X0201 4 2003-09-09 0 0000749251 GARTNER INC IT 0001129787 VA PARTNERS LLC ONE MARITIME PLAZA STE 1400 SAN FRANCISCO CA 94111 0 0 1 0 NEW CL A Common Stock 2003-09-09 4 P 0 11800 11.3 A 8006400 I see footnote NEW CL A Common Stock 2003-09-10 4 P 0 33800 11.23 A 8040200 I see footnote As General Partner and Investment Manager of ValueAct Capital Partners, L.P., ValueAct Capital Partners II, L.P., and ValueAct Capital International, Ltd. These securities are also beneficially owned by Jeffrey W. Ubben, George F. Hamel, Jr., and Peter H. Kamin as Managing Members, Principal Owners and Controlling Persons of VA Partners, LLC. Joint Filer Information Name: ValueAct Capital Partners, L.P. Address: One Maritime Plaza, Suite 1400, San Francisco, CA 94111 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: September 9, 2003 Name: ValueAct Capital Partners II, L.P. Address: One Maritime Plaza, Suite 1400, San Francisco, CA 94111 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: September 9, 2003 Name: ValueAct Capital International, Ltd. Address: One Maritime Plaza, Suite 1400, San Francisco, CA 94111 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: September 9, 2003 Name: Jeffrey W. Ubben Address: One Maritime Plaza, Suite 1400, San Francisco, CA 94111 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: September 9, 2003 Name: George F. Hamel, Jr. Address: One Maritime Plaza, Suite 1400, San Francisco, CA 94111 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: September 9, 2003 Name: Peter H. Kamin Address: One Maritime Plaza, Suite 1400, San Francisco, CA 94111 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: September 9, 2003 VALUEACT CAPITAL PARTNERS, L.P., BY VA PARTNERS, L.L.C., ITS GENERAL PARTNER By: /s/ George F. Hamel, Jr, Managing Member 2003-09-11 VALUEACT CAPITAL PARTNERS II, L.P., BY VA PARTNERS, L.L.C., ITS GENERAL PARTNER By: /s/ George F. Hamel, Jr., Managing Member 2003-09-11 VALUEACT CAPITAL INTERNATIONAL, LTD., BY VA PARTNERS, L.L.C., ITS INVESTMENT MANAGER By: /s/ George F. Hamel, Jr., Managing Member 2003-09-11 VA PARTNERS, L.L.C. By: /s/ George F. Hamel, Jr., Managing Member 2003-09-11 VA PARTNERS, L.L.C. By: /s/ Jeffrey W. Ubben, Managing Member 2003-09-11 VA PARTNERS, L.L.C. By: /s/ Peter H. Kamin, Managing Member 2003-09-11