Orion Engineered Carbons (OEC) 10-K 2023 FY Annual report

Exhibit 32.1

Certification pursuant to

18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of Orion S.A. in Form 10-K for the annual period ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Corning Painter, Chief Executive Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 14, 2024                        /s/ Corning F. Painter

Chief Executive Officer