Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______ to _______ Commission File No.: 000-51826 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Securities registered pursuant to Section 12(b) of the Act: MERCER INTERNATIONAL INC. (Exact name of Registrant as spec ...