X0508 4 2025-06-02 0 0001333274 MERCER INTERNATIONAL INC. MERC 0001607859 CORRICK THOMAS KEVIN SUITE 1120 700 WEST PENDER STREET VANCOUVER A1 V6C 1G8 BRITISH COLUMBIA, CANADA 1 0 0 0 0 Deferred Stock Units 2025-06-02 4 A 0 27933 A Common Stock 27933 50008 D Represents deferred stock units ("DSUs") issued by Mercer International Inc. ("Mercer) as a grant to the Reporting Person under Mercer's non-employee director compensation program and 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"). Each DSU vests on the earlier of the one year anniversary of the grant date or the date of the 2026 AGM and represents the right to receive one share of Mercer's common stock and dividend equivalents after the Reporting Person ceases to be a director of Mercer, unless deferred in accordance with its terms. /s/ Thomas Kevin Corrick 2025-06-03