X0508 4/A 2024-02-15 2024-02-20 0000094049 STEPAN CO SCL 0001738439 Rojo Luis 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK IL 60062 1 VP & Chief Financial Officer 0 Common Stock 2024-02-15 4 M 0 1488 A 9086.375 D This Form 4/A corrects the number of shares received as a result of performance shares vesting. The number of shares reported on the reporting person's Form 4 filed on February 20, 2024 was miscalculated due to an administrative error. Each performance share represents a contingent right to receive one share of Stepan Company common stock. The performance shares vested upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2023. /s/ Stephanie J. Pacitti, Attorney-in-Fact for Luis Rojo 2024-03-08