X0306 4 2018-05-10 0000749251 GARTNER INC IT 0001308381 Kranich Robin B 56 TOP GALLANT ROAD P.O. BOX 10212 STAMFORD CT 06904-2212 1 EVP, Human Resources Common Stock 2018-05-10 4 M 0 20080 64.64 A 37500 D Common Stock 2018-05-10 4 D 0 9660 134.37 D 27840 D Common Stock 2018-05-10 4 F 0 5546 134.37 D 22294 D Common Stock 2018-05-11 4 S 0 4874 134.89 D 17420 D Stock Appreciation Rights 64.64 2018-05-10 4 M 0 20080 0 D 2015-02-10 2021-02-10 Common Stock 20080 0 D These SARs become exercisable in four substantially equal annual installments commencing on 02/10/2015 and are fully exercisable. Represents the simultaneous sale back to the issuer of this number of shares having an aggregate value, based on the market price on the date of exercise, substantially equal to the aggregate exercise price of the SARs. Represents shares withheld from the settlement of the SARs for the payment of applicable income and payroll tax withholding due upon exercise. This transaction was executed in multiple trades at prices ranging from $134.88 to $134.92. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. /s/ Kevin Tang for Robin B. Kranich 2018-05-14