144 0001964065 XXXXXXXX LIVE 0000749251 GARTNER INC 001-14443 56 TOP GALLANT RD P O BOX 10212 STAMFORD CT 06902-7700 2039640096 Wartinbee William James III Officer Common Morgan Stanley Smith Barney LLC Executive Services

1 NEW YORK PLAZA, 8TH FLOOR NEW YORK NY 10004

538 241609.83 76966937 05/13/2025 NYSE COMMON 02/10/2024 RESTRICTED STOCK ISSUER N 332 02/10/2024 NOT APPLICABLE COMMON 02/09/2024 RESTRICTED STOCK ISSUER N 206 02/09/2024 NOT APPLICABLE Y 05/13/2025 /s/ William James Wartinbee