X0607 3 2026-04-01 0 0000094049 STEPAN CO SCL 0002124300 Galimberti Afonso Adriano Jose false 1101 SKOKIE BLVD, SUITE 500 NORTHBROOK IL 60062 1 VP and GM Surfactants NA Common Stock 2894.2619 D Common Stock 615.237 I BY ESOP II Trust Stock Option (Right to Buy) 92.29 2019-12-31 2029-02-19 Common Stock 282 D Stock Option (Right to Buy) 102.30 2020-12-31 2030-02-18 Common Stock 868 D Stock Appreciation Right 102.30 2020-12-31 2030-02-18 Common Stock 2603 D Stock Option (Right to Buy) 123.73 2021-12-31 2031-02-16 Common Stock 617 D Stock Appreciation Right 123.73 2021-12-31 2031-02-16 Common Stock 1850 D Stock Appreciation Right 111.26 2022-12-31 2032-02-15 Common Stock 1401 D Stock Appreciation Right 109.92 2024-02-14 2033-02-14 Common Stock 1107 D Restricted Stock Units 2025-03-04 2027-03-04 Restricted Stock Units 167 D Stock Appreciation Right 87.50 2025-03-04 2034-03-04 Common Stock 1366 D Performance Shares Common Stock 731 D Restricted Stock Units 2026-03-03 2028-03-03 Restricted Stock Units 975 D Stock Appreciation Right 59.86 2026-03-03 2035-03-03 Common Stock 2064 D Performance Shares Common Stock 874 D Restricted Stock Units 2027-03-02 2029-03-02 Restricted Stock Units 1748 D Stock Appreciation Right 50.06 2027-03-02 2036-03-02 Common Stock 2504 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. /s/ James A. Hart, attorney-in-fact for Mr. Adriano Jose Galimberti Afonso 2026-04-10