Document:

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                                                                     EXHIBIT 4.4

* Represents confidential information for which Ariba, Inc. is seeking
  confidential treatment with the Securities and Exchange Commission.

                FIRST AMENDED AND RESTATED SHAREHOLDERS AGREEMENT

                                  BY AND AMONG

                                 SOFTBANK CORP.

                           SOFTBANK EC HOLDINGS CORP.

                                   ARIBA, INC.

                                       AND

                                NIHON ARIBA K.K.

                                DECEMBER 10, 2001

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                                TABLE OF CONTENTS

                                                                        Page No.

1       Definitions ...................................................... 1
2       The Company ...................................................... 5
3       Operation of the Company ......................................... 5
4       Board ............................................................ 5
5       Representative Director; Key Officers ............................ 6
6       Statutory Auditors ............................................... 7
7       Shareholders' Meetings ........................................... 7
8       Financial Statements and Accounting Records ...................... 7
9       Right Of Inspection .............................................. 7
10      Softbank Rights .................................................. 8
11      Company Interests ................................................ 8
12      Annual Business Plan ............................................. 8
13      Transfer Restrictions ............................................ 9
14      "Market Stand-Off" Agreement .....................................10
15      Exclusivity ......................................................10
16      Co-Sale Rights ...................................................12
17      Additional Capital ...............................................12
18      Right of First Offer .............................................12
19      IPO Commitment ...................................................14
20      Certain Breaches. ................................................14
21      Modification of Transaction Agreements. ..........................15
22      Representations and Warranties of SOFTBANK
        and SOFTBANK Parent ..............................................16
23      Representations and Warranties of Ariba ..........................17

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24      Effectiveness, Term and Termination ..............................18
        24.1    Term .....................................................18
        24.2    Termination ..............................................18
        24.3    Continuing Liability .....................................19
25      Incidental and Consequential Damages .............................19
26      Miscellaneous ....................................................19
        26.1    Governing Law; Dispute Resolution ........................19
        26.2    Notices and Other Communications .........................20
        26.3    Language .................................................22
        26.4    Severability .............................................22
        26.5    References; Subject Headings .............................22
        26.6    Further Assurances .......................................22
        26.7    Expenses .................................................22
        26.8    No Waiver ................................................22
        26.9    Entire Agreement; Amendments .............................23
        26.10   Assignment ...............................................23
        26.11   No Agency ................................................23
        26.12   No Beneficiaries .........................................23
        26.13   Counterparts .............................................23

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     This First Amended and Restated Shareholders Agreement (this "Agreement")
is made as of December 10, 2001 (the "Amendment Date"), by and among Nihon Ariba
K.K., a Japanese corporation (the "Company"), Ariba, Inc., a Delaware
corporation ("Ariba"), SOFTBANK Corp., a Japanese corporation ("SOFTBANK
Parent"), and SOFTBANK EC Holdings Corp., a Japanese corporation previously
known as SOFTBANK E-Commerce Corp. and a direct wholly owned subsidiary of
SOFTBANK Parent ("SOFTBANK"). The Company, Ariba, SOFTBANK Parent and SOFTBANK
are hereunder also referred to collectively as the "Parties" and individually as
a "Party". This Agreement supercedes and replaces the SHAREHOLDERS AGREEMENT
between the Parties dated as of October 19, 2000 (the "Prior Agreement"), which
the Parties hereby agree is amended and restated in its entirety by this
Agreement as of the Amendment Date.

                                    RECITALS

     WHEREAS, concurrently herewith, the Parties are amending and/or entering
into other agreements relating to the business and affairs of the Company; and

     WHEREAS, the Parties desire to amend and restate the Prior Agreement as
provided herein and to accept the rights and obligations created pursuant hereto
in lieu of the rights and obligations accepted by them under the Prior
Agreement.

     NOW THEREFORE, for valuable consideration, the receipt and adequacy of
which are hereby acknowledged, the Parties hereby agree as follows:

                                    AGREEMENT

          1. Definitions.

     1.1 "[*]" shall mean a Person, of which securities representing at least
[*] of the ordinary voting power is or, in the case of a partnership, at least
[*] of the general partnership interests are, directly or indirectly owned,
controlled or held by the Party on such date.

     1.2 "[*]" shall mean a Person that directly or indirectly owns, controls,
or holds securities representing at least [*] of the ordinary voting power or,
in the case of a partnership, at least [*] of the general partnership interests
of the Party on such date.

     1.3 "Affiliate" of a Person means any Person that is controlled by,
controls, or is under common control with the first Person, in each case for so
long as such control continues; provided, however, that Affiliates of any Person
shall include Persons in which the first Person owns, directly or indirectly,
shares representing at least [*] of the voting power represented by such
Affiliates' outstanding shares, regardless of whether such control actually
exists. For purposes of this definition, "control" shall mean the possession,
directly or indirectly, of power to direct or cause the direction of management
or policies of a Person (whether through ownership of securities or other
ownership interests, by contract or otherwise).

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     1.4 "Annual Business Plan" means the Company's annual business plan, as
approved by the Board each year for the Company's next succeeding year
including, among other things, (i) a budget for the upcoming fiscal year for
anticipated revenues and expenses of the Company, (ii) an expenditure budget,
(iii) a cash-flow forecast and (iv) the[*].

     1.5 "Ariba" is defined in the preambles of this Agreement.

     1.6 "Ariba Company Interest" means the Company Interest of Ariba.

     1.7 "Ariba Investor" means Ariba and each Person that is an Affiliate of
Ariba to whom Securities owned by Ariba at the close of business on the
Effective Date and subsequently acquired by Ariba pursuant to Section 11 or 18
of this Agreement have been Transferred pursuant to this Agreement.

     1.8 "Ariba Non-Disclosure Agreement" means the Non-Disclosure Agreement by
and between Ariba, SOFTBANK Parent and SOFTBANK dated October 19, 2000.

     1.9 "Articles" means the articles of incorporation of the Company in the
form of attached Exhibit 2.1 to the Stock Purchase Agreement, as the same may be
amended from time to time in accordance with this Agreement and the Commercial
Code.

     1.10 "Board" means the board of directors of the Company.

     1.11 "Business" generally means [*] and (iii) any business ancillary
thereto.

     1.12 "Business Day" means a day on which commercial banks in the United
States and Japan are generally open to conduct their regular banking business.

     1.13 "Company" is defined in the preambles of this Agreement.

     1.14 "Chief Executive Officer" means the Chief Executive Officer of the
Company.

     1.15 "Co-Sale Shareholder" is defined in Section 16(a).

     1.16 "Commercial Code" means the Commercial Code of Japan, as amended and
in effect from time to time.

     1.17 "Committee" is defined in Section 19(b).

     1.18 "Common Stock" means common stock of the Company as authorized by the
Articles.

     1.19 "Company Interest" shall mean, for a Party, the percentage interest
represented by the number of Securities then held by such Party (assuming that
such

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Party has not Transferred any Securities) divided by the number of then
outstanding Fully Diluted Securities.

     1.20 "[*]" is defined in Section 21(a).

     1.21 "Director" means a member of the Board.

     1.22 "Effective Date" means the Closing Date (as defined in the Stock
Purchase Agreement).

     1.23 "Fully Diluted Securities" means the number of Securities outstanding
on a fully diluted basis after (i) giving effect to the exchange, exercise and
conversion of all outstanding exchangeable, exercisable and convertible
Securities and (ii) including all shares of Common Stock reserved and available
for the grant of options and or stock purchase rights to employees, officers,
directors and consultants of the Company that are not subject to outstanding
options.

     1.24 "Investor" means each [*] and each [*].

     1.25 "IPO" is defined in Section 19(a).

     1.26 "Key Officers" means those Company officers who are in management
positions reporting directly to the Chief Executive Officer.

     1.27 "[*]" is defined in Section 15(a).

     1.28 "Litigation Committee" is defined in Section 20.

     1.29 "Meeting Notice" is defined in Section 4(c).

     1.30 "Modification Event" means the occurrence of the written notice by
Ariba to SOFTBANK pursuant to Section 21(b), except as otherwise provided in
Section 21(b).

     1.31 "Notice" is defined in Section 18(b).

     1.32 "[*]" is defined in Section 16(a).

     1.33 "Offered Securities" is defined in Section 18(b).

     1.34 "Party" and "Parties" are defined in the preamble of this Agreement.

     1.35 "Percentage Interest" is defined in Section 15(b).

     1.36 "Performance Criteria" is defined in Section 21(d).

     1.37 "Person" means a natural individual, partnership, firm, corporation,
or other entity or form of business association.

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     1.38 "Related Party Transaction" is defined in Exhibit 4(d).

     1.39 "Release" means the Release, Reimbursement and Payment Agreement dated
as of the Amendment Date among the Parties.

     1.40 "Representative Director" means a representative director of the
Company with the powers and duties specified for a representative director of a
corporation in the Commercial Code or the Articles.

     1.41 "Schedule" is defined in Section 15(a).

     1.42 "Securities" means all outstanding shares of Common Stock and any
other equity securities of the Company or instruments exercisable or
exchangeable for or convertible into Common Stock or other equity securities of
the Company.

     1.43 "SOFTBANK" is defined in the preambles of this Agreement.

     1.44 "Softbank Company Interest" means the sum of the Company Interests of
SOFTBANK and SOFTBANK Parent.

     1.45 "Softbank Investor" means SOFTBANK, SOFTBANK Parent and each Person
that is an Affiliate of SOFTBANK Parent to whom Securities acquired by SOFTBANK
and SOFTBANK Parent on the Effective Date pursuant to the Stock Purchase
Agreement and subsequently acquired by SOFTBANK and SOFTBANK Parent pursuant to
Section 11 or 18 of this Agreement have been Transferred pursuant to this
Agreement.

     1.46 "SOFTBANK Parent" is defined in the preambles of this Agreement.

     1.47 "Special Exceptions Law" means the law pertaining to special
exceptions to the Commercial Code concerning auditors of companies (Kabushiki
Kaisha).

     1.48 "Statutory Auditor" means a statutory auditor (Kansa-yaku) of the
Company with powers and duties as specified in the Commercial Code.

     1.49 "Stock Purchase Agreement" means the Stock Purchase Agreement dated as
of October 19, 2000, as amended by Amendment No. 1 to Stock Purchase Agreement
dated as of the Amendment Date, among the Company, SOFTBANK Parent and SOFTBANK.

     1.50 "Subject Affiliate" is defined in Section 15(a).

     1.51 "Term" is defined in Section 24.1.

     1.52 "Transaction Agreements" means the Stock Purchase Agreement by and
among the Company, Softbank Parent and Softbank dated October 19, 2000, as
amended by Amendment No. 1 to Stock Purchase Agreement by and among the Company,
SOFTBANK Parent and SOFTBANK dated as of the Amendment Date; First Amended and

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Restated Shareholders Agreement by and among SOFTBANK Parent, SOFTBANK, Ariba
and the Company dated as of the Amendment Date; Distribution Agreement by and
between the Company and Ariba dated as of the Amendment Date; Amended and
restated letter agreement by and between Ariba and SOFTBANK Parent dated as of
the Amendment Date (the "Letter Agreement"); Standby Purchase Agreement by and
among SOFTBANK, the Company, and Ariba dated as of the Amendment Date; and the
Amended Master Alliance Agreement by and between the Company and Softbank
Commerce Corporation dated as of the Amendment Date, including the Attachment
for Reselling of the same date and the Addendum to the Attachment for Reselling;
Appointment of Dealers of the same date.

     1.53 "Transfer" is defined in Section 13(a).

     2. The Company. The Parties hereby acknowledge that the purpose of the
Company shall be to establish and develop the Business.

     3. Operation of the Company. Each Party agrees to take all actions
necessary to ensure that the Company shall be operated in accordance with the
terms of this Agreement and the other Transaction Agreements, including, without
limitation, to vote all Securities held by it (and to cause all Securities held
by any of its Affiliates and permitted transferees under Section 13 to be voted)
to effect the terms hereof.

     4. Board.

          (a) Board of Directors. The Company will be managed by the Board in
     accordance with the terms of this Agreement and applicable law. The Board
     shall consist of [*] Directors, [*] of whom shall be nominated by [*] and
     [*] of whom shall be nominated by [*]. One of the Directors nominated by
     [*] shall be the [*]. If the [*] at any time decreases to less than [*],
     the Parties shall upon written notice from [*] cause the Board constituency
     to be adjusted so that only [*] nominated by [*] within thirty (30) days of
     such written notice. If the [*] at any time decreases to less than [*], the
     Parties shall upon written notice from [*] cause the Board constituency to
     be adjusted so that [*] nominated by [*], within thirty (30) Business Days
     of such written notice, unless the [*] shall continue to hold at least [*]
     of the Securities acquired by the [*] pursuant to the Stock Purchase
     Agreement and pursuant to Sections 11 and 18 of this Agreement.

          (b) Removal; Reappointment of Directors. Any Director may be removed
     for cause in accordance with applicable law. In addition, each Party having
     the right to appoint a Director pursuant to this Section 4 shall also have
     the right, in its sole discretion, to remove such Director at any time by a
     written notice to the Company and the other Party, in which event the Party
     which nominated the Director in question shall cause such Director to
     deliver a written resignation to the Company. In the case of a vacancy in
     the office of a Director for any reason (including removal pursuant to the
     preceding sentence), the vacancy shall be filled by the Party that
     nominated or has the right to nominate the Director in question, subject to
     obtaining the approval of a majority of the remaining Directors.

          (c) Board Meetings. Each Director shall have the authority to convene
     Board meetings, including the authority to specify the time and place of
     such meetings

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     (with video conference or any other legally permitted means of meeting
     under the Commercial Code to be permitted at the request of any Director);
     provided, however, that (i) the Board shall meet at least once during each
     calendar quarter and (ii) written notice of each Board meeting (a "Meeting
     Notice") shall be given not less than ten (10) Business Days in advance of
     the meeting date (which ten (10) Business Day period may be shortened if
     each Director either (A) grants a written waiver of notice of such meeting
     or (B) actually attends such meeting, without objection). All Meeting
     Notices shall include a proposed agenda listing the items to be discussed
     at such Board meeting. Board meetings shall be conducted in the English
     language (with Japanese interpretation) and minutes of such meetings shall
     be prepared by the Company in English and Japanese and distributed to each
     Director promptly following a meeting. In the event of conflict or
     controversy between versions, the English version of the minutes shall
     control. Proposals or reports brought before any Board or shareholders'
     meeting for information or action (including without limitation the
     Company's annual and semi-annual financial statements) shall be prepared in
     English and Japanese. In the event of conflict or controversy, the English
     version thereof shall control. Any and all reasonable travel costs
     (including without limitation business class air travel) and expenses
     incurred for purposes of attendance by a Party's Directors at Board
     meetings held outside the country where the Party's corporate headquarters
     is located shall be reimbursed by the Company.

          (d) Board Quorum, Resolutions. A quorum shall be deemed to exist for
     purposes of Board actions so long as at least four (4) Directors are
     present, including one (1) Director appointed by SOFTBANK and one (1)
     Director appointed by Ariba. If no Director nominated by SOFTBANK or no
     Director nominated by Ariba attends a duly noticed Board meeting, such
     meeting shall be immediately adjourned and rescheduled, and written notice
     of such rescheduled meeting shall be delivered to the Directors not less
     than five (5) Business Days in advance of the rescheduled meeting. If the
     number of Directors who attend such rescheduled meeting is not sufficient
     to constitute a quorum under the first sentence of this Section 4(d), a
     quorum shall be deemed to exist for purposes of the rescheduled meeting
     notwithstanding such non-attending Directors' absence so long as there is a
     sufficient number of directors present to constitute a valid quorum
     pursuant to the Commercial Code. Any action, determination or resolution of
     the Board shall require the affirmative vote of a majority of Directors
     present at a meeting at which a valid quorum pursuant to this Section 4(d)
     is present. Notwithstanding the foregoing, the matters set forth on [*]
     shall additionally require the affirmative vote of at least [*] appointed
     by [*] or [*], provided that at the time such vote is sought the [*] hold
     at least [*] of the Securities acquired by the [*] pursuant to the Stock
     Purchase Agreement and pursuant to Sections 11 and 18 of this Agreement.

     5. Representative Director; Key Officers. [*] shall designate [*]
Representative Directors of the Company in accordance with the Commercial Code,
one of whom shall be the [*]. [*] shall have the right to approve the [*] and
the [*] in its sole discretion upon prior consultation with [*]. [*] shall also
have the right, exercisable in its sole discretion upon prior consultation with
[*], (i) to remove and replace the [*] or any [*] at any time and (ii) to
appoint a successor [*] or [*] in the event a vacancy arises for any reason, in
each case effective upon the delivery of written notice to the [*] or the [*]
and the other Parties. Each Party agrees to cause the Directors nominated by it
to take appropriate action by the Board to effect any such removal, replacement
or appointment.

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     6. Statutory Auditors. The Company shall have three (3) Statutory Auditors
whom shall be nominated by Ariba. A Statutory Auditor may be removed for cause
in accordance with applicable law. Ariba shall also have the right, exercisable
in its sole discretion, to remove and replace a Statutory Auditor at any time,
effective upon the delivery of written notice to the Statutory Auditor to be
removed and the other Parties. Ariba shall also further have the right to
appoint a successor Statutory Auditor in the event a vacancy arises for any
reason.

     7. Shareholders' Meetings. Shareholders of the Company shall receive notice
of each shareholders' meeting at least ten (10) Business Days before the
scheduled date of such meeting. The Company shall have at least one
shareholders' meeting each calendar year. Such meeting will take place at such
time and place as is determined by the Board. Meetings shall be conducted in the
English language (with Japanese translation to the extent requested by SOFTBANK
paid for by the Company), and minutes of such meetings shall be prepared by the
Company in English and Japanese. In the event of conflict or controversy, the
English version of the minutes shall control.

     8. Financial Statements and Accounting Records. Financial statements for
the Company, including without limitation a balance sheet, income statement,
statement of cash flows and statement of shareholders' equity, shall be
submitted by the Company to each of the other Parties (i) within sixty (60) days
after the end of each fiscal quarter for such quarter, and (ii) within ninety
(90) days after the end of each fiscal year for such year. Each of the annual
financial statements shall be audited and certified by an internationally
recognized accounting firm (which will act as an independent auditor under the
Special Exceptions Law) retained by the Company. All financial statements shall
be (i) prepared in accordance with generally accepted accounting principles in
Japan and (ii) in reasonable detail and shall contain such financial data as
Ariba, SOFTBANK Parent and SOFTBANK reasonably request in order to keep each of
them advised of the Company's financial status (although quarterly statements
need not include footnotes and may be subject to year-end adjustments).

     9. Right Of Inspection. During office hours of the Company, and upon
reasonable notice to the Company, each of SOFTBANK, SOFTBANK Parent and Ariba
shall have full access to all properties, books of account, and records of the
Company, and each such Party shall have the right to make copies from such books
and records at its own expense. Any information obtained by SOFTBANK, SOFTBANK
Parent or Ariba through exercise of rights granted under this Section 9 shall,
to the extent constituting Confidential Information under Section 7.3 of the
Stock Purchase Agreement, be subject to the confidentiality provisions set forth
in such Section 7.3.

     10. Softbank Rights. [*].

     11. Company Interests. The Parties agree to implement the Company's capital
structure and the terms of this Agreement so that at all times during the term
hereof, [*].

     12. Annual Business Plan. The Company's management shall discuss its
proposed Annual Business Plan with SOFTBANK before submitting such Annual
Business Plan to the Board for approval.

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     13. Transfer Restrictions.

          (a) Neither SOFTBANK Parent nor SOFTBANK shall, except as otherwise
     specifically provided in this Agreement, sell, transfer, assign,
     hypothecate or in any way alienate ("Transfer") any of its Securities.

          (b) Notwithstanding Section 13(a), SOFTBANK Parent and SOFTBANK may
     Transfer all or any portion of its Securities (i) to any [*] or [*] of such
     Party or (ii) after the closing of [*], to any Person upon the completion
     of such Party's compliance with the restrictions imposed by Section 14 of
     this Agreement; provided that the following conditions shall be satisfied
     in the case of a Transfer pursuant to clause (i) above of this Section
     13(b):

               A. (x) in the case of a Transfer to an [*], such Party covenants
          that such [*] shall remain an [*] of such Party so long as the
          transfer restrictions set forth in this Section 13 are in effect and
          the [*] owns the Transferred shares; and (y) in the case of a Transfer
          to an [*], such [*] covenants that it shall remain an [*] of such
          Party so long as the transfer restrictions set forth in this Section
          13 are in effect and the [*] owns the Transferred shares; and

               B. such Party, or, in the case of a Transfer to an [*] or an [*],
          such [*] or [*] represents and covenants that the shares transferred
          to the transferee are not, and will not be, subject to any lien or
          other security interest, whether direct or indirect, unless such lien
          or security interest is consented to by the Company.

          (c) Intentionally Blank.

          (d) In the case of any Transfer permitted under Section 13(b)(i),
     SOFTBANK Parent or SOFTBANK, as the case may be, shall deliver to the
     Company and Ariba (i) at least ten (10) Business Days prior to such
     Transfer, a written notice stating its intention to Transfer the Securities
     to be Transferred, the name of the transferee, whether such transferee is
     an Affiliate, the number of Securities to be Transferred, and the price and
     other material terms and conditions of the Transfer, (ii) except as
     otherwise specifically provided herein, on or prior to the effective date
     of the Transfer and in a form reasonably acceptable to the Company and its
     counsel, the transferee's written acknowledgement of and agreement to be
     bound by, and to vote the Transferred Securities at all times in accordance
     with, the terms of this Agreement and any other Transaction Agreement, and
     (iii) if reasonably requested by the Company, an opinion of counsel,
     reasonably satisfactory to the Company that such Transfer will not require
     registration of such shares under any applicable securities laws.

          (e) [*] shall not, except as otherwise specifically provided in this
     Agreement, Transfer any of its Securities.

          (f) Notwithstanding Section 13(e), [*] may Transfer all or any portion
     of its Securities (i) to any Person, provided that [*] and its Affiliates
     continue to own at least [*] of the Securities owned by [*] at the close of
     business on the Effective Date and subsequently acquired by [*] pursuant to
     Sections 11 and 18 of this Agreement, or (ii) after the closing of [*], to
     any Person upon the completion of such Party's compliance with the
     restrictions imposed by Section 14 of this Agreement.

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          (g) In the case of any Transfer permitted under Section 13(f)(i), [*]
     shall deliver to [*] (i) at least ten (10) business days prior to such
     Transfer, a written notice stating its intention to Transfer the Securities
     to be Transferred, the name of the transferee, whether such transferee is
     an Affiliate, the number of Securities to be Transferred, and the price and
     other material terms and conditions of the Transfer, (ii) except as
     otherwise specifically provided herein, on or prior to the effective date
     of the Transfer and in a form reasonably acceptable to the Company and its
     counsel, the transferee's written acknowledgement of and agreement to be
     bound by, and to vote the Transferred Securities at all times in accordance
     with, the terms of this Agreement and any other Transaction Agreement and
     (iii) if reasonably requested by the Company, an opinion of counsel,
     reasonably satisfactory to the Company that such Transfer will not require
     registration of such shares under any applicable securities laws.

     14. "Market Stand-Off" Agreement. Each of Ariba, SOFTBANK Parent and
SOFTBANK hereby agrees that it will not, without the prior written consent of
the managing underwriter, during the period commencing on the date of the final
prospectus relating to the Company's IPO and ending on the date specified by the
Company and the managing underwriter(s) (such period not to exceed one hundred
eighty (l80) days) (i) lend, offer, pledge, sell, contract to sell, sell any
option or contract to purchase, purchase any option or contract to sell, grant
any option, right or warrant to purchase, or otherwise Transfer, directly or
indirectly, any Securities, or (ii) enter into any swap or other arrangement
that transfers to another, in whole or in part, any of the economic consequences
of ownership of the Securities, whether any such transaction described in clause
(i) or (ii) above is to be settled by delivery of Securities, in cash or
otherwise. The underwriters in connection with the Company's initial public
offering are intended third party beneficiaries of this Section 14 and shall
have the right, power and authority to enforce the provisions hereof as though
they were a Party hereto.

     Notwithstanding the foregoing provisions of this Section 14, the
obligations of Ariba, SOFTBANK Parent and SOFTBANK under this Section 14 shall
not be more restrictive than the least restrictive "market standoff" obligations
to which any of the Company's executive officers, directors or 10% or greater
shareholders are subject. In order to enforce the foregoing covenant, the
Company may to the extent permitted by applicable law impose stop-transfer
instructions with respect to the Shares owned by the Investor (and the shares or
securities of every other person subject to the foregoing restriction) until the
end of such period.

     15. Exclusivity.

          (a) During the term of this Agreement, [*] agrees that it will not,
     and will not permit any Affiliate in which [*] directly or indirectly holds
     a fifty percent (50%) or greater ownership interest (a "Subject
     Affiliate"), to do any of the following:

               (i) [*].

               (ii) [*];

               (iii) [*]; or

               (iv) [*].

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          (b) [*].

          (c) For purposes of this Section 15, [*] shall not be deemed an
     investment fund or investment vehicle or a Subject Affiliate.

          (d) This Section 15 shall terminate at such time as [*].

     16. Co-Sale Rights.

          (a) If any [*] desires to Transfer any of its Securities (the "Offered
     Co-Sale Securities") to any Person (other than [*]) and such Offered
     Co-Sale Securities, together with any Securities previously Transferred by
     [*] to Persons (other than [*]) represent [*] or more of the outstanding
     Fully Diluted Securities measured at the time of such Transfer, the [*]
     (each, a "Co-Sale Shareholder") shall have the right and option to include
     a pro rata portion of the Securities to be sold in the proposed sale at the
     same price per share and on the same other terms and conditions that apply
     to [*] in the proposed sale. Each Co-Sale Shareholder's pro rata portion
     shall be equal to the product of (i) the outstanding Securities owned by
     such Co-Sale Shareholder divided by the outstanding Securities owned by [*]
     and all Co-Sale Shareholders who duly elect to sell Securities in the
     transaction, multiplied by (ii) the total number of Securities proposed to
     be sold in the transaction. The number of Offered Co-Sale Securities to be
     sold by [*] in the transaction shall be reduced to the extent that Co-Sale
     Shareholders elect to participate in the transaction.

          (b) [*] shall give notice to each Co-Sale Shareholder of the proposed
     sale. Such notice shall contain the proposed sales price per share and the
     other material terms and conditions on which [*] desires to sell the
     Offered Co-Sale Securities. Each Co-Sale Shareholder may exercise its right
     to participate in the sale pursuant to this Section 16 by giving notice to
     [*] and each other Co-Sale Shareholder within fifteen (15) days after
     receipt of such notice from [*].

     17. Additional Capital. If the Company seeks to raise additional capital
primarily for financing rather than strategic purposes, the Company shall [*],
provided that [*]shall be determined by the Board in its sole good faith
discretion.

     18. Right of First Offer.

          (a) Subject to the terms and conditions specified in this Section 18,
     the Company hereby grants to each Investor a right of first offer with
     respect to future sales by the Company of its Securities. Each time the
     Company proposes to offer any Securities, the Company shall first make an
     offering of the Securities to the Investors in accordance with the
     following provisions.

          (b) The Company shall deliver a notice in accordance with Section 26.2
     ("Notice") to each Investor stating (i) its bona fide intention to offer
     the Securities, (ii) the number of Securities to be offered (the "Offered
     Securities"), and (iii) the price and terms upon which it proposes to offer
     the Offered Securities.

                                       10

<PAGE>

          (c) By written notification received by the Company, within twenty
     (20) calendar days after receipt of the Notice, the Investor may elect to
     purchase or obtain, at the price and on the terms specified in the Notice,
     up to that portion of the Offered Securities that equals the proportion
     that the number of shares of Securities issued and held by the Investor,
     after giving effect to the exchange, exercise and conversion of all
     Securities held by Investor that are exchangeable and exercisable for and
     convertible into Securities, bears to the total number of shares of
     Securities then outstanding, after giving effect to the exchange, exercise
     and conversion of all securities then outstanding that are exchangeable and
     exercisable for and convertible into Securities.

          (d) Notwithstanding Section 18(c), [*].

          (e) If all Offered Securities that Investors are entitled to obtain
     pursuant to Sections 18(c) and (d) are not elected to be obtained as
     provided in Sections 18(c) and (d) hereof, the Company may, during the one
     hundred twenty (120) day period following the expiration of the period
     provided in subsection 18(c) hereof, offer the remaining unsubscribed
     portion of such Offered Securities to any person or persons at a price not
     less than, and upon terms no more favorable to the offeree than those
     specified in the Notice. If the Company does not enter into an agreement
     for the sale of the Offered Securities within such period, or if such
     agreement is not consummated within sixty (60) days of the execution
     thereof, the right provided hereunder shall be deemed to be revived and
     such Offered Securities shall not be offered unless first reoffered to the
     Investor in accordance herewith.

          (f) The right of first offer in this Section 18 shall not be
     applicable to (i) the issuance or sale of shares of Common Stock (or
     options therefor) to employees, directors and consultants for the primary
     purpose of soliciting or retaining their services; (ii) the issuance of
     Securities pursuant to a bona fide public offering of shares of Common
     Stock, (iii) the issuance of Securities in connection with a bona fide
     business acquisition of or by the Company, whether by merger,
     consolidation, sale of assets, sale or exchange of stock or otherwise, (iv)
     the issuance of stock, warrants or other Securities or rights not primarily
     for equity financing purposes to persons or entities with which the Company
     has business relationships or will have a strategic business relationship
     following such issuance, (vi) [*]. The right of first offer in Section
     18(c) [*] shall terminate upon the closing of the IPO.

     19. IPO Commitment.

          (a) The Parties intend that, on or prior to the [*] anniversary of the
     Effective Date, the Company will seek to conduct an initial public offering
     of shares of its Common Stock ("IPO"), subject to prevailing market
     conditions and the condition and performance of the Company.

          (b) [*].

          (c) Each shareholder agrees to enter into a customary market standoff
     agreement with the underwriter(s) in the IPO with substantially the same
     terms and conditions as set forth in Section 14.

                                       11

<PAGE>

     20. Certain Breaches. If [*] alleges in writing to the Company, after
consultation with its outside counsel, that it is probable that [*] has breached
any contract between [*], on the one hand, and the Company or any of its
controlled Affiliates, on the other hand, the Board shall at the request of [*]
form a committee of the Board (the "Litigation Committee") consisting of [*].
The Committee shall have the sole and exclusive authority to (i) determine
whether to assert on behalf of the Company that [*] has breached any such
contract and (ii) if any such assertion is made, to control the resolution of
any such dispute, but only if such dispute is resolved through the dispute
resolution process set forth in Section 26.1 hereof as if applicable to disputes
referred to in this Section 20. [*] agrees, upon behalf of itself and [*] and
the Company agrees on behalf of itself and its controlled Affiliates to submit
any such dispute to the dispute resolution process set forth in Section 26.1
hereof. Notwithstanding the foregoing, this Section 20 shall not apply to any
claims for breach of contract that are released and discharged pursuant to
Section 1 of the Release. Prior to March 31, 2004, no action by the Litigation
Committee pursuant to this Section 20 shall constitute an election to terminate
the Distribution Agreement for any purpose.

     21. Modification of Transaction Agreements.

          (a) [*].

          (b) [*].

          (c) [*].

          (d) [*].

     22. Representations and Warranties of SOFTBANK and SOFTBANK Parent. Each of
SOFTBANK and SOFTBANK Parent hereby represents and warrants to Ariba and the
Company that, as of the Effective Date, the following statements are and shall
be true and correct:

          (a) Organization. Each of SOFTBANK and SOFTBANK Parent is a
     corporation duly organized and validly existing under the laws of Japan,
     and has the corporate power and authority to enter into and perform this
     Agreement and the other Transaction Agreements to which it is a party.

          (b) Permits; Approvals. Each of SOFTBANK and SOFTBANK Parent holds all
     licenses, permits, certifications and other authorizations, the absence of
     which would have a material adverse effect on its financial condition or
     business, and there has been no default or violation under any such
     authorization and there is no proceeding or investigation that is pending
     or, to each such Party's knowledge, threatened under which any such
     authorization may be revoked, terminated or suspended.

          (c) Authorization. All corporate action on the part of each of
     SOFTBANK and SOFTBANK Parent necessary for the authorization, execution and
     delivery of this Agreement and the other Transaction Agreements to which it
     is a party and for the performance of all of its obligations hereunder and
     thereunder has been taken, and this Agreement and the other Transaction
     Agreements to which it is a party when fully executed and

                                       12

<PAGE>

     delivered, shall each constitute a valid, legally binding and enforceable
     obligation of each such Party.

          (d) Government and Other Consents. No consent, authorization, license,
     permit, registration or approval of, or exemption or other action by, any
     governmental or public body or authority, or any other Person, is required
     in connection with the execution, delivery and performance by each of
     SOFTBANK and SOFTBANK Parent of this Agreement and the other Transaction
     Agreements to which it is a party, or if any such consent is required, each
     such Party has satisfied the applicable requirements.

          (e) Effect of Agreement. The execution, delivery and performance of
     this Agreement and the other Transaction Agreements to which SOFTBANK or
     SOFTBANK Parent is a party will not (i) violate the Articles of
     Incorporation of such party or any provision of any law, statute, rule or
     regulation to which such party is subject, (ii) violate any judgment,
     order, writ, injunction or decree of any court applicable to such party,
     (iii) have any effect on the compliance of such party with any applicable
     licenses, permits or authorizations which would materially and adversely
     affect such party, (iv) result in the breach of, give rise to a right of
     termination, cancellation or acceleration of any obligation with respect to
     (presently or with the passage of time), or otherwise be in conflict with
     any term of, or affect the validity or enforceability of, any agreement or
     other commitment to which such party is a party and which would materially
     and adversely affect such party or (v) result in the creation of any lien,
     pledge, mortgage, claim, charge or encumbrance upon any assets of such
     party.

          (f) Litigation. There are no actions, suits or proceedings pending or,
     to such party's knowledge, threatened, against such party before any court
     or governmental agency which question such party's right to enter into or
     perform its obligations under this Agreement or the other Transaction
     Agreements to which it is a party, or which question the validity of this
     Agreement or any of the other Transaction Agreements.

          (g) Disclosure. No representation or warranty by SOFTBANK or SOFTBANK
     Parent contained in this Agreement or in any other Transaction Agreements
     to which such party is a party, and no exhibit, writing or other instrument
     required to be furnished by such party pursuant hereto or thereto contains
     any untrue statement of a material fact or omits any material fact
     necessary in order to make the statements and information contained herein
     or therein not misleading.

     23. Representations and Warranties of Ariba. Ariba hereby represents and
warrants to SOFTBANK Parent and SOFTBANK that, as of the Effective Date, the
following statements are true and correct:

          (a) Organization. Ariba is a corporation duly organized and validly
     existing under the laws of Delaware. Ariba has the corporate power and
     authority to enter into and perform this Agreement and the other
     Transaction Agreements to which it is a party.

          (b) Permits; Approvals. Ariba holds all licenses, permits,
     certifications and other authorizations, including without limitation any
     such authorizations

                                       13

<PAGE>

     required under U.S. federal securities laws, the absence of which would
     have a material adverse effect on the financial condition or business of
     Ariba, and there has been no default or violation under any such
     authorization and there is no proceeding or investigation that is pending
     or, to Ariba's knowledge, threatened under which any such authorization may
     be revoked, terminated or suspended.

          (c) Authorization. All corporate action on the part of Ariba necessary
     for the authorization, execution and delivery of this Agreement and the
     other Transaction Agreements to which it is a party and for the performance
     of all of its obligations hereunder and thereunder has been taken, and this
     Agreement, the Distribution Agreement and the other Transaction Agreements
     to which it is a party, when fully executed and delivered, shall each
     constitute a valid, legally binding and enforceable obligation of Ariba.

          (d) Government and Other Consents. Except as disclosed in the
     Transaction Agreements, no consent, authorization, license, permit,
     registration or approval of, or exemption or other action by, any
     governmental or public body or authority, or any other Person, is required
     in connection with Ariba's execution, delivery and performance of this
     Agreement or the other Transaction Agreements to which it is a party, or if
     any such consent is required, Ariba has satisfied any applicable
     requirements.

          (e) Effect of Agreement. Ariba's execution, delivery and performance
     of this Agreement and the other Transaction Agreements to which it is a
     party will not (i) violate the Certificate of Incorporation of Ariba or any
     provision of any law, statue, rule or regulation to which it is subject,
     (ii) violate any judgment, order, writ, injunction or decree of any court
     applicable to Ariba, (iii) have any effect on the compliance of Ariba with
     any applicable licenses, permits or authorizations which would materially
     and adversely affect Ariba, (iv) result in the breach of, give rise to a
     right of termination, cancellation or acceleration of any obligation with
     respect to (presently or with the passage of time), or otherwise be in
     conflict with, any term of, or affect the validity or enforceability of any
     agreement or other commitment to which Ariba is a party and which would
     materially and adversely affect Ariba, or (v) result in the creation of any
     lien, pledge, mortgage, claim, charge or encumbrance upon any assets of
     Ariba.

          (f) Litigation. There are no actions, suits or proceedings pending or,
     to Ariba's knowledge, threatened, against Ariba before any court or
     governmental agency which question Ariba's right to enter into or perform
     this Agreement or other Transaction Agreements to which it is a party, or
     which question the validity of this Agreement or any of the other
     Transaction Agreements.

          (g) Disclosure. No representation or warranty by Ariba contained in
     this Agreement or any other Transaction Agreement to which it is a party,
     and no exhibit, writing or other instrument required to be furnished
     pursuant hereto contains any untrue statement of a material fact or omits
     any material fact necessary in order to make the statements and information
     contained herein or therein not misleading.

                                       14

<PAGE>

     24. Effectiveness, Term and Termination.

     24.1 Term. This Agreement shall be effective as of the Effective Date and
shall continue in effect until and unless terminated pursuant to Section 24.2.

     24.2 Termination. This Agreement may be terminated as follows:

          (a) Upon the Parties' mutual written agreement.

          (b) By either Ariba or the Company, effective immediately upon written
     notice to the other Parties, if either SOFTBANK Parent or SOFTBANK breaches
     any material provision of this Agreement or of any of the other Transaction
     Agreements in any material respect and such breach continues for a period
     of thirty (30) days after the delivery of written notice of the default,
     describing the default in reasonable detail.

          (c) By either SOFTBANK Parent or SOFTBANK, effective immediately upon
     written notice to the other Parties, if Ariba or the Company breaches any
     material provision of this Agreement or of any of the other Transaction
     Agreements in any material respect and such breach continues for a period
     of thirty (30) days after the delivery of written notice of the default,
     describing the default in reasonable detail.

          (d) By Ariba, effective immediately upon written notice to the other
     Parties in the event that either Ariba or the Company (except, in the case
     of the Company, while a Control Shift is in effect) has elected to
     terminate [*] in accordance with its terms.

          (e) By either SOFTBANK Parent, SOFTBANK, Ariba or the Company,
     effective immediately upon written notice to the other Parties, in the
     event that any other Party is dissolved, liquidated or declared bankrupt or
     a filing for voluntary or involuntary.

          (f) Notwithstanding the foregoing, the right of SOFTBANK and SOFTBANK
     Parent to terminate this Agreement (i) pursuant to Section 24.2(c), as a
     result of a breach by the Company, or (ii) pursuant to Section 24.2(d), as
     a result of a termination of [*], shall exist only if [*] and only if no
     [*] is in effect.

          (g) For purposes of this Section 24.2, the term "Transaction
     Agreements" has the same meaning given to such term in Section 8.2(f) of
     the Stock Purchase Agreement.

     24.3 Continuing Liability. Notwithstanding the foregoing, Article 25 and
Article 26 (except for Section 26.6, which shall not survive termination) shall
survive a termination of the Agreement. Termination of this Agreement for any
reason shall not release any Party from any liability or obligation which has
already accrued as of the effective date of such termination, and shall not
constitute a waiver or release of, or otherwise be deemed to prejudice or
adversely affect, any rights, remedies or claims, whether for damages or
otherwise, which a Party may have hereunder, at law, equity or otherwise or
which may arise out of or in connection with such termination.

                                       15

<PAGE>

     25. Incidental and Consequential Damages.

NO PARTY NOR ITS AFFILIATES WILL BE LIABLE TO THE OTHER PARTIES UNDER ANY
CONTRACT, NEGLIGENCE, STRICT LIABILITY OR OTHER THEORY FOR ANY INDIRECT,
INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS)
WITH RESPECT TO ANY SUBJECT MATTER OF THIS AGREEMENT.

EACH PARTY AGREES AND ACKNOWLEDGES THAT MONEY DAMAGES MAY NOT BE AN ADEQUATE
REMEDY FOR ANY BREACH OF THE PROVISIONS OF THIS AGREEMENT AND THAT EACH PARTY
MAY, IN ITS SOLE DISCRETION, APPLY FOR SPECIFIC PERFORMANCE AND INJUNCTIVE
RELIEF IN ORDER TO ENFORCE OR PREVENT ANY VIOLATIONS OF THE PROVISIONS OF THIS
AGREEMENT.

     26. Miscellaneous.

     26.1 Governing Law; Dispute Resolution. The validity, construction and
enforceability of this Agreement and all related agreements, collectively or
separately, shall be governed by and construed in accordance with the laws of
the State of California. The Parties shall attempt to resolve all disputes
between the Parties arising out of or relating to this Agreement amicably
through good faith discussions upon the written request of any Party. In the
event that any such dispute cannot be resolved thereby within a period of sixty
(60) days after such notice has been given (the last day of such sixty (60) day
period being herein referred to as the "Arbitration Date"), such dispute shall
be finally settled by arbitration in San Francisco, California, using the
English language in accordance with the Arbitration Rules and Procedures of JAMS
then in effect, by one or more commercial arbitrator(s) with substantial
experience in resolving complex commercial contract disputes, who may or may not
be selected from the appropriate list of JAMS arbitrators. If the Parties cannot
agree upon the number and identity of the arbitrators within fifteen (15) days
following the Arbitration Date, then a single arbitrator shall be selected on an
expedited basis in accordance with the Arbitration Rules and Procedures of JAMS.
Any arbitrator so selected shall have substantial experience in the software
industry. The arbitrator(s) shall have the authority to grant specific
performance and to allocate between the Parties the costs of arbitration
(including service fees, arbitrator fees and all other fees related to the
arbitration) in such equitable manner as the arbitrator(s) may determine. The
prevailing Party in the arbitration shall be entitled to receive reimbursement
of its reasonable expenses (including reasonable attorneys' fees, expert witness
fees and all other expenses) incurred in connection therewith. Judgment upon the
award so rendered may be entered in a court having jurisdiction or application
may be made to such court for judicial acceptance of any award and an order of
enforcement, as the case may be. Notwithstanding the foregoing, each Party shall
have the right to institute an action in a court of proper jurisdiction for
preliminary injunctive relief pending a final decision by the arbitrator(s),
provided that a permanent injunction and damages shall only be awarded by the
arbitrator(s). For all purposes of this Section 26.1, the Parties consent to
exclusive jurisdiction and venue in the United States federal Courts located in
the Northern District of California. For the avoidance of doubt, the validity,
construction, and enforceability of this Agreement and the resolution of
disputes arising out of and relating to this Agreement and any related
agreements (other than an action solely between Nihon Ariba K.K. and Softbank
Commerce Corporation relating solely to the Amended Master Alliance

                                       16

<PAGE>

Agreement), collectively or separately, shall be governed solely by this Section
26.1, notwithstanding that (i) the Amended Master Alliance Agreement is governed
by Japanese law and uses a different dispute resolution procedure or (ii)
disputes arising out of or relating to this Agreement are, or are asserted to,
in any way relate to or be based on similar facts as disputes arising out of or
relating to the Amended Master Alliance Agreement.

     26.2 Notices and Other Communications. Unless otherwise provided, any
notice required or permitted under this Agreement shall be given in writing and
in English and shall be deemed effectively given (i) upon personal delivery to
the party to be notified, (ii) by delivery by confirmed facsimile or (iii) three
(3) Business Days after being provided to an internationally recognized courier
service with an expected delivery of no more than three (3) business days, in
each case to the party to be notified at the address indicated for such party on
the signature page hereof, or at such other address as such party may designate
by ten (10) days' advance written notice to the other Parties:

          (a) If to SOFTBANK Parent

               [*]

               with a copy to:

               [*]

          (b) If to SOFTBANK

               [*]

               with a copy to:

               [*]

          (c) If to the Company

               [*]

               with a copy to:

               [*]

          (d) If to Ariba

               [*]

               with a copy to:

               [*]

     26.3 Language. This Agreement is in the English language only, which
language shall be controlling in all respects, and all versions hereof in any
other language shall

                                       17

<PAGE>

be for accommodation only and shall not be binding upon the Parties. All
communications and notices to be made or given pursuant to this Agreement shall
be in the English language.

     26.4 Severability. If any provision in this Agreement shall be found or be
held to be invalid or unenforceable (including, without limitation, as a result
of objections by the Japanese Fair Trade Commission) then the meaning of said
provision shall be construed, to the extent feasible, so as to render the
provision enforceable, and if no feasible interpretation would save such
provision, it shall be severed from the remainder of this Agreement which shall
remain in full force and effect unless the severed provision is essential and
material to the rights or benefits received by any Party. In such event, the
Parties shall use commercially reasonable efforts to negotiate, in good faith, a
substitute, valid and enforceable provision or agreement which most nearly
affects the Parties' intent in entering into this Agreement.

     26.5 References; Subject Headings. Unless otherwise indicated, references
to Sections and Exhibits herein are to Sections of, and Exhibits to, this
Agreement. The subject headings of the Sections of this Agreement are included
for the purpose of convenience of reference only, and shall not affect the
construction or interpretation of any of its provisions.

     26.6 Further Assurances. The Parties shall each perform such acts, execute
and deliver such instruments and documents, and do all such other things as may
be reasonably necessary to accomplish the transactions contemplated in this
Agreement.

     26.7 Expenses. Each of the Parties will bear its own costs and expenses,
including, without limitation, fees and expenses of legal counsel, accountants,
brokers, consultants and other representatives used or hired in connection with
the negotiation and preparation of this Agreement and consummation of the
transactions contemplated hereby.

     26.8 No Waiver. No waiver of any term or condition of this Agreement shall
be valid or binding on a Party unless the same shall have been set forth in a
written document, specifically referring to this Agreement and duly signed by
the waiving Party. The failure of a Party to enforce at any time any of the
provisions of this Agreement, or the failure to require at any time performance
by the other Party of any of the provisions of this Agreement, shall in no way
be construed to be a present or future waiver of such provisions, nor in any way
affect the ability of a Party to enforce each and every such provision
thereafter.

     26.9 Entire Agreement; Amendments. The terms and conditions contained in
this Agreement (including the Exhibits hereto) and the other Transaction
Agreements constitute the entire agreement between the Parties and supersede all
previous agreements and understandings, except for the Ariba Non-Disclosure
Agreement, whether oral or written, between the Parties with respect to the
subject matter hereof. No agreement or understanding amending this Agreement
shall be binding upon any Party unless set forth in a written document in
English which expressly refers to this Agreement and which is signed and
delivered by duly authorized representatives of each Party.

     26.10 Assignment. No Party shall assign this Agreement (or any right or
obligation hereunder) without the other Parties' prior written consent, except
that (i) [*] may

                                       18

<PAGE>

assign this Agreement to a Person into which it has merged or which has
otherwise succeeded to all or substantially all of [*] business or assets and
(ii) [*] may assign this Agreement to a Person that is a wholly owned subsidiary
of [*], respectively, or a Person who has succeeded to all or substantially all
of the business or assets of [*], respectively. All assignees under this Section
26.10 must assume in writing or by operation of law, the assigning Party's
obligations under this Agreement, provided, however, that the assigning Party
shall remain liable for the assignee's performance of its obligations hereunder.
This Agreement shall inure to the benefit of, and shall be binding upon, the
Parties and their respective permitted successors and assigns.

     26.11 No Agency. The Parties are independent contractors. Nothing contained
herein or done in pursuance of this Agreement shall constitute any Party the
agent of any other Party for any purpose or in any sense whatsoever.

     26.12 No Beneficiaries. Nothing herein express or implied, is intended to
or shall be construed to confer upon or give to any person, firm, corporation or
legal entity, other than the Parties, any interests, rights, remedies or other
benefits with respect to or in connection with any agreement or provision
contained herein or contemplated hereby.

     26.13 Counterparts. This Agreement may be executed in any number of
counterparts, and each counterpart shall constitute an original instrument, but
all such separate counterparts shall constitute only one and the same
instrument.

                                       19

<PAGE>

     IN WITNESS WHEREOF, the Parties have caused their respective duly
authorized representatives to execute this Agreement as of the date hereof.

                                       SOFTBANK CORP.

                                       By: /s/ Masayoshi Son
                                          --------------------------------------

                                       Title: President and CEO
                                             -----------------------------------

                                       SOFTBANK EC HOLDINGS CORP.

                                       By:  /s/ Ken Miyauchi
                                          --------------------------------------

                                       Title:   President and CEO
                                             -----------------------------------

                                       ARIBA, INC.

                                       By:  /s/ Robert M. Calderoni
                                          --------------------------------------

                                       Title:  President and CEO
                                             -----------------------------------

                                       NIHON ARIBA K.K.

                                       By:   /s/ Kuniaki Watanabe
                                          --------------------------------------

                                       Title:  President and CEO
                                             -----------------------------------

<PAGE>

                                  Exhibit 1.27

                                       [*]

<PAGE>

                                  Exhibit 4(d)

                                       [*]

[*]

<PAGE>

                                  Exhibit 21(b)

                                       [*]

(3)  [*]

<PAGE>

                                   Schedule 15

                                       [*]

                                       [*]<PAGE>

                                                                   EXHIBIT 10.22

*    Represents confidential information for which Ariba, Inc. is seeking
     confidential treatment with the Securities and Exchange Commission.

                                October 20, 2001

Dear Larry:

     This letter (the "Agreement") is to confirm the agreement between you and
Ariba, Inc. ("Ariba" or the "Company") regarding the termination of your
employment with the Company.

     1.   Your employment with the Company terminated on July 18, 2001
          ("Termination Date"). Although you are not otherwise entitled to
          receive any severance pay from the Company, the Company will provide
          you with the following severance benefits: (a) a lump sum cash
          severance payment of $2,005,575.00; (b) if you elect to continue your
          health insurance coverage under COBRA, the Company will directly pay
          the COBRA premiums to the insurance carrier to continue the medical
          benefits for you and your eligible dependents through and until the
          earlier of February 1, 2003 or the date that you are eligible to
          receive medical insurance benefits from another employer; and (c)
          2,000,000 shares of Ariba's common stock as set forth in paragraph 5
          below. You will receive the cash severance payment and the shares
          eight days after you sign this Agreement ("Effective Date") or, if
          later, when you have made arrangements satisfactory to the Company for
          satisfying all applicable withholding tax obligations. The Company
          anticipates that the entire cash severance payment will be applied to
          pay withholding taxes required with respect to the cash severance
          payment and the shares. The Company also anticipates that you will be
          required to make a cash payment to the Company to satisfy additional
          withholding tax obligations with respect to the shares.

     2.   You agree that the only payments and benefits that you are entitled to
          receive from the Company in the future are those specified in this
          Agreement.

     3.   The Company will reimburse you $47,079.55 for all past business
          expenses incurred by you on behalf of the Company. In addition, the
          Company agrees that in accordance with any written agreement between
          you and the Company it shall reimburse you for any reasonable tax
          preparation expenses incurred by you for 1999 and 2000, provided you
          submit all necessary documents regarding such expenses directly to [*]
          within thirty (30) days of the date of this Agreement for his sole
          review and approval.

<PAGE>

     4.   Effective one (1) day immediately following the Effective Date you
          hereby resign as a member of the Company's Board of Directors and as a
          member of the Board of Directors of Ariba Nihon K.K., Ariba Korea
          Limited and all other boards with which you served as a member as a
          result of your prior affiliation with the Company.

     5.   Upon the Effective Date or, if later, when you have made arrangements
          satisfactory to the Company for satisfying all applicable withholding
          tax obligations, you will receive 2,000,000 shares of Ariba's common
          stock (the "Shares") under Ariba's 1999 Equity Incentive Plan. The
          Shares are fully vested. The Shares are registered with the Securities
          and Exchange Commission on Form S-8 and are eligible for resale at any
          time (subject to the rules that apply to all sales by members of the
          Board of Directors, former executive officers and persons who possess
          material non-public information about Ariba). You acknowledge that the
          restricted stock awarded to you on April 20, 2001 expired unvested.
          You agree that you were granted the following options and that all of
          such options are hereby cancelled:

          ------------------- --------------------------- ---------------------
          Grant Date              Number of Shares            Exercise Price
          ------------------- --------------------------- ---------------------
           9/20/99                        11,888                   $33.625
          ------------------- --------------------------- ---------------------
           9/20/99                     1,988,112                    33.625
          ------------------- --------------------------- ---------------------
           4/17/00                         1,840                    54.4375
          ------------------- --------------------------- ---------------------
           4/17/00                       398,160                    54.4375
          ------------------- --------------------------- ---------------------
           7/11/00                     1,000,000                    91.125
          ------------------- --------------------------- ---------------------
            4/4/01                     1,675,000                     4.8125
          ------------------- --------------------------- ---------------------
            4/4/01                        19,048                     4.8125
          ------------------- --------------------------- ---------------------
            4/4/01                     3,305,952                     4.8125
          ------------------- --------------------------- ---------------------

     6.   In consideration for receiving the severance payment and benefits
          described in paragraph 1 above, including the shares of Ariba's common
          stock described in paragraph 5 above, and the release of claims
          provided in paragraph 8 below, you waive and release and promise never
          to assert any claims or causes of action, whether or not now known,
          against the Company or its predecessors, successors, or past or
          present subsidiaries (whether or not wholly owned), officers,
          directors, agents, employees and assigns (together called "the
          Releasees"), with respect to any matter (without limitation) arising
          out of or connected in any way with your employment with the Company
          or the termination of that employment, including without limitation,
          claims of wrongful discharge, constructive discharge, emotional
          distress, defamation, invasion of privacy, fraud, breach of contract,
          breach of the covenant of good faith and fair dealing, any claims of
          discrimination or harassment based on sex, age, race, national origin,
          disability or on any other basis, under Title VII of the Civil Rights
          Act of 1964, as amended, the California Fair Employment and Housing
          Act, the Age Discrimination in Employment Act of 1967, the

                                       2

<PAGE>

          Americans with Disabilities Act, and all other laws and regulations
          relating to employment.

     7.   You understand and agree that there exists a good faith dispute
          between you and Ariba regarding alleged non-payment of wages. You
          further understand and agree that in settlement of this good faith
          dispute, Ariba will provide a payment to you equal to $116,300.67,
          less all applicable withholdings. In consideration of this payment to
          be paid to you by Ariba, you hereby fully and forever release and
          discharge Ariba from all claims and causes of action arising out of or
          relating in any way to any dispute regarding your compensation at
          Ariba, including, but not limited to, salary, bonuses or vacation
          time.

     8.   In consideration for the release of claims provided in paragraph 6
          above, the Company waives and releases and promises never to assert
          any claims or causes of action, whether or not now known, against you
          with respect to any matter related to your employment with the Company
          or the termination of that employment, including without limitation,
          defamation, fraud, breach of contract, or breach of the covenant of
          good faith and fair dealing.

     9.   Any controversy involving the construction or application of any
          terms, covenants or conditions of this Agreement, or any claims
          arising out of any alleged breach of this Agreement, will be governed
          by the rules of the American Arbitration Association and submitted to
          and settled by final and binding arbitration in Santa Clara County,
          California, except that any alleged breach of the Company's
          Proprietary Information and Inventions Agreement or paragraphs 15 or
          16 herein shall not be submitted to arbitration and instead the
          Company may seek all legal and equitable remedies, including without
          limitation, injunctive relief.

     10.  You and the Company expressly waive and release any and all rights and
          benefits under Section 1542 of the Civil Code of the State of
          California (or any analogous law of any other state), which reads as
          follows: "A general release does not extend to claims which the
          creditor does not know or suspect to exist in his favor at the time of
          executing the release, which, if known by him, must have materially
          affected his settlement with the debtor."

     11.  Your participation in the Company's Employee Stock Purchase Plan ended
          as of your Termination Date. Any payroll deductions accumulated but
          not used to purchase shares as of your last day worked have been
          refunded to you. You acknowledge that you have no other stock rights
          in the Company, or any parent or subsidiary (whether or not wholly
          owned), including options or other rights to acquire shares of the
          Company's common stock or other equity securities of the Company or
          any such

                                       3

<PAGE>

          parent or subsidiary, other than those rights enumerated in this
          paragraph and in paragraph 5.

     12.  Nothing contained in this Agreement shall constitute or be treated as
          an admission by you or the Company of liability, of any wrongdoing, or
          of any violation of law.

     13.  You represent and warrant that since your Termination Date you: (a)
          have returned to the Company all Company property, including, but not
          limited to, your Company-issued laptop computer, including all files
          stored on such computer, any papers, files, documents, equipment,
          keys, access cards, identification, software or disks (provided,
          however, that you may retain in your possession the desktop computer,
          printer and facsimile machine previously provided to you by the
          Company); (b) have not made and/or retained copies of any Company
          property, including, but not limited to the foregoing; and (c) have
          not disclosed to any third-party any Company confidential or
          proprietary information.

     14.  At all times in the future, you will remain bound by the Company's
          Proprietary Information and Invention Agreement ("PIIA") signed by
          you, a copy of which is attached as Exhibit A hereto.

     15.  During the period commencing on the Termination Date and continuing
          for a period of six (6) months thereafter, you agree not to, directly
          or indirectly on behalf of yourself or any other party, solicit,
          induce or encourage any employee or consultant to terminate any
          employment or business relationship with the Company for any reason.

     16.  You understand and agree that as a result of your position as the
          Company's chief executive officer you had unique access to the
          Company's confidential and proprietary information. You further
          understand and agree that in order to protect the Company's
          confidential and proprietary information, it is necessary that you
          enter into this agreement not to compete.

          a.   You agree that during the period commencing on the Termination
               Date and continuing until the first anniversary of the
               Termination Date you shall not: (i) directly or indirectly,
               individually or in conjunction with others, engage in activities
               that compete with the Company or work for any entity that is part
               of the Company's Market; (ii) solicit, serve, contract with or
               otherwise engage any existing or prospective customer, client or
               account of the Company on behalf of any entity that is part of
               the Company's Market; or (iii) cause or attempt to cause any
               existing or prospective customer, client or account of the
               Company to divert from, terminate, limit or in any manner modify,
               or fail to enter into, any actual or potential business
               relationship with the Company. You and the Company agree that
               this provision is reasonably enforced

                                       4

<PAGE>

               with reference to any geographic area in which the Company
               maintains any such relationship and further that the Company's
               Market is global in scope.

          b.   For purposes of this paragraph 16, the Company's "Market" shall
               mean (i) all companies that derive their revenue primarily from
               e-procurement software sales or sales of software or services
               aiding companies in sourcing activities; and (ii) those companies
               set forth on Exhibit B hereto.

          c.   You understand and agree that: (i) the remedy at law for any
               breach of paragraph 16 of this Agreement is and will be
               inadequate, and in the event of a breach or threatened breach by
               you of the provisions of paragraph 16 of this Agreement, the
               Company shall be entitled to seek an injunction restraining you
               from the conduct which would constitute a breach of this
               Agreement. Nothing herein shall be construed as prohibiting the
               (iii) Company from pursuing any other remedies available to it
               for such breach or threatened breach including, without
               limitation, the recovery of damages from you; and (ii) in the
               event of a breach by you of the provisions of paragraph 16 of
               this Agreement, in addition to any other remedies that would be
               otherwise available to the Company, the Company will be entitled
               to and you would be obligated to immediately provide to the
               Company (A) the proceeds from your sale of the Shares or (B) in
               the event that you had not sold the Shares at the time of such
               breach, the Shares.

          d.   You and the Company expressly agree that the character, duration
               and geographical scope of this paragraph 16 are reasonable.
               However, should a determination nonetheless be made by a court of
               competent jurisdiction that the character, duration or
               geographical scope of this paragraph 16 is unenforceable pursuant
               to applicable law, then it is your intention and you agree that
               this paragraph 16 shall be modified by the court to the minimum
               extent necessary to render the provisions of this paragraph 16
               enforceable pursuant to applicable law.

17.  You agree that at all times in the future, you will not make any derogatory
     remarks regarding the Company, any of its subsidiaries (whether or not
     wholly owned) or any of its or their current or former officers, directors,
     products or business practices. You also agree to take any action
     reasonably requested by [*] or his successor in connection with the
     termination of your employment with the Company and its subsidiaries
     (whether or not wholly owned), including signing any formal resignations
     and reviewing and executing written consents of boards of directors
     regarding any matters that occurred on or before your Termination Date.

                                       5

<PAGE>

18.  You agree that you will not initiate, maintain or accept the benefits from
     any legal action or proceeding of any kind against any of the Releasees as
     to any matter released in this Agreement.

     You shall make all reasonable and diligent efforts to cooperate with Ariba
     and its counsel regarding any litigation or investigation by any state,
     federal, foreign or private person or entity, directly or indirectly
     arising from or relating to any transaction, event or activity that
     occurred during your employment with Ariba, asserted against any of the
     Releasees. Such cooperation shall include all reasonable assistance that
     Ariba determines is necessary, including, but not limited to, meeting or
     consulting with Ariba and its counsel and their designees, reviewing
     documents, analyzing facts and appearing or testifying as a witness or
     interviewee or otherwise. You further agree that commencing on the
     Effective Date and continuing through and until April 20, 2002, you will
     make yourself available to Ariba and its counsel for up to [*] per month.
     You and Ariba agree that if at any time between April 21, 2002 and October
     20, 2002 Ariba or its legal counsel request your assistance for more than
     [*] in any month, Ariba shall reimburse you at the rate of [*] per hour
     for any assistance you directly provide to Ariba or its counsel in excess
     of [*] in any month during that period.

     In connection with such cooperation, except as otherwise required by law,
     judicial order, or other lawful process, you will not cooperate or
     communicate in any way with any other party or witness or their counsel or
     designees, including, but not limited to, [*], without the express prior
     written consent of Ariba; provided, however, that you may communicate with
     [*] regarding any matters not related to Releasees (this prohibition
     includes, but is not limited to, any matters related to the employment or
     termination of employment of [*], you or any other employee from Ariba).
     Requests for such written consent shall be directed to [*] or his
     successor. You further agree that you will advise [*], or his successor, as
     soon as practicable but in any event within five (5) business days if you
     are contacted by any person, firm, corporation, association or other entity
     in connection with any pending or threatened claim against any of the
     Releasees. Upon receiving such a request, Ariba will respond as soon as
     practicable but in any event within five (5) business days by either
     granting or denying such consent or by stating that it is not in a position
     to take such action due to the temporary unavailability of certain
     individuals at Ariba.

     Nothing in this paragraph 18 is intended to prevent you from complying with
     the compulsory process of any court or agency or from providing truthful
     and accurate testimony in any proceeding in which you do testify.

19.  All compensation paid under this Agreement is subject to reduction to
     reflect applicable withholding and payroll taxes.

                                       6

<PAGE>

20.  You agree that you will not disclose to others the fact or terms of this
     Agreement, except that you may disclose such information to your attorney,
     accountant, stock broker or tax advisor in order for such individuals to
     render services to you; provided that you inform any such individual that
     he or she may not disclose such information to any other party.

21.  You agree that except as expressly provided in this Agreement and the PIIA,
     this Agreement renders null and void any and all prior agreements between
     you and the Company. You and the Company agree that this Agreement and the
     PIIA constitute the entire agreement between you and the Company regarding
     the subject matter therein, and that this Agreement may be modified only in
     a written document signed by you and a duly authorized officer of the
     Company.

22.  This Agreement shall be construed and interpreted in accordance with the
     laws of the State of Colorado, without regard to principles of conflicts or
     choice of laws.

23.  You agree that this Agreement may be executed in counterparts, each of
     which shall be an original, but all of which together shall constitute one
     agreement. Execution of a facsimile copy shall have the same force and
     effect as execution of an original, and a facsimile signature shall be
     deemed an original and valid signature.

24.  You have up to twenty-one (21) days after receipt of this Agreement within
     which to review it and to discuss with an attorney of your own choosing, at
     your own expense, whether or not you wish to sign it. Furthermore, you have
     seven (7) days after you have signed this Agreement during which time you
     may revoke this Agreement.

25.  If you wish to revoke this Agreement, you may do so by delivering a letter
     of revocation to me. Because of this revocation period, you understand that
     this Agreement shall not become effective or enforceable until the eighth
     day after the date you sign this Agreement.

Please indicate your agreement with the above terms by signing below.

                                       7

<PAGE>

                                       Sincerely,

                                       /s/ Nancy Kato
                                       -----------------------------------------
                                       Nancy Kato

                                       Senior Vice President, Human Resources

     My agreement with the above terms is signified by my signature below.
Furthermore, I acknowledge that I have read and understand this Agreement and
that I sign this release of all claims voluntarily, with full appreciation that
at no time in the future may I pursue any of the rights I have waived in this
Agreement.

Signed: /s/ Larry Mueller              Dated: October 20, 2001
        ----------------------------          ----------------------------------
            Larry Mueller

                                       8

<PAGE>

                                    Exhibit A
                                    ---------

                                       9

<PAGE>

                                   Ariba, Inc.

                PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT

     The following Proprietary Information and Inventions Agreement
("Agreement") confirms an understanding between me (Lawrence A. Mueller), and
Ariba, Inc., a Delaware corporation (the "Company"), which is a material part of
the consideration for my employment by the Company:

1. The Company shall own all right, title and interest (including patent rights,
copyrights, trade secret rights, mask work rights and other rights throughout
the world) in any inventions, works of authorship, mask works, ideas or
information made or conceived or reduced to practice, in whole or in part, by me
during the term of my employment with the Company to and only to the fullest
extent allowed by California Labor Code Section 2870 (which is attached as
Appendix A) (collectively "Inventions") and I will promptly disclose all
Inventions to the Company. I will also disclose anything I believe is excluded
by Section 2870 so that the Company can make an independent assessment. I hereby
make all assignments necessary to accomplish the foregoing. I shall further
assist the Company, at the Company's expense, to further evidence, record and
perfect such assignments, and to perfect, obtain, maintain, enforce, and defend
any rights specified to be so owned or assigned. I hereby irrevocably designate
and appoint the Company and its agents and attorneys-in-fact to act for and in
my behalf to execute and file any document and to do all other lawfully
permitted acts to further the purposes of the foregoing with the same legal
force and effect as if executed by me. If I wish to clarify that something
created by me prior to my employment that relates to the Company's actual or
proposed business is not within the scope of this Agreement, I have listed it on
Appendix B.

2. To the extent allowed by law, paragraph 1 includes all rights of paternity,
integrity, disclosure and withdrawal and any other rights that may be known as
or referred to as "moral rights" (collectively, "Moral Rights"). To the extent I
retain any such Moral Rights under applicable law, I hereby waive such Moral
Rights and consent to any action consistent with the terms of this Agreement
with respect to such Moral Rights. I will confirm any such waivers and consents
from time to time as requested by the Company.

3. I agree that all Inventions and all other business, technical and financial
information I develop, learn or obtain during the term of my employment that
relates to the Company or the business or demonstrably anticipated business of
the Company or that are received by or for the Company in confidence, constitute
"Proprietary Information." I will hold in confidence and not disclose or, except
within the scope of my employment, use any Proprietary Information. However, I
shall not be obligated under this paragraph with respect to information I can
document is or becomes readily publicly available without restriction through no
fault of mine. Upon termination of my employment, I will promptly return to the
Company all items containing or embodying Proprietary Information (including all
copies), except that I may keep my personal copies of (i) my compensation

<PAGE>

records, (ii) materials distributed to stockholders generally and (iii) this
Agreement.

4. During the period of my employment with the Company and for one year
thereafter, I will not encourage or solicit any employee or consultant of the
Company to leave it for any reason (except for the bona fide firing of the
Company personnel within the scope of my employment).

5. I agree that during the term of my employment with the Company (whether or
not during business hours), I will not engage in any activity that is in any way
competitive with the business or demonstrably anticipated business of the
Company, and I will not assist any other person or organization in competing or
in preparing to compete with any business or demonstrably anticipated business
of the Company.

6. I have not entered into, and I agree I will not enter into, any agreement
either written or oral in conflict with this Agreement or my employment with the
Company. I will not violate any agreement with or rights of any third party or,
except as expressly authorized by the Company in writing, use or disclose my own
or any third party's confidential information or intellectual property when
acting within the scope of my employment or otherwise on behalf of the Company.

7. I agree that this Agreement is not an employment contract for any particular
term and that I have the right to resign and the Company has the right to
terminate my employment at will, at any time, for any or no reason, with or
without cause. In addition, this Agreement does not purport to set forth all of
the terms and conditions of my employment, and, as an employee of the Company, I
have obligations to the Company which are not set forth in this Agreement.
However, the terms of this Agreement govern over any inconsistent terms and can
only be changed by a subsequent written agreement signed by the President of the
Company.

8. I agree that my obligations under paragraphs 1, 2, 3 and 4 of this Agreement
shall continue in effect after termination of my employment, regardless of the
reason or reasons for termination, and whether such termination is voluntary or
involuntary on my part, and that the Company is entitled to communicate my
obligations under this Agreement to any future employer or potential employer of
mine. My obligations under paragraphs 1, 2 and 3 also shall be binding upon my
heirs, executors, assigns, and administrators and shall inure to the benefit of
the Company, its subsidiaries, successors and assigns.

9. Any dispute in the meaning, effect or validity of this Agreement shall be
resolved in accordance with the laws of the State of California without regard
to the conflict of laws provisions thereof. I further agree that if one or more
provisions of this Agreement are held to be illegal or unenforceable under
applicable California law, such illegal or unenforceable portion(s) shall be
limited or excluded from this Agreement to the minimum extent required so that
this Agreement shall otherwise remain in full force and effect and enforceable
in accordance with its terms.

                                     Page 2

<PAGE>

I HAVE READ THIS AGREEMENT CAREFULLY AND I UNDERSTAND AND ACCEPT THE OBLIGATIONS
WHICH IT IMPOSES UPON ME WITHOUT RESERVATION. NO PROMISES OR REPRESENTATIONS
HAVE BEEN MADE TO ME TO INDUCE ME TO SIGN THIS AGREEMENT. I SIGN THIS AGREEMENT
VOLUNTARILY AND FREELY, IN DUPLICATE, WITH THE UNDERSTANDING THAT ONE
COUNTERPART WILL BE RETAINED BY THE COMPANY AND THE OTHER COUNTERPART WILL BE
RETAINED BY ME.

                                    EMPLOYEE:

                                    /s/ Lawrence A. Mueller
                                    -------------------------------------
                                     Lawrence A. Mueller

                                    -------------------------------------
                                    Date

Accepted and Agreed to:

ARIBA, INC.

By: /s/ Keith Krach
    ------------------------------------
     Keith Krach

                                     Page 3

<PAGE>

                                   APPENDIX A

Section 2870. Application of provision providing that employee shall assign or
offer to assign rights in invention to employer.

A. Any provision in an employment agreement which provides that an employee
shall assign, or offer to assign, any of his or her rights in an invention to
his or her employer shall not apply to an Invention that the employee developed
entirely on his or her own time without using the employer's equipment,
supplies, facilities, or trade secret information except for those inventions
that either:

1. Relate at the time of conception or reduction to practice of the invention to
the employer's business, or actual or demonstrably anticipated research or
development of the employer; or

2. Result from any work performed by the employee for his employer.

B. To the extent a provision in an employment agreement purports to require an
employee to assign an invention otherwise excluded from being required to be
assigned under subdivision (a), the provision is against the public policy of
this state and is unenforceable.

                                     Page 4

<PAGE>

                                   APPENDIX B

                 PRIOR MATTER RELATED TO THE COMPANY'S ACTUAL OR
                               PROPOSED BUSINESS

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                                     Page 5

<PAGE>

                                    Exhibit B
                                    ---------

[*]

                                       10

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