X0607 3 2026-04-01 0 0000094049 STEPAN CO SCL 0002124351 Weitkamp Robin Joseph false 1101 SKOKIE BLVD, SUITE 500 NORTHBROOK IL 60062 1 VP and GM Surfactants-INT Common Stock 96.9 I By ESOP II Trust Restricted Stock Units 2025-05-10 2027-05-10 Restricted Stock Units 280 D Stock Appreciation Right 89.53 2025-05-10 2034-05-09 Common Stock 1128 D Performance Shares Common Stock 626 D Restricted Stock Units 2026-03-03 2028-03-03 Restricted Stock Units 836 D Stock Appreciation Right 59.86 2026-03-03 2035-03-02 Common Stock 1769 D Performance Shares Common Stock 749 D Restricted Stock Units 2027-03-02 2029-03-02 Restricted Stock Units 1498 D Stock Appreciation Right 50.06 2026-03-02 2036-03-01 Common Stock 2147 D Vests ratably over three years beginning on the date shown. Each restricted stock unit ("RSU") 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, 2027. 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. The performance shares vest upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2028. /s/ James A. Hart, attorney-in-fact for Mr. Robin J. Weitkamp 2026-04-09