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                                                                    EXHIBIT 10.4

               THIRD AMENDED AND RESTATED STOCKHOLDERS AGREEMENT
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          THIRD AMENDED AND RESTATED STOCKHOLDERS AGREEMENT (this "Agreement ")
                                                                   ---------
dated as of February 16, 2000 by and among PartMiner, Inc., a New York
corporation (the "Company"), Boston Ventures Limited Partnership V ("Boston
                  -------                                            ------
Ventures"), Seacoast Capital Partners Limited Partnership and Seacoast Investors
--------
LLC (together, "Seacoast"), Vulcan Securities Limited ("Vulcan"), Cahners
                --------                                ------
Information Holdings, Inc. ("CIH"), Information Handling Services Inc. ("IHS"),
                             ---                                         ---
Emil H. Dahan, Michael J. Galvin, Patricia Tuxbury Salem, Peter W. Jeng, James
L. McAlarney, III, IHD-PM, LLC (IHD-PM, LLC and Messrs. Dahan, Galvin, Jeng and
McAlarney and Ms. Salem collectively, the "Individual Stockholders"), Daniel
                                           -----------------------
Nissanoff ("DN"), Integral Capital Partners IV, L.P. and Integral Capital
            --
Partners IV MS Side Fund, L.P. (together, "Integral"), Agile Software Corp.
                                           --------
("Agile"), Impact Venture Partners L.P. ("Impact"), OMI Partnership Holdings
-------                                   ------
Ltd. ("Onex"), Generation Capital Partners L.P., State Board of Administration
       ----
of Florida and Generation Parallel Management Partners, L.P. (together, "GP"),
                                                                         --
Broadview SLP ("Broadview") and The Goldman Sachs Group, Inc. ("Goldman")
                ---------                                       -------
(Integral, Agile, Impact, Onex, GP, Broadview and Goldman collectively, the
"Series B Investors").
-------------------

                                  INTRODUCTION
                                  ------------

          The Company, Boston Ventures, Seacoast, Vulcan's assignor and DN
entered into a Stockholders Agreement dated as of March 16, 1999 (the "March 16
                                                                       --------
Agreement").
---------

          In order to induce CIH to make an investment in the Company, Boston
Ventures, Vulcan's assignor, Seacoast, the Company, CIH and DN entered into an
Amended and Restated Stockholders Agreement dated as of September 10, 1999 (the
"September 10 Agreement"), which amended and restated the March 16 Agreement.
 ----------------------

          In order to induce Vulcan's assignor to make an additional investment
in the Company, and IHS  and the Individual Stockholders to make an investment
in the Company, and to provide for the ongoing ownership and governance of the
Company, Boston Ventures, Vulcan, Seacoast, the Company, CIH, IHS, the
Individual Stockholders (with the exception of IHD-PM, LLC) and DN have entered
into the Second Amended and Restated Stockholders Agreement dated as of December
6, 1999 (the "December 6 Agreement"), which amended and restated the September
              --------------------
10 Agreement.

          Whereas, on this day IHD-PM, LLC purchased shares of Common Stock from
Bruce and Lynne Friedman pursuant to that certain Common Stock Purchase
Agreement dated February 15, 2000 (the "IHD-PM, LLC Common Stock Agreement").

          In order to induce the Series B Investors to make an investment in the
Company, the signatories to the December 6 Agreement, IHD-PM, LLC and the Series
B Investors wish to enter into this Agreement, which amends and restates the
December 6 Agreement.
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          NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties agree as follows:

                                   ARTICLE I
                              CERTAIN DEFINITIONS

          Section 1.01.  Certain Definitions.  As used herein, "Purchase
                         -------------------                    --------
Agreement" means the Stock Purchase Agreement dated March 16, 1999 among the
---------
Company, Boston Ventures, Vulcan's assignor and DN, as amended from time to
time.  As used herein, "Series A Shares" means the Company's Series A Preferred
                        ---------------
Stock, $.01 par value per share, issued and sold by the Company pursuant to the
Purchase Agreement.  As used herein, "Seacoast Purchase Agreement" means the
                                      ---------------------------
Stock Purchase Agreement dated March 16, 1999 among the Company, DN and
Seacoast, as amended from time to time.  As used herein, "CIH Purchase
                                                          ------------
Agreement" means the Stock Purchase Agreement dated September 10, 1999 among the
Company, DN and CIH, as amended from time to time.  As used herein, "Series B
                                                                     --------
Purchase Agreement" means the Preferred Stock Purchase Agreement dated February
------------------
16, 2000 among the Company and the Series B Investors (and Boston Ventures,
Seacoast, CIH and Vulcan), as such may be amended from time to time, whereby the
Company has issued and sold shares of its Series B Convertible Preferred Stock
(the "Series B Shares") to the Series B Investors.  As used herein, "Purchasers"
      ---------------                                                ----------
means Boston Ventures or its Full Transferee, Vulcan or its Full Transferee,
Seacoast or its Full Transferee, CIH or its Full Transferee, IHS or its Full
Transferee, each Individual Stockholder or his/her respective Full Transferee
and each Series B Investor or its respective Full Transferee.  As used herein,
"Full Transferee" means a stockholder of the Company who first becomes a
----------------
stockholder as a result of acquiring more than 50% of the securities of the
Company presently held by Boston Ventures, Vulcan, Seacoast, CIH, IHS, any
Individual Stockholder or any Series B Investor, respectively.  As used herein,
"Management Stockholders" means DN and any other person or entity who may after
 -----------------------
the date hereof become a holder of capital stock, options or warrants of the
Company and who becomes (or is required to become) a party to this Agreement as
provided herein, other than the Purchasers or any Full Transferee of Boston
Ventures, Vulcan, Seacoast, CIH, IHS, any Individual Stockholder or any Series B
Investor.  As used herein, "Stockholders" means the Purchasers and the
                            ------------
Management Stockholders.  As used herein, "Stock" means all capital stock of the
                                           -----
Company held by a Stockholder.  As used herein, "Majority of the Purchasers"
                                                 --------------------------
means the Purchasers holding a majority of the total number of shares of the
Company's outstanding common stock (on an as-converted basis) held by all such
Purchasers. All other capitalized terms used herein and not otherwise defined
shall have the meanings given to them in the Series B Purchase Agreement.

                                   ARTICLE II
                           BOARD OF DIRECTORS; VOTING

          Section 2.01.  Board Size.  The Board of Directors of the Company
                         ----------
shall consist of seven directors.  At all meetings (and written actions in lieu
of meetings) of stockholders of the Company at which the number of directors of
the Company is to be determined, each Stockholder shall vote all of such
Stockholder's Stock to fix the number of directors of the

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Company at seven.

          Section 2.02.  Election of Directors.  Except as provided in Section
                         ---------------------
2.04 below, at all meetings (and written actions in lieu of meetings) of
stockholders of the Company at which directors are to be elected, each
Stockholder shall vote all of such Stockholder's Stock to elect, as directors of
the Company (in addition to any other directors of the Company):

          (a) one nominee designated by Boston Ventures, who may be an Affiliate
of Boston Ventures;

          (b) one nominee designated by Vulcan, who may be an Affiliate of
Vulcan;

          (c) one nominee designated by Seacoast, who may be an Affiliate of
Seacoast;

          (d) two nominees designated by DN, or in case of the death or
disability of DN, two nominees designated by the Management Stockholders;

          (e) one nominee designated by CIH, who may be an Affiliate of CIH;
and

          (f) one nominee designated by the majority vote of the other six
directors of the Company's Board of Directors.

          Section 2.03.  Removal.  Each Stockholder agrees to vote such
                         -------
Stockholder's Stock, at all meetings (and written actions in lieu of meetings)
of stockholders of the Company, (a) to remove any director designated under
Subsection 2.02(a), if so requested by Boston Ventures, (b) to remove any
director designated under Subsection 2.02(b), if so requested by Vulcan, (c) to
remove any director designated under Subsection 2.02(c), if so requested by
Seacoast, (d) to remove any director designated under Subsection 2.02(d), if so
requested by DN or the Management Stockholders, as the case may be, (e) to
remove any director designated under Subsection 2.02(e), if so requested by CIH
and (f) to remove any director designated under Subsection 2.02(f), if so
requested by the majority vote of the other six directors of the Company's Board
of Directors.  Each Stockholder agrees not to vote such Stockholder's Stock in
favor of the removal of any director other than in accordance with the preceding
sentence.

          Section 2.04.  Vacancies.  Each Stockholder agrees to vote such
                         ---------
Stockholder's Stock, at all meetings (and written actions in lieu of meetings)
of stockholders of the Company, to fill any vacancy on the Board of Directors
caused by the resignation or removal of any director to be designated under
Subsections 2.02(a), (b), (c), (d), (e) or (f), with a nominee selected as
provided therein.

          Section 2.05.  Compensation Committee.  The Board of Directors shall
                         ----------------------
at all times maintain a Compensation Committee consisting of the four directors
appointed by a majority of the Purchasers.  The Compensation Committee shall
have sole authority, on behalf of the Board of Directors, to set the
compensation (including salary, bonus, benefits, and other amounts) to be paid
to officers and senior managers of and consultants to the Company and the

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Subsidiaries, and, subject to the approvals required hereunder, to grant stock
options and issue shares of stock or other equity or equity-related interests to
or for the benefit of employees or consultants.  The approval of a majority of
the members of the Compensation Committee shall be required to take action by
the Compensation Committee; provided that no member of the Compensation
                            --------
Committee may vote on his or her own compensation.

          Section 2.06.  Meetings.  The Company will cause its Board of
                         --------
Directors to meet on a regular basis, not less often than quarterly, and will
give each director at least 3 days prior notice of the time and place of any
meeting.

          Section 2.07.  Subsidiaries.  The Company will cause the Boards of
                         ------------
Directors and Committees thereof of each Subsidiary of the Company to have the
same composition as those of the Company, as provided in this Article II, and to
cause all Subsidiaries to be in compliance with the terms of this Article II as
if such Subsidiary were a party hereto to the same extent as the Company.

          Section 2.08.  Observation Rights.  Until the consummation of a
                         ------------------
Qualified Public Offering (as defined in Section 7.01 hereof), the Company shall
permit a representative of Integral (the "Representative") to attend all
meetings of the Board of Directors (whether in person, telephonically or
otherwise) in a non-voting, observing capacity and shall provide to the
Representative, concurrently with the members of the Board of Directors and in
the same manner, notice of such meeting and a copy of all materials provided to
such members.  Any oral or written exchange of confidential and/or proprietary
information between the Company and the Representative shall be governed by the
terms of a confidentiality agreement to be executed between the Company and
Integral promptly after the date hereof.

          Section 2.09.  Conflict with By-Laws.  To the extent that any
                         ---------------------
provision of this Article II conflicts with the By-Laws of the Company, such
provisions shall be subject to appropriate amendments to the By-Laws to be
adopted within 30 days after the Closing.

                                  ARTICLE III
                             TRANSFER RESTRICTIONS

          Section 3.01.  No Transfer.  (a) No Management Stockholder may sell,
                         -----------
pledge, give, assign, distribute, hypothecate, mortgage or transfer (all
hereinafter referred to as "transfer") any Stock owned by such Management
                            --------
Stockholder, directly or indirectly, to any other person or entity, (i) as long
as at least one Purchaser holds in excess of 50% of the Stock originally
purchased by Boston Ventures, Vulcan's assignor, Seacoast, CIH or the Series B
Investors pursuant to the Purchase Agreement, the Seacoast Purchase Agreement,
the CIH Purchase Agreement or the Series B Purchase Agreement, respectively, or
(ii) as permitted by Section 3.02.

          (b) Prior to the initial public offering of the Company's securities
(whether or not a Qualified Public Offering), no Stockholder (other than Agile)
may transfer any Stock to any

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person or entity operating a Competitive Business (as defined below) other than
an affiliate of such Stockholder (including any affiliated investment funds).
Notwithstanding the foregoing, Boston Ventures may transfer Stock to its limited
partners, Seacoast may transfer Stock to its limited partners, Onex may transfer
its Stock to its limited partners, GP may transfer its Stock to its limited
partners and Integral may transfer Stock to its limited partners and members.
For purposes of this Agreement, the term "Competitive Business" shall mean (i)
                                          --------------------
any business that develops or sells products or services that are competitive
with the Company's CAPSXpert database, (ii) any business that develops or sells
software for component and supplier management that is competitive with the
Company's products, (iii) any business that sells or distributes electronic
components that is competitive with the Company's products or (iv) any business
that provides an e-commerce web site which aggregates pricing and availability
data for electronic components that is competitive with the Company's products.

          Section 3.02.  Exceptions to Restrictions.   Notwithstanding any other
                         --------------------------
provision of this Agreement, the following transfers of Stock may be consummated
without restriction:

          (a) Transfers of Stock between a Management Stockholder and his
     guardian or conservator.

          (b) Transfers of Stock of a deceased Management Stockholder to his
     executors or administrators or to trustees under his will and thereafter to
     transferees enumerated in Subsection (c) below.

          (c) Transfers of Stock of a Management Stockholder to the Management
     Stockholder's spouse, to any of his children or their issue (or to
     custodians for the benefit of minor children or issue), or to the
     Stockholder's parents or siblings, or to a trust, the sole beneficiaries of
     which consist of any of the foregoing.

          (d) Transfers of Stock by DN to Bruce Friedman and Lynne Friedman
     pursuant to the letter agreement dated July 30, 1997 among DN and Stacy
     Jargowsky Nissanoff and Bruce Friedman and Lynne Friedman.

          (e) Transfers of Stock by DN to the employees of the Company set forth
     on Schedule 2.05(b) of the Purchase Agreement.

          (f) Transfers of Stock by Bruce and Lynne Friedman to Integral Capital
     Partners IV, L.P., Integral Capital Partners IV MS Side Fund, L.P. and IHD-
     PM, LLC.

          All Stock transferred pursuant to this Section shall remain subject to
the restrictions contained herein applicable to the initial Management
Stockholders in the hands of the transferee.

          Section 3.03.  Drag-Along Requirement. In the event that the Board of
                         ----------------------
Directors of the Company approves a sale or merger of the Company or a sale of
all or substantially all of the assets of the Company, and the transaction is
approved by a Majority of the Purchasers in

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accordance with Article VII of this Agreement, each Stockholder: (a) will vote
the Stock held by it in favor of such transaction and will not dissent to any
such transaction or seek appraisal of its Stock, or exercise any similar rights
with respect to such transaction; (b) will execute any agreement reasonably
required of it in connection with such transaction, including without limitation
any stock purchase or similar agreement; and (c) will cooperate with the Company
in all respects in consummating any such transaction.

          Section 3.04.  Legends.  All certificates representing shares of Stock
                         -------
issued to a Stockholder shall bear substantially the following legend:

          THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
          SECURITIES ACT OF 1933, AS AMENDED (THE "ACT") OR THE SECURITIES LAWS
                                                   ---
          OF ANY STATE.  SUCH SECURITIES HAVE BEEN ACQUIRED FOR INVESTMENT, AND
          MAY NOT BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED OR HYPOTHECATED IN THE
          ABSENCE OF EFFECTIVE REGISTRATION STATEMENTS COVERING SUCH SECURITIES
          UNDER THE ACT AND ANY APPLICABLE STATE SECURITIES LAWS, UNLESS THE
          HOLDER SHALL HAVE OBTAINED AN OPINION OF COUNSEL, SATISFACTORY TO THE
          COMPANY, THAT SUCH REGISTRATION IS NOT REQUIRED.

          In addition to the foregoing, all certificates representing shares of
Stock issued to a Management Stockholder after the date hereof shall bear
substantially the following legend:

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
          RESTRICTIONS ON TRANSFER AND OTHER OBLIGATIONS CONTAINED IN A
          STOCKHOLDERS AGREEMENT, AS AMENDED, BETWEEN THE COMPANY AND CERTAIN OF
          ITS STOCKHOLDERS, A COPY OF WHICH IS ON FILE WITH THE COMPANY AND WILL
          BE FURNISHED WITHOUT COST TO THE HOLDER HEREOF UPON WRITTEN REQUEST TO
          THE SECRETARY.

                                   ARTICLE IV
                               PREEMPTIVE RIGHTS

          Section 4.01.  Notice of Sale.  The Company will give the Purchasers
                         --------------
and DN (each an "Offeree") at least 30 days prior written notice of any proposed
sale or issuance for cash or cash equivalents by the Company of any capital
stock, or any stock or security convertible into or exchangeable for capital
stock and any right, warrant or option to acquire capital stock or such
convertible securities ("Common Stock Equivalents") or any evidence of
                         ------------------------
indebtedness issued in conjunction with Common Stock Equivalents, except for (a)
the grant of options and warrants to purchase shares of the Company's Common
Stock (and the issuance of shares of the Company's Common Stock upon the
exercise of such options and warrants, including any of the foregoing

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that are presently outstanding) by the Compensation Committee of the Company's
Board of Directors, (b) the sale by the Company of Common Stock pursuant to a
Qualified Public Offering, as hereafter defined, (c) the issuance of shares of
Common Stock upon conversion or exercise of Common Stock Equivalents as to which
each Offeree was offered the opportunity to purchase its Proportionate
Percentage (as hereinafter defined) or as to which each Offeree was not required
to be offered such opportunity, (d) the issuance of any Common Stock Equivalent
pursuant to a stock split, stock dividend or similar event which is approved by
the Company's Board of Directors, (e) in connection with the acquisition of any
other entity or business by merger, purchase of assets or purchase of capital
stock approved by the majority vote of the Company's Board of Directors or (f)
in connection with equity issuances to strategic investors or partners, as
determined by the majority vote of the Board of Directors. Such notice will
identify the number of shares or amount of securities to be issued, the class of
shares or securities to be issued, the approximate date of issuance, and the
price and other terms and conditions of the issuance. Such notice will also
include an offer (the "Offer") to sell to each Offeree its Proportionate
                       -----
Percentage of such securities (the "Offered Securities") at the price and on the
                                    ------------------
other terms as are proposed for such sale or issuance, which Offer by its terms
shall remain open for a period of 15 days from the date of receipt of such
notice and which offer may be accepted by any such Offeree in its sole
discretion.

          Section 4.02.  Acceptance.  Each Offeree shall give notice to the
                         ----------
Company of its intention to accept an Offer prior to the end of the 15-day
period of such Offer, setting forth such portion of the Offered Securities which
such Offeree elects to purchase (the "Notice of Acceptance").  If any Offeree
                                      --------------------
fails to subscribe for its Proportionate Percentage of the Offered Securities,
the other Offerees shall be entitled to purchase such Offered Securities that
are not subscribed for by such Offeree in the same proportion in which they were
initially entitled to purchase the Offered Securities.  The Company shall notify
each Offeree five (5) days following the expiration of the 15-day period
described above of the amount of Offered Securities which each Offeree may
purchase pursuant to the foregoing sentence and each Offeree shall then have 10
days from the delivery of such notice to indicate such additional amount, if
any, that such Offeree wishes to purchase.

          Section 4.03.  Closing.  Upon the closing of the sale or issuance as
                         -------
to which the Company has given notice under Section 4.01, each Offeree shall
purchase from the Company, and the Company shall sell to each Offeree, the
Offered Securities subscribed for by each Offeree at the terms specified in the
Offer, which shall be the same terms at which all other persons or entities
acquire such securities in connection with such sale or issuance.

          Section 4.04.  Sale to Others.  If the Offerees do not subscribe for
                         --------------
all of the Offered Securities, the Company shall have 60 days from the end of
the foregoing 15- or 10-day period, whichever is applicable, to sell all or any
part of the balance of the Offered Securities which an Offeree has not agreed to
purchase, to any other persons or entities, in all material respects on terms
and conditions which are no more favorable to such other persons or entities or
less favorable to the Company than those set forth in the Offer.  Any Offered
Securities not purchased by an Offeree or other persons or entities in
accordance with Sections 4.03 or 4.04 may not be sold or otherwise disposed of
until they are again offered under the procedures

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specified in this Article IV.

          Section 4.05.  Proportionate Percentage.  For purposes of this Article
                         ------------------------
IV, "Proportionate Percentage" shall mean (a) the number of shares of Common
     ------------------------
Stock held by an Offeree (for this purpose, treating each option, warrant and
convertible security as the number of shares of Common Stock for which it is
then exercisable or convertible), divided by (b) the number of outstanding
shares of Common Stock (determined as provided in clause (a) above).

                                   ARTICLE V
                      AFFIRMATIVE COVENANTS OF THE COMPANY

          The Company shall comply with the following covenants unless otherwise
approved by a Majority of the Purchasers:

          Section 5.01.  Corporate Existence.  The Company shall, and shall
                         -------------------
cause each Subsidiary to, maintain its corporate existence, foreign
qualifications, and all rights, permits, licenses and authorizations material to
its business.  Notwithstanding the foregoing, the corporate existence of any
Subsidiary may be terminated with the approval of a majority of the members of
the Board of Directors of the Company.

          Section 5.02.  Use of Proceeds.  The Company shall use the net
                         ---------------
proceeds from the sale of the Series B Shares to the Series B Investors
principally for repaying certain outstanding indebtedness and for working
capital and general corporate purposes.

          Section 5.03.  Annual Financial Statements.  The Company shall furnish
                         ---------------------------
each Purchaser annual audited, consolidated and consolidating financial
statements of the Company and the Subsidiaries, including a balance sheet and
statements of income, cash flow and stockholders equity, within 90 days after
the end of each fiscal year, certified by a nationally recognized independent
public accounting firm reasonably acceptable to the Company's Board of
Directors, accompanied by an opinion of the Company's independent public
accountant.

          Section 5.04.  Quarterly Financial Statements.  The Company shall
                         ------------------------------
furnish each Purchaser quarterly consolidated and consolidating unaudited
financial statements of the Company and the Subsidiaries, including balance
sheets and statements of income, cash flow and stockholders equity, which shall
show a comparison to budget, within 45 days after the end of each month
accompanied by (a) management's analysis of results, and (b) a statement of the
Company's chief executive or chief financial officer explaining any variation of
such results from the budgeted results for such quarter set forth in the Budget
(as hereinafter defined) for such fiscal year.

          Section 5.05.  Budget.  For each fiscal year of the Company,
                         ------
management of the Company shall prepare and submit a monthly and annual
operating plan and budget, cash flow projections and profit and loss
projections, all in reasonable detail (collectively, the "Budget") for such
                                                          ------
fiscal year to the Board of Directors of the Company for its approval.  The
Company shall

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furnish each Purchaser the approved Budget promptly after its approval, but in
any event no later than 30 days prior to the beginning of each such fiscal year.
The Company shall not make material changes to the Budget without the prior
approval of its Board of Directors, and upon such approval information
concerning such material changes shall be furnished to each Purchaser.

          Section 5.06.  Other Information.  The Company shall deliver to each
                         -----------------
Purchaser:  (a) promptly after the occurrence thereof, written notice and a
description of any event, circumstance or condition, including any litigation,
claim or proceeding before any court or governmental authority, which has a
material adverse effect upon the Company, its consolidated financial condition,
results of operations, properties, prospects or business, (b) promptly after
receipt thereof, any material report or communication received by the Company or
any Subsidiary from its independent public accountants, including without
limitation any so-called "management letter", (c) promptly after the occurrence
thereof, a description of any material (on a consolidated basis) default by the
Company or any Subsidiary under any material agreement or arrangement of the
Company or any Subsidiary, including without limitation any agreement or
instrument relating to any material indebtedness of the Company or any
Subsidiary, (d) promptly upon making such materials available, copies of all
reports and other materials sent or made available generally to the stockholders
of the Company, or any material portion thereof, (e) promptly upon such
materials being filed, all materials submitted to the Securities and Exchange
Commission (the "Commission") or any securities exchange, and (f) such other
                 ----------
information with respect to the Company or any Subsidiary, or their respective
businesses, affairs, properties, prospects and any other matters relating
thereto which may be reasonably requested by any Purchaser, and which does not
impose an undue burden on management or interfere with management's
responsibilities to the Company.

          Section 5.07.  Inspection. The Company will permit any person
                         ----------
designated by a Purchaser, at reasonable intervals, on reasonable notice, to
visit and inspect any of the properties of the Company and the Subsidiaries,
during normal business hours, to examine their books, records and other
materials relating thereto (and to make copies thereof and take extracts
therefrom) and to discuss their affairs, finances and accounts with, and to be
advised as to the same by, their officers, employees, counsel and independent
certified public accountants.

          Section 5.08.  Books and Accounts.  The Company shall, and shall cause
                         ------------------
each Subsidiary to, keep complete and accurate records and books of account and
construe and report under all terms and provisions of this Agreement and all
agreements contemplated hereby in accordance with generally accepted accounting
principles consistently applied.

          Section 5.09.  Key Man Life Policy.  The Company shall use its best
                         -------------------
efforts to keep the key man life insurance policy currently in effect with
respect to DN in full force and effect until such time as DN ceases to be
employed by the Company.  The Company will add a designee, if any, of each
Purchaser as a notice party to such policy, and will request that the issuer of
such policy provide such designee with 10 days notice before such policy is
assigned or terminated for any reason, or before any changes are made in the
designation of the beneficiary thereof.  The Company shall use commercially
reasonable efforts to purchase (a) key man life

                                     - 9 -
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insurance for Mark Schenecker and (b) D&O insurance.

          Section 5.10.  Insurance.  The Company shall, and shall cause each
                         ---------
Subsidiary to, use its best efforts to have in full force and effect (a)
insurance on all assets and activities of a type and amount customarily insured,
covering property damage and loss of income by fire or other casualty, and (b)
adequate insurance protection against all liabilities, claims and risks against
which it is customary for companies similarly situated as the Company and the
Subsidiaries to insure.

          Section 5.11.  Compliance with Laws.  The Company will, and will cause
                         --------------------
each of its Subsidiaries to, comply with all applicable laws, rules,
regulations, orders and decrees of all governmental authorities, with respect to
which the failure to comply could have a material adverse effect on the
business, affairs, properties, prospects or condition of the Company or any
Subsidiary.

          Section 5.12.  Rule 144A Information.  Subject to a confidentiality
                         ---------------------
agreement with applicable third parties reasonably acceptable to the Company,
the Company shall, upon the written request of any Purchaser, provide to such
Purchaser or to any prospective institutional transferee of the Series A Shares
or Series B Shares designated by such Purchaser, such financial or other
information as is reasonably available to the Company or can be reasonably
obtained by the Company without material expense and as such Purchaser may
reasonably determine is required to permit such transfer to comply with the
requirements of Rule 144A promulgated under the Act.

          Section 5.13  Amendments to By-Laws.  The Company will use its best
                        ---------------------
efforts to cause its By-Laws to be amended in accordance with Section 2.09 of
this Agreement.

                                   ARTICLE VI
                       NEGATIVE COVENANTS OF THE COMPANY

          The Company shall comply with the following covenants unless otherwise
approved by a Majority of the Purchasers:

          Section 6.01.  Interested Transactions.  The Company shall not, and
                         -----------------------
shall not permit any Subsidiary to, buy, sell or lease any assets to or from,
borrow or lend any money to or from, or deal with or enter into any other
transactions or agreements with, any stockholders (other than the Purchasers and
their Affiliates), officer or director, or any known relative or Affiliate of
any of the foregoing, other than (a) as expressly contemplated by this Agreement
or any other agreement contemplated hereby or (b) those that are (i) fully
disclosed in advance to the Board of Directors, (ii) on terms no less favorable
to the Company or any Subsidiary than could have been obtained from an
unaffiliated third party, and (iii) approved by a disinterested majority of the
Board of Directors of the Company.

          Section 6.02.  Mergers.  The Company shall not, and shall not permit
                         -------
any Subsidiary to, (a) merge or consolidate with any person or entity, other
than a wholly-owned

                                     - 10 -
<PAGE>

Subsidiary in a transaction in which the Company is the surviving corporation
and in which its Certificate of Incorporation is not altered, or (b) sell, lease
(as lessor) or otherwise dispose of all or any substantial portion of its
assets.

          Section 6.03.  Dividends.  The Company shall not, and shall not permit
                         ---------
any Subsidiary to, pay or declare any dividend or make any distribution of money
or other property on account of any its Capital Stock, other than dividends of a
Subsidiary payable to the Company, or accord any other payment, benefit or
preference to any share of capital stock, other than dividends payable solely in
shares of Common Stock.

          Section 6.04.  Redemptions.  The Company shall not, and shall not
                         -----------
permit any Subsidiary to, purchase, redeem or otherwise acquire any share of
capital stock, or any options, warrants, convertible securities or other rights
to acquire capital stock other than (a) pursuant to Article VII of this
Agreement and (b) pursuant to the terms of grants of options, stock appreciation
rights, restricted shares of common stock, warrants and restricted stock units
pursuant to compensation or incentive plans approved by the Compensation
Committee, including any of the foregoing that are presently outstanding.

          Section 6.05.  Acquisitions and Investments.  The Company shall not,
                         ----------------------------
and shall not permit any Subsidiary to:

          (a) make any acquisition of securities or assets in excess of
$1,000,000; or

          (b) make any loan or advance to any person or entity other than in the
ordinary course of business or make any investment in or with any other person
or entity except:  (i) investments in evidences of indebtedness issued or fully
guaranteed by the United States of America and having a maturity of not more
than one year from the date of acquisition; (ii) investments and certificates of
deposit, notes, acceptances and repurchase agreements having a maturity of not
more than one year from the date of acquisition issued by a bank organized in
the United States having capital, surplus and undivided profits of at least
$50,000,000; (iii) loans or advances from a Subsidiary to the Company or from
the Company or a Subsidiary to another Subsidiary; (iv) investments in A-rated
(or equivalent) or better commercial paper having a maturity of not more than
one year from the date of acquisition; and (v) investments in "money market"
fund shares or in "money market" accounts fully insured by the Federal Deposit
Insurance Corporation and sponsored by banks and other financial institutions,
or in "money market" accounts sponsored by brokerage firms provided with such
"money market" fund or "money market" accounts invested principally in
investments of the types described in the foregoing clauses of this Subsection
(b).

          Section 6.06.  Limitation on Restrictions of Subsidiary Payments.  The
                         -------------------------------------------------
Company shall not permit any Subsidiary, directly or indirectly, to create or
permit to exist any encumbrances or restrictions on the ability of any
Subsidiary to (a) pay dividends or make any other distributions on its capital
stock or any interest or participation in its profit owned by any of the Company
or any Subsidiary, or pay any indebtedness owed by any of the Subsidiaries, (b)
make loans or advances to the Company; or (c) transfer any of its properties or
assets to the

                                     - 11 -
<PAGE>

Company.

          Section 6.07.  No Conflicting Agreements.  The Company shall not, and
                         -------------------------
shall not permit any Subsidiary to, enter into or amend any agreement, contract,
commitment or understanding which restricts or prohibits the exercise by the
Purchasers of any of their rights under this Agreement, any other agreement or
instrument contemplated hereby or the Certificate of Incorporation of the
Company, or restricts or prohibits the ability of the Company or any Subsidiary
to comply with its obligations to the Purchasers under this Agreement, any other
agreement or instrument or the Certificate of Incorporation of the Company.

          Section 6.08.  Issuance of Securities.  The Company shall not, and
                         ----------------------
shall not permit any Subsidiary to, issue shares of capital stock or options,
warrants, convertible securities or other rights which may afford any person or
entity the right to acquire shares of any class of capital stock of the Company
or any Subsidiary, except (a) upon the exercise or conversion of options listed
on a Schedule to this Agreement, or (b) the issuance of additional shares of
Common Stock and options and other rights to acquire shares of Common Stock.

          Section 6.09.  Financings. The Company shall not, and shall not permit
                         ----------
any Subsidiary to, enter into or materially modify any debt financing of the
Company or any Subsidiary, other than conventional senior debt on customary
terms, financing obtained in the ordinary course of business, including, but not
limited to, any line of credit or other bank facility, or in accordance with the
terms of this Agreement.

          Section 6.10.  Line of Business.  The Company shall not, and shall not
                         ----------------
permit any Subsidiary to, engage in any line of business other than (a) the
sale, distribution, procurement and/or transfer of electronic components and
information related thereto, (b) providing services related to the sale,
distribution, procurement and/or transfer of electronic components and
information related thereto, and (c) any e-commerce or other online activity
related to the sale, distribution, procurement and/or transfer of electronic
components and information related thereto.

                                  ARTICLE VII
                        RIGHT TO PUT CERTAIN SECURITIES

          Section 7.01.  Right of the Purchasers to Put Certain Securities.  If
                         -------------------------------------------------
the Company has not completed a Qualified Public Offering and except in the case
of a liquidation or dissolution of the Company, then (a) at any time on or after
the fifth anniversary of the date of issuance by the Company to a Purchaser,
with respect to the Series A Shares or Series B Shares, (b) at any time on or
after the seventh anniversary of the date of issuance by the Company to a
Purchaser, with respect to the Common Stock, or (c) if earlier, upon exercise by
any other Stockholders of a put right under this Article VII (each of the
foregoing being referred to herein as a "Securities Put Event"), then each
                                         --------------------
Purchaser shall have the right, by giving notice to the Company, to require the
Company to purchase all of the Stock and Common Stock Equivalents of the Company
owned by it in accordance with this Article VII. As used herein, "Qualified
                                                                  ---------
Public Offering" means a public offering by the Company of its Common Stock
---------------
pursuant to a

                                     - 12 -
<PAGE>

registration statement under the Act, other than a registration relating solely
to a transaction under Rule 145 under the Act (or any successor thereto) or to
an employee benefit plan of the Company in which the aggregate net proceeds to
the Company exceed $30 million at a public offering price per share of at least
$6.06 (as adjusted for any subsequent stock dividends, stock splits or
recapitalizations).

          Section 7.02.  Purchase Price.  The Company shall repurchase the Stock
                         --------------
and Common Stock Equivalents of the Purchaser exercising its rights under
Section 7.01 at a price equal to its fair market value; provided, however, that
                                                        --------  -------
if the Securities Put Event under clause 7.01(i) occurs after the eighth
anniversary of the date hereof, the repurchase price shall be equal to the
original purchase price paid therefor by the original Purchaser of such Stock
and Common Stock Equivalents.  For purposes of determining the fair market value
of the Stock and Common Stock Equivalents, the Stock and Common Stock
Equivalents shall be valued as if it were being sold as part of the sale of all
outstanding equity securities of the Company to an unrelated third party in an
arms-length transaction for cash only, without deduction for illiquidity,
minority interest, lack of control or any other similar considerations, and all
proceeds of such sale were being distributed in accordance with the Company's
Certificate of Incorporation proportionately among the holders of the Company's
capital stock on a fully-diluted basis (excluding options, warrants and
conversion privileges not then exercisable), with holders of currently
exercisable options or warrants receiving the net value thereof.  The fair
market value of the Stock and Common Stock Equivalents shall be determined as
follows:

          (a) By Agreement.  The Company and such Purchaser shall endeavor in
              ------------
good faith to agree on the fair market value of the Stock and Common Stock
Equivalents to be repurchased.

          (b) By Appraisal.  If the Company and such Purchaser  are unable to
              ------------
agree on the value of the Stock and Common Stock Equivalents within 30 days
after delivery of the notice under Section 7.01, the fair market value of the
Stock and Common Stock Equivalents to be repurchased shall be determined by
appraisal (the "Appraised Value") by a nationally recognized investment banker
                ---------------
with experience in the industry in which the Company and the Subsidiaries are
engaged, selected by the such Purchaser and reasonably acceptable to the
Company's Board of Directors (excluding such Purchaser's Director), which
investment banker shall not be affiliated with the Company or such Purchaser.
If, within 45 days after delivery of the notice referred to in Section 7.01, an
investment banker has not been selected, such Purchaser and the Company's Board
of Directors (excluding such Purchaser's Director) shall each select an
investment banker, and such investment banker shall select a third investment
banker meeting the criteria specified above who shall conduct the appraisal.
The appraiser shall value the Company and the Stock and Common Stock Equivalents
to be purchased as if (i) the Company and such Stock and Common Stock
Equivalents were being sold as part of the sale of all outstanding securities of
the Company to an unrelated third party in an arms-length transaction for cash
only, without deduction for illiquidity, minority interest, lack of control or
any other similar consideration, and (ii) all proceeds of the deemed sale
referred to above were being distributed among the Stockholders in accordance
with the Certificate of Incorporation (treating Common Stock Equivalents as the
number of shares of Stock for which they would then be exercisable in

                                     - 13 -
<PAGE>

accordance with the preceding clause).

          Section 7.03.  Payment.  Within 20 days following the final
                         -------
determination of the purchase price under Section 7.02, or such other time as
shall be agreed to by the Company and such Purchaser, the Company shall purchase
the Stock and Common Stock Equivalents held by such Purchaser at the price
determined in accordance with Section 7.02, and such Purchaser shall deliver to
the Company, upon receipt of payment therefor, certificates for the Stock and
Common Stock Equivalents duly endorsed for transfer to the Company.  Payment
shall be made by wire transfer of immediately available funds to an account
designated by such Purchaser.

          Section 7.04.  Certain Remedies. In the event that the Company does
                         ----------------
not fulfill its obligation to pay the purchase price of all or any portion of
the Stock pursuant to this Article VII within the time frame set forth in
Section 7.03, the unpaid portion of the purchase price of the Stock will bear
interest at the lesser of (i) fifteen percent (15%) or (ii) the highest rate
permitted by applicable law, compounding semi-annually. The Company will, upon
the request of any such Purchaser exercising its rights under Section 7.01,
execute and deliver to such Purchaser a promissory note in form and substance
reasonably satisfactory to such Purchaser evidencing such obligation.

          Section 7.05.  Expenses.  The Company will bear all reasonable costs
                         --------
of determining Appraised Value in connection with any exercise of rights of the
Purchasers hereunder.

                                  ARTICLE VIII
                                 MISCELLANEOUS

          Section 8.01.  Notices. All notices under this Agreement shall be in
                         -------
writing.  Any notice shall be deemed to have been duly given if delivered
personally, three (3) business days after mailing registered or certified mail,
return receipt requested, or sent by nationally recognized overnight delivery
service, to the parties hereto at the addresses set forth on Exhibit A hereto.
                                                             ---------
Upon notice from any Stockholder of a change of address, the Company's Board of
Directors will cause Exhibit A to be amended to reflect the new address of such
                     ---------
Stockholder.  The address of any new Stockholder shall be added by the Board to
Exhibit A.
---------

          Section 8.02.  Binding Effect and Benefit.  This Agreement shall be
                         --------------------------
binding upon, and inure to the benefit of, the Company and the Stockholders and
their respective heirs, legal representatives, successors and Full Transferees,
except that neither the Company nor any Purchaser that acquires Stock from a
Management Stockholder shall be subject to the obligations of the Management
Stockholders hereunder. Notwithstanding the foregoing, a Purchaser's rights
hereunder shall terminate upon the transfer of such Purchaser's Stock to a Full
Transferee.

          Section 8.03.  Waivers, Entire Agreement, Modifications.  No party
                         ----------------------------------------
shall be deemed to waive any rights hereunder unless such waiver be in writing
and signed by the Company, Management Stockholders holding a majority of the
Common Stock held by

                                     - 14 -
<PAGE>

Management Stockholders and the Purchasers or, in the event the right to be
waived is that of less than all the Purchasers, those Purchasers with such
right.  A waiver in writing on one occasion shall not be construed as a consent
to or a waiver of any right or remedy on any future occasion.

          Section 8.04.  Governing Law, Construction.  This Agreement shall be
                         ---------------------------
governed by and construed and enforced in accordance with the internal laws of
the State of New York.  Wherever possible, each provision of this Agreement
shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision hereof shall be prohibited by or invalid
under any such law, such provision shall be ineffective to the extent of such
prohibition or invalidity, without invalidating or nullifying the remainder of
such provision or any other provisions of this Agreement.

          Section 8.05.  Transferees of Stockholders.  Notwithstanding anything
                         ---------------------------
herein to the contrary, no Stockholder shall transfer any Stock (except to the
Company) unless the person, firm, corporation or other entity so acquiring such
Stock shall first become a signatory to this Agreement, agreeing to be bound by
all the terms of this Agreement.  Notwithstanding anything herein to the
contrary, a Full Transferee of Boston Ventures, Vulcan, Seacoast, CIH, IHS,
Individual Stockholder or any Series B Investor shall obtain, in lieu of Boston
Ventures, Vulcan, Seacoast, CIH, IHS, any Individual Stockholder or any Series B
Investor all of the rights, benefits and obligations of Boston Ventures, Vulcan,
Seacoast, CIH, IHS, any Individual Stockholder or any Series B Investor
hereunder, respectively.  All transferees of a Purchaser other than a Full
Transferee who shall become a party to this Agreement shall be deemed to be
Management Stockholders hereunder.  The Company shall not transfer any shares of
Stock on its books which have been transferred in violation of this Agreement,
or to treat as the owner of such shares of Stock, or to accord the right to vote
as such owner or to pay dividends to, any person or entity to which any such
shares of Stock shall have been transferred, from and after any transfer of any
share of Stock made in violation of this Agreement.

          Section 8.06.  Representations of Stockholders.  Each Stockholder
                         -------------------------------
represents and warrants to each other party that such Stockholder is not bound
by any agreement or commitment that conflicts with or would interfere with the
performance of such Stockholder's obligations under this Agreement.

          Section 8.07.  Termination.  This Agreement shall terminate upon a
                         -----------
Qualified Public Offering.

          Section 8.08.  Confidentiality.  Each Stockholder agrees to keep
                         ---------------
confidential (a) all material confidential information regarding the other
Stockholders of which the Stockholders become aware by virtue of, or in
connection with, their performance of this Agreement and (b) any trade secrets
or other confidential information of a business, financial, marketing,
technical, or other nature pertaining to the Company and identified as such by
the Company (or which clearly constitutes confidential information), including
information of others that the Company has agreed to keep confidential and has
informed the Stockholders of such ("Confidential Information").  Each
                                    ------------------------
Stockholder shall not disclose any such Confidential Information to any

                                     - 15 -
<PAGE>

third party, except (i) to the extent disclosure of such Confidential
Information is required for performance of this Agreement, (ii) for such
employees, independent contractors, representatives and advisors of the
Stockholders that have a need to know such information to perform their
obligations under this Agreement and (iii) as may be required by law or
regulation. The term "Confidential Information" shall not be deemed to include
any information which (i) at the time of disclosure is or thereafter becomes
generally available to and known by the public (other than as a result of
disclosure directly or indirectly by the Stockholders), (ii) was available to
the Stockholders on a non-confidential basis from a source other than one of the
Stockholders or their employees, independent contractors, representatives and
advisors, provided that such source is not in breach of any obligations or
confidentiality to the Stockholders, or (iii) has been independently acquired or
developed by the Stockholders without violating any of the Stockholder
obligations pursuant to this Agreement. Each Stockholder agrees that its
respective employees, independent contractors, representatives and advisors
directly involved in the execution, delivery and performance of this Agreement
shall be promptly informed by such Stockholder of the confidential nature of the
Confidential Information. Notwithstanding the foregoing, a Stockholder may
disclose Confidential Information in the event that such Stockholder is required
or becomes legally compelled (by oral questions, interrogatories, requests for
information or documents, subpoena, civil investigative demand or similar
process) to disclose such Confidential Information; provided, however, that such
                                                    --------  -------
Stockholder shall promptly advise the non-disclosing Stockholder of such request
or legal compulsion and to the extent that the non-disclosing Stockholder
secures a legally enforceable protective order, the disclosing Stockholder shall
comply with such protective order.

          Section 8.09.  Consent and Waiver.  Boston Ventures, Seacoast, Vulcan,
                         ------------------
CIH, IHS, the Individual Stockholders and DN each being a signatory to one or
more of the following documents, (i) the December 6 Agreement, (ii) the Amended
and Restated Registration Rights Agreement dated December 6, 1999, by and among
the Company, Boston Ventures, Seacoast, Vulcan, CIH, IHS and the Individual
Stockholders, (iii) the CIH Purchase Agreement, or (iv) the Agreement and Plan
of Merger between the Company, Partminer Acquisition Corp., IQXpert Holdings,
Inc., IHS, Vulcan and the Individual Stockholders, hereby consent to the
transactions contemplated by: (A) the Series B Purchase Agreement by and between
the Company and the Series B Investors, (B) the Amended and Restated
Registration Rights Agreement dated the date hereof by and among the parties
hereto (other than DN), (C) this Agreement and (D) all other agreements or
instruments contemplated by the foregoing agreements (drafts of which have been
provided to Boston Ventures, Seacoast, Vulcan, CIH, IHS, the Individual
Stockholders and DN).  Boston Ventures, Seacoast, Vulcan, CIH, IHS, the
Individual Stockholders and DN, and each further waives any preemptive rights or
notice provisions and any restrictions on transfers of stock and the granting of
registration rights as contemplated in this agreement, the Series B Agreement,
the Registration Rights Agreement and the Common Stock Purchase Agreements
between Bruce and Lynne Friedman and Integral Capital Partners IV L.P., Integral
Capital Partners IV MS Side Fund, L.P. and IHD-PM, LLC.  Each of Boston
Ventures, Seacoast, Vulcan, CIH, IHS and the Individual Stockholders hereby
waives any rights such Purchaser has under Articles IV and VI of the December 6
Agreement in respect of the sale of Series B Shares pursuant to the Series B
Purchase Agreement, except to the extent of any rights such Purchaser may have
under the Series B Purchase Agreement or, with respect to the Individual
Stockholders,

                                     - 16 -
<PAGE>

pursuant to the  IHD-PM, LLC Common Stock Purchase Agreement.

          Section 8.10.  Treatment of IHS and Individual Stockholders.
                         --------------------------------------------
Notwithstanding anything to the contrary contained herein, neither IHS nor any
Individual Stockholder will be deemed to be a Purchaser for purposes of (a) the
definition "Majority of the Purchasers" or (b) Article 4, and Sections 5.05,
5.07, 5.09, 5.12, 7.01, 7.02, 7.03, 7.04 and 7.05 of this Agreement.

                                     - 17 -
<PAGE>

     IN WITNESS WHEREOF, the parties have caused this Agreement to be executed
as a sealed instrument as of the date and year first above written.

                                    PARTMINER, INC.

                                    By: /s/ Daniel Nissanoff
                                       ---------------------------------
                                       Name:

                                    ------------------------------------
                                         Daniel Nissanoff

                                    BOSTON VENTURES LIMITED
                                    PARTNERSHIP V
                                    By:  Boston Ventures Management, Inc.

                                    By: /s/ James Wilson
                                       ---------------------------------
                                       Name:

                                    VULCAN SECURITIES LIMITED

                                    By: /s/ Michael von Staudt
                                       ---------------------------------
                                       Name:

                                    SEACOAST CAPITAL PARTNERS
                                    LIMITED PARTNERSHIP

                                    By:  Seacoast I Advisors LLC,
                                         its General Partner

                                    By: /s/ Eben S. Moulton
                                       ---------------------------------
                                       Name:

                                    SEACOAST INVESTORS LLC

                                    By: /s/ Eben S. Moulton
                                       ---------------------------------
                                       Name:

                                     - 18 -
<PAGE>

                                    CAHNERS INFORMATION HOLDINGS, INC.

                                    By: /s/ Charles Fontaine
                                       ---------------------------------
                                       Name:

                                    INFORMATION HANDLING SERVICES INC.

                                    By: /s/ L. Christopher Meyer
                                       ---------------------------------
                                       Name:

                                        /s/ Emil H. Dahan
                                    ------------------------------------
                                        Emil H. Dahan

                                        /s/ Michael J. Galvin
                                    ------------------------------------
                                        Michael J. Galvin

                                        /s/ Patricia Tuxbury Salem
                                    ------------------------------------
                                        Patricia Tuxbury Salem

                                        /s/ Peter W. Jeng
                                    ------------------------------------
                                        Peter W. Jeng

                                        /s/ James L. McAlarney III
                                    ------------------------------------
                                        James L. McAlarney III

                                    IHD-PM, LLC

                                    By: /s/ Emil H. Dahan
                                       ---------------------------------
                                       Name:  Emil H. Dahan

                                     - 19 -
<PAGE>

                                    INTEGRAL CAPITAL PARTNERS IV, L.P.
                                    By:  Integral Capital Management IV, LLC,
                                         its General Partner

                                    By: /s/ Pamela K. Hagenah
                                       ---------------------------------
                                       Name:  Pamela K. Hagenah
                                       Title: Manager

                                    INTEGRAL CAPITAL PARTNERS IV
                                      MS SIDE FUND, L.P.
                                    By:  Integral Capital Partners NBT, LLC,
                                           its General Partner

                                    By: /s/ Pamela K. Hagenah
                                       ---------------------------------
                                       Name:  Pamela K. Hagenah
                                       Title: Manager

                                    AGILE SOFTWARE CORP.

                                    By: /s/ Thomas P. Shanahan
                                       ---------------------------------
                                       Name:

                                    IMPACT VENTURE PARTNERS L.P.

                                    By: /s/ Adam Dell
                                       ---------------------------------
                                       Name:

                                    OMI PARTNERSHIP HOLDINGS LTD.

                                    By: /s/ A.R. Melman
                                       ---------------------------------
                                       Name:

                                     - 20 -
<PAGE>

                                    GENERATION CAPITAL PARTNERS PARTNERS L.P.

                                    By:  Generation Partners L.P., as General
                                         Partner

                                         By:  Generation Capital Company LLC,
                                              as General Partner

                                         By: /s/ Mark Jennings
                                            ----------------------------
                                            Mark Jennings
                                            Managing Director

                                    STATE BOARD OF ADMINISTRATION OF FLORIDA

                                    By:  Generation Parallel Management
                                         Partners L.P., as Manager

                                         By:  Generation Capital Company LLC,
                                              as General Partner

                                         By: /s/ Mark Jennings
                                            ----------------------------
                                            Mark Jennings
                                            Managing Director

                                    GENERATION PARALLEL MANAGEMENT PARTNERS L.P.

                                    By:  Generation Capital Company LLC,
                                         as General Partner

                                         By: /s/ Mark Jennings
                                            ----------------------------
                                            Mark Jennings
                                            Managing Director

                                    BROADVIEW SLP

                                    By: /s/ Peter Mooney
                                       ---------------------------------
                                       Name:

                                     - 21 -
<PAGE>

                                    THE GOLDMAN SACHS GROUP, INC.

                                    By: /s/ Joseph Gleberman
                                       ---------------------------------
                                       Name:

                                     - 22 -<PAGE>

                                                                    EXHIBIT 10.5

            THIRD AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT
            --------------------------------------------------------

          THIRD AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT (this
"Agreement") dated as of February 16, 2000 by and between PartMiner, Inc., a New
----------
York corporation (the "Company"), and Boston Ventures Limited Partnership V
                       -------
("Boston Ventures"), Seacoast Capital Partners Limited Partnership and Seacoast
-----------------
Investors LLC (together, "Seacoast"), Vulcan Securities Limited ("Vulcan"),
                          --------                                ------
Cahners Information Holdings, Inc. ("CIH"), Information Handling Services Inc.
                                     ---
("IHS"), Integral Capital Partners IV MS Side Fund, L.P. and Integral Capital
  ---
Partners IV, L.P. (together, "Integral"), Agile Software Corp. ("Agile"), Impact
                              --------                           -----
Venture Partners L.P. ("Impact"), OMI Partnership Holdings Ltd. ("Onex"),
                        ------                                    ----
Generation Capital Partners L.P., State Board of Administration of Florida and
Generation Parallel Management Partners, L.P. (together, "GP"), Broadview SLP
                                                          --
("Broadview"), The Goldman Sachs Group, Inc. ("Goldman") (Integral, Agile,
-----------                                    -------
Impact, Onex, GP, Broadview and Goldman collectively, the "Series B Investors"),
                                                           ------------------
Emil H. Dahan, Michael J. Galvin, Patricia Tuxbury Salem, Peter W. Jeng, James
L. McAlarney, III and IHD-PM, LLC (IHD-PM, LLC and Messrs. Dahan, Galvin, Jeng
and McAlarney and Ms. Salem collectively, the "Individual Purchasers"; and
                                               ---------------------
together with Boston Ventures, Seacoast, Vulcan, CIH, IHS and the Series B
Investors, the "Purchasers").
                ----------

                                  INTRODUCTION
                                  ------------

          Boston Ventures has purchased shares of the Company's Series A
Preferred Stock, $.01 par value per share (the "Series A Shares"), and Vulcan's
                                                ---------------
assignor has purchased shares of the Company's common stock, $.0001 par value
per share (the "Common Stock"), pursuant to a Stock Purchase Agreement dated as
                ------------
of March 16, 1999 (the "Purchase Agreement").  CIH has purchased shares of
                        ------------------
Common Stock, pursuant to a Stock Purchase Agreement dated September 10, 1999
(the "CIH Purchase Agreement").  IHS, Vulcan's assignor (in addition to the
      ----------------------
Common Stock purchased by its assignor pursuant to the Purchase Agreement) and
the Individual Purchasers acquired shares of Common Stock pursuant to an
Agreement and Plan of Merger dated as of November 30, 1999 (the "Merger
                                                                 ------
Agreement").  IHD-PM, LLC has acquired shares of Common Stock pursuant to a
---------
Common Stock Purchase Agreement by and between Bruce and Lynne Friedman and IHD-
PM, LLC dated February 16, 2000.

          The Series B Investors, CIH, Seacoast, Boston Ventures and Vulcan have
agreed to purchase shares of the Company's Series B Convertible Preferred Stock
(the "Series B Shares") pursuant to a Preferred Stock Purchase Agreement dated
      ---------------
February 16, 2000 (the "Series B Purchase Agreement").  The parties hereto,
                        ---------------------------
except the Series B Investors and Seacoast Investors LLC, executed an Amended
and Restated Registration Rights Agreement dated as of December 6, 1999 (the
"December 6 Registration Rights Agreement") as a condition precedent to the
-----------------------------------------
obligation of IHS, the Company, Vulcan's assignor and the Individual Purchasers
to enter into the Merger Agreement.  The execution of this Agreement (which
amends and restates the December 6 Registration Rights Agreement) is a condition
precedent to the obligation of the Series B Investors, CIH, Seacoast, Boston
Ventures, Vulcan and the Company to consummate
<PAGE>

the Series B Purchase Agreement. Capitalized terms used herein and not otherwise
defined shall have the meanings given to them in the Series B Purchase
Agreement.

          NOW, THEREFORE, in consideration of the mutual covenants and
agreements hereinafter set forth, and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the parties agree
as follows:

          Section 1.  Demand Registration Rights.  (a)  Commencing on the date
                      --------------------------
which is 180 days (or such later date as may be required by the underwriting
agreement in the initial public offering) after the closing date of the initial
public offering of Common Stock under the Securities Act of 1933, as amended
(the "Act"), if holders of more than 30% of the Registrable Securities (as
defined in Section 4) request the Company to file a registration statement under
the Act for a firm commitment underwritten public offering of not less than 25%
of the Registrable Securities (or any lesser percentage if the anticipated
aggregate offering price of such offering, net of underwriting discounts and
commissions, exceeds $30 million), the Company shall promptly give written
notice of the proposed registration to all other holders of Registrable
Securities and, as soon as practicable, use its best efforts to so register
under the Act the Registrable Securities requested to be registered by the
Purchasers.  The Company is obligated to effect two such demand registrations,
which shall not be within the same six month period.

          (b) If the Company shall furnish to the requesting Purchasers a
certificate signed by the President or Chief Executive Officer of the Company
stating that, in the good faith judgment of the Board of Directors (excluding
the nominees of the requesting Purchaser), (i) such registration would have an
adverse effect on any plan by the Company to engage in any acquisition of
material assets or any merger, consolidation, tender offer, or similar
transaction, (ii) such registration would require the Company to file a
registration statement which includes audited financial statements as of the
date other than the date as of which the Company regularly prepares audited
financial statements, provided that this clause (ii) shall not apply if the
requesting Purchasers shall agree to pay all such additional expenses incurred
by the Company with respect to the preparation of such financial statements,
(iii) such registration would interfere with any material transaction involving
the Company or would require premature disclosure thereof, or (iv) such
registration would have a material adverse effect on the distribution of a
registered primary offering of equity securities by the Company pursuant to a
registration statement effective before the date of such demand, the Company
shall have the right to defer the filing of a Registration Statement with
respect to such offering for a period of not more than 90 days from delivery of
the request of the Purchasers; provided, however, that the Company may not
                               --------  -------
utilize this right more than twice during any 12-month period.

          (c) If the underwriter managing the offering determines that, because
of marketing considerations, all of the Registrable Securities requested to be
registered may not be included in the offering, then all holders of Registrable
Securities who have requested registration shall participate in the offering pro
rata based upon the number of Registrable Securities which they have requested
to be so registered.  If any such reduction results in the inclusion of less
than 70% of the Registrable Securities requested by the Purchasers to be

                                       2
<PAGE>

included in the offering, such registration shall not reduce the number of
registrations available to the Purchasers under this Section 1.

          (d) If the Company includes in any registration required under this
Section 1 a number of shares other than Registrable Securities that exceeds the
number of Registrable Securities to be included, then such registration shall be
deemed to be a registration under Section 2 hereof instead of this Section 1.
In all other cases where the Company includes in such registration any shares
other than Registrable Securities, such registration shall remain subject to
this Section 1, provided that in no event shall other shares be included if such
inclusion would (i) prevent holders of Registrable Securities from registering
all Registrable Securities requested by them or (ii) materially adversely affect
the offering price of the Registrable Securities in such registration.

          Section 2.  Piggyback Registration Rights.  (a)  Whenever the Company
                      -----------------------------
proposes to register any Common Stock for its own or others' account under the
Act, other than a registration relating to employee benefit plans or a
registration solely relating to shares to be sold under Rule 145 under the Act,
the Company shall give each holder of Registrable Securities and Individual
Registrable Securities (as defined in Section 4) prompt written notice of its
intent to do so.  Upon the written request of any such holder given within 15
days after receipt of such notice, the Company will use its best efforts to
cause to be included in such registration all of the Registrable Securities and
Individual Registrable Securities which such holder requests.

          (b) If the Company is advised in writing in good faith by any managing
underwriter of the securities being offered pursuant to any registration
statement under this Section 2 that, because of marketing considerations, the
number of shares to be sold by persons other than the Company is greater than
the number of such shares which can be offered without adversely affecting the
offering, the Company may reduce pro rata the number of shares offered for the
accounts of such persons (based upon the number of shares requested by each such
person to be included in the registration) to a number deemed satisfactory by
such managing underwriter, unless the registration statement is filed pursuant
to a demand registration right of a person, in which case the shares of such
person shall be offered first, and no additional shares shall be included until
all of the shares subject to the demand registration have been included.

          Section 3.  Form S-3 Registration Rights.  Subject to Section 1(b),
                      ----------------------------
if, at a time when Form S-3 is available for such registration, the Company
shall receive from the holders of at least 30% of Registrable Securities a
written request or requests that the Company effect a registration on Form S-3
of any of its Registrable Securities, the Company will promptly give written
notice of the proposed registration to all other holders of Registrable
Securities and, as soon as practicable, effect such registration and all related
qualifications and compliances as may be requested and as would permit or
facilitate the sale and distribution of all Registrable Securities as are
specified in such request and any written requests of other holders given within
15 days after receipt of such notice. The Company shall have no obligation to
effect a registration under this Section 3 (a) unless the aggregate offering
price of the Registrable Securities requested to be sold pursuant to such
registration is expected to be equal to or greater than $3,000,000 or (b) more
often than once in any six-month period.  Any registration under this

                                       3
<PAGE>

Section 3 will not be counted as a registration under Section 1 above.
Notwithstanding anything herein to the contrary, the Company shall only be
obligated to pay the expenses set forth in Section 8 hereof, for three (3)
registrations under this Section 3 and shall only be obligated to effect a total
of six (6) registrations under this Section 3.

          Section 4.  Registrable Securities. (a) "Registrable Securities" means
                      ----------------------
(x) any shares of Common Stock (i) held by Vulcan, IHS (or any assignees of any
shares of Common Stock originally held by Vulcan or IHS), CIH or Integral and
any other shares of Common Stock issued in respect of such securities (as a
result of stock splits, stock dividends, reclassifications, recapitalizations or
other events), (ii) issued upon the conversion by Seacoast of the Warrant to
purchase Common Stock of the Company dated July 30, 1997 or (iii) issued upon
the conversion of the Series A Shares or Series B Shares held by any Purchasers;
provided, that with regard to Sections 1(a), 3, 12 and 19 hereof, references to
--------
"Registrable Securities" shall mean, with respect to clause (iii) of this
Section 4(a), shares of Common Stock issued or issuable upon conversion of
Series A Shares or Series B Shares; (y) any other shares of Common Stock held or
acquired (or which may be acquired upon the exercise or conversion of securities
for or into shares of Common Stock) by the Purchasers (other than any Individual
Purchaser) pursuant to any preemptive right, right of first refusal or
otherwise; and (z) any other shares of Common Stock issued in respect of any of
such securities (as a result of stock splits, stock dividends,
reclassifications, recapitalizations or other events); provided, however, that
                                                       --------  -------
such securities shall cease to be Registrable Securities upon (i) any sale
pursuant to a registration statement under the Act, (ii) any sale which is a
"brokers' transaction" pursuant to Rule 144 under the Act, or (iii) in the event
of any registration requested pursuant to Section 3, upon receipt by the Company
of a written opinion of independent counsel, a copy of which will be provided to
the holders of such securities, that such securities are freely tradeable
without registration pursuant to Rule 144(k) (or any successor thereto) under
the Act.

          (b) "Individual Registrable Securities" means (x) any shares Common
               ---------------------------------
Stock acquired by the Individual Purchasers; and (y) any other shares of Common
Stock issued in respect of any of such securities (as a result of stock splits,
stock dividends, reclassifications, recapitalizations or other events);
provided, however, that such securities shall cease to be Individual Registrable
--------  -------
Securities upon (i) any sale pursuant to a registration statement under the Act
or (ii) any sale which is a "brokers' transaction" pursuant to Rule 144 under
the Act.

          Section 5.  Blue Sky in Demand Registrations and Form S-3 Registration
                      ----------------------------------------------------------
Rights.  In the event of any registration pursuant to Section 1 or 3, the
------
Company will exercise its best efforts to register and qualify the securities
covered by the registration statement under such other securities or Blue Sky
laws of such jurisdictions as shall be required and reasonably appropriate for
the distribution of such securities expected to be sold by the underwriter in
such states; provided, however, that (a) the Company shall not be required to
qualify to do business or to file a general consent to service of process in any
such states or jurisdictions, and (b) notwithstanding anything in this Agreement
to the contrary, in the event any jurisdiction in which the securities shall be
qualified imposes a non-waivable requirement that expenses incurred in
connection with the qualification of the securities be borne by selling
stockholders, such expenses shall be payable pro rata by selling stockholders.

                                       4
<PAGE>

          Section 6.  Selection of Underwriter.  The underwriter of any offering
                      ------------------------
requested pursuant to this Agreement shall be selected by the Company.

          Section 7.  Registration Procedures.  If and whenever the Company is
                      -----------------------
required by the provisions of this Agreement to use its best efforts to effect
the registration of any of the Registrable Securities under the Act, the Company
shall:  (a) as expeditiously as possible (and, in the case of a registration
under Section 1, within 120 days of any request thereunder) file with the
Securities and Exchange Commission (the "Commission") a registration statement,
in form and substance required by the Act, with respect to such Registrable
Securities and use its best efforts to cause that registration statement to
become effective;

          (b) as expeditiously as possible, prepare and file with the Commission
any amendments and supplements to the registration statement and the prospectus
included in the registration statement as may be necessary to keep the
registration statement effective, in the case of a firm commitment underwritten
public offering, until completion of the distribution of all securities
described therein and, in the case of any other offering, until the earlier of
the sale of all Registrable Securities covered thereby or nine (9) months after
the effective date thereof;

          (c) as expeditiously as possible, furnish to the selling Purchasers,
such reasonable numbers of copies of the prospectus, including a preliminary
prospectus, in conformity with the requirements of the Act, and such other
documents as the selling Purchasers may reasonably request in order to
facilitate the public sale or other disposition of the Registrable Securities
owned by them;

          (d) in connection with each registration pursuant to Sections 1, 2 and
3 above covering an underwritten public offering, the Company and the selling
Purchasers agree to enter into a written agreement with the managing underwriter
in such form and containing such provisions (including, if the underwriter so
requests, customary contribution provisions on the part of the Company) as are
customary in the securities business for such an arrangement between such
underwriter and companies of the Company's size and investment stature, provided
that the selling Purchasers shall not be obligated to enter into any such
underwriting agreement if the indemnification provisions thereof are more
burdensome on the selling Purchasers than those contained herein;

          (e) at the request of the selling Purchasers, the Company will furnish
to each underwriter, if any, and the selling Purchasers, a legal opinion of its
counsel and a letter from its independent certified public accountants, each in
customary form and substance, at such time or times as such documents are
customarily provided in the type of offering involved provided that furnishing
such documents does not require any information or opinions other than as
provided in the underwriting agreement for the Company's initial public
offering;

          (f) whenever the Company is registering any Common Stock under the Act
and any Purchaser is selling securities under such registration or determines
with the opinion of its counsel, that it may be a controlling person under the
Act, the Company will keep the selling

                                       5
<PAGE>

Purchaser advised in writing of the initiation, progress and completion of such
registration, will allow the selling Purchaser and its counsel to participate,
at the sole expense of the selling Purchaser, in the preparation of the
registration statement and to have access to all relevant corporate records,
documents and information, not inconsistent with the information that the
Company includes in the registration statement, will include in the registration
statement such information as the selling Purchaser may reasonably request and
will take all such other action as the selling Purchaser may reasonably request;

          (g) the selling Purchasers shall furnish to the Company such
information regarding the selling Purchasers and the distribution proposed by
them as the Company may reasonably request in writing and as shall be required
in connection with the registration, qualification or compliance referred to in
this Agreement;

          (h) as of the effective date of any registration statement relating
thereto, cause all such Registrable Securities and/or Individual Registrable
Securities to be listed on each securities exchange or Nasdaq system on which
Common Stock of the Company are then listed; and

          (i) as of the effective date of any registration statement relating
thereto, provide a transfer agent for all Registrable Securities and Individual
Registrable Securities.

          Section 8.  Expenses.  The Company will pay all expenses incurred by
                      --------
the Company in complying with this Agreement, including, without limitation, all
registration and filing fees, exchange listing fees, printing expenses, transfer
taxes, fees and expenses of counsel for the Company and the reasonable fees (up
to $50,000 for each registration) and expenses of one counsel selected by the
selling Purchasers reasonably acceptable to the Company to be included in such
registration to represent them, and state Blue Sky fees and expenses, but
excluding underwriting discounts and selling commissions relating to the sale of
the Registrable Securities and/or Individual Registrable Securities, and the
expenses of the Purchasers to the extent the Purchasers are only participating
pursuant to Section 7(f).

          Section 9.  Notification.  The Company shall promptly notify  the
                      ------------
selling Purchasers of any event which results in the prospectus included in such
registration statement, as then in effect, containing an untrue statement of a
material fact or omitting to state a material fact required to be stated therein
or necessary to make the statements therein not misleading in the light of the
circumstances then existing, and the Purchasers will immediately discontinue any
sales of the Company's securities upon such notice until an amendment or
supplement has been prepared and filed (and effective in the case of a post-
effective amendment).

          Section 10.  Indemnification and Contribution.  (a) Indemnification by
                       --------------------------------       ------------------
the Company.  The Company shall indemnify and hold harmless each of the
-----------
Purchasers, their respective officers, directors, employees, partners and
members, each underwriter of the Registrable Securities and/or Individual
Registrable Securities being sold by the Purchasers, and each controlling person
of any of the foregoing, against all claims, losses, judgments, damages and
liabilities (or actions in respect thereof) arising out of or based on any
untrue statement (or

                                       6
<PAGE>

alleged untrue statement) of a material fact contained in any prospectus,
offering, circular, or other document relating to such Registrable Securities
and/or Individual Registrable Securities (or in any related registration
statement) or any omission (or alleged omission) to state therein a material
fact required to be stated therein or necessary to make the statements therein
not misleading, or any violation by the Company of the Act, or the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), or any applicable state
securities laws, or any rule or regulation promulgated thereunder, applicable to
the Company and relating to action or inaction required of the Company in
connection with any registration, qualification or compliance contemplated by
this Agreement, and will reimburse the Purchasers, each of their officers,
directors, employees, partners and members, and each such underwriter and
controlling person for any legal or any other expenses reasonably incurred in
connection with investigating or defending any such claim, loss, damage,
liability or action; provided, however, that the Company will not be liable in
any such case to the extent that any such claim, loss, damage or liability (i)
arises out of or is based on any untrue statement or omission based upon and in
conformity with written information furnished to the Company by or on behalf of
the Purchasers and stated to be specifically for use in any prospectus,
offering, circular or any amendments or supplements thereto after the Company
has furnished the Purchasers with a sufficient number of copies thereof, or (ii)
results solely from the failure of the Purchasers to deliver a copy of the
prospectus, offering circular or any amendments or supplements thereto after the
Company has furnished the Purchasers with a sufficient number of copies thereof.

          (b) Indemnification by the Purchasers. Each Purchaser, severally and
              ---------------------------------
not jointly, shall indemnify and hold harmless the Company, its directors, its
officers, each underwriter of the Registrable Securities and/or Individual
Registrable Securities, and each controlling person of any of the foregoing,
against all claims, losses, judgments, damages and liabilities (or actions in
respect thereof) arising out of or based on any untrue statement (or alleged
untrue statement) of a material fact contained in any prospectus, offering
circular, or other document relating to the Registrable Securities and/or
Individual Registrable Securities (or in any related registration statement) or
any omission (or alleged omission) to state therein a material fact required to
be stated therein or necessary to make the statements therein not misleading or
the failure of such Purchaser to deliver a copy of the prospectus, offering
circular, or any amendments or supplements thereto, and will reimburse the
Company and each such director, officer or controlling person for any legal or
any other expenses reasonably incurred in connection with investigating or
defending any such claim, loss, damage, liability or action; provided, however,
                                                             --------  -------
that no Purchaser will be liable in any such case except to the extent that any
such claim, loss, damage or liability arises out of any untrue statement or
omission based upon and in conformity with written information furnished to the
Company by or on behalf of such Purchaser and stated to be specifically for use
therein; provided, further, that in no event shall any indemnity by any
         --------  -------
Purchaser under this subsection 10(b), together with any amount payable under
subsection 10(d), exceed the net proceeds from the offering received by such
Purchaser.

          (c) Procedures for Indemnification.  Each party entitled to
              ------------------------------
indemnification under Subsection (a) or (b) (the "Indemnified Party") shall give
notice to the party required to provide indemnification (the "Indemnifying
Party") promptly after such Indemnified Party has actual knowledge of any claim
as to which indemnity may be sought, and shall permit the

                                       7
<PAGE>

Indemnifying Party to assume the defense of any such claim or any litigation
resulting therefrom; provided, that counsel for the Indemnifying Party, who
shall conduct the defense of such claim or any litigation resulting therefrom,
shall be approved by the Indemnified Party (whose approval shall not be
unreasonably withheld or delayed); and, provided, further, that the failure of
any Indemnified Party to give notice as provided herein shall not relieve the
Indemnifying Party of its obligations under this Agreement. The Indemnified
Party may participate in such defense at such party's expense; provided,
however, that the Indemnifying Party shall pay such expense if in the written
opinion of counsel to the Indemnified Party reasonably acceptable to the
Indemnifying Party, such counsel shall believe in good faith that representation
of such Indemnified Party by the counsel retained by the Indemnifying Party
would be inappropriate due to actual or potential differing interests between
the Indemnified Party and any other party represented by counsel to the
Indemnifying Party in such proceeding. No Indemnifying Party, in the defense of
any such claim or litigation shall, except with the consent of each Indemnified
Party, consent to entry of any judgment or enter into any settlement which does
not include as an unconditional term thereof the giving by the claimant or
plaintiff to such Indemnified Party of a release from all liability in respect
of such claim or litigation, and no Indemnified Party shall consent to entry of
any judgment or settle for monetary amounts such claim or litigation without the
prior written consent of the Indemnifying Party.

          (d) Contribution.  If the indemnification provided for in Subsections
              ------------
10(a) or (b) is unavailable to any Indemnified Party thereunder in respect of
any losses, claims, damages or liabilities (or actions in respect thereof)
referred to in such Sections, then each person or entity that would have been an
Indemnifying Party thereunder shall contribute to the amount paid or payable by
such Indemnified Party as a result of such losses, claims, damages or
liabilities (or actions in respect thereof) in such proportion as is appropriate
to reflect the relative benefits received by the Indemnifying Party on one hand
and such Indemnified Party on the other and also the relative fault of the
Indemnifying Party on the one hand and such Indemnified Party on the other.  The
relative fault shall be determined by reference to, among other things, whether
any untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by the
Indemnifying Party or such Indemnified Party, and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
statement or omission, or whether such losses, claims, damages or liabilities
(or actions in respect thereof) arose out of the action or failure to act of one
or more of such parties.  Notwithstanding the foregoing, (i) the Purchasers will
not be required to contribute any amount in excess of the net proceeds to the
Purchasers of all Registrable Securities and Individual Registrable Securities
sold by them pursuant to such registration statement, and (ii) no person or
entity guilty of fraudulent misrepresentation, within the meaning of Section
11(f) of the Act, shall be entitled to contribution from any person or entity
who is not guilty of such fraudulent misrepresentation.

          Section 11.  Reports Under Exchange Act.  With a view to making
                       --------------------------
available to the Purchasers the benefits of Rule 144 promulgated under the Act
and any other rule or regulation of the Commission that may at any time permit a
holder to sell securities of the Company to the public without registration or
pursuant to a registration on Form S-3, the Company agrees to use its best
efforts to satisfy the requirements applicable to the Company of all such rules
and

                                       8
<PAGE>

regulations (including the requirements for public information, registration
under the Exchange Act and timely reporting to the Commission) at the earliest
possible date (but in any event not later than 90 days) after the effective date
of the registration statement for its first registered public offering.  The
Company will furnish to the Purchasers whenever reasonably requested, a written
statement as to its compliance with the reporting requirements of Sections 13 or
15(d) under the Exchange Act, a copy of its most recent annual or quarterly
report, and such other reports and information filed by the Company as the
Purchasers may reasonably request in connection with the sale of Registrable
Securities and/or Individual Registrable Securities without registration.

          Section 12.  Registration Rights of Others.  The Company will not,
                       -----------------------------
without the prior written consent of the holders of a majority of the
Registrable Securities, grant to any other person or entity the right to (a)
require the Company to initiate the registration of any securities or (b)
require the Company to include in any registration, securities owned by such
holder, unless under the terms of such arrangement, such holder may include
securities in such registration only to the extent that the inclusion thereof
does not limit the number of Registrable Securities included therein or
adversely affect the offering price thereof; provided, that the Company may
                                             --------
grant such rights, subject to the conditions set forth in this Section 12, to
any purchaser of more than 15% of the Company's outstanding capital stock, on a
fully diluted basis.  The Company represents and warrants that it has not
granted any person or entity the right to require the Company to initiate the
registration of any securities or include in any registration any securities
owned by such holder, except as provided herein or disclosed in the Purchase
Agreement, the CIH Purchase Agreement, the Merger Agreement or the Series B
Purchase Agreement.

          Section 13.  Lock-Up Agreement.  Each holder of Registrable Securities
                       -----------------
and Individual Registrable Securities agree that in connection with the initial
public offering of Common Stock and any subsequent public offering of Common
Stock in which shares of Registrable Securities and Individual Registrable
Securities are entitled to be included in such public offering by the terms
hereof, and upon the request of the managing underwriter in such offering, such
holder will not sell, grant any option for the purchase of, or otherwise dispose
of any of the Company's securities held by such holder (other than any included
in such registered offering, any purchased in a public offering by the Company
or any purchased in the open market) without the prior written consent of such
underwriter, for such period of time as may be requested by such underwriter
(not to exceed (a) 180 days after the effective date of such registration, in
the case of the initial public offering of Common Stock, (b) 90 days after the
effective date of such registration, in the case of the second registration of
the Company's common stock or (c) the amount of time negotiated with the
underwriter, not to exceed 90 days, in the case of any other registration).  The
obligation of the Purchasers under this Section 13 is conditional upon the
agreement of all of the Company's executive officers and directors and of all
persons holding 5% or greater of the Company's capital stock to be bound by the
terms of this Section 13.

          Section 14.  Insider Trading Policy.  At all times during which the
                       ----------------------
Company is subject to the reporting requirements of the Act, the Company will
use its reasonable best efforts to establish and maintain an internal policy
with respect to officers, directors, employees and

                                       9
<PAGE>

related persons and entities who possess material, non-public information of the
Company or any of its Subsidiaries (each, an "Insider") in which (a) such
Insiders are permitted to trade in the Company's equity securities only during
the period commencing forty-eight (48) hours after the public release of
quarterly or annual earnings and ending immediately preceding the fifteenth
(15th) calendar day before the end of the next fiscal quarter; and (b)
notwithstanding clause (a) above, such Insiders may not, at any time, directly
or indirectly, purchase, sell or engage in any derivative or other transaction
involving any equity security issued by the Company if at the time of such
transaction such Insider is in possession of material, non-public information
about the Company.

          Section 15.  Notices.  All notices, demands, requests or other
                       -------
communications hereunder shall be in writing and shall be deemed to have been
duly given if delivered in person, or by United States mail, certified or
registered with return receipt requested, or by nationally recognized overnight
courier service,  to the addresses of the respective parties for notices in
accordance with the Purchase Agreement, the Stock Purchase Agreement dated March
16, 1999 between the Company, Daniel Nissanoff and Seacoast, the CIH Purchase
Agreement, the Merger Agreement or the Series B Agreement.

          Section 16.  Successors and Assigns.  This Agreement shall be binding
                       ----------------------
upon and inure to the benefit of the parties hereto and, with respect to the
Company, its successors and assigns, and with respect to the Purchasers, any
Permitted Transferee (as defined below) or Full Transferee (as such term is
defined in the Third Amended and Restated Stockholders Agreement dated as of
this date) of a Purchaser.  As used herein, "Permitted Transferee" means a
partner, member, officer, director or affiliate of a Purchaser, including,
without limitation any affiliated investment fund.

          Section 17.  Survival.  This Agreement, including without limitation
                       --------
the obligation of the parties under Section 10 hereof, shall survive
indefinitely.

          Section 18.  Severability and Governing Law.  If any provision of this
                       ------------------------------
Agreement is rendered void, invalid or unenforceable by any court of law for any
reason, such invalidity or unenforceability shall not void or render invalid or
unenforceable any other provision of this Agreement.  This Agreement is governed
by and construed in accordance with the internal laws of the State of New York.

          Section 19.  Amendments, Etc.  This Agreement may be changed, waived,
                       ---------------
discharged or terminated only with the written consent of the Company and the
holders of 75% the Registrable Securities; provided, that no amendment of this
                                           --------
Agreement which has a disproportionate adverse effect on a particular holder of
Registrable Securities shall be effective against such holder unless consent to
by such holder.

          Section 20.  Counterparts.  This Agreement may be executed in one or
                       ------------
more counterparts, and with counterpart signature pages, each of which shall be
an original, and all of which together shall constitute one in the same
Agreement.

                                       10
<PAGE>

     Section 21.  Transfer of Rights.  Notwithstanding anything in this
                  ------------------
Agreement and the Series B Purchase Agreement, dated as of the date hereof, to
the contrary, any rights to cause the Company to register securities may be
transferred or assigned by any Purchaser to any affiliate of such Purchaser;
provided, that the Company is given written notice at the time of or within a
--------
reasonable time after said transfer or assignment, stating the name and address
of such transferee or assignee and identifying the specific rights being
transferred or assigned; and, provided, further, that such transferee or
                              --------  -------
assignee assumes the obligations of the transferring Purchaser under the
applicable transaction agreement and agrees to be bound thereby and hereby.

     Section 22.  Aggregation of Stock.  All shares of Registrable Securities
                  --------------------
held or acquired by affiliated entities or persons shall be aggregated together
for the purpose of determining the availability and extent of any rights under
this Agreement.

                                       11
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as a sealed instrument as of the date first above written.

                                    PARTMINER, INC.

                                    By: /s/ Daniel Nissanoff
                                        -----------------------------
                                        Name:

                                    BOSTON VENTURES LIMITED
                                    PARTNERSHIP V
                                    By:  Boston Ventures Management, Inc.

                                    By: /s/ James Wilson
                                        -----------------------------
                                        Name:  James Wilson

                                    VULCAN SECURITIES LIMITED

                                    By: /s/ Michael von Staudt
                                        -----------------------------
                                        Name:  Michael von Staudt

                                    SEACOAST CAPITAL PARTNERS
                                    LIMITED PARTNERSHIP
                                    By:  Seacoast I Advisors LLC,
                                           its General Partner

                                    By: /s/ Eben S. Moulton
                                        -----------------------------
                                        Name:

                                    SEACOAST INVESTORS LLC

                                    By: /s/ Eben S. Moulton
                                        -----------------------------
                                        Name:

                                    CAHNERS INFORMATION HOLDINGS, INC.

                                    By: /s/ Charles Fontaine
                                        -----------------------------
                                        Name:
<PAGE>

                                    INFORMATION HANDLING SERVICES INC.

                                    By: /s/ L. Christopher Meyer
                                        ------------------------------
                                        Name:  L. Christopher Meyer

                                        /s/ Emil H. Dahan
                                        ------------------------------
                                        Emil H. Dahan

                                        /s/ Michael J. Galvin
                                        ------------------------------
                                        Michael J. Galvin

                                        /s/ Patricia Tuxbury Salem
                                        ------------------------------
                                        Patricia Tuxbury Salem

                                        /s/ Peter W. Jeng
                                        ------------------------------
                                        Peter W. Jeng

                                        /s/ James L. McAlarney III
                                        ------------------------------
                                        James L. McAlarney III

                                    IHD-PM, LLC

                                    By: /s/ Emil H. Dahan
                                        ------------------------------
                                        Name:  Emil H. Dahan

                                    INTEGRAL CAPITAL PARTNERS IV, L.P.

                                    By: Integral Capital Management IV, LLC,
                                        its General Partner

                                    By: /s/Pamela K. Hagenah
                                        ------------------------------
                                        Name:  Pamela K. Hagenah
                                        Title: Manager
<PAGE>

                                    INTEGRAL CAPITAL PARTNERS IV,
                                      MS SIDE FUND, L.P.

                                    By:  Integral Capital Partners NBT, LLC,
                                         its General Partner

                                    By: /s/ Pamela K. Hagenah
                                        -----------------------------
                                        Name:  Pamela K. Hagenah
                                        Title: Manager

                                    AGILE SOFTWARE CORP.

                                    By: /s/ Thomas P. Shanahan
                                        -----------------------------
                                        Name:

                                    IMPACT VENTURE PARTNERS L.P.

                                    By: /s/ Adam Dell
                                        -----------------------------
                                        Name:

                                    OMI PARTNERSHIP HOLDINGS LTD.

                                    By: /s/ A. R. Melman
                                        -----------------------------
                                        Name:

                                    GENERATION CAPITAL PARTNERS PARTNERS L.P.

                                    By:  Generation Partners L.P., as General
                                         Partner

                                         By:  Generation Capital Company LLC,
                                         as General Partner

                                         By: /s/ Mark Jennings
                                             -------------------------
                                             Mark Jennings
                                             Managing Director
<PAGE>

                                    STATE BOARD OF ADMINISTRATION OF FLORIDA

                                    By:  Generation Parallel Management
                                         Partners L.P., as Manager

                                         By:  Generation Capital Company LLC,
                                         as General Partner

                                         By: /s/ Mark Jennings
                                             ------------------------
                                             Mark Jennings
                                             Managing Director

                                    GENERATION PARALLEL MANAGEMENT PARTNERS L.P.

                                    By:  Generation Capital Company LLC,
                                         as General Partner

                                         By: /s/ Mark Jennings
                                             ------------------------
                                             Mark Jennings
                                             Managing Director

                                    BROADVIEW SLP

                                    By: /s/ Peter Mooney
                                        -----------------------------
                                        Name:  Peter Mooney

                                    THE GOLDMAN SACHS GROUP, INC.

                                    By: /s/ Joseph Gleberman
\                                       -----------------------------
                                        Name:  Joseph Gleberman, V.P.

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