ORION S.A. CONTACT: Wendy Wilson Investor Relations Exhibit 99.1 +1 281-974-0155 Orion S.A. Reports First Quarter 2024 Financial Results HOUSTON—May 2, 2024—Orion S.A. (NYSE: OEC), a specialty chemical company, today announced financial results for period ended March 31, 2024 as follows: Three Months 2024 Highlights • Net sales of $502.9 million, up $2.2 million, year over year • Net income of $26.7 million, down $15.6 million, year over year • Diluted EPS of $0.45, down $0.25, year over year • Adjusted EBI ...