SCHEDULE 13G/A 0001644956-25-000006 0001644956 XXXXXXXX LIVE 1 Common Stock 03/31/2025 0001606366 El Pollo Loco Holdings, Inc. 268603107 3535 HARBOR BOULEVARD 3535 HARBOR BOULEVARD COSTA MESA CA 92626 Rule 13d-1(b) WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC DE 934115.00 0.00 1436784.00 0.00 1436784.00 4.8 IA El Pollo Loco Holdings, Inc. 3535 HARBOR BOULEVARD, 3535 HARBOR BOULEVARD, COSTA MESA, CALIFORNIA, 92626. William Blair Investment Management, LLC 150 North Riverside Plaza, Chicago, IL 60606 Delaware N IA 1,436,784 4.8% 934,115 0 1,436,784 0 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Stephanie Braming 05/09/2025