X0508 4 2025-12-23 0000094049 STEPAN CO SCL 0001229289 STEPAN F QUINN JR 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 0 Common Stock 2025-12-23 4 G 0 95.858 0 A 126219.262 D Common Stock 159423 D Common Stock 0.002 I By Esop II Trust Common Stock 160000 I By Family LLC Common Stock 0 I By Family Trust Common Stock 2448 I By Family Trust III Common Stock 87500 I By Family Trust IV Common Stock 100 I By Father Common Stock 1017 I By Spouse Common Stock 0 I Member Of Plan Committee Of Stepan Company Common Stock 67.214 I By Father's ESOP Common Stock 19052 I By Family Trust V Common Stock 0 I By Mother's Estate Common Stock 600 I By Family Trust VI Joint Tenancy with Spouse. The reporting person disclaims beneficial ownership of these securities, except to extent of any pecuniary interest in the shares. Shares held by an estate of which the reporting person serves as executor. /s/ James A. Hart, attorney-in-Fact for F. Quinn Stepan, Jr. 2025-12-29