X0306 4 2017-02-09 0000749251 GARTNER INC IT 0001610073 Safian Craig 56 TOP GALLANT ROAD STAMFORD CT 06904 1 SVP & CFO Common Stock 2017-02-09 4 M 0 4321 0 A 21716 D Common Stock 2017-02-09 4 F 0 1598 100.27 D 20118 D Common Stock 2017-02-10 4 M 0 1740 0 A 21858 D Common Stock 2017-02-10 4 F 0 801 101.02 D 21057 D Common Stock 2017-02-12 4 M 0 2025 0 A 23082 D Common Stock 2017-02-12 4 F 0 1045 101.02 D 22037 D Restricted Stock Units 0 2017-02-09 4 M 0 4321 0 D Common Stock 4321 8641 D Restricted Stock Units 0 2017-02-10 4 M 0 1740 0 D Common Stock 1740 1740 D Restricted Stock Units 0 2017-02-12 4 M 0 2025 0 D Common Stock 2025 0 D Represents shares acquired upon release of RSUs. These RSUs vest in substantially equal installments, commencing on 02/09/2016. Represents the 2017 installment. These RSUs vest in substantially equal installments, commencing on 02/10/2015. Represents the 2017 installment. These RSUs vest in substantially equal installments, commencing on 02/12/2014. Represents the 2017 installment. Represents shares withheld from released RSUs for the payment of applicable income and payroll withholding taxes due on release. /s/ Clare Kretzman for Craig Safian 2017-02-13