X0202 SCHEDULE 13G 0001257391 XXXXXXXX LIVE Common Stock, par value $1.00 per share 08/07/2026 0001333274 MERCER INTERNATIONAL INC. 588056101 Suite 1120 700 West Pender Street Vancouver A1 V6C 1G8 Rule 13d-1(c) WHITEBOX ADVISORS LLC b DE 0 3590350 0 3590350 3590350 N 5.4 IA WHITEBOX GENERAL PARTNER LLC b DE 0 3590350 0 3590350 3590350 N 5.4 OO MERCER INTERNATIONAL INC. Suite 1120, 700 West Pender Street, Vancouver, British Columbia, Canada, V6C 1G8 This statement is filed by: (i) Whitebox Advisors LLC, a Delaware limited liability company ("WA"); and (ii) Whitebox General Partner LLC, a Delaware limited liability company ("WGP" and, together with WA, the "Reporting Persons"). The address of the business office of WA and WGP is: 3033 Excelsior Boulevard Suite 500 Minneapolis, MN 55416 WA and WGP are organized under the laws of the State of Delaware. Y As of the date hereof, each of WA and WGP is deemed to be the beneficial owner of 3,590,350 shares of Common Stock, as a result of WA's clients' ownership of 3,590,350 shares of Common Stock. As of the date hereof, each of WA and WGP is deemed to beneficially own approximately 5.4% of the shares of Common Stock outstanding. Percent of class was calculated based on 67,018,033 shares of Common Stock outstanding as of August 4, 2026, as reported in the Issuer's quarterly report on Form 10-Q filed with the Securities and Exchange Commission on August 6, 2026. WA and WGP: 0 WA and WGP: 3,590,350 WA and WGP: 0 WA and WGP: 3,590,350 Y N WA's clients are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Common Stock covered by this Statement that may be deemed to be beneficially owned by the Reporting Persons. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Exhibit A - Joint Filing Agreement, dated August 14, 2026, by and among the Reporting Persons WHITEBOX ADVISORS LLC /s/ Muqu Karim 08/14/2026 WHITEBOX GENERAL PARTNER LLC /s/ Muqu Karim 08/14/2026