X0609 4 2026-05-11 0000094049 STEPAN CO SCL 0002124351 Weitkamp Robin Joseph false 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 VP and GM Surfactants-INT 0 Common Stock 2026-05-11 4 M 0 90 52.58 A 90 D Common Stock 2026-05-11 4 F 0 50 52.58 D 40 D Common Stock 96.9 I By ESOP II Trust Restricted Stock Units 2026-05-11 4 M 0 90 0 D 2025-05-10 2027-05-10 Restricted Stock Units 90 190 D The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award. Withholding of shares to satisfy tax liability on the vesting of RSUs. Each RSU represents a contingent right to receive one share of Stepan Company common stock. Vests ratably over three years beginning on the date shown. /s/ James A. Hart, attorney-in-fact for Mr. Robin J. Weitkamp 2026-05-12