X0508 4 2024-03-08 0000094049 STEPAN CO SCL 0001780101 Keiper Jason Scott 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 VP & Chief Tech & Sust Officer 0 Common Stock 2024-03-08 4 F 0 230 87.53 D 6522.858 D The transaction reported reflects the withholding of shares from the performance shares vested on February 15, 2024. Withholding of these shares was applied to the reporting person's account on the transaction date shown. /s/ Stephanie J. Pacitti, Attorney-in-Fact for Jason Scott Keiper 2024-03-11