EXHIBIT 99.1 For Immediate Release MERCER INTERNATIONAL INC. REPORTS FIRST QUARTER 2024 RESULTS AND ANNOUNCES QUARTERLY CASH DIVIDEND OF $0.075 Selected Highlights • First quarter Operating EBITDA* of$63.6 million and net loss of $16.7 million • Improving pulp markets and lower costs driving stronger EBITDA • Quarterly cash dividend of$0.075 per share NEW YORK, NY, May 9, 2024 ‑ Mercer International Inc. (Nasdaq: MERC) today reported first quarter 2024 Operating EBITDA of $63.6 million, an increase from$ ...