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☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( D ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Grand Duchy of Luxembourg ( State or other jurisdiction of incorporation or organization ) Commission file number 001-36563 ORION ENGINEERED CARBONS S.A. ( Exact name of registrant as specified in its charter ) 4501 Magnolia Cove Drive Suite 106 Houston , ( Address of Principal Executive Offices ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Shares , no par value Texas ( 281 ) 318-2959 Registrant's telephone number , including area code Trading Symbol ( s ) OEC Securities registered pursuant to section 12 ( g ) of the Act : to none 00-0000000 ( I.R.S. Employer Identification No. ) 1 77345 ( Zip Code ) Name of each exchange on which registered New York Stock Exchange Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes x No 0 Yes o No X Indicate by check mark whether the registrant : ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) ; and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes x No O Indicate by check mark whether the registrant has electronically submitted every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes x No 0