X0609 4/A 2026-02-27 2026-03-04 0000094049 STEPAN CO SCL 0001839533 Stepan Richard Finn false 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 V.P. and Gen'l. Mgr., Polymers 0 Common Stock 2026-02-27 4 A 0 56.765 52.51 A 241395.915 D Common Stock 43439 I By Daughter Common Stock 43439 I By Daughter Common Stock 43439 I By Son Common Stock 5174 I By Spouse Common Stock 95416 I By Trust Common Stock 1238.22 I By ESOP II Trust Restricted Stock Units 2026-03-02 4 A 0 4994 0 A 2027-03-02 2029-03-02 Restricted Stock Units 4994 4994 D Performance Shares 2026-03-02 4 A 0 2497 0 A Common Stock 2497 2497 D Stock Appreciation Right 50.06 2026-03-02 4 A 0 7155 0 A 2027-03-02 2036-03-03 Common Stock 7155 7155 D 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. 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. This Form 4/A amends the reporting person's original Form 4 filed on March 4, 2026 (the "Original Filing"). The Original Filing inadvertently reported an incorrect stock appreciation right ("SAR") conversion/exercise price due to an administrative error in the pricing calculation. The correct conversion/exercise price for the reported transaction is $50.06 not $17.47 as previously reported. This amendment corrects the reported conversion/exercise price. No other aspects of the reported transaction are affected. Vests ratably over three years beginning on the date shown. /s/ James A. Hart, attorney-in-fact for Mr. Richard Stepan 2026-05-12