X0202 4 2005-02-10 0 0000749251 GARTNER INC IT 0001129787 VA PARTNERS LLC 435 PACIFIC AVENUE FOURTH FLOOR SAN FRANCISCO CA 94133 1 0 1 0 0001159187 UBBEN JEFFREY W 435 PACIFIC AVENUE, FOURTH FLOOR SAN FRANCISCO CA 94133 1 0 1 0 0000937541 KAMIN PETER H TWO INTERNATIONAL PLACE, 25TH FLOOR BOSTON MA 02110 0 0 1 0 NEW Class A Common Stock 2005-02-10 4 P 0 100400 9.25 A 11296300 I See Footnotes NEW Class A Common Stock 2005-02-11 4 P 0 144200 9.43 A 11440500 I See Footnotes NEW Class A Common Stock 2005-02-14 4 P 0 100000 9.42 A 11540500 I See Footnotes NEW Class A Common Stock 2005-02-14 4 P 0 51500 9.41 A 11592000 I See Footnotes As General Partner of ValueAct Capital Master Fund, L.P. and ValueAct Capital Partners Co-Investors, L.P. The reported stock is owned directly by ValueAct Capital Master Fund, L.P. and ValueAct Capital Partners Co-Investors, L.P. and indirectly by VA Partners, LLC as general partner of ValueAct Capital Master Fund, L.P. and ValueAct Capital Partners Co-Investors, L.P. Jeffrey W. Ubben is a director of Gartner Group, Inc. and Managing Member of VA Partners, LLC, the General Partner. Peter H. Kamin and George F. Hamel are Managing Members of VA Partners, LLC, The General Partner. The reporting persons disclaim beneficial ownership of the reported stock except to the extent of their pecuniary interest therein. Joint Filer Information Name: ValueAct Capital Master Fund, L.P. Address: 435 Pacific Avenue, Fourth Floor, San Francisco, CA 94133 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: February 10, 2005 Name: ValueAct Capital Partners Co-Investors, L.P. Address: 435 Pacific Avenue, Fourth Floor, San Francisco, CA 94133 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: February 10, 2005 Name: Jeffrey W. Ubben Address: 435 Pacific Avenue, Fourth Floor, San Francisco, CA 94133 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: February 10, 2005 Name: George F. Hamel, Jr. Address: 435 Pacific Avenue, Fourth Floor, San Francisco, CA 94133 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: February 10, 2005 Name: Peter H. Kamin Address: 435 Pacific Avenue, Fourth Floor, San Francisco, CA 94133 Designated Filer: VA Partners, L.L.C. Issuer and Ticker Symbol: Gartner Group, Inc. (IT) Date of Event Requiring Statement: February 10, 2005 VALUEACT CAPITAL MASTER FUND, L.P., BY VA PARTNERS, L.L.C., ITS GENERAL PARTNER, By: /s/ George F. Hamel, Jr., Managing Member 2005-02-14 VALUEACT CAPITAL PARTNERS CO-INVESTORS, L.P., BY VA PARTNERS, L.L.C., ITS GENERAL PARTNER, By: /s/ George F. Hamel, Jr., Managing Member 2005-02-14 VA PARTNERS, L.L.C., By: /s/ George F. Hamel, Jr., Managing Member 2005-02-14 By: /s/ Jeffrey W. Ubben 2005-02-14 By: /s/ George F. Hamel, Jr. 2005-02-14 By: /s/ Peter H. Kamin 2005-02-14