Document:

<PAGE>

                                                                     Exhibit 4.7

                              CBOT HOLDINGS, INC.

             INCORPORATED UNDER  THE LAWS OF THE STATE OF DELAWARE

COMMON STOCK                                                      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 COMMON STOCK, $.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:
   LASALLE BANK NA
       Transfer Agent and Registrar     Corporate Seal Here
                                                             President and Chief
                                                               Executive Officer
By

        Authorized Signature                                 Secretary

<PAGE>

                              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 no 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
_________, 2002. THE TRANSFER OF OF THE SECURITIES REPRESENTED BY THIS
CERTIFICATE IS SUBJECT TO CERTAIN CONDITIONS SET FORTH IN ARTICLE IV(D) 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 4.10

                                   AGREEMENT

     This Agreement is made and entered into this 1st day of September 1992
("Effective Date"), by and between the BOARD OF TRADE OF THE CITY OF CHICAGO
("CBOT"), an Illinois corporation incorporated by special act of the Illinois
General Assembly and located at 141 West Jackson Boulevard, Chicago, Illinois,
and the CHICAGO BOARD OPTIONS EXCHANGE, INC. ("CBOE"), a Delaware non-stock
corporation located at 400 South LaSalle Street, Chicago, Illinois.

     WHEREAS, paragraph (b) of Article Fifth of CBOE's Certificate of
Incorporation ("Article Fifth(b)") provides as follows:

     (b) In recognition of the special contribution made to the organization and
     development of the Corporation by the members of the Board of Trade of the
     City of Chicago, a corporation organized and existing by Special
     Legislative Charter of the General Assembly of the State of Illinois, and
     for the further purpose of promoting the growth and liquidity of the
     Corporation, developing a broad financial base of dues-paying members, and
     assuring participation on a continuing basis of persons experienced in the
     trading and clearing of contracts for future purchase or delivery on a
     central marketplace, every present and future member of said Board of Trade
     who applies for membership in the Corporation and who otherwise qualifies
     shall, so long as he remains a member of said Board of Trade, be entitled
     to be a member of the Corporation notwithstanding any such limitation on
     the number of members and without the necessity of acquiring such
     membership for consideration or value from the Corporation, its members or
     elsewhere. Members of the Corporation admitted pursuant to this paragraph
     (b) shall, as a condition of membership in the Corporation, be subject to
     fees, dues, assessments and other like charges, and shall otherwise be
     vested with all rights and privileges and subject to all obligations of
     membership, as provided in the by-laws. No amendment may be made with
     respect to this paragraph (b) of Article Fifth without the prior approval
     of not less than 80% of (i) the members of the Corporation admitted
     pursuant to this paragraph (b) and (ii) the members of the Corporation
     admitted other than pursuant to this paragraph (b), each such category of
     members voting as a separate class; provided, however, that any amendment
     to this paragraph (b) which is required under a final order of any court or
     regulatory agency having jurisdiction in the matter may be made in
     accordance with the provisions of Article Twelfth covering amendments to
     this Certificate of Incorporation generally, without regard to the above
     provisions concerning such 80% vote by classes.
<PAGE>

                                      -2-

     WHEREAS, the parties, in their own capacity and on behalf of their
respective members, dispute the meaning of certain terms as used in Article
Fifth(b) and the nature and scope of the entitlement referred to therein of a
CBOT member to be a CBOE member (the "Exercise Right"); and

     WHEREAS, the parties, in their own capacity and on behalf of their
respective members, wish to resolve this dispute to their mutual benefit,
including to avoid the costs, delays, and uncertainties of legal proceedings;

NOW, THEREFORE, in consideration of the foregoing and the mutual promises and
agreements contained herein (but subject to paragraph 4(a) below), the parties,
in their own capacity and on behalf of their respective members, agree as
follows:

1.   DEFINITIONS.
     ------------

     For the purposes of this Agreement, the following definitions apply:

     (a)  "Eligible CBOT Full Member" means an individual who at the time is the
          holder of one of the One Thousand Four Hundred Two (1,402) existing
          CBOT full memberships ("CBOT Full Memberships") and who is in
          possession of all trading rights and privileges appurtenant to such
          CBOT Full Membership. In the event a CBOT Full Membership is
          registered for a partnership, corporation or other entity, only the
          individual who is the holder of such CBOT Full Membership and who is
          in possession of all trading rights and privileges appurtenant to such
          CBOT Full Membership shall be deemed to be an "Eligible CBOT Full
          Member."

     (b)  "Eligible CBOT Full Member Delegate" means the individual to whom a
          CBOT Full Membership is delegated (leased) and who is in possession of
          all trading rights and privileges appurtenant to such CBOT Full
          Membership.

     (c)  "Trading rights and privileges appurtenant to such CBOT Full
          Membership" means (1) the rights and privileges of a CBOT Full
          Membership which entitle a holder or delegate to trade as principal
          and broker for others in all contracts traded on the CBOT, whether by
          open outcry, by electronic means, or otherwise, during any segment of
          a trading day when trading is authorized; and (2) every trading right
          or privilege granted, assigned or issued by CBOT after the effective
          date of this Agreement to holders of CBOT Full Memberships, as a
          class, but excluding any right or privilege which is the subject of an
          option granted, assigned or issued by CBOT to a CBOT Full Member and
          which is not exercised by such CBOT Full Member.

<PAGE>

                                      -3-

     (d)  "Exerciser Member" means an Eligible CBOT Full Member or Eligible CBOT
          Full Member Delegate who has exercised the Exercise Right to become
          and has become a CBOE Regular Member pursuant to Article Fifth(b).

     (e)  "CBOE Regular Member" or "CBOE Regular Membership" shall mean any CBOE
          regular member or membership (including an Exerciser Member or
          membership) entitled to all trading rights and privileges appurtenant
          to a CBOE membership in accordance with Section 2.1(b) of the CBOE
          Constitution. There are Nine Hundred Thirty-One (931) CBOE Regular
          Members, excluding Exerciser Members.

2.   THE CBOT'S AGREEMENTS.
     ----------------------

     (a)  The CBOT agrees, in its own capacity and on behalf of its members,
          that only an individual who is an Eligible CBOT Full Member or an
          Eligible CBOT Full Member Delegate is a member of the CBOT within the
          meaning of Article Fifth(b) eligible to have an Exercise Right and to
          be an Exerciser Member.

     (b)  The CBOT agrees, in its own capacity and on behalf of its members,
          that in the event the CBOT splits or otherwise divides CBOT Full
          Memberships into two or more parts, all such parts, and the trading
          rights and privileges appurtenant thereto, shall be deemed to be part
          of the trading rights and privileges appurtenant to such CBOT Full
          Memberships and must be in the possession of an individual as either
          an Eligible CBOT Full Member or an Eligible CBOT Full Member Delegate
          in order for that individual to be eligible to be an Exerciser Member.

     (c)  The CBOT agrees, in its own capacity and on behalf of its members,
          that, for the purpose of this Agreement and any rule, regulation or
          by-law adopted pursuant to or to implement this Agreement, and for
          the purpose of interpreting the meaning of Article Fifth(b), only the
          One Thousand Four Hundred Two (1,402) existing CBOT Full Memberships
          shall be deemed to be CBOT Full Memberships entitled to Exercise
          Rights under Article Fifth(b) and that any additional membership or
          memberships created by the CBOT, whether categorized by the CBOT as a
          full membership or as having the same trading rights and privileges as
          a CBOT Full Membership, shall be specifically excluded from
          entitlement to Article Fifth(b) Exercise Rights.

<PAGE>

                                      -4-

     (d)  Subject to Paragraph 4(a) below, the CBOT agrees to amend its rules
          and regulations in the form and manner set forth in Exhibit A hereto
          (the "CBOT Rule Change").

     (e)  The CBOT agrees that it will maintain an effective record of (i) every
          trading right and privilege which may hereafter be granted, assigned
          or issued in respect of each CBOT Full Membership and (ii) every
          delegation or lease of any CBOT Full Membership (or of any trading
          right or privilege appurtenant thereto). The CBOT agrees to make such
          records available to the CBOE promptly upon reasonable request
          therefor by the CBOE.

3.   THE CBOE'S AGREEMENTS.
     ----------------------

     (a)  The CBOE acknowledges and agrees, in its own capacity and on behalf of
          its members, that all Exerciser Members, including Exerciser Members
          who are Eligible CBOT Full Member Delegates, have the same rights and
          privileges of CBOE regular membership as other CBOE Regular Members,
          including the rights and privileges with respect to the trading of all
          CBOE products, except that Exerciser Members shall not have the right
          to transfer (whether by sale, lease, gift, bequest or otherwise)
          their CBOE regular memberships or any of the trading rights and
          privileges appurtenant thereto. Notwithstanding the foregoing, all
          Exerciser Members shall have the right to purchase or to participate
          in the offer or distribution of any optional or additional CBOE
          membership or any transferable or nontransferable trading right or
          privilege offered or distributed by the CBOE after the effective date
          of this Agreement to other CBOE Regular Members, as a class, on the
          same terms and conditions as other CBOE Regular Members, and any such
          additional membership, trading right or privilege so acquired by an
          Exerciser Member shall be separately transferable by such Exerciser
          Member on the same basis as the same may be separately transferable by
          other CBOE Regular Members. In the event the CBOE makes a cash or
          property distribution, whether in dissolution, redemption or
          otherwise, to other CBOE Regular Members as a class, which has the
          effect of diluting the value of a CBOE Membership, including that of a
          CBOE membership under Article Fifth(b), such distribution shall be
          made on the same terms and conditions to Exerciser Members.

     (b)  The CBOE agrees to establish a reasonable record date for any offer,
          distribution or redemption subject to Paragraph 3(a) above in order to
          give Eligible CBOT Full Members and Eligible CBOT Full Member
          Delegates a reasonable opportunity to become Exerciser Members and to
          participate in such offer, distribution or redemption. The CBOE
<PAGE>

                                      -5-

          agrees to notify the CBOT no less than ninety (90) days prior to every
          offer, distribution or redemption subject to Paragraph 3(a) above and
          of the record date established therefor unless impracticable in the
          circumstances, in which event the CBOE agrees to notify the CBOT no
          less than (30) days prior to every offer, distribution or redemption
          subject to Paragraph 3(a) above. In order to permit Eligible CBOT Full
          Members and Eligible CBOT Full Member Delegates to participate in an
          offer, distribution or redemption of the kind referred to in the last
          two sentences of Paragraph 3(a) above, and solely for such purpose,
          CBOE further agrees to waive all membership dues, fees and other
          charges and all qualification requirements, other than those that may
          be imposed by law, that may be applicable to the application for
          membership on CBOE of each Eligible CBOT Full Member and Eligible CBOT
          Full Member Delegate who wishes to exercise the Exercise Right during
          the period commencing on the date CBOE gives notice to CBOT pursuant
          to this Paragraph 3(b) and ending on the date such individual
          participates in such offer, distribution or redemption (as the case
          may be); provided, however, that (i) no Exerciser Member for whom
          dues, fees and other charges and qualification requirements are waived
          in accordance with the foregoing shall have any rights as a CBOE
          member other than to participate in such offer, distribution or
          redemption, and (ii) the CBOE membership of each such Exerciser Member
          shall terminate immediately following the time such individual
          participates in such offer, distribution or redemption.

     (c)  The CBOE agrees, in its own capacity and on behalf of its members,
          that any Eligible CBOT Full Member or Eligible CBOT Full Member
          Delegate is entitled to become an Exerciser member pursuant to Article
          Fifth(b), provided such individual qualifies to be a CBOE Regular
          Member in accordance with the rules of the CBOE applicable generally
          to CBOE Regular Membership.

     (d)  The CBOE agrees, in its own capacity and on behalf of its members,
          that in the event the CBOT merges or consolidates with or is acquired
          by or acquires another entity ("entity") and (i) the survivor of such
          merger, consolidation or acquisition ("survivor" is an exchange which
          provides or maintains a market in commodity futures contracts or
          options, securities, or other financial instruments, and (ii) the
          1,402 holders of CBOT Full Memberships are granted in such merger,
          consolidation or acquisition membership in the survivor ("Survivor
          Membership"), and (iii) such Survivor Membership entitles the holder
          thereof to have full trading rights and privileges in all products
          then or thereafter traded on the survivor (except that such trading
          rights and privileges need not include products that, at the time of
          such merger, consolidation or acquisition, are traded or listed,

<PAGE>

                                      -6-

          designated or otherwise authorized for trading on the other entity but
          not on the CBOT), then the Exercise Right of Article Fifth(b) shall
          continue to apply and this Agreement shall continue in force and
          effect (with the words "CBOT Full Membership" being interpreted to
          mean "Survivor Membership"). Article Fifth(b) shall not apply to any
          other merger or consolidation of CBOT with, or acquisition of CBOT by,
          another entity.

     (e)  The CBOE agrees that a significant purpose of the Agreement is to
          ensure that CBOE will not make any offer, distribution or redemption
          to CBOE Regular Members as a class which would have the effect of
          diluting the rights under Article Fifth(b) of Eligible CBOT Full
          Members and Eligible CBOT Full Member Delegates. It is the intention
          of the parties that Paragraphs 3(a) and 3(b) above are the agreed and
          sole means of ensuring that Eligible CBOT Full Members and Eligible
          CBOT Full Member Delegates will have the ability to participate in
          every offer, distribution or redemption which would have the effect of
          diluting the value of CBOE regular memberships, including CBOE
          memberships under Article Fifth(b).

     (f)  Subject to Paragraph 4(a) below, the CBOE agrees to amend its Rule
          3.16(c) in the form and manner set forth in Exhibit B hereto (the
          "CBOE Rule Change"), including rescinding and withdrawing its
          currently proposed Rule 3.16(c) from consideration by the Securities
          and Exchange Commission.

4.  SPECIAL PROVISIONS.
    -------------------

     (a)  CBOT represents that the CBOT Rule Change requires the approval of
          both the CBOT membership and the Commodity Futures Trading Commission
          in order to become effective. CBOE represents that this Agreement and
          the CBOE Rule Change require the approval of both the CBOE membership
          and the Securities and Exchange Commission in order to become
          effective. The parties agree to work in good faith to obtain all such
          approvals as expeditiously as possible. Should any required approval
          not be obtained, however, then this Agreement shall be null and void,
          as if never executed, and neither party shall be deemed to be in any
          way bound by any term or provision, including any agreement or
          acknowledgment, of this Agreement.

     (b)  From and after the Effective Date and so long as this Agreement
          remains in force and effect, the CBOT Rule Change shall not be amended
          or modified in any way by the CBOT without the written consent of the
          CBOE, and the CBOE Rule Change shall not be amended or modified in

<PAGE>

                                      -7-

          any way by the CBOE without the written consent of the CBOT, which
          consent in either case shall not be unreasonably withheld.

     (c)  The CBOT agrees to enforce the CBOT Rule Change after the same has
          been approved and has become effective as set forth in Paragraph 4(a)
          hereof, and the CBOE agrees to enforce the CBOE Rule Change after the
          same has been approved and has become effective as set forth in
          Paragraph 4(a) hereof. In the event that the validity of any provision
          of this Agreement or any rule, regulation or bylaw adopted pursuant to
          this Agreement shall be challenged by any person, the parties mutually
          agree that they will jointly defend the validity of such challenged
          provision or rule, regulation or bylaw.

     (d)  The parties mutually agree that it is appropriate, and within the
          meaning and spirit of Article Fifth(b), for the CBOE to interpret
          Article Fifth(b) in accordance with the provisions of this Agreement.

5.   TERMINATION.
     -----------

     This Agreement shall become effective on the Effective Date, subject to
Paragraph 4(a) above, and shall remain in full force and effect thereafter
unless and until terminated in accordance with this Paragraph. Either party may
terminate this Agreement for cause, and only for cause, by giving the other
party fifteen (15) days written notice of the termination and the cause
therefore; provided, however, that if the other party remedies the cause for
termination to the reasonable satisfaction of the notifying party during such
fifteen (15) day period, this Agreement shall not be terminated and shall remain
in full force and effect. Cause shall include only (i) a material breach of this
Agreement; or (ii) in the event this Agreement, or any part of it, or any rule,
regulation or bylaw adopted pursuant to and to implement this Agreement, is set
aside by order of a court or regulatory agency of competent jurisdiction.

6.   MISCELLANEOUS.
     -------------

     (a)  This Agreement constitutes the entire understanding of the parties. No
          waiver, alteration or modification of any of the provisions hereof
          shall be binding unless in writing and signed by a duly authorized
          representative of each party.

     (b)  Except to the extent that this Agreement or any rule adopted pursuant
          to this Agreement is governed by any law of the United States or of a
          rule or regulation adopted by a regulatory agency pursuant to any such

<PAGE>

                                      -8-

          law, this Agreement shall be governed by and construed in accordance
          with the laws of the State of Illinois.

     (c)  The parties mutually agree that either party to this Agreement may
          bring suit (on its own behalf or on behalf of its members, or both) to
          enforce the terms of this Agreement and to recover damages for any
          breach of this Agreement.

CHICAGO BOARD OPTIONS EXCHANGE, INC.

BY:  /s/ Alger B. Chapman
     ------------------------------------------

TITLE:  Chairman of the Board
     ------------------------------------------

BY:  /s/ William C. Floersch
     ------------------------------------------

TITLE:  Vice Chairman of the Board
     ------------------------------------------

BOARD OF TRADE OF THE CITY OF CHICAGO

BY:  /s/ Thomas R. Donovan
     ------------------------------------------

TITLE:  President and Chief Executive Officer
     ------------------------------------------

BY:  /s/ William F. O'Connor
     ------------------------------------------

TITLE:  Chairman of the Board
     ------------------------------------------

<PAGE>

                                      -9-

                                   EXHIBIT A
                                   ---------

                    CHICAGO BOARD OF TRADE-RULE AMENDMENTS
                    --------------------------------------

210.00 Full Member CBOE "Exercise" Privilege. In accordance with the Agreement
entered into on           , 1992 (the "Agreement") between the Exchange and the
Chicago Board Options Exchange ("CBOE"), Eligible CBOT Full Members who maintain
all appurtenant trading rights and privileges of a full membership, including
any new trading rights or privileges granted, assigned or issued to a CBOT full
membership to the extent such right or privilege is deemed under the provisions
of such Agreement to be appurtenant to a CBOT Full Membership, are eligible to
become regular members of the CBOE pursuant to Article Fifth(b) of CBOE's
Certificate of Incorporation. A CBOT Full Member may delegate all of his trading
rights and privileges of full membership to an individual who will then be
eligible to become a regular CBOE member pursuant to Article Fifth(b) of CBOE's
Certificate of Incorporation; provided, however, if a CBOT Full Member delegates
some, but not all, of the appurtenant trading rights and privileges of full
membership, then neither the member nor the delegate will be eligible to be a
CBOE regular member pursuant to Article Fifth(b). No person who is not either an
Eligible CBOT Full Member or an Eligible CBOT Full Member Delegate (See Rule
221.00(g)(ii)) shall knowingly apply to become, or knowingly remain, a regular
member of CBOE pursuant to Article Fifth(b) of CBOE's Certificate of
Incorporation.

     For purposes of the Agreement entered into on          , 1992 between the
Exchange and the CBOE, an Eligible CBOT Full Member means an individual who at
the time is the holder of one of the One Thousand Four Hundred Two (1,402) CBOT
full memberships ("CBOT Full Memberships") existing on the date of the Agreement
and who is in possession of all trading rights and privileges appurtenant to
such CBOT Full Membership. In the event a CBOT Full Membership is registered for
a partnership, corporation or other entity, only the individual who is the
holder of such CBOT Full Membership and who is in possession of all trading
rights and privileges appurtenant to such CBOT Full Membership shall be deemed
to be an "Eligible CBOT Full Member." "Trading rights and privileges appurtenant
to such CBOT Full Membership" means (1) the rights and privileges of a CBOT Full
Membership which entitle a holder or delegate to trade as principal and broker
for others in all contracts traded on the CBOT, whether by open outcry, by
electronic means, or otherwise, during any segment of a trading day when trading
is authorized; and (2) every trading right or privilege granted, assigned or
issued by CBOT after the effective date of this Agreement to holders of CBOT
Full Memberships, as a class, but excluding any right or privilege which is the
subject of granted, assigned or issued by CBOT to a CBOT Full Member and which
is an option not exercised by such CBOT Full Member.

<PAGE>

                                     -10-

221.00 Delegation - An individual member may delegate the rights and privileges
of Full and/or Associate Memberships to an individual (a "delegate") upon the
following terms and conditions:

                                 *  *  *  *  *

(g)(i) In accordance with the Agreement entered into on        , 1992 ("the
Agreement") between the Exchange and the Chicago Board Options Exchange
("CBOE"), only an individual who is an "Eligible CBOT Full Member" or an
"Eligible CBOT Full Member Delegate", as those terms are defined in the
Agreement, is a "member" of the Exchange within the meaning of paragraph (b) of
Article Fifth of CBOE's Certificate of Incorporation ("Article Fifth(b)") and
only such individuals are eligible to become and to remain regular members of
the CBOE pursuant to Article Fifth(b). No person who is not either an Eligible
CBOT Full Member or an Eligible CBOT Full Member Delegate shall knowingly apply
to become, or knowingly remain, a regular member of CBOE pursuant to Article
Fifth(b) of CBOE's Certificate of Incorporation.

(g)(ii) For purposes of the "Agreement" referenced in Rule 221.00(g)(i), an
"Eligible CBOT Full Member Delegate" means the individual to whom a CBOT Full
Membership is delegated (leased) and who is in possession of all trading rights
and privileges appurtenant to such CBOT Full Membership. "Trading rights and
privileges appurtenant to such CBOT Full Membership" means (1) the rights and
privileges of a CBOT Full Membership which entitle a holder or delegate to trade
as principal and broker for others in all contracts traded on the CBOT, whether
by open outcry, by electronic means, or otherwise, during any segment of a
trading day when trading is authorized; and (2) every trading right or privilege
granted, assigned or issued by CBOT after the effective date of this Agreement
to holders of CBOT Full Memberships, as a class, but excluding any right or
privilege which is the subject of an option granted, assigned or issued by CBOT
to a CBOT Full Member and which is not exercised by such CBOT Full Member.

<PAGE>

                                     -11-

                                   EXHIBIT B
                                   ---------

              CHICAGO BOARD OPTIONS EXCHANGE, INC.-RULE AMENDMENT
              ---------------------------------------------------

     Rule 3.16(c) of the Chicago Board Options Exchange, Inc. shall be amended
to be and read as follows:

Deletions [bracketed].

[Rule 3.16(c) Board of Trade Exercisers. For the purpose of continued
entitlement to membership on the Exchange in accordance with Section 2.1(b) of
the Constitution and Paragraph (b) of Article Fifth of the Certificate of
Incorporation of the Exchange, the term "member of the Board of Trade of the
City of Chicago" (the "Board") is interpreted to mean a single individual or
organization in possession of a full Board membership as described below. Such
membership shall consist of all the trading rights and privileges afforded to
Board memberships as in existence on February 4, 1972 (the date the Exchange's
Certificate of Incorporation was adopted) except for such rights and privileges
which the Exchange may exclude. Where the member is an organization, one
individual must possess all of a full membership's trading rights and privileges
on the Board. If any part not excluded by the Exchange (but less than all) of a
full membership's trading rights and privileges on the Board is sold, leased,
licensed, delegated or in any other fashion transferred, then neither the
transferor or the transferee of such rights and privileges shall be deemed to be
a "member of the Board" entitled to Exchange membership. If a full membership's
trading rights and privileges, as they existed on February 4, 1972, should be
split into two or more sets of rights or privileges or be segmented or separated
in any other manner, then, in order for an individual or organization to be
deemed to be in possession of all the pertinent and regular trading rights and
privileges afforded such full membership, such individual or organization must
be in possession of, and have pertinent and regular trading rights and
privileges with respect to all of the split, segmented or separated parts of
such original membership except for those excluded by the Exchange.]

     Rule 3.16(c). Board of Trade Exercisers. For the purpose of entitlement to
membership on the Exchange in accordance with Paragraph (b) of Article Fifth of
the Certificate of Incorporation of the Exchange ("Article Fifth(b)") the term
"member of the Board of Trade of the City of Chicago" (the "CBOT"), as used in
Article Fifth(b), is interpreted to mean an individual who is either an
"Eligible CBOT Full Member" or an "Eligible CBOT Full Member Delegate," as those
terms are defined in the Agreement entered into on           , 1992, (the
"Agreement") between the CBOT and the Exchange, and shall not mean any other
person. In order to permit Eligible CBOT Full Members and Eligible CBOT Full
Member Delegates to participate in an offer, distribution or redemption of the
kind referred to in the last two sentences of Paragraph 3(a) of the Agreement,
and solely for such purpose, CBOE agrees to waive all membership dues, fees and

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                                     -12-

other charges and all qualification requirements, other than those that may be
imposed by law, that may be applicable to the application for membership on CBOE
of each Eligible CBOT Full Member and Eligible CBOT Full Member Delegate who
wishes to exercise the Exercise Right during the period commencing on the date
CBOE gives notice to CBOT pursuant to Paragraph 3(b) of the Agreement and ending
on the date such individual participates in such offer, distribution or
redemption (as the case may be); provided, however, that (i) no Exerciser Member
(as defined in the Agreement) for whom dues, fees and other charges and
qualification requirements are waived in accordance with the foregoing shall
have any rights as a CBOE member other than to participate in such offer,
distribution or redemption, and (ii) the CBOE membership of each such Exerciser
Member shall terminate immediately following the time such individual
participates in such offer, distribution or redemption.

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