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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

X0202 SCHEDULE 13D/A 0001193805-10-000792 0000897485 XXXXXXXX LIVE 11 Common Stock, par value $1.00 05/19/2026 false 0001333274 588056101 MERCER INTERNATIONAL INC. Suite 1120, 700 West Pender Street Vancouver A1 V6C 1G8 Peter R. Kellogg (212) 389-5841 48 Wall Street, 30th Floor New York NY 10005 0000897485 N Peter R. Kellogg OO N X1 25380929.00 0.00 25380929.00 0.00 24469540.00 N 37.9 IN Common Stock, par value $1.00 MERCER INTERNATIONAL INC. Suite 1120, 700 West Pender Street Vancouver A1 V6C 1G8 As of the close of business on May 19, 2026, Mr. Kellogg beneficially owned an aggregate of 25,380,929 shares, constituting approximately 37.9% of the shares outstanding. As of the close of business on May 19, 2026, Mr. Kellogg beneficially owned an aggregate of 25,380,929 shares, constituting approximately 37.9% of the shares outstanding. During May 12, 2026 through May 19, 2026, entities controlled by Mr. Kellogg purchased an aggregate of 1,000,000 shares at prices ranging from approximately $0.84 to $0.96 per share through the Nasdaq Stock Market. All such transactions have been reported on a Form 4 filed by Mr. Kellogg. Peter R. Kellogg /s/ Marguerite Gorman Marguerite Gorman, attorney-in-fact 05/19/2026