144 0001246335 XXXXXXXX LIVE 0000749251 GARTNER INC 001-14443 56 TOP GALLANT ROAD P.O. BOX 10212 STAMFORD CT 6904-2212 2039640096 ANNE SUTHERLAND FUCHS DIRECTOR COMMON STOCK Truist Securities

3333 Peachtree Road, N.E. Atlanta Financial Center, 9th Floor Atlanta GA 30326

893 303035.77 79042049 06/07/2023 NYS COMMON STOCK 02/14/2006 COMPENSATION FOR PAST SERVICES GARTNER INC N 5129 02/14/2006 COMPENSATION COMMON STOCK 11/01/2006 COMPENSATION FOR PAST SERVICES GARTNER INC N 3351 11/01/2006 COMPENSATION COMMON STOCK 08/20/2010 COMPENSATION FOR PAST SERVICES GARTNER INC N 4476 08/20/2010 COMPENSATION COMMON STOCK 10/03/2011 COMPENSATION FOR PAST SERVICES GARTNER INC N 266 10/03/2011 COMPENSATION COMMON STOCK 01/03/2012 COMPENSATION FOR PAST SERVICES GARTNER INC N 252 01/03/2012 COMPENSATION COMMON STOCK 06/02/2012 COMPENSATION FOR PAST SERVICES GARTNER INC N 656 06/02/2012 COMPENSATION COMMON STOCK 06/02/2012 COMPENSATION FOR PAST SERVICES GARTNER INC N 2762 06/02/2012 COMPENSATION COMMON STOCK 05/30/2019 COMPENSATION FOR PAST SERVICES GARTNER INC N 74 05/30/2019 COMPENSATION COMMON STOCK 04/01/2020 COMPENSATION FOR PAST SERVICES GARTNER INC N 124 04/01/2020 COMPENSATION COMMON STOCK 06/03/2022 COMPENSATION FOR PAST SERVICES GARTNER INC N 279 06/03/2022 COMPENSATION COMMON STOCK 07/01/2022 COMPENSATION FOR PAST SERVICES GARTNER INC N 47 07/01/2022 COMPENSATION COMMON STOCK 10/03/2022 COMPENSATION FOR PAST SERVICES GARTNER INC N 41 10/03/2022 COMPENSATION COMMON STOCK 01/03/2023 COMPENSATION FOR PAST SERVICES GARTNER INC N 34 01/03/2023 COMPENSATION COMMON STOCK 04/03/2023 COMPENSATION FOR PAST SERVICES GARTNER INC N 47 04/03/2023 COMPENSATION COMMON STOCK 06/02/2023 COMPENSATION FOR PAST SERVICES GARTNER INC N 893 06/02/2023 COMPENSATION Y 06/07/2023 /s/ Anne S. Fuchs