1

                                                                   EXHIBIT 10.20










                               FIRST AMENDMENT TO

                           REVOLVING CREDIT AGREEMENT

                                      AMONG

                         AMERITRADE HOLDING CORPORATION,
                          FIRST NATIONAL BANK OF OMAHA,
                         HARRIS TRUST AND SAVINGS BANK,
                            LASALLE NATIONAL BANK AND
                       MERCANTILE BANK OF ST. LOUIS, N.A.

                                  MAY 24, 1999


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                 FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT

     THIS FIRST AMENDMENT to REVOLVING CREDIT AGREEMENT (the "First Amendment")
entered into as of this 24th day of May, 1999, is intended to amend the terms of
the Revolving Credit Agreement (the "Agreement") dated as of the 16th day of
January, 1998, among AMERITRADE HOLDING CORPORATION, a Delaware corporation
having its principal place of business at 4211 South 10201 Street, Omaha,
Nebraska 68127 (the "Borrower"); FIRST NATIONAL BANK OF OMAHA, a national
banking association having its principal place of business at One First National
Center, Omaha, Nebraska 68102 ("Agent" or ("FNB-O"); HARRIS TRUST AND SAVINGS
BANK, an Illinois banking corporation having its principal place of business at
111 W. Monroe Street, Chicago, Illinois 60603 ("Harris"); LASALLE BANK, N.A.
(formerly LASALLE NATIONAL BANK), a national banking association located at 801
Grand Street, Suite 3150, Des Moines, Iowa 50309 ("LaSalle"); and MERCANTILE
BANK OF ST. LOUIS, N.A., a national banking association having its principal
place of business at One Mercantile Center, 7th and Washington TRAM 12-3, St.
Louis, Missouri 63101 ("Mercantile"). All terms and conditions of the Agreement
shall remain in full force and effort except as expressly amended herein. All
capitalized terms herein shall have the meaning prescribed in the Agreement.
This Agreement shall be amended as follows:

     1.   The following definition is added to Article I of the Agreement:

          Permitted Investments:   Any one or more of the following:

                                   (a) certificates of deposit fully covered by
                                   Federal Deposit Insurance and maintained at a
                                   bank having capital and surplus of not less
                                   than $50,000,000;

                                   (b) short-term obligations of, or obligations
                                   fully guaranteed by, the United States of
                                   America or any agencies thereof;

                                   (c) commercial paper rated at least A-1 by
                                   Standard and Poor's Corporation. or P-1 by
                                   Moody's Investors Service, Inc.; and

                                   (d) demand deposit accounts maintained in
                                   the ordinary course of the Borrower's
                                   business at a


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                                   bank having capital and surplus of not less
                                   than $50,000,000

     The definition of "AmeriTrade Clearing" shall now refer to Advance
     Clearing, Inc., the new name for AmeriTrade Clearing. Either "AmeriTrade
     Clearing" or "Advance Clearing" shall refer to this entity. Any reference
     to "LaSalle National Bank" shall mean "LaSalle Bank, N.A."

     2.   Section 2.1 of the Agreement is hereby amended to read as follows:

          2.1 Revolving Credit Until December 31, 2000, the Revolving Lenders
          severally agree to advance funds for general corporate purposes not to
          exceed the amount shown below (the "Base Revolving Credit Facility")
          to the Borrower on a revolving credit basis. Such Advances shall be
          made on a pro rata basis by the Revolving Lenders, based on the
          following maximum advance limits and applicable percentages for each
          Revolving Lender: (i) as to FNB-O, $24,000,000 (32%); (ii) as to
          Harris Trust and Savings Bank, $18,000,000 (24%); (iii) as to
          Mercantile Bank of St. Louis N.A., $18,000,000 (24%); (iv) as to
          LaSalle Bank, N.A.$ 15,000,000 (20%); provided however that each
          Revolving Lender's Commitment is several and not joint or joint and
          several. The Base Revolving Credit Facility shall be as follows:

               Closing until June 30, 2000              $75,000,000
               July 1, 2000 - September 30, 2000        $71,875,000
               October 1, 2000 - December 31, 2000      $68,750,000

          The Borrower shall not be entitled to any Advance hereunder if, after
          the making of such Advance, the Principal Loan Amount would exceed the
          least of (x) the then current Base Revolving Credit Facility, or (y)
          one and one-half (1 1/2) times the Borrower's Annualized Modified Cash
          Flow, or (z) the number of Core Retail Accounts times $200, determined
          in each case after giving effect to the requested Advance. Nor shall
          the Borrower be entitled to any further Advances hereunder after the
          occurrence and during the continuation of any Event of Default or any
          event which with the passage of time or the giving of notice or both
          would constitute an Event of Default, or if the Borrower's
          representations and warranties cease to be true and correct at the
          time of the requested Advance. Advances shall be made, on the terms
          and conditions of this Agreement, upon the Borrower's request.
          Requests shall be made by 12:00 noon Omaha time on the Business Day
          prior to the requested date of the Advance. Requests shall be made by
          presentation to FNB-O of a drawing certificate in the form of Exhibit
          B. The




                                      -2-

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          Borrower's obligation to make payments of principal and interest on
          the foregoing revolving credit indebtedness shall be further evidenced
          by the Notes.

     3.   III. REPRESENTATIONS AND WARRANTIES of the Agreement is amended to
          include Section 3.14 as follows:

          3.14 Year 2000 Compliance. The Borrower has completed its Year 2000
          inventory, and where indicated by such inventory, has upgraded (or by
          September 30, 1999, will have completed its upgrading of) all its
          computer hardware and software systems, so that the effect of the
          arrival of January 1, 2000, on the Borrower's computer systems will
          not create a material adverse effect upon the conduct of its business.

     4.   Section 4.2 of the Agreement is hereby amended to read as follows:

          4.2 Corporate Structure and Assets. The Borrower shall not merge or
          consolidate with any other corporation or entity without the prior
          written consent of the Requisite Revolving Lenders, except as provided
          below. The Borrower shall not sell any assets, other than in the
          ordinary course of business, in an aggregate amount greater than one
          million dollars ($1,000,000), except (a) items that are obsolete or no
          longer necessary for operation of the business, and (b) the Borrower's
          interest in Comprehensive Software Systems, Ltd. and Knight/Trimark
          Group, Inc. The Revolving Lenders shall be entitled to receive as a
          prepayment on the Notes the Proceeds of any sale of assets of the
          Borrower which are prohibited by the preceding sentence.
          Notwithstanding the foregoing prepayment requirements, any such
          prohibited sale shall remain a violation of this Agreement. Any
          proceeds from the Sale of Knight/Trimark Group, Inc. shall be either
          paid to the Lenders as a prepayment on the Notes or shall be retained
          by the Borrower and shall be reinvested solely in Permitted
          Investments or additional investments in Advance Clearing. At all
          times during the term of this Agreement, the Borrower shall keep its
          stock of Knight/Trimark free from all liens, pledges and other
          encumbrances (other than agreements to sell such stock). In addition,
          the Borrower shall not engage in any business materially different
          from that in which it is presently engaged and businesses reasonably
          related thereto without the prior written consent of the Requisite
          Revolving Lenders, which consent shall not be unreasonably withheld.
          The foregoing restrictions on mergers and consolidations shall not
          apply if: (i) in the case of a merger, the Borrower is the surviving
          entity and expressly reaffirms its obligations hereunder; (ii) in the
          case of a consolidation, the resulting corporation expressly assumes
          the obligations of the Borrower hereunder, (iii) the surviving or
          resulting corporation is organized under the laws of the United States
          or a jurisdiction thereof; (iv) after giving effect to such merger or
          consolidation, the surviving or resulting corporation will be



                                      -3-

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          engaged in substantially the same lines of business as are now engaged
          in by the Borrower and its Subsidiaries and businesses reasonably
          related thereto; and (v) immediately after giving effect to such
          merger or consolidation, no Event of Default will exist hereunder.

     5.   Section 4.3 of the Agreement is hereby amended to read as follows:

          4.3 Net Worth, The Borrower shall maintain a minimum Net Worth during
          the term of this Agreement of at least the amounts set forth
          hereunder.

                              Period                  Minimum Net Worth
                              ------                  -----------------
          Prior to            12/31/99                $85,000,000

          After 12/31/99
          but on or prior to 12/31/2000               $105,000,000

     6.   Section 4.16 of the Agreement is hereby amended to read as follows:

          4.16 Capital Expenditures. The Borrower shall not incur in any fiscal
          year capital expenditures, determined in accordance with generally
          accepted accounting principles, of more than $50,000,000; provided
          however that any portion of such $50,000,000 which is not expanded for
          capital expenditures may be rolled over and added to the capital
          expenditures permitted for the next fiscal year.

     7.   The fiscal year acquisition and investment amount referenced at (i) of
          Section 4.17 of the Agreement is hereby increased from Two Million
          Five Hundred Thousand Dollars ($2,500,000) to Five Million Dollars
          ($5,000,000).

     8.   Section 4.20 of the Agreement is hereby amended to read as follows:

          4.20 Minimum Core Retail Accounts. The Borrower will have at least the
          number of Core Retail Accounts on the dates set forth below:

                    Date                     Minimum Core Retail Accounts
                    ----                     ----------------------------
                    Prior to 12/31/99                  290,000

                    12/31/99                           375,000
                    & after

     9.   The following is added as Section 4.24 of the Agreement:




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          Section 4.24 Stock Offerings If the Borrower shall receive Net Cash
          Proceeds from any public offering of common stock of the Borrower in
          an amount in excess of $50,000,000 (a "Qualified Public Offering"),
          the Borrower shall repay the amount, if any, outstanding on the Notes
          in an amount equal to 100% of such Net Cash Proceeds of such Qualified
          Public Offering (provided that the Base Revolving Credit Facility
          shall not be reduced or terminated by such offering or such payment).
          When used in this section, "Net Cash Proceeds" means, with respect to
          any issuance of common stock, the aggregate cash, proceeds received by
          the Borrower pursuant to such issuance, net of the costs relating to
          such issuance (including, without limitation, sales and underwriter's
          commissions and legal, accounting, printing and investment banking
          fees).

     10.  Section 7.8 is hereby amended to read as follows:

          Section 7.8 Agenting Fee. The Borrower will pay to FNB-O an annual
          agenting fee equal to $37,500, payable quarterly on or before the last
          day of such quarter in equal installments of $9,375.

     11.  VI. DEFAULTS AND REMEDIES of this Agreement is amended to include
          Section 6.1(1) as follows:

          6.1 (1) At any time after September 30, 1999, the computer systems of
          the Borrower shall be unable to perform date-sensitive functions
          involving dates after December 31, 1999 and such inability has a
          material adverse effect on the ability of the Borrower to carry out
          its business.

     12.  Exhibits A, B and C to the Agreement are hereby amended and replaced
          as shown in Exhibits A, B and C to this Agreement.

     13.  On the date of this First Amendment, the Borrower shall execute and
          deliver to the Revolving Lenders revised Notes, such Notes to be
          substantially in the form shown on Exhibit A to this First Amendment
          in the amounts specified in Paragraph I above. Upon receipt of such
          revised Notes, the Revolving Lenders shall cancel and return to the
          Borrower the current Notes.

     14.  This First Amendment may be executed in several counterparts and such
          counterparts together shall constitute one and the same instrument.

     15.  On or prior to the date of this Agreement, the Borrower shall pay to
          Agent a closing fee of $37,500, which is equal to 15 basis points
          times the increase in the facility over $50,000,000. Such closing fee
          shall be remitted to the Revolving Lenders pro rata based on their
          respective percentages of such increase.




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     16.  For purposes of the Security Agreement and the Pledge Agreement, all
          references to the "Notes" shall mean the Notes issued under this First
          Amendment (and all notes given in substitution, renewal or replacement
          thereof), and all references to the "Revolving Credit Agreement" shall
          mean the Agreement as amended by this First Amendment and as
          subsequently amended from time to time by the parties in accordance
          with its terms. It is the intent of the parties to this First
          Amendment that the collateral granted under the Security Agreement and
          the Pledge Agreement shall secure the obligations created under the
          revised Notes issued pursuant to this First Amendment and the
          obligations of the Borrower under the Agreement as amended.

     17.  On or prior to the execution and delivery of this First Amendment, the
          Borrower shall deliver to Agent the following:

          a.   A certified copy of the Borrower's certificate of incorporation
               from the Secretary of the State of Delaware and a certificate of
               its corporate secretary evidencing the by-laws of the Borrower,
               corporate resolutions authorizing the transactions contemplated
               by this First Amendment, and the incumbency of the officers of
               the Borrower executing this First Amendment and the Notes; and

          b.   an opinion of special counsel to the Borrower substantially in
               the form attached to this First Amendment.

     Except as expressly agreed herein, all terms of the Agreement shall remain
in full force and effect.

     IN WITNESS WHEREOF, the Borrower and the Revolving Lenders have caused this
First Amendment To Revolving Credit Agreement to be executed by their duly
authorized corporate officers as of the day and year first above written.

                                 AMERITRADE HOLDING CORPORATION

                                 By:         /s/ R. T. Slezak
                                    ------------------------------------
                                   Title:    VP & CFO
                                         -------------------------------


                                 FIRST NATIONAL BANK OF OMAHA

                                 By:         /s/ James P. Bonham
                                    ------------------------------------
                                   Title:    Vice President
                                         -------------------------------

NOTICE: A credit agreement must be in writing to be enforceable under Nebraska
law. To protect you and us from any misunderstandings or disappointments, any
contract, promise, or offer to forebear repayment of money or to make any other
financial



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accommodation in connection with this loan of money or grant or extension of
credit, or any amendment of, cancellation of, waiver of, or substitution for any
or all of the terms or provisions of any instrument or document executed in
connection with this loan of money or grant or extension of credit, must be in
writing to be effective.

                                   INITIALED:   RTS
                                              --------
                                              Borrower





















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                                 LASALLE BANK, N.A.

                                 By:         /s/ [Illegible]
                                    ------------------------------------
                                   Title:    Vice President
                                         -------------------------------




NOTICE: A credit agreement must be in writing to be enforceable under Nebraska
law. To protect you and us from any misunderstandings or disappointments, any
contract, promise, undertaking, or offer to forebear repayment of money or to
make any other financial accommodation in connection with this loan of money or
grant or extension of credit, or any amendment of, cancellation of, waiver of,
or substitution for any or all of the terms or provisions of any instrument or
document executed in connection with this loan of money or grant or extension of
credit, must be in writing to be effective.

                                   INITIALED:

                                     RTS
                                   --------
                                   Borrower





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                                 MERCANTILE BANK OF ST. LOUIS, N.A.


                                 By:         /s/ Joseph L. Sooter, Jr.
                                    ------------------------------------
                                   Title:    Vice President
                                         -------------------------------




NOTICE: A credit agreement must be in writing to be enforceable under Nebraska
law. To protect you and us from any misunderstandings or disappointments, any
contract promise, undertaking, or offer to forebear repayment of money or to
make any other financial accommodation in connection with this loan of money or
grant or extension of credit, or any amendment of, cancellation of, waiver of,
or substitution for any or all of the terms or provisions of any instrument or
document executed in connection with this loan of money or grant or extension of
credit, must be in writing to be effective.

                                   INITIALED:

                                     RTS
                                   --------
                                   Borrower



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                                 HARRIS TRUST AND SAVINGS BANK


                                 By:         /s/ Gary R. Shafer
                                    ------------------------------------
                                   Title:    Vice President
                                         -------------------------------


NOTICE: A credit agreement must be in writing to be enforceable under Nebraska
law. To protect you and us from any misunderstandings or disappointments, any
contract, promise undertaking, or offer to forebear repayment of money or to
make any other financial accommodation in connection with this loan of money or
grant or extension of credit, or any amendment of, cancellation of, waiver of,
or substitution for any or all of the terms or provisions of any instrument or
document executed in connection with this loan of money or grant or extension of
credit, must be in writing to be effective.

                                   INITIALED:

                                     RTS
                                   --------
                                   Borrower




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                                    EXHIBIT A

                TO FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT
                                      AMONG
                         AMERITRADE HOLDING CORPORATION,
                          FIRST NATIONAL BANK OF OMAHA,
                         HARRIS TRUST AND SAVINGS BANK,
                              LASALLE BANK N.A. AND
                       MERCANTILE BANK OF ST. LOUIS, N.A.

                                FORM OF NEW NOTES




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                        SECURED BUSINESS PROMISSORY NOTE

Omaha, Nebraska                                 $_____________________
May __, 1999                                    December 31, 2000
(Note Date)                                     (Maturity Date)

     On or before December 31, 2000, AMERITRADE HOLDING CORPORATION ("Maker")
promises to pay to the order of [REVOLVING LENDER] ("Lender") the principal sum
hereof, which shall be the lesser of ___________ Dollars, or so much thereof as
may have been advanced by Lender pursuant to the Revolving Credit Agreement
dated as of January 16, 1998, as amended from time to time (the "Agreement")
among Maker, Lender, First National Bank of Omaha ("Agent"), and the other
Revolving Lenders from time to time party thereto (collectively, the "Lenders").
All capitalized terms not defined herein shall have their respective meanings as
set forth in the Agreement.

     Interest shall accrue on the principal sum hereof outstanding from time to
time at a floating per annum interest rate published from time to time as the
"Prime Rate" (the base rate on corporate loans posted by at least 75% of the
nation's 30 largest banks) in the Midwest Edition of the Wall Street Journal on
the date that the interest is billed (or, if no such rate is published on such
date, on the last preceding date when such rate was published), minus 3/4 of 1 %
(the "Revolving Credit Rate"). Interest shall accrue from and after the date of
advance to the date of repayment and shall be calculated based on a year of 360
days, and actual days elapsed. Such rate shall fluctuate daily based on changes
in such Prime Rate on such date. Notwithstanding anything to the contrary
elsewhere herein, after an Event of Default has occurred interest shall accrue
on the entire outstanding balance of principal and interest on all indebtedness
hereunder at a fluctuating rate equal to the Default Rate. Interest shall be due
no later then the tenth day of each month.

     On or prior to the end of each calendar quarter, Maker shall repay the
amount, if any, outstanding on the Revolving Credit Note which in the aggregate
exceeds the amount of the Base Revolving Credit Facility to be in place on the
next succeeding Business Day following such calendar quarter. The balance, if
any, shall be due on the Maturity Date stated above.

     All obligations of Maker under this Note shall be payable in immediately
available funds in lawful money of the United States of America at the principal
office of Agent in Omaha, Nebraska or at such other address as may be designated
by Agent in writing. In the event that a payment day is not a Business Day, the
payment shall be due on the next succeeding Business Day.

     Maker may at any time prepay the Principal Loan Amount outstanding under
this Note if Maker has given Agent and Lender at least one (1) Business Day's
prior written notice of its intention to make such prepayment. Any such
prepayment may be made without penalty.


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     All obligations of Maker hereunder shall be secured by a first security
interest in the Collateral, as more specifically described in the Security
Agreement and the Pledge Agreement.


                                  GENERAL TERMS

     Maker's liability for any amounts owed under this Note and the other
Operative Documents (the "Obligations') shall not be affected by any of the
following:

          Acceptance or retention by Lender or Agent of other property or
     interests as security for the Obligations, or for the liability of any
     person other than a Maker with respect to the Obligations;

          The release of all or any of the Collateral or other security for any
     of the Obligations to any Maker;

          Any release, extension, renewal, modification or compromise of any of
     the Obligations or the liability of any obligor thereon; or

          Failure by Lender or Agent to resort to other security or any person
     liable for any of the obligations before resorting to the Collateral.

     Neither Lender nor Agent is required to take any action whatsoever in
respect of the Collateral, Impairment or destruction of the Collateral shall not
release Maker of its liability hereunder.

     Upon the failure of Maker to make any payment of principal or interest when
due hereunder or the occurrence of any Event of Default, all of the Obligations
shall, at the option of Agent and without notice or demand, mature and become
immediately due and payable; and Agent shall have all rights and remedies for
default provided by the Uniform Commercial Code, any other applicable law and/or
the Operative Documents.

     All costs and expenses incurred by Lender or Agent in enforcing its rights
under this Note or any mortgage, endorsement, surety agreement, guaranty
relating thereto are the obligation of Maker and are immediately due and
payable. Interest shall accrue on such costs and expenses from the date of
incurrence at the rate specified herein for delinquent Note payments. Each
Maker, endorser, surety and guarantor hereby waives presentment, protest,
demand, notice of dishonor, and the defense of any statute of limitations.

     Without affecting the liability of any Maker, endorser, surety or
guarantor, the holder or Agent may, without notice, renew or extend the time for
payment, accept partial payments, release or impair any Collateral or other
security for the payment of this Note or agree to sue any party liable on it.



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     Neither Lender nor Agent shall be deemed to have waived any of its rights
upon or under this Note, or under any mortgage, endorsement, surety agreement or
guaranty, unless such waivers be in writing and signed by Lender or Agent, as
the case may be. No delay or omission on the part of Lender or Agent in
exercising any right shall operate as a waiver of such right or any other right.
A waiver on any one occasion shall not be construed as a bar to or waiver of any
right on any future occasion. All rights and remedies of Lender or Agent on
liabilities or the Collateral, whether evidenced hereby or by any other
instrument or papers, shall be cumulative and may be exercised or concurrently.

     Maker, if more than one, shall be jointly and severally liable hereunder
and all provisions hereof regarding the liabilities or security of Maker shall
apply to any liability or any security of any or all of them. This Note shall be
binding upon the heirs, executors, administrators, assigns or successors of
Maker; shall constitute a continuing agreement, applying to all future as well
as existing transactions, whether or not of the character contemplated at the
date of this Note, and if all transactions between Lender and Maker shall be at
any time closed, shall be equally applicable to any new transactions thereafter,
provided that Lender's interest in the Collateral shall be limited to the
extent provided in the Security Agreement and the Pledge Agreement; shall
benefit Lender, its successors and assigns; and shall so continue in force
notwithstanding any change in any partnership party hereto, whether such change
occurs through death, retirement or otherwise.

     All obligations of Maker hereunder shall be payable in immediately
available funds in lawful money of the United States of America at the principal
office of the Agent.

     This Note shall be construed according to the laws of the State of
Nebraska.

     Unless the context otherwise requires, all terms used herein which are
defined in the Uniform Commercial Code shall have the meanings therein stated.

     Any provision of this Note which is prohibited or unenforceable in any
jurisdiction shall, as to such jurisdiction, be ineffective to the extent of
such prohibition or unenforceability without invalidating the remaining
provisions hereof or affecting the validity or enforceability of such provision
in any other jurisdiction.

     This Note is given in substitution of that certain Secured Business
Promissory Note dated January ____, 1998, given by Maker to Lender, in the
principal amount of $___________________.

     Executed as of this _____ day of ________________, 1999.

                         AMERITRADE HOLDING CORPORATION


                               By:________________________________
                            Title:________________________________


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                            PROMISSORY NOTE SCHEDULE

                     Loan Advances and Payments of Principal

                         AMERITRADE HOLDING CORPORATION


REVOLVING NOTE ADVANCES AND PAYMENTS:


                         Amount of                        Unpaid
            Amount     Principal Paid      Amount of     Principal   Notation
Date      of Advance     or Prepaid      Interest Paid    Balance    Made By
- ----      ----------     ----------      -------------    -------    -------



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                                    EXHIBIT B

                TO FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT
                                      AMONG
                         AMERITRADE HOLDING CORPORATION,
                          FIRST NATIONAL BANK OF OMAHA,
                         HARRIS TRUST AND SAVINGS BANK,
                              LASALLE BANK N.A. AND
                       MERCANTILE BANK OF ST. LOUIS, N.A.

                               DRAWING CERTIFICATE




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                               DRAWING CERTIFICATE
                         AMERITRADE HOLDING CORPORATION

To induce the First National Bank of Omaha, and the other Revolving Lenders that
are parties to the Agreement referred to below (the "Revolving Lenders") to make
an Advance under the Revolving Credit Agreement (the "Agreement") dated as of
January 16, 1998, between the undersigned (the "Borrower") and the Revolving
Lenders, the Borrower hereby certifies to the Revolving Lenders that its
Annualized Modified Cash Flow (as defined in the Agreement) as represented below
are true and correct, that the Borrower's representations and warranties under
the Agreement remain true and correct and that there is no Event of Default or
condition or event which with the passage of time or the giving of notice or
both would constitute an Event of Default, and that there is no default under
the aforementioned Agreement.

All information as of: Date_____________

a) Maximum Revolving Credit Facility                     $______________*

b) Principal on Revolving Credit                         $______________

c) ADVANCE REQUEST                                       $______________

d) Total Proposed Bank Debt
   (line b + line c, but                                 $______________
   not to exceed line a)

e) Most recent Annualized Modified Cash Flow             $______________

f) 1.5 x Most recent Annualized Modified Cash Flow       $______________

g) $200 x Number of Core Retail Accounts                 $______________

h) Enter the smallest of lines (d), (f), and (g)         $______________

   *  The Maximum Revolving Credit Facility is as follows:

               Closing until June 30, 2000               $75,000,000
               July 1, 2000 - September 30, 2000         $71,875,000
               October 1, 2000 - December 31, 2000       $68,750,000

Name of Borrower: AmeriTrade Holding Corporation

Signature:     _____________________

Title:         _____________________


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                                    EXHIBIT C

                TO FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT
                                      AMONG
                         AMERITRADE HOLDING CORPORATION,
                          FIRST NATIONAL BANK OF OMAHA,
                         HARRIS TRUST AND SAVINGS BANK,
                             LASALLE BANK, N.A. AND
                       MERCANTILE BANK OF ST. LOUIS, N.A.

                             COMPLIANCE CERTIFICATE


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                             COMPLIANCE CERTIFICATE
                         AMERITRADE HOLDING CORPORATION


First National Bank of Omaha                              Date______________
Attn: James Bonham
16th & Dodge Streets
Omaha, Nebraska 68102

I certify that AmeriTrade Holding Corporation is in compliance with the
requirements set forth in the Revolving Credit Agreement (the "Agreement") dated
as of January 16, 1998, between the undersigned (the "Borrower") and the
Revolving Lenders.

The following calculations are as of ________ (statement date) as required by
Section 4.1(e) of said Agreement:

Evaluations:

Total Indebtedness (TI):

Annualized Modified Cash Flow for this Quarter:

                        month            month            month
                        ending______     ending______     ending______
  Consolidated
  Net Income (loss)
  Before Taxes          ____________     ____________     ____________

  Non-Ordinary
  Non-Cash
  Charges (Credits)     ____________     ____________     ____________

  Plus Advertising
   Expenditures in
   excess of $667,000
   for such month       ____________     ____________     ____________

  Total              a) ____________  b) ____________  c) ____________

  QAMCF = (a+b+c) x 4 = ____________


   21


Section 4.3

- - Net Worth:        The Borrower shall maintain a Minimum Net Worth during the
                    term of this Agreement of at least the amounts set forth
                    hereunder:


                                 Period Shown     Minimum Net Worth
                                 ------------     -----------------
          Prior to               12/31/99           $ 85,000,000
          After 12/31/99
          but on or prior
          to                     12/31/00           $100,000,000



- - Position:         Total Net Worth = $_____________

The Borrower [is/is not] in compliance with Section 4.3.

Section 4.4

- - Indebtedness:     At no time will Borrower: (1) have Indebtedness other then
                    as incurred under this Agreement or (2) have total
                    Indebtedness in excess of 3.0 times AMCF.

- - Position:         (1) Borrower [has/does not have] Indebtedness other than as
                    incurred under this Agreement;

                    (2) (3.0 x AMCF) - total Indebtedness =
                        ________ - ________ = ___________

Section 4.7

- - Distributions:    The Borrower shall not declare any dividends (other than
                    dividends payable in stock of the Borrower) or make any cash
                    distribution in respect of any shares of its capital stock
                    or warrants of its capital stock, without the prior written
                    consent of the Requisite Revolving Lenders.

The Borrower [is/is not] in compliance with Section 4.7.

Section 4.11

- - Guaranties:       The Borrower and its Subsidiaries shall not have outstanding
                    at any time guaranties in an aggregate amount exceeding
                    $250,000.

- - Position:         Aggregate amount of guaranties outstanding: $_____________

The Borrower [is/is not] in compliance with Section 4.11.


   22


Section 4.16

- - Capital Expenditures:  The Borrower shall not make capital expenditures in any
                         fiscal year, commencing with the fiscal year beginning
                         January 1, 1999, in excess of $50,000,000; provided
                         however that any portion of such $50,000,000 which is
                         not expanded for capital expenditures may be rolled
                         over and added to the capital expenditures for the next
                         fiscal year.

- - Position:              Amount of capital expenditures eligible to be rolled
                         over to this period:
                               $____________ + $50,000,000 = $______________

                         Capital Expenditures this fiscal year = $_____________

The Borrower [is/is not] in compliance with Section 4.16.


Section 4.17

- - Acquisitions           The Borrower shall not make acquisitions (other than
                         excepted acquisitions) which in the aggregate exceed
                         $5,000,000.

- - Position               Acquisitions in the aggregate since the date of the
                         Agreement = _______________.

The Borrower [is/is not] in compliance with Section 4.17.


Section 4.19

- - Minimum Regulatory
    Net Capital          AmeriTrade Clearing will have Regulatory Net Capital
                         not less than 5% of aggregate debit items.

- - Position:              Regulatory Net Capital: $__________________(_____%)
                         Aggregate Debit Items:  $__________________

The Borrower [is/is not] in compliance with Section 4.19.


Section 4.20

- - Minimum Core
    Retail Accounts      The Borrower will have at least the number of Core
                         Retail Accounts on the dates set forth below:

                              Date   Minimum Core Retail     Number of Core
                              ----   -------------------     --------------
                                          Accounts           Retail Accounts
                                          --------           ---------------


   23


                              Prior to      12/31/99    290,000   ___________

                              On or after   12/31/99    375,000   ___________

The Borrower [is/is not] in compliance with Section 4.20.

Additional Representations:

     There have/have not been any sale(s) of assets which would require
     prepayment of the Notes under Section 4.2.

     There has/has not been a Change of Control.


Name of Borrower:  AmeriTrade, Holding Corporation

Signature:         _______________________

Title:             _______________________


   24


                     [ LETTERHEAD OF MAYER, BROWN & PLATT ]

                                  May 25, 1999

To the Agent and the Revolving
       Lenders party to the Credit Agreement
       referred to below

       Re:  First Amendment, dated as of May 24, 1999, to the Revolving Credit
            Agreement, dated as of January 16, 1998, among AmeriTrade Holding
            Corporation, the financial institutions party thereto and First
            National Bank of Omaha, as agent

Ladies and Gentlemen:

       We have acted as special counsel to AmeriTrade Holding Corporation, a
Delaware corporation (the "Company"), in connection with the execution and
delivery of the First Amendment, dated as of May 24, 1999 (the "Amendment"), to
the Revolving Credit Agreement, dated as of January 16, 1998 (the "Credit
Agreement"), among the Company, the financial institutions party thereto (the
"Revolving Lenders") and First National Bank of Omaha, as agent (the "Agent").

       In connection with this opinion, we have examined:

       (a) the certificate of incorporation and bylaws of the Company;

       (b) resolutions of the board of directors of the Company;

       (c) the Amendment;

       (d) the Security Agreement dated as of January 16, 1998 (the "Security
           Agreement") between the Company and the Agent;

       (e) the Stock Pledge Agreement dated as of January 16, 1999 (the "Pledge
           Agreement") between the Company and the Agent;

       (f) the Secured Business Promissory Notes dated May 24, 1999 made by the
           Company to the order of the Revolving Lenders (the "Notes"); and


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MAYER, BROWN & PLATT

  May 25, 1999
  Page 2




       (g) the Credit Agreement

       We also have examined originals, or copies certified or otherwise
  identified to our satisfaction as being true copies, of such agreements,
  corporate records, certificates of public officials and other documents, as we
  have deemed necessary as a basis for the opinions hereinafter expressed. As to
  questions of fact material to such opinion, we have, when such facts were not
  independently established by us, relied upon certificates of the Company or
  its officers or of public officials.

       In our examination of the documents referred to above, we have assumed
  the authenticity of all such documents submitted to us as originals, the
  conformity to the originals of all such documents submitted to us as copies,
  the genuineness of all signatures, and the legal capacity and power of, and
  due authorization, execution and delivery of the Amendment and the Credit
  Agreement by, all parties other than the Company. Further, me have assumed
  that each of the Amendment, the Credit Agreement as amended by the Amendment
  (the "Amended Credit Agreement"), the Security Agreement and the Pledge
  Agreement constitutes the legal, valid and binding obligation of all parties
  thereto other than the Company.

       Based upon the foregoing and further subject to the qualifications set
  forth at the end of this opinion letter, we are of the opinion that:

       1. The Company is a validly existing corporation in good standing under
  the laws of the State of Delaware. For purposes of the opinion in this
  paragraph as to valid existence and good standing, we have relied exclusively
  upon a certificate issued by governmental authorities of the State of Delaware
  and such opinion is not intended to provide any conclusion or assurance beyond
  that conveyed by such certificate.

       2. The Company has the requisite corporate power and authority to execute
  and deliver the Amendment and the Notes and perform its obligations under the
  Notes and the Amended Credit Agreement. The execution and delivery of the
  Amendment and the Notes and the performance by the Company of its obligations
  under the Notes and the Amended Credit Agreement have been duly authorized by
  all necessary corporate action an the part of the Company. Each of the
  Amendment and the Notes has been duly executed by the Company.

       3. Each Note and the Amended Credit Agreement constitutes the legal,
  valid and binding obligation of the Company enforceable against the Company in
  accordance with its terms. Each of the Security Agreement and the Pledge
  Agreement constitutes the legal, valid and binding obligation of the Company,
  enforceable against the Company in accordance with its terms, and the Security
  Agreement and the Pledge Agreement secure the indebtedness of the Company
  under the Amended Credit Agreement and the Notes. In rendering the opinion in
  this



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MAYER, BROWN & PLATT

  May 25, 1999
  Page 3




  paragraph 3, we have assumed, with your permission, that the laws of the State
  of Illinois would govern the Notes, the Amended Credit Agreement, the Security
  Agreement and the Pledge Agreement (the "Documents") notwithstanding the
  selection of Nebraska law as the governing law of the Documents. In making the
  foregoing assumption, we do not intend to imply that an Illinois court would
  not give effect to such selection of Nebraska law.

        The opinions set forth above are subject to the following qualifications
        and limitations:

            (A) Our opinions stated herein are subject to the effect of any
        applicable bankruptcy, insolvency, fraudulent conveyance, equitable
        subordination, reorganization, readjustment of debt, moratorium or
        similar laws affecting creditors' rights generally.

            (B) Our opinions stated herein are further subject to the effect of
        general principles of equity, including, without limitation, concepts of
        materiality, reasonableness, good faith and fair dealing (regardless of
        whether considered in a proceeding in equity or at law) and by
        limitations on the availability of specific performance, injunctive
        relief or other equitable remedies.

            (C) We express no opinion as to the enforceability, under certain
        circumstances, of provisions imposing penalties or forfeitures, late
        payment charges or an increase in interest rate upon delinquency in
        payment or the occurrence of a default.

            (D) Certain of the remedial provisions contained in the Documents
        may be unenforceable in whole or in part but the inclusion of such
        provisions does not render the Documents invalid as a whole, and there
        exist, in the Documents or pursuant to applicable law, legally adequate
        remedies for the practical realization of the principal benefits
        purported to be afforded by such documents; (except for the economic
        consequences of procedural or other delay).

            (E) We express no opinion as to:

                (1) the existence of any person's or entity's ownership rights
            in or title to any collateral;

                (2) the validity, perfection, priority or enforceability of any
            lien, charge or encumbrance on or to any property or assets;

                (3) any agreement by the Company to submit to the jurisdiction
            of a particular court, waive jury trial or appoint an agent for
            acceptance of service of process;



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MAYER, BROWN & PLATT

  May 25, 1999
  Page 4




                (4) any provision purporting to waive any objection to the
            laying of venue or any claim that an action or proceeding has been
            brought in an inconvenient forum;

                (5) any provision of any Document which authorizes or permits
            any purchaser of a participation interest from any party to set off
            or apply any deposit or property or any indebtedness with respect to
            any participation interest;

                (6) compliance with, or any governmental or regulatory filing,
            approval, authorization, license or consent required by or under,
            any (a) Federal or state environmental laws, (b) Federal or state
            antitrust laws, (a) Federal or state taxation laws, (d) Federal or
            state worker health or safety, zoning or permitting or land use
            matters, (e) Federal or state patent, trademark or copyright
            statutes, rules or regulations, (f) statutory or other requirements
            relating to the disposition of hazardous waste or environmental
            protection, (g) Federal or state receivership or conservatorship
            laws, (h) securities registration or antifraud provisions under
            Federal or state securities laws, (i) Federal or state labor or
            employment law or (j) Federal or state employee benefits or pension
            law;

                (7) the effect of the law of any jurisdiction wherein any
            Revolving Lender may be located or wherein the enforcement of any
            Document may be sought that limits the rates of interest legally
            chargeable or collectible; and

                (8) any provision of any Document (i) restricting access to
            legal or equitable remedies, (ii) purporting to establish
            evidentiary standards, (iii) purporting to appoint any person or
            entity as the attorney-in-fact of any other person or entity, (iv)
            which provides that the Documents may only be amended, modified or
            waived in writing or (v) stating that all rights or remedies of any
            party are cumulative and may be enforced in addition to any other
            right or remedy and that the election of a particular remedy does
            not preclude recourse to one or more remedies.

            (F) We note that the enforceability of the Documents may be limited
        or rendered ineffective if the Agent or the Revolving Lenders fail to
        act in good faith and in a commercially reasonable manner in seeking to
        exercise their rights and remedies thereunder. Without limiting the
        generality of the foregoing, we note that a court might hold that a
        technical and nonmaterial default under the Documents does not give rise
        to a right of the Agent or the Revolving Lenders to exercise certain
        remedies including, without limitation, acceleration.


   28


MAYER, BROWN & PLATT

  May 25, 1999
  Page 5




            (G) We express no opinion as to the enforceability of the
        indemnification provisions of the Documents insofar as said provisions
        contravene public policy or might require indemnification or payments to
        any person or entity with respect to any litigation determined adversely
        to such person or entity, or any loss, cost or expense arising out of
        the gross negligence or willful misconduct of such person or entity or
        any violation by such person or entity of statutory duties, general
        principles of equity or public policy.

            (H) No opinion is rendered herein as to the effect of any law
        relating to your legal or regulatory status.

            (I) We have assumed that there are no agreements or understandings
        among the parties, written or oral, and there is no usage of trade or
        prior course of dealing among the parties, that would supplement or
        modify the terms of any Document.

        This opinion is being delivered to you pursuant to Section 17.b of the
  Amendment, is rendered solely to and for your benefit and may not be relied
  upon for any other purpose, or relied upon by any other person, firm or
  corporation for any purpose, without our prior written consent.
  Notwithstanding the foregoing, assignees of Revolving Lenders who become
  Revolving Lenders under the Amended Credit Agreement and participants
  permitted under the Amended Credit Agreement may rely on this opinion as if it
  were addressed to them.

        We are members of the Bar of the State of Illinois. This opinion is
  limited to the law of such state, the federal laws of the United States and
  the General Corporation Law of the State of Delaware. With respect to opinions
  contained herein on matters governed by the General Corporation Law of the
  State of Delaware, you are aware that we are not admitted to the Bar of the
  State of Delaware and that such opinions are based solely upon our familiarity
  with the General Corporation Law of the State of Delaware as a result of our
  prior involvement in transactions of a nature similar to those contemplated by
  the Documents. The opinions expressed herein are limited in all respects to
  the law existing on the date hereof. In rendering this opinion, we do not
  undertake to advise you of any change in law or fact that may occur after the
  date hereof.

                                   Very truly yours,

                                   /s/ Mayer, Brown & Platt

                                   MAYER, BROWN & PLATT