AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 16, 1996
 
                                                      REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              -------------------
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                              -------------------
                                UNUM CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
                  2211 CONGRESS STREET, PORTLAND, MAINE 04122
                                 (207) 770-2211
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 

                                       
               DELAWARE                                 01-0405657
       (STATE OF INCORPORATION)              (I.R.S. EMPLOYER IDENTIFICATION
                                                         NUMBER)

 
                            ------------------------
                                KEVIN J. TIERNEY
              SENIOR VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
                                UNUM CORPORATION
                              2211 CONGRESS STREET
                             PORTLAND, MAINE 04122
                                 (207) 770-2211
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------
                                   COPIES TO:
 

                                                
    JOHN-PAUL DEROSA           PHYLLIS G. KORFF         WILLIAM D. TORCHIANA
    UNUM CORPORATION         SKADDEN, ARPS, SLATE,       SULLIVAN & CROMWELL
  2211 CONGRESS STREET          MEAGHER & FLOM            125 BROAD STREET
  PORTLAND, MAINE 04122        919 THIRD AVENUE       NEW YORK, NEW YORK 10004
                           NEW YORK, NEW YORK 10022

 
                            ------------------------
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
  From time to time after the effective date of this Registration Statement as
                        determined by 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, please 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, please 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
under the Securities Act, please check the following box. / /
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
 


 TITLE OF EACH CLASS OF           AMOUNT           PROPOSED MAXIMUM      PROPOSED MAXIMUM
    SECURITIES TO BE              TO BE             OFFERING PRICE          AGGREGATE             AMOUNT OF
       REGISTERED             REGISTERED(1)          PER UNIT(2)        OFFERING PRICE(1)      REGISTRATION FEE
                                                                                 
Debt Securities(3).......                                100%
Preferred Stock, $.10 par                                 --
 value(3)................
Common Stock, $.10 par       $404,500,000(5)              --            $404,500,000(5)(6)         $139,484
 value(3)(4).............
Warrants(7)..............                                 --

 
(1) In United States  dollars or the equivalent  thereof in any other  currency,
    currency unit or units, or composite currency or currencies.
(2) Estimated solely for the purpose of computing the registration fee.
(3)  Also includes  such indeterminate number  of Debt Securities  and shares of
    Common Stock  and  Preferred Stock  as  may  be issued  upon  conversion  or
    exchange  of  any  Debt  Securities  or  Preferred  Stock  that  provide for
    conversion or exchange into  other Securities or  upon exercise of  Warrants
    for such Securities.
(4)  Includes Share Purchase Rights. Prior  to the occurrence of certain events,
    the Rights will not be exercisable  or evidenced separately from the  Common
    Stock.
(5) Such amount represents the principal amount of any Debt Securities issued at
    their  principal amount, the issue price rather than the principal amount of
    any Debt Securities issued  at an original  issue discount, the  liquidation
    preference  of any  Preferred Stock,  the amount  computed pursuant  to Rule
    457(c) for  any  Common Stock,  the  issue price  of  any Warrants  and  the
    exercise price of any Securities issuable upon exercise of Warrants.
(6)  No  separate  consideration  will  be  received  for  the  Debt Securities,
    Preferred Stock or Common Stock issuable  upon conversion of or in  exchange
    for Debt Securities or Preferred Stock.
(7)  Warrants may be sold separately or with Debt Securities, Preferred Stock or
    Common Stock.
 
    Pursuant to  Rule  429 under  the  Securities  Act of  1933  the  Prospectus
included  herein also  relates to $95,500,000  of securities  registered as Debt
Securities, Preferred  Stock,  Common  Stock  and  Warrants  under  Registration
Statement  No. 33-69132, which was declared effective on October 8, 1993. In the
event any of  such previously  registered Securities  are offered  prior to  the
effective  date of  this Registration Statement,  the amount  of such Securities
will not be included in any Prospectus hereunder. The amount of Securities being
registered, together with the remaining Securities registered under Registration
Statement No. 33-69132, represents  the maximum amount  of Securities which  are
expected to be offered for sale.
                            ------------------------
 
    THE  REGISTRANT HEREBY  AMENDS THIS REGISTRATION  STATEMENT ON  SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT 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 OR  UNTIL THIS REGISTRATION  STATEMENT SHALL  BECOME
EFFECTIVE  ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

                   SUBJECT TO COMPLETION, DATED JULY 16, 1996
 
                                UNUM CORPORATION
                       DEBT SECURITIES, PREFERRED STOCK,
                           COMMON STOCK AND WARRANTS
                               -----------------
 
    UNUM Corporation may from  time to time offer,  together or separately,  its
(i)  debt securities  (the "Debt  Securities") which  may be  either senior debt
securities (the "Senior Debt Securities")  or subordinated debt securities  (the
"Subordinated  Debt Securities"); (ii)  shares of its  preferred stock, $.10 par
value (the "Preferred Stock"); (iii) shares of its common stock, $.10 par  value
(the  "Common Stock"); and (iv) warrants  to purchase Debt Securities, Preferred
Stock, Common Stock or other securities of the Company as shall be designated by
the Company at the time of offering (the "Warrants"), in amounts, at prices  and
on  terms  to  be determined  at  the  time of  offering.  The  Debt Securities,
Preferred  Stock,  Common  Stock  and  Warrants  are  collectively  called   the
"Securities."
 
    The  Securities offered pursuant to this Prospectus  may be issued in one or
more series or issuances  and will be limited  to $500,000,000 aggregate  public
offering  price (or its equivalent (based on the applicable exchange rate at the
time of sale)  in one or  more foreign currencies,  currency units or  composite
currencies as shall be designated by the Company). Certain specific terms of the
particular Securities in respect of which this Prospectus is being delivered are
set   forth  in   the  accompanying   Prospectus  Supplement   (the  "Prospectus
Supplement"), including, where applicable, (i)  in the case of Debt  Securities,
the specific title, aggregate principal amount, whether such Debt Securities are
Senior  Debt Securities or Subordinated  Debt Securities, maturity date, initial
public offering or purchase price, interest  rate or rates (which may be  fixed,
floating  or adjustable)  and timing of  payments thereof,  yield, provision for
redemption or sinking fund requirements,  if any, currencies of denomination  or
currencies  otherwise applicable thereto,  terms for any  conversion or exchange
into Common Stock or other securities or property of the Company, in the case of
Subordinated Debt  Securities,  any  other  variable terms,  any  listing  on  a
securities  exchange and methods of distribution;  (ii) in the case of Preferred
Stock, the specific  title, the  aggregate amount, any  dividend (including  the
method of calculating payment of dividends), liquidation, redemption, voting and
other  rights, any  terms for  any conversion or  exchange into  Common Stock or
other securities or  property of the  Company, methods of  distribution and  the
initial  public offering or purchase price and other special terms; (iii) in the
case of Common  Stock, the methods  of distribution and  the public offering  or
purchase  price; and (iv) in the case of Warrants, the securities of the Company
which are  issuable upon  exercise of  the Warrants,  the exercise  period,  the
methods  of distribution, the initial public  offering or purchase price and the
exercise  price  and  detachability  of  such  Warrants  if  issued  with  other
securities.  All or a portion of the Debt Securities of a series may be issuable
in temporary or permanent global form.  The Company's Common Stock is listed  on
the  New York Stock  Exchange and the  Pacific Stock Exchange  under the trading
symbol "UNM." Any Common Stock sold pursuant to a Prospectus Supplement will  be
listed on such exchanges, subject to official notice of issuance.
 
    The  Debt  Securities will  be unsecured.  Unless  otherwise specified  in a
Prospectus Supplement, the  Senior Debt  Securities will rank  equally with  all
other unsecured and unsubordinated indebtedness of the Company. The Subordinated
Debt  Securities  will  be  subordinated  in  right  of  payment  to  all Senior
Indebtedness of the Company (as hereinafter defined).
 
    The Prospectus Supplement may contain information concerning certain  United
States  Federal income tax  considerations applicable to  the Securities offered
therein.
 
    The Securities  may be  sold  by the  Company  directly or  through  agents,
underwriters  or  dealers,  as  designated  from  time  to  time  or  through  a
combination of  such  methods.  If agents  of  the  Company or  any  dealers  or
underwriters are involved in the sale of the Securities in respect of which this
Prospectus is being delivered, the names of such agents, dealers or underwriters
and  any applicable  commissions or  discounts will  be set  forth in  or may be
calculated from the Prospectus Supplement  with respect to such Securities.  See
"Plan of Distribution."
 
    This  Prospectus may  not be used  to consummate sales  of Securities unless
accompanied by a Prospectus Supplement.
 
 THESE SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES  AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
  AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
    ACCURACY  OR  ADEQUACY OF  THIS PROSPECTUS.  ANY REPRESENTATION  TO THE
                        CONTRARY IS A CRIMINAL OFFENSE.
                              -------------------
 
              THE DATE OF THIS PROSPECTUS IS              , 1996.

    NO PERSON  HAS  BEEN AUTHORIZED  TO  GIVE ANY  INFORMATION  OR TO  MAKE  ANY
REPRESENTATIONS  OTHER THAN THOSE CONTAINED OR INCORPORATED BY REFERENCE IN THIS
PROSPECTUS IN CONNECTION  WITH THE OFFER  CONTAINED IN THIS  PROSPECTUS AND,  IF
GIVEN  OR MADE, SUCH INFORMATION  OR REPRESENTATIONS MUST NOT  BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY  THE COMPANY OR ANY  UNDERWRITERS, DEALERS OR  AGENTS.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR SOLICITATION OF AN OFFER
TO  BUY SECURITIES IN ANY  JURISDICTION TO ANY PERSON TO  WHOM IT IS UNLAWFUL TO
MAKE SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY
SALE MADE HEREUNDER SHALL, UNDER  ANY CIRCUMSTANCES, CREATE AN IMPLICATION  THAT
THERE  HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR
THAT THE INFORMATION CONTAINED HEREIN IS  CORRECT AT ANY TIME SUBSEQUENT TO  THE
DATE HEREOF.
 
                                 NORTH CAROLINA
 
    The  Commissioner  of  Insurance of  the  State  of North  Carolina  has not
approved or disapproved this offering nor  has the commissioner passed upon  the
accuracy or adequacy of this Prospectus.
 
                             AVAILABLE INFORMATION
 
    The  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,  proxy  statements  and  other  information  with the
Securities and  Exchange  Commission  (the  "Commission").  Reports,  proxy  and
information  statements  and  other  information filed  by  the  Company  can be
inspected and  copied  at the  public  reference facilities  maintained  by  the
Commission  at Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and at
the following  Regional  Offices of  the  Commission: Midwest  Regional  Office,
Citicorp  Center,  500  West  Madison  Street,  Suite  1400,  Chicago,  Illinois
60661-2511 and Northeast Regional Office, 7 World Trade Center, 13th Floor,  New
York,  New York 10048. Copies  of such material can  be obtained from the Public
Reference Section of the Commission at 450 Fifth Street, N.W., Washington,  D.C.
20549at    prescribed   rates.    The   Commission   maintains    a   Web   site
(http://www.sec.gov) that contains reports, proxy and information statements and
other information  regarding  registrants  that  file  electronically  with  the
Commission.  Reports,  proxy and  information  statements and  other information
concerning the Company  may also be  inspected at  the offices of  the New  York
Stock  Exchange, Inc., 20 Broad Street, New York, New York 10005 and the Pacific
Stock Exchange,  301 Pine  Street,  San Francisco,  California 94104,  on  which
certain of the Company's securities are listed.
 
    The  Company has filed with the  Commission a registration statement on Form
S-3 under the Securities  Act of 1933, as  amended (the "Securities Act"),  with
respect  to the Securities  offered hereby (the  "Registration Statement"). This
Prospectus does not contain all of the information set forth in the Registration
Statement, certain parts of which are  omitted in accordance with the rules  and
regulations  of the Commission. Reference is  made to the Registration Statement
and to the exhibits relating thereto for further information with respect to the
Company and the Securities offered hereby.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The Company's Annual Report on Form 10-K for the fiscal year ended  December
31, 1995 (except for Items 7 and 8 of Part II and Item 14 of Part IV), Quarterly
Report on Form 10-Q for the three-month period ended March 31, 1996, and Current
Report  on  Form 8-K  dated January  24, 1996,  filed by  the Company  under the
Exchange Act,  and the  description  of the  Company's  Common Stock  and  Share
Purchase  Rights Plan contained in its Registration Statements filed pursuant to
Section 12 of the Exchange Act and any amendment or report filed for the purpose
of updating those descriptions, are incorporated herein by reference.
 
    All documents filed by the Company  with the Commission pursuant to  Section
13(a),  13(c), 14 or 15(d) of the Exchange Act subsequent to the date hereof and
prior to  the termination  of the  offering of  the Securities  shall hereby  be
deemed  to be incorporated  by reference into  this Prospectus and  to be a part
hereof from the date of filing of  such documents. 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 or in
the accompanying Prospectus  Supplement modifies or  supersedes such  statement.
Any  such statement so modified or superseded  shall not be deemed, except as so
modified or superseded, to constitute a part of this Prospectus.
 
    The Company  will  provide  without  charge to  each  person  to  whom  this
Prospectus  is delivered, on written  or oral request of  such person, a copy of
any or  all of  the  foregoing documents  incorporated  by reference  into  this
Prospectus  (without exhibits to such documents other than exhibits specifically
incorporated by reference into such documents). Requests for such copies  should
be  directed to  the office  of the  Secretary, UNUM  Corporation, 2211 Congress
Street, Portland, Maine, 04122, telephone number (207) 770-4319.
 
                                       2

                                  THE COMPANY
 
    UNUM Corporation ("the Company") is a Delaware corporation organized in 1985
as  an insurance holding company. The  Company and its subsidiaries ("UNUM") are
the leading providers of group long  term disability insurance ("group LTD")  in
the  United States  and the  United Kingdom.  UNUM is  also a  major provider of
employee benefits, individual disability insurance and special risk reinsurance.
UNUM also markets long term care  and retirement income products. UNUM is  based
in  Portland, Maine and through its affiliates has offices in North America, the
United Kingdom and the  Pacific Rim. The  Company's principal executive  offices
are  located at  2211 Congress Street,  Portland, Maine 04122  and its telephone
number is (207) 770-2211.
 
    The operations of the following  subsidiaries account for substantially  all
of  UNUM's  consolidated assets  and revenues:  UNUM  Life Insurance  Company of
America ("UNUM America"), the leading provider of group disability insurance  in
the  nation and a provider  of employee benefits, long  term care and retirement
products; First  UNUM  Life Insurance  Company  (New York  state  only)  ("First
UNUM");  Commercial Life Insurance  Company, a leader  in special risk insurance
and professional  association insurance  marketing;  UNUM Limited,  the  leading
group  disability insurance  provider in the  United Kingdom;  Duncanson & Holt,
Inc., a leading accident and  health reinsurance underwriting manager;  Colonial
Life  & Accident  Insurance Company  ("Colonial"), a  leader in payroll-deducted
voluntary employee benefits offered  to employees at  their worksites; and  UNUM
Japan Accident Insurance Company Limited.
 
BUSINESS SEGMENTS
 
    UNUM   reports  its  operations  principally   in  four  business  segments:
Disability Insurance, Special Risk  Insurance, Colonial Products and  Retirement
Products.  Corporate  includes  transactions  that  are  generally non-insurance
related and interest expense on corporate borrowings.
 
    DISABILITY INSURANCE SEGMENT.   The Disability  Insurance segment, which  in
1995  accounted for  60.0% of  UNUM's revenues  and 56.8%  of its  income before
income taxes, includes disability products offered in North America, the  United
Kingdom  and Japan including: group LTD, individual disability, group short term
disability, association group disability,  disability reinsurance and long  term
care insurance.
 
    Group  LTD  is the  Disability Insurance  segment's principal  product. UNUM
America and First UNUM  target sales of group  LTD to executive,  administrative
and  management personnel, and other professionals. Since 1976, UNUM America and
First UNUM combined have been the  United States' leading provider of group  LTD
according  to EMPLOYEE BENEFIT  PLAN REVIEW, a  recognized industry publication.
UNUM  Limited  targets   group  LTD   sales  to   management  personnel,   other
professionals,  and technical and skilled artisans. UNUM Limited was the leading
provider for 1995 of group LTD insurance  in the United Kingdom, as reported  by
Employers Re. International.
 
    SPECIAL  RISK INSURANCE SEGMENT.  The Special Risk Insurance segment in 1995
accounted for 18.2%  of UNUM's revenues  and 15.8% of  its income before  income
taxes.  The Special  Risk Insurance  segment includes  group life,  special risk
accident   insurance,   non-disability   reinsurance   operations,   reinsurance
underwriting management operations and other special risk insurance products.
 
    COLONIAL  PRODUCTS SEGMENT.  The Colonial Products segment in 1995 accounted
for 12.8% of UNUM's revenues  and 23.0% of its  income before income taxes.  The
Colonial  Products  segment  includes  Colonial  and  affiliates.  Colonial, the
principal subsidiary,  markets  a  broad  line  of  payroll-deducted,  voluntary
benefits  to  employees  at  their worksites,  while  focusing  on  accident and
sickness, cancer and life products.
 
    RETIREMENT PRODUCTS SEGMENT.  The Retirement Products segment accounted  for
8.7%  of UNUM's revenues  and 11.9% of  its income before  income taxes in 1995.
This segment markets and services tax-
 
                                       3

sheltered annuities in UNUM America and  First UNUM. This segment also  includes
guaranteed  investment contracts, deposit administration accounts, 401(k) plans,
individual life and group medical insurance, all of which are no longer actively
marketed by UNUM.
 
RECENT DEVELOPMENTS
 
    During the first quarter of 1996,  UNUM America and First UNUM entered  into
an  agreement  for  the sale  of  their respective  group  tax-sheltered annuity
("TSA") businesses  to The  Lincoln National  Life Insurance  Company  ("Lincoln
Life"),  a part of Lincoln National Corporation, and to a new New York insurance
subsidiary of Lincoln Life. The sale, which is subject to regulatory  approvals,
involves  approximately 1,700 group contractholders  and assets under management
of  approximately  $3   billion.  The  agreement   initially  contemplates   the
reinsurance of these contracts under an indemnity reinsurance arrangement. These
contracts   will  then  be  reinsured  pursuant  to  an  assumption  reinsurance
arrangement upon consent  of the  TSA contractholders  and/or participants.  The
purchase  price (ceding commission)  at closing is  expected to be approximately
$70 million. It is anticipated  that it will take  several months to obtain  the
necessary approvals and otherwise close the sale. There is no guarantee that the
sale will close.
 
    On February 7, 1996, UNUM announced plans to merge Commercial Life Insurance
Company  into UNUM  America to accelerate  growth of its  special risk business,
increase its  commitment  to  the  association group  business  and  to  improve
operating  and capital efficiencies. The merger  is expected to become effective
on December 31, 1996, subject to regulatory approvals.
 
    On December 29, 1993,  UNUM filed suit in  the United States District  Court
for  the District  of Maine, seeking  a federal  income tax refund.  The suit is
based on a claim for a deduction in certain prior tax years, for $652 million in
cash and  stock  distributed  to  policyholders  in  connection  with  the  1986
conversion  of Union Mutual Life Insurance Company  to a stock company. UNUM has
fully paid, and provided  for in prior years'  financial statements, the tax  at
issue  in  this litigation.  On  May 23,  1996,  the District  Court  issued its
decision that the  distribution in  question was not  a deductible  expenditure.
UNUM  believes its claims are meritorious, and expects to appeal the decision to
the Court  of Appeals  for the  First Circuit.  The ultimate  recovery, if  any,
cannot be determined at this time.
 
INVESTMENTS
 


                                                                  DECEMBER 31, 1995        DECEMBER 31, 1994
                                                               -----------------------  -----------------------
                                                                CARRYING       FAIR      CARRYING       FAIR
                                                                 AMOUNT       VALUE       AMOUNT       VALUE
                                                               -----------  ----------  -----------  ----------
                                                                            (DOLLARS IN MILLIONS)
                                                                                         
Fixed maturities:
  Available for sale.........................................  $   9,135.4  $  9,135.4  $   1,640.6  $  1,640.6
  Held to maturity...........................................           --          --      6,227.2     6,168.6
Equity securities available for sale.........................         25.2        25.2        627.9       627.9
Mortgage loans...............................................      1,163.4     1,274.9      1,216.3     1,265.4
Real estate..................................................        222.2                    190.8
Policy loans.................................................        219.2       219.2        201.0       201.0
Other long-term investments..................................         30.4                     38.1
Short-term investments.......................................        896.7       896.7        291.9       291.9
                                                               -----------              -----------
      Total investments......................................  $  11,692.5              $  10,433.8
                                                               -----------              -----------
                                                               -----------              -----------

 
    UNUM's  investment portfolio is concentrated in investment grade bonds. UNUM
evaluates total expected return after  consideration of associated expenses  and
losses,  within  criteria  established  for  each  product  line.  Product  line
investment strategies are developed to complement business risks by meeting  the
liquidity  and solvency requirements of each product. UNUM purchases assets with
maturities, expected cash  flows and prepayment  conditions that are  consistent
with these strategies. The
 
                                       4

nature  and quality of the types of investments comply with policies established
by  management,  which  are  more  stringent  overall  than  the  statutes   and
regulations  imposed by the jurisdictions in which UNUM's insurance subsidiaries
are licensed.  UNUM's investments  are reported  in the  consolidated  financial
statements  at  net realizable  value or  net of  any applicable  allowances for
probable losses.
 
    During the second  quarter of 1995,  UNUM sold virtually  all of the  common
stock   portfolio  of   its  United   States  subsidiaries,   primarily  due  to
consideration of statutory  capital requirements associated  with investment  in
common  stocks and to increase future investment income. UNUM has reinvested the
proceeds from the  sale of the  common stock portfolio  primarily in  investment
grade  fixed  income  assets.  Dependent on  capital  considerations  and market
conditions, UNUM may invest in equity securities in the future.
 
    In November 1995, the  FASB issued "A Guide  to Implementation of  Statement
115  on Accounting for Certain Investments in Debt and Equity Securities," which
provided  a  one-time  opportunity  to  reassess  the  appropriateness  of   the
classifications  of securities  described in  FAS 115,  and to  reclassify fixed
maturities from the held to maturity category without calling into question  the
intent  to hold other debt securities to maturity in the future. On December 31,
1995, UNUM reassessed  its fixed maturity  portfolio and, as  allowed under  the
implementation guidance, reclassified fixed maturities with an amortized cost of
$6,082.8  million and a related  net unrealized gain of  $393.0 million from the
held to maturity category to available for sale.
 
    At December 31, 1995, the  fixed maturity portfolio included $139.4  million
of  below investment  grade bonds  (below "Baa")  recorded at  fair value, which
represented 1.5%  of  the  fixed  maturity  portfolio,  and  had  an  associated
amortized  cost of $133.8 million.  At December 31, 1994,  the carrying value of
below investment grade bonds included in the fixed maturity portfolio was $193.8
million, which represented  2.5% of  the fixed  maturity portfolio,  and had  an
associated  market value  of $193.4  million. The  percentage of  mortgage loans
delinquent 60 days or more on a contract delinquency basis was 0.2% and 1.8%  at
December 31, 1995, and 1994, respectively.
 
                                       5

              SELECTED CONSOLIDATED FINANCIAL DATA OF THE COMPANY
 


                                                                                 YEAR ENDED DECEMBER 31,
                                                              -------------------------------------------------------------
                                                                 1995        1994        1993           1992        1991
                                                              ----------  ----------  ----------     ----------  ----------
                                                                      (DOLLARS IN MILLIONS, EXCEPT PER SHARE DATA)
                                                                                                  
INCOME STATEMENT DATA
Revenues
  Premiums..................................................  $  3,018.2  $  2,721.3  $  2,474.1     $  2,142.4  $  1,938.9
  Net investment income (a).................................     1,031.4       815.8       839.8          850.7       811.6
  Fees and other income.....................................        73.3        75.5        83.1           55.4        34.0
                                                              ----------  ----------  ----------     ----------  ----------
Total revenues..............................................     4,122.9     3,612.6     3,397.0        3,048.5     2,784.5
Benefits and expenses
  Benefits to policyholders.................................     2,493.0     2,239.0     1,775.7        1,532.6     1,387.1
  Interest credited.........................................       227.4       242.7       281.0          328.4       357.7
  Operating expenses........................................       728.2       713.0       675.6          590.9       554.8
  Commissions...............................................       369.9       355.9       326.8          298.9       258.8
  Increase in deferred policy acquisition costs.............      (114.7)     (155.3)     (135.1)        (111.7)     (104.8)
  Interest expense..........................................        37.2        18.7        12.7           10.9        11.3
                                                              ----------  ----------  ----------     ----------  ----------
    Total benefits and expenses.............................     3,741.0     3,414.0     2,936.7        2,650.0     2,464.9
                                                              ----------  ----------  ----------     ----------  ----------
Income before income taxes and cumulative effects of
 accounting changes.........................................       381.9       198.6       460.3          398.5       319.6
Income taxes................................................       100.8        43.9       148.3          107.3        74.3
                                                              ----------  ----------  ----------     ----------  ----------
Income before cumulative effects of accounting changes......       281.1       154.7       312.0          291.2       245.3
Cumulative effects of accounting changes....................          --          --       (12.1)            --          --
                                                              ----------  ----------  ----------     ----------  ----------
    Net Income..............................................  $    281.1  $    154.7  $    299.9     $    291.2  $    245.3
                                                              ----------  ----------  ----------     ----------  ----------
                                                              ----------  ----------  ----------     ----------  ----------
BALANCE SHEET DATA
(at end of period)
Assets......................................................  $ 14,787.8  $ 13,127.2  $ 12,437.3     $ 11,959.8  $ 11,310.9
Short-term debt.............................................  $    126.5  $    246.6  $    110.0     $    122.7  $    150.1
Long-term debt..............................................  $    457.3  $    182.1  $    128.6     $     77.2  $     51.5
Stockholders' equity........................................  $  2,302.9  $  1,915.4  $  2,102.7     $  2,010.9  $  1,755.5
 
OTHER DATA
Earnings per share..........................................  $     3.87  $     2.09  $     3.81(b)  $     3.71  $     3.15
Dividends paid per share....................................  $    1.035  $     0.92  $    0.765     $    0.625  $     0.49
Book value per share........................................  $    31.54  $    26.45  $    27.67     $    25.44  $    22.46
Number of shares (millions):
  Shares outstanding........................................        73.0        72.4        76.0           79.1        78.2
  Weighted average shares outstanding.......................        72.7        74.2        78.8           78.5        77.8
Ratio of earnings to fixed charges (c)......................         9.0         7.7        20.0           19.1        14.0

 
- ----------
(a)  Net investment income  is comprised of investment  income (net of expenses)
    and net realized investment gains.
(b) Earnings  per share  before  cumulative effects  of accounting  changes  was
    $3.96.  Effective January 1, 1993,  the Company adopted Financial Accounting
    Standard No. 106, "Employers'  Accounting for Postretirement Benefits  Other
    than  Pensions," which decreased  net income by $32.1  million, or $0.40 per
    share, and Financial  Accounting Standard  No. 109,  "Accounting for  Income
    Taxes," which increased net income by $20.0 million, or $0.25 per share.
(c)  For purposes of computing the ratio  of earnings to fixed charges, earnings
    as adjusted consist of income from continuing operations before income taxes
    plus fixed  charges.  Fixed charges  consist  of interest  expense  and  the
    estimated interest portion of rent expense.
 
                                       6

       SELECTED CONSOLIDATED SEGMENT INCOME STATEMENT DATA OF THE COMPANY
 


                                                                            YEAR ENDED DECEMBER 31,
                                                              ---------------------------------------------------
                                                                1995      1994      1993         1992      1991
                                                              --------  --------  --------     --------  --------
                                                                             (DOLLARS IN MILLIONS)
                                                                                          
Premiums and other income:
  Disability Insurance Segment..............................  $1,879.9  $1,716.2  $1,547.9     $1,339.8  $1,214.6
  Special Risk Insurance Segment............................     702.3     607.1     559.4        432.8     368.5
  Colonial Products Segment.................................     475.1     441.3     407.4        371.9     325.4
  Retirement Products Segment                                     34.1      31.4      42.5         52.5      64.4
  Corporate.................................................       0.1       0.8        --          0.8        --
                                                              --------  --------  --------     --------  --------
    Total premiums and other income.........................   3,091.5   2,796.8   2,557.2      2,197.8   1,972.9
                                                              --------  --------  --------     --------  --------
Net investment income: (a)
  Disability Insurance Segment..............................     592.9     400.3     369.8        370.5     333.8
  Special Risk Insurance Segment............................      48.4      40.7      34.8         32.2      26.5
  Colonial Products Segment.................................      52.2      32.6      41.4         35.4      38.5
  Retirement Products Segment...............................     323.7     338.0     387.6        408.7     411.3
  Corporate.................................................      14.2       4.2       6.2          3.9       1.5
                                                              --------  --------  --------     --------  --------
    Total net investment income.............................   1,031.4     815.8     839.8        850.7     811.6
                                                              --------  --------  --------     --------  --------
    Total revenues..........................................   4,122.9   3,612.6   3,397.0      3,048.5   2,784.5
                                                              --------  --------  --------     --------  --------
Benefits and expenses:
  Disability Insurance Segment..............................   2,255.8   2,060.3   1,603.6      1,446.6   1,306.4
  Special Risk Insurance Segment............................     690.4     581.9     555.3        418.7     355.2
  Colonial Products Segment.................................     439.6     411.2     378.4        346.8     306.4
  Retirement Products Segment                                    312.3     327.4     375.8        427.5     484.4
  Corporate.................................................      42.9      33.2      23.6         10.4      12.5
                                                              --------  --------  --------     --------  --------
    Total benefits and expenses.............................   3,741.0   3,414.0   2,936.7      2,650.0   2,464.9
                                                              --------  --------  --------     --------  --------
Income (loss) before income taxes and cumulative effects of
 accounting changes:
  Disability Insurance Segment..............................     217.0      56.2     314.1        263.7     242.0
  Special Risk Insurance Segment............................      60.3      65.9      38.9         46.3      39.8
  Colonial Products Segment.................................      87.7      62.7      70.4         60.5      57.5
  Retirement Products Segment...............................      45.5      42.0      54.3         33.7      (8.7)
  Corporate.................................................     (28.6)    (28.2)    (17.4)        (5.7)    (11.0)
                                                              --------  --------  --------     --------  --------
    Total income before income taxes and cumulative effects
     of accounting changes..................................     381.9     198.6     460.3        398.5     319.6
                                                              --------  --------  --------     --------  --------
Income taxes................................................     100.8      43.9     148.3        107.3      74.3
                                                              --------  --------  --------     --------  --------
Cumulative effects of accounting changes....................        --        --     (12.1)(b)       --        --
                                                              --------  --------  --------     --------  --------
    Net income..............................................  $  281.1  $  154.7  $  299.9     $  291.2  $  245.3
                                                              --------  --------  --------     --------  --------
                                                              --------  --------  --------     --------  --------

 
- ----------
(a)  Net investment income  is comprised of investment  income (net of expenses)
    and net realized investment gains.
 
(b) Effective January 1, 1993, the Company adopted Financial Accounting Standard
    No. 106,  "Employers'  Accounting  for Postretirement  Benefits  Other  than
    Pensions,"  which decreased net income by $32.1 million, or $0.40 per share,
    and Financial Accounting  Standard No. 109,  "Accounting for Income  Taxes,"
    which increased net income by $20.0 million, or $0.25 per share.
 
                                       7

                                USE OF PROCEEDS
 
    Except  as set forth in a Prospectus  Supplement, the Company intends to use
the net proceeds from the sale of the Securities for general corporate purposes,
including working  capital, capital  expenditures, investment  in  subsidiaries,
refinancing   of  debt,  possible  future  business  acquisitions  and  for  the
repurchase of its Common Stock. The Company does not have any present plans, and
is not engaged in  any negotiations, for  the use of any  such proceeds, or  the
issuance  of  Common  Stock, in  any  future  acquisition. Any  proposal  to use
proceeds from any offering of Securities in connection with an acquisition  will
be disclosed in the Prospectus Supplement relating to such offering.
 
                         DESCRIPTION OF DEBT SECURITIES
 
    The following description sets forth certain general terms and provisions of
the  Debt  Securities  to  which  any  Prospectus  Supplement  may  relate.  The
particular terms of the Debt Securities offered by any Prospectus Supplement and
the extent, if any, to which such  general provisions may not apply to the  Debt
Securities so offered will be described in the Prospectus Supplement relating to
such Debt Securities.
 
    The  Senior Debt Securities are to be issued under an Indenture, dated as of
September 15,  1990  (the "Senior  Indenture"),  between UNUM  Corporation  (for
purposes   of  this   "Description  of   Debt  Securities,"   exclusive  of  its
subsidiaries, the "Company") and The Chase Manhattan Bank, N.A., as trustee. The
Subordinated Debt Securities are to be  issued under a separate Indenture  dated
as  of May 1, 1995 (the "Subordinated Indenture") between the Company and Mellon
Bank, N.A., as trustee. The Senior Indenture and the Subordinated Indenture  are
sometimes  referred to  collectively as the  "Indentures." Copies  of the Senior
Indenture and the Subordinated Indenture are filed or incorporated by  reference
as  exhibits to the Registration  Statement of which this  Prospectus is a part.
The Chase Manhattan Bank, N.A. and Mellon Bank, N.A. are hereinafter referred to
as the "Trustee." The  following summaries of certain  provisions of the  Senior
Debt  Securities, the  Subordinated Debt  Securities and  the Indentures  do not
purport to be complete and are subject  to, and are qualified in their  entirety
by reference to, all the provisions of the Indentures applicable to a particular
series  of Debt Securities, including the  definitions therein of certain terms.
Wherever particular Sections, Articles  or defined terms  of the Indentures  are
referred to, such Sections, Articles or defined terms are incorporated herein by
reference.  Article and  Section references  used herein  are references  to the
applicable Indenture. Except  as otherwise  indicated, the terms  of the  Senior
Indenture  and the Subordinated  Indenture are identical.  Capitalized terms not
otherwise defined herein shall have the meaning given in the Indentures.
 
GENERAL
 
    The  Indentures  do  not  limit  the  aggregate  principal  amount  of  Debt
Securities  which may be issued thereunder and each Indenture provides that Debt
Securities may be issued thereunder from time to time in one or more series. The
Debt Securities will be unsecured. Unless otherwise specified in the  Prospectus
Supplement,  the  Senior  Debt  Securities when  issued  will  be unsubordinated
obligations of the  Company and  will rank equally  and ratably  with all  other
unsecured  and unsubordinated indebtedness of the Company. The Subordinated Debt
Securities when issued  will be subordinated  in right of  payment to the  prior
payment in full of all Senior Indebtedness (as defined below) of the Company, as
described  under  "Subordination of  Subordinated  Debt Securities"  and  in the
Prospectus Supplement applicable to an offering of Subordinated Debt Securities.
Since the Company is a holding company, the right of the Company, and hence  the
right of creditors of the Company (including the Holders of Debt Securities), to
participate  in  any  distribution of  the  assets  of any  subsidiary  upon its
liquidation or reorganization or otherwise  is necessarily subject to the  prior
claims  of creditors of the subsidiary, except  to the extent that claims of the
Company itself as a creditor of the subsidiary may be recognized.
 
    Reference is made to  the Prospectus Supplement  relating to the  particular
Debt Securities offered thereby (the "Offered Debt Securities") which sets forth
whether the Offered Debt Securities shall be
 
                                       8

Senior  Debt Securities or Subordinated Debt  Securities, and further sets forth
the following terms, where applicable, of  the Offered Debt Securities: (1)  the
title of the Offered Debt Securities; (2) any limit on their aggregate principal
amount;  (3) whether they  are to be  issuable in temporary  or permanent global
form; (4) the  price(s) (expressed as  a percentage of  the aggregate  principal
amount thereof) at which they will be issued; (5) the date(s) on which they will
mature;  (6) the rate(s) (which  may be fixed, floating  or adjustable) at which
they will bear  interest, if any,  and the  date from which  such interest  will
accrue;  (7) the dates  on which such  interest will be  payable and the Regular
Record Dates for  such Interest  Payment Dates;  (8) any  mandatory or  optional
sinking fund or analogous provisions; (9) any index or formula used to determine
the  amount of payments of principal of  and premium, if any, and interest; (10)
the date, if any, after which and  the price(s) at which the Company may  redeem
them  at  its  option;  (11) the  currency  or  currencies  (including composite
currencies) of payment of principal of and premium, if any, and interest thereon
if other  than U.S.  dollars  (the "Specified  Currency");  (12) the  terms  and
conditions,  if  any, pursuant  to which  the  Subordinated Debt  Securities are
convertible into  or  exchangeable  for  Common Stock  or  other  securities  or
property  of the Company;  (13) the Person  to whom any  interest on the Offered
Debt Securities will be  payable, if other  than the Person  in whose name  such
Offered  Debt Securities  are registered  on any  Regular Record  Date; (14) the
place or places where principal of (and  premium, if any) and interest, if  any,
on  Offered Debt Securities will be payable; (15) if other than denominations of
$1,000 and any integral multiple thereof, the denominations in which the Offered
Debt Securities will be issuable; (16) any event or events of default applicable
with respect to the Offered Debt Securities in addition to those provided in the
applicable Indenture;  (17) any  other  covenant or  warranty included  for  the
benefit  of the  Offered Debt  Securities in  addition to  (and not inconsistent
with) those  included  in the  applicable  Indenture  for the  benefit  of  Debt
Securities  of all series,  or any other  covenant or warranty  included for the
benefit of  the Offered  Debt Securities  in lieu  of any  covenant or  warranty
included  in the Indentures for the benefit  of Debt Securities of all series or
any provision that any covenant or warranty included in the applicable Indenture
for the benefit of Debt Securities of all series shall not be for the benefit of
the Offered Debt Securities, or any combination of such covenants, warranties or
provisions; and (18) any other terms. (Section 301) Debt Securities may also  be
issued  under the Indentures upon the  exercise of Warrants. See "Description of
Warrants."
 
    The Indentures do not contain any provisions that afford Holders of the Debt
Securities protection in the event of a highly leveraged or similar  transaction
involving the Company.
 
    Offered  Debt Securities  may be issued  at a substantial  discount to their
principal amount  (the "Original  Issue  Discount Securities").  Certain  United
States  Federal income tax and other considerations applicable to Original Issue
Discount Securities,  and to  Offered Debt  Securities that  are denominated  in
other  than  U.S.  dollars,  will  be  described  in  the  applicable Prospectus
Supplement.
 
    The Indentures provide  the Company  with the  ability, in  addition to  the
ability to issue Offered Debt Securities with terms different from those of Debt
Securities  previously issued, to "reopen" a previous  issue of a series of Debt
Securities and issue additional Offered Debt Securities of such series. (Section
301)
 
DENOMINATIONS, REGISTRATION AND TRANSFER
 
    Unless otherwise  provided  in  an  applicable  Prospectus  Supplement  with
respect  to  a  series  of  Offered  Debt  Securities,  Offered  Debt Securities
denominated in U.S. dollars  will be issued only  in denominations of $1,000  or
any  integral  multiple  thereof  without  coupons.  The  Prospectus  Supplement
relating to a  series of  Offered Debt Securities  denominated in  a foreign  or
composite currency will specify the denominations thereof. (Section 302) Offered
Debt  Securities  of any  series  will be  exchangeable  for other  Offered Debt
Securities of the same series containing identical terms and provisions and of a
like aggregate principal amount and containing identical terms and provisions of
different authorized denominations. (Section 305) Offered Debt Securities may be
issuable under the Indentures  in temporary or  permanent global form.  (Section
202) See "Global Securities."
 
                                       9

    Unless  otherwise  indicated  in an  applicable  Prospectus  Supplement, the
principal office of the Trustee  in The City of New  York will be designated  as
the  Company's Paying  Agent for payments  with respect to  Debt Securities. Any
other Paying Agents in the United States initially designated by the Company for
the Offered Debt Securities will be named in the related Prospectus  Supplement.
The  Company may at any  time designate additional Paying  Agents or rescind the
designation of any Paying Agents or approve a change in the office through which
any Paying Agent acts, except  that the Company will  be required to maintain  a
Paying  Agent in each Place  of Payment for such series.  All monies paid by the
Company to a Paying Agent for the  payment of principal of and premium, if  any,
and interest, if any, on any Debt Security which remains unclaimed at the end of
two  years after such principal,  premium or interest shall  have become due and
payable will be  repaid to  the Company,  and the  Holder of  such Offered  Debt
Security  will thereafter look only to the Company for payment thereof. (Section
1003)
 
GLOBAL SECURITIES
 
    If any Offered Debt Securities are issuable in temporary or permanent global
form, the applicable Prospectus Supplement  will describe the circumstances,  if
any,  under which  beneficial owners of  interests in any  such permanent global
Debt Security may exchange such interests for definitive Offered Debt Securities
of such series and of like tenor and principal amount in any authorized form and
denomination. Principal of and  any premium and interest  on a permanent  global
Debt  Security  will  be  payable  in the  manner  described  in  the applicable
Prospectus Supplement.
 
CERTAIN COVENANTS IN THE INDENTURES
 
    LIMITATIONS ON SALES OF RESTRICTED SUBSIDIARIES' CAPITAL STOCK.  The Company
will not sell, transfer or otherwise dispose of any shares of capital stock of a
Restricted Subsidiary  (other  than directors'  qualifying  shares or  sales  to
Restricted  Subsidiaries), and it  will not permit  any Restricted Subsidiary to
sell, transfer or otherwise dispose of any shares of capital stock of any  other
Restricted  Subsidiary (other than for directors'  qualifying shares or sales or
other transfers to the Company or to a Restricted Subsidiary), unless the entire
capital stock of such Restricted Subsidiary at the time owned by the Company and
its Restricted  Subsidiaries  shall  be disposed  of  at  the same  time  for  a
consideration consisting of cash or other property, which, in the opinion of the
Board  of Directors of the Company, is at least equal to the fair value thereof.
(Section 1006)
 
    For purposes of the Indentures,  "Restricted Subsidiary" means each of  UNUM
Life  Insurance  Company  of America,  First  UNUM Life  Insurance  Company, and
Colonial Companies, Inc., as well as any successor to all or a principal part of
the business of any such subsidiary, any subsidiary which owns or holds  capital
stock  of any such subsidiary and any other subsidiary which the Company's Board
of Directors designates as a Restricted Subsidiary. (Section 101) The Restricted
Subsidiaries accounted for approximately 90% of the consolidated revenues of the
Company during 1995  and approximately  91% of  the consolidated  assets of  the
Company at December 31, 1995.
 
LIMITATIONS ON LIENS ON RESTRICTED SUBSIDIARIES' CAPITAL STOCK.
 
    The  Company will not, and  it will not permit  any Restricted Subsidiary at
any time directly or  indirectly to, create, assume,  incur, or permit to  exist
any  indebtedness secured by a pledge, lien, or other encumbrance on the capital
stock of any  Restricted Subsidiary without  making effective provision  whereby
the  Debt Securities then outstanding (and, if  the Company so elects, any other
indebtedness ranking on a parity with the Debt Securities) shall be equally  and
ratably   secured  with  such  secured  indebtedness   so  long  as  such  other
indebtedness shall be secured. (Section 1007)
 
CONVERSION RIGHTS
 
    The  terms  on  which  Subordinated  Debt  Securities  of  any  series   are
convertible  into  or  exchangeable  for Common  Stock  or  other  securities or
property of the Company will be set forth in the Prospectus Supplement  relating
thereto.  Such  terms  shall  include provisions  as  to  whether  conversion or
exchange is mandatory,  at the  option of  the Holder or  at the  option of  the
Company, and may include provisions
 
                                       10

pursuant  to which the number  of shares of Common  Stock or other securities of
the Company to be received by the Holders of Subordinated Debt Securities  would
be  calculated according to the market price of Common Stock or other securities
of the Company as of a time stated in the Prospectus Supplement. The  conversion
price of any Subordinated Debt Securities of any series that is convertible into
Common  Stock of  the Company  may be  adjusted for  any stock  dividends, stock
splits, reclassification, combinations or similar transactions, as set forth  in
the applicable Prospectus Supplement. (Article Fourteen).
 
SUBORDINATION OF SUBORDINATED DEBT SECURITIES
 
    Unless  otherwise  indicated  in the  Prospectus  Supplement,  the following
provisions will apply to the Subordinated Debt Securities.
 
    The Subordinated  Debt Securities  will,  to the  extent  set forth  in  the
Subordinated  Indenture, be subordinate in right of payment to the prior payment
in full of all Senior Indebtedness.  Upon any payment or distribution of  assets
to  creditors  upon any  liquidation,  dissolution, winding  up, reorganization,
assignment  for  the  benefit  of  creditors,  marshalling  of  assets  or   any
bankruptcy,  insolvency, debt restructuring or similar proceedings in connection
with any insolvency  or bankruptcy  proceeding of  the Company,  the Holders  of
Senior  Indebtedness  will  first be  entitled  to  receive payment  in  full of
principal of  (and  premium,  if any)  and  interest,  if any,  on  such  Senior
Indebtedness  before the  Holders of  the Subordinated  Debt Securities  will be
entitled to receive or retain  any payment in respect  of the principal of  (and
premium,  if  any) or  interest, if  any, on  the Subordinated  Debt Securities.
(Section 1302)
 
    By reason of such subordination, in the event of liquidation or  insolvency,
creditors  of  the Company  may recover  less, ratably,  than Holders  of Senior
Indebtedness and may recover more, ratably, than the Holders of the Subordinated
Debt Securities.
 
    In the event of  the acceleration of the  maturity of any Subordinated  Debt
Securities,  the Holders of  all Senior Indebtedness outstanding  at the time of
such acceleration  will first  be entitled  to receive  payment in  full of  all
amounts  due thereon before the Holders of the Subordinated Debt Securities will
be entitled to receive any payment upon the principal of (or premium, if any) or
interest, if any, on the Subordinated Debt Securities. (Section 1303)
 
    No payments on  account of principal  (or premium, if  any) or interest,  if
any,  in respect of the Subordinated Debt  Securities may be made if there shall
have occurred and be continuing a default in any payment with respect to  Senior
Indebtedness,  or an  event of default  with respect to  any Senior Indebtedness
resulting in  the acceleration  of  the maturity  thereof,  or if  any  judicial
proceeding shall be pending with respect to any such default. (Section 1304) For
purposes  of the subordination provisions, the payment, issuance and delivery of
cash,  property  or  securities  (other  than  stock  and  certain  subordinated
securities  of the Company) upon conversion of a Subordinated Debt Security will
be deemed to constitute payment on account of the principal of such Subordinated
Debt Security.
 
    The Subordinated  Indenture does  not limit  or prohibit  the incurrence  of
additional Senior Indebtedness, which may include indebtedness that is senior to
the  Subordinated Debt Securities,  but subordinate to  other obligations of the
Company. The Senior  Debt Securities  constitute Senior  Indebtedness under  the
Subordinated Indenture.
 
    "Senior  Indebtedness"  is  defined  to  include  all  amounts  due  on  and
obligations in connection with any of the following, whether outstanding at  the
date  of  execution  of the  Subordinated  Indenture or  thereafter  incurred or
created:
 
    (a)  indebtedness,  obligations   and  other   liabilities  (contingent   or
otherwise) of the Company for money borrowed, or evidenced by bonds, debentures,
notes or similar instruments;
 
                                       11

    (b)   reimbursement  obligations   and  other   liabilities  (contingent  or
otherwise)  of  the  Company  with  respect  to  letters  of  credit,   bankers'
acceptances  issued for the account  of the Company or  with respect to interest
rate protection agreements or currency exchange or purchase agreements;
 
    (c) obligations  and liabilities  (contingent or  otherwise) in  respect  of
leases  by the  Company as lessee  which, in conformity  with generally accepted
accounting principles, are accounted for as capitalized lease obligations on the
balance sheet of the Company;
 
    (d) all direct or indirect guarantees  or similar agreements in respect  of,
and  obligations  or  liabilities  (contingent  or  otherwise)  to  purchase  or
otherwise acquire or otherwise to assure a creditor against loss of the  Company
in  respect  of,  indebtedness,  obligations or  liabilities  of  another Person
described in clauses (a) through (c);
 
    (e) any indebtedness  described in clauses  (a) through (d)  secured by  any
mortgage,  pledge, lien or other encumbrance existing on property which is owned
or held by the Company, regardless  of whether the indebtedness secured  thereby
shall have been assumed by the Company; and
 
    (f)  any  and  all deferrals,  renewals,  extensions and  refundings  of, or
amendments, modifications  or supplements  to, any  indebtedness, obligation  or
liability  of the kind described in clauses  (a) through (e); unless in any case
in  the  instrument  creating  or  evidencing  such  indebtedness,   obligation,
liability,  guaranty, assumption, deferral, renewal,  extension or refunding, it
is provided that such indebtedness, obligation, liability, guaranty, assumption,
deferral, renewal, extension  or refunding involved  is not senior  in right  of
payment  to the Subordinated  Debt Securities or that  such indebtedness is PARI
PASSU with or junior to the Subordinated Debt Securities. (Section 101)
 
    The Prospectus  Supplement  may further  describe  the provisions,  if  any,
applicable  to  the  subordination  of the  Subordinated  Debt  Securities  of a
particular series.
 
CONSOLIDATION, MERGER AND SALE OF ASSETS
 
    The Company,  without  the  consent  of  any  Holders  of  Outstanding  Debt
Securities,  may consolidate or  merge with or  into any Person,  or transfer or
lease its assets substantially as an entirety  to any Person, or may acquire  or
lease  the assets of any Person, provided that: (a) the successor formed by such
consolidation or into which  the Company is merged  or which acquires or  leases
the  assets of the Company  substantially as an entirety  is organized under the
laws of any United States jurisdiction and assumes the Company's obligations  on
the  Debt Securities and under the applicable Indenture; (b) after giving effect
to the transaction, 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; and (c) certain other conditions are met. (Article Eight)
 
EVENTS OF DEFAULT
 
    Under  the Indentures, the following will  be Events of Default with respect
to Debt  Securities of  a particular  series: (a)  the Company  defaults in  the
payment of interest on any Debt Security of that series when due and payable and
the  Default continues for a period of 30  days; (b) the Company defaults in the
payment of any principal of  and premium, if any, on  any Debt Security of  that
series when due and payable at maturity, upon redemption or otherwise, or in the
deposit  of any sinking fund payment when due by the terms of a Debt Security of
that series; (c) the Company  fails to comply with or  perform any of its  other
agreements, covenants or warranties in the Debt Securities of that series or the
Indenture in respect of Debt Securities of that series and the Default continues
for  60 days after written  notice as provided in  the applicable Indenture; (d)
there shall be a default by the  Company or any Restricted Subsidiary under  any
(i)  debt for money borrowed (including Debt Securities of any series other than
that series), (ii) mortgage, indenture or other instrument under which there may
be issued or may  be secured or evidenced  any indebtedness for money  borrowed,
(iii)  guarantee of payment for money borrowed  or (iv) debt evidenced by bonds,
debentures, notes or other similar instruments (excluding trade accounts payable
or accrued liabilities arising  in the normal course  of business which are  not
overdue by more
 
                                       12

than  90 days or which are being contested in good faith) and such default shall
result in such indebtedness becoming due prior to its stated maturity; PROVIDED,
HOWEVER, a default shall exist under this  clause (d) only if all such  defaults
relate  to  such indebtedness  or such  guarantees  with an  aggregate principal
amount in excess of $5,000,000, the acceleration of which has not been rescinded
or annulled within 10  days after written notice  as provided in the  applicable
Indenture; (e) certain events of bankruptcy, insolvency or reorganization of the
Company  or  any  Restricted Subsidiary;  and  (f)  any other  Event  of Default
provided with  respect to  Debt Securities  of that  series. (Section  501)  The
applicable  Trustee or the  Holders of at  least 25% in  principal amount of the
Outstanding Debt Securities  of that series  (each series acting  as a  separate
class)  may declare all unpaid principal of and accrued interest (or such lesser
amount as may be provided for in the Debt Securities of that series) on all then
Outstanding Debt Securities of that series to be due and payable immediately  if
an  Event  of  Default  (other than  one  in  (e) above)  with  respect  to Debt
Securities of  such  series  shall  occur  and be  continuing  at  the  time  of
declaration. If an Event of Default as specified in (e) above occurs, all unpaid
principal  and accrued interest (or such lesser amount as may be provided for in
the Debt Securities of that series)  shall IPSO FACTO become and be  immediately
due  and payable without any other declaration or act on the part of the Trustee
or any Holder. (Section 502)
 
    At any time after a declaration  of acceleration has been made with  respect
to  Debt Securities of any series, the Holders of a majority in principal amount
of the Outstanding Debt Securities of that series may rescind any declaration of
acceleration with  respect  to  the  Debt Securities  of  that  series  and  its
consequences,  (a) if  the rescission  would not  conflict with  any judgment or
decree; (b) if all existing Events  of Defaults with respect to Debt  Securities
of  that series  have been  cured or waived  except non-payment  of principal or
interest on Debt Securities of that series that has become due solely because of
the acceleration; and (c) to the extent that payment of such interest is lawful,
interest upon overdue interest at the rate or rates prescribed therefore in such
Debt Securities has been paid. (Section  502) Any Event of Default with  respect
to  Debt Securities of any series may be  waived by the Holders of a majority in
principal amount of the Outstanding Debt Securities of that series, except in  a
case  of failure to pay principal or premium, if any, or interest on, or deposit
of any sinking fund payment  with respect to, any  Debt Security of that  series
for  which payment or deposit had not been  subsequently made or in respect of a
covenant or provision which cannot be modified or amended without the consent of
the Holder of each Outstanding Debt  Security of such series affected.  (Section
504)
 
    If any event which is, or after notice or lapse of time or both would become
an  Event of Default (a "Default") occurs with respect to Debt Securities of any
series and it  is known to  the applicable  Trustee, the Trustee  shall mail  to
Holders  of Debt Securities  of that series  a notice of  Default within 90 days
after it occurs unless  such Default shall have  been cured or waived,  PROVIDED
that  except in  the case of  a Default  in the payment  of the  principal of or
premium, if any,  or interest  on, any  Debt Security of  any series  or in  the
making  of any sinking fund  payment payable with respect  to Debt Securities of
any series, the Trustee may withhold the notice  if and so long as the board  of
directors,  the  executive  committee  or  a  trust  committee  of  directors or
Responsible Officers of the  Trustee in good  faith determines that  withholding
the  notice is in the interests of Holders of Debt Securities of that series and
PROVIDED, FURTHER, that in the case of any Default of the character specified in
clause (c) under  "Events of  Default" with respect  to Debt  Securities of  any
series,  no notice to  Holders shall be given  until at least  30 days after the
occurrence thereof. (Section 602)
 
    Reference is made  to the Prospectus  Supplement relating to  any series  of
Debt  Securities which are Original Issue Discount Securities for the particular
provisions relating  to the  principal amount  of such  Original Issue  Discount
Securities  due upon the occurrence of any Event of Default and the continuation
thereof.
 
    The Holders  of a  majority  in principal  amount  of the  Outstanding  Debt
Securities  of a series may direct the  time, method and place of conducting any
proceeding for any remedy  available to the Trustee  or exercising any trust  or
power  conferred on the Trustee with respect  to Debt Securities of such series,
 
                                       13

PROVIDED that the Trustee may refuse to follow any directions that conflict with
any law or the Indenture, are unduly prejudicial to the rights of other  Holders
of  that series,  or would involve  the Trustee in  personal liability. (Section
505)
 
    In case an Event of Default shall occur and be continuing, the Trustee shall
exercise such of its  rights and powers under  the applicable Indenture and  use
the  same degree of care  and skill in their exercise  as a prudent person would
exercise or  use under  the circumstances  in the  conduct of  his own  affairs.
(Section  601)  Before  proceeding to  exercise  any  right or  power  under the
applicable Indenture  at the  direction of  such Holders,  the Trustee  will  be
entitled  to receive from such Holders  security or indemnity satisfactory to it
against the costs,  expenses and liabilities  which might be  incurred by it  in
complying with any such direction. (Section 603)
 
MODIFICATION AND WAIVER
 
    With  certain exceptions, modification or amendment of the Indentures or the
rights of Holders of the  Debt Securities of any series  may be effected by  the
Company  and the Trustee with the consent of  the Holders of at least 66 2/3% in
principal amount  of the  Outstanding Debt  Securities of  each series  affected
thereby,  PROVIDED  that  no such  modification  or amendment  may,  without the
written consent  of  the  Holder  of each  Outstanding  Debt  Security  affected
thereby,  (a) change the Stated Maturity of the principal of, or any installment
of principal of,  or interest on,  any Debt Security;  (b) reduce the  principal
amount of, or the interest on, any Debt Security or any premium payable upon the
redemption  thereof  or reduce  the  amount of  principal  of an  Original Issue
Discount Security which could be declared due and payable upon an  acceleration;
(c) change the Place of Payment or coin or currency of any payment of principal,
any  premium or interest on any Debt Security; (d) impair the right to institute
suit for the enforcement of any payment on or with respect to any Debt Security;
(e) reduce the percentage in principal amount of the Outstanding Debt Securities
of any  series,  the  consent  of  whose Holders  is  required  to  approve  any
supplemental  indenture,  to waive  compliance  with certain  provisions  of the
applicable Indenture or certain defaults  thereunder and their consequences,  or
to  reduce quorum or voting requirements  applicable to meetings of Holders; (f)
in the  case of  Subordinated Debt  Securities, adversely  change the  right  to
convert  or exchange, including decreasing the conversion rate or increasing the
conversion price of such  Subordinated Debt Securities; (g)  in the case of  the
Subordinated  Indenture, modify the subordination provisions in a manner adverse
to the Holders of any Subordinated Debt Securities; or (h) modify the  foregoing
requirements  in (a) through (g) above, requiring  the consent of each Holder of
each Outstanding  Debt Security  affected  thereby, or  the percentage  of  such
Holders  required to waive past defaults, or the percentage of such Holders that
may rescind an acceleration, except to increase any such percentage, and  except
to  provide that other provisions of the Indentures cannot be modified or waived
without the consent  of the Holder  of each Outstanding  Debt Security  affected
thereby.  (Section 902) Except  with respect to  certain fundamental provisions,
the Holders  of at  least a  majority in  principal amount  of Outstanding  Debt
Securities  of any series may, with respect  to such series, waive past defaults
under the Indentures and waive compliance by the Company with certain provisions
of the Indentures. (Section 513)
 
SATISFACTION AND DISCHARGE OF INDENTURES
 
    The Indentures generally provide that  the Company may terminate certain  of
its obligations under the Debt Securities of any series and under the Indentures
(with  respect to  such series) if  (i) all  the Debt Securities  of such series
previously authenticated and  delivered (other  than lost,  destroyed or  stolen
Debt  Securities that have been replaced or  paid or for whose payment money has
been deposited in trust) have been delivered to the Trustee for cancellation and
the Company  has  paid  all  sums  payable by  it  thereunder,  (ii)  such  Debt
Securities  of such series have matured or will mature within one year or all of
them are  to  be  called  for redemption  within  one  year  under  arrangements
satisfactory  to the Trustee for giving the notice of redemption and the Company
irrevocably deposits  with  the Trustee  money  or U.S.  Government  Obligations
sufficient to pay principal of, premium, if any, and interest on the Outstanding
Debt  Securities of such series that are  due or will become due upon redemption
or maturity, as the case
 
                                       14

may be,  and to  pay all  other  sums payable  by it  thereunder or  (iii)  upon
compliance  with certain conditions specified in  the Indentures, 123 days after
the Company  makes the  deposit with  the Trustee  of money  or U.S.  Government
Obligations  specified  in  clause  (ii).  In such  case,  Holders  of  the Debt
Securities must look to the deposited money for payment. (Section 401)
 
    The Indentures further  provide that if  the Company has  made the  election
provided  by  clause (iii)  above, it  may elect  either (a)  to defease  and be
discharged from any and all obligations  with respect to the Debt Securities  of
such  series, except for the obligations to register the transfer or exchange of
such Debt  Securities, to  replace temporary  or mutilated,  destroyed, lost  or
stolen  Debt Securities, to maintain an office  or agency in respect of the Debt
Securities, and to hold moneys for payment in trust ("legal defeasance") or  (b)
to  be released from its obligations with respect to the Debt Securities of such
series under the covenant  default (except with respect  to the covenant to  pay
principal  and  interest)  and cross-acceleration  provisions  under  "Events of
Default" and  from the  restrictions described  under certain  covenants in  the
Indentures,  including "Limitations on Sales of Restricted Subsidiaries' Capital
Stock" and "Limitations  on Liens  on Restricted  Subsidiaries' Capital  Stock,"
and, in the case of Subordinated Debt Securities, the provisions described under
"Subordination  of Subordinated  Debt Securities" ("covenant  defeasance"). As a
condition to legal defeasance or  covenant defeasance, the Company must  deliver
to  the Trustee an  opinion of counsel  (as specified in  the Indentures) to the
effect that the Holders of the Debt Securities of such series will not recognize
income, gain or loss for United States  Federal income tax purposes as a  result
of  such legal defeasance or  covenant defeasance and will  be subject to United
States Federal income tax  on the same  amounts, in the same  manner and at  the
same  times as  would have been  the case  if such legal  defeasance or covenant
defeasance had not occurred. In the case of legal defeasance under clause (a) or
covenant defeasance under  clause (b) above,  a ruling of  the Internal  Revenue
Service may be delivered in lieu of such opinion. (Section 401)
 
    Under  current United States Federal income  tax law, legal defeasance would
likely be treated as a taxable exchange of such Debt Securities for interests in
the defeasance trust. As  a consequence, a Holder  would recognize gain or  loss
equal  to the difference between the Holder's tax basis for such Debt Securities
and the value of the Holder's  interest in the defeasance trust, and  thereafter
would be required to include in income its share of the income, gain and loss of
the  defeasance trust. Under current Federal income tax law, covenant defeasance
would likely  not be  treated as  a taxable  exchange of  such Debt  Securities.
Purchasers  of  such  Debt Securities  should  consult their  tax  advisors with
respect to the more particular tax consequences to them of such legal defeasance
and covenant defeasance, including the applicability and effect of United States
Federal income and other tax law.
 
    The Company may  exercise its legal  defeasance option with  respect to  the
Debt  Securities  of  such series,  notwithstanding  its prior  exercise  of its
covenant defeasance  option.  If  the Company  exercises  its  legal  defeasance
option,  payment of such  Debt Securities may  not be accelerated  because of an
Event of  Default. If  the  Company exercises  its covenant  defeasance  option,
payment  of such Debt Securities may not  be accelerated because of the covenant
default (except with respect to the covenant to pay principal and interest)  and
cross-acceleration provisions or certain of the covenants, including those noted
under  clause (b) above. However, if such  an acceleration were to occur because
of other defaults, the  realizable value at the  acceleration date of the  money
and  U.S. Government Obligations in the defeasance  trust could be less than the
principal and interest then  due on such Debt  Securities, because the  required
deposit  in the defeasance trust is based  upon scheduled cash flows rather than
market value, which will vary depending  upon interest rates and other  factors.
(Section 401)
 
    The term "U.S. Government Obligations" is defined to mean direct obligations
of  the United  States for  the payment of  which its  full faith  and credit is
pledged, or obligations of a person controlled or supervised by and acting as an
agency or  instrumentality of  the United  States and  the payment  of which  is
unconditionally  guaranteed as a full faith  and credit obligation by the United
States which, in either case,  are not callable or  redeemable at the option  of
the issuer thereof, and shall also include a depositary receipt issued by a bank
(as  defined  in  Section  3(a)(2)  of the  Securities  Act)  as  custodian with
 
                                       15

respect to  any  such U.S.  Government  Obligations  or a  specific  payment  of
principal  of or interest on  any such U.S. Government  Obligations held by such
custodian for the  account of the  holder of such  depositary receipt,  PROVIDED
that  (except as required by  law) such custodian is  not authorized to make any
deduction from the amount payable to the holder of such depositary receipt  from
any  amount  received  by  the  custodian  in  respect  of  the  U.S. Government
Obligations or the  specific payment  of principal of  or interest  on the  U.S.
Government Obligations evidenced by such depositary receipt. (Section 101)
 
CONCERNING THE TRUSTEES
 
    The  Company  maintains  banking  relationships in  the  ordinary  course of
business with The Chase Manhattan Bank, N.A. and Mellon Bank, N.A. In  addition,
Mellon  Bank,  N.A. is  a participant  in the  Company's $500  million revolving
credit facility entered into as of December 13, 1994.
 
                          DESCRIPTION OF CAPITAL STOCK
 
    The following descriptions and the descriptions contained in "Description of
Preferred Stock" and "Description of Common Stock" are summaries, and  reference
is  herein made to the detailed provisions of the following documents, copies of
which are filed  as exhibits to  the Registration Statement:  (i) the  Company's
Certificate  of Incorporation, as amended  (the "Certificate of Incorporation");
(ii) the  Company's By-Laws  (the  "By-Laws"); and  (iii) the  Rights  Agreement
between the Company and First Chicago Trust Company of New York, as Rights Agent
(the  "Rights  Agreement"), pursuant  to  which shares  of  Junior Participating
Preferred Stock, Series A ("Junior Participating Preferred Stock") are issuable.
 
    The authorized capital  stock of  the Company consists  of: (i)  120,000,000
shares of Common Stock, par value $0.10 per share, and (ii) 10,000,000 shares of
Preferred Stock, par value $0.10 per share, of which 1,000,000 are designated as
Junior Participating Preferred Stock.
 
    As  of  March 31,  1996, there  were outstanding:  (a) 73,274,752  shares of
Common Stock (as well as the same number of rights to purchase shares of  Junior
Participating  Preferred  Stock,  pursuant  to  the  Rights  Agreement)  and (b)
employee stock options to  purchase an aggregate of  5,835,464 shares of  Common
Stock.
 
                         DESCRIPTION OF PREFERRED STOCK
 
    The following description sets forth certain general terms and provisions of
the Preferred Stock to which any Prospectus Supplement may relate. Certain other
terms  of  a particular  series  of Preferred  Stock  will be  described  in the
Prospectus Supplement relating to that series. If so indicated in the Prospectus
Supplement, the terms of  any such series  may differ from  the terms set  forth
below.  The description of  certain provisions of the  Preferred Stock set forth
below and in any Prospectus  Supplement does not purport  to be complete and  is
subject  to  and  qualified  in  its  entirety  by  reference  to  the Company's
Certificate of Incorporation and the certificate of designation relating to each
such series  of Preferred  Stock, which  will be  filed with  the Commission  in
connection with the offering of such series of Preferred Stock.
 
GENERAL
 
    Under  the Company's Certificate of Incorporation, the Board of Directors is
authorized to fix and determine the  terms, limitations and relative rights  and
preferences  of any class of preferred stock, including, without limitation, any
voting rights thereof, to divide and issue any of the classes of preferred stock
in series, and to fix  and determine the variations  among series to the  extent
permitted  by  law.  The  Company  has  authorized  1,000,000  shares  of Junior
Participating Preferred Stock for issuance upon
 
                                       16

exercise of certain preferred share  purchase rights associated with each  share
of   outstanding  Common  Stock  as  provided   in  the  Rights  Agreement.  See
"Description of Common Stock--Share Purchase Rights Plan,--Description of Junior
Participating Preferred Stock."
 
    The Preferred Stock  shall have  the dividend,  liquidation, redemption  and
voting  rights  set  forth below  unless  otherwise provided  in  the Prospectus
Supplement relating to a particular series of Preferred Stock. Reference is made
to the Prospectus Supplement relating to a particular series of Preferred  Stock
offered thereby for specific terms including: (1) the designation and the number
of  shares offered; (2) the amount of  liquidation preference per share; (3) the
price at which such Preferred  Stock will be issued;  (4) the dividend rate  (or
method  of calculation), the  dates on which dividends  will be payable, whether
such dividends will be cumulative or noncumulative and, if cumulative, the dates
from which dividends will  commence to cumulate; (5)  any redemption or  sinking
fund  provisions; (6) any conversion or  exchange rights; and (7) any additional
voting, dividend,  liquidation,  redemption,  sinking  fund  and  other  rights,
preferences, privileges, limitations and restrictions.
 
    The Preferred Stock offered hereby will be issued in one or more series. The
holders  of  Preferred  Stock will  have  no  preemptive rights.  Any  shares of
Preferred Stock  sold  hereunder  will  be fully  paid  and  nonassessable  upon
issuance  against full payment of the  purchase price therefor. Unless otherwise
specified in  the  Prospectus Supplement  relating  to a  particular  series  of
Preferred  Stock, each  series of Preferred  Stock will  rank on a  parity as to
dividends and  liquidation rights  in all  respects with  each other  series  of
Preferred Stock (other than the Junior Participating Preferred Stock).
 
DIVIDEND RIGHTS
 
    Holders  of the Preferred Stock of each  series 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.  Different series of the Preferred Stock  may be entitled to dividends at
different rates or based upon different methods of determination. Such rate  may
be  fixed or variable or both. Each such dividend will be payable to the holders
of record as they appear on the stock books of the Company on such record  dates
as  will be fixed by the Board of  Directors of the Company or a duly authorized
committee thereof.  Dividends  on any  series  of  the Preferred  Stock  may  be
cumulative  or noncumulative, as provided  in the Prospectus Supplement relating
thereto.
 
RIGHTS UPON LIQUIDATION
 
    In the event  of any  voluntary or involuntary  liquidation, dissolution  or
winding up of the Company, the holders of each series of Preferred Stock will be
entitled  to receive out of assets of  the Company available for distribution to
stockholders, before any  distribution of assets  is made to  holders of  Common
Stock or any other class of stock ranking junior to such series of the Preferred
Stock upon liquidation, liquidating distributions in the amount set forth in the
Prospectus  Supplement relating to such series of Preferred Stock plus an amount
equal to accrued and unpaid dividends for the then current dividend period  and,
if  such series of the  Preferred Stock is cumulative,  for all dividend periods
prior thereto, all  as set forth  in the Prospectus  Supplement with respect  to
such shares.
 
REDEMPTION
 
    The  terms, if any,  on which shares of  a series of  Preferred Stock may be
subject to optional or mandatory  redemption, in whole or  in part, will be  set
forth in the Prospectus Supplement relating to such series.
 
CONVERSION
 
    The  terms, if  any, on which  shares of  any series of  Preferred Stock are
convertible into Common  Stock will be  set forth in  the Prospectus  Supplement
relating thereto. Such terms may include provisions
 
                                       17

for  conversion, either mandatory, at the option of the holder, or at the option
of the  Company, in  which case  the  number of  shares of  Common Stock  to  be
received  by the holders of Preferred Stock would be calculated as of a time and
in the manner stated in the Prospectus Supplement.
 
TRANSFER AGENT AND REGISTRAR
 
    The transfer  agent,  registrar  and dividend  disbursement  agent  for  the
Preferred  Stock will be designated in the applicable Prospectus Supplement. The
registrar for shares of Preferred Stock will send notices to shareholders of any
meetings at  which  holders of  the  Preferred Stock  have  the right  to  elect
directors of the Company or to vote on any other matter.
 
VOTING RIGHTS
 
    The  holders  of Preferred  Stock of  a  series offered  hereby will  not be
entitled to vote except  as indicated in the  Prospectus Supplement relating  to
such series of Preferred Stock or as required by applicable law.
 
                          DESCRIPTION OF COMMON STOCK
 
GENERAL
 
    Subject  to  the  rights of  the  holders  of any  shares  of  the Company's
Preferred Stock which may  at the time be  outstanding, holders of Common  Stock
are  entitled to  such dividends as  the Board  of Directors may  declare out of
funds legally  available therefor.  The  holders of  Common Stock  will  possess
exclusive  voting  rights in  the Company,  except  to the  extent the  Board of
Directors specifies voting  power with  respect to any  Preferred Stock  issued.
Except  as hereinafter  described, holders of  Common Stock are  entitled to one
vote for each share  of Common Stock,  but will not have  any right to  cumulate
votes  in the election of directors. In the event of liquidation, dissolution or
winding up of the Company, the holders of Common Stock are entitled to  receive,
after  payment of all of the Company's debts  and liabilities and of all sums to
which holders of any  Preferred Stock may be  entitled, the distribution of  any
remaining  assets  of the  Company.  Holders of  the  Common Stock  will  not be
entitled to preemptive rights  with respect to any  shares which may be  issued.
Any  shares of Common Stock sold hereunder will be fully paid and non-assessable
upon issuance against full payment of the purchase price therefor. First Chicago
Trust Company of New York is the transfer agent for the Common Stock. The Common
Stock is listed on the  New York Stock Exchange  and the Pacific Stock  Exchange
under the symbol "UNM."
 
CERTAIN PROVISIONS
 
    The  provisions of  the Company's  Certificate of  Incorporation and By-Laws
which are summarized below may be deemed to have an anti-takeover effect and may
delay, defer or prevent  a tender offer or  takeover attempt that a  stockholder
might  consider in  such stockholder's  best interest,  including those attempts
that might result  in a premium  over the market  price for the  shares held  by
stockholders.
 
    CLASSIFIED BOARD.  The Board of Directors is divided into three classes that
are  elected for staggered  three-year terms. A  director may be  removed by the
stockholders, but  only for  cause, and  only  by the  affirmative vote  of  the
holders,  voting as a single class, of 80%  or more of the total number of votes
entitled to be cast by all holders  of the voting stock which shall include  all
capital  stock  of  the Company  which  by its  terms  may vote  on  all matters
submitted to stockholders of the Company generally.
 
    ISSUANCE OF PREFERRED STOCK.  Pursuant to the Certificate of  Incorporation,
the  Board  of Directors  by  resolution may  establish  one or  more  series of
Preferred Stock  having  such number  of  shares, designation,  relative  voting
rights,   dividend  rates,   liquidation  and  other   rights,  preferences  and
limitations as  may be  fixed by  the  Board of  Directors without  any  further
stockholder  approval. Such  rights, preferences, privileges  and limitations as
may be  established  could have  the  effect  of impeding  or  discouraging  the
acquisition of control of the Company.
 
                                       18

    BUSINESS  COMBINATIONS.  In  addition, the Certificate  of Incorporation and
By-Laws of the Company contain  supermajority voting provisions relating to  the
approval  of business  combinations with  certain stockholders.  Pursuant to the
Company's Certificate  of Incorporation,  any Business  Combination (as  defined
therein,  which term  includes a  merger, sale of  all or  substantially all its
assets, the  adoption  of  a  plan  of  liquidation  and  similar  extraordinary
corporate  transactions)  with  (i)  any person  (other  than  the  Company, its
subsidiaries, certain employee benefit plans of the Company and the trustees  of
such  plans) who is the beneficial owner of 10% or more of the UNUM Voting Stock
(as defined below)  or (ii)  any person  who is  an Affiliate  or Associate  (as
defined  in Rule  12b-2 of  the Exchange  Act) of  the Company  and who  was the
beneficial owner of 10% or more of the UNUM Voting Stock at any time in the  two
years  prior  to the  date in  question  (each such  person, a  "UNUM Interested
Stockholder") must  be approved  by a  supermajority vote,  unless the  Business
Combination  has  been approved  by the  vote  of a  majority of  the Continuing
Directors (as defined below) of the  Company's Board of Directors. "UNUM  Voting
Stock" means all capital stock of the Company which by its terms may vote on all
matters   submitted  to  stockholders  of  the  Company  generally.  "Continuing
Director" means any Board of  Directors member who while  serving as a Board  of
Directors  member is not an Affiliate or Associate or representative of the UNUM
Interested Stockholder and who was a  Board of Directors member before the  UNUM
Interested Stockholder became such and includes certain successors to such Board
of   Directors  members.  The  required   supermajority  vote  consists  of  the
affirmative vote of the  holders of (i)  80% or more of  the UNUM Voting  Stock,
voting together as a single class, and (ii) at least a majority of the shares of
UNUM  Voting Stock not held by  the UNUM Interested Stockholder, voting together
as a single class.
 
    AMENDMENTS TO THE CERTIFICATE  OF INCORPORATION.   Under the Certificate  of
Incorporation,  the  amendment  of,  repeal  of  or  adoption  of  any provision
inconsistent  with  certain  provisions  of  the  Certificate  of  Incorporation
relating  to (i) the election of the  Board of Directors, its powers and related
matters requires the  affirmative vote of  the holders  of at least  80% of  the
outstanding  UNUM  Voting Stock,  voting together  as a  single class,  and (ii)
Business Combinations with UNUM Interested  Stockholders and the required  votes
for amendments of the Certificate of Incorporation requires the affirmative vote
of  the holders specified  in clause (i)  above and the  affirmative vote of the
holders of at least a majority of the outstanding UNUM Voting Stock which is not
beneficially owned  by any  UNUM Interested  Stockholder, voting  together as  a
single  class. The above  supermajority voting requirements do  not apply to any
amendment, repeal  or adoption  recommended by  the Board  of Directors  of  the
Company  if a majority of  the Board of Directors of  the Company then in office
consists of persons who would be eligible to serve as Continuing Directors.
 
    AMENDMENTS TO THE BY-LAWS.   The Certificate of Incorporation provides  that
the  By-Laws may be amended  by the affirmative vote  of a majority of directors
present at a meeting of the Board of  Directors at which a quorum is present  or
by  the affirmative vote of the holders of  at least 80% of all outstanding UNUM
Voting Stock, voting together as a single class.
 
    STOCKHOLDER PROPOSAL PROCEDURES.   The By-Laws  require any stockholder  who
wants  to present a proposal for action by the stockholders at an annual meeting
to deliver a written  notice to the  Secretary of the Company.  To be timely,  a
stockholder's  notice  must be  delivered  to, or  mailed  and received  at, the
principal executive offices of the Company, not less than 60 days nor more  than
90  days prior  to the  date of the  annual meeting,  unless less  than 75 days'
notice or prior public disclosure of the date of such meeting has been given  or
made  to the stockholders, in which case a stockholder's notice must be received
no later than the close of business on  the 15th day following the day on  which
such notice was mailed or such disclosure was made.
 
SHARE PURCHASE RIGHTS PLAN
 
    On  March  13,  1992,  the  Board of  Directors  of  the  Company  adopted a
stockholder rights plan  and declared a  dividend distribution of  one right  (a
"Right") for each outstanding share of Common Stock to
 
                                       19

stockholders  of record at the  close of business on  March 23, 1992. Each Right
entitles the registered holder to purchase from the Company a unit consisting of
one one-hundredth of a share (a "Unit") of Junior Participating Preferred Stock,
at a  purchase price  of $150  per Unit,  subject to  adjustment (the  "Purchase
Price"). The terms of the Junior Participating Preferred Stock are such that one
Unit is essentially equivalent to one share of Common Stock. The description and
terms  of the Rights are set forth in  a Rights Agreement, dated as of March 13,
1992 and  amended as  of June  19, 1996  (as amended,  the "Rights  Agreement"),
between the Company and First Chicago Trust Company of New York, as rights agent
(the "Rights Agent").
 
    Initially,   the  Rights  are  attached  to  all  outstanding  Common  Stock
certificates,  and   no  separate   certificates  evidencing   Rights   ("Rights
Certificates")  are distributed. The Rights will  separate from the Common Stock
and a "Distribution  Date" will  occur upon  the earlier  of (i)  ten (10)  days
following  a  public  announcement  that  a person  or  group  of  affiliated or
associated persons (an "Acquiring Person")  has acquired, or obtained the  right
to  acquire, beneficial ownership  of 10% or  more of the  outstanding shares of
Common Stock, except for persons or a group of affiliated or associated  persons
who  become the  beneficial owner of  10% or  more of the  outstanding shares of
Common Stock solely as a result of a reduction in the number of shares of Common
Stock outstanding  due to  a repurchase  of shares  by the  Company unless  such
person or group thereafter acquires additional shares representing 1% or more of
the  outstanding Common  Stock (the "Stock  Acquisition Date") or  (ii) ten (10)
business days  (or  such  later date  as  may  be determined  by  the  Board  of
Directors)  following the announcement of a  tender offer or exchange offer that
would result  in a  person or  group beneficially  owning 10%  or more  of  such
outstanding  shares of Common Stock.  However, if the Board  of Directors of the
Company determines that any  person who would otherwise  be an Acquiring  Person
has  become such  inadvertently, then such  person will not  become an Acquiring
Person if certain conditions are satisfied, including divestiture by such person
of beneficial ownership of the shares of Common Stock that would have  otherwise
caused such person to become an Acquiring Person.
 
    Until  the Distribution Date, (i) the Rights will be evidenced by the Common
Stock certificates and will be transferred with and only with such Common  Stock
certificates,  (ii) new  Common Stock certificates  issued after  March 23, 1992
contain a notation incorporating  the Rights Agreement  by reference, and  (iii)
the surrender for transfer of any certificates for Common Stock outstanding will
also  constitute the  transfer of  the Rights  associated with  the Common Stock
represented by  such certificates.  The  Rights are  not exercisable  until  the
Distribution  Date and will expire  at the close of  business on March 13, 2002,
unless earlier  redeemed by  the  Company as  described below  (the  "Expiration
Date").
 
    In  the event that (i) a Person becomes an Acquiring Person (except pursuant
to an offer for all outstanding shares of Common Stock which at least a majority
of the members of the Board of Directors who are not officers of the Company and
who are not representatives, nominees, affiliates or associates of an  Acquiring
Person  determine  to be  fair to  and otherwise  in the  best interests  of the
Company and its stockholders  (a "Fair Offer")) or  (ii) an Acquiring Person  or
any  of its affiliates or associates shall  merge into or otherwise combine with
the Company in a transaction in  which the Company is the surviving  corporation
and  the Common Stock remains outstanding and  unchanged, each holder of a Right
will thereafter have the right to  receive, upon exercise, Common Stock (or,  in
certain  circumstances, cash, property  or other securities of  the Company or a
reduction in the Purchase Price) having a value equal to two times the  exercise
price  of  the  Right.  Notwithstanding  any  of  the  foregoing,  following the
occurrence of any of  the events set  forth in this  paragraph, all Rights  that
are,  or (under certain  circumstances specified in  the Rights Agreement) were,
beneficially owned by  an Acquiring Person  or an associate  or affiliate of  an
Acquiring  Person will  be null  and void.  However, Rights  are not exercisable
following the occurrence of any of the events set forth in this paragraph  until
such  time as the  Rights are no longer  redeemable by the  Company as set forth
below.
 
    In the event that, at any time following the Stock Acquisition Date, (i) the
Company is acquired  in a merger  or other business  combination transaction  in
which the Company is not the surviving corporation
 
                                       20

(other  than a  merger described  in the preceding  paragraph or  a merger which
follows, and is at  the same price  as, a Fair  Offer), or (ii)  50% or more  of
UNUM's  assets or earning power  is sold or transferred,  each holder of a Right
(except Rights which previously  have become null and  void as set forth  above)
shall  thereafter have the right to receive,  upon exercise, common stock of the
acquiring company having a value  equal to two times  the exercise price of  the
Right. The events set forth in this paragraph and in the preceding paragraph are
referred to as the "Triggering Events."
 
    At  any time after there is an Acquiring Person and prior to the acquisition
by such Acquiring Person  of 50% or  more of the  outstanding Common Stock,  the
Board  of Directors  may exchange  the Rights  (other than  Rights owned  by the
Acquiring Person which have become  null and void), in whole  or in part, at  an
exchange  ratio of one share of Common Stock or one Unit of Junior Participating
Preferred Stock (or a share or unit of another series of the Company's preferred
stock having equivalent rights, preferences  and privileges) per Right  (subject
to adjustment).
 
    At  any time until ten  (10) days following the  Stock Acquisition Date, the
Company may redeem the Rights in whole, but not in part, at a price of $.01  per
Right  (the "Redemption Price"), which is payable in cash, Common Stock or other
consideration deemed appropriate by the Board of Directors. Immediately upon the
action of the Board of Directors  ordering redemption of the Rights, the  Rights
will  terminate and the only  right of the holders of  Rights will be to receive
the Redemption Price.
 
    The Purchase Price payable, and the number of shares of Junior Participating
Preferred Stock or other securities or  property issuable, upon exercise of  the
Rights are subject to adjustment from time to time to prevent dilution.
 
    Until a Right is exercised, the holder thereof, as such, will have no rights
as  a stockholder  of the Company,  including, without limitation,  the right to
vote  or   to  receive   dividends.  Stockholders   may,  depending   upon   the
circumstances,  recognize taxable  income in  the event  that the  Rights become
exercisable for Common Stock (or other consideration) or for common stock of the
acquiring company as set forth above.
 
    The Rights  have  certain  anti-takeover  effects.  The  Rights  will  cause
substantial  dilution to a person or group  that attempts to acquire the Company
in a manner which causes  the Rights to become  exercisable unless the offer  is
conditioned  on  substantially all  the  Rights being  acquired.  This potential
dilution may have the effect of delaying, deferring or discouraging attempts  to
acquire  control of the Company which are not approved by the Company's Board of
Directors. However, the  Rights should not  interfere with any  merger or  other
business combination approved by the Company's Board of Directors.
 
DESCRIPTION OF JUNIOR PARTICIPATING PREFERRED STOCK
 
    GENERAL.    In connection  with the  Rights  Agreement, 1,000,000  shares of
Junior Participating  Preferred  Stock have  been  reserved and  authorized  for
issuance  by  the  Board  of  Directors of  the  Company.  No  shares  of Junior
Participating Preferred Stock are outstanding as of the date of this Prospectus.
The following  statements with  respect to  the Junior  Participating  Preferred
Stock  do not purport to be complete  and are subject to the detailed provisions
of the Certificate of Incorporation and the certificate of designation  relating
to  the Junior Participating Preferred Stock (the "Certificate of Designation"),
which are  filed  as  exhibits  to the  Registration  Statement  of  which  this
Prospectus is a part.
 
    RANKING.   The Junior Participating Preferred Stock shall rank junior to all
other series of the Company's Preferred Stock as to the payment of dividends and
the distribution of assets,  unless the terms of  any such series shall  provide
otherwise.
 
    DIVIDENDS  AND DISTRIBUTIONS.   Subject to the prior  and superior rights of
the holders of any  shares of any  series of Preferred  Stock ranking prior  and
superior  to the shares of Junior  Participating Preferred Stock with respect to
dividends, the holders of shares  of Junior Participating Preferred Stock  shall
be  entitled to receive, when, as and if  declared by the Board of Directors out
of funds legally available for
 
                                       21

that purpose, quarterly dividends payable in  cash on the 19th day of  February,
May,  August and November in each year  (each such date being referred to herein
as "Quarterly Dividend Payment Date") commencing on the first Quarterly Dividend
Payment Date after  the first  issuance of  a share or  fraction of  a share  of
Junior  Participating Preferred  Stock, in an  amount per share  (rounded to the
nearest cent) equal to the  greater of (a) $5.00  or (b) (subject to  adjustment
upon  certain dilutive events) 100  times the aggregate per  share amount of all
cash dividends, and 100 times the  aggregate per share amount (payable in  kind)
of  all non-cash dividends or other  distributions other than a dividend payable
in shares of Common Stock or a  subdivision of the outstanding shares of  Common
Stock  (by reclassification or  otherwise), declared on  the Common Stock, since
the immediately preceding Quarterly Dividend  Payment Date, or, with respect  to
the first Quarterly Dividend Payment Date, since the first issuance of any share
or fraction of a share of Junior Participating Preferred Stock.
 
    The  Company  shall  declare  a  dividend  or  distribution  on  the  Junior
Participating Preferred  Stock  immediately  after it  declares  a  dividend  or
distribution  on the Common  Stock (other than  a dividend payable  in shares of
Common Stock); provided  that, in the  event no dividend  or distribution  shall
have  been declared on the Common Stock  during the period between any Quarterly
Dividend Payment Date and the next subsequent Quarterly Dividend Payment Date, a
dividend of $5.00 per  share on the Junior  Participating Preferred Stock  shall
nevertheless be payable on such subsequent Quarterly Dividend Payment Date.
 
    VOTING  RIGHTS.   The holders  of shares  of Junior  Participating Preferred
Stock shall have  the following voting  rights: (a) subject  to adjustment  upon
certain  dilutive  events, each  share of  Junior Participating  Preferred Stock
shall entitle the holder thereof to 100 votes on all matters submitted to a vote
of the stockholders  of the  Company; (b) except  as otherwise  provided by  the
Certificate  of  Designation  or  by  law,  the  holders  of  shares  of  Junior
Participating Preferred Stock and  the holders of shares  of Common Stock  shall
vote together as one class on all matters submitted to a vote of stockholders of
the  Company;  and (c)  if at  any  time dividends  on any  Junior Participating
Preferred Stock shall  be in arrears  in an  amount equal to  six (6)  quarterly
dividends  thereon, the occurrence of such  contingency shall mark the beginning
of a period  (herein called a  "default period") which  shall extend until  such
time  when all accrued and unpaid  dividends for all previous quarterly dividend
periods and for the  current quarterly dividend period  on all shares of  Junior
Participating Preferred Stock then outstanding shall have been declared and paid
or  set apart for payment. During each  default period, all holders of Preferred
Stock (including  holders  of the  Junior  Participating Preferred  Stock)  with
dividends  in arrears in an amount equal to six (6) quarterly dividends thereon,
voting as a class, irrespective of series, shall have the right to elect two (2)
Directors, until the expiration of a default period.
 
    LIQUIDATION, DISSOLUTION OR WINDING UP.  Upon any liquidation (voluntary  or
otherwise),  dissolution or winding up of  the Company, no distribution shall be
made to the holders of shares of stock ranking junior (either as to dividends or
upon liquidation,  dissolution  or  winding  up)  to  the  Junior  Participating
Preferred  Stock  unless,  prior  thereto,  the  holders  of  shares  of  Junior
Participating Preferred Stock shall have received $250 per share, plus an amount
equal to accrued and unpaid dividends and distributions thereon, whether or  not
declared,  to the date of such  payment (the "Series A Liquidation Preference").
Following the payment of the full amount of the Series A Liquidation Preference,
no additional distributions  shall be made  to the holders  of shares of  Junior
Participating  Preferred Stock unless,  prior thereto, the  holders of shares of
Common Stock shall have received an  amount per share (the "Common  Adjustment")
equal  to  the  quotient  obtained  by dividing  (i)  the  Series  A Liquidation
Preference by (ii)  100 (as  appropriately adjusted  to reflect  such events  as
stock  splits, stock dividends and recapitalizations  with respect to the Common
Stock) (such number in  clause (ii) immediately above  being referred to as  the
"Adjustment  Number"). Following the payment of the  full amount of the Series A
Liquidation Preference and the Common  Adjustment in respect of all  outstanding
shares  of Junior Participating Preferred  Stock and Common Stock, respectively,
holders of Junior Participating Preferred Stock and
 
                                       22

holders of shares of Common Stock shall receive their ratable and  proportionate
share  of the remaining assets to be  distributed in the ratio of the Adjustment
Number to one (1) with  respect to such Preferred Stock  and Common Stock, on  a
per share basis, respectively.
 
    In  the event,  however, that there  are not sufficient  assets available to
permit  payment  in  full  of  the  Series  A  Liquidation  Preference  and  the
liquidation  preferences of all  other series of preferred  stock, if any, which
rank on  a parity  with  the Junior  Participating  Preferred Stock,  then  such
remaining  assets shall  be distributed  ratably to  the holders  of such parity
shares in proportion to their respective liquidation preferences. In the  event,
however,  that there  are not sufficient  assets available to  permit payment in
full of the Common Adjustment, then  such remaining assets shall be  distributed
ratably to the holders of Common Stock.
 
    CONSOLIDATION,  MERGER,  ETC.   In  case the  Company  shall enter  into any
consolidation, merger, combination or other  transaction in which the shares  of
Common  Stock are exchanged for or changed  into other stock or securities, cash
and/or any  other  property,  then  in  any such  case,  the  shares  of  Junior
Participating  Preferred Stock shall at the  same time be similarly exchanged or
changed in an  amount per  share (subject  to adjustment  upon certain  dilutive
events)  equal  to 100  times the  aggregate amount  of stock,  securities, cash
and/or any other property (payable in kind),  as the case may be, into which  or
for which each share of Common Stock is changed or exchanged.
 
    REDEMPTION.   The outstanding shares of Junior Participating Preferred Stock
may be redeemed at  the option of the  Board of Directors in  whole, but not  in
part,  at any time, or from time to time, at a cash price per share equal to 105
percent of (i)  the product of  the Adjustment Number  times the Average  Market
Value  (as such term is hereinafter defined)  of the Common Stock, plus (ii) all
dividends which on the redemption date have accrued on the shares to be redeemed
and have not been paid, or declared and a sum sufficient for the payment thereof
set apart, without interest.  The "Average Market Value"  is the average of  the
closing  sale prices  of the Common  Stock during the  30-day period immediately
preceding the date before the redemption date on the Composite Tape for New York
Stock Exchange Listed Stocks, or, if such  stock is not quoted on the  Composite
Tape,  on the New York Stock  Exchange, or, if such stock  is not listed on such
Exchange, on the  principal United States  securities exchange registered  under
the Exchange Act, on which such stock is listed, or, if such stock is not listed
on  any such exchange, the average of the  closing sale prices with respect to a
share of  Common Stock  during such  30-day period,  as quoted  on the  National
Association  of  Securities Dealers,  Inc.  Automated Quotations  System  or any
system then in use,  or, if no  such quotations are  available, the fair  market
value of the Common Stock as determined by the Board of Directors in good faith.
 
                            DESCRIPTION OF WARRANTS
 
    The  Company  may  issue  Warrants,  including  Warrants  to  purchase  Debt
Securities, Preferred Stock, Common  Stock or other  securities of the  Company.
Warrants may be issued independently or together with any such securities of the
Company  and may be attached to or separate from such securities of the Company.
The Warrants  are  to  be  issued under  warrant  agreements  (each  a  "Warrant
Agreement")  to be entered into between the Company and a bank or trust company,
as warrant  agent (the  "Warrant  Agent"), all  as shall  be  set forth  in  the
Prospectus Supplement relating to Warrants being offered pursuant thereto.
 
WARRANTS
 
    The  applicable Prospectus  Supplement will  describe the  terms of Warrants
offered thereby, the Warrant Agreement relating to such Warrants and the warrant
certificates representing such Warrants, including the following: (1) the  title
of  such Warrants; (2) the securities of the Company for which such Warrants are
exercisable; (3) the aggregate number of such Warrants; (4) the price or  prices
at which such Warrants will be issued; (5) the currency or currencies, including
composite  currencies or currency units, in which the price of such Warrants may
be   payable;    (6)    the    procedures    and    conditions    relating    to
 
                                       23

the  exercise of  such Warrants;  (7) the designation  and terms  of any related
securities of the Company with which such Warrants are issued, and the number of
such Warrants issued with each such security; (8) the date, if any, on and after
which such Warrants and the related securities of the Company will be separately
transferable; (9) the date  on which the right  to exercise such Warrants  shall
commence,  and the date  on which such  right shall expire;  (10) the maximum or
minimum number of  such Warrants  which may  be exercised  at any  time; (11)  a
discussion  of material United States Federal income tax considerations, if any;
(12) any other  terms of  such Warrants  and terms,  procedures and  limitations
relating  to the exercise of such Warrants; and (13) the terms of the securities
of the Company purchasable upon exercise of such Warrants.
 
    Warrant certificates  will  be exchanged  for  new warrant  certificates  of
different  denominations, and Warrants  may be exercised  at the corporate trust
office of the  Warrant Agent  or any other  office indicated  in the  Prospectus
Supplement.  Prior  to  the  exercise of  their  Warrants,  holders  of Warrants
exercisable for Debt Securities will  not have any of  the rights of holders  of
the  Debt Securities purchasable upon such exercise  and will not be entitled to
payments of principal  (or premium, if  any) or  interest, if any,  on the  Debt
Securities  purchasable  upon  such exercise.  Prior  to the  exercise  of their
Warrants for shares of Preferred Stock or Common Stock, holders of such Warrants
will not have  any rights  of holders  of the  Preferred Stock  or Common  Stock
purchasable upon such exercise and will not be entitled to dividend payments, if
any,  or voting rights of  the Preferred Stock or  Common Stock purchasable upon
such exercise.
 
EXERCISE OF WARRANTS
 
    Each Warrant will entitle the holder  of Warrants to purchase for cash  such
principal  amount or such number  of securities of the  Company at such exercise
price as shall in each case be set forth in, or be determinable as set forth in,
the Prospectus Supplement relating  to the Warrants  offered thereby. After  the
close of business on the expiration date, unexercised Warrants will become void.
 
    Warrants may be exercised as set forth in the Prospectus Supplement relating
to  the  Warrants  offered thereby.  Upon  receipt  of payment  and  the warrant
certificate properly completed and duly  executed at the corporate trust  office
of the Warrant Agent or any other office indicated in the Prospectus Supplement,
the  Company will,  as soon as  practicable, forward  the securities purchasable
upon such exercise. If less than all of the Warrants represented by such warrant
certificate are exercised,  a new  warrant certificate  will be  issued for  the
remaining Warrants.
 
                             FOREIGN CURRENCY RISKS
 
GENERAL
 
    EXCHANGE  RATES AND  EXCHANGE CONTROLS.   An  investment in  Debt Securities
denominated in other than  U.S. dollars entails significant  risks that are  not
associated  with a similar investment in a security denominated in U.S. dollars.
Such risks include, without limitation,  the possibility of significant  changes
in  rates of exchange between the U.S. dollar and the various foreign currencies
or composite currencies, and the  possibility of the imposition or  modification
of  foreign exchange  controls by either  the U.S. or  foreign governments. Such
risks generally depend on economic and  political events over which the  Company
has  no control. In recent years, rates  of exchange between the U.S. dollar and
certain foreign currencies have been highly volatile, and such volatility may be
expected to continue in the future. Fluctuations in any particular exchange rate
that have  occurred in  the past  are not  necessarily indicative,  however,  of
fluctuations  in the rate that  may occur during the  term of any Debt Security.
Depreciation of the Specified Currency other than U.S. dollars against the  U.S.
dollar  would result in a decrease in  the effective yield of such Debt Security
below its coupon rate, and  in certain circumstances could  result in a 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 foreign currency at a Debt Security's
 
                                       24

maturity. Even if there are no actual exchange controls, it is possible that the
Specified  Currency for any  particular Debt Security would  not be available at
such Debt Security's maturity. In that  event, the Company will repay such  Debt
Security at maturity in U.S. dollars on the basis of the most recently available
Exchange Rate.
 
    This  Prospectus does not  describe all the  risks of an  investment in Debt
Securities denominated in other than U.S. dollars. Prospective investors  should
consult  their own financial and  legal advisors as to  the risks entailed by an
investment in  Debt Securities  denominated  in other  than U.S.  dollars.  Debt
Securities  denominated  in  other  than U.S.  dollars  are  not  an appropriate
investment  for  investors  who  are  unsophisticated  about  foreign   currency
transactions.
 
    Currently,  there are limited facilities in the United States for conversion
of U.S. dollars into certain foreign currencies, and vice versa.
 
    Unless otherwise  specified in  the Prospectus  Supplement, Debt  Securities
denominated  in other than U.S.  dollars or European currency  units will not be
sold in, or to residents of, the country issuing the Specified Currency in which
particular Debt Securities are  denominated. The information  set forth in  this
Prospectus   is  directed  to  prospective  purchasers  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 as to any
matters  that  may  affect the  purchase,  holding,  or receipt  of  payments of
principal of and interest  on the Debt Securities.  Such persons should  consult
their own financial and legal advisors with regard to such matters.
 
    GOVERNING  LAW AND JUDGMENTS.   The Debt Securities will  be governed by and
construed in  accordance with  the laws  of the  State of  New York.  Under  the
Judiciary  Law of the State of  New York, a judgment in  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.
 
EXCHANGE RATE AND CONTROLS FOR SPECIFIED CURRENCIES
 
    For any Debt Security denominated in other than U.S. dollars, the Prospectus
Supplement relating to such Debt Securities will contain information  concerning
exchange rates. The information concerning exchange rates will be furnished as a
matter  of information only and should not be regarded as indicative of the rate
of or trends in future fluctuations in currency exchange rates.
 
                              PLAN OF DISTRIBUTION
 
    The Company may  sell Securities to  or through underwriters,  and also  may
sell Securities directly to other purchasers or through agents.
 
    The  distribution of the Securities may be effected from time to time in one
or more transactions at  a fixed price  or prices, which may  be changed, or  at
market  prices  prevailing  at the  time  of  sale, at  prices  related  to such
prevailing market prices or at negotiated prices.
 
    In  connection  with  the  sale  of  Securities,  underwriters  may  receive
compensation  from the Company  or from purchasers of  Securities, for whom they
may act  as agents,  in  the form  of  discounts, concessions,  or  commissions.
Underwriters  may sell  Securities to or  through dealers, and  such dealers may
receive compensation in the form of discounts, concessions, or commissions  from
the underwriters and/or commissions from the purchasers for whom they may act as
agents.  Underwriters, dealers, and agents  that participate in the distribution
of Securities may be deemed to be underwriters, and any discounts or commissions
they receive from the Company, and any  profit on the resale of Securities  they
realize  may be deemed  to be underwriting discounts  and commissions, under the
Securities Act. Any such underwriter or  agent will be identified, and any  such
compensation  received from  the Company  will be  described, in  the Prospectus
Supplement.
 
                                       25

    Each series of Securities  will be a new  issue with no established  trading
market,  other  than the  Common Stock  which is  listed on  the New  York Stock
Exchange and the  Pacific Stock Exchange.  Any Common Stock  sold pursuant to  a
Prospectus  Supplement will  be listed  on such  exchanges, subject  to official
notice of issuance. The Company may elect to list any series of Debt Securities,
Preferred Stock or Warrants on an exchange, but is not obligated to do so. It is
possible that  one  or more  underwriters  may make  a  market in  a  series  of
Securities,  but will not be  obligated to do so  and may discontinue any market
making at any time without  notice. Therefore, no assurance  can be given as  to
the liquidity of the trading market for the Securities.
 
    Under  agreements  the Company  may enter  into, underwriters,  dealers, and
agents who  participate in  the  distribution of  Securities maybe  entitled  to
indemnification   by   the  Company   against  certain   liabilities,  including
liabilities under the Securities Act.
 
    Underwriters, dealers and agents may engage in transactions with, or perform
services for,  or  be  customers of,  the  Company  in the  ordinary  course  of
business.
 
    If  so indicated  in the Prospectus  Supplement, the  Company will authorize
underwriters or other persons acting as  the Company's agents to solicit  offers
by  certain institutions  to purchase  Securities from  the Company  pursuant to
contracts providing for payment and delivery on a future date. Institutions with
which such contracts may be made include commercial and savings banks, insurance
companies, pension  funds,  investment  companies,  educational  and  charitable
institutions  and others, but in all cases such institutions must be approved by
the Company. The obligations  of any purchaser under  any such contract will  be
subject  to the condition that  the purchase of the  Securities shall not at the
time of delivery be prohibited under the laws of the jurisdiction to which  such
purchaser  is subject. The underwriters and such  other agents will not have any
responsibility in respect of the validity or performance of such contracts.
 
                           VALIDITY OF THE SECURITIES
 
    The validity  of the  Securities will  be  passed upon  for the  Company  by
Skadden,  Arps, Slate, Meagher &  Flom, New York, New  York. The validity of the
Securities in connection with any offering  thereof will be passed upon for  the
Company  by  Kevin  J. Tierney,  Senior  Vice President,  Secretary  and General
Counsel of the Company and  by Skadden, Arps, Slate,  Meagher & Flom, New  York,
New  York  with  respect  to  certain  matters of  New  York  law,  and  for the
underwriters or agents by Sullivan &  Cromwell, New York, New York. Mr.  Tierney
owns less than one percent of the Company's Common Stock.
 
                                    EXPERTS
 
    The  consolidated financial statements  of the Company  and its subsidiaries
included in the Company's Annual Report on Form 10-K for the year ended December
31, 1995, have been incorporated herein by reference in reliance upon the report
of  Coopers  &   Lybrand  L.L.P,  independent   certified  public   accountants,
incorporated by reference herein, and upon the authority of said firm as experts
in accounting and auditing.
 
                                       26

                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
    The  following table sets forth all expenses in connection with the issuance
and distribution of the Securities being registered. All amounts except the  SEC
registration fee and the rating agency fees are estimates.
 


SEC registration fee.............................................  $ 139,484
                                                                
Fees and expenses of accountants.................................     90,000
Fees and expenses of counsel.....................................    100,000
Blue sky fees and expenses.......................................     23,000
Fees and expenses of Trustee.....................................     20,000
Printing and engraving expenses..................................     75,000
Rating agency fees...............................................    125,000
Miscellaneous....................................................      5,000
                                                                   ---------
        Total....................................................  $ 577,484
                                                                   ---------
                                                                   ---------

 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    Article  Thirteenth of  the Company's Certificate  of Incorporation provides
for the elimination of personal monetary liabilities of directors of the Company
for breaches of certain of their  fiduciary duties to the full extent  permitted
by  Section 102(b)(7)  of the General  Corporation Law of  Delaware (the "GCL").
Section 102(b)(7)  of  the GCL  enables  a  corporation in  its  certificate  of
incorporation  to eliminate  or limit the  personal liability of  members of its
board of directors to the corporation  or its stockholders for monetary  damages
for  violations of a director's fiduciary duty  of care. Such a provision has no
effect on  the availability  of equitable  remedies, such  as an  injunction  or
rescission,  for breach  of fiduciary duty.  In addition, no  such provision may
eliminate or  limit  the liability  of  a director  for  breaching his  duty  of
loyalty,  failing to  act in good  faith, engaging in  intentional misconduct or
knowingly violating the law, paying an unlawful dividend or approving an illegal
stock repurchase, or obtaining an improper personal benefit.
 
    Article VIII of the  Company's By-Laws provides  that directors and  certain
other personnel of the Company shall be indemnified against expenses and certain
other  liabilities arising  out of legal  actions brought  or threatened against
them  for  their  conduct  on  behalf   of  the  Company,  subject  to   certain
qualifications  and provided that each such person  acted in good faith and in a
manner that such person reasonably believed was in the Company's best  interest.
The  Company has entered into indemnification  agreements with each director and
certain officers of the Company and  one of its subsidiaries providing that  (a)
the  Company agrees to comply  in all respects with  each and every provision of
Article VIII of  the By-Laws  in effect  on the date  of the  agreement, (b)  no
amendment  to Article VIII or the agreement will eliminate, reduce or affect any
such directors' or  officers' rights under  Article VIII or  the agreement  with
respect  to indemnification,  and (c)  no legal action  shall be  brought and no
cause of action shall  be asserted by  or on behalf of  the Company against  the
indemnified  party after the expiration of two years from the date of accrual of
such cause of action.
 
    The Company  maintains directors,  and officers,  liability insurance  which
insures  against liabilities that directors or officers of the Company may incur
in such capacities.
 
                                      II-1

ITEM 16.  LIST OF EXHIBITS.
 
    The following exhibits are filed as part of this Registration Statement.
 


EXHIBIT NO.                                                 DESCRIPTION OF EXHIBITS
- -----------             ------------------------------------------------------------------------------------------------
 
                  
      1.1           --  Form of Underwriting Agreement for the Securities.
      1.2           --  Form of Distribution Agreement for Medium-Term Notes, Series C.
      3.1           --  Certificate of Incorporation of UNUM Corporation,  as amended; incorporated herein by  reference
                        to UNUM Corporation's Annual Report on Form 10-K dated March 25, 1992.
      3.2           --  By-Laws  of  UNUM Corporation;  incorporated herein  by reference  to UNUM  Corporation's Annual
                        Report on Form 10-K dated March 25, 1992.
      4.1(a)        --  Rights Agreement; incorporated herein  by reference to UNUM  Corporation's Form 8-K dated  March
                        18, 1992.
      4.1(b)        --  First  Amendment,  dated  as of  June  19, 1996,  to  Rights Agreement,  incorporated  herein by
                        reference to UNUM Corporation's Form 8-A dated June 21, 1996.
      4.2           --  Form of  Certificate for  shares  of Common  Stock; incorporated  herein  by reference  to  UNUM
                        Corporation's Registration Statement on Form S-4 (File No. 33-55870).
      4.3           --  Indenture  dated as of September 15, 1990 between  UNUM Corporation and The Chase Manhattan Bank
                        (National Association),  as  Trustee  (including  the  form  of  the  Senior  Debt  Securities);
                        incorporated  herein by reference to UNUM Corporation's Registration Statement on Form S-3 (File
                        No. 33-36873).
      4.4           --  Indenture dated as of  May 1, 1995 between  UNUM Corporation and Mellon  Bank, N.A., as  Trustee
                        (including  the form  of the  Subordinated Debt Securities);  incorporated by  reference to UNUM
                        Corporation's Form 8-K dated May 1, 1995.
      5             --  Opinion of Skadden, Arps, Slate, Meagher & Flom.
     12             --  Statements re: Computation of Ratio of Earnings to Fixed Charges.
     15             --  Letter re: Unaudited Interim Financial Information.
     23.1           --  Consent of Skadden, Arps, Slate, Meagher & Flom (included as part of Exhibit 5).
     23.2           --  Consent of Coopers & Lybrand L.L.P.
     24             --  Powers of Attorney, included as part of the signature page hereof.
     25.1           --  Form T-1 Statement of Eligibility of The  Chase Manhattan Bank (National Association) under  the
                        Trust Indenture Act of 1939.
     25.2           --  Form T-1 Statement of Eligibility of Mellon Bank, N.A. under the Trust Indenture Act of 1939.

 
ITEM 17.  UNDERTAKINGS.
 
    The Company hereby undertakes:
 
    (1)  To file, during any  period in which offers or  sales are being made, 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;
 
        (ii)  To reflect in the prospectus any facts or events arising after the
    effective  date  of   the  registration  statement   (or  the  most   recent
    post-effective  amendment thereof) which, individually  or in the aggregate,
    represent  a  fundamental  change  in  the  information  set  forth  in  the
    registration  statement.  Notwithstanding  the  foregoing,  any  increase or
    decrease in  volume of  securities offered  (if the  total dollar  value  of
    securities  offered  would not  exceed that  which  was registered)  and any
    deviation from the low or high  end of the estimated maximum offering  range
    may  be  reflected  in the  form  of  prospectus filed  with  the Commission
    pursuant to Rule  424(b) if,  in the aggregate,  the changes  in volume  and
    price  represent no more than a 20% change in the maximum aggregate offering
    price set  forth in  the  "Calculation of  Registration  Fee" table  in  the
    effective registration statement;
 
                                      II-2

        (iii)  To include any  material information with respect  to the plan of
    distribution not previously disclosed in  the Registration Statement or  any
    material change to such information in the Registration Statement;
 
PROVIDED,  HOWEVER,  that paragraphs  (1)(i)  and (1)(ii)  do  not apply  if the
Registration Statement  is  on Form  S-3  and  the information  required  to  be
included  in  a post-effective  amendment by  those  paragraphs is  contained in
periodic reports  filed with  or  furnished to  the  Commission by  the  Company
pursuant  to Section 13 or 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the Registration Statement.
 
    (2) That, for the purpose of determining any liability under the  Securities
Act  of 1933,  each such post-effective  amendment 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.
 
    (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.
 
    The  Company  hereby  undertakes  that,  for  purposes  of  determining  any
liability under the Securities Act of 1933, each filing of the Company's  annual
report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934
that is incorporated by reference in this Registration Statement shall be deemed
to  be a new registration statement relating  to the securities therein, and the
offering of such securities at that time shall be deemed to be the initial  BONA
FIDE offering thereof.
 
    Insofar  as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to  directors, officers and controlling persons of  the
Company  pursuant to the provisions referred to  an Item 15 of this Registration
Statement, or otherwise, the Company has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Act  and is, therefore, unenforceable.  In the event that  a
claim  for indemnification against  such liabilities (other  than the payment by
the Company of expenses incurred or  paid by a director, officer or  controlling
person  of  the  Company  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, the Company will, unless in the
opinion  of its  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 the Act and will
be governed by the final adjudication of such issue.
 
                                      II-3

                                   SIGNATURES
 
    Pursuant  to the requirements of the  Securities Act of 1933, the Registrant
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 to  be  signed  on  its behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Portland and State of Maine, on the 12th day of July,
1996.
 
                                          UNUM CORPORATION
 
                                          By:        /s/ JAMES F. ORR III
 
                                             -----------------------------------
                                                      JAMES F. ORR III
                                                   CHAIRMAN OF THE BOARD,
                                                    PRESIDENT, AND CHIEF
                                                      EXECUTIVE OFFICER
 
                               POWER OF ATTORNEY
 
    KNOW  ALL MEN  BY THESE PRESENTS,  that each person  whose signature appears
below constitutes and appoints  Kevin J. Tierney and  John-Paul DeRosa his  true
and  lawful attorneys-in-fact and agents, each acting alone, with full powers of
substitution and resubstitution, for  him and in his  name, place and stead,  in
any  and all  capacities, to  sign any  or all  amendments to  this Registration
Statement, including post-effective amendments, and  to file the same, with  all
exhibits  thereto,  and  other  documents  in  connection  therewith,  with  the
Securities and  Exchange Commission,  granting unto  said attorneys-in-fact  and
agents  full power and authority to do and  perform each and every act and thing
requisite and necessary to be  done in and about the  premises, as fully to  all
intents  and purposes as he might or could do in person, and hereby ratifies and
confirms all his said  attorneys-in-fact and agents, each  acting alone, or  his
substitute  or  substitutes, may  lawfully  do or  cause  to be  done  by virtue
thereof.
 
    Pursuant  to  the  requirements  of   the  Securities  Act  of  1933,   this
Registration  Statement has  been signed below  by the following  persons in the
capacities indicated on the 12th day of July, 1996.
 


                      SIGNATURE                                                   TITLE
- ------------------------------------------------------  ---------------------------------------------------------
                                                     
                       /s/ JAMES F. ORR III
     -------------------------------------------        Chairman of the Board, President and Chief Executive
                   JAMES F. ORR III                       Officer
 
                      /s/ ROBERT W. CRISPIN
     -------------------------------------------        Executive Vice President and Chief Financial Officer
                  ROBERT W. CRISPIN
 
                     /s/ STEPHEN D. ROBERTS
     -------------------------------------------        Vice President and Corporate Controller
                  STEPHEN D. ROBERTS
 
                       /s/ GAYLE O. AVERYT
     -------------------------------------------        Director
                   GAYLE O. AVERYT

 
                                      II-4



                      SIGNATURE                                                   TITLE
- ------------------------------------------------------  ---------------------------------------------------------
                                                     
                   /s/ ROBERT E. DILLON, JR.
     -------------------------------------------                                Director
                ROBERT E. DILLON, JR.
 
                     /s/ GWAIN H. GILLESPIE
     -------------------------------------------                                Director
                  GWAIN H. GILLESPIE
 
                   /s/ RONALD E. GOLDSBERRY
     -------------------------------------------                                Director
                 RONALD E. GOLDSBERRY
 
                     /s/ DONALD W. HARWARD
     -------------------------------------------                                Director
                  DONALD W. HARWARD
 
                     /s/ GEORGE J. MITCHELL
     -------------------------------------------                                Director
                  GEORGE J. MITCHELL
 
                   /s/ CYNTHIA A. MONTGOMERY
     -------------------------------------------                                Director
                CYNTHIA A. MONTGOMERY
 
                    /s/ JAMES L. MOODY, JR.
     -------------------------------------------                                Director
                 JAMES L. MOODY, JR.
 
                      /s/ LAWRENCE R. PUGH
     -------------------------------------------                                Director
                   LAWRENCE R. PUGH
 
                      /s/ LOIS DICKSON RICE
     -------------------------------------------                                Director
                  LOIS DICKSON RICE
 
                         /s/ JOHN W. ROWE
     -------------------------------------------                                Director
                     JOHN W. ROWE

 
                                      II-5

                                 EXHIBIT INDEX
 


EXHIBIT NO.
- -----------
 
                                                                                                        
      1.1           --  Form of Underwriting Agreement for the Securities.
      1.2           --  Form of Distribution Agreement for Medium-Term Notes, Series C.
      3.1           --  Certificate  of Incorporation of  UNUM Corporation, as  amended, incorporated herein by
                        reference to UNUM Corporation's Annual Report on Form 10-K dated March 25, 1992.
      3.2           --  By-Laws of UNUM  Corporation; incorporated  herein by reference  to UNUM  Corporation's
                        Annual Report on Form 10-K dated March 25, 1992.
      4.1(a)        --  Rights Agreement; incorporated herein by reference to UNUM Corporation's Form 8-K dated
                        March 18, 1992.
      4.1(b)        --  First Amendment, dated as of June 19, 1996, to Rights Agreement; incorporated herein by
                        reference to UNUM Corporation's Form 8-A dated June 21, 1996.
      4.2           --  Form  of Certificate for  shares of Common  Stock; incorporated herein  by reference to
                        UNUM Corporation's Registration Statement on Form S-4 (File No. 33-55870).
      4.3           --  Indenture dated  as  of September  15,  1990 between  UNUM  Corporation and  The  Chase
                        Manhattan  Bank (National  Association), as Trustee  (including the form  of the Senior
                        Debt Securities): incorporated herein by  reference to UNUM Corporation's  Registration
                        Statement on Form S-3 (File No. 33-36873).
      4.4           --  Indenture  dated as of May  1, 1995 between UNUM Corporation  and Mellon Bank, N.A., as
                        Trustee (including  the form  of  the Subordinated  Debt Securities);  incorporated  by
                        reference to UNUM Corporation's Form 8-K dated May 1, 1995.
      5             --  Opinion of Skadden, Arps, Slate, Meagher & Flom.
     12             --  Statements re: Computation of Ratio of Earnings to Fixed Charges.
     15             --  Letter re: Unaudited Interim Financial Information.
     23.1           --  Consent of Skadden, Arps, Slate, Meagher & Flom (included as part of Exhibit 5).
     23.2           --  Consent of Coopers & Lybrand L.L.P.
     24             --  Powers of Attorney, included as part of the signature page hereof.
     25.1           --  Form  T-1 Statement of  Eligibility of The Chase  Manhattan Bank (National Association)
                        under the Trust Indenture Act of 1939.
     25.2           --  Form T-1 Statement of Eligibility of Mellon Bank, N.A. under the Trust Indenture Act of
                        1939.

 
                                      II-6