X0508 4 2026-02-09 0000094049 STEPAN CO SCL 0001229289 STEPAN F QUINN JR 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 0 Share Units 2026-02-09 4 M 0 7517.35 D Common Stock 7517.35 35649.518 I By Father's Deferred MIP Share Units are acquired under the Management Incentive Plan ("MIP"), a nonqualified deferred compensation plan that allows participants to defer all or a portion of their annual incentive awards. Share Units convert on a one-for-one basis into Common Stock. Share Units are generally payable at end of employment, unless otherwise elected. Each share unit was the economic equivalent of one share of Stepan Company common stock. On February 9, 2026, 7,517.35 share units were settled in cash. 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. 2026-02-19