X0609 4/A 2026-02-27 2026-03-04 0000094049 STEPAN CO SCL 0001716333 Moriarty Sean Thomas false 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 VP & GM Surfactants 0 Common Stock 2026-02-27 4 A 0 56.765 52.51 A 14205.2335 D Common Stock 4478.351 I By ESOP II Trust Stock Appreciation Right 50.06 2026-03-02 4 A 0 6440 0 A 2027-03-02 2036-03-03 Common Stock 6440 6440 D Performance Shares 2026-03-02 4 A 0 2247 0 A Common Stock 2247 2247 D Restricted Stock Units 2026-03-02 4 A 0 4495 0 A 2027-03-02 2029-03-02 Restricted Stock Units 4495 4495 D 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. Vest 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. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Stepan Company common stock. /s/ James A. Hart, Attorney-in-Fact for Sean T. Moriarty 2026-05-12