X0508 4 2025-06-02 0 0001333274 MERCER INTERNATIONAL INC. MERC 0001742623 Wallace Alan C. SUITE 1120 700 WEST PENDER STREET VANCOUVER A1 V6C 1G8 BRITISH COLUMBIA, CANADA 1 0 0 0 0 Common Stock 2025-06-02 4 A 0 27933 0 A 59901 D Represents a restricted stock award by Mercer International Inc. ("Mercer") to the Reporting Person under Mercer's non-employee director compensation program and the Amended and Restated 2022 Stock Incentive Plan in respect of the board term commencing May 31, 2025 and ending at its next regularly scheduled annual general meeting in 2026 (the "2026 AGM"). These shares vest on the earlier of the one-year anniversary of the grant date or the date of the 2026 AGM. /s/ Alan C. Wallace 2025-06-03