Exhibit 99.1 1 Stepan Reports Third Quarter 2024 Results Northbrook, Illinois, October 30, 2024 -- Stepan Company (NYSE: SCL) today reported: Third Quarter 2024 Highlights • Reported net income was $23.6 million, up 88% versus prior year. Adjusted net income(1) was $23.7 million, up 61% versus prior year, largely due to higher margins and a lower effective tax rate. The year-over-year change in effective tax rate positively impacted net income by $6.8 million, or $0.30 per diluted share. • EBITDA(2) was $53 ...