X0607 3 2026-08-04 0 0000094049 STEPAN CO SCL 0001726434 Eaken Matthew John false 22 WEST FRONTAGE ROAD NORTHFIELD IL 60093 1 VP, Controller & PAO Common Stock 9319 D Common Stock 3102 I By ESOP II Trust Stock Option (Right to Buy) 78.58 2018-02-21 2027-02-20 Common Stock 633 D Stock Appreciation Right 78.58 2018-02-21 2027-02-20 Common Stock 1899 D Stock Option (Right to Buy) 72.99 2018-12-31 2028-02-20 Common Stock 862 D Performance Shares Common Stock 596 D Stock Appreciation Right 72.99 2018-12-31 2028-02-20 Common Stock 2585 D Stock Option (Right to Buy) 92.29 2019-12-31 2029-02-19 Common Stock 703 D Performance Shares Common Stock 662 D Stock Appreciation Right 92.29 2019-12-31 2029-02-19 Common Stock 2109 D Stock Option (Right to Buy) 102.30 2020-12-31 2030-02-18 Common Stock 723 D Performance Shares Common Stock 799 D Stock Appreciation Right 102.30 2020-12-31 2030-02-18 Common Stock 2169 D Stock Option (Right to Buy) 123.73 2021-12-31 2031-02-16 Common Stock 514 D Stock Appreciation Right 123.73 2021-12-31 2031-02-16 Common Stock 1541 D Performance Shares Common Stock 336 D Stock Appreciation Right 111.26 2022-12-31 2032-02-15 Common Stock 1167 D Stock Appreciation Right 109.92 2024-02-14 2033-02-14 Common Stock 791 D Restricted Stock Units 2025-03-04 2027-03-04 Restricted Stock Units 119 D Stock Appreciation Right 87.50 2025-03-04 2034-03-04 Common Stock 976 D Performance Shares Common Stock 522 D Restricted Stock Units 2026-03-03 2028-03-03 Restricted Stock Units 696 D Stock Appreciation Right 59.86 2026-03-03 2035-03-03 Common Stock 1474 D Performance Shares Common Stock 624 D Restricted Stock Units 2027-03-02 2029-03-02 Restricted Stock Units 1249 D Stock Appreciation Right 50.06 2027-03-02 2036-03-02 Common Stock 1789 D Vests ratably over three years beginning on the date shown. Each performance share represents a contingent right to receive 1 share of Stepan Company Stock. The performance shares vest upon Stepan Company achieving certain financial targets by December 31, 2021. Each performance share represents a contingent right to receive one share of Stepan Company common stock. Each performance share represents a contingent right to receive one share of Stepan Company Common Stock. The performance shares vest upon Stepan Company achieving certain financial targets by December 31, 2020. Each performance share represents a contingent right to receive 1 share of Stepan Company Stock. The performance shares vest upon Stepan Company achieving certain financial targets by December 31, 2022. Each performance share represents a contingent right to receive 1 share of Stepan Company Stock. The performance shares vest upon Stepan Company achieving certain financial targets by December 31, 2024. 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 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, 2028. /s/ Darina A. Koleva, attorney-in-fact for Mr. Matthew J. Eaken 2026-08-04