X0508 4 2025-05-12 0000094049 STEPAN CO SCL 0001229289 STEPAN F QUINN JR 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 0 Common Stock 2025-05-12 4 A 0 2500 54.262 A 105445.738 D Common Stock 174923 D Share Units Common Stock 63404.923 63404.923 D Joint Tenancy with Spouse. Share Units are acquired under the Management Incentive Plan (As Amended and Restated Effective January 1, 2015) ("MIP"), a nonqualified deferred compensation plan which allows MIP participants to elect to defer all or a portion of their deferred compensation into accounts pursuant to MIP provisions. Share Units convert on a one-for-one basis into Common Stock. Share Units are generally payable at end of employment, unless otherwise elected. /s/ James A. Hart, attorney-in-Fact for F. Quinn Stepan, Jr. 2025-05-13