Document:

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                                                                     Exhibit 4.3

                              CBOT HOLDINGS, INC.

             INCORPORATED UNDER  THE LAWS OF THE STATE OF DELAWARE

CLASS A COMMON STOCK [, SERIES A-__]                              CUSIP:  14984K

The transfer of shares of stock represented by this certificate is subject to
the restrictions set forth on the reverse side.

THIS CERTIFIES THAT

is the record holder of

      FULLY PAID AND NON-ASSESSABLE SHARES OF CLASS A COMMON STOCK, [SERIES
A-__,] $.001 PAR VALUE PER SHARE, OF

                              CBOT HOLDINGS, INC.

transferable only on the books of the Corporation by the holder hereof in person
or by duly authorized Attorney upon surrender of the Certificate properly
endorsed. [This Certificate is not valid until countersigned by the Transfer
Agent and registered by the Registrar.]

In Witness whereof the Corporation has caused this Certificate to be executed
and attested to by the manual or facsimile signatures of its duly authorized
officers, under a facsimile of its corporate seal to be affixed hereto.

Dated:

COUNTERSIGNED AND REGISTERED:

       Transfer Agent and Registrar     Corporate Seal Here
                                                             President and Chief
                                                               Executive Officer
By

        Authorized Signature                                 Secretary

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                              CBOT HOLDINGS, INC.

  Upon request the Corporation will furnish any holder of shares of Common Stock
of the Corporation, without charge, with a full statement of the powers,
designations, preferences and relative, participating, optional or other special
rights of any class or series of capital stock of the Corporation, and the
qualifications, limitations or restrictions of such preferences and/or rights.

  The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM - as tenants in common            UNIF GIFT MIN ACT -    Custodian
TEN ENT - as tenants by the entireties
JT TEN  - as joint tenants with right of                     under Uniform Gifts
          survivorship and not as tenants                    to Minors Act
          in common                                               (State)

                                           UNIF TRF MIN ACT - Custodian (until
                                                              age  )

                                                              under Uniform
                                                              Transfers
                                                              to Minors Act

                                                                  (State)

     Additional abbreviations may also be used though not in the above list

For Value received,                     hereby sells, assigns and transfers unto
                   ------------------

PLEASE INSERT SOCIAL SECURITY OR OTHER
  IDENTIFYING NUMBER OF ASSIGNEE

  ------------------------------

--------------------------------------------------------------------------------
    PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE,
                                  OF ASSIGNEE

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
                                                                    Shares
--------------------------------------------------------------------

of the Common Stock represented by the within Certificate, and do(es) hereby
irrevocably constitute and appoint

                                                                    Attorney
--------------------------------------------------------------------

to transfer the said stock on the books of the within named Corporation with
full power of substitution in the premises.

Dated
     -------------------------
                                                X
                                                 -------------------------------

                                                X
                                                 -------------------------------
                                         NOTICE: The Signature(s) to this
                                                 assignment must correspond with
                                                 the name(s) as written upon the
                                                 face of the certificate in
                                                 every particular without
                                                 alteration or enlargement or
                                                 any change whatever.

Signature(s) Guaranteed:

By
---------------------------------------------------------------
THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE
GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15

     THE SECURITIES REPRESENTED BY THIS CERTIFICATE WERE ORIGINALLY ISSUED ON
_________, _____. THE TRANSFER OF THE SECURITIES REPRESENTED BY THIS CERTIFICATE
IS SUBJECT TO CERTAIN CONDITIONS SET FORTH IN ARTICLE IV(C) OF THE AMENDED AND
RESTATED CERTIFICATE OF INCORPORATION (AS AMENDED, RESTATED, MODIFIED OR
REPEALED IN ACCORDANCE WITH ITS TERMS) OF CBOT HOLDINGS, INC.(THE "COMPANY"). A
COPY OF SUCH CONDITIONS SHALL BE FURNISHED BY THE COMPANY TO THE HOLDER HEREOF
UPON WRITTEN REQUEST AND WITHOUT CHARGE. THIS LEGEND WILL BE REMOVED UPON THE
REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE.<PAGE>
                                                                  Exhibit 10.13
Confidential

                       IN THE UNITED STATES DISTRICT COURT
                       FOR THE NORTHERN DISTRICT OF TEXAS
                                 DALLAS DIVISION

eSPEED, INC., and ELECTRONIC TRADING  )
SYSTEMS CORPORATION,                  )
                                      )
                    Plaintiff(s)      )
                                      )
                                      )       CIVIL ACTION NO. 3:99-CV- 1016-M
                                      )
                                      )
VS.                                   )
                                      )
THE BOARD OF TRADE OF THE CITY OF     )
CHICAGO and THE CHICAGO MERCANTILE    )
EXCHANGE,                             )
                                      )
                    Defendant(s)      )

                              SETTLEMENT AGREEMENT
                              --------------------

1.   The parties hereto agree that this lawsuit and all related claims, lawsuits
     and controversies between them, asserted or assertable in connection with
     or arising out of this case, are hereby settled in accordance with the
     following terms of this Settlement Agreement. The parties agree that the
     terms of this Settlement Agreement are for the purpose of disposing of
     disputed claims, and are not an admission of liability on the part of any
     party hereto.

2.   The consideration to be given for this settlement is as follows:

     See Attachment "A" and "B" which are attached hereto and made *a part
     hereof.

3.   The above styled and numbered case shall be resolved by an agreed order of
     dismissal with prejudice with costs taxed to the party incurring same.

4.   Conditioned upon the initial payments due pursuant to Attachments A and B,
     the parties agree to release, discharge, and forever hold each other
     harmless from any and all claims, demands, suits, and judgments, known or
     unknown, fixed or contingent, liquidated or unliquidated, which were
     asserted or assertable in the above case, as of this date, arising from or
     related to any act or omission or event occurring up to the date of this
     Agreement. These releases run to the benefit of all attorneys, agents,
     employees, trustees, officers, directors, shareholders, partners, heirs,
     assigns, and legal representatives of the parties, in each case only as to
     acts made solely in such capacity, as well as the parties' majority-owned
     direct or indirect subsidaries and One Chicago. For clarity, the release
     with respect to past acts of infringement shall extend to (1) the Board of
     Trade Clearing Corporation, (2) any suppliers (only to the extent they
     acted in the capacity of a supplier) of all or a portion of CME's
     Electronic Futures Exchange (as defined in Attachment A) solely with
     respect to the acts of making for CME, selling to CME, and offering for
     sale to CME, all or a portion of CME's Electronic Futures Exchange and (3)
     any suppliers of all or a portion of CBOT's Electronic Futures Exchange (as
     defined in Attachment B) solely with respect to the acts of making for
     CBOT, selling to CBOT, and offering for sale to CBOT, all or a portion of
     CBOT's Electronic Futures Exchange.

<PAGE>

     "Party," if used in these releases, includes all named parties to this
     Agreement, and all related entities of the parties, including, without
     limitation, Chicago Mercantile Exchange Holdings Inc. and Chicago
     Mercantile Exchange Inc.

5.   Each signatory hereto warrants and represents that:

     (a)  He or she has authority to bind the party or parties for whom such
          person acts except as set forth in paragraph 10(b).

     (b)  It has the authority to dispose of and/or grant rights with respect to
          the claims, suits, rights and/or interests which are the subject
          matter hereto and that such claims, suits, rights and/or interests
          have not been assigned, transferred or sold.

(6)  (a)  eSpeed represents and warrants to CBOT and CME that as of the
          Effective Date, eSpeed is not aware of any claims against CBOT, CME,
          or their respective majority-owned direct or indirect subsidiaries,
          other than the claims that are released and discharged by this
          Agreement.

     (b)  ETS represents and warrants to CBOT and CME that as of the Effective
          Date, ETS is not aware of any claims against CBOT, CME, or their
          majority-owned direct or indirect subsidiaries, other than the claims
          that are released and discharged by this Agreement.

     (c)  CBOT represents and warrants to eSpeed that as of the Effective Date,
          CBOT is not aware of any claims against eSpeed or its majority-owned
          direct or indirect subsidiaries, other than the claims that are
          released and discharged by this Agreement.

     (d)  CBOT represents and warrants to ETS that as of the Effective Date,
          CBOT is not aware of any claims against ETS or its majority-owned
          direct or indirect subsidiaries, other than the claims that are
          released and discharged by this Agreement.

     (e)  CME represents and warrants to eSpeed that as of the Effective Date,
          CME is not aware of any claims against eSpeed or its majority-owned
          direct or indirect subsidiaries, other than the claims that are
          released and discharged by this Agreement.

     (f)  CME represents and warrants to ETS that as of the Effective Date, CME
          is not aware of any claims against ETS or its majority-owned direct or
          indirect subsidiaries, other than the claims that are released and
          discharged by this Agreement.

<PAGE>

7.   The parties are authorized to make disclosure of the terms of this
     Agreement to their respective attorneys, accountants, tax advisors and
     other persons or entities having a valid commercial interest in the subject
     matter hereof, provided that prior to any such disclosure, the person or
     entity to whom such disclosure is made shall agree to keep this Agreement
     confidential. If any party is sought to be required by judicial or
     legislative subpoena, notice or other process or demand to furnish
     information covering the terms of this Agreement, such party shall give as
     much advance written notice thereof as is reasonably possible to the other
     parties so that they may, if they so elect, seek protective relief.
     Notwithstanding the foregoing, eSpeed shall be allowed to disclose the
     financial terms of this Agreement to licensees for purposes of matters
     related to most favored licensee provisions.

8.   The parties shall make no suggestion that CBOT or CME, by entering into
     this Agreement, has admitted infringement or validity, nor shall the
     parties make any suggestion that eSpeed and/or ETS has conceded
     noninfringement or invalidity. Also, the parties agree to refer to this
     document as a settlement agreement.

9.   If one or more disputes arise with regard to the interpretation and/or
     performance of this Agreement or any of its provisions, the parties agree
     to attempt to resolve same by telephone conference with Bud Silverberg, the
     Mediator who facilitated this settlement. If the parties cannot resolve
     their differences by telephone conference, then each agrees to schedule one
     day of mediation with such Mediator within thirty (30) days to resolve the
     dispute and to share the costs of same equally. If a party refuses to
     mediate, then that party may not recover attorney's fees and costs in any
     litigation brought to construe or enforce this Agreement. Otherwise, if
     mediation is unsuccessful and litigation is brought to construe or enforce
     this Agreement, then the prevailing party or parties shall be entitled to
     recover reasonable attorney's fees, court costs and expenses, including the
     cost of the mediation.

10.  Other terms of this settlement are as follows:

     (a)  Attorney's Fees: Each party shall pay its own attorney's fees.

     (b)  This Agreement is subject to the approval of the Board of Directors of
          CBOT by the close of business on August 27,2002.

11.  This Settlement Agreement is made and performable in Dallas County, Texas,
     and shall be construed in accordance with the laws of the State of Texas.

12.  Each signatory to this Settlement Agreement has entered into same freely
     and without duress after having consulted with counsel of his or her
     choice. Each party hereto has been advised by the Mediator that the
     Mediator is not the attorney for any party and that

<PAGE>

     each party should have this Agreement reviewed by that party's counsel
     prior to executing same. All signatories to this Agreement hereby release
     the Mediator from any and all responsibility arising from the drafting
     of this Settlement Agreement.

13.  All parties agree that faxed signatures shall be sufficient to bind the
     parties hereto.

14.  If either CBOT does not execute this Agreement or the Board of Directors of
     the CBOT fails to approve this Agreement, then this Agreement shall be
     binding as between eSpeed, ETS, and CME, provided that those provisions
     applicable to CBOT shall be null and void.

Signed this 23rd day of August 2002.

PLAINTIFF(S):                               DEFENDANT(S):

  /s/ Howard Lutnick                          /s/ Nickolas J. Neubauer
----------------------------------          ----------------------------------
      Chairman, eSpeed, Inc.                      CBOT Chairman
----------------------------------          ----------------------------------

----------------------------------          ----------------------------------
  /s/ H. C. Sibley                            /s/ Terrence A. Duffy
----------------------------------          ----------------------------------
      Chairman, Electronic Trading                Chairman, CME
----------------------------------          ----------------------------------
      Systems Corp.
----------------------------------          ----------------------------------

APPROVED AS TO FORM:                        APPROVED AS TO FORM:

----------------------------------          ----------------------------------

----------------------------------          ----------------------------------

----------------------------------          ----------------------------------

----------------------------------          ----------------------------------
COUNSEL FOR PLAINTIFF(S)                    COUNSEL FOR DEFENDANT(S)

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                                  ATTACHMENT B
                                  ------------

"CBOT's Electronic Futures Exchange" shall mean an electronic exchange operated
by or for the benefit of CBOT, its majority-owned (directly or indirectly)
subsidiaries (the "Subsidiaries"), its successors, and its associated clearing
organizations, in each case for the trading and clearing of CBOT's products, (1)
where users of the electronic exchange (and/or their agents) can enter bids and
offers which are matched by a computer, and (2) which CBOT makes available to
its members and/or customers, CBOT controls primary access thereto, and CBOT
must provide consent for a third party to gain access thereto. This definition
includes One Chicago with respect to futures contracts on individual securities
and narrow based security indices. Except with respect to CBOT, its successors,
Subsidiaries, and associated clearing organizations, this definition does not
include electronic futures exchanges in which CBOT may have an ownership
interest, a controlling interest (whether by exercise of voting rights or
through an exercise of other interests) and/or operational responsibility.

"Licensed Activities" shall mean an activity by which CBOT's Electronic Futures
Exchange is used to match bids and offers, together with associated clearing and
compliance functions, in each case as defined in the `201 Patent. eSpeed and ETS
agree that no license is required for the trading of commodities.

Conditioned upon the payment called for below, eSpeed grants to CBOT a
worldwide, non-exclusive, non-transferable, paid-up license, (but without the
right to sublicense), to make, have made, and use (but not to sell or offer for
sale) an electronic marketplace for conducting Licensed Activities under United
States Patent 4,903,201 (the `201 Patent) for the life thereof. For the
avoidance of doubt, CBOT shall have the right to transfer this Agreement and
license to the successor entitites previously described in CBOT's pending S-4
Registration Statement, provided such parties agree to be bound by all terms
hereof and provided that all warranties and representations made herein can be
made by such entities.

The license granted herein does not give CBOT the right to license, sell, or
offer for sale any software that matches bids and offers for an electronic
trading system to any third party, provided that CBOT may do so where proper
pursuant to the terms of a license granted to a third party by eSpeed. For
convenience of the parties and without resolving any legal issues concerning the
following, the parties agree that none of the following shall constitute a sale
or offer for sale of any invention claimed in the Patent: selling stock or
memberships in the CBOT, leasing or selling equipment to be used with any CBOT's
Electronic Futures Exchange, or receiving monetary compensation for the use of
CBOT's Electronic Futures Exchange.

Notwithstanding anything to the contrary, the license granted herein shall not
allow CBOT to process trades for any third party futures exchange, provided
that CBOT may do so where proper pursuant to the terms of a license granted to a
third party by eSpeed.

Nothing herein shall be construed to grant any license to (or constitute a
waiver of exhaustion of rights with respect to) any intellectual property other
than United States Patent no. 4,903,201, either explicitly or by implication.

For the rights and license granted herein, CBOT shall make a lump sum settlement
payment (which includes a paid up license fee) to eSpeed of fifteen million
dollars ($15,000,000). For the convenience of the parties, and as requested by
CBOT, the lump sum settlement payment shall be payable to eSpeed in installments
as set forth below:

                                       1

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     (i)  Within thirty (30) business days following the Effective Date, CBOT
          shall wire transfer to a bank account specified by eSpeed a first
          installment in the amount of five million dollars ($5,000,000); and

     (ii) On each of the first, second, third, fourth, and fifth anniversaries
          of the Effective Date, CBOT shall wire transfer to a bank account
          specified by eSpeed a yearly installment in the amount of two million
          dollars ($2,000,000), the last such installment to be made on the
          anniversary of the Effective Date in the year 2007.

                                       2

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