X0508 4 2026-02-06 0000749251 GARTNER INC IT 0001843710 Genovese Yvonne 56 TOP GALLANT ROAD STAMFORD CT 06902 1 EVP, Bus. & Tech. Insights 0 Common Stock 2026-02-06 4 M 0 576 0 A 5465 D Common Stock 2026-02-06 4 F 0 171 156.33 D 5294 D Common Stock 2026-02-08 4 M 0 850 0 A 6144 D Common Stock 2026-02-08 4 F 0 187 156.33 D 5957 D Restricted Stock Units 0 2026-02-06 4 M 0 576 0 D Common Stock 576 1727 D Restricted Stock Units 0 2026-02-08 4 M 0 850 0 D Common Stock 850 1700 D Represents shares acquired upon the release of the performance-based RSUs awarded on February 6, 2025 and certified in February 2026. These performance-based RSUs convert into common stock on a one-for-one basis and vest in four substantially equal annual installments commencing on February 6, 2026. This represents the 2026 installment. Represents shares withheld for the payment of applicable income and payroll withholding taxes. Represents shares acquired upon the release of RSUs, which convert into common stock on a one-for-one basis. These RSUs vest in four substantially equal annual installments commencing on February 8, 2025. This represents the 2026 installment. /s/ Kevin Tang for Yvonne Genovese 2026-02-10