X0508 4 2025-02-14 0000094049 STEPAN CO SCL 0001716333 Moriarty Sean Thomas 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 VP & GM Surfactants 0 Common Stock 2025-02-14 4 M 0 455 62.435 A 12190.9285 D Common Stock 2025-02-14 4 F 0 158 62.435 D 12032.9285 D Common Stock 2025-02-18 4 M 0 1937 A 13969.9285 D Common Stock 4420.939 I By ESOP II Trust Share Units Common Stock 5751.281 5751.281 D Restricted Stock Units 2025-02-14 4 M 0 455 0 D 2024-02-14 2026-02-14 Restricted Stock Units 455 455 D Performance Shares 2025-02-18 4 M 0 2157 D Common Stock 2157 0 D The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award. Withholding of shares to satisfy tax liability on the vesting of RSUs. Each performance share represents a contingent right to receive one share of Stepan Company common stock. The performance shares vested upon the certification of Stepan Company achieving certain performance goals for the performance period ended December 31, 2024. Includes exempt acquisitions under Rule 16a-11 pursuant to dividend reinvestments since the date of the reporting person's last report. Includes exempt acquisitions under Rule 16b-3(c) and Rule 16b-3(d) since the date of the reporting person's last report. Share Units 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 owned under the MIP are generally payable at end of employment, unless otherwise elected. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Stepan Company common stock. Vests ratably over three years beginning on the date shown. /s/ Stephanie J. Pacitti, Attorney-in-Fact for Sean T. Moriarty 2025-02-19