X0609 4 2026-04-15 0 0001871509 Portillo's Inc. PTLO 0001621955 Patterson Brett false C/O PORTILLO'S INC. 2001 SPRING ROAD, SUITE 400 OAK BROOK IL 60523 1 1 0 0 President & CEO 0 Class A common stock 2026-04-15 4 A 0 271739 0 A 340823 D Represents restricted stock units subject to time-based vesting granted on April 15, 2026, one-third of which vest on each of the first three anniversaries of the grant date, subject to the Reporting Person's continued service with the Issuer and the terms of the applicable award agreement. /s/ Kelly M. Kaiser, as attorney-in-fact for Brett Patterson 2026-04-16