X0508 4/A 2026-02-27 2026-03-04 0000094049 STEPAN CO SCL 0001716333 Moriarty Sean Thomas 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 VP & GM Surfactants 0 Common Stock 2026-02-27 4 A 0 56.765 52.51 A 14205.2335 D Common Stock 4478.351 I By ESOP II Trust Stock Appreciation Right 17.47 2026-03-02 4 A 0 6440 0 A 2027-03-02 2036-03-03 Common Stock 6440 6440 D Performance Shares 2026-03-02 4 A 0 2247 0 A Common Stock 2247 2247 D Restricted Stock Units 2026-03-02 4 A 0 4495 0 A 2027-03-02 2029-03-02 Restricted Stock Units 4495 4495 D Vest ratably over three years beginning on the date shown. The Reporting Person's Form 4 filed on March 4, 2026 included an incorrect Stock Appreciation Right amount which has been corrected herein. Each performance share represents a contingent right to receive one share of Stepan Company common stock. The performance shares vest upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2028. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Stepan Company common stock. /s/ James A. Hart, Attorney-in-Fact for Sean T. Moriarty 2026-03-05