X0609 4 2026-04-01 0000749251 GARTNER INC IT 0001185567 GRABE WILLIAM O false 56 TOP GALLANT RD P.O. BOX 10212 STAMFORD CT 06904-2212 1 0 Common Stock 2026-04-01 4 J 0 157 0 A 491 D Common Stock 47900 I 2025 GRAT Common Stock 235 I Family Trust 1 Common Stock 235 I Family Trust 2 Common Stock 1410 I Family Trust 3 Common Stock Equivalents (CSE) 0 2026-04-01 4 A 0 157 154.79 A Common Stock 157 47354 D Common Stock Equivalents (CSE) 0 2026-04-01 4 J 0 157 0 D Common Stock 157 47197 D This reporting person has elected to receive an immediate distribution of the CSE shares. These shares are held in a grantor retained annuity trust created on August 22, 2025 when the reporting person transferred 50,000 Gartner shares to the trust (the "2025 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 2025 GRAT. These are Common Stock Equivalents ("CSEs") received as compensation for service as an outside director of Gartner, Inc. They were granted under the Gartner, Inc. Long-Term Incentive Plan ("LTIP"). The CSEs convert into Gartner common stock on the date the outside director's continuous status as a director terminates, or as otherwise provided in the LTIP. /s/ Kevin Tang for William O. Grabe 2026-04-03