X0508 4 2026-02-19 0 0001609804 Orion S.A. OEC 0001797804 Niewiem Sandra C/O ORION ENGINEERED CARBONS LLC 1700 CITY PLAZA DRIVE, SUITE 300 SPRING TX 77389 0 1 0 0 Sr. VP Global Specialties 0 Common Shares, no par value 2026-02-19 4 F 0 2662 6.27 D 24255 D Common Shares, no par value 2026-02-19 4 A 0 5952 0 A 30207 D Common Shares, no par value 2026-02-19 4 F 0 2827 6.27 D 27380 D Shares withheld by the Issuer to satisfy tax withholding requirements on vesting of restricted stock units. Represents the vesting and settlement of performance-based restricted stock units in shares of common stock following the satisfaction of certain performance criteria. Shares withheld by the Issuer to satisfy tax withholding requirements on vesting of performance-based restricted stock units. /s/ Sandra Niewiem 2026-02-23