X0609 4/A 2026-02-27 2026-03-04 0000094049 STEPAN CO SCL 0001976755 Haire Robert Joseph false 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 EVP, Supply Chain 0 Common Stock 2026-02-27 4 A 0 56.765 52.51 A 2538.765 D Common Stock 90.269 I By ESOP II Trust Restricted Stock Units 2026-03-02 4 A 0 5993 0 A 2027-03-02 2029-03-02 Restricted Stock Units 5993 5993 D Performance Shares 2026-03-02 4 A 0 2996 0 A Common Stock 2996 2996 D Stock Appreciation Right 50.06 2026-03-02 4 A 0 8586 0 A 2027-03-02 2036-03-03 Common Stock 8586 8586 D Each RSU represents a contingent right to receive one share of Stepan Company common stock. Vest ratably over three years beginning on the date shown. 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. /s/ James A. Hart, attorney-in-fact for Robert Haire 2026-05-12