the Delaware Trustee of Citigroup Capital.
 
WHO IS CITIGROUP INC.?
 
    Citigroup's businesses provide a broad range of financial services to
consumer and corporate customers around the world. Among these businesses are
Citibank, Commercial Credit, Primerica Financial Services, Salomon Smith Barney,
SSBC Asset Management, Travelers Life & Annuity and Travelers Property Casualty.
 
    On October 8, 1998, the Company changed its name from Travelers Group Inc.
to Citigroup Inc. in connection with the merger of Citicorp into a newly formed,
wholly owned subsidiary of the Company. The mailing address of Citigroup's
principal executive office is 153 East 53rd Street, New York, NY 10043, and its
telephone number is (212) 559-1000.
 
WHEN WILL YOU RECEIVE DISTRIBUTIONS ON THE CAPITAL SECURITIES?
 
    If you purchase the Capital Securities, you are entitled to receive
cumulative cash distributions at an annual rate of   % of the liquidation amount
of $  per Capital Security. Distributions will accumulate from the date
Citigroup Capital issues the Capital Securities and will be paid       in
arrears on             of each year, beginning             .
 
                                       3

WHEN CAN PAYMENT OF YOUR DISTRIBUTIONS BE DEFERRED?
 
    So long as no event of default under the Junior Subordinated Debt Securities
has occurred and is continuing, Citigroup can, on one or more occasions, defer
interest payments on the Junior Subordinated Debt Securities for up to
  consecutive       periods. A deferral of interest payments cannot extend,
however, beyond the maturity date of the Junior Subordinated Debt Securities
(which is            , 20  ).
 
    If Citigroup defers interest payments on the Junior Subordinated Debt
Securities, Citigroup Capital will also defer distributions on the Capital
Securities. During this deferral period, distributions will continue to accrue
on the Capital Securities at an annual rate of   % of the liquidation amount of
$  per Capital Security. Also, the deferred distributions will themselves accrue
interest at an annual rate of   % (to the extent permitted by law). Once
Citigroup makes all interest payments on the Junior Subordinated Debt
Securities, with accrued interest, it can again postpone interest payments on
the Junior Subordinated Debt Securities if no event of default under the Junior
Subordinated Debt Securities has occurred and is continuing.
 
    During any period in which Citigroup defers interest payments on the Junior
Subordinated Debt Securities, Citigroup will not be permitted to (with limited
exceptions):
 
    - pay a dividend or make any distributions on its capital stock or redeem,
      purchase, acquire or make a liquidation payment on any of its capital
      stock, or make any guarantee payments with respect to the foregoing; or
 
    - make an interest, principal or premium payment on, or repurchase or
      redeem, any of its debt securities that rank equal with or junior to the
      Junior Subordinated Debt Securities.
 
    If Citigroup defers payments of interest on the Junior Subordinated Debt
Securities, the Capital Securities will be treated as being issued with original
issue discount for United States federal income tax purposes. This means you
will be required to recognize interest income with respect to distributions and
include such amounts in your gross income for United States federal income tax
purposes even though you will not have received any cash distributions relating
to such interest income. See "United States Federal Income Taxation--Interest
Income and Original Issue Discount."
 
WHEN CAN CITIGROUP CAPITAL REDEEM THE CAPITAL SECURITIES?
 
    Citigroup Capital must redeem all of the outstanding Capital Securities and
Common Securities (together, the "Trust Securities") when the Junior
Subordinated Debt Securities are paid at maturity on      , 20  . In addition,
if Citigroup redeems any Junior Subordinated Debt Securities before their
maturity, Citigroup Capital will use the cash it receives from the redemption to
redeem, on a pro rata basis, Capital Securities and Common Securities having a
combined liquidation amount equal to the principal amount of the Junior
Subordinated Debt Securities redeemed.
 
    Citigroup can redeem some or all of the Junior Subordinated Debt Securities
before their maturity at 100% of their principal amount on one or more occasions
any time on or after      , 20  . Citigroup also has the option to redeem, in
whole or in part, the Junior Subordinated Debt Securities at any time if certain
changes in tax, investment company or bank regulatory law occur and certain
other conditions are satisfied, as more fully described under "Description of
the Capital Securities-- Special Event Redemption." In any case, Citigroup will
pay accrued interest to the date of redemption. Prior to any such redemption,
Citigroup will obtain any required regulatory approvals.
 
WHAT IS CITIGROUP'S GUARANTEE OF THE CAPITAL SECURITIES?
 
    Citigroup will guarantee the Capital Securities based on:
 
    - its obligations to make payments on the Junior Subordinated Debt
      Securities;
 
                                       4

    - its obligations under the Capital Securities Guarantee (the "Guarantee");
      and
 
    - its obligations under the Amended and Restated Declaration of Trust of
      Citigroup Capital (the "Declaration"), which sets forth the terms of the
      Trust.
 
    Citigroup has irrevocably guaranteed that if a payment on the Junior
Subordinated Debt Securities is made to Citigroup Capital but, for any reason,
Citigroup Capital does not make the corresponding distribution or redemption
payment to the holders of the Capital Securities, then Citigroup will make the
payments directly to the holders of the Capital Securities. To avoid a double
payment to a holder of the Capital Securities, if Citigroup makes a payment
under the Guarantee, the holder's right to receive the corresponding payment
from Citigroup Capital will automatically be surrendered to Citigroup.
 
    Citigroup's obligations under the Guarantee are:
 
    - subordinate and junior in right of payment to its other liabilities;
 
    - equal in rank to its most senior current or future preferred stock and to
      any current or future guarantee of preferred or preference stock of any of
      its subsidiaries; and
 
    - senior to its common stock.
 
WHEN COULD THE JUNIOR SUBORDINATED DEBT SECURITIES BE DISTRIBUTED TO YOU?
 
    Citigroup has the right to dissolve Citigroup Capital at any time. Prior to
any such dissolution, Citigroup will obtain any required regulatory approvals.
If Citigroup terminates Citigroup Capital, Citigroup Capital will redeem the
Capital Securities by distributing the Junior Subordinated Debt Securities to
holders of the Capital Securities and the Common Securities on a pro rata basis.
If the Junior Subordinated Debt Securities are distributed, Citigroup will use
it best efforts to list the Junior Subordinated Debt Securities on the New York
Stock Exchange, Inc. (the "NYSE") (or any other exchange on which the Capital
Securities are then listed) in place of the Capital Securities.
 
WILL THE CAPITAL SECURITIES BE LISTED ON A STOCK EXCHANGE?
 
    Application will be made to list the Capital Securities on the NYSE. If
approved for listing, we expect the Capital Securities will begin trading on the
NYSE within 30 days after they are first issued.
 
WILL HOLDERS OF THE CAPITAL SECURITIES HAVE ANY VOTING RIGHTS?
 
    Generally, the holders of the Capital Securities will not have any voting
rights. See "Description of the Capital Securities--Voting Rights."
 
IN WHAT FORM WILL THE CAPITAL SECURITIES BE ISSUED?
 
    The Capital Securities will be represented by one or more global securities
that will be deposited with and registered in the name of The Depository Trust
Company ("DTC") or its nominee. This means that you will not receive a
certificate for your Capital Securities and that your broker will maintain your
position in the Capital Securities. Citigroup Capital expects that the Capital
Securities will be ready for delivery through DTC on or about             .
 
WHERE CAN YOU FIND MORE INFORMATION?
 
    We file annual, quarterly and current reports, proxy statements and other
information with the Securities and Exchange Commission (the "SEC"). You may
read and copy any document we file at the SEC's public reference rooms in
Washington, D.C., New York, New York and Chicago, Illinois. Please call the SEC
at 1-800-SEC-0330 for further information on the public reference rooms. SEC
filings are also available to the public from the SEC's web site at
http://www.sec.gov. If you would like
 
                                       5

additional information about our Company, please refer to the information under
"Available Information" below.
 
    The SEC allows us to "incorporate by reference" the information we file with
them, which means that we can disclose important information to you by referring
you to other documents. The information incorporated by reference is considered
to be part of this Prospectus, and later information filed with the SEC will
update and supersede this information. We incorporate by reference the documents
listed below and any future filings made with the SEC under Section 13(a),
13(c), 14, or 15(d) of the Securities Exchange Act of 1934 until our offering is
completed:
 
    (a) Annual Report on Form 10-K for the year ended December 31, 1997, as
       amended;
 
    (b) Quarterly Reports on Form 10-Q for the quarters ended March 31, 1998,
       June 30, 1998 and September 30, 1998; and
 
    (c) Current Reports on Form 8-K filed on January 6, 1998, January 26, 1998,
       February 17, 1998, April 6, 1998, April 8, 1998, April 20, 1998, June 1,
       1998, July 20, 1998, August 18, 1998, August 31, 1998, October 8, 1998,
       October 21, 1998, October 26, 1998, October 29, 1998, November 1, 1998
       and November 13, 1998.
 
    You may request a copy of these filings, at no cost, by writing or
    telephoning us at the following address:
 
    Treasurer
    Citigroup Inc.
    153 East 53(rd) Street
    New York, NY 10043
    212-559-1000
 
    You should rely only on the information incorporated by reference or
provided in this Prospectus. We have not authorized anyone to provide you with
different information. We are not making an offer of these securities in any
state where the offer is not permitted. You should not assume that the
information in this Prospectus is accurate as of any date other than the date on
the front of the document.
 
                                       6

                                  RISK FACTORS
 
    Your investment in the Capital Securities will involve certain risks. You
should carefully consider the following discussion of risks, and the other
information in this Prospectus, before deciding whether an investment in the
Capital Securities is suitable for you.
 
CITIGROUP'S OBLIGATIONS UNDER THE GUARANTEE AND THE JUNIOR SUBORDINATED DEBT
  SECURITIES ARE SUBORDINATED.
 
    Citigroup's obligations under the Junior Subordinated Debt Securities will
rank junior in priority of payment to all of Citigroup's senior indebtedness.
This means that Citigroup cannot make any payments on the Junior Subordinated
Debt Securities if it defaults on a payment of senior indebtedness and does not
cure such default within the applicable grace period or if the senior
indebtedness becomes immediately due because of a default and has not yet been
paid in full. In addition, Citigroup's obligations under the Junior Subordinated
Debt Securities will be effectively subordinated to all existing and future
liabilities of Citigroup's subsidiaries.
 
    Citigroup's obligations under the Guarantee will rank in priority of payment
as follows:
 
    - subordinate and junior in right of payment to its other liabilities;
 
    - equal in rank to its most senior current or future preferred stock and to
      any current or future guarantee of preferred or preference stock of any of
      its subsidiaries; and
 
    - senior to its common stock.
 
    This means that Citigroup cannot make any payments on the Guarantee if it
defaults on a payment on any of its other liabilities. In addition, in the event
of the bankruptcy, liquidation or dissolution of Citigroup, its assets would be
available to pay obligations under the Guarantee only after Citigroup made all
payments on its other liabilities.
 
    Neither the Capital Securities, the Junior Subordinated Debt Securities nor
the Guarantee limit the ability of Citigroup and its subsidiaries to incur
additional indebtedness, including indebtedness that ranks senior in priority of
payment to the Junior Subordinated Debt Securities and the Guarantee. See
"Description of Guarantee--Status of the Guarantee" and "Description of the
Junior Subordinated Debt Securities--Subordination."
 
THE GUARANTEE ONLY COVERS PAYMENTS IF CITIGROUP CAPITAL HAS CASH AVAILABLE.
 
    The ability of Citigroup Capital to pay scheduled distributions on the
Capital Securities, the redemption price of the Capital Securities and the
liquidation amount of each Capital Security is solely dependent upon Citigroup
making the related payments on the Junior Subordinated Debt Securities when due.
 
    If Citigroup defaults on its obligations to pay principal or interest on the
Junior Subordinated Debt Securities, Citigroup Capital will not have sufficient
funds to pay distributions, the redemption price or the liquidation amount of
each Capital Security. In those circumstances, you will not be able to rely upon
the Guarantee for payment of these amounts.
 
    Instead, you:
 
    - may directly sue Citigroup or seek other remedies to collect your pro rata
      share of payments owed; or
 
    - may rely on the Institutional Trustee to enforce Citigroup Capital's
      rights under the Junior Subordinated Debt Securities.
 
                                       7

DEFERRAL OF DISTRIBUTIONS WOULD HAVE TAX CONSEQUENCES FOR YOU AND MAY AFFECT THE
  TRADING PRICE OF THE CAPITAL SECURITIES.
 
    So long as no event of default under the Junior Subordinated Debt Securities
has occurred and is continuing, Citigroup can, on one or more occasions, defer
interest payments on the Junior Subordinated Debt Securities for up to
  consecutive             periods. If Citigroup defers interest payments on the
Junior Subordinated Debt Securities, Citigroup Capital will defer distributions
on the Capital Securities during any deferral period. However, distributions
would still accumulate and such deferred distributions would themselves accrue
interest at the annual rate of   % per annum (to the extent permitted by law).
 
    If Citigroup defers payments of interest on the Junior Subordinated Debt
Securities, you will be required to recognize interest income for United States
federal income tax purposes (based on your pro rata share of the interest on the
Junior Subordinated Debt Securities held by Citigroup Capital) before you
receive any cash relating to such interest. In addition, you will not receive
such cash if you sold the Capital Securities before the end of any deferral
period or before the record date relating to distributions which are paid.
 
    Citigroup has no current intention of deferring interest payments on the
Junior Subordinated Debt Securities and believes that such deferral is a remote
possibility. However, if Citigroup exercises its right in the future, the
Capital Securities may trade at a price that does not fully reflect the value of
accrued but unpaid interest on the Junior Subordinated Debt Securities. If you
sell the Capital Securities during an interest deferral period, you may not
receive the same return on investment as someone else who continues to hold the
Capital Securities. In addition, the existence of Citigroup's right to defer
payments of interest on the Junior Subordinated Debt Securities may mean that
the market price for the Capital Securities (which represent an undivided
beneficial interest in the Junior Subordinated Debt Securities) may be more
volatile than other securities that do not have these rights.
 
    See "United States Federal Income Taxation" for more information regarding
the tax consequences of purchasing, holding and selling the Capital Securities.
 
CAPITAL SECURITIES MAY BE REDEEMED AT ANY TIME IF CERTAIN CHANGES IN TAX,
  INVESTMENT COMPANY OR BANK REGULATORY LAW OCCUR.
 
    If certain changes in tax, investment company or bank regulatory law occur
and are continuing, and certain other conditions are satisfied, Citigroup has
the right to redeem, in whole or in part, the Junior Subordinated Debt
Securities. Any such redemption will cause a mandatory redemption of Capital
Securities and Common Securities having an aggregate liquidation amount equal to
the aggregate principal amount of Junior Subordinated Debt Securities to be
redeemed within 90 days of the event at a redemption price equal to $  per
security plus any accrued and unpaid distributions. Prior to any such
redemption, Citigroup will obtain any required regulatory approvals. See
"Description of the Capital Securities--Distribution of the Junior Subordinated
Debt Securities" and "--Special Event Redemption."
 
CAPITAL SECURITIES MAY BE REDEEMED AT THE OPTION OF THE COMPANY.
 
    At the option of the Company, the Junior Subordinated Debt Securities may be
redeemed, in whole, at any time, or in part, from time to time, on or after
      ,       at a redemption price equal to the principal amount to be redeemed
plus any accrued and unpaid interest to the redemption date. Prior to any such
redemption, Citigroup will obtain any required regulatory approvals. See
"Description of the Junior Subordinated Debt Securities--Optional Redemption."
You should assume that the Company will exercise its redemption option if the
Company is able to refinance at a lower interest rate or it is otherwise in the
interest of the Company to redeem the Junior Subordinated Debt Securities. If
the Junior Subordinated Debt Securities are redeemed, the Trust must redeem the
Capital Securities and the Common Securities having an aggregate liquidation
amount equal to the aggregate principal amount of Junior Subordinated Debt
Securities to be redeemed. See "Description of the Capital Securities--Mandatory
Redemption of Trust Securities."
 
                                       8

PENDING TAX LITIGATION MAY RESULT IN A CHANGE IN TAX LAW THAT WILL PERMIT THE
  COMPANY TO REDEEM THE JUNIOR SUBORDINATED DEBT SECURITIES.
 
    It has been reported that the Internal Revenue Service ("IRS") recently
challenged another company's deduction for interest paid on a debt instrument
similar in some respects to the Junior Subordinated Debt Securities. Based on
available information, the Company and Citigroup Capital do not believe that
this challenge will affect the Company's ability to deduct interest payments on
the Junior Subordinated Debt Securities. However, you should be aware that
further developments favoring the IRS's challenge, or other unrelated
developments, could cause a Tax Event (as described in "Description of the
Capital Securities--Special Event Redemption"). Laws and regulations have also
been proposed in the past which, if adopted retroactively, could also cause a
Tax Event.
 
THERE CAN BE NO ASSURANCE AS TO THE MARKET PRICES FOR THE CAPITAL SECURITIES OR
  THE JUNIOR SUBORDINATED DEBT SECURITIES.
 
    There can be no assurance as to the market prices for the Capital Securities
or the Junior Subordinated Debt Securities that may be distributed in exchange
for Capital Securities upon a termination of Citigroup Capital. Accordingly, the
Capital Securities that an investor may purchase, whether pursuant to the offer
made by this Prospectus or in the secondary market, or the Junior Subordinated
Debt Securities that a holder of Capital Securities may receive upon a
termination of Citigroup Capital, may trade at a discount to the price that the
investor paid to purchase the Capital Securities offered by this Prospectus. As
a result of Citigroup's right to defer interest payments on the Junior
Subordinated Debt Securities, the market price of the Capital Securities (which
represent undivided beneficial ownership interests in Citigroup Capital, the
assets of which consist solely of the Junior Subordinated Debt Securities) may
be more volatile than the market prices of other securities that are not subject
to such optional deferrals.
 
CITIGROUP MAY TERMINATE CITIGROUP CAPITAL AT ANY TIME.
 
    Subject to obtaining any required regulatory approval, Citigroup has the
right to terminate Citigroup Capital at any time. If Citigroup decides to
exercise its right to terminate Citigroup Capital, Citigroup Capital will redeem
the Capital Securities and Common Securities by distributing the Junior
Subordinated Debt Securities to holders of the Capital Securities and Common
Securities on a pro rata basis.
 
    Under current United States federal income tax law, a distribution of Junior
Subordinated Debt Securities to you on the dissolution of Citigroup Capital
should not be a taxable event to you. However, if Citigroup Capital is
characterized for United States federal income tax purposes as an association
taxable as a corporation at the time it is dissolved or if there is a change in
law, the distribution of Junior Subordinated Debt Securities to you may be a
taxable event to you.
 
    Citigroup has no current intention of causing the termination of Citigroup
Capital and the distribution of the Junior Subordinated Debt Securities.
Citigroup anticipates that it would consider exercising this right in the event
that expenses associated with maintaining Citigroup Capital were substantially
greater than currently expected, such as if certain changes in tax law,
investment company law or banking regulatory law occurred. Citigroup cannot
predict the other circumstances under which this right would be exercised.
 
    Although Citigroup will use its best efforts to list the Junior Subordinated
Debt Securities on the NYSE (or any other exchange on which the Capital
Securities are then listed) if they are distributed, we cannot assure you that
the Junior Subordinated Debt Securities will be approved for listing or that a
trading market will exist for those securities.
 
YOU HAVE LIMITED VOTING RIGHTS.
 
    You will have limited voting rights. In particular, subject to certain
exceptions, only Citigroup can elect or remove any of Citigroup Capital
Trustees. See "Description of the Capital Securities--Voting Rights."
 
                                       9

                                  THE COMPANY
 
    Citigroup's businesses provide a broad range of financial services to
consumer and corporate customers around the world. Among these businesses are
Citibank, Commercial Credit, Primerica Financial Services, Salomon Smith Barney,
SSBC Asset Management, Travelers Life & Annuity and Travelers Property Casualty.
 
    On October 8, 1998, the Company changed its name from Travelers Group Inc.
to Citigroup Inc. in connection with the merger of Citicorp into a newly formed,
wholly owned subsidiary of the Company.
 
    The Company is a holding company and services its obligations primarily with
dividends and advances that it receives from subsidiaries. Certain subsidiaries'
dividend paying abilities are limited by certain covenant restrictions in credit
agreements and/or by regulatory requirements, including those imposed by federal
bank regulatory authorities, the insurance departments of a number of states,
and various capital requirements imposed by securities regulators. The Company
is also subject to certain capital requirements as a bank holding company. Each
of the Company's major operating subsidiaries finances its operations on a
stand-alone basis consistent with its capitalization and ratings.
 
    Under longstanding policy of The Board of Governors of the Federal Reserve
System, a bank holding company is expected to act as a source of financial
strength for its subsidiary banks and to commit resources to support such banks.
As a result of that policy, the Company may be required to commit resources to
its subsidiary banks in certain circumstances.
 
    The principal office of the Company is located at 153 East 53rd Street, New
York, NY 10043, and its telephone number is (212) 559-1000.
 
                                USE OF PROCEEDS
 
    All of the net proceeds from the sale of the Capital Securities will be
invested by Citigroup Capital in Junior Subordinated Debt Securities of the
Company. The Company will use the proceeds from the sale of the Junior
Subordinated Debt Securities to Citigroup Capital for general corporate
purposes, principally to fund the business of its operating units and to fund
investments in, or extensions of credit or capital contributions to, its
subsidiaries and to lengthen the average maturity of liabilities, which may
include the reduction of short-term liabilities or the refunding of maturing
indebtedness. In order to fund its business, the Company expects to incur
additional indebtedness in the future. See "Capitalization."
 
                                       10

                   RATIO OF INCOME TO FIXED CHARGES AND RATIO
    OF INCOME TO COMBINED FIXED CHARGES INCLUDING PREFERRED STOCK DIVIDENDS
 
    The following table sets forth (i) the supplemental consolidated ratio of
income to fixed charges and (ii) the supplemental consolidated ratio of income
to combined fixed charges including preferred stock dividends of the Company for
the nine months ended September 30, 1998 and for each of the five most recent
fiscal years, after giving retroactive effect to the merger with Citicorp on
October 8, 1998 in a transaction accounted for as a pooling of interests.
 


                                                                                            YEAR ENDED DECEMBER 31,
                                                        NINE MONTHS ENDED    -----------------------------------------------------
                                                       SEPTEMBER 30, 1998      1997       1996       1995       1994       1993
                                                      ---------------------  ---------  ---------  ---------  ---------  ---------
                                                                                                       
Ratio of income to fixed charges (excluding interest
  on deposits)......................................             1.65             1.71       1.88       1.65       1.41       1.43
 
Ratio of income to fixed charges (including interest
  on deposits)......................................             1.39             1.43       1.51       1.39       1.25       1.25
 
Ratio of income to combined fixed charges including
  preferred stock dividends (excluding interest on
  deposits).........................................             1.62             1.66       1.80       1.56       1.34       1.37
 
Ratio of income to combined fixed charges including
  preferred stock dividends (including interest on
  deposits).........................................             1.37             1.41       1.48       1.35       1.21       1.22

 
                              ACCOUNTING TREATMENT
 
    The financial statements of Citigroup Capital will be reflected in the
Company's consolidated financial statements with the Capital Securities
reflected in "Company or subsidiary obligated mandatorily redeemable preferred
securities of subsidiary trusts holding solely junior subordinated debt
securities of--Company."
 
                                       11

                                 CAPITALIZATION
 
    The following table sets forth the supplemental consolidated capitalization
of the Company at September 30, 1998, after giving retroactive effect to the
merger with Citicorp on October 8, 1998 in a transaction accounted for as a
pooling of interests, and as adjusted to give effect to the issuance of the
Capital Securities.
 


                                                                                          AT SEPTEMBER 30, 1998
                                                                                         ------------------------
                                                                                         OUTSTANDING  AS ADJUSTED
                                                                                         -----------  -----------
                                                                                                
                                                                                          (DOLLARS IN MILLIONS)
Debt:
  Investment banking and brokerage borrowings..........................................   $  16,128    $
  Short-term borrowings................................................................      19,492
  Long-term debt.......................................................................      49,419
                                                                                         -----------  -----------
    Total debt.........................................................................      85,039
                                                                                         -----------  -----------
Redeemable Preferred Stock--Series I...................................................         280
                                                                                         -----------  -----------
Company or subsidiary obligated mandatorily redeemable preferred securities of
  subsidiary trusts holding solely junior subordinated debt securities of--
  Company..............................................................................       1,200
  Subsidiaries.........................................................................       2,620
Stockholders' equity:
  Capital stock at aggregate liquidation value.........................................       2,313
  Common stock and additional paid-in capital (net of treasury stock)..................       5,031
  Retained earnings....................................................................      35,746
  Accumulated other changes in equity from nonowner sources............................         593
  Unearned compensation................................................................        (593)
                                                                                         -----------  -----------
    Total stockholders' equity.........................................................      43,090
                                                                                         -----------  -----------
Total capitalization...................................................................   $ 132,229    $
                                                                                         -----------  -----------
                                                                                         -----------  -----------

 
                                       12

                     DESCRIPTION OF THE CAPITAL SECURITIES
 
    The Capital Securities will be issued pursuant to the terms of the
Declaration. The Declaration will be qualified as an indenture under the Trust
Indenture Act of 1939, as amended (the "Trust Indenture Act"). The Institutional
Trustee, The Chase Manhattan Bank, will act as indenture trustee under the
Declaration for purposes of compliance with the provisions of the Trust
Indenture Act. The terms of the Capital Securities will include those stated in
the Declaration and those made part of the Declaration by the Trust Indenture
Act. The following summary of the material terms and provisions of the Capital
Securities does not purport to be complete and is subject to, and qualified in
its entirety by reference to, the Declaration (a copy of which is filed as an
exhibit to the Registration Statement of which this Prospectus is a part), the
Business Trust Act of the State of Delaware (the "Trust Act") and the Trust
Indenture Act.
 
GENERAL
 
    The Declaration authorizes the Regular Trustees to issue on behalf of
Citigroup Capital the Trust Securities, which represent undivided beneficial
interests in the assets of Citigroup Capital. All of the Common Securities will
be owned, directly or indirectly, by the Company. The Common Securities rank
PARI PASSU, and payments will be made thereon on a PRO RATA basis, with the
Capital Securities, except that upon the occurrence and during the continuance
of a Declaration Event of Default, the rights of the holders of the Common
Securities to receive payment of periodic distributions and payments upon
liquidation, redemption and otherwise will be subordinated to the rights of the
holders of the Capital Securities. The Declaration does not permit the issuance
by Citigroup Capital of any securities other than the Trust Securities or the
incurrence of any indebtedness by Citigroup Capital. Pursuant to the
Declaration, the Institutional Trustee will hold title to the Junior
Subordinated Debt Securities purchased by Citigroup Capital for the benefit of
the holders of the Trust Securities. The payment of distributions out of money
held by Citigroup Capital, and payments upon redemption of the Capital
Securities or liquidation of Citigroup Capital out of money held by Citigroup
Capital, are guaranteed by the Company to the extent described under
"Description of Guarantee." The Guarantee will be held by The Chase Manhattan
Bank, the Guarantee Trustee, for the benefit of the holders of the Capital
Securities. The Guarantee does not cover payment of distributions when Citigroup
Capital does not have sufficient available funds to pay such distributions. In
such event, the remedy of a holder of Capital Securities is to (i) vote to
direct the Institutional Trustee to enforce the Institutional Trustee's rights
under the Junior Subordinated Debt Securities or (ii) if the failure of
Citigroup Capital to pay distributions is attributable to the failure of the
Company to pay interest or principal on the Junior Subordinated Debt Securities,
institute a proceeding directly against the Company for enforcement of payment
to such holder of the principal or interest on the Junior Subordinated Debt
Securities having a principal amount equal to the aggregate liquidation amount
of the Capital Securities of such holder on or after the respective due date
specified in the Junior Subordinated Debt Securities. See "--Voting Rights."
 
DISTRIBUTIONS
 
    Distributions on the Capital Securities will be fixed at a rate per annum of
  % of the stated liquidation amount of $  per Capital Security. Distributions
not paid when due (or would be due, if not for any Extension Period or default
by the Company on the Junior Subordinated Debt Securities) will themselves
accumulate additional interest at the annual rate of   % thereof compounded
      . The term "distribution" as used herein includes any such interest
payable unless otherwise stated. The amount of distributions payable for any
period will be computed on the basis of a 360-day year of twelve 30-day months.
 
                                       13

    Distributions on the Capital Securities will be cumulative, will accrue from
and including            , and will be payable       in arrears on
of each year, commencing      . When, as and if available for payment,
distributions will be made by the Institutional Trustee, except as otherwise
described below.
 
    The distribution rate and the distribution payment dates and other payment
dates for the Capital Securities will correspond to the interest rate and
interest payment dates and other payment dates on the Junior Subordinated Debt
Securities.
 
    The Company has the right under the Indenture to defer payments of interest
on the Junior Subordinated Debt Securities by extending the interest payment
period from time to time on the Junior Subordinated Debt Securities for an
Extension Period not exceeding   consecutive       interest periods during which
no interest shall be due and payable, PROVIDED, that no Extension Period may
extend beyond the maturity of the Junior Subordinated Debt Securities. As a
consequence of the Company's extension of the interest payment period,
distributions on the Capital Securities would be deferred (though such
distributions would continue to accrue with interest thereon compounded       ,
since interest would continue to accrue on the Junior Subordinated Debt
Securities) during any such extended interest payment period. In the event that
the Company exercises its right to extend the interest payment period, then (a)
the Company shall not declare or pay any dividend on, make any distributions
with respect to, or redeem, purchase, acquire or make a liquidation payment with
respect to, any of its capital stock or make any guarantee payment with respect
thereto (other than (i) repurchases, redemptions or other acquisitions of shares
of capital stock of the Company in connection with any employment contract,
benefit plan or other similar arrangement with or for the benefit of employees,
officers, directors or consultants, (ii) as a result of an exchange or
conversion of any class or series of the Company's capital stock for any other
class or series of the Company's capital stock, or (iii) the purchase of
fractional interests in shares of the Company's capital stock pursuant to the
conversion or exchange provisions of such capital stock or the security being
converted or exchanged), and (b) the Company shall not make any payment of
interest on or principal of (or premium, if any, on), or repay, repurchase or
redeem, any debt securities issued by the Company which rank PARI PASSU with or
junior to the Junior Subordinated Debt Securities. The foregoing, however, will
not apply to any stock dividends paid by the Company where the dividend stock is
the same stock as that on which the dividend is being paid. Prior to the
termination of any Extension Period, the Company may further extend such
Extension Period; PROVIDED, that such Extension Period, together with all such
previous and further extensions thereof, may not exceed   consecutive
      interest periods; PROVIDED FURTHER, that no Extension Period may extend
beyond the maturity of the Junior Subordinated Debt Securities. Upon the
termination of any Extension Period and the payment of all amounts then due, the
Company may commence a new Extension Period, subject to the above requirements.
Consequently, there could be up to   Extension Periods of varying lengths
throughout the term of the Junior Subordinated Debt Securities. See "Description
of the Junior Subordinated Debt Securities-- Interest" and "--Option to Extend
Interest Payment Period." The Regular Trustees shall give the holders of the
Capital Securities notice of any Extension Period upon their receipt of notice
thereof from the Company. See "Description of the Junior Subordinated Debt
Securities--Option To Extend Interest Payment Period." If distributions are
deferred, the deferred distributions and accrued interest thereon shall be paid
to holders of record of the Capital Securities as they appear on the books and
records of Citigroup Capital on the record date next following the termination
of such deferral period.
 
    Distributions on the Capital Securities will be made on the dates payable to
the extent that Citigroup Capital has funds available for the payment of such
distributions in the Property Account. Citigroup Capital's funds available for
distribution to the holders of the Capital Securities will be limited to
payments received from the Company on the Junior Subordinated Debt Securities.
See "Description of the Junior Subordinated Debt Securities." The payment of
distributions out of monies
 
                                       14

held by Citigroup Capital is guaranteed by the Company to the extent set forth
under "Description of Guarantee."
 
    Distributions on the Capital Securities will be payable to the holders named
on the securities register of Citigroup Capital at the close of business on the
relevant record dates, which, as long as the Capital Securities remain in
book-entry only form, will be one Business Day prior to the relevant payment
dates. Such distributions will be paid through the Institutional Trustee who
will hold amounts received in respect of the Junior Subordinated Debt Securities
in the Property Account for the benefit of the holders of the Trust Securities.
Subject to any applicable laws and regulations and the provisions of the
Declaration, each such payment will be made as described under "--Book-Entry
Only Issuance--The Depository Trust Company" below. In the event that the
Capital Securities do not continue to remain in book-entry only form, the
relevant record dates shall conform to the rules of any securities exchange on
which the Capital Securities are listed and, if none, the Regular Trustees shall
have the right to select relevant record dates, which shall be more than 14 days
but less than 60 days prior to the relevant payment dates. In the event that any
date on which distributions are to be made on the Capital Securities is not a
Business Day, then payment of the distributions payable on such date will be
made on the next succeeding day which is a Business Day (and without any
interest or other payment in respect of any such delay), except that, if such
Business Day is in the next succeeding calendar year, such payment shall be made
on the immediately preceding Business Day, in each case with the same force and
effect as if made on such record date. A "Business Day" shall mean any day other
than Saturday, Sunday or any other day on which banking institutions in New York
City (in the State of New York) are permitted or required by any applicable law
to close.
 
MANDATORY REDEMPTION OF TRUST SECURITIES
 
    The Capital Securities have no stated maturity date but will be redeemed
upon the maturity of the Junior Subordinated Debt Securities or to the extent
the Junior Subordinated Debt Securities are redeemed. The Junior Subordinated
Debt Securities will mature on      , 20  , and may be redeemed, in whole or in
part, at any time on or after             , or at any time, in whole or in part,
in certain circumstances upon the occurrence of a Tax Event, an Investment
Company Event or a Regulatory Capital Event (as described under "Special Event
Redemption" below). See "Description of the Junior Subordinated Debt
Securities--Optional Redemption." Upon the maturity of the Junior Subordinated
Debt Securities, the proceeds of the repayment thereof shall simultaneously be
applied to redeem all outstanding Trust Securities at the Redemption Price. Upon
the redemption of the Junior Subordinated Debt Securities, whether in whole or
in part (either at the option of the Company or pursuant to a Tax Event, an
Investment Company Event or a Regulatory Capital Event), the proceeds from such
redemption shall simultaneously be applied to redeem Trust Securities having an
aggregate liquidation amount equal to the aggregate principal amount of the
Junior Subordinated Debt Securities so redeemed at the Redemption Price;
PROVIDED, that holders of Trust Securities shall be given not less than 30 nor
more than 60 days' notice of such redemption. In the event that fewer than all
of the outstanding Capital Securities are to be redeemed, the Capital Securities
will be redeemed PRO RATA as described under "--Book-Entry Only Issuance--The
Depository Trust Company" below.
 
SPECIAL EVENT REDEMPTION
 
    "Tax Event" means that the Regular Trustees shall have received an opinion
of a nationally recognized independent tax counsel experienced in such matters
(a "Dissolution Tax Opinion") to the effect that, as a result of (a) any
amendment to, or change (including any announced prospective change) in, the
laws (or any regulations thereunder) of the United States or any political
subdivision or taxing authority thereof or therein or (b) any amendment to or
change in an interpretation or application of such laws or regulations by any
legislative body, court, governmental agency or regulatory authority (including
the enactment of any legislation and the publication of any judicial decision or
regulatory
 
                                       15

determination on or after the date of this Prospectus), in either case after the
date of this Prospectus, there is more than an insubstantial risk that (i)
Citigroup Capital would be subject to United States federal income tax with
respect to income accrued or received on the Junior Subordinated Debt
Securities, (ii) interest payable to Citigroup Capital on the Junior
Subordinated Debt Securities would not be deductible, in whole or in part, by
the Company for United States federal income tax purposes or (iii) Citigroup
Capital would be subject to more than a DE MINIMIS amount of other taxes, duties
or other governmental charges.
 
    "Investment Company Event" means that the Regular Trustees shall have
received an opinion of a nationally recognized independent counsel experienced
in practicing under the 1940 Act (as defined herein) to the effect that, as a
result of the occurrence of a change in law or regulation or a written change in
interpretation or application of law or regulation by any legislative body,
court, governmental agency or regulatory authority (a "Change in 1940 Act Law"),
there is more than an insubstantial risk that Citigroup Capital is or will be
considered an "investment company" which is required to be registered under the
Investment Company Act of 1940, as amended (the "1940 Act"), which Change in
1940 Act Law becomes effective on or after the date of this Prospectus.
 
    "Regulatory Capital Event" means a determination by Citigroup, based on an
opinion of counsel experienced in such matters (who may be an employee of
Citigroup or any of its affiliates), that, as a result of (a) any amendment to,
clarification of or change (including any announced prospective change) in
applicable laws or regulations or official interpretations thereof or policies
with respect thereto or (b) any official administrative pronouncement or
judicial decision interpreting or applying such laws or regulations, which
amendment, clarification, change, pronouncement or decision is announced or is
effective after the date of this Prospectus, there is more than an insubstantial
risk that the Capital Securities will no longer constitute Tier I Capital of
Citigroup or any bank holding company of which Citigroup is a subsidiary (or its
equivalent) for purposes of the capital adequacy guidelines or policies of the
Board of Governors of the Federal Reserve System or its successor as Citigroup's
primary federal banking regulator.
 
    Subject to obtaining any required regulatory approval, if a Tax Event, an
Investment Company Event or a Regulatory Capital Event (each, a "Special Event")
shall occur and be continuing, the Company shall have the right, upon not less
than 30 nor more than 60 days' notice, to redeem the Junior Subordinated Debt
Securities, in whole or in part, for cash within 90 days following the
occurrence of such Special Event, and, following such redemption, Trust
Securities with an aggregate liquidation amount equal to the aggregate principal
amount of the Junior Subordinated Debt Securities so redeemed shall be redeemed
by Citigroup Capital at the Redemption Price on a PRO RATA basis; PROVIDED,
HOWEVER, that if at the time there is available to the Company or Citigroup
Capital the opportunity to eliminate, within such 90-day period, the Special
Event by taking some ministerial action, such as filing a form or making an
election or pursuing some other similar reasonable measure that will have no
adverse effect on Citigroup Capital, the Company or the holders of the Trust
Securities, then the Company or Citigroup Capital will pursue such measure in
lieu of redemption.
 
DISTRIBUTION OF THE JUNIOR SUBORDINATED DEBT SECURITIES
 
    Citigroup will have the right at any time to dissolve Citigroup Capital and,
after satisfaction of the liabilities of creditors of Citigroup Capital as
provided by applicable law, to cause Junior Subordinated Debt Securities to be
distributed to the holders of the Capital Securities in an aggregate stated
principal amount equal to the aggregate stated liquidation amount of the Capital
Securities then outstanding. Prior to any such dissolution, Citigroup will
obtain any required regulatory approvals.
 
    If the Junior Subordinated Debt Securities are distributed to the holders of
the Capital Securities, the Company will use its best efforts to cause the
Junior Subordinated Debt Securities to be listed on the NYSE or on such other
exchange as the Capital Securities are then listed.
 
                                       16

    After the date for any distribution of Junior Subordinated Debt Securities
upon dissolution of Citigroup Capital, (i) the Capital Securities will no longer
be deemed to be outstanding, (ii) the securities depositary or its nominee, as
the record holder of the Capital Securities, will receive a registered global
certificate or certificates representing the Junior Subordinated Debt Securities
to be delivered upon such distribution, and (iii) any certificates representing
Capital Securities not held by the Depositary or its nominee will be deemed to
represent Junior Subordinated Debt Securities having an aggregate principal
amount equal to the aggregate stated liquidation amount of, with an interest
rate identical to the distribution rate of, and with accrued and unpaid interest
equal to accrued and unpaid distributions on, such Capital Securities until such
certificates are presented to the Company or its agent for transfer or
reissuance.
 
    There can be no assurance as to the market prices for either the Capital
Securities or the Junior Subordinated Debt Securities that may be distributed in
exchange for the Capital Securities if a dissolution and liquidation of
Citigroup Capital were to occur. Accordingly, the Capital Securities that an
investor may purchase, whether pursuant to the offer made hereby or in the
secondary market, or the Junior Subordinated Debt Securities that an investor
may receive if a dissolution and liquidation of Citigroup Capital were to occur,
may trade at a discount to the price that the investor paid to purchase the
Capital Securities offered hereby.
 
REDEMPTION PROCEDURES
 
    Citigroup Capital may not redeem fewer than all of the outstanding Capital
Securities unless all accrued and unpaid distributions have been paid on all
Capital Securities for all       distribution periods terminating on or prior to
the date of redemption.
 
    If Citigroup Capital gives a notice of redemption in respect of the Capital
Securities (which notice will be irrevocable), then, by 12:00 noon, New York
City time, on the redemption date, and if the Company has paid to the
Institutional Trustee a sufficient amount of cash in connection with the related
redemption or maturity of the Junior Subordinated Debt Securities, the
Institutional Trustee will irrevocably deposit with the Depositary (as defined
below) funds sufficient to pay the applicable Redemption Price and will give the
Depositary irrevocable instructions and authority to pay the Redemption Price to
the holders of the Capital Securities. See "--Book-Entry Only Issuance--The
Depository Trust Company." If notice of redemption shall have been given and
funds deposited as required, then, immediately prior to the close of business on
the date of such deposit, distributions will cease to accrue and all rights of
holders of Capital Securities so called for redemption will cease, except the
right of the holders of such Capital Securities to receive the Redemption Price
but without interest on such Redemption Price. In the event that any date fixed
for redemption of Capital Securities is not a Business Day, then payment of the
Redemption Price payable on such date will be made on the next succeeding day
that is a Business Day (without any interest or other payment in respect of any
such delay), except that, if such Business Day falls in the next calendar year,
such payment will be made on the immediately preceding Business Day. In the
event that payment of the Redemption Price in respect of Capital Securities is
improperly withheld or refused and not paid either by Citigroup Capital, or by
the Company pursuant to the Guarantee, distributions on such Capital Securities
will continue to accrue at the then applicable rate from the original redemption
date to the date of payment, in which case the actual payment date will be
considered the date fixed for redemption for purposes of calculating the
Redemption Price.
 
    In the event that fewer than all of the outstanding Capital Securities are
to be redeemed, the Capital Securities will be redeemed in accordance with the
Depositary's standard procedures. See "--Book-Entry Only Issuance--The
Depository Trust Company."
 
                                       17

    Subject to the foregoing and applicable law (including, without limitation,
United States federal securities laws), the Company or its subsidiaries may at
any time, and from time to time, purchase outstanding Capital Securities by
tender, in the open market or by private agreement.
 
LIQUIDATION DISTRIBUTION UPON DISSOLUTION
 
    In the event of any voluntary or involuntary liquidation, dissolution,
winding-up or termination of Citigroup Capital (each a "Liquidation"), the
holders of the Capital Securities will be entitled to receive out of the assets
of Citigroup Capital, after satisfaction of liabilities to creditors,
distributions in an amount equal to the aggregate of the stated liquidation
amount of $  per Capital Security plus accrued and unpaid distributions thereon
to the date of payment (the "Liquidation Distribution"), unless, in connection
with such Liquidation, Junior Subordinated Debt Securities in an aggregate
stated principal amount equal to the aggregate stated liquidation amount of,
with an interest rate identical to the distribution rate of, and with accrued
and unpaid interest equal to accrued and unpaid distributions on, the Capital
Securities outstanding at such time have been distributed on a PRO RATA basis to
the holders of such Capital Securities. See "--Distribution of the Junior
Subordinated Debt Securities."
 
    If, upon any such Liquidation, the Liquidation Distribution can be paid only
in part because Citigroup Capital has insufficient assets available to pay in
full the aggregate Liquidation Distribution, then the amounts payable directly
by Citigroup Capital on the Capital Securities shall be paid on a PRO RATA
basis. The holders of the Common Securities will be entitled to receive
distributions upon any such Liquidation PRO RATA with the holders of the Capital
Securities, except that if a Declaration Event of Default has occurred and is
continuing the Capital Securities shall have a preference over the Common
Securities with regard to such distributions.
 
    Pursuant to the Declaration, Citigroup Capital shall terminate (i) on
            , 20  , the expiration of the term of the Trust, (ii) upon the
bankruptcy of the Company or the holder of the Common Securities, (iii) upon the
filing of a certificate of dissolution or its equivalent with respect to the
holder of the Common Securities or the Company, the filing of a certificate of
cancellation with respect to Citigroup Capital, or the revocation of the charter
of the holder of the Common Securities or the Company and the expiration of 90
days after the date of revocation without a reinstatement thereof, (iv) upon the
distribution of Junior Subordinated Debt Securities to holders of Capital
Securities upon exercise of the Company's right to dissolve Citigroup Capital at
any time and distribute Junior Subordinated Debt Securities to holders of
Capital Securities, (v) upon the entry of a decree of a judicial dissolution of
the holder of the Common Securities, the Company or Citigroup Capital, or (vi)
upon the redemption of all the Trust Securities.
 
DECLARATION EVENTS OF DEFAULT
 
    An event of default under the Indenture (an "Indenture Event of Default")
constitutes an event of default under the Declaration with respect to the Trust
Securities (a "Declaration Event of Default"); PROVIDED, that pursuant to the
Declaration the holder of the Common Securities will be deemed to have waived
any Declaration Event of Default with respect to the Common Securities until all
Declaration Events of Default with respect to the Capital Securities have been
cured, waived or otherwise eliminated. Until such Declaration Events of Default
with respect to the Capital Securities have been so cured, waived, or otherwise
eliminated, the Institutional Trustee will be deemed to be acting solely on
behalf of the holders of the Capital Securities and only the holders of the
Capital Securities will have the right to direct the Institutional Trustee with
respect to certain matters under the Declaration, and therefore the Indenture.
In the event that any Declaration Event of Default with respect to the Capital
Securities is waived by the holders of the Capital Securities as provided in the
Declaration, the holders of Common Securities pursuant to the Declaration have
agreed that such waiver also constitutes a waiver of such Declaration Event of
Default with respect to the Common Securities for all purposes
 
                                       18

under the Declaration without any further act, vote or consent of the holders of
Common Securities. See "--Voting Rights."
 
    If the Institutional Trustee fails to enforce its rights under the Junior
Subordinated Debt Securities, any holder of Capital Securities may directly
institute a legal proceeding against the Company to enforce the Institutional
Trustee's rights under the Junior Subordinated Debt Securities without first
instituting any legal proceeding against the Institutional Trustee or any other
person or entity. If a Declaration Event of Default has occurred and is
continuing and such event is attributable to the failure of the Company to pay
interest or principal on the Junior Subordinated Debt Securities on the date
such interest or principal is otherwise payable (or in the case of redemption,
the redemption date), then a holder of Capital Securities may also directly
institute a proceeding for enforcement of payment to such holder of the
principal of or interest on the Junior Subordinated Debt Securities having a
principal amount equal to the aggregate liquidation amount of the Capital
Securities of such holder on or after the respective due date specified in the
Junior Subordinated Debt Securities without first (i) directing the
Institutional Trustee to enforce the terms of the Junior Subordinated Debt
Securities or (ii) instituting a legal proceeding against the Company to enforce
the Institutional Trustee's rights under the Junior Subordinated Debt
Securities. In connection with such Direct Action, the Company will be
subrogated to the rights of such holder of Capital Securities under the
Declaration to the extent of any payment made by the Company to such holder of
Capital Securities in such Direct Action. Consequently, the Company will be
entitled to payment of amounts that a holder of Capital Securities receives in
respect of an unpaid distribution that resulted in the bringing of a Direct
Action to the extent that such holder receives or has already received full
payment with respect to such unpaid distribution from Citigroup Capital. The
holders of Capital Securities will not be able to exercise directly any other
remedy available to the holders of the Junior Subordinated Debt Securities.
 
    Upon the occurrence of an Indenture Event of Default, the Institutional
Trustee as the sole holder of the Junior Subordinated Debt Securities will have
the right under the Indenture to declare the principal of and interest on the
Junior Subordinated Debt Securities to be immediately due and payable. The
Company and Citigroup Capital are each required to file annually with the
Institutional Trustee an officers' certificate as to its compliance with all
conditions and covenants under the Declaration.
 
VOTING RIGHTS
 
    Except as described in this Prospectus under "Description of
Guarantee--Modification of Guarantee; Assignment," and except as provided under
the Trust Act, the Trust Indenture Act and as otherwise required by law and the
Declaration, the holders of the Capital Securities will have no voting rights.
 
    Subject to the requirement of the Institutional Trustee obtaining a tax
opinion in certain circumstances set forth in the last sentence of this
paragraph, the holders of a majority in aggregate liquidation amount of the
Capital Securities have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Institutional Trustee,
or direct the exercise of any trust or power conferred upon the Institutional
Trustee under the Declaration including the right to direct the Institutional
Trustee, as holder of the Junior Subordinated Debt Securities, to (i) direct the
time, method and place of conducting any proceeding for any remedy available to
the Indenture Trustee, or exercising any trust or power conferred on the
Indenture Trustee with respect to the Junior Subordinated Debt Securities, (ii)
waive any past Indenture Event of Default that is waivable under Section 5.13 of
the Indenture, (iii) exercise any right to rescind or annul a declaration that
the principal of all the Junior Subordinated Debt Securities shall be due and
payable, or (iv) consent to any amendment, modification or termination of the
Indenture or the Junior Subordinated Debt Securities where such consent shall be
required; PROVIDED, HOWEVER, that, where a consent or action under the Indenture
would require the consent or act of holders of more than a majority in principal
amount of the Junior
 
                                       19

Subordinated Debt Securities (a "Super Majority") affected thereby, only the
holders of at least such Super Majority in aggregate liquidation amount of the
Capital Securities may direct the Institutional Trustee to give such consent or
take such action. If the Institutional Trustee fails to enforce its rights under
the Junior Subordinated Debt Securities, any record holder of Capital Securities
may directly institute a legal proceeding against the Company to enforce the
Institutional Trustee's rights under the Junior Subordinated Debt Securities
without first instituting any legal proceeding against the Institutional Trustee
or any other person or entity. The Institutional Trustee shall notify all
holders of the Capital Securities of any notice of default received from the
Indenture Trustee with respect to the Junior Subordinated Debt Securities. Such
notice shall state that such Indenture Event of Default also constitutes a
Declaration Event of Default. Except with respect to directing the time, method
and place of conducting a proceeding for a remedy available to the Institutional
Trustee, the Institutional Trustee, as holder of the Junior Subordinated
Debentures, shall not take any of the actions described in clauses (i), (ii),
(iii) or (iv) above unless the Institutional Trustee has obtained an opinion of
a nationally recognized independent tax counsel experienced in such matters to
the effect that, as a result of such action, Citigroup Capital will not fail to
be classified as a grantor trust for United States federal income tax purposes.
 
    In the event the consent of the Institutional Trustee, as the holder of the
Junior Subordinated Debt Securities, is required under the Indenture with
respect to any amendment, modification or termination of the Indenture, the
Institutional Trustee shall request the written direction of the holders of the
Trust Securities with respect to such amendment, modification or termination and
shall vote with respect to such amendment, modification or termination as
directed by a majority in liquidation amount of the Trust Securities voting
together as a single class; PROVIDED, HOWEVER, that where any amendment,
modification or termination under the Indenture would require the consent of a
Super Majority, the Institutional Trustee may only give such consent at the
direction of the holders of at least the proportion in aggregate liquidation
amount of the Trust Securities which the relevant Super Majority represents of
the aggregate principal amount of the Junior Subordinated Debt Securities
outstanding. The Institutional Trustee shall be under no obligation to take any
such action in accordance with the directions of the holders of the Trust
Securities unless the Institutional Trustee has obtained an opinion of a
nationally recognized independent tax counsel experienced in such matters to the
effect that for United States federal income tax purposes Citigroup Capital will
not be classified as other than a grantor trust.
 
    A waiver of an Indenture Event of Default by the Institutional Trustee at
the direction of the holders of the Capital Securities will constitute a waiver
of the corresponding Declaration Event of Default.
 
    Any required approval or direction of holders of Capital Securities may be
given at a separate meeting of holders of Capital Securities convened for such
purpose, at a meeting of all of the holders of Trust Securities or pursuant to
written consent. The Regular Trustees will cause a notice of any meeting at
which holders of Capital Securities are entitled to vote, or of any matter upon
which action by written consent of such holders is to be taken, to be mailed to
each holder of record of Capital Securities. Each such notice will include a
statement setting forth the following information: (i) the date of such meeting
or the date by which such action is to be taken; (ii) a description of any
resolution proposed for adoption at such meeting on which such holders are
entitled to vote or of such matter upon which written consent is sought; and
(iii) instructions for the delivery of proxies or consents. No vote or consent
of the holders of Capital Securities will be required for Citigroup Capital to
redeem and cancel Capital Securities or distribute Junior Subordinated Debt
Securities in accordance with the Declaration.
 
    Notwithstanding that holders of Capital Securities are entitled to vote or
consent under any of the circumstances described above, any of the Capital
Securities that are owned at such time by the Company or any entity directly or
indirectly controlling or controlled by, or under direct or indirect
 
                                       20

common control with, the Company, shall not be entitled to vote or consent and
shall, for purposes of such vote or consent, be treated as if such Capital
Securities were not outstanding.
 
    The procedures by which holders of Capital Securities may exercise their
voting rights are described below. See "--Book-Entry Only Issuance--The
Depository Trust Company."
 
    Except in certain circumstances, holders of the Capital Securities will have
no rights to appoint or remove the Citigroup Trustees, who may be appointed,
removed or replaced solely by the Company as the indirect or direct holder of
all of the Common Securities.
 
MODIFICATION OF THE DECLARATION
 
    The Declaration may be modified and amended if approved by the Regular
Trustees (and in certain circumstances the Institutional Trustee and the
Delaware Trustee), PROVIDED, that, if any proposed amendment provides for, or
the Regular Trustees otherwise propose to effect, (i) any action that would
adversely affect the powers, preferences or special rights of the Trust
Securities, whether by way of amendment to the Declaration or otherwise or (ii)
the dissolution, winding-up or termination of Citigroup Capital other than
pursuant to the terms of the Declaration, then the holders of the Trust
Securities voting together as a single class will be entitled to vote on such
amendment or proposal and such amendment or proposal shall not be effective
except with the approval of holders of at least a majority in liquidation amount
of the Trust Securities affected thereby; PROVIDED, that, if any amendment or
proposal referred to in clause (i) above would adversely affect only the Capital
Securities or the Common Securities, then only holders of the affected class
will be entitled to vote on such amendment or proposal and such amendment or
proposal shall not be effective except with the approval of holders of a
majority in liquidation amount of such class of Trust Securities.
 
    Notwithstanding the foregoing, no amendment or modification may be made to
the Declaration if such amendment or modification would (i) cause Citigroup
Capital to be classified for United States federal income tax purposes as other
than a grantor trust, (ii) reduce or otherwise adversely affect the powers of
the Institutional Trustee or (iii) cause Citigroup Capital to be deemed an
"investment company" which is required to be registered under the 1940 Act.
 
MERGERS, CONSOLIDATIONS OR AMALGAMATIONS
 
    Citigroup Capital may not consolidate, amalgamate, merge with or into, or be
replaced by, or convey, transfer or lease its properties and assets
substantially as an entirety, to any corporation or other body except as
described below. Citigroup Capital may, with the consent of the Regular Trustees
and without the consent of the holders of the Trust Securities, consolidate,
amalgamate, merge with or into, or be replaced by a trust organized as such
under the laws of any State; PROVIDED, that (i) such successor entity either (x)
expressly assumes all of the obligations of Citigroup Capital under the Trust
Securities or (y) substitutes for the Capital Securities other securities having
substantially the same terms as the Trust Securities (the "Successor
Securities"), so long as the Successor Securities rank the same as the Trust
Securities rank with respect to distributions and payments upon liquidation,
redemption and otherwise, (ii) the Company expressly acknowledges a trustee of
such successor entity possessing the same powers and duties as the Institutional
Trustee, in its capacity as the holder of the Junior Subordinated Debt
Securities, (iii) the Capital Securities or any Successor Securities are listed,
or any Successor Securities will be listed upon notification of issuance, on any
national securities exchange or with another organization on which the Capital
Securities are then listed or quoted, (iv) such merger, consolidation,
amalgamation or replacement does not cause the Capital Securities (including any
Successor Securities) to be downgraded by any nationally recognized statistical
rating organization, (v) such merger, consolidation, amalgamation or replacement
does not adversely affect the rights, preferences and privileges of the holders
of the Trust Securities (including any Successor Securities) in any material
respect (other than with respect to any dilution of the holders' interest in the
new entity), (vi) such
 
                                       21

successor entity has a purpose identical to that of Citigroup Capital, (vii)
prior to such merger, consolidation, amalgamation or replacement, Citigroup
Capital has received an opinion of a nationally recognized independent counsel
to Citigroup Capital experienced in such matters to the effect that, (A) such
merger, consolidation, amalgamation or replacement does not adversely affect the
rights, preferences and privileges of the holders of the Trust Securities
(including any Successor Securities) in any material respect (other than with
respect to any dilution of the holders' interest in the new entity), and (B)
following such merger, consolidation, amalgamation or replacement, neither
Citigroup Capital nor such successor entity will be required to register as an
"investment company" under the 1940 Act; and (viii) the Company guarantees the
obligations of such successor entity under the Successor Securities at least to
the extent provided by the Guarantee. Notwithstanding the foregoing, Citigroup
Capital shall not, except with the consent of holders of 100% in liquidation
amount of the Trust Securities, consolidate, amalgamate, merge with or into, or
be replaced by any other entity or permit any other entity to consolidate,
amalgamate, merge with or into, or replace it, if in the opinion of a nationally
recognized independent tax counsel experienced in such matters, such
consolidation, amalgamation, merger or replacement would cause Citigroup Capital
or the Successor Entity to be classified as other than a grantor trust for
United States federal income tax purposes.
 
BOOK-ENTRY ONLY ISSUANCE--THE DEPOSITORY TRUST COMPANY
 
    The Depository Trust Company ("DTC") will act as securities depositary for
the Capital Securities. The Capital Securities will be issued only as
fully-registered securities registered in the name of Cede & Co. (DTC's
nominee). One or more fully-registered global Capital Securities certificates,
representing the total aggregate number of Capital Securities, will be issued
and will be deposited with DTC. This means that Citigroup Capital will not issue
certificates to the purchasers for the Capital Securities.
 
    The laws of some jurisdictions require that certain purchasers of securities
take physical delivery of securities in definitive form. Such laws may impair
the ability to transfer beneficial interests in the global Capital Securities as
represented by a global certificate.
 
    DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law, a
member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"). DTC holds securities that its
participants ("Participants") deposit with DTC. DTC also facilitates the
settlement among Participants of securities transactions, such as transfers and
pledges, in deposited securities through electronic computerized book-entry
changes in Participants' accounts, thereby eliminating the need for physical
movement of securities certificates. Direct Participants include securities
brokers and dealers, banks, trust companies, clearing corporations and certain
other organizations ("Direct Participants"). DTC is owned by a number of its
Direct Participants and by the NYSE and The Nasdaq-Amex Market Group. Access to
the DTC system is also available to others, such as securities brokers and
dealers, banks and trust companies that clear transactions through or maintain a
direct or indirect custodial relationship with a Direct Participant either
directly or indirectly ("Indirect Participants"). The rules applicable to DTC
and its Participants are on file with the Securities and Exchange Commission.
 
    Purchases of Capital Securities within the DTC system must be made by or
through Direct Participants, which will receive a credit for the Capital
Securities on DTC's records. The ownership interest of each actual purchaser of
each Capital Security ("Beneficial Owner") is in turn to be recorded on the
Direct and Indirect Participants' records. Beneficial Owners will not receive
written confirmation from DTC of their purchases, but Beneficial Owners are
expected to receive written confirmations providing details of the transactions,
as well as periodic statements of their holdings, from the Direct or Indirect
Participants through which the Beneficial Owners purchased Capital Securities.
Transfers of ownership
 
                                       22

interests in the Capital Securities are to be accomplished by entries made on
the books of Participants acting on behalf of Beneficial Owners. Beneficial
Owners will not receive certificates representing their ownership interests in
the Capital Securities, except in the event that use of the book-entry system
for the Capital Securities is discontinued.
 
    To facilitate subsequent transfers, all the Capital Securities deposited by
Participants with DTC are registered in the name of DTC's nominee, Cede & Co.
The deposit of Capital Securities with DTC and their registration in the name of
Cede & Co. effect no change in beneficial ownership. DTC has no knowledge of the
actual Beneficial Owners of the Capital Securities. DTC's records reflect only
the identity of the Direct Participants to whose accounts such Capital
Securities are credited, which may or may not be the Beneficial Owners. The
Participants will remain responsible for keeping account of their holdings on
behalf of their customers.
 
    Conveyance of notices and other communications by DTC to Direct
Participants, by Direct Participants to Indirect Participants and by Direct
Participants and Indirect Participants to Beneficial Owners will be governed by
arrangements among them, subject to any statutory or regulatory requirements
that may be in effect from time to time.
 
    Any redemption notices will be sent by Citigroup Capital to Cede & Co. DTC
will then inform the Direct Participants, who will then contact the Beneficial
Owners. If less than all of the Capital Securities are being redeemed, DTC will
reduce the amount of the interest of each Direct Participant in such Capital
Securities in accordance with its procedures.
 
    Although voting with respect to the Capital Securities is limited, in those
cases where a vote is required, neither DTC nor Cede & Co. will itself consent
or vote with respect to Capital Securities. Under its usual procedures, DTC
would mail an Omnibus Proxy to Citigroup Capital as soon as possible after the
record date. The Omnibus Proxy assigns Cede & Co. consenting or voting rights to
those Direct Participants to whose accounts the Capital Securities are credited
on the record date (identified in a listing attached to the Omnibus Proxy). The
Company and Citigroup Capital believe that the arrangements among DTC, Direct
and Indirect Participants, and Beneficial Owners will enable the Beneficial
Owners to exercise rights equivalent in substance to the rights that can be
directly exercised by a holder of a beneficial interest in Citigroup Capital.
 
    Distribution payments on the Capital Securities will be made to DTC. DTC's
practice is to credit Direct Participants' accounts on the relevant payment date
in accordance with their respective holdings shown on DTC's records unless DTC
has reason to believe that it will not receive payments on such payment date.
Payments by Participants to Beneficial Owners will be governed by standing
instructions and customary practices, as is the case with securities held for
the account of customers in bearer form or registered in "street name," and such
payments will be the responsibility of such Participant and not of DTC,
Citigroup Capital or the Company, subject to any statutory or regulatory
requirements to the contrary that may be in effect from time to time. Payment of
distributions to DTC is the responsibility of Citigroup Capital, disbursement of
such payments to Direct Participants is the responsibility of DTC, and
disbursement of such payments to the Beneficial Owners is the responsibility of
Direct and Indirect Participants.
 
    Except as provided herein, a Beneficial Owner in a global Capital Security
certificate will not be entitled to receive physical delivery of Capital
Securities. Accordingly, each Beneficial Owner must rely on the procedures of
DTC to exercise any rights under the Capital Securities.
 
    DTC may discontinue providing its services as securities depositary with
respect to the Capital Securities at any time by giving reasonable notice to
Citigroup Capital. Under such circumstances, in the event that a successor
securities depositary is not obtained, Capital Securities certificates are
required to be printed and delivered. Additionally, the Regular Trustees (with
the consent of the Company) may decide to discontinue use of the system of
book-entry transfers through DTC (or any
 
                                       23

successor depositary) with respect to the Capital Securities. In that event,
certificates for the Capital Securities will be printed and delivered.
 
    The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that the Company and Citigroup Capital believe to
be reliable, but neither the Company nor Citigroup Capital takes responsibility
for the accuracy thereof.
 
INFORMATION CONCERNING THE INSTITUTIONAL TRUSTEE
 
    The Institutional Trustee, prior to the occurrence of a default with respect
to the Trust Securities, undertakes to perform only such duties as are
specifically set forth in the Declaration and, after such a default, shall
exercise the same degree of care as a prudent individual would exercise in the
conduct of his or her own affairs. Subject to such provisions, the Institutional
Trustee is under no obligation to exercise any of the powers vested in it by the
Declaration at the request of any holder of Capital Securities, unless offered
reasonable indemnity by such holder against the costs, expenses and liabilities
which might be incurred thereby. Notwithstanding the foregoing, the holders of
Capital Securities will not be required to offer such indemnity in the event
such holders, by exercising their voting rights, direct the Institutional
Trustee to take any action following a Declaration Event of Default.
 
PAYING AGENT
 
    In the event that the Capital Securities do not remain in book-entry only
form, the following provisions will apply:
 
    The Institutional Trustee will act as paying agent and may designate an
additional or substitute paying agent at any time.
 
    Registration of transfers of Capital Securities will be effected without
charge by or on behalf of Citigroup Capital, but upon payment (with the giving
of such indemnity as Citigroup Capital or the Company may require) in respect of
any tax or other government charges that may be imposed in relation to it.
 
    Citigroup Capital will not be required to register or cause to be registered
the transfer of Capital Securities after such Capital Securities have been
called for redemption.
 
GOVERNING LAW
 
    The Declaration and the Capital Securities will be governed by, and
construed in accordance with, the internal laws of the State of Delaware.
 
MISCELLANEOUS
 
    The Regular Trustees are authorized and directed to operate Citigroup
Capital in such a way so that Citigroup Capital will not be required to register
as an "investment company" under the 1940 Act or be characterized as other than
a grantor trust for United States federal income tax purposes. The Company is
authorized and directed to conduct its affairs so that the Junior Subordinated
Debt Securities will be treated as indebtedness of the Company for United States
federal income tax purposes. In this connection, the Company and the Regular
Trustees are authorized to take any action, not inconsistent with applicable
law, the certificate of trust of Citigroup Capital or the certificate of
incorporation of the Company, that each of the Company and the Regular Trustees
determine in their discretion to be necessary or desirable to achieve such end,
as long as such action does not adversely affect the interests of the holders of
the Capital Securities or vary the terms thereof.
 
    Holders of the Capital Securities have no preemptive rights.
 
                                       24

             DESCRIPTION OF THE JUNIOR SUBORDINATED DEBT SECURITIES
 
    Set forth below is a description of the specific terms of the Junior
Subordinated Debt Securities in which Citigroup Capital will invest the proceeds
from the issuance and sale of the Trust Securities. The following description
does not purport to be complete and is subject to, and is qualified in its
entirety by reference to, the Indenture, dated as of October 7, 1996 (as
supplemented, the "Indenture"), between the Company and The Chase Manhattan
Bank, as Trustee (the "Indenture Trustee"), the form of which is filed as an
exhibit to the Registration Statement of which this Prospectus forms a part; and
the Trust Indenture Act. Certain capitalized terms used herein are defined in
the Indenture. Wherever particular sections or defined terms of the Indenture
are referred to, such sections or defined terms are incorporated herein by
reference as part of the statement made, and the statement qualified in its
entirety by such reference.
 
    Under certain circumstances involving the dissolution of Citigroup Capital,
subject to obtaining any required regulatory approval, Junior Subordinated Debt
Securities will be distributed to the holders of the Trust Securities in
liquidation of Citigroup Capital. See "Description of the Capital Securities--
Special Event Redemption or Distribution."
 
    If the Junior Subordinated Debt Securities are distributed to the holders of
the Capital Securities, the Company will use its best efforts to have the Junior
Subordinated Debt Securities listed on the NYSE or on such other national
securities exchange or similar organization on which the Capital Securities are
then listed or quoted.
 
GENERAL
 
    The Junior Subordinated Debt Securities will be issued as unsecured debt
under the Indenture. The Junior Subordinated Debt Securities will be limited in
aggregate principal amount to approximately $      , such amount being the sum
of the aggregate stated liquidation amount of the Capital Securities and the
capital contributed by the Company to Citigroup Capital in exchange for the
Common Securities (the "Citigroup Payment"). (Section 3.1)
 
    The Junior Subordinated Debt Securities are not subject to a sinking fund
provision. The entire principal amount of the Junior Subordinated Debt
Securities will mature and become due and payable, together with any accrued and
unpaid interest thereon including Compound Interest (as defined herein) and
Additional Interest (as defined herein), if any, on       , 20  .
 
    If Junior Subordinated Debt Securities are distributed to holders of Capital
Securities in liquidation of such holders' interests in Citigroup Capital, such
Junior Subordinated Debt Securities will initially be issued in the form of one
or more Global Securities (as defined under "Book-Entry and Settlement" below).
As described herein, under certain limited circumstances, Junior Subordinated
Debt Securities may be issued in certificated form in exchange for a Global
Security. See "Book-Entry and Settlement" below. In the event that Junior
Subordinated Debt Securities are issued in certificated form, such Junior
Subordinated Debt Securities will be in denominations of $  and integral
multiples thereof and may be transferred or exchanged at the offices described
below. Payments on Junior Subordinated Debt Securities issued as a Global
Security will be made to DTC, to a successor depositary or, in the event that no
depositary is used, to a Paying Agent for the Junior Subordinated Debt
Securities. In the event Junior Subordinated Debt Securities are issued in
certificated form, principal and interest will be payable, the transfer of the
Junior Subordinated Debt Securities will be registrable and Junior Subordinated
Debt Securities will be exchangeable for Junior Subordinated Debt Securities of
other denominations of a like aggregate principal amount at the corporate trust
office of the Indenture Trustee in New York, New York; PROVIDED, that payment of
interest may be made at the option of the Company by check mailed to the address
of the persons entitled thereto.
 
                                       25

    The Company does not intend to issue and sell the Junior Subordinated Debt
Securities to any purchasers other than Citigroup Capital.
 
    There are no covenants or provisions in the Indenture that would afford the
holders of the Junior Subordinated Debt Securities protection in the event of a
highly leveraged transaction, reorganization, restructuring, merger or similar
transaction involving the Company that may adversely affect such holders.
 
CONSOLIDATION, MERGER AND SALE OF ASSETS
 
    The Indenture provides that the Company will not consolidate with or merge
into any other corporation or convey, transfer or lease its assets substantially
as an entirety unless (a) the successor is a corporation organized in the United
States and expressly assumes the due and punctual payment of the principal of
(and premium, if any) and interest on all Junior Subordinated Debt Securities
issued thereunder and the performance of every other covenant of the Indenture
on the part of the Company and (b) immediately thereafter no Event of Default
and no event which, after notice or lapse of time, or both, would become an
Event of Default, shall have happened and be continuing. Upon any such
consolidation, merger, conveyance or transfer, the successor corporation shall
succeed to and be substituted for the Company under the Indenture and thereafter
the predecessor corporation shall be relieved of all obligations and covenants
under the Indenture and the Junior Subordinated Debt Securities. (Sections 8.1
and 8.2)
 
SUBORDINATION
 
    The Indenture provides that the Junior Subordinated Debt Securities are
subordinated and junior in right of payment to all Senior Indebtedness (as
defined below) of the Company. This means that no payment of principal
(including redemption payments), premium, if any, or interest on the Junior
Subordinated Debt Securities may be made if (i) any Senior Indebtedness of the
Company has not been paid when due and any applicable grace period with respect
to such default has ended and such default has not been cured or waived or
ceased to exist, or (ii) the maturity of any Senior Indebtedness of the Company
has been accelerated because of a default. Upon any distribution of assets of
the Company to creditors upon any dissolution, winding-up, liquidation or
reorganization, whether voluntary or involuntary, or in bankruptcy, insolvency,
receivership or other proceedings, all principal, premium, if any, and interest
due or to become due on all Senior Indebtedness of the Company must be paid in
full before the holders of Junior Subordinated Debt Securities are entitled to
receive or retain any payment. Upon satisfaction of all claims related to all
Senior Indebtedness of the Company then outstanding, the rights of the holders
of the Junior Subordinated Debt Securities will be subrogated to the rights of
the holders of Senior Indebtedness of the Company to receive payments or
distributions applicable to Senior Indebtedness until all amounts owing on the
Junior Subordinated Debt Securities are paid in full.
 
    The term "Senior Indebtedness" means, with respect to the Company, (i) the
principal, premium, if any, and interest in respect of (A) indebtedness of such
obligor for money borrowed and (B) indebtedness evidenced by securities, notes,
debentures, bonds or other similar instruments issued by such obligor, (ii) all
capital lease obligations of such obligor, (iii) all obligations of such obligor
issued or assumed as the deferred purchase price of property, all conditional
sale obligations of such obligor and all obligations of such obligor under any
conditional sale or title retention agreement (but excluding trade accounts
payable arising in the ordinary course of business), (iv) all obligations,
contingent or otherwise, of such obligor in respect of any letters of credit,
banker's acceptance, security purchase facilities or similar credit
transactions, (v) all obligations in respect of interest rate swap, cap or other
agreements, interest rate future or option contracts, currency swap agreements,
currency future or option contracts and other similar agreements, (vi) all
obligations of the type referred to in clauses (i) through (v) above of other
persons for the payment of which such obligor is responsible or
 
                                       26

liable as obligor, guarantor or otherwise and (vii) all obligations of the type
referred to in clauses (i) through (vi) above of other persons secured by any
lien on any property or asset of such obligor (whether or not such obligation is
assumed by such obligor), except for (1) any such indebtedness that is by its
terms subordinated to or PARI PASSU with the Junior Subordinated Debt Securities
and (2) any indebtedness between or among such obligor or its affiliates,
including all other debt securities and guarantees in respect of those debt
securities, issued to (a) any other Citigroup Trust or a trustee of such trust
and (b) any other trust, or a trustee of such trust, partnership or other entity
affiliated with the Company that is a financing vehicle of the Company (a
"financing entity") in connection with the issuance by such financing entity of
preferred securities or other securities guaranteed by the Company pursuant to
an instrument that ranks PARI PASSU with, or junior to, the Guarantee. Such
Senior Indebtedness shall continue to be Senior Indebtedness and be entitled to
the benefits of the subordination provisions irrespective of any amendment,
modification or waiver of any term of such Senior Indebtedness.
 
    The Indenture does not limit the aggregate amount of Senior Indebtedness
that may be issued by the Company.
 
OPTIONAL REDEMPTION
 
    Subject to obtaining any required regulatory approval, the Company shall
have the right to redeem the Junior Subordinated Debt Securities, in whole or in
part, from time to time, on or after             , or at any time in certain
circumstances upon the occurrence of a Tax Event, an Investment Company Event or
a Regulatory Capital Event, as described under "Description of the Capital
Securities--Special Event Redemption," upon not less than 30 nor more than 60
days' notice, at a redemption price equal to 100% of the principal amount to be
redeemed plus any accrued and unpaid interest, including Additional Interest (as
defined herein), if any, to the redemption date. If a partial redemption of the
Capital Securities resulting from a partial redemption of the Junior
Subordinated Debt Securities would result in the delisting of the Capital
Securities, the Company may only redeem the Junior Subordinated Debt Securities
in whole. (Section 11.2)
 
INTEREST
 
    Each Junior Subordinated Debt Security shall bear interest at the annual
rate of   %, from and including the original date of issuance, payable       in
arrears on             of each year (each an "Interest Payment Date"),
commencing             to the person in whose name such Junior Subordinated Debt
Security is registered, subject to certain exceptions, at the close of business
on the Business Day next preceding such Interest Payment Date. In the event the
Junior Subordinated Debt Securities shall not continue to remain in book-entry
only form, the Company shall have the right to select record dates, which shall
be more than 14 days but less than 60 days prior to the Interest Payment Date.
 
    The amount of interest payable for any period will be computed on the basis
of a 360-day year of twelve 30-day months. The amount of interest payable for
any period shorter than a full       period for which interest is computed will
be computed on the basis of the actual number of days elapsed per 30-day month.
In the event that any date on which interest is payable on the Junior
Subordinated Debt Securities is not a Business Day, then payment of the interest
payable on such date will be made on the next succeeding day that is a Business
Day (and without any interest or other payment in respect of any such delay),
except that, if such Business Day is in the next succeeding calendar year, then
such payment shall be made on the immediately preceding Business Day, in each
case with the same force and effect as if made on such date.
 
                                       27

OPTION TO EXTEND INTEREST PAYMENT PERIOD
 
    The Company can defer interest payments by extending the interest payment
period for a period not exceeding       consecutive periods, PROVIDED, that no
Extension Period may extend beyond the maturity of the Junior Subordinated Debt
Securities, at the end of which Extension Period, the Company shall pay all
interest then accrued and unpaid (including any Additional Interest) together
with interest thereon compounded       at the rate specified for the Junior
Subordinated Debt Securities to the extent permitted by applicable law
("Compound Interest"); PROVIDED FURTHER, that during any such Extension Period,
(a) the Company shall not declare or pay any dividend on, make any distributions
with respect to, or redeem, purchase, acquire or make a liquidation payment with
respect to, any of its capital stock or make any guarantee payment with respect
thereto (other than (i) repurchases, redemptions or other acquisitions of shares
of capital stock of the Company in connection with any employment contract,
benefit plan or other similar arrangement with or for the benefit of employees,
officers, directors or consultants, (ii) as a result of an exchange or
conversion of any class or series of the Company's capital stock for any other
class or series of the Company's capital stock, or (iii) the purchase of
fractional interests in shares of the Company's capital stock pursuant to the
conversion or exchange provisions of such capital stock or the security being
converted or exchanged), and (b) the Company shall not make any payment of
interest on or principal of (or premium, if any, on), or repay, repurchase or
redeem, any debt securities issued by the Company which rank PARI PASSU with or
junior to the Junior Subordinated Debt Securities. The foregoing, however, will
not apply to any stock dividends paid by the Company where the dividend stock is
the same stock as that on which the dividend is being paid. Prior to the
termination of any Extension Period, the Company may further defer payments of
interest by extending such Extension Period; PROVIDED, HOWEVER, that such
Extension Period, including all such previous and further extensions, may not
exceed   consecutive       interest periods (including the       interest period
in which notice of such Extension Period (as described below) is given);
PROVIDED FURTHER, that no Extension Period may extend beyond the maturity of the
Junior Subordinated Debt Securities. Upon the termination of any Extension
Period and the payment of all amounts then due, the Company may commence a new
Extension Period, subject to the terms set forth in this section. No interest
during an Extension Period, except at the end thereof, shall be due and payable.
The Company has no present intention of exercising its right to defer payments
of interest by extending the interest payment period on the Junior Subordinated
Debt Securities. If the Institutional Trustee shall be the sole holder of the
Junior Subordinated Debt Securities, the Company shall give the Regular Trustees
and the Institutional Trustee notice of its selection of such Extension Period
one Business Day prior to the earlier of (i) the date distributions on the
Capital Securities would be payable, if not for such Extension Period, or (ii)
the date the Regular Trustees are required to give notice to the New York Stock
Exchange (or other applicable self-regulatory organization) or to holders of the
Capital Securities of the record date or the date such distribution would be
payable, if not for such Extension Period, but in any event one Business Day
prior to such record date. The Regular Trustees shall give notice of the
Company's selection of such Extension Period to the holders of the Capital
Securities. If the Institutional Trustee shall not be the sole holder of the
Junior Subordinated Debt Securities, the Company shall give the holders of the
Junior Subordinated Debt Securities notice of its selection of such Extension
Period ten Business Days prior to the earlier of (i) the next succeeding
Interest Payment Date or (ii) the date upon which the Company is required to
give notice to the New York Stock Exchange (or other applicable self-regulatory
organization) or to holders of the Junior Subordinated Debt Securities of the
record or payment date of such related interest payment. (Sections 13.1 and
13.2)
 
ADDITIONAL INTEREST
 
    If at any time Citigroup Capital is required to pay any taxes, duties,
assessments or governmental charges of whatever nature (other than withholding
taxes) imposed by the United States, or any other taxing authority, then the
Company will be required to pay additional interest ("Additional Interest")
 
                                       28

on the Junior Subordinated Debt Securities. The amount of any Additional
Interest will be an amount sufficient so that the net amounts received and
retained by Citigroup Capital after paying any such taxes, duties, assessments
or other governmental charges will be not less than the amounts Citigroup
Capital would have received had no such taxes, duties, assessments or other
governmental charges been imposed.
 
INDENTURE EVENTS OF DEFAULT
 
    The Indenture provides that the following are Events of Default with respect
to the Junior Subordinated Debt Securities: (a) default in the payment of the
principal of (or premium, if any, on) any Junior Subordinated Debt Security at
its maturity; (b) default for 30 days in the payment of any installment of
interest on any Junior Subordinated Debt Security; (c) default for 90 days after
written notice in the performance of any other covenant in respect of the Junior
Subordinated Debt Securities; (d) certain events of bankruptcy, insolvency or
reorganization, or court appointment of a receiver, liquidator or trustee of the
Company; and (e) any other Event of Default provided in the applicable
resolution of the Board of Directors or supplemental indenture under which the
Junior Subordinated Debt Securities are issued. The Indenture Trustee may
withhold notice to the holders of the Junior Subordinated Debt Securities of any
default with respect thereto (except in the payment of principal, premium or
interest) if it considers such withholding to be in the interests of such
holders. (Section 5.1)
 
    If any Indenture Event of Default shall occur and be continuing, the
Institutional Trustee, as the holder of the Junior Subordinated Debt Securities,
will have the right to declare the principal of and the interest on the Junior
Subordinated Debt Securities (including any Compound Interest and Additional
Interest, if any) and any other amounts payable under the Indenture to be
forthwith due and payable and to enforce its other rights as a creditor with
respect to the Junior Subordinated Debt Securities. (Section 5.2) An Indenture
Event of Default also constitutes a Declaration Event of Default. The holders of
Capital Securities in certain circumstances have the right to direct the
Institutional Trustee to exercise its rights as the holder of the Junior
Subordinated Debt Securities. See "Description of the Capital
Securities--Declaration Events of Default" and "--Voting Rights."
 
    Notwithstanding the foregoing, if a Declaration Event of Default has
occurred and is continuing and such event is attributable to the failure of the
Company to pay interest or principal on the Junior Subordinated Debt Securities
on the date such interest or principal is otherwise payable, the Company
acknowledges that, in such event, a holder of Capital Securities may institute a
Direct Action for payment on or after the respective due date specified in the
Junior Subordinated Debt Securities. The Company may not amend the Indenture to
remove the foregoing right to bring a Direct Action without the prior written
consent of all of the holders of Capital Securities of Citigroup Capital.
Notwithstanding any payment made to such holder of Capital Securities by the
Company in connection with a Direct Action, the Company shall remain obligated
to pay the principal of or interest on the Junior Subordinated Debt Securities
held by Citigroup Capital or the Institutional Trustee of Citigroup Capital, and
the Company shall be subrogated to the rights of the holder of such Capital
Securities with respect to payments on the Capital Securities to the extent of
any payments made by the Company to such holder in any Direct Action. The
holders of Capital Securities will not be able to exercise directly any other
remedy available to the holders of the Junior Subordinated Debt Securities.
(Sections 5.7 and 5.8)
 
MODIFICATIONS AND AMENDMENTS
 
    Modifications and amendments to the Indenture may be made by the Company and
the Indenture Trustee with the consent of the Holders of a majority in principal
amount of the Junior Subordinated Debt Securities at the time outstanding,
PROVIDED, that no such modification or amendment may, without the consent of the
Holder of each Junior Subordinated Debt Security affected thereby: (i) modify
the terms of payment of principal, premium, if any, or interest on; or (ii)
reduce the percentage of
 
                                       29

Holders of Junior Subordinated Debt Securities necessary to modify or amend the
Indenture or waive compliance by the Company with any covenant or past default,
PROVIDED, FURTHER, that if the Junior Subordinated Debt Securities are held by
Citigroup Capital or a trustee of Citigroup Capital, such supplemental indenture
shall not be effective until the holders of a majority in liquidation preference
of Trust Securities of Citigroup Capital shall have consented to such
supplemental indenture; PROVIDED FURTHER, that if the consent of the Holder of
each outstanding Junior Subordinated Debt Security is required, such
supplemental indenture shall not be effective until each holder of the Trust
Securities of Citigroup Capital shall have consented to such supplemental
indenture. (Section 9.2)
 
DISCHARGE AND DEFEASANCE
 
    The Company may discharge all of its obligations (except those set forth
below) to holders of the Junior Subordinated Debt Securities issued under the
Indenture, which Junior Subordinated Debt Securities have not already been
delivered to the Indenture Trustee for cancellation and which either have become
due and payable or are by their terms due and payable within one year (or are to
be called for redemption within one year) by depositing with the Indenture
Trustee an amount certified to be sufficient to pay when due the principal of
and premium, if any, and interest on all outstanding Junior Subordinated Debt
Securities and to make any mandatory sinking fund payments thereon when due.
(Section 4.1)
 
    Unless otherwise specified herein with respect to the Junior Subordinated
Debt Securities, the Company, at its option, (i) will be discharged from any and
all obligations in respect of the Junior Subordinated Debt Securities (except
for certain obligations to pay all expenses of Citigroup Capital, to register
the transfer or exchange of Junior Subordinated Debt Securities, to replace
mutilated, defaced, destroyed, lost or stolen Junior Subordinated Debt
Securities, and to maintain Paying Agents and hold monies for payment in trust),
or (ii) need not comply with certain covenants specified herein with respect to
the Junior Subordinated Debt Securities, and the occurrence of an event
described in clause (c) under "Events of Default" above with respect to any
defeased covenant and any other Event of Default provided in the applicable
resolution of the Board of Directors or supplemental indenture under which the
Junior Subordinated Debt Securities are issued shall no longer be an Event of
Default if, in either case, the Company deposits with the Indenture Trustee, in
trust, money or U.S. Government Obligations that through the payment of interest
thereon and principal thereof in accordance with their terms will provide money
in an amount sufficient to pay all the principal of (and premium, if any) and
any interest on the Junior Subordinated Debt Securities on the dates such
payments are due (which may include one or more redemption dates designated by
the Company) in accordance with the terms of the Junior Subordinated Debt
Securities. Such a trust may only be established, if, among other things, the
Company shall have delivered an Opinion of Counsel, which, in the case of a
discharge pursuant to clause (i), must be based upon a ruling or administrative
pronouncement of the Internal Revenue Service, to the effect that the Holders of
the Junior Subordinated Debt Securities will not recognize gain or loss for
federal income tax purposes as a result of such deposit or defeasance and will
be subject to federal income tax in the same manner as if such defeasance had
not occurred. (Sections 4.2, 4.3 and 4.4) In the event the Company omits to
comply with its remaining obligations under the Indenture after a defeasance of
the Indenture with respect to the Junior Subordinated Debt Securities as
described under clause (ii) above and the Junior Subordinated Debt Securities
are declared due and payable because of the occurrence of any undefeased Event
of Default, the amount of money and U.S. Government Obligations on deposit with
the Indenture Trustee may be insufficient to pay amounts due on the Junior
Subordinated Debt Securities at the time of the acceleration resulting from such
Event of Default. However, the Company will remain liable in respect of such
payments.
 
                                       30

CONCERNING THE INDENTURE TRUSTEE
 
    The Indenture Trustee has extended substantial credit facilities (the
borrowings under which constitute Senior Indebtedness) to the Company. The
Company and certain of its subsidiaries also maintain bank accounts, borrow
money and have other customary commercial banking or investment banking
relationships with the Indenture Trustee in the ordinary course of business.
 
BOOK-ENTRY AND SETTLEMENT
 
    If distributed to holders of Capital Securities in connection with the
involuntary or voluntary dissolution, winding-up or liquidation of Citigroup
Capital as a result of the occurrence of a Special Event, the Junior
Subordinated Debt Securities will be issued in the form of one or more global
certificates (each a "Global Security") registered in the name of the depositary
or its nominee. Except under the limited circumstances described below, Junior
Subordinated Debt Securities represented by a Global Security will not be
exchangeable for, and will not otherwise be issuable as, Junior Subordinated
Debt Securities in definitive form. The Global Securities described above may
not be transferred except by the depositary to a nominee of the depositary or by
a nominee of the depositary to the depositary or another nominee of the
depositary or to a successor depositary or its nominee.
 
    The laws of some jurisdictions require that certain purchasers of securities
take physical delivery of such securities in definitive form. Such laws may
impair the ability to transfer beneficial interests in such a Global Security.
 
    Except as provided below, owners of beneficial interests in such a Global
Security will not be entitled to receive physical delivery of Junior
Subordinated Debt Securities in definitive form and will not be considered the
Holders (as defined in the Indenture) thereof for any purpose under the
Indenture, and no Global Security representing Junior Subordinated Debt
Securities shall be exchangeable, except for another Global Security of like
denomination and tenor to be registered in the name of the depositary or its
nominee or to a successor depositary or its nominee. Accordingly, each
Beneficial Owner must rely on the procedures of the depositary or if such person
is not a Participant, on the procedures of the Participant through which such
person owns its interest to exercise any rights of a holder under the Indenture.
 
THE DEPOSITARY
 
    If Junior Subordinated Debt Securities are distributed to holders of Capital
Securities in liquidation of such holders' interests in Citigroup Capital, DTC
will act as securities depositary for the Junior Subordinated Debt Securities.
For a description of DTC and the specific terms of the depositary arrangements,
see "Description of the Capital Securities--Book-Entry Only Issuance--The
Depository Trust Company." As of the date of this Prospectus, the description
therein of DTC's book-entry system and DTC's practices as they relate to
purchases, transfers, notices and payments with respect to the Capital
Securities apply in all material respects to any debt obligations represented by
one or more Global Securities held by DTC. The Company may appoint a successor
to DTC or any successor depositary in the event DTC or such successor depositary
is unable or unwilling to continue as a depositary for the Global Securities.
 
    None of the Company, Citigroup Capital, the Indenture Trustee, any paying
agent and any other agent of the Company or the Indenture Trustee will have any
responsibility or liability for any aspect of the records relating to or
payments made on account of beneficial ownership interests in a Global Security
for such Junior Subordinated Debt Securities or for maintaining, supervising or
reviewing any records relating to such beneficial ownership interests.
 
                                       31

DISCONTINUANCE OF THE DEPOSITARY'S SERVICES
 
    A Global Security shall be exchangeable for Junior Subordinated Debt
Securities registered in the names of persons other than the depositary or its
nominee only if (i) the depositary notifies the Company that it is unwilling or
unable to continue as a depositary for such Global Security and no successor
depositary shall have been appointed, (ii) the depositary, at any time, ceases
to be a clearing agency registered under the Exchange Act at which time the
depositary is required to be so registered to act as such depositary and no
successor depositary shall have been appointed, (iii) the Company, in its sole
discretion, determines that such Global Security shall be so exchangeable or
(iv) there shall have occurred an Indenture Event of Default with respect to
such Junior Subordinated Debt Securities. Any Global Security that is
exchangeable pursuant to the preceding sentence shall be exchangeable for Junior
Subordinated Debt Securities registered in such names as the depositary shall
direct. It is expected that such instructions will be based upon directions
received by the depositary from its Participants with respect to ownership of
beneficial interests in such Global Security.
 
CERTAIN COVENANTS
 
    If the Junior Subordinated Debt Securities are issued to Citigroup Capital
or a trustee of such trust in connection with the issuance of Trust Securities
by Citigroup Capital and (i) there shall have occurred and be continuing an
Event of Default, (ii) the Company shall be in default with respect to its
payment of any obligations under the Guarantee, or (iii) the Company shall have
given notice of its election to defer payments of interest on the Junior
Subordinated Debt Securities by extending the interest payment period as
provided in the Indenture and such period, or any extension thereof, shall be
continuing, then (a) the Company shall not declare or pay any dividend on, make
any distributions with respect to, or redeem, purchase, acquire or make a
liquidation payment with respect to, any of its capital stock or make any
guarantee payment with respect thereto (other than (i) repurchases, redemptions
or other acquisitions of shares of capital stock of the Company in connection
with any employment contract, benefit plan or other similar arrangement with or
for the benefit of employees, officers, directors or consultants, (ii) as a
result of an exchange or conversion of any class or series of the Company's
capital stock for any other class or series of the Company's capital stock, or
(iii) the purchase of fractional interests in shares of the Company's capital
stock pursuant to the conversion or exchange provisions of such capital stock or
the security being converted or exchanged), and (b) the Company shall not make
any payment of interest on or principal of (or premium, if any, on), or repay,
repurchase or redeem any debt securities issued by the Company which rank PARI
PASSU with or junior to the Junior Subordinated Debt Securities. The foregoing,
however, will not apply to any stock dividends paid by the Company where the
dividend stock is the same stock as that on which the dividend is being paid.
(Section 13.3)
 
    For so long as the Trust Securities remain outstanding, the Company will
covenant (i) to directly or indirectly maintain 100% ownership of the Common
Securities of the Trust; PROVIDED, HOWEVER, that any permitted successor of the
Company under the Indenture may succeed to the Company's ownership of such
Common Securities, (ii) to not voluntarily dissolve, wind-up or terminate the
Trust, except in connection with a distribution of Junior Subordinated Debt
Securities as described under "Distribution of the Junior Subordinated Debt
Securities" and in connection with certain mergers, consolidations or
amalgamations permitted by the Declaration, (iii) to timely perform its duties
as Sponsor of the Trust and (iv) to use its reasonable efforts to cause the
Trust (a) to remain a statutory business trust, except in connection with the
distribution of Junior Subordinated Debt Securities to the holders of Trust
Securities in liquidation of the Trust, the redemption of all of the Trust
Securities of the Trust, or certain mergers, consolidations or amalgamations,
each as permitted by the Declaration of the Trust, and (b) to otherwise continue
to be classified as a grantor trust for United States federal income tax
purposes. (Section 10.5)
 
                                       32

MISCELLANEOUS
 
    The Indenture provides that the Company will pay all fees and expenses
related to (i) the offering of the Trust Securities and the Junior Subordinated
Debt Securities, (ii) the organization, maintenance and dissolution of Citigroup
Capital, (iii) the retention of the Citigroup Trustees and (iv) the enforcement
by the Institutional Trustee of the rights of the holders of the Capital
Securities.
 
                            DESCRIPTION OF GUARANTEE
 
    Set forth below is a summary of information concerning the Guarantee that
will be executed and delivered by the Company for the benefit of the holders of
Capital Securities. The Guarantee will be qualified as an indenture under the
Trust Indenture Act. The Chase Manhattan Bank will act as indenture trustee
under the Guarantee (the "Guarantee Trustee"). The terms of the Guarantee will
be those set forth in the Guarantee and those made part of the Guarantee by the
Trust Indenture Act. The summary does not purport to be complete and is subject
in all respects to the provisions of, and is qualified in its entirety by
reference to, the form of Guarantee, which is filed as an exhibit to the
Registration Statement of which this Prospectus forms a part, and the Trust
Indenture Act. The Guarantee will be held by the Guarantee Trustee for the
benefit of the holders of the Capital Securities.
 
GENERAL
 
    Pursuant to and to the extent set forth in the Guarantee, the Company will
irrevocably and unconditionally agree to pay in full to the holders of the
Capital Securities (except to the extent paid by Citigroup Capital), as and when
due, regardless of any defense, right of set-off or counterclaim which Citigroup
Capital may have or assert, the following payments (the "Guarantee Payments"),
without duplication: (i) any accrued and unpaid distributions that are required
to be paid on the Capital Securities, to the extent Citigroup Capital has funds
available therefor, and (ii) the redemption price of $  per Capital Security,
plus all accrued and unpaid distributions (the "Redemption Price"), to the
extent Citigroup Capital has funds available therefor, with respect to any
Capital Securities called for redemption by Citigroup Capital, and (iii) upon a
voluntary or involuntary dissolution, winding-up or termination of Citigroup
Capital (other than in connection with the distribution of Junior Subordinated
Debt Securities to the holders of Capital Securities or the redemption of all of
the Capital Securities) the lesser of (a) the aggregate of the liquidation
amount and all accrued and unpaid distributions on the Capital Securities to the
date of payment or (b) the amount of assets of Citigroup Capital remaining for
distribution to holders of the Capital Securities in liquidation of Citigroup
Capital. The Company's obligation to make a Guarantee Payment may be satisfied
by direct payment of the required amounts by the Company to the holders of
Capital Securities or by causing Citigroup Capital to pay such amounts to such
holders.
 
    The Guarantee will be a guarantee on a subordinated basis with respect to
the Capital Securities from the time of issuance of the Capital Securities but
will not apply to any payment of distributions or Redemption Price, or to
payments upon the dissolution, winding-up or termination of Citigroup Capital,
except to the extent Citigroup Capital shall have funds available therefor. If
the Company does not make interest payments on the Junior Subordinated Debt
Securities, Citigroup Capital will not pay distributions on the Capital
Securities and will not have funds available therefor. See "Description of
Junior Subordinated Debt Securities." The Guarantee, when taken together with
the Company's obligations under the Junior Subordinated Debt Securities, the
Indenture and the Declaration, including its obligations to pay costs, expenses,
debts and liabilities of Citigroup Capital (other than with respect to Trust
Securities), will provide a full and unconditional guarantee on a subordinated
basis by the Company of payments due on the Capital Securities.
 
                                       33

CERTAIN COVENANTS OF THE COMPANY
 
    In the Guarantee, the Company will covenant that, so long as any Capital
Securities remain outstanding, if there shall have occurred any event that would
constitute an Event of Default under such Guarantee or the Declaration, then (a)
the Company shall not declare or pay any dividend on, make any distributions
with respect to, or redeem, purchase, acquire or make a liquidation payment with
respect to, any of its capital stock or make any guarantee payment with respect
thereto (other than (i) repurchases, redemptions or other acquisitions of shares
of capital stock of the Company in connection with any employment contract,
benefit plan or other similar arrangement with or for the benefit of employees,
officers, directors or consultants, (ii) as a result of an exchange or
conversion of any class or series of the Company's capital stock for any other
class or series of the Company's capital stock, or (iii) the purchase of
fractional interests in shares of the Company's capital stock pursuant to the
conversion or exchange provisions of such capital stock or the security being
converted or exchanged) and (b) the Company shall not make any payment of
interest on, or principal of (or premium, if any, on), or repay, repurchase or
redeem, any debt securities issued by the Company which rank PARI PASSU with or
junior to the Junior Subordinated Debt Securities. The Guarantee, however, will
except from the foregoing any stock dividends paid by the Company where the
dividend stock is the same stock as that on which the dividend is being paid.
 
MODIFICATION OF GUARANTEE; ASSIGNMENT
 
    Except with respect to any changes that do not adversely affect the rights
of holders of Capital Securities (in which case no vote will be required), the
Guarantee may be amended only with the prior approval of the holders of not less
than a majority in aggregate liquidation amount of the outstanding Capital
Securities. All guarantees and agreements contained in the Guarantee shall bind
the successors, assignees, receivers, trustees and representatives of the
Company and shall inure to the benefit of the holders of the Capital Securities
then outstanding.
 
EVENTS OF DEFAULT
 
    An Event of Default under the Guarantee will occur upon the failure of the
Company to perform any of its payment or other obligations thereunder. The
holders of a majority in aggregate liquidation amount of the Capital Securities
have the right to direct the time, method and place of conducting any proceeding
for any remedy available to the Guarantee Trustee in respect of the Guarantee or
to direct the exercise of any trust or power conferred upon the Guarantee
Trustee under the Guarantee. If the Guarantee Trustee fails to enforce the
Guarantee Trustee's rights under the Guarantee, any holder of related Capital
Securities may directly institute a legal proceeding against the Company to
enforce the Guarantee Trustee's rights under the Guarantee without first
instituting a legal proceeding against Citigroup Capital, the Guarantee Trustee
or any other person or entity. A holder of Capital Securities may also directly
institute a legal proceeding against the Company to enforce such holder's right
to receive payment under the Guarantee without first (i) directing the Guarantee
Trustee to enforce the terms of the Guarantee or (ii) instituting a legal
proceeding against Citigroup Capital or any other person or entity.
 
    The Company will be required to provide annually to the Guarantee Trustee a
statement as to the performance by the Company of certain of its obligations
under the Guarantee and as to any default in such performance.
 
INFORMATION CONCERNING THE GUARANTEE TRUSTEE
 
    The Guarantee Trustee, prior to the occurrence of a default with respect to
the Guarantee, undertakes to perform only such duties as are specifically set
forth in the Guarantee and, after default with respect to the Guarantee, shall
exercise the same degree of care as a prudent individual would exercise
 
                                       34

in the conduct of his or her own affairs. Subject to such provision, the
Guarantee Trustee is under no obligation to exercise any of the powers vested in
it by the Guarantee at the request of any holder of Capital Securities unless it
is offered reasonable indemnity against the costs, expenses and liabilities that
might be incurred thereby.
 
TERMINATION OF THE GUARANTEE
 
    The Guarantee will terminate as to the Capital Securities upon full payment
of the Redemption Price of all Capital Securities, upon distribution of the
Junior Subordinated Debt Securities to the holders of the Capital Securities or
upon full payment of the amounts payable in accordance with the Declaration upon
liquidation of Citigroup Capital. The Guarantee will continue to be effective or
will be reinstated, as the case may be, if at any time any holder of Capital
Securities must restore payment of any sums paid under the Capital Securities or
the Guarantee.
 
STATUS OF THE GUARANTEE
 
    The Guarantee will constitute an unsecured obligation of the Company and
will rank (i) subordinate and junior in right of payment to all other
liabilities of the Company, (ii) PARI PASSU with the most senior preferred or
preference stock now or hereafter issued by the Company and with any guarantee
now or hereafter entered into by the Company in respect of any preferred or
preference stock of any subsidiary of the Company and (iii) senior to the
Company's common stock. The terms of the Capital Securities provide that each
holder of Capital Securities by acceptance thereof agrees to the subordination
provisions and other terms of the Guarantee.
 
    The Guarantee will constitute a guarantee of payment and not of collection
(that is, the guaranteed party may institute a legal proceeding directly against
the guarantor to enforce its rights under the Guarantee without instituting a
legal proceeding against any other person or entity).
 
GOVERNING LAW
 
    The Guarantee will be governed by, and construed in accordance with, the
internal laws of the State of New York.
 
                                       35

                        EFFECT OF OBLIGATIONS UNDER THE
             JUNIOR SUBORDINATED DEBT SECURITIES AND THE GUARANTEE
 
    As set forth in the Declaration, the sole purpose of Citigroup Capital is to
issue the Trust Securities evidencing undivided beneficial interests in the
assets of Citigroup Capital, and to invest the proceeds from such issuance and
sale in the Junior Subordinated Debt Securities.
 
    As long as payments of interest and other payments are made when due on the
Junior Subordinated Debt Securities, such payments will be sufficient to cover
distributions and payments due on the Trust Securities because of the following
factors: (i) the aggregate principal amount of Junior Subordinated Debt
Securities will be equal to the sum of the aggregate stated liquidation amount
of the Trust Securities; (ii) the interest rate and the interest and other
payment dates on the Junior Subordinated Debt Securities will match the
distribution rate and distribution and other payment dates for the Capital
Securities; (iii) pursuant to the Indenture, the Company shall pay, and
Citigroup Capital shall not be obligated to pay, directly or indirectly, all
costs, expenses, debt and obligations of Citigroup Capital other than with
respect to the Trust Securities; and (iv) the Declaration further provides that
the Citigroup Trustees shall not cause or permit Citigroup Capital to, among
other things, engage in any activity that is not consistent with the purposes of
Citigroup Capital.
 
    Payments of distributions (to the extent funds therefor are available) and
other payments due on the Capital Securities (to the extent funds therefor are
available) are guaranteed by the Company as and to the extent set forth under
"Description of Guarantee" in this Prospectus. If the Company does not make
interest payments on the Junior Subordinated Debt Securities purchased by
Citigroup Capital, it is expected that Citigroup Capital will not have
sufficient funds to pay distributions on the Capital Securities. The Guarantee
is a guarantee on a subordinated basis with respect to the Capital Securities
from the time of its issuance but does not apply to any payment of distributions
unless and until Citigroup Capital has sufficient funds for the payment of such
distributions.
 
    The Guarantee covers the payment of distributions and other payments on the
Capital Securities only if and to the extent that the Company has made a payment
of interest or principal or other payments on the Junior Subordinated Debt
Securities held by Citigroup Capital as its sole asset. The Guarantee, when
taken together with the Company's obligations under the Junior Subordinated Debt
Securities and the Indenture and its obligations under the Declaration,
including its obligations to pay costs, expenses, debts and liabilities of
Citigroup Capital (other than with respect to the Trust Securities), will
provide a full and unconditional guarantee of distributions, redemption payments
and liquidation payments on the Capital Securities.
 
    If the Company fails to make interest or other payments on the Junior
Subordinated Debt Securities when due (taking account of any Extension Period),
the Declaration provides a mechanism whereby the holders of the Capital
Securities, using the procedures described in "Description of the Capital
Securities--Book Entry Only Issuance--The Depository Trust Company" and
"--Voting Rights," may direct the Institutional Trustee to enforce its rights
under the Junior Subordinated Debt Securities. If the Institutional Trustee
fails to enforce its rights under the Junior Subordinated Debt Securities, any
holder of Capital Securities may directly institute a legal proceeding against
the Company to enforce the Institutional Trustee's rights under the Junior
Subordinated Debt Securities without first instituting any legal proceeding
against the Institutional Trustee or any other person or entity. If a
Declaration Event of Default has occurred and is continuing and such event is
attributable to the failure of the Company to pay interest or principal on the
Junior Subordinated Debt Securities on the date such interest or principal is
otherwise payable (or in the case of redemption, on the redemption date), then a
holder of Capital Securities may also institute a Direct Action for payment on
or after the respective due date specified in the Junior Subordinated Debt
Securities without first (i) directing the Institutional Trustee to enforce the
terms of the Junior Subordinated Debt Securities or (ii) instituting a legal
proceeding against the Company to enforce the Institutional Trustee's rights
under the Junior
 
                                       36

Subordinated Debt Securities. In connection with such Direct Action, the Company
will be subrogated to the rights of such holder of Capital Securities under the
Declaration to the extent of any payment made by the Company to such holder of
Capital Securities in such Direct Action. Consequently, the Company will be
entitled to payment of amounts that a holder of Capital Securities receives in
respect of an unpaid distribution that resulted in the bringing of a Direct
Action to the extent that such holder receives or has already received full
payment with respect to such unpaid distribution from Citigroup Capital. The
Company, under the Guarantee, acknowledges that the Guarantee Trustee shall
enforce the Guarantee on behalf of the holders of the Capital Securities. If the
Company fails to make payments under the Guarantee, the Guarantee provides a
mechanism whereby the holders of the Capital Securities may direct the Guarantee
Trustee to enforce its rights thereunder. If the Guarantee Trustee fails to
enforce the Guarantee, any holder of Capital Securities may directly institute a
legal proceeding against the Company to enforce the Guarantee Trustee's rights
under the Guarantee without first instituting a legal proceeding against
Citigroup Capital, the Guarantee Trustee, or any other person or entity. A
holder of Capital Securities may also directly institute a legal proceeding
against the Company to enforce such holder's right to receive payment under the
Guarantee without first (i) directing the Guarantee Trustee to enforce the terms
of the Guarantee or (ii) instituting a legal proceeding against Citigroup
Capital or any other person or entity.
 
    The Company and Citigroup Capital believe that the above mechanisms and
obligations, taken together, are equivalent to a full and unconditional
guarantee by the Company of payments due on the Capital Securities. See
"Description of Guarantee--General."
 
                     UNITED STATES FEDERAL INCOME TAXATION
 
GENERAL
 
    The following is a summary of the material United States federal income tax
consequences of the purchase, ownership and disposition of Capital Securities.
Unless otherwise stated, this summary deals only with Capital Securities held as
capital assets by holders who purchase the Capital Securities upon original
issuance. It does not deal with special classes of holders such as banks,
thrifts, real estate investment trusts, regulated investment companies, common
trust funds, insurance companies, dealers in securities or currencies,
tax-exempt investors, persons that have a functional currency other than the
United States Dollar or persons that will hold the Capital Securities as a
position in a "straddle," as part of a "synthetic security" or "hedge," as part
of a "conversion transaction" or other integrated investment, or as other than a
capital asset. Further, it does not include any description of any alternative
minimum tax consequences or the tax laws of any state or local government or of
any foreign government that may be applicable to the Capital Securities. This
summary is based on the Internal Revenue Code of 1986, as amended (the "Code"),
Treasury regulations thereunder and administrative and judicial interpretations
thereof, as of the date hereof, all of which are subject to change, possibly
with retroactive effect.
 
CLASSIFICATION OF THE JUNIOR SUBORDINATED DEBT SECURITIES
 
    In connection with the issuance of the Junior Subordinated Debt Securities,
Skadden, Arps, Slate, Meagher & Flom LLP ("Skadden, Arps"), tax counsel to the
Company and Citigroup Capital, will render its opinion generally to the effect
that, under then current law and assuming full compliance with the terms of the
Indenture (and certain other documents), and based on certain facts and
assumptions contained in such opinion, the Junior Subordinated Debt Securities
held by Citigroup Capital will be classified for United States federal income
tax purposes as indebtedness of the Company.
 
                                       37

CLASSIFICATION OF CITIGROUP CAPITAL
 
    In connection with the issuance of the Capital Securities, Skadden, Arps
will render its opinion generally to the effect that, under then current law and
assuming full compliance with the terms of the Declaration and the Indenture
(and certain other documents), and based on certain facts and assumptions
contained in such opinion, Citigroup Capital will be classified for United
States federal income tax purposes as a grantor trust and not as an association
taxable as a corporation. Accordingly, for United States federal income tax
purposes, each holder of Capital Securities generally will be considered the
owner of an undivided interest in the Junior Subordinated Debt Securities, and
each holder will be required to include in its gross income all interest (or
original issue discount ("OID")) and any gain recognized with respect to its
allocable share of those Junior Subordinated Debt Securities.
 
INTEREST INCOME AND ORIGINAL ISSUE DISCOUNT
 
    Under Treasury regulations applicable to debt instruments issued on or after
August 13, 1996 (the "Regulations"), a "remote" contingency that stated interest
will not be timely paid will be ignored in determining whether a debt instrument
is issued with OID. The Company believes that the likelihood of its exercising
its option to defer payments is remote within the meaning of the Regulations.
Based on the foregoing, the Company believes that, although the matter is not
free from doubt, the Junior Subordinated Debt Securities will not be considered
to be issued with OID at the time of their original issuance and, accordingly,
that a holder of the Capital Securities should include in gross income such
holder's allocable share of interest on the Junior Subordinated Debt Securities
in accordance with such holder's method of tax accounting.
 
    Under the Regulations, if the option to defer any payment of interest was
determined not to be "remote," or if the Company exercised such option, the
Junior Subordinated Debt Securities would be treated as issued with OID at the
time of issuance or at the time of such exercise, as the case may be, and all
stated interest on the Junior Subordinated Debt Securities would thereafter be
treated as OID as long as the Junior Subordinated Debt Securities remained
outstanding. In such event, all of a holder's taxable interest income with
respect to the Junior Subordinated Debt Securities would constitute OID that
would have to be included in income on an economic accrual basis before the
receipt of the cash attributable to the interest, regardless of such holder's
method of tax accounting, and actual distributions of stated interest would not
be reported as taxable income. Consequently, a holder of Capital Securities
would be required to include in gross income OID even though the Company would
not make any actual cash payments during an Extension Period.
 
    No rulings or other interpretations have been issued by the IRS which have
addressed the meaning of the term "remote" as used in the Regulations, and it is
possible that the IRS could take a position contrary to the interpretation
herein.
 
    Because income on the Capital Securities will constitute interest or OID,
corporate holders of Capital Securities will not be entitled to a
dividends-received deduction with respect to any income recognized with respect
to the Capital Securities.
 
RECEIPT OF JUNIOR SUBORDINATED DEBT SECURITIES OR CASH UPON LIQUIDATION OF
  CITIGROUP CAPITAL
 
    Under certain circumstances, as described under "Description of the Capital
Securities--Special Event Redemption or Distribution," Junior Subordinated Debt
Securities may be distributed to holders in exchange for the Capital Securities
upon the liquidation of Citigroup Capital. Under current law, such a
distribution, for United States federal income tax purposes, would be treated as
a non-taxable event to each holder, and each holder would receive an aggregate
tax basis in the Junior Subordinated Debt Securities equal to such holder's
aggregate tax basis in its Capital Securities. A holder's holding period in the
Junior Subordinated Debt Securities received in liquidation of Citigroup Capital
would include the period during which the Capital Securities were held by such
holder.
 
                                       38

    Under certain circumstances described herein (see "Description of the
Capital Securities"), the Junior Subordinated Debt Securities may be redeemed by
the Company for cash and the proceeds of such redemption distributed by
Citigroup Capital to holders in redemption of their Capital Securities. Under
current law, such a redemption would, for United States federal income tax
purposes, constitute a taxable disposition of the redeemed Capital Securities,
and a holder could recognize gain or loss as if it sold such redeemed Capital
Securities for cash. See "United States Federal Income Taxation--Sales of
Capital Securities."
 
SALES OF CAPITAL SECURITIES
 
    A holder that sells Capital Securities will be considered to have disposed
of all or part of its PRO RATA share of the Junior Subordinated Debt Securities
and will recognize gain or loss equal to the difference between its adjusted tax
basis in the Capital Securities and the amount realized on the sale of such
Capital Securities. Assuming that the Company does not exercise its option to
defer payment of interest on the Junior Subordinated Debt Securities and that
the Junior Subordinated Debt Securities are not deemed to be issued with OID, a
holder's adjusted tax basis in the Capital Securities generally will be its
initial purchase price. If the Junior Subordinated Debt Securities are deemed to
be issued with OID, a holder's tax basis in the Capital Securities generally
will be its initial purchase price, increased by OID previously includible in
such holder's gross income to the date of disposition and decreased by
distributions or other payments received on the Capital Securities since and
including the date that the Junior Subordinated Debt Securities were deemed to
be issued with OID. Such gain or loss generally will be a capital gain or loss
(except to the extent of any accrued interest with respect to such holder's PRO
RATA share of the Junior Subordinated Debt Securities required to be included in
income) and generally will be a long-term capital gain or loss if the Capital
Securities have been held for more than one year.
 
    Should the Company exercise its option to defer any payment of interest on
the Junior Subordinated Debt Securities, the Capital Securities may trade at a
price that does not accurately reflect the value of accrued but unpaid interest
with respect to the underlying Junior Subordinated Debt Securities. In the event
of such a deferral, a holder who disposes of its Capital Securities between
record dates for payments of distributions thereon will be required to include
in income as ordinary income accrued but unpaid interest on the Junior
Subordinated Debt Securities to the date of disposition and to add such amount
to its adjusted tax basis in its PRO RATA share of the underlying Junior
Subordinated Debt Securities deemed disposed of. To the extent the selling price
is less than the holder's adjusted tax basis, such holder will recognize a
capital loss. Subject to certain limited exceptions, capital losses cannot be
applied to offset ordinary income for United States federal income tax purposes.
 
NON-UNITED STATES HOLDERS
 
    For purposes of this discussion, a "Non-United States Holder" is any person
other than (i) a citizen or a resident of the United States; (ii) a corporation,
partnership, or other entity created or organized in or under the laws of the
United States or any political subdivision thereof; (iii) an estate the income
of which is subject to United States federal income tax regardless of its
source; or (iv) a trust if (A) a U.S. court is able to exercise primary
supervision over the trust's administration and (B) one or more United States
persons have the authority to control all of the trust's substantial decisions.
The term "United States" means the United States of America (including the
States and the District of Columbia).
 
    Under present United States federal income tax law: (i) payments by
Citigroup Capital or any of its paying agents to any holder of a Capital
Security who or which is a Non-United States Holder will not be subject to
United States federal withholding tax; PROVIDED, that, (a) the beneficial owner
of the Capital Security does not actually or constructively own 10% or more of
the total combined voting power of all classes of stock of the Company entitled
to vote, (b) the beneficial owner of the Capital
 
                                       39

Security is not a controlled foreign corporation that is related to the Company
through stock ownership, and (c) either (A) the beneficial owner of the Capital
Security certifies to Citigroup Capital or its agent, under penalties of
perjury, that it is not a United States holder and provides its name and address
or (B) a securities clearing organization, bank or other financial institution
that holds customers' securities in the ordinary course of its trade or business
(a "Financial Institution"), and holds the Capital Security in such capacity,
certifies to Citigroup Capital or its agent, under penalties of perjury, that
such statement has been received from the beneficial owner by it or by a
Financial Institution holding such security for the beneficial owner and
furnishes Citigroup Capital or its agent with a copy thereof; and (ii) a
Non-United States Holder of a Capital Security will not be subject to United
States federal withholding tax on any gain realized upon the sale or other
disposition of a Capital Security.
 
INFORMATION REPORTING TO HOLDERS
 
    Generally, income on the Capital Securities will be reported to holders on
Forms 1099, which forms should be mailed to holders of Capital Securities by
January 31 following each calendar year.
 
BACKUP WITHHOLDING
 
    Payments made on, and proceeds from the sale of, the Capital Securities may
be subject to a "backup" withholding tax of 31% unless the holder complies with
certain identification requirements. Any withheld amounts will be allowed as a
credit against the holder's United States federal income tax, provided the
required information is provided to the IRS on a timely basis.
 
    The United States Treasury Department recently issued final regulations
governing information reporting and the certification procedures regarding
withholding and backup withholding on certain amounts paid to Non-United States
Holders after December 31, 1999. The new Treasury regulations would alter the
procedures for claiming the benefits of an income tax treaty and may change the
certification procedures relating to the receipt by intermediaries of payments
on behalf of a beneficial owner of a Junior Subordinated Debt Security. Holders
of Capital Securities should consult their tax advisors concerning the effect,
if any, of such new Treasury regulations on an investment in the Capital
Securities.
 
    THE UNITED STATES FEDERAL INCOME TAX DISCUSSION SET FORTH ABOVE IS INCLUDED
FOR GENERAL INFORMATION ONLY AND MAY NOT BE APPLICABLE DEPENDING UPON A HOLDER'S
PARTICULAR SITUATION. HOLDERS SHOULD CONSULT THEIR TAX ADVISORS WITH RESPECT TO
THE TAX CONSEQUENCES TO THEM OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF THE
CAPITAL SECURITIES, INCLUDING THE TAX CONSEQUENCES UNDER STATE, LOCAL, FOREIGN
AND OTHER TAX LAWS AND THE POSSIBLE EFFECTS OF CHANGES IN UNITED STATES FEDERAL
OR OTHER TAX LAWS.
 
                                       40

                              ERISA CONSIDERATIONS
 
    A fiduciary of a pension, profit-sharing or other employee benefit plan
subject to the Employee Retirement Income Security Act of 1974, as amended
("ERISA"), (an "ERISA Plan") should consider the fiduciary standards of ERISA in
the context of the ERISA Plan's particular circumstances before authorizing an
investment in the Capital Securities of the Trust. Among other factors, the
fiduciary should consider whether such an investment is in accordance with the
documents governing the ERISA Plan and whether the investment is appropriate for
the ERISA Plan in view of its overall investment policy and diversification of
its portfolio.
 
    Certain provisions of ERISA and the Code prohibit ERISA Plans, as well as
individual retirement accounts and Keogh plans subject to section 4975 of the
Code (collectively, "Plans"), from engaging in certain transactions involving
"plan assets" with parties that are "parties in interest" under ERISA or
"disqualified persons" under the Code with respect to the Plan. The U.S.
Department of Labor has issued a final regulation (the "Regulation") with regard
to whether the underlying assets of an entity in which employee benefit plans
acquire equity interests are deemed to be plan assets.
 
    Under such Regulation, for purposes of ERISA and section 4975 of the Code,
the assets of the Trust would be deemed to be "plan assets" of a Plan whose
assets were used to purchase Capital Securities of the Trust if the Capital
Securities of the Trust were considered to be equity interests in the Trust and
no exception to plan asset status were applicable under the Regulation.
 
    If the assets of the Trust were deemed to be plan assets of Plans that are
holders of the Capital Securities of the Trust, a Plan's investment in the
Capital Securities of the Trust might be deemed to constitute a delegation under
ERISA of the duty to manage plan assets by a fiduciary investing in Capital
Securities of the Trust. Also, the Company might be considered a "party in
interest" or "disqualified person" with respect to Plans whose assets were used
to purchase Capital Securities of the Trust. If this were the case, an
investment in Capital Securities of the Trust by a Plan might constitute, or in
the course of the operation of the Trust give rise to, a prohibited transaction
under ERISA or the Code. In particular, it is likely that under such
circumstances a prohibited extension of credit to the Company would be
considered to occur under ERISA and the Code.
 
    In addition, the Company might be considered a "party in interest" or
"disqualified person" with respect to certain Plans for reasons unrelated to the
operation of the Trust, E.G., because of the provision of services by the
Company or an affiliate to the Plan. A purchase of Capital Securities of the
Trust by any such Plan would be likely to result in a prohibited extension of
credit to the Company, without regard to whether the assets of the Trust
constituted plan assets.
 
    Because of the possibility that a prohibited extension of credit could occur
as a result of the purchase or holding of the Capital Securities of the Trust by
a Plan, the Capital Securities of the Trust may be not purchased or held by any
Plan or any person investing "plan assets" of any Plan, unless such purchaser or
holder is eligible for the exemptive relief available under Prohibited
Transaction Class Exemption ("PTCE") 96-23 (for certain transactions determined
by in-house asset managers), PTCE 95-60 (for certain transactions involving
insurance company general accounts), PTCE 91-38 (for certain transaction
involving bank collective investment funds), PTCE 90-1 (for certain transactions
involving insurance company separate accounts), or PTCE 84-14 (for certain
transactions determined by independent qualified asset managers). Any purchaser
of the Capital Securities of the Trust or any interest therein will be deemed to
have represented to the Trust that either (a) it is not a Plan and is not
purchasing such securities (or interest therein) on behalf of or with "plan
assets" of any Plan or (b) its purchase and holding of the Capital Securities of
the Trust (or interest therein) is eligible for the exemptive relief available
under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14.
 
                                       41

    Due to the complexity of these rules and the penalties imposed upon persons
involved in prohibited transactions, it is important that any person considering
the purchase of Capital Securities of the Trust with Plan assets consult with
its counsel regarding the consequences under ERISA and the Code of the
acquisition and ownership of Capital Securities of the Trust and the
availability of exemptive relief under the class exemptions listed above. In
JOHN HANCOCK MUTUAL LIFE INSURANCE CO. V. HARRIS TRUST AND SAVINGS BANK, 114
S.Ct. 517 (1993), the Supreme Court ruled that assets held in an insurance
company's general account may be deemed to be "plan assets" for ERISA purposes
under certain circumstances. The issues raised in HARRIS TRUST have also been
the subject of legislative action, and have been addressed in proposed
regulations issued by the U.S. Department of Labor in December 1997.
 
                                       42

                                  UNDERWRITING
 
    Under the terms and subject to the conditions of the Underwriting Agreement
dated             (the "Underwriting Agreement"), each Underwriter named below
(the "Underwriters") has severally agreed to purchase from Citigroup Capital,
and Citigroup Capital has agreed to sell to such Underwriter, the number of
Capital Securities set forth opposite the name of such Underwriter below.
 


                                                                                  NUMBER OF
                                                                                  CAPITAL
UNDERWRITERS                                                                      SECURITIES
- --------------------------------------------------------------------------------  ------------
                                                                               
 
                                                                                  ------------
Total
                                                                                  ------------
                                                                                  ------------

 
    The Underwriters are obligated to take and pay for the total number of
Capital Securities offered hereby if any such Capital Securities are purchased.
In the event of default by any Underwriter, the Underwriting Agreement provides
that, in certain circumstances, purchase commitments of the non-defaulting
Underwriters may be increased or the Underwriting Agreement may be terminated.
 
    Underwriters, dealers and agents may be entitled, under agreements with
Citigroup Capital and the Company, to indemnification by the Company against
certain civil liabilities, including liabilities under the Securities Act.
Underwriters, dealers and agents may be customers of, engage in transactions
with, or perform services for, Citigroup Capital and the Company and affiliates
of Citigroup Capital and the Company in the ordinary course of business.
 
    Citigroup Capital and the Company have agreed, during the period beginning
on the date of the Underwriting Agreement and continuing to and including the
date that is   days after the closing date for the purchase of the Capital
Securities, not to offer, sell, contract to sell or otherwise dispose of any
preferred securities, any preferred stock or any other securities (including any
backup undertakings of such preferred stock or other securities) of the Company
or of Citigroup Capital, in each case that are substantially similar to the
Capital Securities, or any securities convertible into or exchangeable for the
Capital Securities or such substantially similar securities of either Citigroup
Capital or the Company, except securities in the offering or with the prior
written consent of             .
 
    In view of the fact that the proceeds of the sale of the Capital Securities
will ultimately be used to purchase the Junior Subordinated Debt Securities of
the Company, the Underwriting Agreement provides that the Company will pay as
compensation to the Underwriters $      per Capital Security for the accounts of
the several Underwriters ($      in the aggregate); PROVIDED that such
compensation will be $  per Capital Security for sales of 10,000 or more Capital
Securities to a single purchaser. Therefore, to the extent of such sales, the
actual amount of Underwriters' Compensation will be less than the aggregate
amount specified in the preceding sentence.
 
    The Underwriters propose to offer the Capital Securities, in part, directly
to the public at the initial public offering price set forth on the cover page
of this Prospectus, and to certain dealers at a price that represents a
concession not in excess of $      , provided that such concession for sales of
10,000 or more Capital Securities to a single purchaser will not be in excess of
$      per Capital Security. The Underwriters may allow, and such dealers may
reallow, a concession not in excess of $      per Capital Security to certain
brokers and dealers. After the Capital Securities are released for sale to the
public, the offering price and other selling terms may from time to time be
varied by the representatives of the Underwriters.
 
                                       43

    Application will be made to list the Capital Securities on the NYSE. If
approved for listing, we expect the Capital Securities will begin trading on the
NYSE within 30 days after they are first issued.
 
    The broker-dealer subsidiaries of the Company (the "Broker-Dealer
Subsidiaries") are members of the National Association of Securities Dealers,
Inc. (the "NASD") and subsidiaries of the Company, and may participate in
distributions of the Capital Securities. Accordingly, offerings of Capital
Securities in which Broker-Dealer Subsidiaries participate will conform with the
requirements set forth in Rule 2720 of the Conduct Rules of the NASD.
 
    In connection with this offering and in accordance with applicable law and
industry practice, the underwriters may over-allot or effect transactions which
stabilize, maintain or otherwise affect the market price of the Capital
Securities at levels above those which might otherwise prevail in the open
market, including by entering stabilizing bids, effecting syndicate covering
transactions or imposing penalty bids. A stabilizing bid means the placing of
any bid, or the effecting of any purchase, for the purpose of pegging, fixing or
maintaining the price of a security. A syndicate covering transaction means the
placing of any bid on behalf of the underwriting syndicate or the effecting of
any purchase to reduce a short position created in connection with the offering.
A penalty bid means an arrangement that permits the managing underwriter to
reclaim a selling concession from a syndicate member in connection with the
offering when Capital Securities originally sold by the syndicate member are
purchased in syndicate covering transactions. Such transactions may be effected
on the NYSE, in the over-the-counter market, or otherwise. The underwriters are
not required to engage in any of these activities. Any such activities, if
commenced, may be discontinued at any time.
 
    If any Broker-Dealer Subsidiary makes an offering of the Capital Securities,
such offering will be conducted pursuant to the applicable sections of Rule 2810
of the Conduct Rules of the NASD. The Underwriters may not confirm sales to any
discretionary account without the prior specific written approval of a customer.
 
    This Prospectus may also be used by any Broker-Dealer Subsidiary in
connection with offers and sales of the Capital Securities in market-making
transactions at negotiated prices related to prevailing market prices at the
time of sale. Any Broker-Dealer Subsidiary may act as principal or agent in such
transactions. No Broker-Dealer Subsidiary has any obligation to make a market in
any of the Capital Securities and may discontinue any market-making activities
at any time without notice, at its sole discretion.
 
                                 LEGAL MATTERS
 
    The validity of the Capital Securities, the Junior Subordinated Debt
Securities, the Guarantee and certain matters relating thereto and certain
United States federal income tax matters will be passed upon for the Company and
Citigroup Capital by Skadden, Arps, New York, New York. Certain legal matters
will be passed upon for the Underwriters by Dewey Ballantine LLP, New York, New
York. Kenneth J. Bialkin, a partner of Skadden, Arps, is a director of the
Company and he and other attorneys in such firm beneficially own an aggregate of
less than one percent of the common stock of the Company. Dewey Ballantine LLP
has from time to time acted as counsel for the Company and certain of its
subsidiaries and may do so in the future. A member of Dewey Ballantine LLP
participating in this matter is the beneficial owner of shares of the Company's
common stock.
 
                                    EXPERTS
 
    The consolidated financial statements and schedules of Travelers Group Inc.
("Travelers") as of December 31, 1997 and 1996, and for each of the years in the
three-year period ended December 31, 1997, incorporated by reference or included
in Travelers' Annual Report on Form 10-K, as amended, for the year ended
December 31, 1997, and incorporated by reference herein, have been audited by
KPMG Peat Marwick LLP, independent certified public accountants, as set forth in
their reports
 
                                       44

thereon (also incorporated by reference herein), which reports state that KPMG
Peat Marwick LLP did not audit the consolidated financial statements of Salomon
Inc and its subsidiaries, appearing in Salomon Inc's Annual Report on Form 10-K
for the year ended December 31, 1996 (the "Salomon Financials"), as of December
31, 1996, and for each of the two years in the period ended December 31, 1996
and that their opinion with respect to any amounts derived from the Salomon
Financials is based on the report of Arthur Andersen LLP. The consolidated
financial statements of Travelers referred to above are incorporated by
reference herein in reliance upon such reports and upon the authority of said
firms as experts in accounting and auditing.
 
    The consolidated financial statements of Citicorp and its subsidiaries as of
December 31, 1997 and 1996, and for each of the years in the three-year period
ended December 31, 1997, and the related consolidated balance sheets of
Citibank, N.A. and subsidiaries as of December 31, 1997 and 1996, included in
the 1997 Citicorp Annual Report and Form 10-K, have been incorporated by
reference herein, in reliance upon the report (also incorporated by reference
herein) of KPMG Peat Marwick LLP, independent certified public accountants, and
upon the authority of said firm as experts in accounting and auditing.
 
    The supplemental consolidated financial statements and schedule of Citigroup
Inc. (formerly Travelers Group Inc.) ("Citigroup") as of December 31, 1997 and
1996, and for each of the years in the three-year period ended December 31,
1997, included in Citigroup's Current Report on Form 8-K dated October 26, 1998,
have been audited by KPMG Peat Marwick LLP, independent certified public
accountants, as set forth in their report thereon, included therein and
incorporated herein by reference, which report states that KPMG Peat Marwick LLP
did not audit the Salomon Financials (as defined above) and that their opinion
with respect to any amounts derived from the Salomon Financials is based on the
report of Arthur Andersen LLP. Generally accepted accounting principles
proscribe giving effect to a consummated business combination accounted for by
the pooling of interests method in financial statements that do not include the
date of consummation. The supplemental consolidated financial statements do not
extend through the date of consummation. However, they will become the
historical consolidated financial statements of Citigroup after financial
statements covering the date of consummation of the business combination are
issued. The supplemental consolidated financial statements referred to above are
incorporated by reference herein in reliance upon such reports given the
authority of said firms as experts in accounting and auditing. To the extent
that KPMG Peat Marwick LLP audits and reports on consolidated financial
statements of Citigroup issued at future dates, and consents to the use of their
report thereon, such consolidated financial statements also will be incorporated
by reference in the registration statement in reliance upon their report and
said authority.
 
                             AVAILABLE INFORMATION
 
    Our Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports and other information with the SEC. You can inspect and
copy such reports and other information at the public reference facilities
maintained by the SEC at: Room 1024, 450 Fifth Street, N.W., Washington, D.C.
20549; Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois
60661-2511; and Seven World Trade Center, New York, New York 10048. You can also
obtain copies of such material from the Public Reference Section of the SEC at
450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. The SEC
also maintains a site on the World Wide Web, the address of which is
http://www.sec.gov, that contains reports, proxy and information statements and
other information regarding issuers, such as our Company, that file
electronically with the SEC. The Company's common stock is listed on the NYSE
and The Pacific Exchange, Inc., and such reports, proxy statements, and other
information can also be inspected at the offices of the New York Stock Exchange,
Inc., 20 Broad Street, New York, New York 10005, and The Pacific Exchange, Inc.,
301 Pine Street, San Francisco, California 94104, and 233 South Beaudry Avenue,
Los Angeles, California 90012.
 
                                       45

    We have filed with the SEC a Registration Statement on Form S-3 (the
"Registration Statement," which term shall include all amendments, exhibits,
annexes and schedules thereto) pursuant to the Securities Act of 1933, as
amended (the "Securities Act"), with respect to the Capital Securities. This
Prospectus does not contain all the information set forth in the Registration
Statement, certain parts of which are omitted in accordance with the rules and
regulations of the SEC. For further information with respect to the Company and
the Capital Securities, reference is made to the Registration Statement and
exhibits thereto. Statements contained in this Prospectus as to the contents of
any contract or other document are not necessarily complete, and in each
instance reference is made to the copy of such contract or document filed as an
exhibit to the Company's Registration Statement, each such statement being
qualified in all respects by such reference.
 
    No separate financial statements of Citigroup Capital have been included or
incorporated by reference herein. The Company does not consider that such
financial statements would be material to holders of the Capital Securities
because (i) all of the voting securities of the Citigroup Capital will be owned,
directly or indirectly, by the Company, a reporting company under the Exchange
Act, (ii) the Citigroup Capital has no independent operations but exists for the
sole purpose of issuing securities representing undivided beneficial interests
in its assets and investing the proceeds thereof in Junior Subordinated Debt
Securities issued by the Company, and (iii) the obligations of the Citigroup
Capital under the Capital Securities are fully and unconditionally guaranteed by
the Company to the extent that Citigroup Capital has funds available to meet
such obligations. See "Description of the Junior Subordinated Debt Securities"
and "Description of Guarantee."
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    Our Company incorporates by reference into this Prospectus the following
documents previously filed with the SEC pursuant to the Exchange Act:
 
       1.  Annual Report on Form 10-K, as amended, of the Company for the fiscal
           year ended December 31, 1997;
 
       2.  Quarterly Reports on Form 10-Q of the Company for the quarters ended
           March 31, 1998, June 30, 1998 and September 30, 1998; and
 
       3.  Current Reports on Form 8-K of the Company, dated January 6, 1998,
           January 26, 1998, February 17, 1998, April 6, 1998, April 8, 1998,
           April 20, 1998, June 1, 1998, July 20, 1998, August 18, 1998, August
           31, 1998, October 8, 1998, October 21, 1998, October 26, 1998,
           October 29, 1998, November 1, 1998 and November 13, 1998.
 
    Any documents we file pursuant to Section 13(a), 13(c), 14 or 15(d) of the
Exchange Act subsequent to the date of this Prospectus and prior to the later of
(i) the termination of the offering of Capital Securities hereby and (ii) the
date on which any Broker-Dealer Subsidiary ceases offering and selling Capital
Securities pursuant to this Prospectus shall be deemed to be incorporated by
reference in this Prospectus and to be a part hereof from the date of filing of
such document.
 
    Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any other subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed to constitute a part of
this Prospectus except as so modified or superseded.
 
    We will provide without charge to each person to whom this Prospectus is
delivered, on the written or oral request of any such person, a copy of any or
all of the documents incorporated by reference in the Registration Statement of
which this Prospectus forms a part other than exhibits to such documents unless
such exhibits are specifically incorporated by reference into such documents.
Requests should be directed to Citigroup Inc., 153 East 53(rd) Street, New York,
NY 10043; Attention: Treasurer; telephone (212) 559-1000.
 
                                       46

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                        Securities
                               CITIGROUP CAPITAL
 
                               % CAPITAL SECURITIES
 
                             $  LIQUIDATION AMOUNT
 
                  GUARANTEED TO THE EXTENT SET FORTH HEREIN BY
 
                                 CITIGROUP INC.
 
                                     [LOGO]
                                    -------
 
                                   PROSPECTUS
 
                                   ---------
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
    The following table sets forth the various expenses payable by the
Registrants in connection with the Securities being registered hereby. All of
the fees set forth below are estimates except for the Commission Registration
fee and the NASD fee.
 

                                                             
Commission Registration Fee...................................  $1,153,700.00
Accounting Fees...............................................    150,000.00
Trustees' Fees and Expenses...................................     75,000.00
Blue Sky Fees and Expenses....................................     40,000.00
Printing and Engraving Fees...................................    500,000.00
Rating Agency Fees............................................  2,000,000.00
NASD Fee......................................................     30,500.00
Legal Fees and Expenses.......................................    500,000.00
Stock Exchange Listing Fees...................................    254,300.00
Miscellaneous.................................................      6,500.00
                                                                ------------
    Total.....................................................  $4,710,000.00
                                                                ------------
                                                                ------------

 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    Subsection (a) of Section 145 of the General Corporation Law of the State of
Delaware (the "DGCL") empowers a corporation to indemnify any person who was or
is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation) by
reason of the fact that he is or was a director, officer, employee or agent of
the corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by him in connection with such action, suit or proceeding if he acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the corporation, and, with respect to any criminal action
or proceeding, had no reasonable cause to believe his conduct was unlawful.
 
    Subsection (b) of Section 145 of the DGCL empowers a corporation to
indemnify any person who was or is a party or is threatened to be made a party
to any threatened, pending or completed action or suit by or in right of the
corporation to procure a judgment in its favor by reason of the fact that such
person acted in any of the capacities set forth above, against expenses
(including attorneys' fees) actually and reasonably incurred by him in
connection with the defense or settlement of such action or suit if he acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
best interests of the corporation, except that no indemnification may be made in
respect of any claim, issue or matter as to which such person shall have been
adjudged to be liable to the corporation unless and only to the extent that the
Court of Chancery or the court in which such action or suit was brought shall
determine upon application that, despite the adjudication of liability but in
view of all the circumstances of the case, such person is fairly and reasonably
entitled to indemnity for such expenses which the Court of Chancery or such
other court shall deem proper.
 
    Section 145 of the DGCL further provides that to the extent a director or
officer of a corporation has been successful on the merits or otherwise in the
defense of any action, suit or proceeding referred to in subsections (a) and (b)
of Section 145, or in defense of any claim, issue or matter therein, he shall be
indemnified against expenses (including attorneys' fees) actually and reasonably
incurred by him in connection therewith; that indemnification provided for by
Section 145 shall not be deemed exclusive of any other rights to which the
indemnified party may be entitled; that indemnification provided for by Section
145 shall, unless otherwise provided when authorized and ratified, continue as
to such person who has ceased to be a director, officer, employee or agent and
shall inure to the
 
                                      II-1

benefit of such person's heirs, executors and administrators; and empowers the
corporation to purchase and maintain insurance on behalf of a director or
officer of the corporation against any liability asserted against him and
incurred by him in any such capacity, or arising out of his status as such,
whether or not the corporation would have the power to indemnify him against
such liabilities under Section 145. Section Four of Article IV of the Company's
By-Laws provides that the Company shall indemnify its directors and officers to
the fullest extent permitted by the DGCL.
 
    The Company also provides liability insurance for its directors and officers
which provides for coverage against loss from claims made against directors and
officers in their capacity as such, including, subject to certain exceptions,
liabilities under the federal securities laws.
 
    Section 102(b)(7) of the DGCL provides that a certificate of incorporation
may contain a provision eliminating or limiting the personal liability of a
director to the corporation or its stockholders for monetary damages for breach
of fiduciary duty as a director provided that such provision shall not eliminate
or limit the liability of a director (i) for any breach of the director's duty
of loyalty to the corporation or its stockholders, (ii) for acts or omissions
not in good faith or which involve intentional misconduct or a knowing violation
of law, (iii) under Section 174 of the DGCL, or (iv) for any transaction from
which the director derived an improper personal benefit. Article Tenth of the
Company's Restated Certificate of Incorporation limits the liability of
directors to the fullest extent permitted by Section 102(b)(7).
 
    The Declaration of each of the Citigroup Trusts provides that no
Institutional Trustee or any of its affiliates, Delaware Trustee or any of its
affiliates, or officer, director, shareholder, member, partner, employee,
representative custodian, nominee or agent of the Institutional Trustee or the
Delaware Trustee (each a "Fiduciary Indemnified Person"), and no Regular
Trustee, affiliate of any Regular Trustee, or any officer, director,
shareholder, member, partner, employee, representative or agent of any Regular
Trustee, or any employee or agent of such Citigroup Trust or its affiliates
(each a "Company Indemnified Person") shall be liable, responsible or
accountable in damages or otherwise to such Citigroup Trust, any affiliate of
such Citigroup Trust or any holder of securities issued by such Citigroup Trust,
or to any officer, director, shareholder, partner, member, representative,
employee or agent of such Citigroup Trust or its Affiliates for any loss, damage
or claim incurred by reason of any act or omission performed or omitted by such
Fiduciary Indemnified Person or Company Indemnified Person in good faith on
behalf of such Citigroup Trust and in a manner such Fiduciary Indemnified Person
or Company Indemnified Person reasonably believed to be within the scope of the
authority conferred on such Fiduciary Indemnified Person or Company Indemnified
Person by such Declaration or by law, except that a Fiduciary Indemnified Person
or Company Indemnified Person shall be liable for any loss, damage, or claim
incurred by reason of such Fiduciary Indemnified Person's or Company Indemnified
Person's gross negligence (or in the case of a Fiduciary Indemnified Person,
negligence) or willful misconduct with respect to such acts or omissions. The
Declaration of each Citigroup Trust also provides that, to the full extent
permitted by law, the Company shall indemnify any Company Indemnified Person who
was or is a party or is threatened to be made a party to any threatened, pending
or completed action, suit or proceeding, whether civil, criminal, administrative
or investigative (other than an action by or in right of such Citigroup Trust)
by reason of the fact that he is or was a Company Indemnified Person against
expenses (including attorneys' fees), judgments, fines and amounts paid in
settlement actually and reasonably incurred by him in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
Citigroup Trust, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. The Declaration of each
Citigroup Trust also provides that to the full extent permitted by law, the
Company shall indemnify any Company Indemnified Person who was or is a party or
is threatened to be made a party to any threatened, pending or completed action
or suit by or in right of such Citigroup Trust to procure a judgment in its
favor by reason of the fact that he is or was a Company Indemnified Person
against expenses (including attorneys' fees) actually and reasonably incurred by
him in connection with the defense or settlement of such action or suit if he
acted in good faith and in a manner he reasonably believed to be in or not
 
                                      II-2

opposed to the best interests of the Citigroup Trust and except that no
indemnification shall be made in respect of any claim, issue or matter as to
which such Company Indemnified Person shall have been adjudged to be liable to
the Citigroup Trust unless and only to the extent that the Court of Chancery of
Delaware or the court in which such action or suit was brought shall determine
upon application that, despite the adjudication of liability but in view of all
the circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses which such Court of Chancery or such other court
shall deem proper. The Declaration of each Citigroup Trust further provides that
expenses (including attorneys' fees) incurred by a Company Indemnified Person in
defending a civil, criminal, administrative or investigative action, suit or
proceeding referred to in the immediately preceding two sentences shall be paid
by the Company in advance of the final disposition of such action, suit or
proceeding upon receipt of an undertaking by or on behalf of such Company
Indemnified Person to repay such amount if it shall ultimately be determined
that he is not entitled to be indemnified by the Company as authorized in the
Declaration.
 
    The directors and officers of the Company and the Regular Trustee are
covered by insurance policies indemnifying them against certain liabilities,
including certain liabilities arising under the Securities Act, which might be
incurred by them in such capacities and against which they cannot be indemnified
by the Company or the Citigroup Trusts. Any agents, dealers or underwriters who
execute any underwriting or distribution agreement relating to securities
offered pursuant to this Registration Statement will agree to indemnify the
Company's directors and their officers and the Citigroup Trustees who signed the
Registration Statement against certain liabilities that may arise under the
Securities Act with respect to information furnished to the Company or any of
the Citigroup Trusts by or on behalf of such indemnifying party.
 
    For the undertaking with respect to indemnification, see Item 17 herein.
 
    See the forms of Underwriting Agreements and the form of Distribution
Agreement filed or to be filed as Exhibits 1.01, 1.02, 1.03, 1.04, 1.05 and 1.06
for certain indemnification provisions.
 
ITEM 16. EXHIBITS.
 


  EXHIBIT
  NUMBER                                                           DESCRIPTION
- -----------             -------------------------------------------------------------------------------------------------
                  
      1.01      --      Underwriting Agreement Basic Provisions, dated January 12, 1993 relating to Debt Securities
                        (incorporated by reference to Exhibit 1.01 to Amendment No. 1 to the Company's Registration
                        Statement on Form S-3 (No. 33-55542)).
      1.02      --      Form of Underwriting Agreement for Index Warrants will be filed as an Exhibit to a Current Report
                        on Form 8-K and incorporated herein by reference.
      1.03      --      Form of Underwriting Agreement for Preferred Stock (incorporated by reference to Exhibit 1.2 to
                        the Company's Registration Statement on Form S-3 (No. 333-27155)).
      1.04      --      Form of Distribution Agreement relating to the Company's Medium-Term Senior Notes, Series A, and
                        Medium-Term Subordinated Notes, Series A.*
      1.05      --      Form of Underwriting Agreement for Capital Securities.*
      1.06      --      Form of Underwriting Agreement for Common Stock will be filed as an Exhibit to a Current Report
                        on Form 8-K and incorporated herein by reference.
      4.01      --      Restated Certificate of Incorporation of the Company.*
      4.02      --      By-Laws of the Company effective October 8, 1998 (incorporated by reference to Exhibit 3.02 to
                        the Company's Quarterly Report on Form 10-Q dated September 30, 1998).
      4.03      --      Indenture, dated as of March 15, 1987, between Primerica Corporation, a New Jersey corporation,
                        and The Bank of New York, as trustee (incorporated by reference to Exhibit 4.01 to the Company's
                        Registration Statement on Form S-3 (No. 33-55542)).

 
                                      II-3



  EXHIBIT
  NUMBER                                                           DESCRIPTION
- -----------             -------------------------------------------------------------------------------------------------
                  
      4.04      --      First Supplemental Indenture, dated as of December 15, 1988, among Primerica Corporation,
                        Primerica Holdings, Inc. and The Bank of New York, as trustee (incorporated by reference to
                        Exhibit 4.02 to the Company's Registration Statement on Form S-3 (No. 33-55542)).
      4.05      --      Second Supplemental Indenture, dated as of January 31, 1991, between Primerica Holdings, Inc. and
                        The Bank of New York, as trustee (incorporated by reference to Exhibit 4.03 to the Company's
                        Registration Statement on Form S-3 (No. 33-55542)).
      4.06      --      Third Supplemental Indenture, dated as of December 9, 1992, among Primerica Holdings, Inc.,
                        Primerica Corporation and The Bank of New York, as trustee (incorporated by reference to Exhibit
                        5 to the Company's Form 8-A dated December 21, 1992, with respect to the Company's 7 3/4% Notes
                        Due June 15, 1999 (No. 1-9924)).
      4.07      --      Fourth Supplemental Indenture, dated as of November 2, 1998, between the Company and The Bank of
                        New York, as trustee (incorporated by reference to Exhibit 4.01 to the Company's Quarterly Report
                        on Form 10-Q dated September 30, 1998).
      4.08      --      Indenture, dated as of July 17, 1998, between the Company and The First National Bank of Chicago,
                        as trustee (incorporated by reference to Exhibit 4.05 to the Company's Registration Statement on
                        Form S-3 (No. 333-51201)).
      4.09      --      First Supplemental Indenture, dated as of December 15, 1998 between the Company and The First
                        National Bank of Chicago, as trustee.*
      4.10      --      Form of proposed Index Warrant Agreement for Index Warrants, with form of proposed Index Warrant
                        Certificate attached as an exhibit thereto, will be filed as an Exhibit to a Current Report on
                        Form 8-K and incorporated herein by reference.
      4.11      --      Form of Certificate for Preferred Stock will be filed as an exhibit to a Current Report on Form
                        8-K and incorporated herein by reference.
      4.12      --      Form of Deposit Agreement (incorporated by reference to Exhibit 4.17 to the Company's
                        Registration Statement on Form S-3 (No. 333-27155)).
      4.13      --      Form of Depositary Receipt (included in Exhibit 4.12).
      4.14      --      Forms of Medium-Term Senior Notes, Series A and Medium-Term Subordinated Notes, Series A.*
      4.15      --      Certificate of Trust of Citigroup Capital VI, as amended.*
      4.16      --      Certificate of Trust of Citigroup Capital VII, as amended.*
      4.17      --      Certificate of Trust of Citigroup Capital VIII, as amended.*
      4.18      --      Certificate of Trust of Citigroup Capital IX.*
      4.19      --      Certificate of Trust of Citigroup Capital X.*
      4.20      --      Certificate of Trust of Citigroup Capital XI.*
      4.21      --      Certificate of Trust of Citigroup Capital XII.*
      4.22      --      Certificate of Trust of Citigroup Capital XIII.*
      4.23      --      Form of Amended and Restated Declaration of Trust for Citigroup Capital VI.*
      4.24      --      Form of Amended and Restated Declaration of Trust for Citigroup Capital VII.*
      4.25      --      Form of Amended and Restated Declaration of Trust for Citigroup Capital VIII.*
      4.26      --      Form of Amended and Restated Declaration of Trust for Citigroup Capital IX.*
      4.27      --      Form of Amended and Restated Declaration of Trust for Citigroup Capital X.*
      4.28      --      Form of Amended and Restated Declaration of Trust for Citigroup Capital XI.*
      4.29      --      Form of Amended and Restated Declaration of Trust for Citigroup Capital XII.*
      4.30      --      Form of Amended and Restated Declaration of Trust for Citigroup Capital XIII.*
      4.31      --      Form of Indenture between the Company and The Chase Manhattan Bank, as trustee (incorporated by
                        reference to Exhibit 4.11 to the Company's Registration Statement on Form S-3 (No. 333-12439)).

 
                                      II-4



  EXHIBIT
  NUMBER                                                           DESCRIPTION
- -----------             -------------------------------------------------------------------------------------------------
                  
      4.32      --      First Supplemental Indenture, dated as of December 15, 1998, between the Company and The Chase
                        Manhattan Bank, as trustee.*
      4.33      --      Forms of Capital Security for each of the Trusts (included in Exhibits 4.23-4.30).
      4.34      --      Forms of Common Security for each of the Trusts (included in Exhibits 4.23-4.30).
      4.35      --      Form of Guarantee with respect to the Capital Securities of Citigroup Capital VI (incorporated by
                        reference to Exhibit 4.14 to the Company's Registration Statement on Form S-3 (No. 333-27155)).
      4.36      --      Form of Guarantee with respect to the Capital Securities of Citigroup Capital VII (incorporated
                        by reference to Exhibit 4.15 to the Company's Registration Statement on Form S-3 (No.
                        333-27155)).
      4.37      --      Form of Guarantee with respect to the Capital Securities of Citigroup Capital VIII.*
      4.38      --      Form of Guarantee with respect to the Capital Securities of Citigroup Capital IX.*
      4.39      --      Form of Guarantee with respect to the Capital Securities of Citigroup Capital X.*
      4.40      --      Form of Guarantee with respect to the Capital Securities of Citigroup Capital XI.*
      4.41      --      Form of Guarantee with respect to the Capital Securities of Citigroup Capital XII.*
      4.42      --      Form of Guarantee with respect to the Capital Securities of Citigroup Capital XIII.*
      4.43      --      Form of Junior Subordinated Debt Securities (included in Exhibit 4.31).
      5.01      --      Opinion of Stephanie B. Mudick, Esq.*
      5.02      --      Opinion of Skadden, Arps, Slate, Meagher & Flom LLP with respect to the Capital Securities and
                        Preferred Stock.*
     12.01      --      Supplemental Calculation of Ratio of Income to Fixed Charges and Supplemental Calculation of
                        Ratio of Income to Combined Fixed Charges Including Preferred Stock Dividends (incorporated by
                        reference to Exhibit 12.01 to the Company's Current Report on Form 8-K dated November 13, 1998).
     23.01      --      Consent of KPMG Peat Marwick LLP, independent public accountants.*
     23.02      --      Consent of KPMG Peat Marwick LLP, independent public accountants.*
     23.03      --      Consent of KPMG Peat Marwick LLP, independent public accountants.*
     23.04      --      Consent of Arthur Andersen LLP, independent public accountants.*
     23.05      --      Consent of Stephanie B. Mudick, Esq. (included in Exhibit 5.01).
     23.06      --      Consent of Skadden, Arps, Slate, Meagher & Flom LLP (included in Exhibit 5.02).
     24.01      --      Powers of Attorney of certain Directors.*
     25.01      --      Form T-1 Statement of Eligibility and Qualification under the Trust Indenture Act of 1939, as
                        amended, of The Bank of New York, as Trustee under the Indenture dated as of March 15, 1987, as
                        supplemented.*
     25.02      --      Form T-1 Statement of Eligibility and Qualification under the Trust Indenture Act of 1939, as
                        amended, of The First National Bank of Chicago, as Trustee under the Indenture dated as of July
                        17, 1998, as supplemented.*
     25.03      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as trustee under the Declaration of Trust of Citigroup Capital VI.*
     25.04      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as trustee under the Declaration of Trust of Citigroup Capital VII.*
     25.05      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as trustee under the Declaration of Trust of Citigroup Capital VIII.*
     25.06      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as trustee under the Declaration of Trust of Citigroup Capital IX.*

 
                                      II-5



  EXHIBIT
  NUMBER                                                           DESCRIPTION
- -----------             -------------------------------------------------------------------------------------------------
                  
     25.07      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as trustee under the Declaration of Trust of Citigroup Capital X.*
     25.08      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Trustee under the Declaration of Trust of Citigroup Capital XI.*
     25.09      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Trustee under the Declaration of Trust of Citigroup Capital XII.*
     25.10      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Trustee under the Declaration of Trust of Citigroup Capital XIII.*
     25.11      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Trustee under the Indenture dated as of October 7, 1996, as supplemented.*
     25.12      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Guarantee Trustee under the Capital Securities Guarantee of Citigroup Inc. for
                        the benefit of holders of Capital Securities of Citigroup Capital VI.*
     25.13      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Guarantee Trustee under the Capital Securities Guarantee of Citigroup Inc. for
                        the benefit of holders of Preferred Capital Securities of Citigroup Capital VII.*
     25.14      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Guarantee Trustee under the Capital Securities Guarantee of Citigroup Inc. for
                        the benefit of holders of Capital Securities of Citigroup Capital VIII.*
     25.15      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Guarantee Trustee under the Capital Securities Guarantee of Citigroup Inc. for
                        the benefit of holders of Capital Securities of Citigroup Capital IX.*
     25.16      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Guarantee Trustee under the Capital Securities Guarantee of Citigroup Inc. for
                        the benefit of holders of Capital Securities of Citigroup Capital X.*
     25.17      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Guarantee Trustee under the Capital Securities Guarantee of Citigroup Inc. for
                        the benefit of holders of Capital Securities of Citigroup Capital XI.*
     25.18      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Guarantee Trustee under the Capital Securities Guarantee of Citigroup Inc. for
                        the benefit of holders of Capital Securities of Citigroup Capital XII.*
     25.19      --      Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of The Chase
                        Manhattan Bank, as Guarantee Trustee under the Capital Securities Guarantee of Citigroup Inc. for
                        the benefit of holders of Capital Securities of Citigroup Capital XIII.*

 
- ------------------------
 
*   Filed herewith.
 
                                      II-6

ITEM 17. UNDERTAKINGS.
 
    Each of Citigroup Inc., Citigroup Capital VI, Citigroup Capital VII,
Citigroup Capital VIII, Citigroup Capital IX, Citigroup Capital X, Citigroup
Capital XI, Citigroup Capital XII and Citigroup Capital XIII hereby undertakes:
 
        (A)(1) To file, during any period in which offers or sales are being
    made of the securities registered hereby, a post-effective amendment to this
    registration statement:
 
            (i) to include any prospectus required by Section 10(a)(3) of the
                Securities Act of 1933, as amended;
 
            (ii) to reflect in the prospectus any facts or events arising after
                 the effective date of this registration statement (or the most
                 recent post-effective amendment hereof) which, individually or
                 in the aggregate, represent a fundamental change in the
                 information set forth in this registration statement; and
 
           (iii) to include any material information with respect to the plan of
                 distribution not previously disclosed in this registration
                 statement or any material change to such information in this
                 registration statement;
 
       PROVIDED, HOWEVER, that the undertakings set forth in clauses (i) and
       (ii) above do not apply if the information required to be included in a
       post-effective amendment by those clauses is contained in periodic
       reports filed with or furnished to the Securities and Exchange Commission
       by Citigroup Inc. pursuant to Section 13 or Section 15(d) of the
       Securities Exchange Act of 1934, as amended, that are incorporated by
       reference in this registration statement.
 
           (2) That, for the purpose of determining any liability under the
    Securities Act of 1933, as amended, each such post-effective amendment shall
    be deemed to be a new registration statement relating to the securities
    offered herein, and the offering of such securities at that time shall be
    deemed to be the initial bona fide offering thereof.
 
           (3) To remove from registration by means of a post-effective
    amendment any of the securities being registered which remain unsold at the
    termination of the offering.
 
        (B)  That, for purposes of determining any liability under the
    Securities Act of 1933, as amended, each filing of Citigroup Inc.'s annual
    report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange
    Act of 1934, as amended, that is incorporated by reference in this
    registration statement shall be deemed to be a new registration statement
    relating to the securities offered herein, and the offering of such
    securities at that time shall be deemed to be the initial BONA FIDE offering
    thereof.
 
        (C)  Insofar as indemnification for liabilities arising under the
    Securities Act of 1933, as amended, may be permitted to directors, officers
    and controlling persons of any such registrants pursuant to the provisions
    described under Item 15 above, or otherwise, the registrants have been
    advised that in the opinion of the Securities and Exchange Commission such
    indemnification is against public policy as expressed in such Act and is,
    therefore, unenforceable. In the event that a claim for indemnification
    against such liabilities (other than the payment by the registrants of
    expenses incurred or paid by a director, officer or controlling person of
    the registrants in the successful defense of any action, suit or proceeding)
    is asserted by such director, officer or controlling person in connection
    with the securities being registered hereby, the registrants will, unless in
    the opinion of their counsel the matter has been settled by controlling
    precedent, submit to a court of appropriate jurisdiction the question
    whether such indemnification by it is against public policy as expressed in
    such Act and will be governed by the final adjudication of such issue.
 
        (D)(1) For purposes of determining any liability under the Securities
    Act of 1933, as amended, the information omitted from the form of prospectus
    filed as part of this registration statement in
 
                                      II-7

    reliance upon Rule 430A and contained in a form of prospectus filed by the
    registrants pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities
    Act of 1933, as amended, shall be deemed to be part of this registration
    statement as of the time it was declared effective.
 
           (2) For the purpose of determining any liability under the Securities
    Act of 1933, as amended, each post-effective amendment that contains a form
    of prospectus shall be deemed to be a new registration statement relating to
    the securities offered therein, and the offering of such securities at that
    time shall be deemed to be the initial BONA FIDE offering thereof.
 
                                      II-8

                                   SIGNATURES
 
    Pursuant to the requirements of the Securities Act of 1933, as amended,
Citigroup Inc. certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused this
Registration Statement or Amendment thereto to be signed on its behalf by the
undersigned, thereunto duly authorized, in The City of New York, State of New
York, this 15(th) day of December, 1998.
 

                                                   
                                              CITIGROUP INC.
 
                                              By:        /s/ HEIDI G. MILLER
                                                         -----------------------------------------
                                                         Heidi G. Miller
                                                         Chief Financial Officer

 
    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT OR AMENDMENT THERETO HAS BEEN SIGNED BELOW BY THE
FOLLOWING PERSONS IN THE CAPACITIES INDICATED THIS 15(TH) DAY OF DECEMBER, 1998.
 


                       SIGNATURES
- --------------------------------------------------------
 
                                                       
                    /s/ JOHN S. REED                      Chairman of the Board, Co-Chief Executive Officer
      --------------------------------------------        (Principal Executive Officer) and Director
                      John S. Reed
 
                  /s/ SANFORD I. WEILL                    Chairman of the Board, Co-Chief Executive Officer
      --------------------------------------------        (Principal Executive Officer) and Director
                    Sanford I. Weill
 
                  /s/ HEIDI G. MILLER                     Chief Financial Officer
      --------------------------------------------        (Principal Financial Officer)
                    Heidi G. Miller
 
                   /s/ IRWIN ETTINGER                     Chief Accounting Officer
      --------------------------------------------        (Principal Accounting Officer)
                     Irwin Ettinger
 
                  /s/ ROGER W. TRUPIN                     Controller (Principal Accounting Officer)
      --------------------------------------------
                    Roger W. Trupin
 
                           *                              Director
      --------------------------------------------
                  C. Michael Armstrong
 
                           *                              Director
      --------------------------------------------
                      Judith Arron
 
                           *                              Director
      --------------------------------------------
                    Alain J.P. Belda
 
                           *                              Director
      --------------------------------------------
                   Kenneth J. Bialkin
 
                           *                              Director
      --------------------------------------------
                    Kenneth T. Derr
 
                           *                              Director
      --------------------------------------------
                     John M. Deutch

 
                                      II-9


                                                       
                           *                              Director
      --------------------------------------------
                   Ann Dibble Jordan
 
                           *                              Director
      --------------------------------------------
                      Reuben Mark
 
                           *                              Director
      --------------------------------------------
                    Michael T. Masin
 
                           *                              Director
      --------------------------------------------
                    Dudley C. Mecum
 
                           *                              Director
      --------------------------------------------
                   Richard D. Parsons
 
                           *                              Director
      --------------------------------------------
                   Andrall E. Pearson
 
                           *                              Director
      --------------------------------------------
                   Robert B. Shapiro
 
                           *                              Director
      --------------------------------------------
                   Franklin A. Thomas
 
                           *                              Director
      --------------------------------------------
                    Edgar S. Woolard
 
                           *                              Director
      --------------------------------------------
                     Arthur Zankel

 

        
*By:                  /s/ HEIDI G. MILLER
           ----------------------------------------
                        Heidi G. Miller
                       Attorney-in-Fact

 
                                     II-10

                                   SIGNATURES
 
    Pursuant to the requirements of the Securities Act of 1933, as amended, each
of Citigroup Capital VI, Citigroup Capital VII, Citigroup Capital VIII,
Citigroup Capital IX, Citigroup Capital X, Citigroup Capital XI, Citigroup
Capital XII and Citigroup Capital XIII certifies that it has reasonable grounds
to believe that it meets all of the requirements for filing on Form S-3 and has
duly caused this Registration Statement or Amendment thereto to be signed on its
behalf by the undersigned, thereunto duly authorized, in The City of New York,
State of New York, this 15(th) day of December, 1998.
 

                               
                                CITIGROUP CAPITAL VI
 
                                By:               /s/ ROBERT MATZA
                                     -----------------------------------------
                                              Robert Matza, as Trustee
 
                                By:              /s/ IRWIN ETTINGER
                                     -----------------------------------------
                                             Irwin Ettinger, as Trustee
 
                                CITIGROUP CAPITAL VII
 
                                By:               /s/ ROBERT MATZA
                                     -----------------------------------------
                                              Robert Matza, as Trustee
 
                                By:              /s/ IRWIN ETTINGER
                                     -----------------------------------------
                                             Irwin Ettinger, as Trustee
 
                                CITIGROUP CAPITAL VIII
 
                                By:               /s/ ROBERT MATZA
                                     -----------------------------------------
                                              Robert Matza, as Trustee
 
                                By:              /s/ IRWIN ETTINGER
                                     -----------------------------------------
                                             Irwin Ettinger, as Trustee
 
                                CITIGROUP CAPITAL IX
 
                                By:               /s/ ROBERT MATZA
                                     -----------------------------------------
                                              Robert Matza, as Trustee
 
                                By:              /s/ IRWIN ETTINGER
                                     -----------------------------------------
                                             Irwin Ettinger, as Trustee

 
                                     II-11


                               
                                CITIGROUP CAPITAL X
 
                                By:               /s/ ROBERT MATZA
                                     -----------------------------------------
                                              Robert Matza, as Trustee
 
                                By:              /s/ IRWIN ETTINGER
                                     -----------------------------------------
                                             Irwin Ettinger, as Trustee
 
                                CITIGROUP CAPITAL XI
 
                                By:               /s/ ROBERT MATZA
                                     -----------------------------------------
                                              Robert Matza, as Trustee
 
                                By:              /s/ IRWIN ETTINGER
                                     -----------------------------------------
                                             Irwin Ettinger, as Trustee
 
                                CITIGROUP CAPITAL XII
 
                                By:               /s/ ROBERT MATZA
                                     -----------------------------------------
                                              Robert Matza, as Trustee
 
                                By:              /s/ IRWIN ETTINGER
                                     -----------------------------------------
                                             Irwin Ettinger, as Trustee
 
                                CITIGROUP CAPITAL XIII
 
                                By:               /s/ ROBERT MATZA
                                     -----------------------------------------
                                              Robert Matza, as Trustee
 
                                By:              /s/ IRWIN ETTINGER
                                     -----------------------------------------
                                             Irwin Ettinger, as Trustee

 
                                     II-12