Document:

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                                                                    EXHIBIT 10.3

                             PSE-OPTIMARK AGREEMENT

       This PSE-OptiMark Agreement ("this Agreement") is entered into effective
as of the 27th day of August, 1996 by and between The Pacific Stock Exchange
Incorporated, a Delaware corporation ("PSE"), and OptiMark Technologies, Inc., a
Delaware corporation (the "Company").

                                  - Recitals -

       A.     The Company owns and has applied for patents on certain market
structuring technology referred to by the Company as "OptiMark(TM)". PSE has
become generally familiar with the potential capabilities of OptiMark(TM). The
Company desires to present OptiMark(TM) for trading equities and equity options
to the investment community as a facility of a securities exchange or otherwise.
PSE desires to make OptiMark(TM) available to the financial community in
connection with trading on the Pacific Exchange, in the manner and subject to
the terms and conditions stated below.

       B.     Effective simultaneously with the execution and delivery of this
Agreement, pursuant to a Stock Purchase Agreement of even date among the Company
and certain investors designated therein (the "Stock Purchase Agreement"), the
Company is closing the first stage ($4.8 million) of a total $16 million
offering of the Company's Series A Convertible Participating Preferred Stock.

       NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

       1.     DEFINITIONS. For purposes of this Agreement, in addition to other
terms defined elsewhere herein, the following terms shall have the indicated
meanings.

              (a)    "1934 Act" means the Securities Exchange Act of 1934, as
amended, and all applicable rules and regulations thereunder.

              (b)    "Affiliates" of a party means that party's officers,
directors, employees, and any corporations or other entities that control, are
controlled by, or are under common control with that party.

              (c)    "Exchange Warrants" means PSE's rights to acquire Exchange
Listed Equities Warrant Shares, Exchange Listed Options Warrant Shares, Exchange
UTP Warrant Shares, and Exchange After-Hours Warrant Shares, all as described in
the Purchase Warrant.

              (d)    "OptiMark-Securities" refers to the service described
generally in Exhibit B attached hereto, as it exists on the date hereof and as
it may be modified from time to time hereafter.

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              (e)    "Other Exchange Applications" means the Availability of
OptiMark-Securities through one or more Other Exchanges for (i) equity
securities listed on such Other Exchange(s) during normal trading hours, (ii)
equity securities pursuant to unlisted trading privileges on such Other
Exchange(s), if any, (iii) options during normal trading hours, if any, and (iv)
equity securities after-hours, if applicable.

              (f)    "Other Exchanges" means (i) securities exchanges registered
under Section 6 of the 1934 Act, other than the Pacific Exchange, including
without limitation the New York, American, Boston, Chicago, Cincinnati and
Philadelphia Stock Exchanges, and the Chicago Board Options Exchange, and (ii)
securities exchanges licensed, registered or otherwise authorized to do business
as such under the laws of any country other than the United States.

              (g)    "Pacific Exchange" means the securities exchange operated
by PSE, registered under Section 6 of the 1934 Act.

              (h)    "PSE Applications" means the Availability of
OptiMark-Securities through the Pacific Exchange for (i) equity securities
listed on the Pacific Exchange during normal trading hours (i.e., the PSE Listed
Application), (ii) equity securities pursuant to Pacific Exchange Unlisted
Trading Privileges (UTP), (iii) options during normal trading hours, and (iv)
equity securities after-hours.

              (i)    "PSE Listed Application" means the Availability of
OptiMark-Securities through the Pacific Exchange for equity securities listed on
the Pacific Exchange during normal trading hours.

              (j)    "PSE Warrants" means PSE's rights to acquire PSE Listed
Equities Warrant Shares, PSE Listed Options Warrant Shares, PSE UTP Warrant
Shares, and PSE After-Hours Warrant Shares, all as described in the Purchase
Warrant.

              (k)    "Purchase Warrant" means the Common Stock Purchase Warrant
of even date issued by the Company to PSE.

              (l)    "Regulatory Approval" means grant of all Rule Changes by
the staff of or the SEC.

              (m)    "Rule Changes" means all rule changes, no action letters,
exemptions and/or waivers necessary under the 1934 Act, if any, to allow PSE
Applications.

              (n)    "SEC" means the U.S. Securities and Exchange Commission.

              (o)    "Users" means the Pacific Exchange's members and other
brokers, dealers and investors who wish to utilize OptiMark-Securities.

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              (p)    As used herein, phrases such as "Availability", "made
Available", "make Available through" or "making Available" as applied to
OptiMark-Securities and the relevant PSE Applications mean that, on or after the
Initial Operational Capability Date (as defined in Section 5(c) below), the PSE
Interfaces (as defined in Section 4(a) below) permit the necessary
communications between OptiMark-Securities and the relevant systems of the
Pacific Exchange described in Section 4(a) such that Users have the ability to
utilize OptiMark-Securities subject to entering into a User Agreement (as
defined in Section 11 below) with the Company or its Affiliates. Notwithstanding
the use of such phrases in the Agreement, PSE is not providing, or offering to
provide, OptiMark-Securities to Users, either directly or indirectly.

       2.     OPTIMARK DEVELOPMENT. The Company promptly shall commence and
diligently shall pursue, using commercially reasonable efforts, the development,
refinement and implementation of OptiMark-Securities for PSE Applications. The
Company initially shall focus principally on development, refinement and
implementation of OptiMark-Securities for the PSE Listed Application. The
Company expects to develop OptiMark-Securities for the PSE Listed Application in
the following stages:

<TABLE>
<CAPTION>
==============================================================================================================================
                                                                                     Estimated
                                 Stage                                               Schedule
                                 -----                                               --------
------------------------------------------------------------------------------------------------------------------------------
<S>                                                                               <C>
Requirements analysis                                                             1/15/96 - 8/6/96
------------------------------------------------------------------------------------------------------------------------------
Detailed hardware design                                                          8/7/96 - 10/1/96
------------------------------------------------------------------------------------------------------------------------------
Detailed software design                                                          8/7/96 - 10/29/96
------------------------------------------------------------------------------------------------------------------------------
Engineering development                                                           8/7/96 - 10/17/97
------------------------------------------------------------------------------------------------------------------------------
Coding and unit testing                                                           8/23/96 - 3/20/97
------------------------------------------------------------------------------------------------------------------------------
System integration and testing                                                    1/27/97 - 8/22/97
------------------------------------------------------------------------------------------------------------------------------
System installation                                                               8/25/97 - 9/19/97
------------------------------------------------------------------------------------------------------------------------------
Formal acceptance test report                                                          8/22/97
------------------------------------------------------------------------------------------------------------------------------
Operational testing                                                              9/22/97 - 10/17/97
------------------------------------------------------------------------------------------------------------------------------
System operational (PSE Listed Application)                                           10/17/97
==============================================================================================================================
</TABLE>

       3.     RULE CHANGES. The Company shall cause its counsel promptly to
commence, diligently to pursue and as soon as practicable to deliver to PSE (a)
a detailed written analysis as to whether, in the Company's view, any Rule
Changes are necessary and, if so (b) a proposed formal written request for such
Rule Changes for presentation by PSE to the SEC, with all supporting documents
that the Company believes are required (a "Rule Filing"). PSE and its counsel
shall review the Company's analysis and Rule Filing, shall determine
independently whether, in PSE's view, any Rule Changes are necessary and, if so,
shall finalize the Rule Filing in consultation with the Company. The Company
promptly shall deliver to PSE any supplemental information and supporting
documentation reasonably requested by PSE in this respect. The form and
substance of any Rule Filing shall be determined by PSE and shall be subject to
the Company's reasonable approval, not to be unreasonably withheld or delayed.
If PSE determines that a Rule Filing is required, PSE shall submit the Rule
Filing to the SEC as soon as practicable. PSE thereafter diligently shall pursue
Regulatory Approval, using

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commercially reasonable efforts, including to the extent necessary or
appropriate (i) attending public hearings and meetings with the SEC, in
Washington, D.C. and elsewhere, and (ii) responding to requests by the SEC and
comment letters to or from the SEC, in consultation with the Company.

       4.     INTERFACE DEVELOPMENT.

              (a)    As soon as practicable, the Company shall deliver to PSE
detailed specifications for the hardware and software needed to allow
OptiMark-Securities to interface with PSE's computerized order book, including
the terminals in use by Users, the Intermarket Trading System (ITS),
Consolidated Quote System (CQS), Consolidated Tape System (CTS), and PCOAST (fka
Scorex) system (generally, "PSE Interfaces"). All of such specifications for PSE
Interfaces shall be subject to PSE's approval, not to be unreasonably withheld
or delayed. The date on which PSE gives such approval (if any) is referred to
below as the "Interface Specifications Approval Date".

              (b)    For purposes of this Agreement, the "Interface Development
Commencement Date" means the latest to occur of the following:

                     (i)    the Interface Specifications Approval Date;

                     (ii)   the "Second Closing" under and pursuant to the Stock
       Purchase Agreement;

                     (iii)  the submission of the Rule Filing to the SEC by PSE,
       if Rule Changes are deemed necessary in accordance with Section 3 ("Rule
       Changes") above; and

                     (iv)   execution and delivery by the Company, PSE and
       International Business Machines Corporation ("IBM") of a contract,
       satisfactory to PSE and the Company in their discretion (an "IBM
       Contract"), under which IBM will provide technical assistance to PSE in
       connection with design, development and testing of the PSE Interfaces.

              (c)    Promptly following the Interface Development Commencement
Date, PSE shall commence and diligently shall pursue, using commercially
reasonable efforts, the design, development and testing of the PSE Interfaces.
PSE initially shall focus principally on development of PSE Interfaces for the
PSE Listed Application.

              (d)    The Company shall pay to IBM under the IBM Contract such
amounts as may reasonably be necessary to assist PSE in the design, development
and testing of the PSE Interfaces, not to exceed $1,000,000.

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       5.     KEY DATES.

              (a)    The date (if any) on which OptiMark-Securities for the PSE
Listed Application is complete and operational in all material respects and
ready for system integration and testing, subject only to readiness of the
related PSE Interfaces, is referred to below as the "Software Completion Date".

              (b)    The date (if any) on which all PSE Interfaces needed for
the PSE Listed Application are complete and operational in all material respects
and ready for system integration and testing, subject only to readiness of
OptiMark-Securities, is referred to below as the "Interface Completion Date".

              (c)    The date (if any) on which both (i) OptiMark-Securities and
all related PSE Interfaces needed for the PSE Listed Application have been fully
tested and are ready for actual Availability on the Pacific Exchange, subject
only to PSE making OptiMark-Securities Available, and (ii) Regulatory Approval
has been obtained or has been deemed unnecessary by both parties, is referred to
below as the "Initial Operational Capability Date".

       6.     COOPERATION; PROGRESS REPORTS; MEETINGS.

              (a)    The Company shall provide all cooperation and assistance as
PSE reasonably may request from time to time in connection with PSE's
development and implementation of the PSE Interfaces under this Agreement. PSE
shall provide all cooperation and assistance related to PSE Interfaces as the
Company reasonably may request from time to time in connection with the
Company's development and implementation of OptiMark-Securities for PSE
Applications under this Agreement.

              (b)    PSE and the Company shall participate in a monthly
conference call during which each shall report to the other as to the status and
prospects of the project contemplated by this Agreement.

              (c)    At such times as PSE reasonably may request, the Company
shall provide to PSE a written report in reasonable detail as to the status of
the development of OptiMark-Securities under this Agreement, including any known
or anticipated potential problems (whether or not resolved or resolvable) and a
comparison of the Company's progress against the schedule set forth in Section 2
("OptiMark Development") above. At such times as the Company reasonably may
request, PSE shall provide to the Company a written report in reasonable detail
as to the status of the development of the PSE Interfaces for the PSE Listed
Application and other PSE Applications, including any known or anticipated
potential problems (whether or not resolved or resolvable).

              (d)    Once each calendar quarter, in San Francisco,
representatives of PSE and the Company shall meet for a formal mutual status
presentation and discussion concerning the development of OptiMark-Securities
and related PSE Interfaces.

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              (e)    From time to time upon reasonable prior notice from the
other party, each party shall allow the other party access to its premises for
purposes of design review, "walk-throughs", and discussions between the parties'
management and line personnel concerning the status and conduct of work being
performed under this Agreement.

       7.     INDUSTRY PROMOTION.

              (a)    As soon as practicable following the date of this
Agreement, the Company shall prepare and submit to PSE a proposed, detailed
written marketing plan for promoting OptiMark-Securities as a facility of the
Pacific Exchange. PSE and the Company shall attempt to finalize the marketing
plan as soon as practicable thereafter.

              (b)    Following agreement between the parties as to the final,
detailed marketing plan, if any (the agreed version is referred to below as the
"Marketing Plan"), upon the reasonable request of the Company from time to time,
PSE shall, to the extent specified in the Marketing Plan (i) promote
OptiMark-Securities to Other Exchanges, (ii) co-sponsor with the Company a
series of seminars in major U.S. financial centers promoting OptiMark-Securities
to institutional money managers, and (iii) generally assist the Company in
promoting OptiMark-Securities to the financial community in the U.S. and abroad.
The Company shall pay all of PSE's out-of-pocket expenses in connection with any
promotion abroad of OptiMark-Securities.

              (c)    PSE's obligations under this Section 7 shall be suspended
for such time(s), if any, as (i) the Company is more than three months behind on
the development schedule for OptiMark-Securities set forth in Section 2
("OptiMark Development") above, (ii) the SEC indicates that Regulatory Approval
is unlikely, or (iii) the parties are in disagreement as to whether a Rule
Filing is necessary.

       8.     BURDEN ON PSE. Notwithstanding anything to the contrary set forth
elsewhere herein, the obligations of PSE under this Agreement (a) shall not
require any disruption whatsoever to trading activities on the Pacific Exchange,
and (b) shall not unreasonably interfere with the normal duties of PSE and its
staff.

       9.     FORCE MAJEURE. Each party shall be excused from delays in
performing or failure to perform under this Agreement if and to the extent that
such delays or failures result from causes beyond the reasonable control of such
party, including without limitation fire, flood, epidemic, earthquake,
explosion, accident, riot, war, civil disturbance, labor dispute, strike or any
Act of God (generally, "Force Majeure"); provided that, in order to be excused
from delay or failure to perform, the affected party must (i) promptly notify
and keep the other party appropriately informed of the claim of Force Majeure,
and (ii) diligently use commercially reasonable efforts to eliminate the Force
Majeure. Each deadline set forth in this Agreement (including without limitation
the deadlines set forth in Section 10 ("Termination") below) shall be
appropriately extended, day-for-day, in the event of a Force Majeure.

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       10.    TERMINATION.

              (a)    For purposes of this Section 10, "Termination" of this
Agreement means termination of the parties' obligations under Section 2
("OptiMark Development"), Section 3 ("Rule Changes"), Section 4 ("Interface
Development"), Section 6 ("Cooperation; Progress Reports; Meetings") and Section
7 ("Industry Promotion") above and Section 13 ("Publicity") below. Except as
otherwise provided below, Termination shall be effective upon written notice to
the other party, which notice shall cite the paragraph of this Section 10 under
which Termination is being effected and specify the reasons for Termination in
reasonable detail. Except as otherwise provided below, Section 12 ("Ownership;
License"), Section 14 ("Confidentiality") and Section 17 ("Breach;
Indemnification; Remedies") shall survive any Termination of this Agreement.

              (b)    If the Company has not delivered to PSE a proposed Rule
Filing (if necessary) within 60 days following the date of this Agreement or
fails to deliver additional information for the Rule Filing within 30 days of a
reasonable request therefor by PSE, PSE may Terminate this Agreement at any time
thereafter; provided that PSE may not Terminate this Agreement under this
paragraph (b) following the Company's delivery of the proposed Rule Filing or
the referenced requested information to PSE. In connection with any Termination
of this Agreement under this paragraph (b), (i) the Purchase Warrant shall
remain outstanding in its entirety, and (ii) the Paragraph 13(c) License (as
defined below) shall be cancelled automatically.

              (c)    If the Company notifies PSE that the Company has determined
in good faith that a Rule Filing is necessary (such notice to specify in detail
the exact Rule Changes that are necessary) but PSE disagrees in writing, and the
parties fail to resolve the dispute (despite good faith efforts) on or before
January 31, 1997, the Company may Terminate this Agreement at any time
thereafter. In connection with any Termination of this Agreement under this
paragraph (c), (i) the Exchange Warrants shall remain outstanding and (ii) the
PSE Warrants and the Paragraph 13(c) License shall be cancelled automatically.

              (d)    If the Company notifies PSE that the Company has determined
in good faith that a Rule Filing is not necessary but PSE disagrees in writing,
PSE may Terminate this Agreement at any time thereafter. In connection with any
Termination of this Agreement under this paragraph (d), (i) the PSE Warrants
shall be cancelled, (ii) the Exchange Warrants shall remain outstanding, and
(iii) the Paragraph 13(c) License shall remain in effect if (but only if) the
Company has expended at least $500,000 under the IBM Contract pursuant to
Section 4(d) above; otherwise, the Paragraph 13(c) License shall be cancelled
automatically.

              (e)    For purposes of this paragraph (e), the "Next PSE Board
Meeting" means the next regularly scheduled meeting of the full board of
directors of PSE (the "PSE Board"), which meeting is at least 45 days beyond the
date that the Company delivers its proposed Rule Filing to PSE. If the Company
and PSE have agreed that Rule Changes are necessary and at the Next PSE Board
Meeting (i) the PSE Board does not

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consider or disapproves the Rule Filing, (ii) the PSE Board refuses to allow PSE
to make a Rule Filing, or (iii) the PSE Board approves or conditionally approves
the Rule Filing and the making of a Rule Filing, and in any such case PSE does
not submit a Rule Filing to the SEC within 30 days following the Next PSE Board
Meeting, then the Company may Terminate this Agreement at any time thereafter;
provided that the Company may not Terminate this Agreement under this paragraph
(e) following submission of the Rule Filing to the SEC by PSE; and provided
further, however, in the case of clause (e)(iii) above, if the Board seeks
additional information from the Company, the Company may not Terminate this
Agreement unless PSE has not submitted the Rule Filing to the SEC within 45 days
following the date on which the Company has complied with such request for
additional information in all material respects. In connection with any
Termination of this Agreement under this paragraph (e), the Purchase Warrant and
the Paragraph 13(c) License shall be cancelled automatically.

              (f)    If Regulatory Approval is denied, or if Regulatory Approval
has not been received within twelve months following submission of the Rule
Filing to the SEC by PSE, either party may Terminate this Agreement at any time
thereafter. In connection with any Termination of this Agreement under this
paragraph (f), (i) the Purchase Warrant shall remain outstanding in its
entirety, and (ii) the Paragraph 13(c) License shall remain in effect if (but
only if) the Company has expended at least $500,000 under the IBM Contract
pursuant to Section 4(d) above; otherwise, the Paragraph 13(c) License shall be
cancelled automatically.

              (g)    If the Software Completion Date has not occurred by March
31, 1998, PSE may Terminate this Agreement at any time thereafter; provided,
however, that PSE may not Terminate this Agreement under this paragraph (g)
following the Software Completion Date. In connection with any Termination of
this Agreement under this paragraph (g), (i) the PSE Warrants shall be
cancelled, (ii) the Exchange Warrants shall remain outstanding, and (iii) the
Paragraph 13(c) License shall remain in effect if (but only if) the Company has
expended at least $500,000 under the IBM Contract pursuant to Section 4(d)
above; otherwise, the Paragraph 13(c) License shall be cancelled automatically.

              (h)    If the Interface Completion Date has not occurred by the
later of (i) eight months following the Interface Development Commencement Date,
or (ii) thirty days following the Software Completion Date, the Company may
Terminate this Agreement at any time thereafter; provided, however, that the
Company may not Terminate this Agreement under this paragraph (h) following the
Interface Completion Date. In connection with any Termination of this Agreement
under this paragraph (h), (x) the PSE Warrants shall be cancelled, (y) the
Exchange Warrants shall remain outstanding, and (z) the Paragraph 13(c) License
shall remain in effect if (but only if) the Company has expended at least
$500,000 under the IBM Contract pursuant to Section 4(d) above; otherwise, the
Paragraph 13(c) License shall be cancelled automatically.

              (i)    If within 30 days following the Initial Operational
Capability Date PSE has not made OptiMark-Securities Available with respect to
at least fifty percent (50%) of the total number of issues of listed equity
securities traded on the Pacific

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Exchange during normal business hours, the Company may Terminate this Agreement
at any time thereafter; provided, however, that the Company may not Terminate
this Agreement under this paragraph (i) following the date (if any) on which PSE
actually makes OptiMark-Securities Available to Users for the PSE Listed
Application. In connection with any Termination of this Agreement under this
paragraph (i), (i) the PSE Warrants shall be cancelled, (ii) the Exchange
Warrants shall remain outstanding, and (iii) the Paragraph 13(c) License shall
remain in effect if (but only if) the Company has expended at least $500,000
under the IBM Contract pursuant to Section 4(d) above; otherwise, the Paragraph
13(c) License shall be cancelled automatically.

              (j)    If PSE fails to satisfy in all material respects the
specific objective obligations of PSE as stated in the Marketing Plan, if any,
after written notice from the Company and a reasonable opportunity to cure, the
Company may Terminate this Agreement at any time thereafter. In connection with
any Termination of this Agreement under this paragraph (j), (i) the PSE Warrants
shall be cancelled, (ii) the Exchange Warrants shall remain outstanding, and
(iii) the Paragraph 13(c) License shall remain in effect if (but only if) the
Company has expended at least $500,000 under the IBM Contract pursuant to
Section 4(d) above; otherwise, the Paragraph 13(c) License shall be cancelled
automatically.

              (k)    In the event any Force Majeure precludes or materially
impairs the Company's ability to perform under this Agreement for a period of
120 consecutive days or more, PSE shall have the right to Terminate this
Agreement at any time thereafter; provided that PSE may not Terminate this
Agreement under this paragraph (k) following elimination of the Force Majeure.
In connection with any Termination of this Agreement under this paragraph (k),
(i) the PSE Warrants shall be cancelled, (ii) the Exchange Warrants shall remain
outstanding, and (iii) the Paragraph 13(c) License shall remain in effect if
(but only if) the Company has expended at least $500,000 under the IBM Contract
pursuant to Section 4(d) above; otherwise, the Paragraph 13(c) License shall be
cancelled automatically.

              (l)    In the event any Force Majeure precludes or materially
impairs PSE's ability to perform under this Agreement for a period of 120
consecutive days or more, the Company shall have the right to Terminate this
Agreement at any time thereafter; provided that the Company may not Terminate
this Agreement under this paragraph (l) following elimination of the Force
Majeure. In connection with any Termination of this Agreement under this
paragraph (l), (i) the PSE Warrants shall be cancelled, (ii) the Exchange
Warrants shall remain outstanding, and (iii) the Paragraph 13(c) License shall
remain in effect if (but only if) the Company has expended at least $500,000
under the IBM Contract pursuant to Section 4(d) above; otherwise, the Paragraph
13(c) License shall be cancelled automatically.

              (m)    If the Company has not closed the second stage ($11.2
million) of its total $16 million offering under the Stock Purchase Agreement by
January 31, 1997, PSE may Terminate this Agreement at any time thereafter;
provided, however, that PSE may not Terminate this Agreement under this
paragraph (m) following the date (if any) on which the Company completes the
second stage of its offering under the Stock Purchase Agreement. In connection
with any Termination of this Agreement under this

<PAGE>   10

paragraph (m), (i) the Purchase Warrant shall remain outstanding in its
entirety, and (ii) the Paragraph 13(c) License shall be cancelled automatically.

       11.    USER AGREEMENTS. Upon the implementation of OptiMark-Securities
for PSE Applications, there will be one or more written agreements with each
User ("User Agreements"). Each User Agreement shall include (a) an appropriate
limited right for the User to access OptiMark-Securities, (b) limited liability
of the Company and its Affiliates, and limited remedies of Users against the
Company and its Affiliates, (c) an exculpation of PSE and its Affiliates in form
and substance satisfactory to PSE, and (d) other terms and conditions deemed to
be necessary by the Company or its Affiliates in connection with effectuating
the foregoing from time to time. Each User shall pay fees for use of
OptiMark-Securities, which fees the Company may change from time to time (the
"Fee Schedule"). Under the Fee Schedule, PSE specialists shall be entitled to
certain fee exceptions as set forth on Exhibit A to this Agreement. If the
Company or its Affiliates ever offers to the specialists of one or more Other
Exchanges a more favorable fee structure for OptiMark-Securities than set forth
on Exhibit A, the Company or its Affiliates simultaneously shall offer the more
favorable fee structure to PSE's specialists.

       12.    PUBLICITY. Any press release or other publicity by the Company
describing this Agreement or otherwise referencing PSE that occurs prior to
agreement on the Marketing Plan or that is not entirely consistent with the
Marketing Plan shall be subject to prior written approval by PSE, not to be
unreasonably withheld or delayed.

       13.    OWNERSHIP; LICENSE.

              (a)    Nothing in this Agreement grants to PSE any ownership,
license or other proprietary or property rights in OptiMark(TM) or
OptiMark-Securities or in any intellectual property rights therein. PSE shall
assign to the Company all of PSE's ownership, intellectual property and other
proprietary or property rights in any system, method, apparatus or work of
authorship hereafter developed or created in whole or in part by PSE relating
principally to or used principally in OptiMark(TM) or OptiMark-Securities or any
copy or embodiment thereof.

              (b)    Subject to the Paragraph 13(c) License, nothing in this
Agreement grants to the Company any ownership, license or other proprietary or
property rights in the PSE Interfaces or in any intellectual property rights
therein. The Company and its Affiliates shall assign to PSE all of the
ownership, intellectual property and other proprietary or property rights of the
Company and its Affiliates in any system, method, apparatus or work of
authorship hereafter developed or created in whole or in part by the Company
relating principally to or used principally in the PSE Interfaces or any copy or
embodiment thereof.

              (c)    PSE hereby grants to the Company a perpetual fully-paid,
nonexclusive, nontransferable (except in accordance with this Agreement) right
and license to use and modify the PSE Interfaces, in whatever stage of
completion they may exist from time to time, in connection with (and only in
connection with) any use of

<PAGE>   11

OptiMark(TM) and/or OptiMark-Securities (the "Paragraph 13(c) License").
Promptly upon request by the Company from time to time, if the Paragraph 13(c)
License has not theretofore terminated, PSE shall deliver to the Company any and
all object code, source code and supporting documentation related to the PSE
Interfaces. The Company may modify the PSE Interfaces from time to time in
connection with the Paragraph 13(c) License; provided that any modification that
impacts the use of OptiMark-Securities for PSE Applications shall be subject to
the prior written approval of PSE, not to be unreasonably withheld or delayed.
The Paragraph 13(c) License is subject to cancellation as described in Section
10 ("Termination") above.

              (d)    Each party will execute, and the IBM Contract will require
IBM to execute, such assignments and other documents as may be necessary to
implement and carry out the provisions of this Section 13, and each party will
cooperate, and the IBM Contract will require IBM to cooperate, with the other
party in obtaining patents, copyright registrations or other proprietary rights
protections for that which the other party is intended to own as provided in
this Section 13.

       14.    CONFIDENTIALITY.

              (a)    PSE and the Company may provide to each other confidential
or proprietary business and technical information in connection with this
Agreement ("Confidential Information"). For the avoidance of doubt, all
technical information relating to OptiMark(TM), OptiMark-Securities and the PSE
Interfaces (including source code) shall be regarded as Confidential
Information. The Company and PSE each shall keep in strict confidence and not
disclose to any other person the Confidential Information of the other party
except as necessary in the normal operation of OptiMark-Securities and the PSE
Interfaces. The Company and PSE agree to use the Confidential Information of the
other party only as necessary for the purposes of this Agreement.

              (b)    Notwithstanding anything to the contrary in Section 14(a)
above, the following will not be considered to be Confidential Information:

                     (i)    information that is now or hereafter becomes
              generally known to the applicable trade without breach of this
              Agreement by the receiving party and its Affiliates;

                     (ii)   information that is shown by the receiving party to
              have been in the possession of the receiving party prior to the
              date of this Agreement, and was not subject to a prior agreement
              of confidence;

                     (iii)  information which, subsequent to disclosure by the
              disclosing party, is lawfully obtained or received by the
              receiving party from a third party, without a breach of this
              Agreement, and without a breach of another agreement of
              confidentiality by the third party;

<PAGE>   12

                     (iv)   information which is developed by an employee of the
              receiving party or a third party having no access to and making no
              use of the disclosing party's Confidential Information; and

                     (v)    information contained in published patent
              applications or patents.

Specific information shall not be deemed to be within the foregoing exceptions
merely because it is embraced in general disclosures. In addition, any
combination of features shall not be deemed to be within the foregoing
exceptions unless the combination itself and its principle of operation are
within the foregoing exceptions.

              (c)    The receiving party agrees to treat the disclosing party's
Confidential Information with at least the same degree of care (but not less
than reasonable care) that it uses in protecting its own confidential
information of a similar nature. The receiving party may disclose the disclosing
party's Confidential Information only to its own employees, officers, directors
and to counsel whose work requires such disclosure for the purpose of this
Agreement. The receiving party (other than counsel) may also disclose the
disclosing party's Confidential Information to individuals having an agent or
consultant relationship with the receiving party, but only if (i) the receiving
party wishes to obtain assistance from such individuals in furtherance of the
purposes of this Agreement; and (ii) such individuals have first executed an
agreement agreeing to hold the disclosing party's Confidential Information in
confidence and use the disclosing party's Confidential Information only in
connection with services performed on behalf of the receiving party. The
receiving party shall cause its Affiliates not to disclose or use the disclosing
party's Confidential Information in a manner which would violate this Agreement.

              (d)    Notwithstanding any of the foregoing, the receiving party
may disclose the disclosing party's Confidential Information if required to do
so by law or pursuant to a subpoena or order of a court or other governmental
entity or self-regulatory organization provided (i) the receiving party promptly
gives the disclosing party prior notice of the requirement to disclose the
Confidential Information and reasonable opportunity to obtain a protective order
or similar relief; and (ii) disclosure is limited to that necessary to comply
with the applicable law, subpoena or order.

              (e)    Neither the execution of this Agreement nor the delivery of
any Confidential Information to the other party shall (unless otherwise
expressly provided herein) be construed as granting any right in or license
under the Confidential Information or under any present or future invention,
patent, patent application, trade secret, trademark or copyright of the
disclosing party.

       15.    REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

              (a)    The Company hereby incorporates and makes unto PSE all of
the Company's representations and warranties set forth in Section 3 of the Stock
Purchase

<PAGE>   13

Agreement and PSE is entitled to rely thereon as though PSE were an "Investor"
(as defined in the Stock Purchase Agreement).

              (b)    The definition of OptiMark-Securities set forth on Exhibit
B to this Agreement accurately describes in all material respects the current
capabilities of OptiMark(TM) and the Company's reasonable expectations as to the
capabilities of OptiMark-Securities. The Company shall use its best efforts to
develop OptiMark-Securities in all material respects consistent with both
Exhibit B and the presentations made to PSE and the members of the Pacific
Exchange.

       16.    DISCLAIMER. The Company acknowledges that, notwithstanding any
occurrence of the Initial Operational Capability Date, PSE has no obligation
ever to make OptiMark-Securities Available (or, if ever made Available, to keep
OptiMark-Securities Available) for any PSE Applications.

       17.    BREACH; INDEMNIFICATION; REMEDIES.

              (a)    In the event of any breach of any representation, warranty
or agreement of the Company in this Agreement that is susceptible to cure, (i)
PSE shall notify the Company of the breach, and (ii) the Company shall have
thirty days following such notice within which to cure the breach. Any curable
breach not so cured within the thirty-day period, and any uncurable breach of
this Agreement, is referred to below as a "Breach".

              (b)    The Company shall indemnify and hold PSE and PSE's
Affiliates harmless from and against any and all claims, causes of action,
liabilities, damages and related costs of investigation and enforcement
(including reasonable attorneys' fees) ("Losses") (unless and except to the
extent caused by the gross negligence, willful misconduct, violation of law
and/or violation of any Rule Changes by PSE and/or its Affiliates) incurred by
PSE and/or its Affiliates arising from or caused by (i) the negligence, gross
negligence or intentional misconduct of the Company, its Affiliates and/or IBM
in connection with this Agreement or the IBM Contract, (ii) the use of
OptiMark-Securities by Users, or (iii) any Breach of this Agreement by the
Company. Notwithstanding the foregoing, the Company shall have no liability to
PSE for any Losses arising from or caused by PSE's failure to comply with its
own constitution or rules, or to perform any obligation or satisfy any duty owed
to its members, their agents and/or their employees thereunder.

              (c)    Promptly following the assertion of any claim that may give
rise to indemnification under paragraph (b), PSE shall give notice of the claim
to the Company and shall demand indemnification therefor. In response, the
Company may notify PSE of the intent of the Company to fully assume defense of
the claim. If the Company assumes defense of the claim, (i) PSE shall provide to
the Company whatever information may be available to PSE and otherwise shall
provide reasonable assistance to the Company with respect to the claim, (ii) PSE
shall be entitled to participate in any related litigation or other proceeding,
using its own counsel at its own expense, (iii) the Company shall have

<PAGE>   14

full charge of the proceedings, (iv) any settlement shall be subject to the
consent of PSE, not to be unreasonably withheld or delayed, and (v) the Company
shall pay any judgment or settlement. The Company's assumption of defense or
failure to assume the defense shall not operate as a waiver of any right it may
have to contest whether the claim was within the scope of Section 17(b). If the
Company does not fully assume defense of the claim, PSE may assume defense of
the claim and the Company shall be bound by any settlement, judgment or other
resolution of the claim achieved by PSE.

              (d)    Section 10 ("Termination") above and paragraph (e)
immediately below set forth the sole and exclusive rights and remedies of the
Company in connection with this Agreement. Except as set forth in Section 10 and
paragraph (e), THE COMPANY HEREBY WAIVES ALL RIGHTS, REMEDIES AND DAMAGES
AGAINST PSE UNDER OR OTHERWISE RELATED TO THIS AGREEMENT, WHETHER SOUNDING IN
CONTRACT, TORT, STRICT LIABILITY OR OTHERWISE. By way of example and not of
limitation, PSE MAKES NO REPRESENTATIONS OR WARRANTIES TO THE COMPANY WHATSOEVER
IN CONNECTION WITH THE PARAGRAPH 13(C) LICENSE, INCLUDING WITHOUT LIMITATION ANY
WARRANTIES AS TO OWNERSHIP, INFRINGEMENT ON INTELLECTUAL PROPERTY RIGHTS OF
THIRD PARTIES, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE. This
paragraph (d) shall apply notwithstanding the failure of any remedy of its
essential purpose.

              (e)    The parties acknowledge that any breach of Section 13
("Ownership; License") or Section 14 ("Confidential Information") above could
not be remedied adequately by damages. Accordingly, upon such a breach, in
addition to any other rights and remedies available under this Agreement, at law
or in equity, the offended party shall be entitled to temporary, preliminary and
permanent injunctive relief against the breaching party from any court of
competent jurisdiction, without bond or other security.

       18.    MISCELLANEOUS.

              (a)    Except as provided above to the contrary, each of the
parties shall bear their own costs and expenses in connection with this
Agreement.

              (b)    All notices required or permitted under this Agreement
shall be in writing and given by prepaid Federal Express or other nationally
recognized overnight delivery service as follows (or to any other addresses
which either party subsequently may designate by notice):

                     i)     if to PSE, to:

                            The Pacific Stock Exchange Incorporated
                            attn:  John C. Katovich, Esq.
                            301 Pine Street
                            San Francisco, CA   94104

<PAGE>   15

                     with a copy in the same manner to:

                            Timothy S. McCann, Esq.
                            Howard, Rice, Nemerovski, Canady, Falk & Rabkin
                            A Professional Corporation
                            Three Embarcadero Center, Suite 700
                            San Francisco, CA   94111

                     ii)    If to the Company, to:

                            OptiMark Technologies, Inc.
                            attn:  William A. Lupien
                            530 Main Avenue
                            Durango, CO   81301

                     with a copy in the same manner to:

                            Bruce Ducker, Esq.
                            Ducker, Seawell & Montgomery, P.C.
                            1560 Broadway, Suite 1500
                            Denver, CO   80202

       (c)    This Agreement shall not be assignable by either party except in
connection with a merger, consolidation, sale of all or substantially all
assets, or analogous transaction in which a third party succeeds to all or
substantially all of the business and assumes all or substantially all of the
liabilities (including the obligations under this Agreement) of one of the
parties hereto. Any non-permitted assignment shall be void ab initio. This
Agreement shall bind and inure to the benefit of the parties and their
respective successors and permitted assigns.

       (d)    Each party, in rendering performance under this Agreement, is
acting solely as an independent contractor. Neither party undertakes by this
Agreement or otherwise to perform any obligation of the other party, whether by
regulation or contract. In no way is either party to be construed as the agent
or fiduciary or to be acting as the agent or fiduciary of the other party in any
respect, or to have the power or authority to bind the other party, legally or
otherwise, any other provisions of this Agreement notwithstanding.

       (e)    This Agreement may be executed in several counterparts, all of
which taken together shall constitute a single agreement between the parties.

       (f)    No delay or omission by either party hereto to exercise any right
or power occurring upon any noncompliance or default by the other party with
respect to any of the terms of this Agreement shall impair any such right or
power or be construed to be a waiver thereof. A waiver by either of the parties
hereto of any of the covenants, conditions, or agreements to be performed by the
other shall not be construed to be a

<PAGE>   16

waiver of any succeeding breach thereof or of any other covenant, condition, or
agreement herein contained.

       (g)    This Agreement, the Purchase Warrant, the Revenue Sharing
Agreement and their Exhibits constitute the entire agreement between the parties
with respect to their subject matter, and all prior negotiations, agreements and
letters of intent are superseded and merged herein. No change, waiver, or
discharge hereof shall be valid unless it is in writing and is executed by the
party against whom such change, waiver, or discharge is sought to be enforced.

       (h)    If any provision of this Agreement shall be held void, voidable,
invalid or inoperative, no other provision of this Agreement shall be affected
as a result thereof and, accordingly, the remaining provisions of this Agreement
shall remain in full force and effect as though such void, invalid or
inoperative provision had not been contained herein. In such event, the parties
agree to negotiate in good faith substitute provisions which shall effect the
parties' original intent in entering into this Agreement as nearly as possible.

       (i)    In the event any party hereto initiates any legal action or suit
in connection with any dispute concerning the interpretation of this Agreement
or the enforcement of any provision hereof, the prevailing party in such action
or suit shall be entitled to recover all of its costs of action or suit
(including without limitation reasonable attorneys' and expert witness fees)
from the other party.

       (j)    This Agreement shall for all purposes be construed and enforced in
accordance with, and governed by, the internal laws of the State of California,
without giving effect to principles of conflict of laws. The exclusive venue for
any litigation related to this Agreement shall be the Superior Court in and for
San Francisco County, California or, if jurisdictionally available, the U.S.
District Court for the Northern District of California.

       IN WITNESS WHEREOF, the parties have set their hands and seals as of the
date first set forth above.

                                   THE PACIFIC STOCK EXCHANGE INCORPORATED

                                   By:  /s/   Robert M. Greber
                                   Chief Executive Officer

                                   OPTIMARK TECHNOLOGIES, INC.

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

<PAGE>   17

                                    EXHIBIT A
                           (to PSE-OptiMark Agreement)

                   FEE SCHEDULE EXCEPTIONS FOR PSE SPECIALISTS

       1.     Blanket Exemption for Trades Aggregating Less Than Average Daily
Volume. Daily trading of U.S. listed equities utilizing OptiMark-Securities by
PSE specialists as a group, up to a total number of shares equal to the average
daily trading volume in U.S. listed equities for such group for the 120 trading
days prior to commencement of trading through OptiMark-Securities of U.S. listed
equities on the Pacific Exchange, shall be exempt from any fee charge regardless
of how the trade is represented in OptiMark-Securities. Specialist trades that
exceed the blanket exemption on a given trading day will be subject to the Fee
Schedule unless exempt under paragraphs 2 or 3 below.

       2.     Specific Exemption for Two Dimensional Orders of 1,000 Shares or
Less. Individual trades by PSE specialists of 1,000 shares or less (or
aggregations of such trades) that specify only price and size and DO NOT use the
multi-dimensional trade representation capabilities of OptiMark-Securities shall
be exempt from any fee charge, whether or not exempt under paragraph 1 above.

       3.     Specific Exemption for Undisplayed Three Dimensional Book Interest
Where No Price Improvement is Obtained. Individual trades of any size by PSE
specialists that result from undisplayed book orders that DO use the
multi-dimensional interest representation capabilities of OptiMark-Securities
but DO NOT receive price improvement over the best bid or offer at a full (1.0)
satisfaction level, shall be exempt from any fee charge whether or not exempt
under paragraph 1 above.

       4.     Other Trades. All other PSE specialist trades executed through
OptiMark-Securities, including trades resulting from orders between exchanges,
that are not otherwise exempt under paragraphs 1, 2 or 3 above, will be subject
to the Fee Schedule. Unexecuted "linked" trades may also be subject to the Fee
Schedule.

<PAGE>   18

                                    EXHIBIT B
                           (to PSE-OptiMark Agreement)

                  DEFINITION OF OPTIMARK-SECURITIES (fka MJTX)

       OptiMark-Securities (the "Service") describes a service to be implemented
and offered to Users by OptiMark Technologies, Inc. or its Affiliates (the
"Company"). The Service will incorporate a market mechanism developed and owned
by the Company and with regard to which patents are pending. The market
mechanism features two innovations: 1) an anonymous and non-disclosed
representation of trading desire in terms of a "satisfaction profile", which may
be thought of as a normalized bivariate (extendible to multivariate) utility
function in price/size space; and 2) a means of optimizing the sequential
allocation of trades between buyers and sellers at different prices and sizes
based upon a measure of "mutual satisfaction."

       The Service will be accessible via TCP/IP network protocols, and access
to the transaction facility will be via network providers of the Users' choice
that might include, for example, Dow Jones Telerate, Bridge or IBM. Customers
will send profiles to a computer facility operated by the Company, where they
will be processed using software incorporating the Company's proprietary
algorithms. The Company will also provide application programming interfaces to
network providers.

       At the User's site, the Service will include a sophisticated graphical
user interface initially running under Microsoft Windows (3.1 through 95), OS/2
or UNIX to simplify and enhance the customers' ability to define and enter
profiles. At the central site, the Service will include a computer to computer
interface (CTCI) for receiving computer-generated profiles. The Service will
process quotation feeds from third parties, including the real-time feeds
available from the Consolidated Quotation Service ("CQS") and the National
Association of Securities Dealers Automated Quotation Service ("NASDAQ").<PAGE>   1
                                                                    EXHIBIT 10.4

                                 NASDAQ/OPTIMARK
                                    AGREEMENT

       THIS AGREEMENT (the "Agreement"), effective as of this 1st day of
September, 1998 (the "Effective Date"), is entered into by and between (i) The
Nasdaq Stock Market, Inc. ("Nasdaq"), a wholly-owned subsidiary of the National
Association of Securities Dealers, Inc. ("NASD"), a national securities
association registered with the United States Securities and Exchange Commission
(the "SEC") under Section 15A of the Securities Exchange Act of 1934 (the
"Exchange Act") and (ii) OptiMark Technologies, Inc. ("OptiMark"), a Delaware
corporation (Nasdaq and OptiMark are collectively referred to herein as the
"Parties"). Unless otherwise defined herein, all capitalized terms used herein
shall have the meanings set forth in Section 25 of this Agreement.

       WHEREAS, OptiMark is planning to develop and implement a system based on
its proprietary technology to permit a trading service for Nasdaq;

       WHEREAS, Nasdaq plans to develop and implement a trading facility that
enables Members and others sponsored by Members to obtain access to the OptiMark
Matching Module and permit the transmission and processing of certain Profiles,
executions, and trade reports of such executions in accordance with applicable
NASD rules;

       WHEREAS, simultaneously with the execution of this Agreement, the Parties
are executing the Warrant Agreement (the "Warrant Agreement") attached hereto as
Exhibit A;

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the Parties intend to be legally bound and
hereby agree as follows:

Page 1

<PAGE>   2

SECTION 1.  PROJECT SCOPE - OVERVIEW

       1.1.   NASDAQ APPLICATION. The Parties agree to offer, as a facility of
the "Nasdaq Stock Market" as that term is defined in NASD Rule 4200(a), a
securities trading application based on the OptiMark Technology to be known as
the "Nasdaq Application." The "Nasdaq Application" for the purposes of this
Agreement shall mean an electronic trading system for Nasdaq Securities that
permits: (i) the entry and transmission of certain Profiles through networks
operated by or for the Nasdaq Family and/or the OptiMark Family to the OptiMark
Matching Module; (ii) participation of such Profiles in a Call; and (iii) the
execution, trade reporting, comparison, clearance, and settlement of the
resulting transactions in the Nasdaq Stock Market. The Parties recognize that
the Complex through which the Nasdaq Application will be made available will
consist of: (a) the portion (including interfaces to (b), below) owned or
operated by the Nasdaq Family which may include a portion of the Nasdaq
Technology; and (b) the portion (including interfaces to (a), below) owned or
operated by the OptiMark Family (including the OptiMark Matching Module as
defined below in this Section 1.1) which may include a portion of the OptiMark
Technology; The "OptiMark Matching Module" shall mean the OptiMark portion of
the Nasdaq Application that receives Profiles in Nasdaq Securities and conducts
periodic Calls. OptiMark hereby agrees to co-locate the OptiMark Matching Module
in the Nasdaq Data Center. The "Nasdaq Technology" shall mean existing and
future portions of a Complex owned by or operated for the Nasdaq Family which it
uses as the base for a customized Complex for use by the Nasdaq Application or
which it uses to support the Nasdaq Application and other applications,
products, or services. The "OptiMark Technology" shall mean existing and future
portions of a Complex owned by or operated for the OptiMark Family which it uses
as the base for a customized Complex for use by the Nasdaq Application or which
it uses to support the Nasdaq Application and other applications, products, or
services.

       1.2.   PURPOSE OF THE AGREEMENT. The Parties shall work as set forth in
this Agreement to develop and implement the Nasdaq Application. The Parties
agree that such development and implementation requires efforts on the part of
both Parties. This Agreement contains a framework for the allocation of the
responsibilities and schedules for developing and operating the Nasdaq
Application.

       1.3.   OPTIMARK'S RESPONSIBILITIES. OptiMark shall make available, as
provided in the Specifications, the OptiMark Matching Module. In addition,
OptiMark shall perform the following: (a) the development and installation work
for a Terminal Program that is adapted for installation with the Nasdaq
Workstation Presentation Device software with messages transmittable through the
EWN or VPN; (b) the development and installation work for software that permits
effective interfaces between the OptiMark Matching Module and the Nasdaq portion
of the Nasdaq Application related to trade reporting, comparison, and clearance
and settlement processes; (c) make available OptiMark provided network(s); and
(d) such other tasks as assigned to it in the Specifications or as agreed to by
the Parties to develop and implement the Nasdaq

Page 2

<PAGE>   3
Application, including any development and installation tasks necessary to
receive information from the Terminal Program installed in the EWN environment.
OptiMark agrees that except for its work on the current version of the Pacific
Exchange, Inc. (the "PCX Application"), OptiMark will give its top priority to
the Nasdaq Application and that no other OptiMark application or version will
become operational until after the Operational Commencement Date; provided,
however, that if commencement of the Nasdaq Application is delayed more than
four (4) calendar months past the Critical Milestone Operational Commencement
Date stipulated by the Parties as of the Effective Date, OptiMark may proceed
with its work to make such other OptiMark applications or versions operational,
while continuing to use commercially reasonable efforts to continue performance
under this Agreement.

       1.4.   NASDAQ'S RESPONSIBILITIES. Nasdaq shall make available, as
provided in the Specifications, one or more separate types of networks through
which Profiles may be transmitted from the Nasdaq Workstation II environment
(the "Nasdaq Workstation"): (i) the Enterprise Wide Network (the "EWN") and (ii)
potentially, Virtual Private Network(s) used or to be developed by Nasdaq (the
"VPN") for the subscribers of the Nasdaq Workstation that use the Nasdaq
Workstation Presentation Devices. Nasdaq also shall provide the facilities
management necessary to operate the Nasdaq Application as provided in the
Specifications. In addition, Nasdaq shall perform the following development and
installation work: (a) develop a means to permit installation of the OptiMark
developed Terminal Program (that is adapted for installation with the Nasdaq
Workstation Presentation Device software) on applicable Nasdaq Workstation
Presentation Devices; (b) develop an ability for messages transmitted from the
OptiMark developed Terminal Program (that is adapted for installation with the
Nasdaq Workstation Presentation Device software ) to flow through the Nasdaq
provided networks; (c) develop an interface with the OptiMark portion of the
Nasdaq Application to permit transmission of the results of a Call to Nasdaq's
trade reporting, comparison, and clearance and settlement systems; and (d) such
other tasks as assigned to it in the Specifications or as agreed to by the
Parties to develop and implement the Nasdaq Application.

       1.5    ALLOCATION OF RESPONSIBILITIES. The Parties are uncertain as of
the Effective Date whether a VPN, institutional servers, or distribution servers
will be necessary to implement this Agreement. In the event that such VPN,
institutional servers, or distribution servers prove necessary, the Parties are
agreed that the development, procurement, and installation of the VPN shall be
the responsibility of Nasdaq and the development, procurement, and installation
of the institutional servers, or distribution servers shall be responsibility of
OptiMark.

       1.6.   SCOPE OF THE AGREEMENT. The Parties recognize that certain
national securities exchanges may trade Nasdaq Securities pursuant to the
Unlisted Trading Privileges ("UTP") Plan for Nasdaq Securities. Nothing in this
Agreement is intended to preclude OptiMark from offering its technology,
directly or indirectly, to any such exchange for the trading of Nasdaq
Securities; provided, however, that no network,

Page 3

<PAGE>   4

network device, central computer processor or any other portion of the Nasdaq
Application shall be used to trade Nasdaq Securities on such exchange without
express written agreement by Nasdaq. Where an OptiMark provided network or
Terminal Program does not use any of the Nasdaq Technology to trade Nasdaq
Securities, the above consent is not required for use of the network or Terminal
Program. Further, with respect to any such UTP application, the Parties agree
that, while this Agreement is in effect, unless a Person entering a Profile
specifically designates that the Profile is to be processed through the UTP
application, the Profile shall be processed through the Nasdaq Application and
reported as a Nasdaq trade for credit to Nasdaq for tape revenue purposes.
Anything herein to the contrary notwithstanding, OptiMark may develop a Terminal
Program at its own expense to enable End-Users to use the Nasdaq Workstation to
enter Profiles in securities listed on a national securities exchange, subject
to (a) further agreement between the Parties and (b) an appropriate service
charge arrangement as agreed to by the Parties.

       1.7.   TWO STAGES. The Parties agree that the Nasdaq Application shall be
developed and implemented in at least two stages. During the initial stage of
their efforts (the "First Stage"), the Parties shall develop and implement,
among other things, capabilities to allow End-Users to send Profiles from the
Nasdaq Workstation through the EWN and the VPN. During the First Stage, the
Parties shall develop and implement capabilities to permit the participation of
the national best bid and offer Quotes ("BBO") in Calls. During the subsequent
stage of their efforts (the "Second Stage"), which shall be completed within a
reasonable time period after completion of the First Stage, the Parties may
create automated mechanisms for participation of other portions of the Nasdaq
Quote Montage in Calls. However, the Parties agree that if the Nasdaq Family
determines to adopt a trade-through rule for the Nasdaq Stock Market, it may
require the Parties to accelerate the Second Stage development activities to
overlap and interact with the First Stage work. The Parties agree to identify
the need for any such efforts as soon as possible, during the Specifications
Phase if possible, and modify the Specifications (including the Critical
Milestone Dates set forth in Schedule II) accordingly.

       1.8.   FOUR PHASES. The Parties expect to complete the First Stage over
the course of the following four Phases, which may overlap and interact: (i) the
Specifications Phase; (ii) the Development Phase, (iii) the Installation and
Acceptance Phase and (iv) the Operational Phase. The Parties agree that the
Second Stage may follow the same or similar Phases.

Page 4

<PAGE>   5

SECTION 2.  SPECIFICATIONS PHASE

       2.1.   SPECIFICATIONS. During the Specifications Phase, the Parties shall
develop detailed operational and functional specifications (the
"Specifications") for the Nasdaq Application that expands on the specifications
agreed to on the Effective Date and reflected in the Schedules. As used in this
Agreement, the term "Specifications" shall incorporate time schedules, equipment
requirements and other Schedules referenced in this Agreement. The
Specifications shall allocate the development and implementation
responsibilities of each Party as set forth in sections 1.3, 1.4, and 1.5 and
shall describe, but not be limited to, the following:

       (a)    functional specifications (including network specifications for
       using TCP/IP to transmit messages through the EWN and VPN);

       (b)    the procedures by which workstations, servers and/or
       communications capabilities provided directly or indirectly by the
       OptiMark Family may be used by End-Users who are Members or who have made
       appropriate arrangements with Members (as described below) to submit
       Profiles for participation in a Call;

       (c)    the procedures by which the Nasdaq Workstation may be used by
       End-Users who are Members or who have made appropriate arrangements with
       Members (as described below) to submit Profiles for participation in a
       Call;

       (d)    the requirements for the EWN and the VPN that will allow End-Users
       to submit Profiles from the Nasdaq Workstation for participation in a
       Call;

       (e)    the procedures for Designated Brokers to establish and update
       trading authority limits;

       (f)    the procedures for conducting post-trade operations (including
       online comparison, trade reporting, and clearance and settlement
       communications interfaces);

       (g)    the requisite personnel and Complex to be delivered or made
       available to each Party by the other Party in connection with the
       development and implementation of the Nasdaq Application;

       (h)    the required configurations for each component;

       (i)    the procedures and personnel needed for the coordination of Nasdaq
       and OptiMark help desks and their respective responsibilities including
       those for detecting problems and resolving issues;

       (j)    the disaster recovery capabilities and installations;

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<PAGE>   6

       (k)    the site locations and requirements, including the procedures
       related to the co-location of the OptiMark Matching Module in the Nasdaq
       Data Center;

       (l)    trading capacity and issues related thereto;

       (m)    length of up-time and systems availability and requirements
       relating thereto;

       (o)    response times for the processing environment and the OptiMark
       Matching Module, including the requirement that, with respect to Calls,
       the OptiMark Matching Module shall complete the vast majority of all
       Calls within 4 seconds and shall truncate any Call not completed within 4
       seconds;

       (p)    the hours of operation of the Nasdaq Application;

       (q)    interim and final acceptance test criteria, specifications, and
       procedures for the Nasdaq Application (including, but not limited to the
       following tests: integration, quality control, Year 2000, user
       acceptance, stress, and operational recovery), as well as the
       requirements for on-site personnel of the other Party needed during the
       testing;

       (r)    interaction between different components of the four Phases and
       their sequencing, including the appropriate interval for each of the
       Phases following completion of the initial Specifications Phase;

       (s)    any development efforts that the Parties agree to accelerate from
       the Second Stage;

       (t)    security procedures;

       (u)    archival and backup capabilities;

       (v)    a timetable for the performance of each task (or completion of
       each deliverable) to be performed by a party;

       (w)    feeds and interface specifications with regulatory systems;

       (x)    functional specifications for integrating the BBO to permit the
       generation of Profiles based on eligible Quotes and subsequent
       participation of such system-generated Profiles in a Call;

       (y)    the procedures for incorporating the BBO (the best bids and offers
       of market participants) from Quotes collected, furnished, or supplied,
       directly or

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<PAGE>   7

       indirectly by Nasdaq, upon the terms and conditions reasonably
       established by the Parties;

       (z)    the procedures whereby OptiMark adjusts any potential match from a
       Call involving any portions of the BBO, which Quote has been canceled or
       executed during the Call; and

       (aa)   OptiMark will obtain appropriate software and development
       equipment for developing and testing its system. Nasdaq will provide
       appropriate facilities and personnel to support OptiMark's development,
       QA, and production systems, 7 by 24, as needed and agreed to by both
       Parties.

       2.2.   MILESTONE DATES. When Schedule I and II are finalized, they shall
be as if attached and incorporated into this Agreement. Schedule II shall
include a list of certain Milestone Dates labeled as "critical" for successful
and timely implementation of the Nasdaq Application (the "Critical Milestone
Dates"). Anything herein to the contrary notwithstanding, the Critical Milestone
Dates may only be altered by written agreement of officers of the Parties. The
Parties recognize that all deliverables and schedules related to such
deliverables, including the Milestone Dates but not including the Critical
Milestone Dates, are based on certain assumptions about the basic
functionalities of each other's system and that each deliverable and schedule
related to the deliverable are contingent on the terms and conditions preceding
the event, as specified in Specifications. The Parties recognize that if
regulatory approvals are not obtained by the Critical Milestone Date, the
Parties will have to agree to change all subsequent schedules related to such
deliverables, including Milestone Dates and the Critical Milestone Dates. With
respect to the First Stage, the Parties shall complete the "Final
Specifications" by the Critical Milestone Date. The Parties agree that within
five (5) Business Days of the Effective Date, each Party shall provide to the
other Party the names of its staff that shall be responsible for drafting the
Specifications and that such individuals shall conduct their first meeting to
commence the drafting process no later than ten (10) Business Days after the
Effective Date. Thereafter, the drafters shall meet (by telephone,
video-conference, in person, or otherwise) at least weekly, until the
Specifications are completed. If operational or functional Specifications must
be modified after the Final Specifications are drafted, the Parties agree to
follow the procedures in Section 2.3 below.

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       2.3.   MODIFICATIONS.

              2.3.1. Prior to the Operational Commencement Date, a Party may
request a modification to the Final Specifications, which request shall be
presented to the other Party in writing. Any such request shall indicate whether
the modification, in the reasonable and good faith judgment of the requesting
Party, would result in an extension of, or other change to, the Installation
Schedule and/or the Milestone Dates schedule or result in an increase in the
cost of development or operation of the Nasdaq Application. If a Party believes
that the request for modification (other than the modification contemplated
under Section 1.7 of this Agreement) is not commercially practicable based on
the determination that it will not recover its allocated costs for the requested
modification, plus a reasonable return on such costs, in a reasonable time
frame, such impracticability will be raised as a Dispute under the ADR and
Arbitration Provisions of the Agreement. The modification will be deemed
effective upon the written agreement of the other Party to such written request
or the decision of the arbitrator, and the Schedules attached hereto, to the
extent applicable, shall be deemed amended from the date thereof.

              2.3.2. The Parties expect that after the Nasdaq Application
becomes operational, ongoing modifications and enhancements to the Nasdaq
Application may be necessary throughout the term of this Agreement. Such
requests shall be handled under Section 10.5.2 of this Agreement.

       2.4.   EXTENSION OF MILESTONE DATES.

              2.4.1. The Parties acknowledge that although they may agree, from
time to time, to modify schedules and other important Milestone Dates, due to
the limits on each other's resources and the need to come to market, neither
Party has wide-ranging flexibility to extend a Critical Milestone Date as may be
requested by the other Party. Anything herein to the contrary notwithstanding,
in the event of any delay in meeting a Critical Milestone Date, other than an
event of Force Majeure discussed below in Subsection 2.4.2, a Party shall be
excused from meeting the Critical Milestone Date and shall not be subject to any
Event of Default or Event of Termination on the account of any such delay, if
the Party shall (i) promptly notify and keep the other Party informed of the
work in progress to complete the task at hand and (ii) pay to the other Party a
liquidated damages amount (which the Parties agree represents their good faith
attempt to estimate an amount of the increased costs or damage to the other
Party caused by the delays but which appears to be an amount incapable of
precise calculation) of $5,000.00 (Five Thousand Dollars) for each Business Day
past the 30-Day cure period for the Critical Milestone Date. Each Critical
Milestone Date shall be appropriately extended, Day-for-Day, in the event that
the liquidated damages are paid hereunder, provided however, that anytime after
the earlier of the Critical QC Delivery Date or a total of 90 Days after the
Critical Milestone Date, the non-breaching Party may terminate this Agreement.

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              2.4.2. Each Party shall be excused from delays in performing under
this Agreement, and the schedules and Milestone Dates (including the Critical
Milestone Dates) shall be appropriately extended, Day-for-Day, to the extent
that such delays result from an event of Force Majeure and while the effect of
such event is continuing, unless and until the Agreement is terminated in
accordance with Section 18 of this Agreement.

SECTION 3.  DEVELOPMENT PHASE

       3.1.   DEVELOPMENT TASKS. During the Development Phase, the Parties shall
commence development of the Nasdaq Application in accordance with the
Specifications. In furtherance thereof, the Parties shall, during the
Development Phase, take the following actions:

       (a)    OptiMark shall develop and internally test, at its own expense,
the OptiMark Matching Module to match Profiles in Nasdaq Securities, as provided
in the Specifications. In addition, OptiMark shall develop and internally test,
at its own expense, such other tasks as described in this Agreement, assigned to
it in the Specifications, or as agreed to by the Parties, including the
development of the appropriate Terminal Program for the Nasdaq Workstation. The
OptiMark Matching Module and all other components and functions of the Nasdaq
Application developed by or operated for OptiMark hereunder shall satisfy the
Specifications in all material respects.

       (b)    Nasdaq shall develop and internally test, at its own expense, the
capability of messages from the Nasdaq Workstation to flow through the EWN and
the VPN for delivery to and from the OptiMark Matching Module, as provided in
the Specifications. In addition, Nasdaq shall develop and internally test, at
its own expense, such other tasks as described in this Agreement, assigned to it
in the Specifications, or as agreed to by the Parties. The components and
functions of the Nasdaq Application developed by or operated for Nasdaq that
affect the ability to effect and process a transaction resulting from a Call,
shall satisfy the Specifications in all material respects.

SECTION 4.  INSTALLATION AND ACCEPTANCE PHASE

       4.1.   INSTALLATION SCHEDULE. During the Installation and Acceptance
Phase, the installation of the Nasdaq Application shall be phased in according
to the schedule (the "Installation Schedule") in the Specifications. The
Installation Schedule shall reflect the timing for the installation and
connection of various components of the Nasdaq Application (including the
OptiMark Matching Module and the installation of Terminal Programs at End-User
sites). The Parties shall use commercially reasonable efforts to minimize
deviations from the Installation Schedule by assigning the necessary resources
to the project activities.

       4.2.   DELIVERY. The Parties shall exert commercially reasonable efforts
to deliver each component of the Nasdaq Application (including the OptiMark
Matching

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Module) on the estimated delivery date applicable to such component as set forth
in the Specifications (the "Delivery"). The entire Nasdaq Application shall be
delivered as of the date for Delivery of the final component of the Nasdaq
Application as provided in the Specifications.

       4.3.   ACCEPTANCE TESTS

       (a)    Each Party shall cooperate with the other Party to perform its own
interim integration, stress, and other acceptance tests for the Nasdaq
Application to ensure operability and compliance with the Specifications.
Acceptance tests by Nasdaq shall include certain quality control and stress
tests conducted after the completion of the Installation Schedule that are
customary and routine to the Nasdaq Stock Market and may include End-User
testing (the "Nasdaq QC Tests"). Upon successful completion of the Nasdaq QC
Tests, Nasdaq shall execute and deliver to OptiMark a Certificate of Acceptance,
indicating its acceptance of the Nasdaq Application. Anything herein to the
contrary notwithstanding, the Parties agree that final responsibility for
declaring the Nasdaq Application ready for operation remains with Nasdaq.

       (b)    Interim acceptance tests may be performed by either Party, which
shall indicate the relevant stage, component or configuration which is being
accepted. Preliminary acceptance or necessary modification thereto shall be
agreed to by the Parties within the specified time period as provided in the
Specifications. Anything herein to the contrary notwithstanding, the Parties
agree that a Party's testing or acceptance of any interim stage, component or
configuration shall not be deemed to be acceptance of that stage, component or
configuration during any subsequent interim test or the Nasdaq QC Test, nor act
as a waiver or estoppel to perform other tests, or the Nasdaq QC Tests on any
stage, component or configuration of the final Nasdaq Application.

       (c)    If the Nasdaq Application fails to meet any applicable Nasdaq QC
Test and if such failure did not result from (i) material failure of the Nasdaq
portion of the Nasdaq Application to meet relevant parts of the Specifications
or (ii) Nasdaq controlled conditions which were foreseeable to Nasdaq but
undisclosed to OptiMark such that it was not commercially reasonable for
OptiMark to react to such, Nasdaq shall promptly notify OptiMark in writing of
such failure and OptiMark shall correct, modify or improve its work, as the case
may be, to meet the criteria set forth in the applicable Nasdaq QC Test within a
reasonable time frame necessary to meet the Critical Milestone Operational
Commencement Date. Nasdaq shall thereafter reinitiate and complete one or more
additional rounds of Nasdaq QC Tests until such time as when OptiMark either
passes the Nasdaq QC Tests or the Critical Milestone Date passes, in which case
Nasdaq may thereafter terminate this Agreement. In the event that the failure to
pass the Nasdaq QC Test by the Critical Milestone Date is a result of (i) or
(ii) of this sub-section, then OptiMark may thereafter terminate this Agreement.

       4.4.   NOTIFICATION OF DELAY OR FAILURE. In order to anticipate and
reduce the effect of delays or failures, the Parties agree to notify each other
as soon as there is any

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reason to believe that any Delivery will be delayed and/or that the Nasdaq
Application will fail to meet the Specifications.

SECTION 5.  OPERATIONAL PHASE

       5.1.   COMMENCEMENT.

              5.1.1. The Parties agree that the Operational Commencement Date is
subject to regulatory approval and successful completion of all development,
installation and testing requirements as agreed to in the Specifications. The
Parties recognize that the Operational Commencement Date may not be met despite
the Parties' commercially reasonable efforts to do so. However, the Parties also
recognize that Year 2000 issues may require Nasdaq, OptiMark, government
regulators and/or End Users to refuse to allow the introduction of new
computerized facilities into the Nasdaq Stock Market at a currently unspecified
date in the latter half of 1999 ("Year 2000 Lockdown"). Accordingly, because a
Year 2000 Lockdown may prevent the introduction of the Nasdaq Application until
an unspecified time in 2000, the Parties agree to make Best Efforts to avoid
delays in an Operational Commencement Date that could overlap with any Year 2000
Lockdown on new trading facilities. The Parties agree that subject to Sections
18.2(c) and 18.2(d), they must meet the Critical Milestone Operational
Commencement Date, as such date was agreed to on the Effective Date or changed
thereafter.

              5.1.2. The Operational Phase shall commence on the date (the
"Operational Commencement Date") on which (i) all Regulatory Approval has been
obtained and (ii) Nasdaq shall have delivered to OptiMark an executed
Certificate of Acceptance. On the Operational Commencement Date, Nasdaq
End-Users shall have access to, and may commence trading through, the Nasdaq
Application.

              5.1.3. During the Operational Phase, the Nasdaq Application shall
be available for End-Users to purchase and sell Nasdaq Securities. During the
Operational Phase, each Party shall operate and maintain its respective portion
of the Nasdaq Application so that it continues to meet the Specifications and
all other provisions of this Agreement, including the provisions relating to the
staffing, training and the Parties' respective help desks. Each Party shall (i)
ensure proper machine configuration, program installation, audit controls,
including archival material and operating methods, including any backup tapes,
(ii) work to establish adequate backup plans to ensure proper functioning of the
Nasdaq Application in the event of any failure of the primary system located in
the Nasdaq Data Center, and (iii) implement sufficient procedures to satisfy its
requirements for security and accuracy of input and output as well as restart
and recovery in the event of malfunction; (iv) correct in a timely manner errors
or malfunctions of the Nasdaq Application, (v) implement in a timely manner
modifications, revisions, enhancements or upgrades to the Nasdaq Application as
agreed to by the Parties and (vi) ensure compatibility of the Specifications
with any changes in law, subject to Section 10.5.2 below.

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       5.2.   OPERATIONAL PROBLEMS. Each Party shall inform the other of any
known defects in its portion of the Nasdaq Application, including, in the case
of OptiMark, any known defects in the OptiMark Matching Module which might
materially interfere with the operation or use of the Nasdaq Application.
OptiMark shall promptly make commercially reasonable efforts to correct coding
errors, bugs and/or other operational problems (and supply Nasdaq with
replacement documentation and media therefor) of, or resulting from, the
OptiMark Matching Module or any other component of its portion of the Nasdaq
Application, including those brought to the attention of OptiMark by Nasdaq, and
Nasdaq shall promptly make commercially reasonable efforts to correct coding
errors, bugs and/or other operational problems (and supply OptiMark with
replacement documentation and media therefor) of, or resulting from its portion
of the Nasdaq Application, including those brought to the attention of Nasdaq by
OptiMark.

       5.3    VIRUSES, TIME BOMBS, TRAP DOORS. Each Party shall promptly notify
the other of any defects in relevant security mechanisms of which it has actual
knowledge, such as Time Bombs, Viruses, Trap Doors, or similar devices. The
Parties shall use Best Efforts to disable and/or correct any such defects, such
as Time Bombs, Viruses, Trap Doors, or similar devices.

       5.4.   MARKET OR SYSTEM EMERGENCIES. Nasdaq, in its sole discretion, may
intervene and take any action with respect to its portion of the Nasdaq
Application that Nasdaq deems reasonably necessary, if there shall be or shall
be threatened, in either case in Nasdaq's sole judgment, a market or operational
emergency -- including, without limitation, any event or circumstance under
which the OptiMark Matching Module, or the Nasdaq Application as a whole,
threatens or is expected to threaten, the effective and orderly operation of the
Nasdaq Stock Market or otherwise poses a threat to its systems. Subject to
Nasdaq's statutory obligations, court action, and any SEC action (or action of
other body with regulatory or oversight jurisdiction over any part of the Nasdaq
Family), such action by Nasdaq may include temporarily disconnecting the Nasdaq
Application until Nasdaq determines, in its sole discretion, that such market or
operational emergency (or threat thereof) no longer exists. Nasdaq shall make
reasonable efforts under the circumstances confronting Nasdaq at the time of the
market or system emergency to notify OptiMark prior to taking any action under
this Section or promptly thereafter. Nothing in this Agreement is intended to
preclude the OptiMark Family from continuing to operate other applications in a
market other than the Nasdaq Stock Market. Nasdaq shall provide OptiMark with
material information relating to its policies and procedures for identifying and
handling market or operational emergencies, which information may be modified by
Nasdaq from time to time to reflect its current practice. Nothing in such
information prohibits Nasdaq from taking other or additional steps not
identified therein if Nasdaq, or the Nasdaq Family, determine that such other
steps are necessary and consistent with its authority under SEC and NASD Rules.

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SECTION 6.  SECOND STAGE DEVELOPMENTS

       6.1.   SPECIFICATIONS. The Parties agree that a Second Stage of the
Nasdaq Application shall be developed to permit an automated mechanism for the
participation of portions of the Nasdaq Quote Montage (such as a Nasdaq limit
order file) in Calls. The Specifications shall allocate the development and
implementation responsibilities of each Party and describe, but not be limited
to, the following:

       (a)    functional specifications for integrating the portions of the
Nasdaq Quote Montage to permit the generation of Profiles based on eligible
Quotes and subsequent participation of such system-generated Profiles in a Call;

       (b)    the procedures for incorporating the portions of the Nasdaq Quote
Montage from Quotes furnished by market makers and ECNs upon the terms and
conditions reasonably established by the Parties; and

       (c)    the procedures whereby OptiMark adjusts any potential match from a
Call involving any portions of the Nasdaq Quote Montage, which Quote has been
canceled or executed during the Call;

       6.2.   ACCESS TO OTHER SYSTEMS. The Parties agree that notwithstanding
obligations hereunder, as a part of a self-regulatory organization, Nasdaq has
legal and regulatory obligations mandated by statute regarding access to
services and facilities provided by other software developers and/or Members.
Accordingly, Nasdaq shall handle any such requests for access in a manner
described in the Nasdaq Letter.

SECTION 7.  STEERING COMMITTEE

       7.1.   PROJECT COORDINATORS; STEERING COMMITTEE. No later than five
Business Days after the Effective Date, (i) each Party shall appoint a project
coordinator (the "Project Coordinator") that will be the primary contact between
the Parties hereto and who will have the authority to bind the Parties and (ii)
the Parties shall jointly establish a steering committee (the "Steering
Committee") to supervise the performance of the Parties pursuant to this
Agreement and to address legal, technical, operational, and regulatory issues
that arise out of the operation of the Nasdaq Application. The Steering
Committee shall initially be comprised of two members from the Nasdaq Family and
two members from OptiMark. Each Party may re-designate its respective appointees
for the Project Coordinator and the Steering Committee as deemed appropriate in
its sole discretion.

       7.2.   MEETINGS. The Steering Committee shall meet, either in person or
by or a conference call, every two weeks until the end of the Development Phase
and at least quarterly thereafter to discuss the development, implementation and
operation of, and regulatory and other issues arising in connection with the
OptiMark Matching Module or

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the Nasdaq Application, as appropriate, (including their Specifications,
development, installation and acceptance, or operations). The Steering Committee
shall appoint one or more members to prepare an advanced agenda for each meeting
and shall record the minutes and action items for each meeting (in the absence
of such designation, OptiMark shall be responsible).

       7.3.   PROGRESS REPORT. After each meeting or conference call, the
appointed Steering Committee member(s) shall (and any other member may) prepare
a report (a "Progress Report") specifying in detail:

       (a)    any critical problem encountered, discovered, or continuing during
the preceding two week period or quarter, as the case may be, including, without
limitation, the failure of either Party in performing, any delay of either Party
in performing or the inadequate performance of either Party which may prevent or
tend to prevent completion of any task by the Milestone Dates set forth on
Schedule II;

       (b)    the estimated length of any project delay which may result from
any critical problem; and

       (c)    the specific steps taken or proposed to be taken by either or both
Parties, as appropriate, to remedy such critical problem.

SECTION 8.  STAFFING AND TRAINING.

       8.1.   MUTUAL OBLIGATION TO PROVIDE INFORMATION. Each Party shall make
available to the other Party such information and personnel knowledgeable in its
operations as specified in the Specifications or agreed to by the Parties to
facilitate timely completion of a Party's obligations. The Parties shall staff
the project in accordance with the Specifications or as otherwise agreed to
hereafter.

       8.2.   TRAINING. (a) OptiMark shall provide all reasonable instruction
and training to enable Nasdaq (i) to understand the operations and functioning
of the OptiMark Matching Module and other OptiMark developed aspects of the
Nasdaq Application, (ii) to effectively work with OptiMark to develop the
Specifications during the Specifications Phase, (iii) to effectively develop the
portion of the Nasdaq Application for which Nasdaq is responsible, (iv) to
perform integration, stress and other tests on the Nasdaq Application, (v) to
ensure operability and compliance with the Specifications, (vi) to effectively
operate and maintain its portion of the Nasdaq Application, and (vii) to
effectively react to emergency situations.

       (b)    Nasdaq shall provide all reasonable instruction and training to
enable OptiMark (i) to understand the operations and functioning of Nasdaq's
Workstations and End-User requirements and other Nasdaq developed aspects of the
Nasdaq Application that are necessary for OptiMark to perform its obligations
under this Agreement, (ii) to effectively work with Nasdaq to develop the
Specifications during the Specification

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Phase, (iii) to effectively develop the components of the Nasdaq Application for
which OptiMark is responsible, (iv) to perform integration, stress and other
tests on the Nasdaq Application, (v) to ensure operability and compliance with
the Specifications, (vi) to effectively operate and maintain its portion of the
Nasdaq Application and (vii) to effectively react to emergency situations.

       8.3.   POLICIES. Each Party, while on the premises of the other Party,
shall obey, and instruct their employees, agents and contractors to obey all
security, access, safety and other designated policies, including drug and
sexual harassment policies and policies of landlords for the protection of the
other Party's facilities and employees and shall reassign any Person whom the
other Party objects to having on its premises for a bona fide business reason
and shall replace such Person unless such reassignment would violate applicable
law.

SECTION 9.  FACILITIES

       9.1.   FACILITIES MANAGEMENT - DATA CENTER. The Parties agree that Nasdaq
shall provide the facilities management necessary to operate the Nasdaq
Application, as outlined in the Specifications. Nasdaq shall provide the Nasdaq
Data Center as the site used to build and house the production environment for
the OptiMark Matching Module and other relevant components of the Nasdaq
Application. Nasdaq shall make available at the Nasdaq Data Center capabilities,
managed operations, help desk and network infrastructure required for the
integration of the OptiMark Matching Module into the rest of the Nasdaq
Application as listed in the Specifications. OptiMark shall make available at
the Nasdaq Data Center capabilities for a help desk and software support.
OptiMark shall visually inspect the sites prior to Delivery, and shall notify
Nasdaq whether or not there are any noticeable deviations from the
Specifications. OptiMark shall have the right to enter the Nasdaq Data Center
and inspect and maintain the OptiMark portion of the Nasdaq Application housed
therein at all reasonable times.

       9.2.   EQUIPMENT. Each Party shall provide all requisite software,
hardware and other equipment assigned to it in the Specifications or as agreed
to by the Parties and shall be responsible for their maintenance thereafter.
With respect to hardware requirements, the Parties have already agreed that: (a)
OptiMark shall provide, at its own expense, the computer hardware and software
that OptiMark believes are necessary to meet the OptiMark Matching Module
Specifications, including Tandem Computers and DEC Alphas (or other hardware
make or type); and (b) Nasdaq shall contract with a vendor and provide at its
own expense the necessary circuits for any VPN End-Users.

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SECTION 10.  REGULATORY MATTERS

       10.1.  REGULATORY APPROVALS. Promptly after the Effective Date, with the
cooperation and assistance of OptiMark, Nasdaq shall cause to be prepared and
cause a rule filing (the "Rule Filing") to be filed with the SEC (or other body
with regulatory or oversight jurisdiction over any part of the Nasdaq Family)
and use its Best Efforts to pursue approval of the Rule Filing by the SEC (or
other body with regulatory or oversight jurisdiction over any part of the Nasdaq
Family) ("Regulatory Approval"). OptiMark shall use its Best Efforts to support
the approval of the Rule Filing. The Rule Filing shall state, among other
things, that Members will be responsible, as a regulatory matter under the
Exchange Act, for all Profiles, orders and resulting transactions for their own
accounts or their customer's accounts and shall include, among other things, an
exculpation of the OptiMark Family in form and substance satisfactory to the
Parties in connection with any action taken by Nasdaq under Section 5.4 of this
Agreement. The Nasdaq Family shall submit the Rule Filing by the relevant
Critical Milestone Date, or such other date as the Parties shall agree. After
the Operational Commencement Date, if an obligation of a Party under the
Agreement requires SEC action or approval (or action or approval of other body
with regulatory or oversight jurisdiction over any part of the Nasdaq Family),
such Party is not obligated to perform that obligation until requisite
regulatory approval has been obtained.

       10.2.  COOPERATION. Nasdaq shall cooperate with OptiMark in connection
with OptiMark's regulatory requirements that are reasonably related to the
Nasdaq Application. If any portion of the OptiMark Family registers as a broker,
dealer, or self-regulatory organization in the United States (or the equivalent
of any of these overseas where there is a material adverse affect on The Nasdaq
Application or the Nasdaq Family) that is not required or mandated by a
governmental agency with regulatory oversight over any portion of the OptiMark
Family and applied for prior to the Operational Commencement Date shall be
grounds for Nasdaq, after ADR, to terminate this Agreement. If any portion of
the OptiMark Family registers as a broker, dealer, or self-regulatory
organization in the United States (or the equivalent of any of these overseas
where there is a material adverse affect on The Nasdaq Application or the Nasdaq
Family) that is required or mandated by a governmental agency with regulatory
oversight over any portion of the OptiMark Family and applied for prior to the
Operational Commencement Date shall be grounds for Nasdaq, after ADR, to
terminate this Agreement, but neither Party is entitled to invoke Section 18.4.
Any materially adverse change in regulatory status of any portion of the
OptiMark Family (e.g., registration as a broker, dealer, or self-regulatory
organization, or the equivalent of such status overseas) after the Operational
Commencement Date shall be treated under Section 10.5.2.

       10.3.  GOVERNMENT DEALINGS. The Parties shall cooperate with each other
(including the OptiMark Family and the Nasdaq Family) regarding all governmental
applications, reports, filings, audits, and formal and informal information
inquiries

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(including Automation Review Policies) that are reasonably related to the Nasdaq
Application.

       10.4.  REGULATORY REQUESTS. The Parties acknowledge and agree that
implementation of the Nasdaq Application is subject to Regulatory Approval in
advance and continued oversight by the SEC (or other body with regulatory or
oversight jurisdiction over any part of the Nasdaq Family) which may include
governmental audits, information requests, and other similar matters. Subject to
Section 10.5 below, the Parties agree to take whatever action may be reasonably
necessary to comply with all SEC (or other body with regulatory or oversight
jurisdiction over any part of the Nasdaq Family) regulations and requirements,
including, but not limited to, modifying the operation of the Nasdaq
Application.

       10.5.  COMMERCIAL PRACTICABILITY.

              10.5.1. Anything herein to the contrary notwithstanding, prior to
the Operational Commencement Date, if any modification to the Final
Specifications (other than the modification contemplated under Section 1.7 of
this Agreement) is requested by the Nasdaq due to SEC action or inaction (or
action or inaction of other body with regulatory or oversight jurisdiction over
any part of the Nasdaq Family) that was not foreseeable by OptiMark on the
Effective Date and if such request is not commercially practicable, OptiMark may
refrain from making the requested modification. OptiMark shall notify Nasdaq in
writing along with a reasonably detailed description of the problem, the
anticipated impact of the problem, estimates of development and operation costs,
and any other information that is deemed material in the reasonable and good
faith judgment of Nasdaq. In the event the refraining from the obligation
substantially affects the value of the entire Nasdaq Application or makes
performance of the Agreement as a whole not commercially practicable, Nasdaq may
terminate the Agreement, and seek recovery under Section 18.4, but limited to $2
million.

              10.5.2. After the Operational Commencement Date, if a Party
believes that any of its obligations under the Agreement are no longer
commercially practicable, whether due to SEC action or inaction (or action or
inaction of other body with regulatory or oversight jurisdiction over any part
of the Nasdaq Family), a modification or requested modification of the Nasdaq
Application, or any other reason (among other reasons, based on the
determination that it will not recover its allocated costs, plus a reasonable
return on such costs, in a reasonable time frame), such impracticability will be
raised as a Dispute under the ADR Provisions of the Agreement. A written notice
shall be presented to the other Party and shall include a reasonably detailed
description of the problem, the anticipated impact of the problem, (if
applicable) estimates of development and operation costs, and any other
information that is deemed material in the reasonable and good faith judgment of
the other Party. The Party giving notice may request a reasonably detailed
reply, including the other Party's anticipated impact of the problem, (if
applicable) estimates of development and operation costs, and any other
information that is deemed material in the reasonable and good faith judgment of
the notifying Party. In the event the

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refraining by a Party from the obligation substantially affects the value of the
entire Nasdaq Application or makes performance of the Agreement as a whole not
commercially practicable, the other Party may terminate the Agreement, the
Parties may refrain from such obligation, but neither Party may seek damages
against the other Party.

       10.6.  SECURITY. Nasdaq's security procedures are subject to regulatory
oversight of the SEC (or other body with regulatory or oversight jurisdiction
over any part of the Nasdaq Family). OptiMark shall develop and employ
reasonable system and other security procedures and systems respecting the
OptiMark portion of the Nasdaq Application for which it is responsible
(including the OptiMark Matching Module). Nasdaq shall develop and employ system
and other security procedures and systems respecting the Nasdaq portion of the
Nasdaq Application for which it is responsible, consistent with the system and
other security procedures that Nasdaq utilizes for other electronic trading
systems made available through the same Complex or as stated in the
Specifications. In addition, the Parties shall develop and employ reasonable
system and other security procedures and systems respecting the Nasdaq Data
Center where the OptiMark Matching Module will be housed, as provided in the
Specifications.

SECTION 11.  OWNERSHIP AND LICENSES

       11.1.  OWNERSHIP. The development and implementation of the Nasdaq
Application shall not result in a joint venture or joint works of the Parties
(or their respective Affiliates). All software, systems and capabilities
required to operate the Nasdaq Application and all Intellectual Property rights
therein, shall remain the sole and exclusive property of the Party developing
them (or of their licensors and suppliers) regardless of any asserted
contribution of knowledge or information by the other Party, and unless
permitted by Sections 16.2 or 16.3, shall not be sold, revealed, disclosed or
otherwise communicated directly or indirectly, by the other Party to any Person
other than as set forth herein. It is expressly understood that no title to or
ownership of the property owned or being developed by either Party is hereby
transferred to the other Party. As to the Specifications, OptiMark shall own the
portion of the Specifications that deals with the OptiMark portion of the Nasdaq
Application or the OptiMark Technology and Nasdaq shall own the portion of the
Specifications that deals with the Nasdaq portion of the Nasdaq Application or
the Nasdaq Technology regardless of any asserted contribution of knowledge or
information by the other Party, and unless permitted by Sections 16.2 or 16.3,
shall not be sold, revealed, disclosed or otherwise communicated directly or
indirectly, by the other Party to any Person other than as set forth herein.

       11.2.  INTELLECTUAL PROPERTY. Nothing in the Agreement shall be deemed to
grant a Party the right to use the other Party's names, trade marks, service
marks, or other Intellectual Property rights without written consent unless
specifically provided herein.

       11.3.  LICENSES. Each Party agrees that it will grant, as to its portion
of the Nasdaq Application, any Intellectual Property or other rights, on a
non-exclusive basis, necessary for the Parties or other authorized Persons to
perform their obligations under

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this Agreement. Anything herein to the contrary notwithstanding, neither Party
shall be restricted (except for any use of Confidential Information subject to
the Confidential Information Exchange Agreement) in using ideas, concepts,
know-how, trade secrets and techniques that result from the development of the
Nasdaq Application and are related to network management and electronic
securities trading; provided, however, that such use does not infringe the valid
patents or copyrights of the disclosing Party.

       11.4.  ON-SITE VISITS. During the Specifications Phase, OptiMark shall
authorize a reasonable number of on-site visits by the Nasdaq staff at a time
and place agreed by the Parties to observe the operation and/or testing of the
PCX Application.

       11.5.  NASDAQ DUE DILIGENCE. OptiMark (unless it has already recently
done so) shall provide Nasdaq all documents and schedules (including recent
financial and income statements) provided or referenced at a recent significant
closing with investors (satisfactory to Nasdaq).

       11.6   REMEDIAL ACTIONS. In the event that: (a) an Intellectual Property
or other Claim is asserted by a third party against a Party's (including the
OptiMark Family, the Nasdaq Family, and any other authorized Person) permitted
use of the Nasdaq Application or (b) a Party discovers the facts that are likely
to give rise to such Claim, the Party whose Intellectual Property or other right
is affected will use its Best Efforts to either: (i) obtain a license from the
third party for the Parties or authorized Persons to continue using the Nasdaq
Application and/or (ii) modify the Nasdaq Application to avoid such
infringement, and use its Best Efforts to complete such modifications. The
Parties agree that in event that the foregoing in the clauses (i) and (ii)
cannot be accomplished, then they will follow the provisions set forth in
Section 10.5.2, but must continue their indemnification obligations.

SECTION 12.  END-USERS AND DESIGNATED BROKERS

       12.1.  END-USERS; DESIGNATED BROKERS. The Nasdaq Application shall be
available, subject to the Standard Agreements, to (i) Member End-Users which are
Nasdaq Workstation subscribers and, (ii) through Members to non-Member End-Users
such as institutional investors and other non-Member broker-dealers. Member
End-Users shall have access to the Nasdaq Application and shall accept
regulatory responsibility for all Profiles, orders and transactions resulting
from the Nasdaq Application in their own or customer accounts. Non-Member
End-Users shall be required to designate in advance one or more Members as
designated brokers ("Designated Brokers") who shall authorize their access to
the Nasdaq Application and accept regulatory responsibility for the Profiles,
orders and transactions of such non-Member submitted and resulting from the
Nasdaq Application. Consistent with NASD Rules on this matter, Designated
Brokers shall authorize OptiMark to handle on their behalf the Profiles, orders
and transactions of their non-Member customers and to report to Nasdaq's systems
the transactions and related information for clearing and settlement, on behalf
of the Designated Brokers and in their name.

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       12.2.  CONTRACTS. (a) Prior to the Operational Commencement Date, there
shall be at least one or more of the following standard agreements (the
"Standard Agreements"): (i) a User Agreement (a "User Agreement") between
OptiMark and each End-User; (ii) a Designated-Broker Consent Agreement (a
"Designated Broker Consent Agreement") between OptiMark and each Designated
Broker and (iii), if appropriate, a Supplemental Account Agreement (a
"Supplemental Account Agreement" between each non-Member End-User and each of
its Designated Broker(s). Any modification of a Standard Agreement shall be
considered a Standard Agreement.

       (b)    Nasdaq shall be provided with a reasonable prior opportunity to
review each Standard Agreement. Each appropriate Standard Agreement shall
include terms stipulating that (i) a Party (which as used throughout the
remainder of this paragraph (b) is meant to include any of the entire NASD
Family or the OptiMark Family) shall be responsible to an End-User for direct
loss or damage resulting from an order which is executed on terms different to
those specified in the Profile which the End-User submits if, and only to the
extent that, the loss or damage is a result of such Party's gross negligence or
willful misconduct and is evidenced by contemporaneous printouts provided by the
End-User and confirmed by such Party's own computer printouts; and that (ii) a
Party shall not be responsible for any such loss or damage incurred by an
End-User that could have been avoided or mitigated if the End-User had promptly
reported the error to the relevant control center and/or had traded out of the
error.

       (c)    If, after its review of a Standard Agreement, Nasdaq does not
believe that the terms of such agreements adequately address reasonable
commercial or regulatory requirements that are consistent with Nasdaq's duties
as a part of an SRO, Nasdaq shall communicate such concerns promptly to
OptiMark, and shall attempt to jointly develop terms that address such concerns.
If the Parties cannot agree to new terms for the Standard Agreements, the
Parties shall handle the matter through the ADR and Arbitration Provisions, and
OptiMark shall indemnify and hold the NASD Family harmless against any claim or
losses that occur during the pendency of the procedures and that were the
subject of Nasdaq's concerns. Nasdaq shall complete its initial review of the
version of Standard Agreement that exists on the Effective date and notify
OptiMark of any concerns by the SEC Rule Filing Critical Milestone Date.

       12.3.  PROCEEDINGS UNDER THE STANDARD AGREEMENTS. OptiMark agrees to
cooperate (at OptiMark's expense) with Nasdaq in any SEC or other regulatory or
government proceeding involving Nasdaq arising out of or related to the Standard
Agreements and, as reasonably necessary, OptiMark shall alter any of the
Standard Agreements (subject to Section 10.5) or revise enforcement thereof
(after which, OptiMark may invoke Section 10.5) in the same manner as Nasdaq
would be required to do in order to comply with any order or ruling issued in
any such proceeding.

       12.4.  TRADING LIMITS. The Parties shall develop and implement the
capability for Designated Brokers to establish and update trading authority
limits for each of their

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non-Member customers and to advise such customers that a specified percentage of
that limit has been reached.

SECTION 13. JOINT TRAINING AND EDUCATION EFFORTS. The Parties shall commit to
undertake joint training and educational efforts as follows:

       (a)    Trader Forums. The Parties shall conduct at least ten trader
forums around the United States to familiarize sell-side traders with the Nasdaq
Application and to help make the new facility widely understood and accessible,
using mutually agreed upon materials.

       (b)    OptiMark Institutes. The Parties shall co-sponsor one or more
OptiMark Institute presentations at such times as agreed to by the Parties.

       (c)    Firm Support. The Parties shall commit a support team to provide
individual firm support regarding use of the Nasdaq Application.

       (d)    WEB Information. OptiMark shall provide a tutorial on the Nasdaq
Application, subject to Nasdaq approval, which Nasdaq shall place on at least
one of its relevant web site(s).

       (e)    Customer Interaction. Nasdaq shall hold periodic meetings with
OptiMark to discuss and to coordinate training for End-Users related to the
Nasdaq Application.

       (f)    Advance Notice of Third Party Contacts. Nasdaq agrees to give
notice to OptiMark prior to the Nasdaq Family entering into any agreement with a
market outside the United States that would permit that market or its members
access to the Nasdaq Application. OptiMark agrees to give notice to Nasdaq prior
to the OptiMark Family entering into any agreement with any Person to give
access to or supply an OptiMark Family Complex that would permit that Person or
its members access to the ability to trade Nasdaq Securities.

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SECTION 14.  FEES.

       14.1   OVERVIEW. Nasdaq shall file a fee schedule with the SEC for the
Nasdaq Application and shall share such fees with OptiMark as agreed to by the
Parties. As of the Effective Date, the Parties agree that the standard fee for
execution of shares through the Nasdaq Application shall be $.01 per share,
provided that such fee shall be discounted as set forth in subsections 14.2,
14.3(a) and 14.4, below. Revenue from the standard and discounted fees shall be
apportioned between OptiMark and Nasdaq as described in subsections 14.2, 14.3,
and 14.4. Notwithstanding the apportionment described in such subsections,
Nasdaq agrees to the following temporary revenue sharing arrangement to assist
OptiMark in recovering its costs associated with its First Stage purchase of
Tandem Computers (or a substituted make or type) for the OptiMark Matching
Module. For executed orders as a result of Profiles described in subsection
14.3(a) and (b) below, Nasdaq shall share with OptiMark: (a) none of the Nasdaq
Service Fee for the first 10 million shares per day so executed; (b) 50% of the
Nasdaq Service Fee for the next 5 million shares per day so executed; and (c)
75% of the Nasdaq Service Fee for the next 10 million shares per day so executed
until such time that the total amount of extra revenue paid to OptiMark as a
result of this special revenue sharing arrangement reaches the Rebate Cap, at
which time the normal revenue sharing arrangement shall be followed.

       14.2   EXECUTIONS FROM THE BBO. There shall be no fee shared with
OptiMark for executions of the first 30 million shares per day resulting from
matches with the BBO or the Nasdaq Quote Montage.

       14.3.  PROFILES AND ORDERS FROM NASDAQ WORKSTATIONS AND OTHER NETWORKS

       (a)    Discounted Fee Profiles - OptiMark Share of Revenue. Profiles that
are transmitted by Members through the EWN or VPN from the Nasdaq Workstation
and that are for 10,000 shares or less for Nasdaq's Largest Capitalized Stock,
and for 5,000 shares or less for all other Nasdaq Securities, which Profiles
result in trades that do not receive any Price Improvement in the OptiMark
Matching Module, shall be charged by Nasdaq, on behalf of OptiMark, at a rate of
$0.0025 per share traded.

       (b)    Other Profiles - OptiMark share of Revenue. Except as specified in
Section 14.3(a), all executions reported through the Nasdaq Application
(including trades by End-Users that are not NASD members or that use networks
other than those provided by Nasdaq to submit Profiles for participation in a
Call) shall be charged by Nasdaq, on behalf of OptiMark, at a rate of $0.009 per
share traded.

       14.4.  NASDAQ SERVICE FEE. Nasdaq shall have the right to charge as a fee
$0.001 per share traded or such other amount as agreed to by the Parties (the
"Nasdaq Service Fee") for all executions reported through the Nasdaq Application
(including trades by End-Users that are not NASD members or that use networks
other than those provided by Nasdaq to submit Profiles for participation in a
Call) as a means for Nasdaq to cover its

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operating and capital costs related to or arising from the Nasdaq Application.
The Nasdaq Service Fee shall be discounted for those trades referred to in
Section 14.3(a) at the same proportion as specified therein. In addition, if the
Parties agree to allow Profiles in listed securities to flow through the Nasdaq
Application or the Nasdaq Technology, Nasdaq may assess a reasonable amount of
service charge for permitting such Profiles in listed securities to be delivered
to other OptiMark applications. Where the Profile flows through an OptiMark
provided network or terminal program but does not use any of the Nasdaq
Technology to trade the listed securities, the above fee does not apply.

       14.5   COMPETITIVE FEES. The Parties shall review fees under Sections
14.3 and 14.4 prior to the Operational Commencement Date and, periodically
thereafter determine whether such fees reflect competitive market conditions.

       14.6.  BILLING FOR NASDAQ APPLICATION. Nasdaq shall bill End-Users a
Nasdaq Application fee for all executions reported through the Nasdaq
Application (including trades by End-Users that are not NASD members or that use
networks other than those provided by Nasdaq to submit Profiles for
participation in a Call). Nasdaq shall use the same efforts to produce and
collect the Nasdaq Application fee that it uses to produce and collect the bills
for other trading services that it makes available. Upon payment of the bill,
Nasdaq shall within 30 Days remit the OptiMark fees to OptiMark. Partial payment
of a bill by an End User shall be split pro rata between the Parties.

       14.7.  MONITORING. The Parties agree that use of a discounted fee related
to the Nasdaq Application for Members could provide an incentive for certain
non-Member End-Users to direct Profiles to Members to obtain the discounted fee.
Nasdaq shall monitor trading to identify Members that may be using the EWN or
VPN strictly as a conduit to the OptiMark Matching Module to provide
institutional customers a reduced fee. Nasdaq shall use its best efforts to
cause to be filed rule filings that Nasdaq reasonably believes will help prevent
this activity and diligently work to obtain requisite regulatory approval of
such rule filings.

SECTION 15.  REPRESENTATIONS AND WARRANTIES.

       15.1.  [LEFT BLANK].

       15.2.  EXCLUSION OF IMPLIED WARRANTIES. These warranties are exclusive
and expressly in lieu of all other warranties, express or implied, including any
warranty of merchantability or fitness for a particular purpose.

       15.3.  REPRESENTATIONS AND WARRANTIES OF OPTIMARK. OptiMark hereby
represents and warrants to Nasdaq as follows:

       (a)    Corporate Status. It is (i) a duly organized and validly existing
corporation in good standing under the laws of the jurisdiction of its
organization and has the corporate power and authority to own its property and
assets and to transact the

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business in which it is engaged and presently proposes to engage and (ii) has
duly qualified and is authorized to do business and is in good standing in all
jurisdictions where it is required to be so qualified except where the failure
to be so qualified would not have a Material Adverse Effect.

       (b)    Corporate Power and Authority. It has the corporate power and
authority to execute, deliver and carry out the terms and provisions of this
Agreement and has taken all necessary corporate action to authorize the
execution, delivery and performance of this Agreement.

       (c)    Authority. It has duly executed and delivered this Agreement and
this Agreement constitutes the legal, valid and binding obligation of OptiMark,
enforceable against OptiMark in accordance with its terms except to the extent
that the enforceability thereof may be limited by applicable bankruptcy,
insolvency, reorganization or other similar laws affecting creditors' rights
generally and by general equitable principles (regardless of whether the issue
of enforceability is considered in a proceeding in equity or at law).

       (d)    No Violation. Except as otherwise provided in subsection (e),
neither the execution, delivery and performance by OptiMark of this Agreement
nor compliance by OptiMark with the terms and provisions hereof (i) will
contravene any applicable provision of any law, statute, rule, regulation,
order, writ, injunction or decree of any court or governmental instrumentality,
(ii) will conflict or be inconsistent with or result in any breach of any of the
terms, covenants, conditions or provisions of, or constitute a default under, or
result in the creation or imposition of (or the obligation to create or impose)
any lien upon any of the property or assets of OptiMark pursuant to the terms of
any material indenture, mortgage, deed of trust, agreement or other material
instrument to which OptiMark is a party or by which it or any of its property or
assets are bound or to which it may be subject or (iii) will violate any
provision of the certificate of incorporation or by-laws of OptiMark.

       (e)    Intellectual Property, etc. To the best of OptiMark's knowledge,
it owns or has sufficient right to use all of its material licenses and other
Intellectual Property and any other necessary rights, free from restrictions,
that are necessary for the operation of the Nasdaq Application under this
Agreement or could have a Material Adverse Effect.

       (f)    Compliance with Statutes. It is in compliance with all applicable
statutes, regulations, and orders of, and all applicable restrictions imposed by
all governmental bodies, domestic or foreign, in respect of the conduct of its
business and the ownership of its property (other than Intellectual Property),
except such noncompliance as is not reasonably likely to, in the aggregate, have
a Material Adverse Effect.

       (g)    Ownership. It owns and possesses all rights and interests
necessary to enter into, and perform its obligations under, this Agreement and
has the right to grant to

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Nasdaq the rights set forth herein in OptiMark's Intellectual Property to the
Nasdaq Application.

       15.4.  REPRESENTATION AND WARRANTIES OF NASDAQ. Nasdaq hereby represents
and warrants to OptiMark that:

       (a)    Corporate Status. It is (i) a duly organized and validly existing
corporation in good standing under the laws of the jurisdiction of its
organization or formation and has the corporate power and authority to own its
property and assets and to transact the business in which it is engaged and
presently proposes to engage and (ii) has duly qualified and is authorized to do
business and is in good standing in all jurisdictions where it is required to be
so qualified except where the failure to be so qualified would not have a
Material Adverse Effect.

       (b)    Corporate Power and Authority. It has the corporate power and
authority to execute, deliver and carry out the terms and provisions of this
Agreement and has taken all necessary corporate action to authorize the
execution, delivery and performance of this Agreement.

       (c)    Authority. It has duly executed and delivered this Agreement and
this Agreement constitutes the legal, valid and binding obligation of Nasdaq
enforceable against Nasdaq in accordance with its terms except to the extent
that the enforceability thereof may be limited by applicable bankruptcy,
insolvency, reorganization or other similar laws affecting creditors' rights
generally and by general equitable principles (regardless of whether the issue
of enforceability is considered in a proceeding in equity or at law).

       (d)    No Violation. Except as otherwise provided in subsection (e),
neither the execution, delivery and performance by Nasdaq of this Agreement nor
compliance by Nasdaq with the terms and provisions hereof (i) will contravene
any applicable provision of any law, statute, rule, regulation, order, writ,
injunction or decree of any court or governmental instrumentality, (ii) will
conflict or be inconsistent with or result in any breach of any of the terms,
covenants, conditions or provisions of, or constitute a default under, or result
in the creation or imposition of (or the obligation to create or impose) any
lien upon any of the property or assets of Nasdaq pursuant to the terms of any
material indenture, mortgage, deed of trust, agreement or other material
instrument to which Nasdaq is a party or by which it or any of its property or
assets are bound or to which it may be subject or (iii) will violate any
provision of the certificate of incorporation or by-laws of Nasdaq.

       (e)    Intellectual Property, etc. To the best of Nasdaq's knowledge, it
owns or has sufficient right to use all of its material Intellectual Property,
licenses and other rights, free from restrictions, that are necessary for the
operation of the Nasdaq Application under this Agreement or that affects the
ability to effect and process a transaction resulting from a Call.

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       (f)    Compliance with Statutes. It is in compliance with all applicable
statutes, regulations, and orders of, and all applicable restrictions imposed by
all governmental bodies, domestic or foreign (other than Intellectual Property)
that affects the ability to effect and process a transaction resulting from a
Call

       (g)    Ownership. It owns and possesses all rights and interests
necessary to enter into, and perform its obligations under, this Agreement and
has the right to grant to OptiMark the rights set forth herein.

SECTION 16.  CONFIDENTIAL INFORMATION.

       16.1.  CONFIDENTIALITY OF TRADING INFORMATION. The Parties and their
employees, agents, contractors and consultants shall at all times treat in
strictest confidence all information and data of whatsoever nature received from
the OptiMark Family, the Nasdaq Family, a broker or dealer, or End-Users in
connection with any Profiles or trades (including orders, trades, positions,
trade limits and other trading information) in the course of operating the
Nasdaq Application. The Parties shall comply with the confidentiality
obligations as set forth in the Standard Agreements. Nothing in this Agreement
or a Standard Agreement is intended to prevent the Parties (including the Nasdaq
Family) from disclosing or using such confidential information in its regulatory
capacity, where required by law or regulation, or pursuant to a request of a
regulatory body (such as NASD Regulation and other members of the Nasdaq Family,
the SEC, or other body with regulatory or oversight jurisdiction over a Party or
any part of the Nasdaq Family). OptiMark shall create and maintain an
appropriate audit trail and other regulatory information related to the Nasdaq
Application and shall provide the Nasdaq Family with access to such information
on the same basis as if OptiMark were a Member.

       16.2.  NON-CONFIDENTIAL INFORMATION. No Party shall be obligated
hereunder to maintain in confidence information that (i) was published or
otherwise available in the industry at the time of disclosure to that Person by
the other Party; (ii) became generally available in the industry, prior to that
Person's unauthorized use of disclosure, other than by breach of an agreement
with the other Party; (iii) was acquired by that Person from a third party who
did not acquire it under a confidential relationship directly or indirectly from
the other Party hereto; or (iv) was in that Person's possession prior to the
time it was disclosed to it by the other Party.

       16.3.  CONFIDENTIAL EXCHANGE INFORMATION AGREEMENT. The Parties hereby
agree that any proprietary and confidential information disclosed under this
Agreement by or under authorization of the OptiMark Family, or a broker or
dealer, to the Nasdaq Family or by or under authorization of the Nasdaq Family,
or a broker or dealer, to the OptiMark Family (including information relating to
any End-User) shall continue to be governed by the terms of that certain
Confidential Information Exchange Agreement (the "Exchange Agreement") made as
of November 12, 1997. The Parties hereby agree to amend the Exchange Agreement
as appropriate to ensure that the confidentiality

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provisions therein shall apply to all disclosures of proprietary and
confidential information made under this Agreement.

SECTION 17.  DEFAULT.

       An occurrence of any of the following specified events shall be a default
(each an "Event of Default") hereunder:

       17.1.  MATERIAL BREACH. Either Party shall breach any material provision
of this Agreement. Any representation or warranty made by OptiMark or Nasdaq in
this Agreement or in any deliverables hereunder shall prove to be untrue in any
material respect on the date as of which made or deemed made or becomes untrue
thereafter. In addition, an Event of Default hereunder also shall include (i) a
Party's failure to complete the tasks identified in Schedule II within the
specified time frame, resulting in the failure to meet a Critical Milestone Date
by more than 30 Days and (ii) a Party's failure to correct any malfunction,
defect or non-conformity in that Party's respective portion of the Nasdaq
Application (including the OptiMark Matching Module), resulting in the Nasdaq
Application's failure to materially function in accordance with the applicable
Specifications on more than three (3) occasions in a one-year period.

       17.2.  DUE DILIGENCE BY NASDAQ. The result of the due diligence by Nasdaq
under the Warrant Agreement shall show a Material Adverse Effect or a material
risk of inability of OptiMark to perform its obligations hereunder. Nasdaq shall
notify OptiMark of a breach of this provision within 60 Days of receiving the
applicable due diligence materials.

       17.3.  BANKRUPTCY AND INSOLVENCY. OptiMark or Nasdaq shall commence a
voluntary case concerning itself under Title 11 of the United States Code
entitled "Bankruptcy," as now or hereafter in effect, or any successor thereto
(the "Bankruptcy Code"); or an involuntary case is commenced against OptiMark or
Nasdaq and the petition is not controverted within 10 Business Days, or is not
dismissed within 60 Days, after commencement of the case; or a custodian (as
defined in the Bankruptcy Code) is appointed for, or takes charge of, all or
substantially all of the property of OptiMark or Nasdaq, as the case may be; or
OptiMark or Nasdaq commences any other proceeding under any reorganization
arrangement, adjustment of debt, relief of debtors, dissolution, insolvency or
liquidation or similar law of any jurisdiction whether now or hereafter in
effect relating to OptiMark or Nasdaq as the case may be, or there is commenced
against OptiMark or Nasdaq any such proceeding which remains undismissed for a
period of 60 Days; or OptiMark or Nasdaq is adjudicated insolvent or bankrupt;
or any order of relief or other order approving any such case or proceeding is
entered; or OptiMark or Nasdaq suffers any appointment of any custodian or the
like for it or any substantial part of its property to continue undischarged or
unstayed for a period of 60 Days; or OptiMark or Nasdaq makes a general
assignment for the benefit of creditors; or any corporate action is taken by
OptiMark or Nasdaq for the purpose of effecting any of the foregoing.

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       17.4.  CROSS DEFAULT. There shall occur a material breach of any
provision of, or a default under, the Warrant Agreement, which breach or default
is not properly cured or remedied in the time frame and manner set forth in the
Warrant Agreement.

SECTION 18.  TERM AND TERMINATION.

       18.1.  TERM. The term of this Agreement shall commence on the Effective
Date and shall continue until Termination shall have occurred.

       18.2.  EVENTS OF TERMINATION. Except as expressly provided otherwise
herein, this Agreement shall terminate as follows (any such termination, an
"Event of Termination"):

       (a)    Default. Upon the occurrence of an Event of Default under Section
17.1-17.2, the non-defaulting Party may terminate this Agreement by providing 30
Days' prior written notice to the defaulting Party with the right to cure within
such period. In the case of a default under Section 4.3 (related to Nasdaq QC
Tests) or the remainder of Section 17, the written notice need not give a notice
period with a right to cure. Any such notice shall specify the nature of the
event or occurrence giving rise to such termination.

       (b)    Mutual Agreement. This Agreement may be terminated at any time
upon mutual agreement of the Parties in writing.

       (c)    Force Majeure. An event of Force Majeure shall have occurred and
the effect of such event shall be continuing for more than 10 Days and such
event shall continue for a period of 10 additional Days after the giving of
written notice thereof by either Party. If termination is sought by the Party
affected by the Force Majeure, it must exercise its Best Efforts to avoid the
effect of the Force Majeure for the entire 20 day period.

       (d)    Failure to Obtain Regulatory Approval. Nasdaq shall have failed to
receive Regulatory Approval by the Critical Milestone Date and such failure
shall continue for a period of at least 30 Days or such longer period as agreed
to by the Parties, after which period either Party may give written notice of
termination of the Agreement to the other Party.

       (e)    Persistent Low Trading Volumes. At any time after the Nasdaq
Application has been operating for a period of three years, and the gross
collected revenues under this Agreement shall be less than an average of
$500,000 per month over the preceding 12-month period, after which period either
Party may give 60 Days written notice of termination of the Agreement to the
other Party.

       (f)    Market Integrity Reasons. This Agreement may be terminated by
Nasdaq if an event or circumstance occurs under which the OptiMark Matching
Module or the Nasdaq Application as a whole threatens or Nasdaq reasonably
believes it threatens the

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effective and orderly operation of the Nasdaq Stock Market, and such threat
remains uncured for a period of at least 30 Days or such other period as the
Parties shall agree to, after which period Nasdaq may give written notice of
termination of the Agreement.

       (g)    OptiMark Change of Control. This Agreement may be terminated by
Nasdaq if a Change of Control shall have occurred in respect of OptiMark and
shall continue for a minimum period of 30 Days after written notice from Nasdaq,
after which period Nasdaq may give written notice of its intent to terminate the
Agreement.

       (h)    Nasdaq Change of Control. This Agreement may be terminated by
OptiMark if a Change of Control shall have occurred in respect of Nasdaq and
shall continue for a minimum period of 30 Days after written notice from
OptiMark, after which period OptiMark may give written notice of termination of
the Agreement.

       18.3.  PROPERTY OF THE PARTIES. Upon termination: (i) each Party shall
promptly return to the other Party all papers, materials and other properties of
the other held for purposes of this Agreement; and (ii) each Party shall assist
the other Party in the orderly termination of this Agreement so as to ensure, to
the greatest extent possible, for the orderly, non-disrupted shutdown of the
Nasdaq Application, subject to Section 19.

       18.4.  PRE-OPERATIONAL DAMAGES. If an Event of Termination shall occur
prior to the Operational Commencement Date as a result of an Event of Default
under Section 17, the defaulting Party shall pay, as the exclusive remedy, the
out-of-pocket expenses reasonably incurred by the non-defaulting Party in the
course of discharging its obligations under this Agreement, up to $5 million.

SECTION 19. NASDAQ'S RIGHTS UPON CERTAIN EVENTS OF TERMINATION. If an Event of
Termination shall occur after the Operational Commencement Date, in addition to
any damages or injunctive relief as may be awarded, Nasdaq shall have a license
to use the OptiMark portion of the Nasdaq Application and a license under
OptiMark's Intellectual Property of sufficient scope over the OptiMark
Technology (including the OptiMark Matching Module) to permit Nasdaq to operate,
support, and maintain the Nasdaq Application as a facility of the Nasdaq Market
until such time as Nasdaq is able in a commercially reasonable time frame to
receive any requisite permission from the SEC (and all other necessary bodies
with regulatory or oversight jurisdiction over any part of the Nasdaq Family) to
cease operation of the Nasdaq Application, provided that Nasdaq pays a
reasonable royalty to OptiMark. If the Parties cannot agree on a rate, the rate
shall be set in accordance with the ADR and Arbitration Provisions of this
Agreement. If the Event of Termination is not the result of an Event of Default
by OptiMark, Nasdaq shall use its Best Efforts to file and work to obtain any
requisite permission from the SEC (and other necessary bodies with regulatory or
oversight jurisdiction over any part of the Nasdaq Family) to cease operation of
the Nasdaq Application immediately thereafter; OptiMark shall use its Best
Efforts to support the approval of the Rule Filing.

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SECTION 20.  INDEMNIFICATION

       20.1.  MUTUAL INDEMNITY. Each Party (the "Indemnifying Party") shall
indemnify the other Party and such other Party's respective Affiliates,
directors, officers, employees, contractors, and agents (each an "Indemnified
Party" and collectively the "Indemnified Parties") and hold them harmless from
and against any and all claims, causes of action, liabilities, damages and
related costs of investigation and enforcement (including reasonable attorney's
fees) ("Losses") incurred or suffered by any Indemnified Party arising out of:
(a) any material breach of the confidentiality provisions of this Agreement; (b)
any failure of any representation or warranty made by the Indemnifying Party
pursuant to this Agreement to be true and correct in any material respect on the
date made or deemed to be made or shall become untrue in any material respect at
any time thereafter; (c) injury or damage to any Person or tangible property; or
(d) any act or omission of gross negligence or willful tortuous misconduct of
the Indemnifying Party in performance of any of its duties hereunder. The
Parties agree that with respect to any Losses arising out of the clause (b) of
this subsection, the representations and warranties made under subsections
15.3(e) and 15.4(e) of this Agreement are made, and shall be deemed to be made,
only as of the Effective Date. The Parties further agree that with respect to
any Intellectual Property or other Claim by a third party based on the
Indemnified Party's permitted use of the Nasdaq Application, the Indemnifying
Party shall indemnify the Indemnified Party as set forth in the otherwise
applicable provisions of this Section 20.

       20.2.  INDEMNIFICATION PROCEDURE. (a) The Indemnified Party shall
promptly notify the Indemnifying Party of the existence of any claim, demand,
action, proceeding or other matter pursuant to this Agreement (the "Claim"),
setting forth in reasonable detail the facts and circumstances pertaining
thereto and the basis for the Indemnified Party's right to indemnification. Such
notification shall be given in accordance with Section 24.5 of this Agreement.

       (b)    If any third party shall assert any claim against any Indemnified
Party which may give rise to a Claim for indemnification against the
Indemnifying Party under this Agreement, (a "Third Party Claim") then the
Indemnified Party shall promptly notify the Indemnifying Party thereof;
provided, however, that no delay on the part of the Indemnified Party in
notifying the Indemnifying Party of any Third Party Claim shall relieve the
Indemnifying Party from any liability or obligation hereunder unless (and then
solely to the extent) the Indemnifying Party thereby is materially prejudiced by
such failure to give notice. In the event that any Indemnified Party shall give
notice to any Indemnifying Party of a Third Party Claim, the Indemnifying Party
may assume the defense thereof by giving notice to the Indemnified Party within
thirty (30) Days of receipt from the Indemnified Party of such Third Party Claim
in which case:

       (i)    the Indemnifying Party will defend the Indemnified Party against
such Third Party Claim with counsel of its choice reasonably satisfactory to the
Indemnified Party;

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       (ii)   the Indemnified Party may retain separate co-counsel at its sole
cost and expense to represent it in the defense of such Third Party Claim,
except that the Indemnifying Party will be responsible for the fees and expenses
of the separate co-counsel (a) to the extent the Indemnified Party concludes
reasonably based upon advice of counsel that a conflict of interest exists
between the Indemnified Party and Indemnifying Party or (b) the named parties to
any such Third Party Claim (including any impleaded parties) include both such
Indemnified Party and the Indemnifying Party and such Indemnified Party shall
have been advised by counsel that there may be one or more legal defenses
available to the Indemnified Party which are not available to the Indemnifying
Party, or available to the Indemnifying Party, but the assertion of which would
be adverse to the interest of the Indemnified Party;

       (iii)  the Indemnified Party will not consent to the entry of any
judgment or enter into any settlement with respect to such Third Party Claim
without the written consent of the Indemnifying Party (not to be withheld
unreasonably); and

       (iv)   the Indemnifying Part will not consent to the entry of any
judgment or enter into any settlement with respect to such Third Party Claim
which does not include a provision whereby the plaintiff or claimant in such
matter releases the Indemnified Party from all liability with respect thereto,
without the written consent of the Indemnified Party (not to be withheld
unreasonably).

       (c)    If no Indemnifying Party notifies the Indemnified Party within 30
Days after the Indemnified Party has given notice of such Third Party Claim that
such Indemnifying Party is assuming the defense thereof, then the Indemnified
Party may defend against, or enter into any settlement with respect to, such
matter in any manner it reasonably may deem appropriate, without prejudice to
any of its rights hereunder.

       (d)    The Indemnified Party shall be entitled to reimbursement of
reasonable expenses included in Losses with respect to any Third Party Claim
noticed to the Indemnifying Party in accordance herewith (including, without
limitation, the cost of defense, preparation and investigation relating to such
Claim) as such expenses are incurred by the Indemnified Party.

       (e)    Notwithstanding the foregoing, the Indemnifying Party shall not be
liable for any Losses to the extent (i) caused by the Indemnified Party's gross
negligence, willful tortious misconduct, or violation of laws or rules
applicable to the Nasdaq Application or (ii) that the Indemnified Party is not
required to pay any damages under a Third Party Claim due to the Indemnified
Party's mitigation efforts or regulatory rules, or any contract between the
Indemnified Party and the third party. Neither Party shall be entitled to
recover its own consequential damages against the other Party, except for
willful tortious misconduct, gross negligence, and injury to personal or
tangible property.

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SECTION 21.  YEAR 2000/DECIMALIZATION COMPLIANCE.

       (a)    Nasdaq shall comply with its Year 2000 compliance program, and it
shall provide OptiMark with information concerning such program promptly upon
request. After the Operational Commencement Date, the Parties shall work
together to develop the capability for input, output, and processing of prices
to an appropriate number of decimal places as required by the SEC (or other body
with regulatory or oversight jurisdiction over any part of the Nasdaq Family).

       (b)    OptiMark shall provide all computer hardware and software systems
as required in connection with this Agreement or utilized by OptiMark to
discharge its obligations hereunder (including the OptiMark Matching Module)
that provide fault-free performance in the processing of dates and date related
data (including, but not limited to calculating, comparing and sequencing),
individually and in combination. Fault-free performance shall include the
manipulation of such data with dates prior to and through January 1, 2001, and
shall be transparent to Nasdaq and to End-Users ("Year 2000").

       (c)    In the event that Year 2000 errors are encountered, such error
shall be considered a critical error and OptiMark shall (i) respond within
twenty-four (24) hours with either a fix or a work around that corrects the
error; (ii) provide replacement software that corrects the error; or (iii)
provide a statement that the error is not being caused by OptiMark's hardware
and software systems.

SECTION 22.  DISPUTE RESOLUTION.

       22.1.  ALTERNATIVE DISPUTE RESOLUTION. Any and all disputes,
controversies, claims, or differences arising out of, relating to, or having any
connection with this Agreement as well as any other question relating to its
existence, validity, interpretation, performance, or termination, any functional
methodology disputes, one Party getting behind on a milestone or likely to get
behind on milestones, or testing, reliability or other operational concerns
(collectively, "Disputes") shall first be attempted to be resolved by the
Project Coordinators. If the Project Coordinators are unable to resolve any such
Dispute, then either Party may include such subject matter on the agenda of the
next Steering Committee meeting. If the Steering Committee fails to resolve such
Dispute at such meeting, either Party may demand a consultation on the Dispute
between senior officers of both Parties. If, within 10 Days thereafter, the
Parties have not met or are still unable to resolve the matter, either Party may
give an mediation notice to the other Party. Non-binding mediation be
administered by the American Arbitration Association ("AAA"), and shall be
conducted in accordance with the Commercial Mediation Rules of the American
Arbitration Association, as such may be amended from time to time. The mediation
shall be held in New York City or such a place as the Parties to the Parties to
the mediation proceeding shall otherwise agree in writing. The procedures in
this sub-section shall be referred to as "ADR".

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       22.2.  ARBITRATION. (a) Except where a section of this Agreement provides
only for ADR, any and all Disputes (after having been dealt with in accordance
with the provisions of Subsection 22.1) shall be exclusively resolved by binding
arbitration, which shall be administered by the American Arbitration Association
("AAA"), and shall be conducted in accordance with the Commercial Arbitration
Rules of the American Arbitration Association (the "Rules"), as such Rules may
be amended from time to time. The arbitration shall be held in New York City or
such a place as the Parties to the arbitration proceeding shall otherwise agree
in writing.

       (b)    Within 10 Days of receipt of the arbitration notice, the Parties
shall attempt in good faith to agree on a single neutral arbitrator, except
where the Parties agree that three arbitrators are needed given the relatively
large amount in controversy (generally expected to exceed $1,000,000.00) and the
complexity of the Dispute, in which case each Party shall select one person to
act as arbitrator and the two selected shall select a third arbitrator within 10
Days of their appointment. If the Parties do not agree on the number of
arbitrator(s) or do not agree on a single neutral arbitrator within the
specified time frame, the AAA shall use its normal procedures pursuant to the
Rules for selection of one or more arbitrators. The Parties agree that under all
circumstances, regardless of how many arbitrators are selected and who appoints
them, the selection of arbitrator(s) must be completed within 20 Days of receipt
of the arbitration notice.

       (c)    The decision or award of the arbitrator(s) shall be final, binding
and incontestable and may be used as a basis for judgment thereon in any
jurisdiction. The Parties hereby expressly agree to waive the right to appeal
(other than the grounds permitted under the Federal Arbitration Act) from the
decision of the arbitrator(s). Accordingly, there shall be no appeal to any
court or other authority (government or private) from the decision of the
arbitrator(s), and the Parties shall not dispute nor question the validity of
such decision or award before any regulatory or other authority in any
jurisdiction where enforcement action is taken by the Party in whose favor the
decision or award is rendered.

       (d)    The Parties shall cooperate with each other in causing the
arbitration to be held in as efficient and expeditious a manner as practicable
and in this connection to furnish such documents and make available such Persons
as the arbitrator(s) may request.

       (e)    The Parties have selected arbitration in order to expedite the
resolution of Disputes and to reduce the costs and burdens associated with
litigation. The Parties agree that the arbitrator(s) should take these concerns
into account when determining whether to authorize discovery and, if so, the
scope of permissible discovery and other hearing and pre-hearing procedures. The
arbitrator(s) shall render a written decision or an award within 90 Days after
the arbitration notice is provided, unless the Parties otherwise agree or the
arbitrator(s) makes a finding that a Party has carried the burden of showing
good cause for a longer period.

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       (f)    Without limiting any other remedies that may be available under
applicable law, the arbitrator(s) shall have no authority to award punitive
damages.

       (g)    Notwithstanding anything herein to the contrary, a Party may seek
a temporary restraining order or a preliminary injunction (including, without
limitation, to the extent available under the applicable law, a temporary
restraining order, preliminary injunction and/or pre- judgment attachment) from
any court of competent jurisdiction, without regard to any notice periods
required by the provisions of this Agreement (whether before, during or after
arbitration) and as often as is necessary or appropriate, in order to prevent
immediate and irreparable injury, loss, or damage to it or its Intellectual
Property on a provisional basis, pending the decision of the arbitrator(s) on
the ultimate merits of any Dispute.

       (h)    All proceedings and decisions of the arbitrator(s) shall be
maintained in confidence, to the extent legally permissible, and shall not be
made public by any party or any arbitrator(s) without the prior written consent
of all parties to the arbitration, except as may be required by law.

       (i)    Each Party shall bear its own costs and attorneys' fees, and the
Parties shall equally bear the fees, costs, and expenses of the arbitrator(s)
and the arbitration proceedings; provided, however, that the arbitrator(s) may
exercise discretion to award costs, but not attorneys' fees, to the prevailing
party.

       (j)    The commencement and pendency of an arbitration under this Section
shall not relieve any of the Parties of their respective obligations under this
Agreement. This sub-section shall not preclude a Party from suspending
performance of its obligations under this Agreement if otherwise permissible if
the matter has not been resolved within 30 Days after the date of the notice of
mediation under Section 22.1.

       (k)    The provisions set forth in this Subsection 22.2, shall be
referred to as "Arbitration." The Parties agree that the ADR and Arbitration
Provisions shall survive the termination and/or expiration of this Agreement.

SECTION 23. LITIGATION. A Party shall give prompt written notice to the other
Party if it knows of any pending or threatened actions, suits or proceedings or
of facts which would lead a reasonable person to believe that it would give rise
to such threats, with respect to: (1) OptiMark, that have, or are reasonably
likely to have: (i) a material and adverse affect on the Nasdaq Application,
(ii) a Material Adverse Effect or (iii) on the rights or remedies of Nasdaq or
on the ability of OptiMark to perform its obligations hereunder; (2) Nasdaq,
that have, or are reasonably likely to have: (i) a material and adverse affect
on the ability to effect and process a transaction resulting from a Call, (ii) a
Material Adverse Effect or (iii) on the rights or remedies of OptiMark or on the
ability of Nasdaq to perform its obligations hereunder. The existence of any of
the above may be treated as a Dispute by the other Party.

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SECTION 24.  MISCELLANEOUS MATTERS

       24.1.  INTEGRATION CLAUSE. This Agreement shall be the sole agreement
between the Parties regarding its subject matter, and shall merge and supersede
all prior oral and written communications and all contemporaneous oral
communications between the Parties regarding the same except those specifically
referenced herein.

       24.2.  WAIVER/ESTOPPEL CLAUSE. No delay or failure of either Party in
exercising any right hereunder and no partial or single exercise thereof, shall
be deemed of itself to constitute a waiver of such right or any other rights
hereunder.

       24.3.  AMENDMENT, MODIFICATION AND WAIVER. This Agreement may be amended,
modified or supplemented only by written agreement of the Parties. Except as
noted otherwise in this Agreement, the Specifications attached hereto may be
amended, modified or supplemented in writing by agreement of the Project
Coordinators. Either Party hereto may waive compliance by the other Party with
any term or provision hereof only by an instrument in writing. The waiver by
either Party hereto of a breach of any term or provision of this Agreement shall
not be construed as a waiver of any subsequent breach.

       24.4.  SEVERABILITY. Any provisions of this Agreement which is prohibited
or unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions hereof, and any such prohibition or
unenforceability in any jurisdiction shall not invalidate any other provision of
this Agreement in such jurisdiction or any other jurisdiction.

       24.5.  NOTICES. Any notice required to be in writing or notice of any
Dispute to be made hereunder shall be deemed to have been duly given upon actual
receipt by the person, or upon constructive receipt if sent by certified mail,
return receipt requested (at the earlier of the time the party signs the return
receipt or at the time of first refusal), or any other delivery method that
actually obtains a signed delivery receipt, when addressed to the person named
below to the following addresses or to such other address as any party hereto
shall hereafter specify by written notice to the other party or parties hereto:

              To Nasdaq:        The Nasdaq Stock Market, Inc.
                                Attention:  Alfred R. Berkeley, III
                                1735 K Street, N.W.
                                Washington, D.C.  20006
                                Tel:  (202) 728-8282
                                Fax:  (202) 728-8075

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With a required copy to:            Eugene A. Lopez, Esq.
                                    The Nasdaq Stock Market, Inc.
                                    1735 K Street, N.W.
                                    Washington, D.C.  20006
                                    Tel: (202) 728-6998
                                    Fax: (202) 728-8106

                 To OptiMark:       OptiMark Technologies, Inc.
                                    Attention:  Bill Lupien
                                    530 Main Avenue
                                    Durango, CO  81301
                                    Tel:  (970) 247-8800
                                    Fax:  (970) 247-8844

With a required copy to:            John Katovich, Esq.
                                    4347 Harbord Dr.
                                    Oakland, CA  94618
                                    Tel: (510) 594-2408

       24.6.  COMPLIANCE WITH LAWS. Each Party shall comply with the provision
of, and shall not cause the Nasdaq Application or the other Party (including any
of the Nasdaq Family or the OptiMark Family) to be in violation of, all
applicable foreign, federal, state, county and local laws, ordinances,
regulations, and codes including, but not limited to, each Party's obligations
as an employer with regard to the health, safety and payment of its employees,
and identification and procurement of required permits, certificates, approvals
and inspections in each Party's performance of this Agreement.

       24.7.  NO THIRD PARTY BENEFICIARIES. This Agreement shall inure to the
sole benefit of and be binding upon the Parties and their respective successors
and assigns. Nothing in this Agreement is intended or shall be construed to give
any other Person any legal or equitable right, remedy or claim under or in
respect of this Agreement or any provision contained herein.

       24.8.  MUTUAL LIMITATION OF LIABILITIES. Neither Party shall be entitled
to recover, and there shall be exclusion of, lost profits, lost opportunity,
trading losses, and consequential damages against the other Party (including the
NASD Family and the OptiMark Family) except for willful tortious misconduct,
gross negligence, and injury to Person or tangible property.

       24.9.  ASSIGNMENT. Absent the prior written consent of the other Party,
neither Party shall assign or otherwise transfer to any Person any of its rights
or obligations under this Agreement, except as expressly provided in this
Section. Nasdaq may assign its rights and obligation under this Agreement to any
of the Nasdaq Family without OptiMark's consent, in which case, Nasdaq shall
remain jointly and severally liable to OptiMark. Similarly, OptiMark may assign
its rights and obligation under this

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Agreement to any of the OptiMark Family without Nasdaq's consent, in which case,
OptiMark shall remain jointly and severally liable to Nasdaq. Any attempted
assignment in violation of this Section, and any other assignment which may
otherwise arise by operation of law, shall be void.

       24.10. GOVERNING LAW. This Agreement and the rights and obligations of
the Parties hereunder shall be construed in accordance with and be governed by
the law of the state of New York (without reference to the choice of law
provisions thereof). Subject to Section 22, any legal action or proceeding with
respect to this Agreement or may be brought exclusively in the courts of or for
the City of New York or of the United States for the Southern District of New
York, and, by execution and delivery of this Agreement, each Party hereby
irrevocably accepts for itself and in respect of its property, generally and
unconditionally, the jurisdiction of the aforesaid courts. Each Party hereby
further irrevocably waives any claim that any such courts lack jurisdiction over
such Party or that venue is not proper, and agrees not to plead or claim, in any
legal action or proceeding with respect to this Agreement brought in any of the
aforesaid courts, that any such court lacks jurisdiction over such Party or that
venue is not proper. Each Party irrevocably consents to the service of process
in any such action or proceeding by the mailing of copies thereof by written
notice. Each Party hereby irrevocably waives any objection to such service of
process and further irrevocably waives and agrees not to plead or claim in any
action or proceeding commenced hereunder that service of process was in any way
invalid or ineffective. Nothing herein shall affect the right of a Party to
serve process in any other manner permitted by law or to commence legal
proceedings or otherwise proceed against the other Party in any other
jurisdiction.

       24.11. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, and by the different Parties on separate counterparts, each of
which when so executed and delivered shall be an original, but all of which
together shall constitute but one and the same instrument. A complete set of
counterparts shall be lodged with each Party.

       24.12. SUCCESSORS. Except as otherwise provided herein, this Agreement,
together with all schedules or modifications now and hereafter made a part
hereof, shall be binding upon, and inure to the benefit of the Parties and their
permitted successors and assigns.

       24.13. HEADINGS. The headings of the various Sections herein are for
convenience of reference only and shall not define or limit any of the terms or
provisions hereof.

SECTION 25. DEFINITIONS [Comment: we need to check the cross references later].

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       "Affiliates" of any specified Person shall mean any other Person that
directly or indirectly controls, is controlled by, or is under common control
with such specified Person.

       "Agreement" shall have the meaning set forth in the first paragraph
hereof.

       "Automation Review Policies" shall mean the policies currently in effect
at the SEC regarding the SEC's review of self-regulatory organization's computer
capacity, security, contingency planning, and system audit procedures.

       "Bankruptcy Code" shall have the meaning provided in Section 17.3.

       "Best Efforts" means a standard of performance that involves more than
indifference to the other party's interests and requires more than a duty to
attempt to act with diligence to fulfill an obligation, but does not require a
party to disregard its own interests. Meeting a standard of best efforts may
require a party to incur losses to a reasonable extent for the benefit of the
other party and to exceed prevailing business practices, but does not require
the party to imperil its own existence or to make total efforts to fulfill the
obligation irrespective of all other considerations.

       "Business Day" shall mean for all purposes any day excluding Saturday,
Sunday and any day on which the Nasdaq Stock Market is closed.

       "Call" shall mean the central processing effected by the OptiMark
Matching Module in which Profiles are matched on a periodic basis according to
the algorithm software, resulting in orders of specified sizes and prices that
are capable of immediate execution.

       "Change of Control" in respect to OptiMark shall mean: (a) William A.
Lupien shall cease to be the chairman of OptiMark prior to the third anniversary
of the Operational Commencement Date, except where it is caused by death,
incapacity or health impairment; (b) all or substantially all of OptiMark's
assets shall be transferred to an ECN or another securities exchange or
association or a statutorily disqualified person in connection with any merger
or acquisition; or (c) a change of control that creates, or is likely to create,
a material competitive disadvantage to Nasdaq. "Change of Control" in respect to
Nasdaq shall mean: (a) Nasdaq shall cease to be an Affiliate of NASD; (b) all or
substantially all of Nasdaq's assets shall be transferred to an ECN or another
securities exchange or association or a statutorily disqualified person in
connection with any merger or acquisition; or (c) a change of control that
creates, or is likely to create, a material competitive disadvantage to
OptiMark. Whether a Party experiences or is likely to experience a material
competitive disadvantage will be raised as a Dispute under the ADR and
Arbitration Provisions of this Agreement.

       "Claim" shall have the meaning provided in Section 20.2.

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       "Complex" means computer hardware, software, communications networks,
systems, and communications interfaces.

       "Critical Milestone Dates" shall have the meaning provided in Section
2.2.

       "Day" means a calendar day.

       "Delivery" shall have the meaning provided in Section 4.2.

       "Designated Broker Consent Agreement shall have the meaning provided in
Section 12.2.

       "Designated Brokers" shall have the meaning provided in Section 12.1.

       "Development Phase" should have the meaning provided in Section 3.

       "ECN" shall mean an Electronic Communications Network that is linked to
Nasdaq's facilities under SEC Rule 11Ac1-1(c)(5)(ii) (known as the "ECN Display
Alternative" provision) of the Exchange Act.

       "End-User" shall mean a Person using a Nasdaq Workstation or other
terminal linked to the OptiMark Matching Module (including persons linked by
means of an OptiMark provided network) who submits Profiles.

       "Event of Default" shall have the meaning provided in Section 17.

       "Event of Termination" shall have the meaning provided in Section 18.2.

       "Exchange Act" shall have the meaning set forth in the first paragraph
hereof.

       "Force Majeure" shall mean such events including but not limited to Acts
of God, strikes, lockouts, riots, acts of war, epidemics, fire, communication
line failure, power failures, earthquakes or other disasters, if such is found
to be beyond the control of the Party; provided, however, that an event of Force
Majeure shall not include an action or inaction of the SEC (or other
governmental body having jurisdiction over any member of the Nasdaq Family).

       "Indemnified Party" shall have the meaning provided in Section 20.1.

       "Indemnifying Party" shall have the meaning provided in Section 20.1.

       "Installation and Acceptance Phase" shall have the meaning provided in
Section 4.1.

       "Installation Schedule" shall have the meaning provided in Section 4.1.

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       "Intellectual Property" shall mean domestic and foreign patents, patent
applications, registered and unregistered trade marks and service marks,
registered and unregistered copyrights, trade names, computer programs, data
bases, trade secrets, proprietary information and include all rights in
information created under laws governing patents, copyrights, mask works, trade
secrets, trademarks, publicity rights, or any other law that permits a person,
independently of contract, to control or preclude another person's use of the
information on the basis of the rights holder's interest in the information.

       "Largest Capitalized Stock" shall mean Nasdaq's 1000 largest capitalized
stocks within the prior calendar quarter.

       "Losses" shall have the meaning provided in Section 20.1.

       "Material Adverse Effect" shall mean a material adverse effect on the
business, property, assets, liabilities, operations, condition (financial or
otherwise) or prospects of a Party taken as a whole.

       "Member" shall mean a "member" of NASD within the meaning of Article I of
the By-Laws of the NASD.

       "Milestone Dates" shall have the meaning provided in Section 2.2.

       "NASD" shall have the meaning set forth in the first paragraph hereof.

       "NASD Regulation" shall mean the subsidiary of the NASD with
responsibilities for regulation of NASD members.

       "Nasdaq" shall have the meaning set forth in the first paragraph hereof.

       "Nasdaq Application" shall have the meaning provided in Section 1.1.

       "Nasdaq Data Center" shall mean Nasdaq's facility in Trumbull,
Connecticut or its successor(s) or replacement(s).

       "Nasdaq Family" shall mean Nasdaq and its Affiliates, collectively.

       "Nasdaq Letter" shall mean that certain letter, dated December 17, 1997,
from Richard G. Ketchum and Alfred R. Berkeley to William A. Lupien regarding
the exclusivity obligations of Nasdaq and OptiMark to each other.

       "Nasdaq Stock Market" shall have the meaning provided in Section 1.1.

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       "Nasdaq Quote Montage" shall mean the quotes, including orders and other
items which, pursuant to NASD Rules, are displayed with quotes in the Nasdaq
Workstation. A "Quote" shall mean an individual item within the Nasdaq Quote
Montage.

       "Nasdaq Securities" shall mean all securities listed on the Nasdaq Stock
Market.

       "Nasdaq Service Fee" shall have the meaning provided in Section 14.4.

       "Nasdaq Workstation" shall have the meaning provided in Section 1.4.

       "Nasdaq Workstation Presentation Device" shall mean a Nasdaq Workstation
Authorized Device (as that term is defined in the Nasdaq Workstation II
Subscriber Agreement or its successor(s)) which is a personal computer intended
for use by a single human End User.

       "Operational Phase" shall have the meaning provided in Section 5.1.

       "Operational Commencement Date" shall have the meaning provided in
Section 5.1.

       "OptiMark Family" shall mean OptiMark and its Affiliates, collectively.

       "OptiMark Institutes" shall mean the training sessions operated by
OptiMark personnel for the purpose of explaining to End-Users and broker-dealers
the operation of the OptiMark Matching Module as it works in the Nasdaq
Application.

       "OptiMark Matching Module" shall have the meaning provided in Section
1.1.

       "Parties" shall have the meaning provided in the first paragraph hereof.

       "Person" shall mean a natural person, corporation, partnership, limited
liability company, association or other governmental or non-governmental entity.

       "Phase" shall mean each of the Specification Phase, Development Phase,
Installation and Acceptance Phase and Operational Phase.

       "Price Improvement" shall occur whenever a Profile submitted by an
End-User results in an execution at a price that is superior by at least one
standard Nasdaq price increment compared to the most aggressive price specified
in the Profile for the size of that trade. If the Nasdaq Stock Market shall
permit decimalization of prices in the future, the Parties shall agree on a
revised definition of Price Improvement at that time.

       "Profiles" shall mean the expression of trading interest in the form of a
satisfaction profile that shows an End User's degree of satisfaction (expressed
as a number between zero and one) to trade at each coordinate of a grid showing
price and

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<PAGE>   42

size. In the case of the Nasdaq Application, such Profiles may be directly
entered by End Users through Terminal Programs or created by the OptiMark
Matching Module to reflect the BBO.

       "Progress Report" shall have the meaning provided in Section 7.3.

       "Project Coordinator" shall have the meaning provided in Section 7.1.

       "Rebate Cap" shall mean the maximum amount of the Nasdaq Service Fee that
Nasdaq shall agree to share with OptiMark under Section 14.1 of this Agreement
to assist OptiMark in recovering its costs associated with its First Stage
purchase of Tandem Computers (or a substituted make or type) for the OptiMark
Matching Module. The Rebate Cap shall be equal to $1.1 million. If OptiMark
orders the Tandem Computers listed in August 27, 1998 memorandum and attached
quote no. 125994-69 within 30 days of the Effective Date, and the Tandem price
has changed, the Parties will adjust the Rebate Cap upward or downward by up to
$500,000.

       "Regulatory Approval" shall have the meaning provided in Section 10.1.

       "SEC" shall have the meaning provided in the first paragraph hereof.

       "Specifications" shall have the meaning provided in Section 2.1.

       "Specifications Phase" shall have the meaning provided in Section 2.1.

       "Standard Agreements" shall have the meaning provided in Section 12.2.

       "Steering Committee" shall have the meaning provided in Section 7.1.

       "Supplemental Account Agreement" shall have the meaning provided in
Section 12.2.

       "Tandem Computers" shall mean those computers identified in the
Specifications.

       "Terminal Programs" shall mean the Internet browser-like application at a
desktop used to enter Profiles.

       "Third Party Claim" shall have the meaning provided in Section 20.2(b).

       "Time Bombs" shall mean code, which is not described in the documentation
or Specification, the purpose of which is to halt effective operation or use of
the system by a Person other than the Party operating the system when triggered
by certain events or to detect non-compliance with law, its license, or the
terms of this Agreement.

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<PAGE>   43

       "Trap Door" shall mean the computer software that includes a means by
which an unauthorized user may circumvent the security protections of the system
or gain access without authorization of the party operating the system.

       "User Agreement" shall have the meaning provided in Section 12.2.

       "Virus" shall mean a code imbedded in the system, the purpose of which to
halt effective operation or use of the system when triggered by certain event or
upon use by a Person other than the Party operating the system.

       "Warrant Agreement" shall have the meaning provided in the third WHEREAS
clause hereof.

       "Warrants" shall have meaning provided in the Warrant Agreement.

       "Year 2000" shall have the meaning provided in Section 21(b).

                 IN WITNESS WHEREOF, the Parties agree to be bound by the
foregoing.

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------
<S>                                          <C>
------------------------------------         FOR PUBLICLY TRADED COMPANIES. Nasdaq and its
                                             affiliates (Corporations) have an internal policy of
By:  /s/   William A. Lupien                 monitoring or restricting trading by certain of its
------------------------------------         employees in publicly traded stocks where the
Name:                                        granting, renewal, or termination of the agreement
William A. Lupien                            is considered by the publicly traded company to be
                                             a "significant" event (one that could affect the
------------------------------------         price of your company's stock or require a public
Title:                                       announcement). WHILE THE CORPORATIONS OFFER
Chairman & CEO                               NO REPRESENTATION OR WARRANTY ABOUT THE ENFORCEMENT
------------------------------------         OF ITS POLICY OR THE SECURITIES ACTIVITIES OF ANYONE
AUTHORIZED OFFICER                           ASSOCIATED WITH THE CORPORATIONS, if your company
Date:  9-1-98                                believes its contracts with the Corporations may
                                             be "significant", please  initial here _________.
--------------------------------------------------------------------------------------------------
Executed this 1st day of September, 1998,
for and on behalf of:
The Nasdaq Stock Market, Inc. (Nasdaq)
By:  /s/   J. Patrick Campbell

------------------------------------
--------------------------------------------------------------------------------------------------
</TABLE>

Page 43

<PAGE>   44

<TABLE>
<S>                                          <C>
--------------------------------------------------------------------------------------------------
Name:
J. Patrick Campbell

------------------------------------
Title:
Chief Operating Officer

------------------------------------
--------------------------------------------------------------------------------------------------
</TABLE>

Page 44

<PAGE>   45

                                   SCHEDULE I
                                 SPECIFICATIONS

Page 45

<PAGE>   46

                                   SCHEDULE II

                            CRITICAL MILESTONE DATES

Critical Milestone Dates (including responsible Party)

       Mutual--Final Specifications--November 1, 1998

       Nasdaq--Filing of SEC Rules--November 9, 1998

       Neither Party--Approval by SEC (and other approval necessary from body
       with regulatory or oversight jurisdiction over any part of the Nasdaq
       Family) March 1, 1999

       OptiMark--Delivery of final version of OptiMark Matching Module to Nasdaq
       QC--March 1, 1999

       Nasdaq as to its portion of the Nasdaq Application and OptiMark as to its
       portion of the Nasdaq Application --Delivery by each Party of final
       version of its portion of Nasdaq Application to Nasdaq QC--April 1, 1999

       Nasdaq--Commencement of VPN Rollout -April 30, 1999

       Nasdaq--Completion of the Nasdaq QC Test--July 19, 1999

       OptiMark--Passing the Nasdaq QC Test--July 19, 1999

       Nasdaq--Operational Commencement Date--August 2, 1999

Page 46

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