Document:

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                                                                   EXHIBIT 10.26

                                                                 August 24, 1998

       THIS WARRANT AND ANY SECURITIES ACQUIRED UPON THE EXERCISE OF THIS
       WARRANT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
       AMENDED (THE "ACT"), OR THE SECURITIES LAWS OF ANY STATE AND NEITHER THIS
       WARRANT, SUCH SECURITIES NOR ANY INTEREST THEREIN MAY BE SOLD,
       TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN
       EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT AND APPLICABLE STATE
       SECURITIES LAWS OR PURSUANT TO A WRITTEN OPINION OF COUNSEL SATISFACTORY
       TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

       NEITHER THIS WARRANT NOR THE SECURITIES ACQUIRED UPON EXERCISE OF THIS
       WARRANT MAY BE SOLD, PLEDGED OR OTHERWISE TRANSFERRED, IN WHOLE OR IN
       PART, WITHOUT THE PRIOR WRITTEN CONSENT OF THE ISSUER.

                           OPTIMARK TECHNOLOGIES, INC.

                          COMMON STOCK PURCHASE WARRANT

       THIS CERTIFIES THAT, for value received, Francis X. Egan, or his
permitted assigns (the "Holder"), is entitled to subscribe for and purchase up
to Forty Thousand (40,000) validly issued, fully paid and nonassessable shares
("Warrant Shares") of voting Common Stock of OptiMark Technologies, Inc., a
Delaware corporation (the "Company"), at the exercise price to be determined in
accordance with Section 2 below (the "Exercise Price"), subject to the terms,
conditions and adjustments hereinafter set forth.

       1.     Definitions. As used in this Warrant, in addition to other
capitalized terms defined elsewhere herein, the following terms have the
meanings indicated:

              "Act" means the Securities Act of 1933, as amended, and the Rules
              and Regulations promulgated thereunder.

              "Additional Shares" has the meaning specified in Section 6(b)(ii)
               below.

              "Additional Warrant" has the meaning specified in Section 6(b)(ii)
               below.

              "Board of Directors" means the board of directors of the Company,
              as constituted from time to time.

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              "Business Day" means any day other than a Saturday, Sunday or a
day on which national banks are authorized by law to close in the  State of New
York.

              "Capital Stock" means, with respect to any Person, any and all
shares, interests, participations, rights in, or other equivalents (however
designated and whether voting or non-voting) of, such  Person's capital stock
and any and all rights, warrants or options exchangeable for or convertible
into such capital stock.

              "Common Stock" means the voting and nonvoting common stock, $.01
par value per share, of the Company, or any other capital stock of the Company
into which such stock is reclassified or  reconstituted.

              "Company" has the meaning specified on the cover of this Warrant.

              "Distribution" has the meaning specified in Section 6(b)(i) below.

              "Exercise Date" has the meaning specified in Section 3(d) below.

              "Exercise Form" means an Exercise Form in the form annexed hereto
              as Exhibit A.

              "Exercise Period" has the meaning specified in Section 2(a) below.

              "Expiration Date" means the fifth anniversary of the Warrant Issue
              Date.

              "Fair Market Value" means the amount that a willing buyer would
pay a willing seller in an arm's length transaction, as reasonably determined by
the Board of Directors in good faith.

              "Person" means any individual, firm, corporation, partnership,
limited liability company, trust, incorporated or unincorporated association,
joint venture, joint stock company, governmental authority or other entity of
any kind, and shall include any successor (by merger or otherwise) of such
entity.

              "Transaction" has the meaning specified in Section 7 below.

              "Warrant Issue Date" means August 24, 1998.

       2.     Exercise of Warrant.

              (a)    Term of Warrant. Subject to the terms and conditions set
forth herein, including but not limited to the vesting schedule set forth in
Section 3(a) below, this Warrant may be exercised, in whole or in part, by the
Holder at any time, or from time to time, during the term commencing on first
anniversary of the Warrant Issue Date and ending at 5:00 p.m., New York City

<PAGE>   3

time on the Expiration Date (the "Exercise Period"). This Warrant shall expire
on the Expiration Date if and to the extent not exercised by the Holder during
the Exercise Period.

              (b)    Exercise Price. Subject to potential adjustment from time
to time pursuant to Section 6 hereof, this Warrant shall be exercisable at an
Exercise Price of Ten Dollars ($10.00) per share of Common Stock.

       3.     Vesting; Method of Exercise; Payment; Stock Certificates.

              (a)    Vesting. The purchase rights represented by this Warrant
may be exercised by the Holder only in accordance with the vesting schedule set
forth herein. During the period beginning on the first anniversary of the
Warrant Issue Date and ending on the second anniversary of the Warrant Issue
Date, the purchase rights represented by this Warrant may be exercised by the
Holder only as to 13,334 Warrant Shares (subject to adjustment as provided for
herein). During the period beginning on the second anniversary date of the
Warrant Issue Date and ending on the third anniversary of the Warrant Issue
Date, the purchase rights represented by this Warrant may be exercised by the
Holder only as to 26,667 Warrant Shares (subject to adjustment as provided
herein), less the number of Warrant Shares previously purchased pursuant to the
exercise of this Warrant. During the period beginning on the third anniversary
of the Warrant Issue Date and ending on the Expiration Date, the purchase rights
represented by this Warrant may be exercised by the Holder as to the full 40,000
Warrant Shares (subject to adjustment as provided for herein) to which this
Warrant is subject, less the number of Warrant Shares previously purchased
pursuant to the exercise of this Warrant.

              (b)    Method of Exercise; Payment of Purchase Price. Subject to
the vesting schedule set forth above, the purchase rights represented by this
Warrant may be exercised by the Holder, in whole or in part, at any time, or
from time to time, during the Exercise Period by the surrender of this Warrant
(with a duly executed Exercise Form specifying the number of Warrant Shares to
be purchased) at the principal office of the Company, and by the payment to the
Company in cash, by certified, cashier's or other check acceptable to the
Company, of an amount equal to the aggregate Exercise Price for those Warrant
Shares specified in the Exercise Form.

              (c)    Stock Certificates. In the event of the exercise of the
rights represented by this Warrant as provided above, the Company shall promptly
(i) issue and deliver to the Holder, one or more certificates representing the
shares of voting Common Stock so purchased by the Holder, in such name or names
as may be designated by the Holder, and (ii) if applicable, cash in lieu of any
fraction of a share.

              (d)    When Exercise Effective. The exercise of this Warrant shall
be deemed effective immediately prior to the close of business on the Business
Day on which this Warrant is surrendered to the Company as provided in this
Section 3 (the "Exercise Date"). The Person in whose name any certificate for
shares of Common Stock shall be issuable upon such exercise, as provided in
Section 3(c), shall be deemed to be the record holder of such shares of Common
Stock for all purposes on the Exercise Date. In the event that this Warrant is
exercised in part, the

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Company at its expense will execute and deliver a new Warrant of like tenor
exercisable for the number of Warrant Shares for which this Warrant may still
thereafter be exercised.

       4.     Stock Fully Paid; Reservation of Shares. All of the shares of
Common Stock issuable upon the exercise of the rights represented by this
Warrant will, upon issuance, be duly authorized, validly issued, fully paid and
nonassessable, and free of all taxes, liens and charges with respect to the
issue thereof. During the Exercise Period, the Company shall at all times have
authorized and reserved a sufficient number of shares of its voting Common Stock
to provide for the exercise of the rights represented by this Warrant.

       5.     Fractional Shares. No fractional shares of Common Stock will be
issued in connection with any exercise hereunder. In lieu of such fractional
shares the Company shall make a cash payment therefor based upon the Fair Market
Value of the Common Stock.

       6.     Certain Adjustments.

              (a)    Capital Adjustments. The number of Warrant Shares
purchasable upon the exercise of this Warrant and the Exercise Price then in
effect pursuant to Section 2(b) shall be subject to adjustment as follows:

                             (i) Stock Dividends, Splits, Etc. If at any time
after the Warrant Issue Date (A) the Company shall pay a stock dividend payable
in shares of Common Stock or (B) the number of shares of Common Stock shall be
increased by a subdivision or split-up of shares of Common Stock, then, on the
date of the payment of such dividend or immediately after the effective date of
subdivision or split up, as the case may be, the number of Warrant Shares to be
delivered upon exercise of this Warrant will be increased so that the Holder
will be entitled to receive the number of shares of Common Stock that such
Holder would have owned immediately following such action had this Warrant been
exercised immediately prior thereto, and the Exercise Price will be adjusted as
provided below in paragraph (iii).

                             (ii) Combination of Stock. If the number of shares
of Common Stock outstanding at any time after the Warrant Issue Date shall be
decreased by a combination of the outstanding shares of Common Stock, then,
immediately after the effective date of such combination, the number of Warrant
Shares to be delivered upon exercise of this Warrant will be decreased so that
the Holder thereafter will be entitled to receive the number of shares of
Common Stock that such Holder would have owned immediately following such
action had this Warrant been exercised immediately prior thereto, and the
Exercise Price will be adjusted as provided below in paragraph (iii).

                             (iii) Exercise Price Adjustment. Whenever the
number of Warrant Shares purchasable upon the exercise of this Warrant is
adjusted as provided pursuant to this Section 6(a), the Exercise Price payable
upon the exercise of this Warrant shall be adjusted by multiplying such
Exercise Price immediately prior to such adjustment by a fraction, of which the

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numerator shall be the number of Warrant Shares purchasable upon the
exercise of the Warrant immediately prior to such adjustment, and of which the
denominator shall be the number of Warrant Shares purchasable immediately
thereafter; provided, however, that the Exercise Price for each Warrant Share
shall in no event be less than the par value of such Warrant Share.

              (b)    Certain Distributions.

                             (i)  Exercise Price Adjustment. In case the
Company shall at any time or from time to time distribute to all or
substantially all of the holders of shares of its Common Stock (including, but
not limited to, any distribution made in connection with a merger or
consolidation in which the Company is the resulting or surviving Person and the
Common Stock is not changed or exchanged) cash, evidences of indebtedness of
the Company or another Person, securities of the Company or another Person, or
other assets (excluding dividends payable in shares of Common Stock for which
adjustment is made under Section 6(a)(i)) or rights or warrants to subscribe
for or purchase the foregoing (each, a "Distribution"), then, and in each such
case, the Exercise Price then in effect shall be adjusted (and any other
appropriate actions shall be taken by the Company) by multiplying the Exercise
Price in effect immediately prior to the date of such distribution by a
fraction (A) the numerator of which shall be the Fair Market Value of the
Common Stock less the Fair Market Value of the amount of cash, evidences of
indebtedness, securities or other assets so distributed or of such subscription
rights or warrants applicable to one share of Common Stock and (B) the
denominator of which shall be the Fair Market Value of the Common Stock, all as
determined on the record date referred to below. Such adjustment shall be made
whenever any distribution is made and shall become effective retroactively to
the date immediately following the close of business on the record date for the
determination of stockholders entitled to receive such distribution.

                             (ii) Additional Shares. In addition to the
Exercise Price adjustment pursuant to clause (i) above, in case the Company
shall at any time or from time to time distribute to all or substantially all
of the holders of shares of its Common Stock (including, but not limited to,
any distribution made in connection with a merger or consolidation in which the
Company is the resulting or surviving Person and the Common Stock is not
changed or exchanged) securities of the Company or another Person (the
"Additional Shares"), then, and in each such case, the Company shall, at its
expense, cause an additional warrant (the "Additional Warrant"), substantially
in the form of this Warrant, to be issued by such Person or the Company, as the
case may be, to evidence the Holder's right to acquire the kind and amount of
Additional Shares receivable by a holder of the number of shares of Common
Stock that such Holder would have been entitled to receive upon exercise of
this Warrant had this Warrant been exercised immediately before such
Distribution is made, subject to adjustments that shall be as nearly equivalent
as practicable to the adjustments provided for in this Section 6. The
Additional Warrant shall be subject to adjustments that shall be as nearly
equivalent as practicable to the adjustments provided in this Section 6. The
exercise price for each Additional Share shall be reasonably determined by the
Board of Directors in good faith after considering the relationship that exists
(as of the date of the issuance of the Additional Warrant) between the Exercise
Price and the Fair Market Value of each Warrant Share;

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provided, however, that such exercise price shall in no event be greater than
the amount by which the Exercise Price was decreased pursuant to clause (i)
above.

                     (c)    No Adjustment. If the Company shall take a record
of the  holders of its Common Stock for the purpose of entitling them to
receive a dividend or other distribution, and shall thereafter and before the
distribution to stockholders thereof legally abandon its plan to pay or deliver
such dividend or distribution, then thereafter no adjustment in the number of
Warrant Shares and/or the Exercise Price then in effect shall be required by
reason of the taking of such record.`

                    (d)    Similar Actions. In the case the Company, at any
time or  from time to time, shall take any action affecting its Common Stock
similar to or having an effect similar to any of the actions described in
Section 6(a) or (b) (but not including any action described in any such
subsections) and the Board of Directors in good faith determines that it would
be equitable in the circumstances to adjust the number of Warrant Shares and/or
the Exercise Price as a result of such action, then, and in each such case, the
number of Warrant Shares and/or the Exercise Price shall be adjusted in such
manner and at such time as the Board of Directors of the Company in good faith
determines would be equitable in the circumstances (such determination to be
evidenced in a resolution, a certified copy of which shall be mailed to the
Holder).

       7.     Reorganization, etc. If any capital reorganization of the Company,
or any reclassification of the Common Stock, or any consolidation of the Company
with or merger of the Company with or into any other Person (other than a
consolidation or merger in which the Corporation is the resulting or surviving
Person which does not result in any reclassification or change of outstanding
Common Stock) or any sale, lease or other transfer of all or substantially all
of the assets of the Company to any other Person (each, a "Transaction"), shall
be effected in such a way that the holders of Common Stock shall be entitled to
receive stock, other securities or assets (whether such stock, other securities
or assets are issued or distributed by the Company or another Person), in lieu
of or in addition to cash, with respect to or in exchange for Common Stock,
then, upon exercise of this Warrant, the Holder shall have the right to receive
the same kind and amount of stock, other securities, cash and/or assets
receivable upon such reorganization, reclassification, consolidation, merger or
sale, lease or other transfer by a holder of the number of shares of Common
Stock that such Holder would have been entitled to receive upon exercise of this
Warrant had this Warrant been exercised immediately before such reorganization,
reclassification, consolidation, merger or sale, lease or other transfer,
subject to adjustments that shall be as nearly equivalent as may be practicable
to the adjustments provided for in Section 6.

       8.     Notices of Adjustment. Whenever the Exercise Price and/or
the number of Warrant Shares purchasable hereunder shall be adjusted pursuant to
Section 6 hereof, the Company shall deliver to the Holder a certificate setting
forth, in reasonable detail, the event requiring the adjustment, the amount of
the adjustment, the method by which such adjustment was calculated, and the
Exercise Price and the number of Warrant Shares purchasable hereunder after
giving effect to such adjustment.

<PAGE>   7

       9.     Notices of Corporate Action. Prior to the Expiration Date, if this
Warrant has not theretofore been exercised in full, then in the event of:

              (a)    any taking by the Company of a record of the holders of its
Capital Stock for the purpose of determining the holders thereof who are
entitled to receive any dividend or other distribution, or any right to
subscribe for, purchase or otherwise acquire any shares of stock of any class or
any other securities or property, or to receive any other right;

              (b)    any capital reorganization of the Company, any
reclassification or recapitalization of any Capital Stock of the Company, any
consolidation or merger involving the Company and any other Person, or any
transfer of all or substantially all the assets of the Company to any other
Person; or

              (c)    any voluntary or involuntary dissolution, liquidation or
winding-up of the Company;

the Company will mail to the Holder a notice specifying (x) the date or expected
date on which any such record is to be taken for the purpose of such dividend,
distribution or right and the amount and character of any such dividend,
distribution or right, and (y) the date or expected date on which any such
reorganization, reclassification, recapitalization, consolidation, merger,
transfer, dissolution, liquidation or winding-up is to take place and the time,
if any, as of which the holders of record of Capital Stock (or other securities)
shall be entitled to exchange their shares of Capital Stock (or other
securities) for the securities or other property deliverable upon such
reorganization, reclassification, recapitalization, consolidation, merger,
transfer, dissolution, liquidation or winding-up. Such notice shall be delivered
at least 10 days prior to the date therein specified, in the case of any date
referred to in the foregoing clauses (x) and (y).

       10.    Representations of the Company. The Company represents and
warrants that all corporate actions on the part of the Company, its officers,
directors and stockholders necessary for the issuance of this Warrant, for the
sale and issuance of the shares of Common Stock pursuant hereto, and for the
performance of the Company's obligations hereunder, were taken prior to and are
effective as of the Warrant Issue Date.

       11.    Representations and Warranties by the Holder. The Holder
represents and warrants to the Company as follows:

              (a)    This Warrant is being acquired and any Warrant Shares will
be acquired for the Holder's own account, for investment and not with a view to,
or for resale in connection with, any distribution or public offering thereof
within the meaning of the Act.

              (b)    The Holder understands that this Warrant has not been and
the Warrant Shares will not be registered under the Act by reason of their
issuance in a transaction exempt from the registration and prospectus delivery
requirements of the Act pursuant to Section 4(2) and/or Section 506 of
Regulation D thereof. Accordingly, this Warrant and the Warrant Shares must be

<PAGE>   8

held by the Holder indefinitely, and the Holder must therefore bear the economic
risk of such investment indefinitely, unless a subsequent disposition thereof is
registered under the Act or is exempted from such registration.

              (c)    The Holder has such knowledge and experience in financial
and business matters that he is capable of evaluating the merits and risks of
the purchase of this Warrant and the Warrant Shares and of protecting his
interests in connection therewith.

              (d)    The Holder is able to bear the economic risk of the
purchase of Warrant Shares pursuant to the terms of this Warrant.

       12.    Replacement of Warrant. On receipt by the Company of an affidavit
of the Holder stating the circumstances of the loss, theft, destruction or
mutilation of this Warrant (and in the case of any such mutilation, on surrender
and cancellation of such Warrant), the Company, at its expense, shall promptly
execute and deliver, in lieu thereof, a new Warrant of like tenor.

       13.    Restrictions on Transfer; Restrictive Legends.

              (a)    Neither this Warrant nor any Warrant Shares may be sold,
pledged or otherwise transferred, in whole or in part, to any Person without the
prior written consent of the Company.

              (b)    Each Warrant issued in substitution for this Warrant shall
be stamped or otherwise imprinted with legends in substantially the following
form:

              THIS WARRANT AND ANY SECURITIES ACQUIRED UPON THE EXERCISE OF THIS
              WARRANT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
              AS AMENDED (THE "ACT"), OR THE SECURITIES LAWS OF ANY STATE, AND
              NEITHER THIS WARRANT, SUCH SECURITIES NOR ANY INTEREST THEREIN MAY
              BE SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT
              PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT AND
              APPLICABLE STATE SECURITIES LAWS OR PURSUANT TO A WRITTEN OPINION
              OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS
              NOT REQUIRED.

              NEITHER THIS WARRANT NOR THE SECURITIES ACQUIRED UPON EXERCISE OF
              THIS WARRANT MAY BE SOLD, PLEDGED OR OTHERWISE TRANSFERRED, IN
              WHOLE OR IN PART, WITHOUT THE PRIOR WRITTEN CONSENT OF THE ISSUER.

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              (c)    Each stock certificate for Warrant Shares issued upon
the exercise of any Warrant and each stock certificate issued upon the direct or
indirect transfer of any Warrant Shares shall be stamped or otherwise imprinted
with legends in substantially the following form:

              THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
              REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
              "ACT"), OR THE SECURITIES LAWS OF ANY STATE. THE SECURITIES MAY
              NOT BE SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT
              PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT AND
              APPLICABLE STATE SECURITIES LAWS OR PURSUANT TO A WRITTEN OPINION
              OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS
              NOT REQUIRED.

              THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY NOT BE SOLD,
              PLEDGED OR OTHERWISE TRANSFERRED, IN WHOLE OR IN PART, WITHOUT THE
              PRIOR WRITTEN CONSENT OF THE ISSUER.

       14.    Rights of Stockholders. This Warrant shall not entitle its Holder
to any of the rights of a stockholder of the Company.

       15.    Successors and Assigns. The provisions of this Warrant shall inure
to the benefit of and be binding upon the Company, the Holder and their
respective permitted assigns. Nothing in this Warrant, express or implied, is
intended to confer upon any party other than the parties hereto or their
respective successors and permitted assigns any rights, remedies, obligations or
liabilities under or by reason of this Warrant, except as expressly provided in
this Warrant.

       16.    Amendment or Waiver. This Warrant and any term hereof may be
amended, waived, discharged or terminated only by and with the written consent
of the Company and the Holder.

       17.    Specific Performance. The parties hereto intend that each of the
parties have the right to seek damages or specific performance in the event that
any other party hereto fails to perform such party's obligations hereunder.
Therefore, if any party shall initiate any action or proceeding to enforce the
provisions hereof, any party against whom such action or proceeding is brought
hereby waives any claim or defense therein that the plaintiff party has an
adequate remedy at law.

       18.    Charges, Taxes and Expenses. Issuance of certificates representing
Warrant Shares shall be made without charge to the Holder for any issue or
transfer tax, or other incidental expense, in respect of the issuance or
delivery of such certificates or the securities represented thereby, all of
which taxes and expenses shall be paid by the Company; provided, however, the
Company shall not be required (a) to pay any tax or other incidental expense
which may be payable in respect of (i) any transfer or delivery of this Warrant
by the Holder to another Person or (ii) the issuance or delivery

<PAGE>   10

of certificates representing Warrant Shares to a Person other than the Holder,
or (b) to issue or deliver certificates representing Warrant Shares to a Person
other than the Holder until any such tax payable by the Holder as provided in
clause (ii) above shall have been paid or until it has been established to the
Company's reasonable satisfaction that no such tax is due.

       19.    Notices. All notices, demands and other communications provided
for or permitted hereunder shall be made in writing and shall be made by
registered or certified first-class mail, return receipt requested, courier
service, overnight mail or personal delivery as follows:

       (a) if to the Company:

                       OptiMark Technologies, Inc.
                       530 Main Avenue
                       Durango, CO 81301
                       Telecopy:  (970) 247-8844
                       Attention:  William A. Lupien

                       with a copy to:

                       OptiMark Technologies, Inc.
                       530 Main Avenue
                       Durango, CO 81301
                       Telecopy:  (970) 247-8844
                       Attention: General Counsel

       (b) if to the Holder:

                     to the address of the Holder as set forth in the records
                     of the Company

       All such notices and communications shall be deemed to have been duly
given when delivered by hand, if personally delivered; when delivered by courier
or overnight mail, if delivered by commercial courier service or overnight mail;
and five (5) Business Days after being deposited in the mail, postage prepaid,
if mailed.

       20.    GOVERNING LAW. THIS WARRANT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD TO THE
PRINCIPLES OF CONFLICTS OF LAW THEREOF.

       21.    Headings. The headings in this Warrant are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

<PAGE>   11

       22.    Severability. Any term or provision of this Warrant which is
 invalid or unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such invalidity or unenforceability without
rendering invalid or unenforceable the terms and provisions of this Warrant or
affecting the validity or enforceability of any of the terms or provisions of
this Warrant in any other jurisdiction.

                             OPTIMARK TECHNOLOGIES, INC.

                             By:  /s/  William A. Lupien
                                      William A. Lupien, Chief Executive Officer

ACKNOWLEDGED AND AGREED:

/s/  Francis X. Egan

<PAGE>   12

                                                                       Exhibit A

                                  EXERCISE FORM

                  (To be executed upon exercise of the Warrant)

       Reference is made to the attached Common Stock Purchase Warrant. The
undersigned hereby irrevocably elects to exercise the right, represented by the
attached Warrant, to purchase __________ Warrant Shares and herewith tenders
payment for such Warrant Shares to the order of OptiMark Technologies, Inc. in
the amount of $__________ in accordance with the terms of the Warrant. The
undersigned requests that a certificate for such Warrant Shares be registered in
the name of the undersigned and that such certificate be delivered to the
undersigned's address below.

            If such number of Warrant Shares purchased shall not be all of the
Warrant Shares evidenced by the Warrant, the undersigned requests that a new
Warrant of like tenor for the balance remaining of such Warrant Shares be
registered in the name of the undersigned and that such Warrant be delivered to
the undersigned's address below.

Dated:
       ----------------------
                                              Signature
                                                       ----------------------

                                               ------------------------------
                                              (Print Name)

                                               ------------------------------
                                              (Street Address)

                                               ------------------------------
                                              (City)   (State)  (Zip Code)

Signed in the presence of:

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

                                      -1-<PAGE>   1
                                                                   EXHIBIT 10.27

                                                                [Execution Copy]

================================================================================

                           OPTIMARK TECHNOLOGIES, INC.

                                       and

                          THE NASDAQ STOCK MARKET, INC.

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

                                WARRANT AGREEMENT

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

                          Dated as of September 1, 1998

================================================================================

<PAGE>   2
                              TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                                                             Page
                                                                                                                             ----
<S>                                                                                                                        <C>
Section 1.  Definitions..........................................................................................................1

Section 2.  Issuance of Warrants.................................................................................................5

Section 3.  Review of the Company................................................................................................7

Section 4.  Warrant Certificates.................................................................................................7

Section 5.  Registration and Countersignature....................................................................................8

Section 6.  Restrictions on Transfer of Warrants and Warrant Shares..............................................................8

Section 7.  Registration of Transfers and Exchanges..............................................................................9

Section 8.  Terms of Warrants; Exercise of Warrants..............................................................................9

            (a)         Terms of Warrants........................................................................................10
            (b)         Exercise of Warrants.....................................................................................10

Section 9.  Registration Rights..................................................................................................11

Section 10.  Dissolution, Liquidation or Winding Up..............................................................................11

Section 11. Adjustments to Warrant Exercise Price and Warrant Exercise Number  for Diluting Issues ..............................12

            (a)  Issue of Securities Deemed Issue of Additional Shares of Common Stock...........................................12
            (b)  Adjustment of Warrant Exercise Price Upon Issuance of Additional Shares of Common Stock.........................14
            (c)  Determination of Consideration..................................................................................14
            (d)  Adjustment for Stock Dividends, Distributions, Subdivisions, Combinations or Consolidation of Common Stock......15
            (e)  Adjustments for Consolidation, Merger, Sale of Assets, Reorganization; Etc......................................16
            (f)  Distributions of Cash, Debt and Other Assets....................................................................16
            (g)  Adjustment of Warrant Exercise Number...........................................................................17
</TABLE>

<PAGE>   3

<TABLE>
<S>                                                                                                                          <C>
Section 12.  No Dilution or Impairment...........................................................................................17

Section 13.  Payment of Taxes....................................................................................................17

Section 14.  Mutilated or Missing Warrant Certificates...........................................................................17

Section 15.  Reservation of Warrant Shares.......................................................................................18

Section 16.  Fractional Interests................................................................................................18

Section 17.  Notices to Holders..................................................................................................18

Section 18.  Notices to Company..................................................................................................19

Section 19.  Termination.........................................................................................................20

Section 20.  Supplements and Amendments..........................................................................................20

Section 21.  Successors..........................................................................................................21

Section 22.  Governing Law.......................................................................................................21

Section 23.  Benefits of This Agreement..........................................................................................21

Section 24.  Counterparts........................................................................................................21
</TABLE>

SIGNATURES  22

EXHIBIT A -      FORM OF WARRANT CERTIFICATE

EXHIBIT B -      FORM OF REGISTRATION RIGHTS AGREEMENT

<PAGE>   4

     WARRANT AGREEMENT dated as of September 1, 1998 among OptiMark
Technologies, Inc., a Delaware corporation (the "Company"), and The Nasdaq Stock
Market, Inc. ("Nasdaq" or "Purchaser").

                                    RECITALS

          The Company proposes to issue Common Stock Purchase Warrants, as
hereinafter described (the "Warrants"), to purchase up to an aggregate of
11,250,000 shares of Common Stock, par value $0.01 per share (the "Common
Stock") of the Company as such number may be adjusted in accordance with the
terms hereof (the Common Stock issuable on exercise of the Warrants being
referred to herein as the "Warrant Shares").

                                    AGREEMENT

          NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein set forth, the parties hereto agree as follows:

          Section 1. Definitions. As used in this Agreement, the following terms
have the meanings indicated:

          "Additional Shares of Common Stock" shall mean all shares of Common
Stock of the Company and all equivalents thereof, including all Options and all
Convertible Securities and all other securities exchangeable for, or convertible
into, such Common Stock, and all options, warrants and subscription and other
rights to purchase or otherwise acquire such Common Stock, but excluding (i)
shares issued or issuable upon exercise of the Warrants provided for in this
Agreement, (ii) shares issuable upon exercise of (x) that certain Common Stock
Purchase Warrant, dated as of August 27, 1996, to the Pacific Exchange, Inc. for
the purchase of up to an aggregate amount of 2,104,000 shares of Common Stock of
the Company, (y) that certain Common Stock Purchase Warrant, dated as of
December 31, 1997, to the Chicago Board of Options Exchange Incorporated for the
purchase of up to an aggregate amount of 1,000,000 shares of Common Stock of the
Company and (z) that certain Warrant to Purchase Common Stock, dated as of May
29, 1997, to Dow Jones & Company, Inc. for the purchase of up to an aggregate
amount of 2,161,764 shares of Common Stock of the Company, (iii) shares issued
or issuable directly to, Options issued to, and shares issued or issuable upon
the exercise of Options granted to, employees, former employees, officers,
directors and consultants of the Company and its Subsidiaries, or (iv) shares
issued or issuable upon conversion of the Series A Preferred Stock of the
Company.

          "Affiliate" means, with respect to any Person, any Person that,
directly or indirectly, controls, is controlled by or is under common control
with such Person. For the purposes of this definition, "control" (including,
with correlative meanings, the terms "controlled by" and "under common control
with"), as used with respect to any Person, means the power to direct the
management and policies of such Person, directly or indirectly, whether through
the ownership of voting securities, by contract or otherwise.

<PAGE>   5

          "Agreement" means this Agreement, as the same may be amended from time
to time.

          "Board of Directors" means the Board of Directors of the Company.

          "Business Day" means any day other than a Saturday, Sunday or other
day on which banks in the city of New York are authorized or required by law to
close.

          "Capital Stock" means any and all shares, interests, participations,
rights or other equivalents (however designated) of corporate stock or other
equity interests, including, without limitation, partnership interests and
mandatorily redeemable preferred stock, whether or not included in shareholders'
equity, and any warrants or options to acquire such Capital Stock.

          "Cashless Exercise Notice" shall have the meaning set forth in Section
8(b).

          "Common Stock" has the meaning set forth in the Recitals.

          "Company" means the party named as such above in the Preamble, and its
successors and assigns.

          "Convertible Securities" means any evidences of indebtedness, shares
of stock, options, warrants or other securities which are convertible into or
exchangeable, with or without payment of additional consideration of cash or
property, for shares of Common Stock or rights to acquire shares of Common
Stock, either immediately or on a specified date or the happening of a specified
event.

          "Distribution" shall have the meaning set forth in Section 11(f).

          "Early Measurement Period" has the meaning set forth in Section 2(b).

          "End-Users" shall mean a person using a Nasdaq Workstation or other
terminal linked to the Nasdaq Application who submits profile orders through the
Nasdaq Application and is informed as to which orders have been executed through
the OptiMark System.

          "Equity Interests" means Capital Stock or other equity participations,
including partnership interests, or warrants, options or rights to acquire
Capital Stock or other equity participations (but excluding any debt security
that is convertible into, or exchangeable for, Capital Stock or other such
equity participations).

          "Exchange Act" means the Securities Exchange Act of 1934, as amended,
and the rules and regulations promulgated by the SEC thereunder.

          "Expiration Date" shall mean the earlier of (i) the last day that the
Nasdaq Application continues to be available on all Nasdaq Workstation
Presentation Devices and (ii) the fifth (5th) anniversary of the Warrant
Commencement Date.

                                      -2-

<PAGE>   6

          "Fair Market Value" shall mean, with respect to any asset or property,
including, without limitation, Common Stock, the price which could be negotiated
in an arm's length, free market transaction, for cash, between a willing seller
and a willing buyer, neither of whom is under any pressure or compulsion to
complete the transaction, in each case as determined reasonably and in good
faith by the Board of Directors; provided that if shares of Common Stock are
traded or quoted, as the case may be (x) on the National Association of
Securities Dealers' Automated Quotation System ("NASDAQ") National Market
System, (y) in the over-the-counter market or (z) on a National Securities
Exchange, the "Fair Market Value" per share of Common Stock at any date shall be
deemed to be the average daily Closing Prices of the shares of Common Stock for
the 15 consecutive trading days commencing 20 trading days before the day in
question. As used in herein, the term "Closing Price" of the shares of Common
Stock for a day or days shall mean (a) if the shares of Common Stock are not
listed or admitted for trading on a National Securities Exchange, (i) the last
transaction price of the shares of Common Stock on the NASDAQ National Market
System or, in the case no such reported transaction takes place on such day or
days, the average of the reported closing bid and asked prices thereof quoted on
the NASDAQ National Market System, or (ii) if the shares of Common Stock are not
quoted on the NASDAQ National Market System, the average of the closing bid and
asked prices of the shares of Common Stock in the over-the-counter market, as
reported by the National Quotation Bureau, Inc., or an equivalent generally
accepted reporting service or (b) if the shares of Common Stock are listed or
admitted for trading on a National Securities Exchange, the last reported sales
price regular way, or in case no such reported sale takes place on such day or
days, the average of the reported closing bid and asked prices regular way, in
either case on the principal National Securities Exchange on which the shares of
Common Stock are listed or admitted for trading.

          "Holder" or "Warrantholder" means the Person in whose name a Warrant
is registered.

          "Listed Securities" shall mean all securities listed on The New York
Stock Exchange and the American Stock Exchange and traded through the OptiMark
System outside of the Nasdaq Application.

          "Measurement Period" has the meaning set forth in Section 2(b).

          "NASD" shall mean the National Association of Securities Dealers, Inc.

          "Nasdaq" shall mean the party named as such above in the Preamble and
any and all successors and permitted assigns thereof.

          "Nasdaq Application" shall mean all of the facilities offered jointly
by Nasdaq and OptiMark to End Users that enable End Users to use the Nasdaq
Application for executions in Nasdaq Securities.

          "Nasdaq Workstation Presentation Devices" shall have the meaning
assigned to it in the Operating Agreement.

                                      -3-

<PAGE>   7

          "Nasdaq Securities" shall mean securities traded in Nasdaq.

          "National Securities Exchange" shall mean an exchange registered under
Section 6 of the Exchange Act.

          "Operating Agreement" shall mean that Agreement, of even date
herewith, between the Company and Nasdaq regarding the development,
implementation and operation of a facility to be offered on the "Nasdaq Stock
Market" (as defined in NASD Rule 4200(a)) that will be an application based upon
the Company's patented or other technology.

          "OptiMark System" shall mean the computer software and related systems
with which the Company implements its technology and applies it for the use of
organizations such as the NASD.

          "Options" shall mean rights, options or warrants to subscribe for,
purchase or otherwise acquire either Additional Shares of Common Stock or
Convertible Securities.

          "Permitted Third Party Transferee" shall have the meaning provided in
Section 6(a).

          "Person" means an individual or a corporation, partnership, trust,
incorporated or unincorporated association, joint venture, joint stock company,
government (or any agency or political subdivision thereof) or other entity of
any kind.

          "Purchaser Affiliate" shall have the meaning provided in Section 6(a).

          "Revenue Equivalent Volume" shall mean an amount equal to the product
of (x) the fraction (1) the numerator of which is the gross transaction revenue
per share for trades in the Nasdaq Application and (2) the denominator of which
is the gross transaction revenue per share for all Listed Securities traded
through the Optimark System and (y) the number of shares traded in the Nasdaq
Application; provided that if there is no volume of Listed Securities processed
through the OptiMark System outside the Nasdaq Application, "Revenue Equivalent
Volume" shall mean the actual number of shares traded in the Nasdaq Application.

          "SEC" means the United States Securities and Exchange Commission.

          "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations promulgated by the SEC thereunder.

          "Sixth Month Measurement Period" has the meaning set forth in Section
2.

          "Subsidiary" means, with respect to any Person, any corporation,
association or other business entity of which more than 50% of the total voting
power of shares of Capital Stock or other Equity Interests entitled (without
regard to the occurrence of any contingency) to vote in the election of
directors or other managing authority thereof is at the time owned or
controlled, directly or indirectly, by such Person and its Subsidiaries.

                                      -4-

<PAGE>   8

          "Transfer Notice" has the meaning set forth in Section 6.

          "Warrant Certificates" has the meaning set forth in Section 4.

          "Warrant Commencement Date" shall mean the first date following the
Operational Commencement Date (as defined in the Operating Agreement) upon which
Nasdaq makes available for trading through the Nasdaq Application all of the
issues of Nasdaq Securities, subject to any and all limitations and constraints
upon Nasdaq's ability to make available for trading through the Nasdaq
Application Nasdaq Securities as a result of any and all (i) applicable (x) laws
or (y) rules, regulations or pronouncements of the United States Securities and
Exchange Commission or any National Securities Exchange, self-regulatory
organization (as such term is defined in Section 3(a)(26) of the Securities
Exchange Act of 1934, as amended) or other governmental or quasi-governmental
authority and/or (ii) systems or capacity restraints of Optimark or the Nasdaq
Application; provided that in no event shall a decision by Optimark to trade
less than all Nasdaq Securities through the Nasdaq Application (without the
proviso creating any right of, or implication that, Optimark has the right to
make such a decision) effect the Warrant Commencement Date.

          "Warrant Exercise Number" shall mean the number of Warrant Shares
issuable upon the exercise of each Warrant.

          "Warrant Exercise Period" shall mean for each Warrant, the period
beginning on the Warrant Commencement Date and ending on the Expiration Date,
provided that the Warrant Exercise Period shall automatically be extended ninety
(90) days beyond the Expiration Date in order to permit the Holder to exercise
any Warrant that is issuable or that shall be issued by the Company as a result
of the average daily volume in Nasdaq Securities during any six (6) month period
ending within thirty (30) days of the Expiration Date.

          "Warrant Exercise Price" has the meaning set forth in Section 2.

          "Warrant Register" has the meaning set forth in Section 5.

          "Warrantholder" means the Person in whose name a Warrant is
registered.

          "Warrant Shares" has the meaning set forth in the Recitals.

          "Warrants" has the meaning set forth in the Recitals.

          Section 2. Issuance of Warrants. The Purchaser may acquire Warrants,
which shall be immediately exercisable upon receipt thereof, to purchase up to
11,250,000 shares of Common Stock (as such number may be adjusted in accordance
with the terms hereof) in accordance with the following issuance schedule:

          (a) Availability of Nasdaq Workstation Presentation Devices. Upon the
     Warrant Commencement Date, the Purchaser shall receive two Warrants to
     purchase 2,250,000 shares of Common Stock each. The exercise price (as such
     price may be adjusted in accordance with the terms hereof, the "Warrant
     Exercise Price") for the first

                                      -5-

<PAGE>   9

     Warrant shall be $5.00 per share, and the Warrant Exercise Price for
     the second warrant shall be $7.00 per share. If (x) the Warrant
     Commencement Date occurs by September 30, 1999 and (y) the average daily
     volume of Nasdaq Securities traded through the Nasdaq Application during
     the first six (6) month period following the Warrant Commencement Date
     equals or exceeds 10,000,000 shares, the Warrant Exercise Price for both
     Warrants shall be reduced to $3.00 per share.

          (b) The Purchaser shall receive a Warrant to purchase 2,250,000 shares
     of Common Stock at a Warrant Exercise Price of $7.00 per share if for any
     rolling six month period (a "Sixth Month Measurement Period") beginning on
     the first Business Day of a calendar month on or after the second (2nd)
     anniversary of the Warrant Commencement Date and ending on the last
     Business Day of a calendar month on or before the Expiration Date (the
     "Measurement Period"), average daily volume in Nasdaq Securities traded
     through the Nasdaq Application exceeds the average daily volume of Listed
     Securities traded through the OptiMark System; provided, however, that if
     the Purchaser has not satisfied the conditions of this Section 2(b) but
     does satisfy the applicable requirements referred to in Section 2(d), (e)
     and/or (f) for any Six Month Measurement Period beginning on the first
     Business Day of a calendar month on or after the Warrant Commencement Date
     and ending on the last Business Day of a calendar month on or before the
     third (3rd) anniversary of the Warrant Commencement Date (the "Early
     Measurement Period"), each of such Warrants shall be exercisable for an
     additional 750,000 shares; provided further, that the number of shares of
     Common Stock purchasable under the Warrant issued pursuant to this Section
     2(b) shall be permanently reduced by the aggregate number of additional
     shares earned by the Purchaser by virtue of its satisfaction of the
     applicable requirements of Sections 2(d), (e) and/or (f) during the Early
     Measurement Period.

          (c) The Purchaser shall receive a Warrant to purchase 1,125,000 shares
     of Common Stock at a Warrant Exercise Price of $7.00 per share if for any
     Six Month Measurement Period during the Measurement Period the average
     daily Revenue Equivalent Volume of Nasdaq Securities traded through the
     Nasdaq Application equals or exceeds twenty million (20,000,000).

          (d) The Purchaser shall receive a Warrant to purchase 1,125,000 shares
     (or 1,875,000 shares if the Purchaser satisfies the following requirements
     for any Six Month Measurement Period during the Early Measurement Period)
     at a Warrant Exercise Price of $7.00 per share if for any Six Month
     Measurement Period during the Measurement Period the average daily Revenue
     Equivalent Volume of Nasdaq Securities traded through the Nasdaq
     Application equals or exceeds forty million (40,000,000).

          (e) The Purchaser shall receive a Warrant to purchase 1,125,000 shares
     (or 1,875,000 shares if the Purchaser satisfies the following requirements
     for any Six Month Measurement Period during the Early Measurement Period)
     at a Warrant Exercise Price of $7.00 per share if for any Six Month
     Measurement Period during the Measurement Period the average daily Revenue
     Equivalent Volume of Nasdaq Securities traded through the Nasdaq
     Application equals or exceeds eighty million (80,000,000).

                                      -6-

<PAGE>   10

          (f) The Purchaser shall receive a Warrant to purchase 1,125,000 shares
     (or 1,875,000 shares if the Purchaser satisfies the following requirements
     for any Six Month Measurement Period during the Early Measurement Period)
     at a Warrant Exercise Price of $7.00 per share if for any Six Month
     Measurement Period during the Measurement Period the average daily Revenue
     Equivalent Volume of Nasdaq Securities traded through the Nasdaq
     Application equals or exceeds one hundred fifty million (150,000,000).

          The Company and Nasdaq hereby agree to cooperate fully with each other
and to provide the other party with all information necessary to determine if
and when the Purchaser shall receive Warrants and the applicable Warrant
Exercise Price for those Warrants pursuant to this Section 2, including, without
limitation, information regarding and/or necessary to calculate or verify (i)
the average daily volume of Nasdaq Securities traded through the Nasdaq
Application, (ii) the average daily volume of Listed Securities traded through
the Optimark System and (iii) the average daily Revenue Equivalent Volume of
Nasdaq Securities traded through the Nasdaq Application.

          Section 3. Review of the Company. The Company and each of its
subsidiaries shall permit the Purchaser and its representatives to have, at any
time between the Warrant Commencement Date and the Expiration Date, full access,
during normal business hours and on reasonable prior notice, to the premises and
to all the books and records of the Company and its Subsidiaries and to cause
the officers of the Company and each of its Subsidiaries to furnish the
Purchaser with such financial and operating data and other information with
respect to the business and properties of the Company and its Subsidiaries as
the Purchaser shall from time to time reasonably request. The Company shall
deliver or cause to be delivered such additional instruments necessary for the
purpose of consummating the transactions contemplated by this Agreement. Except
as required by law or legal process, the Purchaser is not authorized to disclose
any information obtained pursuant to this Section 3 to any other Person, other
than the Purchaser's legal and financial advisors in connection with its
evaluation thereof, without the prior written consent of the Company, provided
that if any court or other judicial or other governmental authority requests or
requires that Nasdaq disclose any confidential information obtained pursuant to
this Section 3 pursuant to or in accordance with any legal process (including,
without limitation, any subpoena, document request or other court order or
discovery request), Nasdaq shall oppose such request or requirement and, should
such opposition fail, shall use its reasonable best efforts to narrow to the
extent possible the confidential information disclosed pursuant to such request
or requirement and seek to have access to and use of such information limited by
a protective order.

          Section 4. Warrant Certificates. The certificates evidencing the
Warrants (the "Warrant Certificates") to be acquired by the Purchaser pursuant
to the issuance schedule set forth in Section 2 of this Agreement shall be
substantially in the form set forth in Exhibit A attached hereto and shall be
issued promptly by the Company upon satisfaction of the standards set forth in
Section 2 hereof.

          Warrant Certificates shall be signed on behalf of the Company by its
Chairman of the Board or its President or a Vice President and by its Secretary
or an Assistant Secretary.

                                      -7-

<PAGE>   11

Each such signature upon the Warrant Certificates may be in the form of a
facsimile signature of the present or any future Chairman of the Board,
President, Vice President, Secretary or Assistant Secretary and may be imprinted
or otherwise reproduced on the Warrant Certificates and for that purpose the
Company may adopt and use the facsimile signature of any person who shall have
been Chairman of the Board, President, Vice President, Secretary or Assistant
Secretary, notwithstanding the fact that at the time the Warrant Certificates
shall be delivered or disposed of he shall have ceased to hold such office.

          In case any officer of the Company who shall have signed any of the
Warrant Certificates shall cease to be such officer before the Warrant
Certificates so signed shall have been delivered or disposed of by the Company,
such Warrant Certificates nevertheless may be delivered or disposed of as though
such person had not ceased to be such officer of the Company; and any Warrant
Certificate may be signed on behalf of the Company by any person who, at the
actual date of the execution of such Warrant Certificate, shall be a proper
officer of the Company to sign such Warrant Certificate, although at the date of
the execution of this Warrant Agreement any such person was not such officer.

          Warrant Certificates shall be dated the date signed by the Company.

          Section 5. Registration and Countersignature. The Company shall number
and register the Warrant Certificates in a register (the "Warrant Register") as
they are issued.

          The Company shall deliver Warrants entitling the Holders thereof to
purchase not more than the aggregate number of Warrant Shares referred to above
in the first recital hereof and shall sign and deliver Warrants as otherwise
provided in this Agreement.

         The Company may deem and treat the Holders of the Warrant Certificates
as the absolute owners thereof (notwithstanding any notation of ownership or
other writing thereon made by anyone), for all purposes, and the Company shall
not be affected by any notice to the contrary.

          Section 6. Restrictions on Transfer of Warrants and Warrant Shares.

          (a) Subject to Section 6(b), each Warrant may be transferred only (i)
by the Purchaser to any one or more of its Affiliates (a "Purchaser Affiliate"),
(ii) by a Purchaser Affiliate to the Purchaser or one or more other Purchaser
Affiliates, (iii) by the Purchaser or any Purchaser Affiliate to any other
entity, provided that, the Holder of such Warrant or Warrants to be transferred
gives 10 days' prior written notice to the Company of such Holder's intention to
effect such transfer and the Company, at is sole discretion, consents to such
transfer (a "Permitted Third Party Transferee") and (iv) by a Permitted Third
Party Transferee to (x) the Purchaser, (y) a Purchaser Affiliate or (z) another
Permitted Third Party Transferee.

          (b) Except as otherwise permitted by this Section 6, each Warrant
(including each Warrant issued upon the transfer of any Warrant) and each
Warrant Share shall be stamped or otherwise imprinted with a legend in
substantially the following form:

                                      -8-

<PAGE>   12

          THIS [WARRANT/SHARE] HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
     OF 1933, AS AMENDED. THIS [WARRANT/SHARE] MAY NOT BE SOLD OR TRANSFERRED IN
     THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION THEREFROM UNDER SUCH ACT.
     THIS [WARRANT/SHARE] MAY BE TRANSFERRED ONLY IN COMPLIANCE WITH THE
     CONDITIONS SPECIFIED IN THE WARRANT AGREEMENT DATED AS OF SEPTEMBER 1, 1998
     BETWEEN OPTIMARK TECHNOLOGIES, INC. ("OPTIMARK") AND THE NASDAQ STOCK
     MARKET, INC., WHICH CONDITIONS INCLUDE, WITHOUT LIMITATION, THE REQUIREMENT
     THAT, IF REQUESTED BY OPTIMARK, THE HOLDER/TRANSFEROR HEREOF SHALL OBTAIN
     AN OPINION OF COUNSEL (WHICH COUNSEL SHALL BE REASONABLY SATISFACTORY TO
     OPTIMARK), THAT THE PROPOSED TRANSFER OF THIS [WARRANT/SHARE] MAY BE
     EFFECTED WITHOUT REGISTRATION UNDER THE SECURITIES ACT.

          Prior to any transfer or attempted transfer of any Warrants or Warrant
Shares, the Holder of such Warrants or Warrant Shares shall give 10 days' prior
written notice (a "Transfer Notice") to the Company of such Holder's intention
to effect such transfer, describing the manner and circumstances of the proposed
transfer, and, if requested by the Company, obtain from counsel to such Holder
who shall be reasonably satisfactory to the Company, an opinion that the
proposed transfer of such Warrants or Warrant Shares may be effected without
registration under the Securities Act. After receipt of the Transfer Notice and
opinion, the Company shall, within five days thereof, so notify the Holder of
such Warrants or Warrant Shares and such Holder shall thereupon be entitled to
transfer such Warrants or Warrant Shares, in accordance with the terms of the
Transfer Notice. Each Warrant or Warrant Share issued upon such transfer shall
bear the restrictive legend set forth above, unless, in the opinion of such
counsel, such legend is not required in order to ensure compliance with the
Securities Act. The Holder of the Warrants or Warrant Shares giving the Transfer
Notice shall not be entitled to transfer such Warrants or Warrant Shares until
receipt of notice from the Company under this Section 6.

          Section 7. Registration of Transfers and Exchanges. The Company shall
from time to time register in the Warrant Register any transfer permitted in
accordance with Section 6 of any outstanding Warrant Certificates upon surrender
thereof accompanied (if so required by it) by a written instrument or
instruments of transfer in form reasonably satisfactory to the Company, duly
executed by the Holder or Holders thereof or by the duly appointed legal
representative thereof or by a duly authorized attorney-in-fact. Upon any such
registration of transfer, a new Warrant Certificate shall be issued to the
transferee(s) and the surrendered Warrant Certificate shall be cancelled by the
Company. Cancelled Warrant Certificates shall thereafter be disposed of in a
manner satisfactory to the Company.

          Warrant Certificates may be exchanged at the option of the Holder(s)
thereof, when surrendered to the Company at its office for another Warrant
Certificate or other Warrant Certificates of like tenor and representing in the
aggregate a like number of Warrants. Warrant Certificates surrendered for
exchange shall be cancelled by the Company.

                                      -9-

<PAGE>   13

          Section 8. Terms of Warrants; Exercise of Warrants.

          (a) Terms of Warrants. Subject to the terms of this Agreement, each
Holder shall have the right to receive from the Company the number of fully paid
and nonassessable Warrant Shares which the Holder may at the time be entitled to
receive on exercise of such Warrants and payment of the Warrant Exercise Price
then in effect for such Warrant Shares. Each Warrant not exercised prior to 5:00
p.m., New York City time, on the Expiration Date shall become void and all
rights thereunder and all rights in respect thereof under this Agreement shall
cease as of such time.

          (b) Exercise of Warrants. The Warrants shall be immediately
exercisable at the option of the Warrantholder any time after the issuance
thereof. A Warrant shall be exercised by surrender to the Company at its office
of the certificate or certificates evidencing the Warrants to be exercised with
the form of election to purchase on the reverse thereof duly filled in and
signed, which signature shall be guaranteed by a bank or trust company having an
office or correspondent in the United States or a broker or dealer which is a
member of a registered securities exchange or the NASD, and upon payment to the
Company for the account of the Company of the Warrant Exercise Price set forth
in Section 2 hereof, for the number of Warrant Shares in respect of which such
Warrants are then exercised. Alternatively, if at any time when a Warrant is
exercisable, the Fair Market Value of one share of Common Stock is greater than
the Warrant Exercise Price of the applicable Warrant, in lieu of exercising such
Warrant for cash, a Holder may exercise such Warrant by delivering a notice (a
"Cashless Exercise Notice") to the Company of a cashless exercise. Upon delivery
to the Company of a Cashless Exercise Notice, together with surrender of the
applicable Warrant, the Holder shall receive from the Company Warrant Shares
equal to

          A x (Fair Market Value - Warrant Exercise Price)/Fair Market Value

where A = the number of Warrant Shares as to which such Warrant is being
exercised pursuant to a cashless exercise.

          Upon surrender of a Warrant Certificate in conformity with the
foregoing provisions or the delivery to the Company of a Cashless Exercise
Notice, the Company shall transfer to the Holder of such Warrant Certificate
appropriate evidence of ownership of any Warrant Shares or other securities or
property and any money to which the Holder is entitled, registered or otherwise
placed in, or payable to the order of, such name or names as may be directed in
writing by the Holder, and the Company shall deliver such evidence of ownership
and any money to the Person or Persons entitled to receive the same, together
with an amount in cash in lieu of any fraction of a share or Warrant as
hereinafter provided in Section 16. If more than one Warrant Certificate shall
be surrendered for exercise or sale of the Warrants represented thereby at one
time by the same Holder, the total number of full Warrant Shares or other
securities or property (including any money) to which the Holder is entitled
which shall be deliverable upon tender thereof shall be computed on the basis of
the aggregate number of Warrants tendered.

                                      -10-

<PAGE>   14

          A Warrant shall be deemed to have been exercised or sold immediately
prior to the close of business on the date of the surrender for such exercise or
sale of the Warrant Certificate representing such Warrant or the date of
delivery to the Company of a Cashless Exercise Notice in respect of such
Warrant, and for all purposes of this Agreement, the Person entitled to receive
any Warrant Shares or other securities or property (including any money)
deliverable upon such exercise or sale shall, as between such Person and the
Company, be deemed to be the Holder of such Warrant Shares or other securities
or property of record as of the close of business on such date and shall be
entitled to receive any money, Warrant Shares or other securities or property to
which such Holder would have been entitled had such Holder been the record
Holder on such date.

          Without limiting the foregoing, if, at the date referred to above, the
transfer books for the Warrant Shares or other securities to be received upon
the exercise of the Warrants shall be closed, the certificates for the Warrant
Shares or other securities in respect of which such Warrants are then exercised
shall be transferred when such transfer book shall next be opened and until such
date the Company shall be under no duty to deliver any certificates for such
Warrant Shares or other securities; provided, however, that the transfer books
of record, unless required by law, shall not be closed at any time for a period
longer than 20 days.

          The Warrants shall be exercisable, subject to the terms of this
Agreement, at the election of the Holders thereof, either in full or from time
to time in part and, in the event that a certificate evidencing Warrants is
exercised in respect of fewer than all of the Warrant Shares issuable on such
exercise at any time prior to the Expiration Date, the Company will issue and
deliver a new certificate (or certificates) evidencing the remaining Warrant or
Warrants pursuant to the provisions of this Section and of Section 5 hereof.

          The Company shall keep copies of this Agreement and any notices given
or received hereunder available for inspection by the Holders during normal
business hours at its office.

          Section 9. Registration Rights. Upon receipt by the Company of all
necessary third party consents, and in no event later than December 31, 1998,
the Company and Nasdaq shall execute and deliver to each other a Registration
Rights Agreement substantially in the form attached hereto as Exhibit B.

          Section 10. Dissolution, Liquidation or Winding Up. Notwithstanding
any other provision of this Agreement, in the event of any voluntary or
involuntary liquidation, dissolution or winding up of the Company, each
Warrantholder shall be entitled to share, with respect to the Warrant Shares
issuable upon exercise of his Warrants, equally and ratably in any cash or
non-cash distributions payable to holders of Common Stock, less the aggregate
Warrant Exercise Price payable upon the exercise of such Warrants. The Company
shall give notice by first-class mail to each Holder of outstanding Warrants at
such Holder's address as it appears on the Warrant Register at the earliest
practicable time (and, in any event, not less than 20 days before the date on
which such dissolution, liquidation or winding up shall take place). Such notice
shall state that, in connection with such dissolution, liquidation or
winding-up, as the case may be, each Holder of outstanding Warrants shall be
entitled to share equally and ratably in any cash or

                                      -11-

<PAGE>   15

noncash distributions payable to holders of Common Stock. In case of any such
voluntary or involuntary dissolution, liquidation or winding up of the Company,
the Company shall hold in escrow any funds or other property which a Holder is
entitled to receive in respect of such Holder's Warrant Shares at the time of
any distribution made in the case of a voluntary or involuntary dissolution,
liquidation or winding up of the Company. No such Holder will be entitled to
receive payment of any such distribution until such Holder has surrendered the
Warrant Certificates evidencing such Warrant to the Company. From and after such
voluntary or involuntary dissolution, liquidation, or winding-up with respect to
the Company, all rights of the Holders, except the right to receive such
distribution, without interest, upon the surrender of the Warrant Certificates,
shall cease and terminate and such Warrants shall not thereafter be transferred
(except with the consent of the Company) and such Warrants shall not be deemed
to be outstanding for any other purpose whatsoever. For the purposes of this
Agreement, neither the voluntary sale, lease, conveyance, exchange or transfer
(for cash, shares of stock, securities or other consideration) of all or
substantially all the property or assets of the Company, nor the consolidation
or merger of the Company with one or more other Persons, shall be deemed to be a
liquidation, dissolution or winding-up, voluntary or involuntary, with respect
to the Company.

          Section 11. Adjustments to Warrant Exercise Price and Warrant Exercise
Number for Diluting Issues .

          (a) Issue of Securities Deemed Issue of Additional Shares of Common
Stock.

          (1) Options and Convertible Securities. In the event the Company at
any time prior to the Expiration Date shall issue, sell or grant any Additional
Shares of Common Stock in the form of Options or Convertible Securities or shall
fix a record date for the determination of holders of any class of securities
entitled to receive any such Options or Convertible Securities, then, and in
each such case, the maximum number of shares of Common Stock (as set forth in
the instrument relating thereto without regard to any antidilution provisions
contained therein for a subsequent adjustment of such number) issuable upon the
exercise of such Options or, in the case of Convertible Securities, the
conversion or exchange of such Convertible Securities, shall be deemed to be
Additional Shares of Common Stock issued as of the time of such issue, sale or
grant, or in case such a record date shall have been fixed, as of the close of
business on such record date, provided that Additional Shares of Common Stock
shall not be deemed to have been issued for purposes of adjusting the applicable
Warrant Exercise Price unless the consideration per share (determined pursuant
to Section 11(c) hereof) of such Additional Shares of Common Stock would be less
than the Warrant Exercise Price per share on the date of such issue, or such
record date, as the case may be, and provided further that in any such case in
which Additional Shares of Common Stock are deemed to be issued:

          (A) no further adjustment in the Warrant Exercise Price shall be made
upon the subsequent issue of Convertible Securities or Common Stock upon the
exercise of such Options or conversion or exchange of such Convertible
Securities pursuant to the terms in effect at the date of issuance;

          (B) if such Options or Convertible Securities by their terms provide,
with the passage of time or otherwise, for any increase in the consideration
payable to the

                                      -12-

<PAGE>   16

Company, or decrease in the number of shares of Common Stock issuable, upon the
exercise, conversion or exchange thereof, the Warrant Exercise Price computed
upon the original issue thereof (or upon the occurrence of a record date with
respect thereto), and any subsequent adjustments based thereon, shall, upon any
such increase or decrease becoming effective, be recomputed to reflect such
increase or decrease insofar as it affects such Options or the rights of
conversion or exchange under such Convertible Securities which are outstanding
at such time;

          (C) upon the expiration of any such Options or any rights of
conversion or exchange under such Convertible Securities which shall not have
been fully exercised, the Warrant Exercise Price computed upon the original
issue, sale or grant thereof (or upon the occurrence of a record date with
respect thereto), and any subsequent adjustments based thereon, shall, upon such
expiration, be recomputed as if:

          (I) in the case of such Convertible Securities or Options for Common
Stock, the only Additional Shares of Common Stock issued or sold were the shares
of Common Stock, if any, actually issued or sold upon the exercise of such
Options or the conversion or exchange of such Convertible Securities and the
consideration received for such Additional Shares of Common Stock was, in the
case of Options, the consideration actually received by the Company for the
issue, sale or grant of all such Options, whether or not exercised, plus the
consideration actually received by the Company upon such exercise, or, in the
case of Convertible Securities, the consideration actually received by the
Company for the issue, sale or grant of all such Convertible Securities which
were actually converted or exchanged, plus the additional consideration, if any,
actually received by the Company upon such conversion or exchange, and

          (II) in the case of Options for Convertible Securities, only the
Convertible Securities, if any, actually issued or sold upon the exercise
thereof were issued at the time of issue, sale or grant of such Options, and the
consideration received by the Company for the Additional Shares of Common Stock
deemed to have been then issued was the consideration actually received by the
Company for the issue, sale or grant of all such Options, whether or not
exercised, plus the consideration deemed to have been received by the Company
(determined pursuant to Section 11(c)) upon the issue or sale of the Convertible
Securities with respect to which such Options were actually exercised;

          (D) no readjustment pursuant to clause (B) or (C) above shall have the
effect of increasing the Warrant Exercise Price to an amount which exceeds the
lower of (i) the Warrant Exercise Price on the original adjustment date or (ii)
the Warrant Exercise Price that would have resulted from any other issuance of
Additional Shares of Common Stock which would have occurred between the original
adjustment date and such readjustment date;

          (E) in the case of any Options which expire by their terms not more
than 30 days after the date of issue, sale or grant thereof, no adjustment of
the Warrant Exercise Price shall be made until the expiration or exercise of all
such Options, whereupon such adjustment shall be made in the same manner
provided in clause (C) above; and

                                      -13-

<PAGE>   17

          (F) if any such record date shall have been fixed and such Options or
Convertible Securities are not issued on the date fixed therefor, the adjustment
previously made in the Warrant Exercise Price which became effective on such
record date shall be cancelled as of the close of business on such record date,
and thereafter the Warrant Exercise Price shall be adjusted pursuant to
subparagraph 13(a) as of the actual date of their issuance.

          (2) Stock Dividends, Stock Distributions and Subdivision. In the event
the Company at any time prior to the Expiration Date shall declare or pay any
dividend or make any other distribution on the Common Stock payable in shares of
Common Stock, or shall effect a subdivision of the outstanding Common Stock,
into a greater number of shares of Common Stock (by reclassification or
otherwise than by payment of a dividend in shares of Common Stock), then and in
each such event, Additional Shares of Common Stock shall be deemed to have been
issued:

          (A) in the case of any such dividend or distribution, immediately
after the close of business on the record date for the determination of holders
of any class of securities entitled to receive such dividend or distribution, or

          (B) in the case of any such subdivision, at the close of business on
the date immediately prior to the date upon which such corporate action becomes
effective.

          If such record date shall have been fixed and such dividend or
distribution shall not have been paid on the date fixed therefor, the adjustment
previously made in the applicable Warrant Exercise Price which became effective
on such record date shall be cancelled as of the close of business on such
record date, and thereafter the Warrant Exercise Price shall be adjusted
pursuant to subparagraph 15(d) as of the time of actual payment of such dividend
or distribution.

          (b) Adjustment of Warrant Exercise Price Upon Issuance of Additional
Shares of Common Stock. In the event the Company shall issue or be deemed to
issue Additional Shares of Common Stock (excluding Additional Shares of Common
Stock deemed to be issued pursuant to Section 11(a)(2), which event is dealt
with in Section 11(d)) for a consideration per share less than the Warrant
Exercise Price per share for an applicable Warrant, on the date of such issue,
then and in such event, the Warrant Exercise Price for such Warrants shall be
reduced, concurrently with such issue or sale in order to increase the number of
shares of Common Stock into which such Warrants are convertible, to a price
(calculated to the nearest cent) determined by multiplying the Warrant Exercise
Price for the applicable Warrants by a fraction (x) the numerator of which shall
be (1) the number of shares of Common Stock outstanding immediately prior to
such issue or sale, plus (2) the number of shares of Common Stock which the
aggregate consideration received by the Company for the total number of
Additional Shares of Common Stock so issued would purchase at the Warrant
Exercise Price per share on the date of issue, and (y) the denominator of which
shall be (1) the number of shares of Common Stock outstanding immediately prior
to such issue or sale plus (2) the number of such Additional Shares of Common
Stock so issued, provided that for the purposes of this Section 11(b) the number
of shares of Common Stock outstanding at any time shall not include treasury
shares and shall include any Additional Shares of Common Stock deemed to have
been issued

                                      -14-

<PAGE>   18

prior to such time pursuant to this Section 11 and any shares of Common Stock
issuable upon conversion of any outstanding Options and Convertible Securities.

          (c) Determination of Consideration. For purposes of this Section 11,
the consideration received (or deemed to be received) by the Company for the
issue or sale of any Additional Shares of Common Stock (or any Additional Shares
of Common Stock deemed to be issued pursuant to Section 11(a)(1)) shall be
computed as follows:

       (1) Cash and Property: The consideration per share received by the
Company for the issue or sale of Additional Shares of Common Stock shall:

          (A) insofar as it consists of cash, be computed at the aggregate
amount of cash received by the Company excluding amounts paid or payable for
accrued interest or accrued dividends;

          (B) insofar as it consists of property other than cash, be computed
based on its Fair Market Value; and

          (C) in the event Additional Shares of Common Stock are issued together
with other shares or securities or other assets of the Company for consideration
which covers both cash and property other than cash, be the portion of such
consideration so received, computed as provided in clauses (A) and (B) above,
allocable to such Additional Shares of Common Stock as determined in good faith
by the Board of Directors.

       (2) Options and Convertible Securities. The consideration per share
deemed to be received by the Company for Additional Shares of Common Stock
deemed to have been issued pursuant to Section 11(a)(1), relating to Options and
Convertible Securities, shall be determined by dividing

       (x) the total amount, if any, actually received by the Company as
consideration for the issue, sale or grant of such Options or Convertible
Securities, plus the minimum aggregate amount of additional consideration (as
set forth in the instruments relating to such Options or Convertible Securities
without regard to any provision contained therein for a subsequent adjustment of
such consideration) payable to the Company upon the exercise in full of such
Options or the conversion or exchange of such Convertible Securities, or in the
case of Options for Convertible Securities, the exercise of such Options for
Convertible Securities and the conversion or exchange of such Convertible
Securities by

       (y) the maximum number of Additional Shares of Common Stock (as set forth
in the instruments relating to such Options or Convertible Securities, without
regard to any provision contained therein for a subsequent adjustment of such
number) issuable upon the exercise of such Options or the conversion or exchange
of such Convertible Securities.

       (d) Adjustment for Stock Dividends, Distributions, Subdivisions,
Combinations or Consolidation of Common Stock.

                                      -15-

<PAGE>   19

       (1) Stock Dividends, Distributions and Subdivisions. In the event the
Company shall issue Additional Shares of Common Stock pursuant to Section
11(a)(2), relating to stock dividends, distributions and subdivisions, the
Warrant Exercise Price in effect immediately prior to such stock dividend,
distribution or subdivision shall, concurrently with the effectiveness of such
stock dividend, distribution or subdivision, be proportionately decreased to a
price equal to the amount obtained by multiplying the Warrant Exercise Price by
a fraction (i) the numerator of which is the number of shares of Common Stock
outstanding immediately prior to such stock dividend, distribution or
subdivision and (ii) the denominator of which is the number of shares of Common
Stock outstanding immediately after such stock dividend, distribution or
subdivision.

       (2) Combinations or Consolidation of Common Stock. In the event the
outstanding Common Stock shall be combined or consolidated, by reclassification
or otherwise, into a lesser number of shares of Common Stock, the Warrant
Exercise Price in effect immediately prior to such combination or consolidation
shall, concurrently with the effectiveness of such combination or consolidation,
be proportionately increased to a price equal to the amount obtained by
multiplying the Warrant Exercise Price by a fraction (i) the numerator of which
is the number of shares of Common Stock outstanding immediately prior to such
combination or consolidation and (ii) the denominator of which is the number of
shares of Common Stock outstanding immediately after such combination or
consolidation.

       (e) Adjustments for Consolidation, Merger, Sale of Assets,
Reorganization; Etc. In the event the Company (1) shall consolidate with or
merge into any other Company or entity and shall not be the continuing or
surviving Company or entity of such consolidation or merger, or (2) shall permit
any other Company or entity to consolidate with or merge into the Company and
the Company shall be the continuing or surviving Company but, in connection with
such consolidation or merger, the shares of Common Stock shall be changed into
or exchanged for stock or other securities of any other person or cash or any
other property, or (3) shall transfer all or substantially all of its properties
or assets to any other Company or entity, or (4) shall effect a capital
reorganization or reclassification of the Common Stock (other than a change from
par to no-par value stock or from no-par to par value stock, or a capital
reorganization or reclassification resulting in the issue of Additional Shares
of Common Stock for which adjustment in the Warrant Exercise Price is provided
in Section 11(b)), then, and in each such event, proper provision shall be made
so that, upon the basis and the terms and in the manner provided in this Section
11(e), the holder of the Warrants, upon the exercise thereof at any time after
the consummation of such consolidation, merger, transfer, reorganization or
reclassification, shall be entitled to receive, in lieu of the shares of Common
Stock issuable upon such conversion prior to such consummation, the stock and
other securities, cash and property to which such holder would have been
entitled upon such consummation if such holder had converted such Warrants
immediately prior thereto, subject to adjustments (subsequent to such corporate
action) as nearly equivalent as possible to the adjustments provided for in this
Section 11, all as determined in good faith by the Company's Board of Directors
in the reasonable exercise of its discretion. Notwithstanding anything contained
herein to the contrary, the Company will not effect any of the transactions
described in clauses (1) through (4) above unless, prior to the consummation
thereof, each company (other than the Company) which may be required to deliver
any stock, securities, cash or property upon the exercise of Warrants shall

                                      -16-

<PAGE>   20

assume, by written instrument delivered to each Warrantholder, the obligation to
deliver to such holder such shares of stock, securities, cash or property as
such holder may be entitled to receive upon such conversion.

       (f) Distributions of Cash, Debt and Other Assets. In the event that the
Company shall at any time or from time to time distribute to all or
substantially all of the holders of shares of Common Stock (including, without
limitation, any distribution made in connection with a merger or consolidation
in which the Company is the resulting or surviving Person and the Common Stock
is not changed or exchanged) cash, evidences of indebtedness of the Company or
another Person, securities of the Company or another Person or other property or
assets (other than issuances or distributions of securities of the Company
(including, without limitation, shares of Common Stock, Options or Convertible
Securities) pursuant to which the Warrant Exercise Price shall be adjusted
pursuant to another provision of this Section 11) (a "Distribution"), then, and
in each such case, the Warrant Exercise Price then in effect shall be adjusted
(and any other appropriate actions shall be taken by the Company) by multiplying
the Warrant Exercise Price in effect immediately prior to the date of such
distribution by a fraction (A) the numerator of which shall be the Fair Market
Value of the Common Stock less the Fair Market Value of the amount of cash,
evidences of indebtedness, securities or other property or assets so issued or
distributed applicable to one share of Common Stock and (B) the denominator of
which shall be the Fair Market Value of the Common Stock, all as determined on
the record date referred to in the next sentence. Such adjustment shall be made
whenever any distribution is made and shall become effective retroactively to
the date immediately following the close of business on the record date for the
determination of stockholders entitled to receive such distribution.

       (g) Adjustment of Warrant Exercise Number. Upon each adjustment of the
Warrant Exercise Price except as provided in subsection (f) of this Section 11,
the Warrant Exercise Number shall be determined by multiplying the Warrant
Exercise Number immediately prior to such adjustment by a fraction, the
numerator of which shall be the Warrant Exercise Price in effect immediately
prior to such adjustment and the denominator of which shall be the Warrant
Exercise Price as so adjusted.

       Section 12. No Dilution or Impairment. The Company (a) will not permit
the par value of any Warrant Shares issuable upon the exercise of Warrants to
exceed the amount payable therefor upon such exercise, (b) will take all such
action as may be necessary or appropriate in order that the Company may validly
and legally issue fully paid and nonassessable Warrant Shares on the exercise of
the Warrants from time to time outstanding and (c) will not take any action
which results in any adjustment of the Warrant Exercise Number if the total
number of shares of Common Stock (or other securities) issuable after the action
upon the exercise of all of the Warrants would exceed the total number of shares
of Common Stock (or other securities) then authorized by the Company's
Certificate of Incorporation and available for the issuance of shares of Common
Stock (or other securities) upon such exercise.

       Section 13. Payment of Taxes. The Company will pay all documentary stamp
taxes attributable to the initial issuance of Warrant Shares upon the exercise
of Warrants; provided, however, that the Company shall not be required to pay
any tax or taxes which may be payable in respect of any transfer involved in the
issue of any Warrant Certificates or any

                                      -17-

<PAGE>   21

certificates for Warrant Shares in a name other than that of the registered
Holder of a Warrant Certificate surrendered upon the exercise of a Warrant, and
the Company shall not be required to issue or deliver such Warrant Certificates
unless or until the Person or Persons requesting the issuance thereof shall have
paid to the Company the amount of such tax or shall have established to the
satisfaction of the Company that such tax has been paid.

       Section 14. Mutilated or Missing Warrant Certificates. In case any of the
Warrant Certificates shall be mutilated, lost, stolen or destroyed, the Company
may in its discretion issue, in exchange and substitution for and upon
cancellation of the mutilated Warrant Certificate, or in lieu of and
substitution for the Warrant Certificate lost, stolen or destroyed, a new
Warrant Certificate of like tenor and representing an equivalent number of
Warrants, but only upon receipt of evidence reasonably satisfactory to the
Company of such loss, theft or destruction of such Warrant Certificate and
indemnity, if requested, also satisfactory to the Company. Applicants for such
substitute Warrant Certificates shall also comply with such other reasonable
regulations and pay such other reasonable charges as the Company may prescribe.

       Section 15. Reservation of Warrant Shares. The Company will at all times
reserve and keep available, free from preemptive rights, out of the aggregate of
its authorized but unissued Common Stock or its authorized and issued Common
Stock held in its treasury, for the purpose of enabling it to satisfy any
obligation to issue Warrant Shares upon exercise of Warrants, the maximum number
of shares of Common Stock which may then be deliverable upon the exercise of all
Warrants. The Company covenants that all Warrant Shares which may be issued upon
exercise of Warrants will, upon issue, be fully paid, nonassessable, free of
preemptive rights and free from all taxes, liens, charges and security interests
with respect to the issue thereof.

       Section 16. Fractional Interests. The Company shall not be required to
issue fractional Warrant Shares on the exercise of Warrants. If any fraction of
a Warrant Share would, except for the provisions of this Section 16, be issuable
on the exercise of any Warrants (or specified portion thereof), the Company
shall pay an amount in cash equal to the current market price of the Common
Stock on the day immediately preceding the date the Warrant is presented for
exercise, multiplied by such fraction.

       Section 17. Notices to Holders. Upon any adjustment of the Warrant
Exercise Price or the Warrant Exercise Number pursuant to Section 11, the
Company shall promptly thereafter mail to each Holder, at his address appearing
on the Warrant Register written notice of such adjustments by first-class mail,
postage prepaid, a certificate setting forth the Warrant Exercise Price or the
Warrant Exercise Number after such adjustment and setting forth in reasonable
detail the method of calculation and the facts upon which such calculations are
based and setting forth the number of Warrant Shares (or portion thereof)
issuable after such adjustment upon exercise of a Warrant and payment of the
Warrant Exercise Price. Where appropriate, such notice may be given in advance
and included as a part of the notice required to be mailed under the other
provisions of this Section 17.

                                      -18-

<PAGE>   22

       In case:

       (a) the Company shall authorize the issuance to all holders of shares of
Common Stock of rights, options or warrants to subscribe for or purchase shares
of Common Stock or of any other subscription rights or warrants; or

       (b) the Company shall authorize the distribution to all holders of shares
of Common Stock of evidences of its indebtedness or assets (other than cash
dividends or cash distributions payable out of consolidated earnings or earned
surplus or dividends payable in shares of Common Stock or distributions referred
to in subsection (a) of Section 11 hereof); or

       (c) of any consolidation or merger to which the Company is a party and
for which approval of any stockholders of the Company is required, or of the
conveyance or transfer of the properties and assets of the Company substantially
as an entirety, or of any reclassification or change of Common Stock issuable
upon exercise of the Warrants (other than a change in par value, or from par
value to no par value, or from no par value to par value, or as a result of a
subdivision or combination), or a tender offer or exchange offer for shares of
Common Stock; or

       (d) of the voluntary or involuntary dissolution, liquidation or winding
up of the Company; or

       (e) the Company proposes to take any action (other than actions of the
character described in Section 11(a)) which would require an adjustment of the
Warrant Exercise Price or the Warrant Exercise Number pursuant to Section 11; or

       (f) the Company makes any cash dividend (or other dividend to the extent
such dividend is not adjusted for pursuant to Section 11 above) on or
distribution in respect of, its Common Stock;

then the Company shall give to each of the Holders of the Warrant Certificates
at his address appearing on the Warrant Register, at least 20 days (or 10 days
in any case specified in clauses (a) or (b) above) prior to the applicable
record date hereinafter specified, or promptly in the case of events for which
there is no record date, by first-class mail, postage prepaid, a written notice
stating (i) the date as of which the holders of record of shares of Common Stock
to be entitled to receive any such rights, options, warrants or distribution are
to be determined or (ii) the initial expiration date set forth in any tender
offer or exchange offer for shares of Common Stock, and the date as of which it
is expected that holders of record of shares of Common Stock shall be entitled
to exchange such shares for securities or other property, if any, deliverable
upon such reclassification. The failure to give the notice required by this
Section 17 or any defect therein shall not affect the legality or validity of
any distribution, right, option or warrant, or the vote upon any action.

       Nothing contained in this Agreement or in any of the Warrant Certificates
shall be construed as conferring upon the holders thereof the right to vote or
to consent or to receive notice as stockholders in respect of the meetings of
stockholders or the election of Directors of the Company or any other matter, or
any rights whatsoever as stockholders of the Company;

                                      -19-

<PAGE>   23

provided, however, the Company shall deliver to the Holders promptly upon the
sending or filing thereof, copies of all financial statements, reports, notices,
proxy statements and other information sent or made available generally by the
Company to its security holders.

       Section 18. Notices to Company. Any notice or demand authorized by this
Agreement to be given or made by the Holder of any Warrant Certificate to or on
the Company shall be sufficiently given or made when and if deposited in the
mail, first class or registered, postage prepaid, addressed as follows:

       OptiMark Technologies, Inc.
       530 Main Avenue
       Durango, CO  81301
       Attention:  General Counsel
       Telecopy No.: (970) 247-8844

       with a copy to:

       Ducker, Montgomery & Lewis
       1560 Broadway, Suite 1500
       Denver, CO  80202
       Attention: Robert C. Montgomery, Esq.
       Telecopy No.: (303) 861-4017

       If the Company shall fail to maintain such office or agency, the Company
shall give notice of the new office to each Holder.

       Any notice pursuant to this Agreement to be given by the Company to any
Holder(s) of any Warrant Certificate shall be sufficiently given when and if
deposited in the mail, first-class or registered, postage prepaid, addressed to
such Holder at the address given to the Company in a notice from such Holder.

       Section 19. Termination. If the Operating Agreement shall be terminated
in accordance with Section 18 thereof before the Warrant Commencement Date, this
Agreement shall terminate upon the date of termination of the Operating
Agreement. If the Operating Agreement is terminated for any reason on or after
the Warrant Commencement Date, the termination thereof shall have no effect upon
this Agreement with respect to any Warrants issued prior to such termination.

       Section 20. Supplements and Amendments. Any amendment or supplement to
the Warrant Agreement shall require the written consent of registered holders of
a majority of the then outstanding Warrants. Notwithstanding the foregoing, the
consent of each Holder of a warrant affected shall be required for any amendment
pursuant to which (i) the Warrant Exercise Price would be increased or the
Warrant Exercise Number would be decreased (other than pursuant to adjustments
provided here) or (ii) the Triggering Events (or rights or obligations upon the
occurrence of any such Triggering Events) are changed in a manner adverse to any
Warrantholder.

                                      -20-

<PAGE>   24

       Section 21. Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company and the Warrantholders shall bind
and inure to the benefit of their respective successors and assigns hereunder.

       Section 22. Governing Law. This Agreement and each Warrant Certificate
issued hereunder shall be deemed to be a contract made under the laws of the
State of New York and for all purposes shall be construed in accordance with the
internal laws of said State.

       Section 23. Benefits of This Agreement. Nothing in this Agreement shall
be construed to give to any person or corporation other than the Company and the
Holders of the Warrant Certificates any legal or equitable right, remedy or
claim under this Agreement; but this Agreement shall be for the sole and
exclusive benefit of the Company and the Holders of the Warrant Certificates.

       Section 24. Counterparts. This Agreement may be executed in any number of
counterparts and each of such counterparts shall for all purposes be deemed to
be an original, and all such counterparts shall together constitute but one and
the same instrument.

       [Signature Page Follows]

<PAGE>   25

SIGNATURES

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed, as of the day and year first above written.

                                   OPTIMARK TECHNOLOGIES, INC.

                                   By:  /s/   William A. Lupien
                                        Chairman & CEO

                                   THE NASDAQ STOCK MARKET, INC.

                                   By:  /s/   J. Patrick Campbell
                                        Chief Operating Officer

<PAGE>   26
                                                                       Exhibit A

                           FORM OF WARRANT CERTIFICATE

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED. THIS WARRANT MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH
REGISTRATION OR AN EXEMPTION THEREFROM UNDER SUCH ACT. THIS WARRANT MAY BE
TRANSFERRED ONLY IN COMPLIANCE WITH THE CONDITIONS SPECIFIED IN THE WARRANT
AGREEMENT.

                           OPTIMARK TECHNOLOGIES, INC.

                Warrants to Purchase Common Stock $0.01 par value
                         of OPTIMARK TECHNOLOGIES, INC.

No.___________                                           ________ Warrants

          This Warrant Certificate certifies that _________ or registered
assigns is the registered owner of _________ Warrants, each Warrant entitling
such owner to purchase initially one share of Common Stock, $0.01 par value
("Common Stock") of OptiMark Technologies, Inc. (the "Company") at the price of
$______ per share (the "Warrant Exercise Price"), subject to the terms and
conditions hereof and of the Warrant Agreement hereinafter referred to. The
holder ("Holder") may exercise the Warrants evidenced hereby by (i) providing
certain information set forth on the back hereof, (ii) paying in full, in lawful
money of the United States of America in cash, by certified check or official
bank check, by bank wire transfer, or any combination of the foregoing, the
Warrant Exercise Price for each Warrant exercised (the "Aggregate Exercise
Price") to the Company (as hereinafter defined) and (iii) surrendering this
Warrant Certificate to the Company, with the exercise form on the back hereof
duly executed. Alternatively, if at any time when a Warrant is exercisable, the
Fair Market Value of one share of Common Stock is greater than the Warrant
Exercise Price of the applicable Warrant, in lieu of exercising such Warrant for
cash, a Holder may exercise such Warrant by delivering a notice (a "Cashless
Exercise Notice") to the Company of a cashless exercise. Upon delivery to the
Company of a Cashless Exercise Notice, together with surrender of the applicable
Warrant, the Holder shall receive from the Company Warrant Shares equal to

          A x (Fair Market Value - Warrant Exercise Price)/Fair Market Value

where A = the number of Warrant Shares as to which such Warrant is being
exercised pursuant to a cashless exercise.

          The "Fair Market Value" per share of Common Stock shall mean the price
which could be negotiated in an arm's length, free market transaction, for cash,
between a willing seller and a willing buyer, neither of whom is under any
pressure or compulsion to complete the transaction, in each case as determined
reasonably and in good faith by the Board of Directors; provided that if shares
of Common Stock are traded or quoted, as the case may be (x) on the

<PAGE>   27
                                                                       Exhibit A
                                                                          Page 2

National Association of Securities Dealers' Automated Quotation System
("NASDAQ") National Market System, (y) in the over-the-counter market or (z) on
a National Securities Exchange, the "Fair Market Value" per share of Common
Stock at any date shall be deemed to be the average daily Closing Prices of the
shares of Common Stock for the 15 consecutive trading days commencing 20 trading
days before the day in question. As used in herein, the term "Closing Price" of
the shares of Common Stock for a day or days shall mean (a) if the shares of
Common Stock are not listed or admitted for trading on a National Securities
Exchange, (i) the last transaction price of the shares of Common Stock on the
NASDAQ National Market System or, in the case no such reported transaction takes
place on such day or days, the average of the reported closing bid and asked
prices thereof quoted on the NASDAQ National Market System, or (ii) if the
shares of Common Stock are not quoted on the NASDAQ National Market System, the
average of the closing bid and asked prices of the shares of Common Stock in the
over-the-counter market, as reported by the National Quotation Bureau, Inc., or
an equivalent generally accepted reporting service or (b) if the shares of
Common Stock are listed or admitted for trading on a National Securities
Exchange, the last reported sales price regular way, or in case no such reported
sale takes place on such day or days, the average of the reported closing bid
and asked prices regular way, in either case on the principal National
Securities Exchange on which the shares of Common Stock are listed or admitted
for trading.

          IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to
be duly executed.

                                             OPTIMARK TECHNOLOGIES, INC.

                                             By____________________________

<PAGE>   28
                                                                       Exhibit A
                                                                          Page 3

                     FORM OF REVERSE OF WARRANT CERTIFICATE

          This Warrant is issued under a Warrant Agreement, dated September 1,
1998, (the "Warrant Agreement") between the Company and Holder and is subject to
the terms and provisions contained in the Warrant Agreement, which are
incorporated by reference in and made a part of this Warrant Certificate, to all
of which terms and provisions the Holder of this Warrant Certificate consents by
acceptance hereof. Copies of the Warrant Agreement are available at the
above-mentioned office of the Company. All capitalized terms not otherwise
defined herein shall have the meaning assigned such term in the Warrant
Agreement.

                      Instructions for Exercise of Warrant

          To exercise the Warrants evidenced hereby, the holder must pay the
Warrant Exercise Price in full in a manner provided for in the Warrant
Certificate for the Warrants exercised to OptiMark Technologies, Inc.,
________________________, Attention: General Counsel, which payment must specify
the name of the holder and the number of Warrants exercised by such holder. In
addition, the holder must complete the information required below and present
this Warrant Certificate in person or by mail (certified or registered mail,
return receipt requested, is recommended) to the Company at the appropriate
address set forth below. This Warrant Certificate, completed and duly executed,
must be received by the Company within five Business Days of the payment.

                     To be Executed Upon Exercise of Warrant

          The undersigned hereby irrevocably elects to exercise _______
Warrants, evidenced by this Warrant Certificate, to purchase ________________
shares of Common Stock, $0.01 par value of OptiMark Technologies, Inc. or its
successor and represents that he has made payment of the Warrant Exercise Price
in a manner provided for in the Warrant Certificate for such Warrant Shares to
OptiMark Technologies, Inc., ________________________, Attention: General
Counsel, in accordance with the terms hereof. The undersigned requests that said
shares of Common Stock or other securities constituting consideration be in
fully registered form registered in such names and delivered all as specified in
accordance with the instructions set forth below.

          If the number of Warrants exercised is less than all of the Warrants
evidenced hereby, the undersigned requests that a new Warrant Certificate
representing the remaining Warrants evidenced hereby be issued and delivered to
the undersigned unless otherwise specified in the instructions below.

Dated:                              Name
       ---------------                  -------------------------
                                             (Please Print)

<PAGE>   29
                                                                       Exhibit A
                                                                          Page 4

(Insert Social Security
or Other Identifying                            Address
Number of Holder)                                      ---------------------
                                                       ---------------------
                                                       ---------------------
                                                             Signature

Signature Guaranteed      (Signature must conform in all respects to name of
                          Holder specified on the face of this Warrant
                          Certificate and must bear a signature guarantee by a
                          bank, trust company or member firm of a national
                          securities exchange.)

          The Warrants evidenced hereby may be exercised at the following
addresses:

          By hand at
                           -------------------------------------------
                           -------------------------------------------
                           -------------------------------------------
                           -------------------------------------------

          By mail at
                           -------------------------------------------
                           -------------------------------------------
                           -------------------------------------------
                           -------------------------------------------

          Instructions as to form and delivery of Common Stock and, if
applicable, Warrant Certificates evidencing unexercised Warrants:

<PAGE>   30
                                                                       Exhibit A
                                                                          Page 5

Assignment

          (Form of Assignment To Be Executed If Holder Desires To Transfer
Warrants Evidenced Hereby)

          FOR VALUE RECEIVED _____________________ hereby sells, assigns and
transfers unto

                                            Please insert social security
                                            or other identifying number

-------------------------------
(Please print name and address
including zip code)

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

the Warrants represented by the within Warrant Certificate and does hereby
irrevocably constitute and appoint ________________ Attorney, to transfer said
Warrant Certificate on the books of the Company with full power of substitution
in the premises.

Dated:

                                          -----------------------------
                                                    Signature

Signature Guaranteed    (Signature must conform in all respects to name of
                        Holder specified on the face of this Warrant Certificate
                        and must bear a signature guarantee by a bank, trust
                        company or member firm of a national securities
                        exchange.)

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