Document:

<PAGE>
                                                                    EXHIBIT 10.4

(MULTICURRENCY--CROSS BORDER)                                     EXECUTION COPY
                                                                  CB03-655D

                                    (ISDA LOGO)

                                MASTER AGREEMENT

                          dated as of November 1, 2001

     CITIBANK, N.A.                                     AND   AMERITRADE HOLDING
                                                              CORPORATION

have entered and/or anticipate entering into one or more transactions (each a
"Transaction") that are or will be governed by this Master Agreement, which
includes the schedule (the "Schedule"), and the documents and other confirming
evidence (each a "Confirmation") exchanged between the parties confirming those
Transactions.

Accordingly, the parties agree as follows: --

1.   INTERPRETATION

(a)  DEFINITIONS. The terms defined in Section 14 and in the Schedule will have
the meanings therein specified for the purpose of this Master Agreement.

(b)  INCONSISTENCY. In the event of any inconsistency between the provisions of
the Schedule and the other provisions of this Master Agreement, the Schedule
will prevail. In the event of any inconsistency between the provisions of any
Confirmation and this Master Agreement (including the Schedule), such
Confirmation will prevail for the purpose of the relevant Transaction.

(c)  SINGLE AGREEMENT. All Transactions are entered into in reliance on the
fact that this Master Agreement and all Confirmations form a single agreement
between the parties (collectively referred to as this "Agreement"), and the
parties would not otherwise enter into any Transactions.

2.   OBLIGATIONS

(a)  GENERAL CONDITIONS.

     (i) Each party will make each payment or delivery specified in each
     Confirmation to be made by it, subject to the other provisions of this
     Agreement.

     (ii) Payments under this Agreement will be made on the due date for value
     on that date in the place of the account specified in the relevant
     Confirmation or otherwise pursuant to this Agreement, in freely
     transferable funds and in the manner customary for payments in the required
     currency. Where settlement is by delivery (that is, other than by payment),
     such delivery will be made for receipt on the due date in the manner
     customary for the relevant obligation unless otherwise specified in the
     relevant Confirmation or elsewhere in this Agreement.

     (iii) Each obligation of each party under Section 2(a)(i) is subject to (1)
     the condition precedent that no Event of Default or Potential Event of
     Default with respect to the other party has occurred and is continuing, (2)
     the condition precedent that no Early Termination Date in respect of the
     relevant Transaction has occurred or been effectively designated and (3)
     each other applicable condition precedent specified in this Agreement.

<PAGE>
value of that which was (or would have been) required to be delivered as of the
originally scheduled date for delivery, in each case together with (to the
extent permitted under applicable law) interest, in the currency of such
amounts, from (and including) the date such amounts or obligations were or
would have been required to have been paid or performed to (but excluding) such
Early Termination Date, at the Applicable Rate. Such amounts of interest will
be calculated on the basis of daily compounding and the actual number of days
elapsed. The fair market value of any obligation referred to in clause (b)
above shall be reasonably determined by the party obliged to make the
determination under Section 6(e) or, if each party is so obliged, it shall be
the average of the Termination Currency Equivalents of the fair market values
reasonably determined by both parties.

IN WITNESS WHEREOF the parties have executed this document on the respective
dates specified below with effect from the date specified on the first page of
this document.

CITIBANK, N.A.                           AMERITRADE HOLDING CORPORATION

By: /s/ LINDA K. COOK                    By: /s/ WILLIAM J. GERBER
    --------------------------               --------------------------
    Name: Linda Cook                         Name: William J. Gerber
    Title: Vice President                    Title: Managing Director of Finance
    Date: Citibank, N.A.                     Date: 08/29/02
          250 West Street/10th Fl.
          New York, New York 10013

                                       18
<PAGE>
                                                                  EXECUTION COPY
                                                                  REF: CB03-655A

                                    SCHEDULE

                                     to the

                             ISDA Master Agreement

                     dated as of November 1, 2001, between

                                CITIBANK, N.A.,
  a national banking association organized under the laws of the United States
                                  ("Party A")

                                      and

                        Ameritrade Holding Corporation,
                      a corporation organized and existing
                           under the laws of Nebraska
                                  ("Party B")

                                     Part 1

                             Termination Provisions

In this Agreement:

         (a) "SPECIFIED ENTITY" means for the purpose of Section 5(a)(v) of
this Agreement, (i) in relation to Party A, Salomon Brothers International
Limited, Salomon Brothers AG, Salomon Smith Barney Inc., Salomon Forex Inc,
Smith Barney Capital Services Inc., Smith Barney Commercial Corporation and
Salomon Brothers Holding Company Inc (individually a "Section 5(a)(v)
Affiliate"), and (ii) in relation to Party B, not applicable.

         (b) "SPECIFIED TRANSACTION" will have the meaning specified in Section
14 of this Agreement. For purposes of clause (c) of such definition, Specified
Transaction includes any securities lending agreement, securities options,
margin loans, short sales, repurchase agreement, reverse repurchase agreement
and forward securities contract, and any other similar transaction now existing
or hereafter entered into between Party A (or any Section 5(a)(v) Affiliate)
and Party B, not applicable.

                                       1
<PAGE>
     (c) The "CROSS DEFAULT" provisions of Section 5(a)(vi) will apply to Party
A and will apply to Party B.

     For purposes of Section 5(a)(vi), the following provisions apply:

     "SPECIFIED INDEBTEDNESS" means, instead of the definition thereof in
     Section 14 of this Agreement, any obligation (whether present or future,
     contingent or otherwise, as principal or surety or otherwise) in respect of
     (i) borrowed money, or (ii) any transaction with any party of the type
     referred to in subparagraphs (a), (b) or (c) of the definition of Specified
     Transaction; provided, however, that Specified Indebtedness shall not
     include deposits received in the course of a party's ordinary banking
     business.

     For the purpose of Section 5(a)(vi)(1):

               (a) Any reference to Specified Indebtedness becoming, or becoming
          capable of being declared, due and payable shall in the case of
          Specified Indebtedness which is a Transaction with any party of the
          type referred to in subparagraphs (a), (b) or (c) of the definition of
          Specified Transaction, be deemed to be a reference to Specified
          Indebtedness being, or becoming capable of being, terminated,
          liquidated, accelerated or cancelled by reason of a default by a party
          to such Transaction; and

               (b) in determining the amount to be included in "Threshold
          Amount" with respect to Specified Indebtedness which is a Transaction
          with any party of the type referred to in subparagraphs (a), (b) or
          (c) of the definition of Specified Transaction, the termination or
          settlement value of such transaction shall be used or, if it is not
          available, the Non-defaulting Party shall determine the settlement
          amount of such transaction in good faith on the basis of the
          information available to it.

     "THRESHOLD AMOUNT" means

     (A)  with respect to Specified Indebtedness in respect of borrowed money:

          (i) with respect to Party A, 2% of the stockholders' equity of Party
              A; and

          (ii) with respect to Party B or any Credit Support Provider, $0.

     (B)  with respect to Specified Indebtedness which is a transaction referred
          to in subparagraphs (a), (b) or (c) of the definition of Specified
          Transaction:

          (i) with respect to Party A, 2% of stockholders' equity; and

          (ii) with respect to Party B, 1% of stockholders' equity.

                                       2
<PAGE>
          Including, in the case of (A) and (B) above, the U.S. Dollar
          equivalent on the date of any event of default of any obligation
          stated in any other currency.

          For purposes of the above, stockholders' equity shall be determined by
          reference to the relevant party's most recent consolidated (quarterly,
          in the case of a U.S. incorporated party) balance sheet and shall
          include, in the case of a U.S. incorporated party, legal capital,
          paid-in capital, retained earnings and cumulative translation
          adjustments. Such balance sheet shall be prepared in accordance with
          accounting principles that are generally accepted in such party's
          country of organization.

          (d) The "CREDIT EVENT UPON MERGER" provisions of Section 5(b)(iv) of
this Agreement will apply to Party A and will apply to Party B.

For purposes of this Agreement Section 5(b)(iv) is hereby amended by:

     (i) inserting after the phrase "Section 5(a)(viii)" on line 4 thereof the
     phrase "or any person or entity acquires directly or indirectly the
     beneficial ownership of equity securities having the power to elect a
     majority of the Board of Directors or other managing body of X, any Credit
     Support Provider of X or any applicable Specified Entity of X, or X, and
     Credit Support Provider of X or any applicable Specified Entity of X
     effects any substantial change in its capital structure by means of the
     issuance, incurrence or guarantee of debt or the issuance of preferred
     stock or other securities convertible into, or exchangeable for, debt or
     preferred stock; or X, any Credit Support Provider of X or any applicable
     Specified Entity of X enters into any agreement providing for any of the
     foregoing"

     (ii) deleting the word "or" appearing after the words "resulting,
     surviving" on line 5 thereof and inserting a comma in lieu thereof, and

     (iii) inserting the phrase ", reorganized immediately after the word
     "transferee" on line 5 thereof.

          (e) The "AUTOMATIC EARLY TERMINATION" provisions of Section 6(a) will
not apply to Party A and will not apply to Party B; provided, however, that
with respect to a party, where the Event of Default specified in Section
5(a)(vii)(1), (3), (4), (5), (6) or to the extent analogous thereto, (8) is
governed by a system of law which does not permit termination to take place
after the occurrence of the relevant Event of Default, then the Automatic Early
Termination provisions of Section 6(a) will apply to such party.

          (f) For the purpose of the "PAYMENTS ON EARLY TERMINATION" provisions
of Section 6(e):

               (i) The Second Method will apply; and

                                       3
<PAGE>

                    (ii) Market Quotation will apply.

               (g)  "TERMINATION CURRENCY" means United States Dollars.

               (h)  "ADDITIONAL TERMINATION EVENT".

     (i)       Section 5(b) of the Agreement is modified by adding at the end
               thereof the following subsection (vi):

               (vi)      Impossibility. Due to the occurrence of a natural or
                         man-made disaster, armed conflict, act of terrorism,
                         riot, labor disruption or any other circumstance beyond
                         its control after the date on which a Transaction is
                         entered into, it becomes impossible (other than as a
                         result of its own misconduct) for such a party:

                         (1)  to perform any absolute or contingent obligation,
                              to make a payment or delivery or to receive a
                              payment or delivery in respect of such Transaction
                              or to comply with any other material provision of
                              this Agreement relating to such Transaction; or

                         (2)  to perform, or for any Credit Support Provider of
                              such party to perform, any contingent or other
                              obligation which the party (or such Credit Support
                              Provider) has under any Credit Support Document
                              relating to such Transaction.

     (ii)      For the purposes of Section 6, in the event of an Impossibility,
               both parties shall be Affected Parties.

     (iii)     An Impossibility shall be treated as an Illegality for purposes
               of Section 5(c) of the Agreement.

     (iv)      The definition of "Affected Transactions" in Section 14 of the
               Agreement is hereby amended by inserting "Impossibility,"
               immediately after "an Illegality,".

                                       4
<PAGE>
                                     Part 2

                              Tax Representations

                  (a) PAYER REPRESENTATIONS. For the purpose of Section 3(e) of
this Agreement, Party A will make the following representation and Party B will
make the following representation:

It is not required by any applicable law, as modified by the practice of any
relevant governmental revenue authority, of any Relevant Jurisdiction to make
any deduction or withholding for or on account of any Tax from any payment
(other than interest under Section 2(e), 6(d)(ii) or 6(e) of this Agreement) to
be made by it to the other party under this Agreement. In making this
representation, it may rely on (i) the accuracy of any representations made by
the other party pursuant to Section 3(f) of this Agreement, (ii) the
satisfaction of the agreement contained in Section 4(a)(i) or 4(a)(iii) of this
Agreement and the accuracy and effectiveness of any document provided by the
other party pursuant to Section 4(a)(i) or 4(a)(iii) of this Agreement and (iii)
the satisfaction of the agreement of the other party contained in Section 4(d)
of this Agreement, provided that it shall not be a breach of this representation
where reliance is placed on clause (ii) and the other party does not deliver a
form or documents under Section 4(a)(iii) by reason of material prejudice to its
legal or commercial position.

                  (b) PAYEE REPRESENTATIONS. For the purpose of Section 3(f) of
the Agreement, Party A and Party B make the representations specified below, if
any:

         The following representation will apply to Party A:

         It is a national banking association organized under the laws of the
         United States and its U.S. taxpayer identification number is
         13-5266470.

         The following representation will apply to Party B:

         It is a corporation created or organized in the United States or under
         the laws of the United States or of any State and its U.S. taxpayer
         identification number is 47-06-42-657.

                                     Part 3

                         Agreement to Deliver Documents

               For the purpose of Section 4(a) of this Agreement:

                  1. Tax forms, documents or certificates to be delivered are:

                                       5
<PAGE>
 <Table>
<Caption>
   Party required to                  Form/Document/                       Date by which to
   deliver document                    Certificate                           be delivered
-----------------------               --------------                -------------------------------
<S>                                   <C>                           <C>
(i) Party A and Party B               IRS Form W-9                  Promptly upon execution of this
                                                                    Agreement; and promptly upon
                                                                    learning that any form
                                                                    previously provided by Party B
                                                                    has become obsolete or
                                                                    incorrect.

</Table>

          II.  Other documents to be delivered are:

<Table>
<Caption>
Party required
to deliver               Form/Document/                Date by which to              Covered by
document                 Certificate                   to be delivered               Section 3(d)
-----------------------------------------------------------------------------------------------------------
<S>                      <C>                           <C>                           <C>

(a) Party A and          Evidence reasonably           As soon as practicable        Yes
    Party B              satisfactory to the other     after execution of this
                         party of the (i) authority    Agreement and any
                         of such party and any         Credit Support Document
                         Credit Support Provider to    and, if requested by
                         enter into the Agreement      the other party, as
                         and any Credit Support        soon as practicable
                         Document and any              after execution of any
                         Transactions and (ii) the     Confirmation of any
                         authority and genuine         other Transaction.
                         signature of the
                         individual signing the
                         Agreement and any Credit
                         Support Document on behalf
                         of such party to execute
                         the same.

(b) Party A and          Credit Support Document(s)    Upon execution of this        No
    Party B                                            Agreement
</Table>

                                       6

<PAGE>
<Table>
<Caption>
Party required
to deliver               Form/Document/                Date by which to              Covered by
document                 Certificate                   to be delivered               Section 3(d)
-----------------------------------------------------------------------------------------------------------
<S>                      <C>                           <C>                           <C>

(c) Party B              The party's Annual            As soon as available          Yes
                         Report containing             and in any event within
                         audited consolidated          120 days (or as soon as
                         financial statements          practicable after
                         certified by                  becoming publicly
                         independent certified         available) after the end
                         public accountants for        of each of its fiscal
                         each fiscal year.             years.

(d) Party B              The party's unaudited         As soon as available          Yes
                         consolidated financial        and in any event within
                         statements, the               60 days (or as soon as
                         consolidated balance          practicable after
                         sheet and related             becoming publicly
                         statements of income          available) after the end
                         for each fiscal quarter.      of each of its fiscal
                                                       quarters.
</Table>

                                     Part 4

                                 Miscellaneous

          (a)  ADDRESSES FOR NOTICES. For the purposes of Section 12(a) of this
Agreement:

ADDRESS FOR NOTICES OR COMMUNICATIONS TO PARTY A:

With respect to a particular Transaction, all notices or communications to
Party A shall be sent to the address or facsimile number indicated in the
Confirmation of that Transaction.

In addition, in the case of notices or communications relating to Section 5, 6,
11 or 13 of this Agreement, a copy of any such notice or communication shall be
addressed to the attention of Party A's legal department as follows:

                                       7

<PAGE>

Address:       Capital Markets Legal Department
               250 West Street
               New York, New York 10013

Attention:     Department Head

ADDRESS FOR NOTICES OR COMMUNICATIONS TO PARTY B:

Address:       Ameritrade Holding Corporation
               4211 South 102nd St.
               Omaha, Nebraska
               68127

Attention:     Mr. Randy MacDonald
               Chief Financial Officer, Treasurer
Facsimile No:  402-827-8663
Telephone No:  402-597-7781

WITH A COPY TO:

Ms. Ellen Koplow
General Counsel
132 Business Parkway
Annapolis Junction, MD
20701

Facsimile No:  240-568-3530
Telephone No:  240-568-3530

               (b)  EFFECTIVENESS OF NOTICE. Section 12(a) is hereby amended by
deleting the words "facsimile transmission or" in line 3 thereof.

               (c)  PROCESS AGENT. For the purpose of Section 13(c) of this
Agreement:

                    Party B appoints as its Process Agent: NOT APPLICABLE

               (d)  OFFICES. The provisions of Section 10(a) will apply to this
Agreement.

               (e)  MULTIBRANCH PARTY. For the purpose of Section 10(c) of this
Agreement.

                    Party A is a Multibranch Party and may act through any of
                    the following offices: New York, London and Tokyo.

                                       8

<PAGE>

               Party B is not a Multibranch Party.

          (f)  CALCULATION AGENT. The Calculation Agent will be Party A unless
otherwise specified in a Confirmation in reference to the relevant Transaction,
provide however if an Event of Default or Termination Event has occurred with
respect to Party A, then Party B shall be Calculation Agent.

          (g)  CREDIT SUPPORT DOCUMENT. Details of any Credit Support Document:

               The Credit Support Document is the Credit Support Annex between
               Party A and Party B substantially in the form of Exhibit III.

          (h)  CREDIT SUPPORT PROVIDER. Credit Support Provider means in
relation to Party A, not applicable. Credit Support Provider means in relation
to Party B, not applicable.(i)

          (i)  GOVERNING LAW. THIS AGREEMENT WILL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO
CHOICE OF LAW DOCTRINE.

          (j)  JURISDICTION. Section 13(b) of the Agreement is hereby amended
by (i) deleting the word "non-" in line 2 of subsection 13(b)(i) and (ii)
deleting the final paragraph thereof and replacing it with the following:
"Nothing in this provision shall prohibit a party from bringing an action to
enforce a money judgment in any other jurisdiction."

          (k)  "AFFILIATE" will have the meaning specified in Section 14 of
this Agreement.

          (l)  "NETTING OF PAYMENTS" Either party may notify the other in
writing, not less than one Local Business Day in advance of a Scheduled Payment
Date, that with regard to payments due on that date, subparagraph (ii) of
Section 2(c) of this Agreement will not apply. Except to the extent that such
advance written notice shall have been given, subparagraph (ii) of Section 2(c)
will apply.

                                     Part 5
                                Other Provisions

          (a)  SET-OFF. Section 6 of the Agreement is amended by adding the
following new subsection 6(f):

     (f) In addition to any rights of set-off a party may have as a matter of
     law or otherwise, upon the occurrence of an Event of Default with respect
     to a party ("X") the other party ("Y") will have the right (but will not be
     obliged) without prior notice to X or any other person to set-off any
     obligation of X owing to Y (whether or not arising under this Agreement,
     whether or not matured, whether or not contingent and regardless of the

                                       9

<PAGE>
     currency, place of payment or booking office of the obligation) against any
     obligation of Y owing to X (whether or not arising under this Agreement,
     whether or not matured, whether or not contingent and regardless of the
     currency, place of payment or booking office of the obligation).

     For the purpose of cross-currency set-off, Y may convert any obligation to
     another currency at a market rate determined by Y.

     If an obligation is unascertained, Y may in good faith estimate that
     obligation and set-off in respect of the estimate, subject to the relevant
     party accounting to the other when the obligation is ascertained.

     Nothing in this provision will be deemed to create a charge or other
     security interest.

          (b) WAIVER OF RIGHT TO TRIAL BY JURY. Each party hereby irrevocably
waives, to the fullest extent permitted by applicable law, any right it may have
to a trial by jury in respect of any suit, action or proceeding relating to this
Agreement or any Credit Support Document.

          (c) SEVERABILITY. In the event that any one or more of the provisions
contained in this Agreement should be held invalid, illegal, or unenforceable in
any jurisdiction, the validity, legality and enforceability of the remaining
provisions contained herein shall not in any way be affected or impaired
thereby. The parties shall endeavor, in good faith negotiations, to replace the
invalid, illegal or unenforceable provisions with valid provisions, the economic
effect of which comes as close as possible to that of the invalid, illegal or
unenforceable provisions.

          (d) NETTING. In the event that any Terminated Transaction cannot be
aggregated and netted against all other Terminated Transactions under Section
6(e) of the Agreement, such excluded Terminated Transactions shall be aggregated
and netted amongst themselves to the fullest extent permitted by law.

          (e) ADDITIONAL REPRESENTATIONS. For purposes of Section 3 of this
Agreement, the following shall be added, immediately following paragraph (f)
thereof:

          (g) NO RELIANCE. It is acting for its own account, and it has made its
          own independent decisions to enter into that Transaction and as to
          whether that Transaction is appropriate or proper for it based upon
          its own judgment and upon advice from such advisors as it has deemed
          necessary. It is not relying on any communication (written or oral) of
          the other party as investment advice or as a recommendation to enter
          into that Transaction; it being understood that information and
          explanations related to the terms and conditions of a Transaction
          shall not be considered investment advice or a recommendation to enter
          into that Transaction. It has not received from the other party any
          assurance or guarantee as to the expected results of that Transaction.

                                       10
<PAGE>
         (h) EVALUATION AND UNDERSTANDING. It is capable of evaluating and
         understanding (on its own behalf or through independent professional
         advice), and understands and accepts, the terms, conditions and risks
         of that Transaction. It is also capable of assuming, and assumes, the
         financial and other risks of that Transaction.

         (i) STATUS OF PARTIES. The other party is not acting as a fiduciary or
         an advisor for it in respect of that Transaction.

         (j) NO AGENCY. It is entering into this Agreement, and Credit Support
         Document to which it is a party and each Transaction as principal and
         not as agent.

         (k) RISK MANAGEMENT/LINE OF BUSINESS. Party B alone represents that
         this Agreement has been, and each Transaction hereunder has been or
         will be, as the case may be, entered into for the purpose of managing
         its borrowings or investments, hedging its underlying assets or
         liabilities or in connection with its line of business (including
         financial intermediation services) and not for the purpose of
         speculation.

         (l) ELIGIBLE CONTRACT PARTICIPANT. (a) It is an "eligible contract
         participant" within the meaning of Section 1(a)(12) of the Commodity
         Exchange Act, as amended (the "CEA"), (b) this Agreement and each
         Transaction is subject to individual negotiation by each party, and (c)
         neither this Agreement nor any Transaction will be executed or traded
         on a "trading facility" within the meaning of Section 1a(33) of the
         CEA.

         (f) CONFIRMATION PROCEDURES. For each Transaction that Party A and
Party B enter hereunder, Party A shall promptly send to Party B a Confirmation
setting forth the terms of such Transaction. Party B shall execute and return
the Confirmation to Party A or request correction of any error within ten (10)
Business Days of receipt. Failure of Party B to respond within such period
shall not affect the validity or enforceability of such Transaction.

         (g) EMU PROTOCOL. The parties agree that the definitions and
provisions contained in Annexes 1 to 5 and Section 6 of the EMU Protocol
published by the International Swaps and Derivatives Association, Inc. on 6th
May, 1998 are incorporated into and apply to this Agreement.

         (h) ESCROW PAYMENTS. If by reason of the time difference between the
cities in which payments are to be made, it is not possible for simultaneous
payments to be made on any date on which both parties are required to make
payments hereunder, either party may at its option and in its sole discretion
notify the other party that payments on that date are to be made in escrow. In
this case the deposit of the payment due earlier on that date shall be made by
2:00 p.m. (local time at the place for the earlier payment) on that date with
an escrow agent selected by the party giving the notice, accompanied by
irrevocable payment instructions (i) to release the

                                       11
<PAGE>
deposited payment to the intended recipient upon receipt by the escrow agent of
the required deposit of the corresponding payment from the other party on the
same date accompanied by the irrevocable payment instructions to the same
effect or (ii) if the required deposit of the corresponding payment is not made
on that same date, to return the payment deposited to the party that paid it
into escrow. The party that elects to have payments made in escrow shall pay
the costs of the escrow arrangements and shall cause those arrangements to
provide that the intended recipient of the payment due to be deposited first
shall be entitled to interest on that deposited payment for each day in the
period of its deposit at the rate offered by the escrow agent for that day for
overnight deposits in the relevant currency in the office where it holds that
deposited payment (at 11:00 am. local time on that day) if that payment is not
released by 5:00 p.m. on the date it is deposited for any reason other than the
intended recipients' failure to make the escrow deposit it is required to make
hereunder in a timely fashion.

          (i)  NOTICE OF EVENTS OF DEFAULT.

               (i) Each party agrees, upon learning of the occurrence of any
     event or commencement of any condition that constitutes (or that with the
     giving of notice or passage of time or both would constitute) an Event of
     Default or Termination Event with respect to such party, promptly to give
     the other party notice of such event or condition (or, in lieu of giving
     notice of such event or condition in the case of an event or condition
     that with the giving of notice or passage of time or both would constitute
     an Event of Default or Termination Event with respect to the party, to
     cause such event or condition to cease to exist before becoming an Event of
     Default or Termination Event).

          (j)  RECORDING OF CONVERSATIONS. Each party hereto consents to the
recording of its telephone conversations pursuant to this Agreement. To the
extent that one party records telephone conversations (the "Recording Party")
and the other party does not (the "Non-Recording Party"), the Recording Party
shall, in the event of any dispute, make a complete and unedited copy of such
party's tape of the entire day's conversations with the Non-Recording Party's
personnel available to the Non-Recording Party. The Recording Party's tapes
may be used by either party in any forum in which a dispute is sought to be
resolved and the Recording Party will retain tapes for a consistent period of
time in accordance with the Recording Party's policy unless one party notifies
the other that a particular transaction is under review and warrants further
retention.

                                       12
<PAGE>
IN WITNESS WHEREOF the parties have executed this document on the respective
dates specified below with effect from the date specified on the first page of
this document.

CITIBANK, N.A.                               AMERITRADE HOLDING
                                             CORPORATION

By: /s/ LINDA COOK                           By: /s/ WILLIAM J. GERBER
    ------------------------------               -------------------------------

Print Name: Linda Cook                       Print Name: William J. Gerber
            ----------------------                       -----------------------

Title: Vice President                        Title: Managing Director of Finance
       ---------------------------                  ----------------------------
       Citibank, N.A.
       250 West Street/10th Fl.
       New York, New York 10013

Date:                                        Date: 08/29/02
      ----------------------------                 -----------------------------

                                       13<PAGE>
                                                                    EXHIBIT 10.5

                                  (ISDA LOGO)

                              CREDIT SUPPORT ANNEX

                             to the Schedule to the

                                Master Agreement
--------------------------------------------------------------------------------

                          dated as of November 1, 2001

                                    between

CITIBANK N.A.                               AMERITRADE HOLDING
                                            CORPORATION
----------------------------------   and    ------------------------------------
           ("Party A")                                  ("Party B")

This Annex supplements, forms part of, and is subject to, the above-referenced
Agreement, is part of its Schedule and is a Credit Support Document under this
Agreement with respect to each party.

Accordingly, the parties agree as follows: --

PARAGRAPH 1. INTERPRETATION

(a)  DEFINITIONS AND INCONSISTENCY. Capitalized terms not otherwise defined
herein or elsewhere in this Agreement have the meanings specified pursuant to
Paragraph 12, and all references in this Annex to Paragraphs are to Paragraphs
of this Annex. In the event of any inconsistency between this Annex and the
other provisions of this Schedule, this Annex will prevail, and in the event of
any inconsistency between Paragraph 13 and the other provisions of this Annex,
Paragraph 13 will prevail.

(b) SECURED PARTY AND PLEDGOR. All references in this Annex to the "Secured
Party" will be to either party when acting in that capacity and all
corresponding references to the "Pledgor" will be to the other party when acting
in that capacity; provided, however, that if Other Posted Support is held by a
party to this Annex, all references herein to that party as the Secured Party
with respect to that Other Posted Support will be to that party as the
beneficiary thereof and will not subject that support or that party as the
beneficiary thereof to provisions of law generally relating to security
interests and secured parties.

PARAGRAPH 2. SECURITY INTEREST

Each party, as the Pledgor, hereby pledges to the other party, as the Secured
Party, as security for its Obligations, and grants to the Secured Party a first
priority continuing security interest in, lien on and right of Set-off against
all Posted Collateral Transferred to or received by the Secured Party
hereunder. Upon the Transfer by the Secured Party to the Pledgor of Posted
Collateral, the security interest and lien granted hereunder on that Posted
Collateral will be released immediately and, to the extent possible, without
any further action by either party.

<PAGE>
                                                                  EXECUTION COPY
                                                                       CB03-655B

PARAGRAPH 13. ELECTIONS AND VARIABLES

(a)  SECURITY INTEREST FOR "OBLIGATIONS". The term "OBLIGATIONS" as used in
     this Annex includes no additional obligations with respect to Party A and
     Party B.

(b)  CREDIT SUPPORT OBLIGATIONS.

     (i)  Delivery Amount, Return Amount and Credit Support Amount.

          (A)  "DELIVERY AMOUNT" has the meaning specified in Paragraph 3(a).

          (B)  "RETURN AMOUNT" has the meaning specified in Paragraph 3(b).

          (C)  "CREDIT SUPPORT AMOUNT" has the meaning specified in Paragraph 3.

     (ii) ELIGIBLE COLLATERAL. The following items will qualify as "ELIGIBLE
          COLLATERAL" for the party specified:

<Table>
<Caption>
                                                                    PARTY     PARTY     VALUATION
                                                                      A         B      PERCENTAGE
<S>                                                                 <C>       <C>      <C>
          (A)  Cash                                                   X         X         100%

          (B)  negotiable debt obligations issued by the U.S.         X         X         100%
               Treasury Department having a remaining maturity
               at issuance of less than one year

          (C)  negotiable debt obligations issued by the U.S.         X         X          98%
               Treasury Department having a remaining maturity
               at issuance of at least one year but less than
               10 years

          (D)  negotiable debt obligations issued by the U.S.         X         X          95%
               Treasury Department having a remaining maturity
               at issuance of more than 10 years
</Table>

                                       11

<PAGE>
     Certificated securities shall not constitute "Eligible Collateral".

     (iii) OTHER ELIGIBLE SUPPORT. As set forth in the Confirmation.

     (iv)  THRESHOLDS.

           (A) "INDEPENDENT AMOUNT" means with respect to Party A:$0.
               "INDEPENDENT AMOUNT" means with respect to Party B:$0.

           (B) "THRESHOLD" means, with respect to this Credit Support Annex and
               with respect to Party A and Party B: $0.

           (C) "MINIMUM TRANSFER AMOUNT" means with respect to Party A and Party
               B U.S. $100,000; provided, however, that if a Secured Party is
               holding Posted Credit Support and the Credit Support Amount for
               that Secured Party is, or is deemed to be, zero at that time and,
               but for its Minimum Transfer Amount, the Secured Party would be
               required to make a Transfer to the Pledgor under Paragraph 3(b),
               the Minimum Transfer Amount will be zero; and, provided further,
               that if an Event of Default or a Potential Event of Default
               occurs and is continuing with respect to such party or an Early
               Termination Date has occurred or been designated as a result of
               an Event of Default with respect to such party, the Minimum
               Transfer Amount will be zero.

           (D) ROUNDING. The Delivery Amount and the Return Amount will be
               rounded up and down to the nearest integral multiple of $50,000,
               respectively, with $500 being rounded up.

(c) VALUATION AND TIMING.

     (i)   "VALUATION AGENT" means Citibank, N.A.

     (ii)  "VALUATION DATE" means each Local Business Day.

     (iii) "VALUATION TIME" means the close of business in the city of the
           Valuation Agent on the Local Business Day before the Valuation Date
           or date of calculation, as applicable; provided that the calculations
           of Value and Exposure will be made as of approximately the same time
           on the same date.

     (iv)  "NOTIFICATION TIME" means 1:00 p.m., New York time, on a Local
           Business Day.

                                       12
<PAGE>
(d)  CONDITIONS PRECEDENT AND SECURED PARTY'S RIGHTS AND REMEDIES. There shall
     be no "SPECIFIED CONDITIONS" for either party.

(e)  SUBSTITUTION.

     (i)    "SUBSTITUTION DATE" has the meaning specified in Paragraph 4(d)(ii).

     (ii)   CONSENT. If specified here as applicable, then the Pledgor must
            obtain the Secured Party's consent for any substitution pursuant to
            Paragraph 4(d): Inapplicable.

(f)  DISPUTE RESOLUTION.

     (i)    "RESOLUTION TIME" means 1:00 p.m., New York time, on the Local
            Business Day following the date on which the notice of a dispute is
            given under Paragraph 5.

     (ii)   VALUE. For the purpose of Paragraphs 5(i)(C) and 5(ii), the Value of
            Posted Credit Support will be calculated as follows: Disputes over
            Value will be resolved by the Valuation Agent seeking three bid
            quotes as of the relevant Valuation Date or date of Transfer from
            parties that regularly act as dealers in the securities or other
            property in question. The Value will be the arithmetic mean of the
            quotes received by the Valuation Agent multiplied by the applicable
            Valuation Percentage.

     (iii)  ALTERNATIVE. The provisions of Paragraph 5 will apply.

(g)  HOLDING AND USING POSTED COLLATERAL.

     (i)    ELIGIBILITY TO HOLD POSTED COLLATERAL; CUSTODIANS. Party A will be
            entitled to hold Posted Collateral pursuant to Paragraph 6(b);
            provided that the following conditions applicable to it are
            satisfied:

            (1)  Party A is not a Defaulting Party.

            (2)  Posted Collateral may be held only in the following
                 jurisdictions: United States.

            (3)  Party A's Custodian shall (A) be a U.S. financial institution
                 or the U.S. branch of a non-U.S. financial institution and (B)
                 have a rating of A1 or higher by Moody's Investors Services,
                 Inc. ("Moody's") and A+ or higher by Standard & Poor's
                 Corporation ("S&P"), respectively, and have a capitalization in
                 excess of $5 Billion. The Custodian shall be a party acceptable
                 to Party B.

                                       13

<PAGE>
                  (4) Party A has a Long Term Issuer Rating applicable to the
                      Head Office of Citibank, N.A. of at least Baa3 and BBB-,
                      as determined by Moody's or S&P, respectively.

         Initially, the CUSTODIAN for Party A is: None.

         Party B and its Custodian will be entitled to hold Posted Collateral
         pursuant to Paragraph 6(b); provided that the following conditions
         applicable to it are satisfied:

         (1)  Party B is not a Defaulting Party.

         (2)  Posted Collateral may be held only in the following jurisdictions:
              United States.

         (3)  Party B's Custodian shall (A) be a U.S. financial institution or
              the U.S. branch of a non-U.S. financial institution and and (B)
              have a rating of A1 or higher by Moody's Investors Services, Inc.
              ("Moody's") and A+ or higher by Standard & Poor's Corporation
              ("S&P"), respectively, and have a capitalization in excess of $5
              Billion. The Custodian shall be a party acceptable to Party A.

         (4)  Party B has a senior long-term unsecured debt rating of at least
              Baa3 and BBB-, as determined by Moody's or S&P, respectively.

         Initially, the CUSTODIAN for Party B is: None.

         (ii) USE OF POSTED COLLATERAL. The provisions of Paragraph 6(c)(i) will
              apply to Party A and Party B; provided that in the case of Party A
              it has a Long Term Issuer Rating applicable to the Head Office of
              Citibank, N.A. of at least Baa3 and BBB-, as determined by Moody's
              or S&P, and in the case of Party B, it has a senior long-term
              unsecured debt rating of at lease Baa3 and BBB-, as determined by
              Moody's or S&P.

(h) DISTRIBUTIONS AND INTEREST AMOUNT.

         (i)  INTEREST RATE. The "INTEREST RATE" will be the Federal Funds Rate.
              "FEDERAL FUNDS RATE" means, for any day, the rate set forth in
              H.15(519) for that day opposite the caption "Federal Funds
              (Effective)". If on any day such rate is not yet published in
              H.15(519), the rate for such day will be the rate set forth in
              Composite 3:30 p.m. Quotations for U.S. Government Securities for
              that day under the caption "Federal Funds/Effective Rate". If on
              any day the appropriate rate for such day is not yet published in
              either H.15(519) or Composite 3:30 P.M. Quotations for U.S.
              Government Securities, the rate for such day will be the
              arithmetic means of the rates for the last transaction in
              overnight U.S. Dollar Federal funds arranged by three leading
              brokers of U.S.

                                       14
<PAGE>
           Dollar Federal funds transactions in New York City selected by
           Citibank in good faith prior to 9:00 a.m., New York City time, on
           such day. "H.15(519)" means the weekly statistical release designated
           as such, or any successor publication, published by the Board of
           Governors of the Federal Reserve System. "COMPOSITE 3:30 P.M.
           QUOTATIONS FOR U.S. GOVERNMENT SECURITIES" means the daily
           statistical release designated as such, or any successor publication,
           published by the Federal Reserve Bank of New York.

     (ii)  TRANSFER OF INTEREST AMOUNT. The Transfer of the Interest Amount
           will be made on the last Local Business Day of each calendar month
           and on any Local Business Day that all Posted Collateral in the form
           of Cash is transferred to the pledgor pursuant to paragraph 3(b).

     (iii) ALTERNATIVE TO INTEREST AMOUNT. The provisions of Paragraph 6(d)(ii)
           will apply.

(i) ADDITIONAL REPRESENTATION(S). None.

(j) OTHER ELIGIBLE SUPPORT AND OTHER POSTED SUPPORT. None.

(k) DEMANDS AND NOTICES.

    All demands, specification and notices under this Annex will be made
    pursuant to the Notices Section of this Agreement, unless otherwise
    specified here:

    Party A:  Citibank, N.A.
              333 West 34th Street
              2nd Floor
              New York, New York 10001
              Attention: Margin Operations
              Telephone No.: 212-615-8205
              Telefax No.: 212-615-8295

    Party B:  As set forth in the Schedule.

(l) ADDRESSES FOR TRANSFERS.

    Party A:  As set forth in demands and notices from one party to the other
              party from time to time.

    Party B:  As set forth in demands and notices from one party to the other
              party from time to time.

                                       15
<PAGE>
(m) OTHER PROVISIONS.

         (i)   The definition of Posted Collateral shall also include any and
               all accounts in which the Cash which constitutes Posted
               Collateral is held.

         (ii)  Paragraph 6(a) is hereby amended by adding the following sentence
               to the end thereof:

               The Secured Party shall identify on its books and records the
               Posted Collateral (including for the sake of clarity, any cash
               proceeds of or distribution on such Posted Collateral) held by it
               from all other assets it may hold.

         (iii) The following new paragraph is added to the end of Paragraph
               8(a):

               To the extent notice is required under applicable law, the
               parties hereto agree that notice on the day of sale is reasonable
               notice for purposes of the Uniform Commercial Code 9-504(3) (as
               in effect in New York).

         (iv)  Events of Default. Paragraph 7(i) shall be amended and restated
               in its entirety as follows:

               (i) that party fails (or fails to cause its Custodian) to make,
               when due any Transfer of Eligible Collateral, Posted Collateral
               or the Interest Amount as applicable, required to be made by it
               and that failure continues for one Local Business Day after
               notice of that failure is given to that party.

         (v)   For purposes of this Credit Support Annex, Local Business Day
               shall have the meaning specified in Paragraph 12; provided,
               however, that if the New York Stock Exchange is not scheduled to
               be open to transact business on such day, such day shall not be a
               Local Business Day.

                                       16
<PAGE>
CITIBANK, N.A.                               AMERITRADE HOLDING
                                             CORPORATION

By: /s/ LINDA K. COOK                        By: /s/ WILLIAM J. GERBER
    --------------------------                   -------------------------------

Print Name: Linda K. Cook                    Print Name: William J. Gerber
            ------------------                           -----------------------

Title: Vice President                        Title: Managing Director of Finance
       -----------------------                      ----------------------------

Date:                                        Date: 08/29/02
      ------------------------                     -----------------------------

                                       17

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