UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 3)* ART TECHNOLOGY GROUP, INC. -------------------------------------------------------------------------------- (Name of Issuer) Common Stock -------------------------------------------------------------------------------- (Title of Class of Securities) CUSIP NO. 458727 20 3 -------------------------------------------------------------------------------- (CUSIP Number) James H. Dennedy Richard S. Rofe Mitchell-Wright Technology Group, LLC Mitchell-Wright Technology Group, LLC 8060 Montgomery Road, Suite 205 185 Great Neck Road, Suite 460 Cincinnati, OH 45236 Great Neck, NY 11020 -------------------------------------------------------------------------------- (513) 792-5100 (516) 466-5258 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications September 28, 2004 -------------------------------------------------------------------------------- (Date of Event Which Requires Filing of This Statement) If the person filing has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. |_| NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 2 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). SSH Partners I, LLP -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 125,000 --------------------------------- (8) Shared Voting Power 0 --------------------------------- (9) Sole Dispositive Power 125,000 --------------------------------- (10) Shared Dispositive Power 0 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 125,000 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 0.2% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) PN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 3 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Mitchell-Wright Technology Group, LLC 41-2142179 -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 125,000 --------------------------------- (8) Shared Voting Power 0 --------------------------------- (9) Sole Dispositive Power 125,000 --------------------------------- (10) Shared Dispositive Power 0 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 125,000 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 0.2% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 4 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Mitchell-Wright, LLC -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 125,000 --------------------------------- (8) Shared Voting Power 0 --------------------------------- (9) Sole Dispositive Power 125,000 --------------------------------- (10) Shared Dispositive Power 0 ------------------------------------------------------------ ------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 125,000 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 0.2% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 5 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). James Dennedy -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) PF/AF -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization USA -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 145,000 --------------------------------- (8) Shared Voting Power 0 --------------------------------- (9) Sole Dispositive Power 145,000 --------------------------------- (10) Shared Dispositive Power 0 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 145,000 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 0.2% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 6 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Arcadia Partners, L.P. -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 36,744 --------------------------------- (8) Shared Voting Power 0 --------------------------------- (9) Sole Dispositive Power 36,744 --------------------------------- (10) Shared Dispositive Power 0 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 36,744 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 0.0% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) PN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 7 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Arcadia Capital Management, LLC -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 36,744 --------------------------------- (8) Shared Voting Power 0 --------------------------------- (9) Sole Dispositive Power 36,744 --------------------------------- (10) Shared Dispositive Power 0 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 36,744 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 0.0% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 8 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Richard Rofe -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization USA -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 172,244 --------------------------------- (8) Shared Voting Power 0 --------------------------------- (9) Sole Dispositive Power 172,244 --------------------------------- (10) Shared Dispositive Power 0 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 172,244 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 0.2% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 9 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Parche, LLC 20-0870632 -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 643,176 --------------------------------- (9) Sole Dispositive Power --------------------------------- (10) Shared Dispositive Power 643,176 ------------------------------------------------------------ ------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 643,176 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 0.9% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 10 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Starboard Value & Opportunity Fund, LLC -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 3,376,680 --------------------------------- (9) Sole Dispositive Power 0 --------------------------------- (10) Shared Dispositive Power 3,376,680 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 3,376,680 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 4.6% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 11 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Admiral Advisors, LLC -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 4,019,856 --------------------------------- (9) Sole Dispositive Power 0 --------------------------------- (10) Shared Dispositive Power 4,019,856 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 4,019,856 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 5.4% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 12 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Ramius Capital Group, LLC -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 4,019,856 --------------------------------- (9) Sole Dispositive Power 0 --------------------------------- (10) Shared Dispositive Power 4,019,856 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 4,019,856 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 5.4% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 13 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). C4S & Co., LLC -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 4,019,856 --------------------------------- (9) Sole Dispositive Power 0 --------------------------------- (10) Shared Dispositive Power 4,019,856 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 4,019,856 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 5.4% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 14 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Peter A. Cohen -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization USA -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 4,019,856 --------------------------------- (9) Sole Dispositive Power 0 --------------------------------- (10) Shared Dispositive Power 4,019,856 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 4,019,856 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 5.4% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 15 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Morgan B. Stark -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization USA -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 4,019,856 --------------------------------- (9) Sole Dispositive Power 0 --------------------------------- (10) Shared Dispositive Power 4,019,856 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 4,019,856 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 5.4% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 16 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Jeffrey M. Solomon -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization USA -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 4,019,856 --------------------------------- (9) Sole Dispositive Power 0 --------------------------------- (10) Shared Dispositive Power 4,019,856 ------------------------------------------------------------ ------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 4,019,856 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 5.4% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! SCHEDULE 13D CUSIP NO. 458727 20 3 PAGE 17 OF 21 PAGES -------------------------------------------------------------------------------- (1) Names of Reporting Persons. S.S. or Identification Nos. of above persons (entities only). Thomas W. Strauss -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member (a) /x/ of a Group (See Instructions) (b) // -------------------------------------------------------------------------------- (3) Sec Use Only -------------------------------------------------------------------------------- (4) Source of Funds (see instructions) WC -------------------------------------------------------------------------------- (5) Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e). -------------------------------------------------------------------------------- (6) Citizenship or Place of Organization USA -------------------------------------------------------------------------------- Number of Shares Beneficially Owned by Each (7) Sole Voting Power Reporting Person with: 0 --------------------------------- (8) Shared Voting Power 4,019,856 --------------------------------- (9) Sole Dispositive Power 0 --------------------------------- (10) Shared Dispositive Power 4,019,856 -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 4,019,856 -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) // -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 5.4% -------------------------------------------------------------------------------- (14) Type of Reporting Person (See Instructions) IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! ITEM 1. SECURITY AND ISSUER This Amendment No. 3 to Schedule 13D relates to shares of the Common Stock, par value $0.01 per share ("Common Stock"), of Art Technology Group, Inc. (the "Issuer" or the "Company") and is being filed on behalf of the undersigned to amend the Schedule 13D which was originally filed on August 24, 2004, and amended on September 10, 2004 and September 20, 2004 (the "Schedule 13D"). Unless otherwise indicated, all capitalized terms used herein but not defined herein shall have the same meanings as set forth in the Schedule 13D. ITEM 2. IDENTITY AND BACKGROUND This Amendment No. 3 to Schedule 13D is filed by a group consisting of SSH Partners I, LP, Mitchell-Wright Technology Group, LLC, Mitchell-Wright, LLC, James Dennedy, Arcadia Partners, L.P., Arcadia Capital Management, LLC, Richard Rofe, Parche, LLC, Starboard Value & Opportunity Fund, LLC, Admiral Advisors, LLC, Ramius Capital Group, LLC, C4S & Co., LLC, Peter A. Cohen, Morgan B. Stark, Jeffrey M. Solomon, and Thomas W. Strauss (collectively, the "Reporting Persons"). ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION The additional shares of Common Stock purchased by the Reporting Persons since the filing of the Schedule 13D, as described in Item 5 below, were made in open market transactions. All such purchases of Common Stock by each of the Reporting Persons were funded by working capital, which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business. The amount of funds expended for such purchases was $21,000 by Parche, LLC, and approximately $110,000 by Starboard Value & Opportunity Fund, LLC. ITEM 4. PURPOSE OF THE TRANSACTION On September 28, 2004, Mitchell-Wright Technology Group, LLC, Mitchell-Wright, LLC, SSH Partners I, LP, Arcadia Partners, L.P., Arcadia Capital Management, LLC, James Dennedy and Richard Rofe filed a preliminary proxy statement with the Securities and Exchange Commission in connection with their solicitation of proxies against the proposal to issue shares of the Company's common stock in connection with the proposed merger involving the Company and Primus Knowledge Solutions, Inc. at the special meeting of stockholders of the Company to be held on October 22, 2004 and at any adjournments or postponements thereof. SHAREHOLDERS ARE ADVISED TO READ THE PROXY STATEMENT AND OTHER DOCUMENTS RELATED TO SOLICITATION OF PROXIES BY MITCHELL-WRIGHT TECHNOLOGY GROUP, LLC, SSH PARTNERS I, LP, MITCHELL-WRIGHT, LLC, JAMES DENNEDY, ARCADIA PARTNERS, L.P., ARCADIA CAPITAL MANAGEMENT, LLC AND RICHARD ROFE FROM THE SHAREHOLDERS OF ART TECHNOLOGY GROUP, INC. FOR USE AT ITS SPECIAL MEETING WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. WHEN COMPLETED, A DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY WILL BE MAILED TO SHAREHOLDERS OF ART TECHNOLOGY GROUP, INC. AND WILL BE AVAILABLE AT NO CHARGE AT THE SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT HTTP://WWW.SEC.GOV. ITEM 5. INTEREST IN SECURITIES OF THE ISSUER (a), (b) As of September 28, 2004, the aggregate number of shares of Common Stock to which this Schedule 13D relates is 4,337,100 shares, representing 5.9% of the 73,889,870 shares of Common Stock reported by the Company to be issued and outstanding as of September 9, 2004, in its joint proxy statement/prospectus on Form S-4 filed with the Securities and Exchange Commission on September 22, 2004. The Reporting Persons beneficially own those shares as follows: As of the date hereof, Parche, LLC beneficially owns an aggregate of 643,176 shares of Common Stock, representing approximately 0.9% of the shares of Common Stock presently outstanding. In addition, by virtue of the relationships described under Item 2 of this Schedule 13D, each of Admiral Advisors, LLC, Ramius Capital Group, LLC, C4S & Co., Peter A. Cohen, Morgan B. Stark, Jeffrey M. Solomon and Thomas W. Strauss may be deemed to have an indirect beneficial ownership of all the shares of Common Stock beneficially owned by Parche, LLC. As of the date hereof, Starboard Value & Opportunity Fund, LLC beneficially owns an aggregate of 3,376,680 shares of Common Stock, representing approximately 4.6% of the outstanding shares of Common Stock. In addition, by virtue of the relationships described under Item 2 of this Schedule 13D, each of Admiral Advisors, LLC, Ramius Capital Group, LLC, C4S & Co., LLC, Peter A. Cohen, Morgan B. Stark, Jeffrey M. Solomon and Thomas W. Strauss may be deemed to have an indirect beneficial ownership of all the shares of Common Stock beneficially owned by Starboard Value & Opportunity Fund, LLC. Each of Messrs. Cohen, Stark, Solomon and Strauss shares voting and dispositive power with respect to both the 643,176 shares of Common Stock owned by Parche, LLC and the 3,376,680 shares of Common Stock owned by Starboard Value & Opportunity Fund, LLC by virtue of their status as joint managing members of C4S & Co., LLC, the Managing Member of Ramius Capital Group, LLC, which in turn is the Managing Member of Admiral Advisors, LLC, which is the Managing Member of both Parche, LLC and Starboard Value & Opportunity Fund, LLC. Messrs. Cohen, Stark, Solomon, and Strauss, C4S & Co., LLC, Ramius Capital Group, LLC and Admiral Advisors, LLC each disclaim beneficial ownership of the shares of the Issuer's Common Stock held of record by Parche, LLC and Starboard Value & Opportunity Fund, LLC, and the filing of this Schedule 13D shall not be construed as an admission that any such person is the beneficial owner of any such securities. (c) Not applicable (d) Not applicable (e) Not applicable ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER MWTG, Parche, LLC, and Starboard Value and Opportunity Fund, LLC have an agreement pursuant to which MWTG provides advice and services with respect to the parties' investments in the Common Stock of the Issuer, among other matters. Under such agreement, the parties agree to coordinate the acquisition and disposition of Common Stock of the Issuer with MWTG and to cooperate with respect to proxy votes and related matters (however, each of the parties to the agreement retains the sole discretion over acquisitions and dispositions of, and voting authority over, the shares of Common Stock that it holds). For such services, MWTG receives an amount equal to a percentage of the profits realized by such parties on their investment in the Issuer. The parties have also agreed to share expenses incurred by the group. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS None -------------------------------------------------------------------------------- SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. September 28, 2004 SSH Partners I, LP By: Mitchell-Wright Technology Group, LLC, its General Partner /s/ James Dennedy ------------------------------------------ By: James Dennedy Managing Member September 28, 2004 Mitchell-Wright Technology Group, LLC By: Mitchell-Wright, LLC, its Managing Member /s/ James Dennedy ------------------------------------------ By: James Dennedy Managing Member September 28, 2004 Mitchell-Wright, LLC /s/ James Dennedy ------------------------------------------ By: James Dennedy Managing Member September 28, 2004 /s/ James Dennedy ------------------------------------------ James Dennedy -------------------------------------------------------------------------------- September 28, 2004 Arcadia Partners, L.P. By: Arcadia Capital Management, LLC, its General Partner /s/ Richard Rofe ----------------------------------------- By: Richard Rofe Member September 28, 2004 Arcadia Capital Management, LLC /s/ Richard Rofe ----------------------------------------- By: Richard Rofe Member September 28, 2004 /s/ Richard Rofe ----------------------------------------- Richard Rofe September 28, 2004 Parche, LLC By: Admiral Advisors, LLC, its managing member /s/ Jeffrey M. Solomon ----------------------------------------- By: Jeffrey M. Solomon Authorized Signatory September 28, 2004 Starboard Value & Opportunity Fund, LLC By: Admiral Advisors, LLC, its managing member /s/ Jeffrey M. Solomon ----------------------------------------- By: Jeffrey M. Solomon Authorized Signatory September 28, 2004 Ramius Capital Group, LLC By: C4S & Co., LLC, its Managing Member /s/ Jeffrey M. Solomon ------------------------------------------ By:Jeffrey M. Solomon Authorized Signatory September 28, 2004 C4S & Co., LLC /s/ Jeffrey M. Solomon ------------------------------------------ By:Jeffrey M. Solomon Authorized Signatory September 28, 2004 /s/ Peter A. Cohen ------------------------------------------ Peter A. Cohen September 28, 2004 /s/ Morgan B. Stark ------------------------------------------ Morgan B. Stark September 28, 2004 /s/ Jeffrey M. Solomon ------------------------------------------ Jeffrey M. Solomon September 28, 2004 /s/ Thomas W. Strauss ------------------------------------------ Thomas W. Strauss SCHEDULE I This schedule sets forth information with respect to each purchase and sale of Common Stock which was effectuated by a Reporting Person since the filing of the most recent amendment to the Schedule 13D. All transactions were effectuated in the open market through a broker. Parche, LLC ----------- Number of Shares Date Purchased/(Sold) Price Per Share(1) ---- ---------------- ------------------ 9/23/2004 2,400 $0.96 9/24/2004 4,000 $0.96 9/27/2004 5,600 $0.93 9/28/2004 10,400 $0.93 Starboard Value and Opportunity Fund, LLC ----------------------------------------- Number of Shares Date Purchased/(Sold) Price Per Share(1) ---- ---------------- ------------------ 9/23/2004 12,600 $0.96 9/24/2004 21,000 $0.96 9/27/2004 29,400 $0.93 9/28/2004 54,600 $0.93 (1) Excludes commissions and other execution-related costs.