X0508 4 2024-11-06 0000094049 STEPAN CO SCL 0001229289 STEPAN F QUINN JR 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 0 Common Stock 2024-11-06 4 G 0 18180 0 D 96741 D Common Stock 2024-11-06 4 G 0 7500 0 D 89241 D Common Stock 2024-11-06 4 G 0 7500 0 A 87500 I By Family Trust IV Common Stock 227776.71 D Share Units Common Stock 77989.365 77989.365 D Joint Tenancy with Spouse. The Reporting Person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for the purpose of Section 16 or for any other purpose. Includes exempt acquisitions under Rule 16a-11 pursuant to dividend reinvestments since the date of the reporting person's last report. 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/ Stephanie J. Pacitti, Attorney-in-Fact for F. Quinn Stepan, Jr. 2024-11-08