X0306 4 2019-05-24 0000749251 GARTNER INC IT 0001185567 GRABE WILLIAM O 56 TOP GALLANT RD P.O. BOX 10212 STAMFORD CT 06904-2212 1 Common Stock 2019-05-24 4 M 0 1828 0 A 2112 D Common Stock 101499 I 2017 GRAT Common Stock 31526 I 2018 GRAT Restricted Stock Units 0 2019-05-24 4 M 0 1828 0 D Common Stock 1828 0 D This award vested in its entirety on May 24, 2019. These shares are held in a grantor retained annuity trust created on September 15, 2017 when the reporting person transferred 130,622 Gartner shares to the trust (the "2017 GRAT"). These shares are held in trust for the benefit of the reporting person and his children. On September 14, 2018, 29,123 shares were distributed from the 2017 GRAT to the reporting person. The reporting person is the Trustee of the 2017 GRAT. These shares are held in a grantor retained annuity trust created on November 14, 2018 when the reporting person transferred 31,526 Gartner shares to the trust (the "2018 GRAT"). These shares are held in trust for the benefit of the reporting person and his children. The reporting person is the Trustee of the 2018 GRAT. /s/ Kevin Tang for William O. Grabe 2019-05-29