X0202 SCHEDULE 13G/A 0001164508-25-000010 0001164508 XXXXXXXX LIVE 1 Common Shares 03/31/2026 0001341335 Fortuna Mining Corp 349942102 1111 Melville Street, Suite 820 Vancouver A1 V6E 3V6 Rule 13d-1(b) Arrowstreet Capital, Limited Partnership MA 12433039.00 0 15116413.00 0 15116413.00 5.0 IA Arrowstreet Capital Holding LLC DE 12433039.00 0 15116413.00 0 15116413.00 5 HC Fortuna Mining Corp 1111 Melville Street, Suite 820, Vancouver, British Columbia, V6E 3V6, Canada Arrowstreet Capital, Limited Partnership ("ASC") Arrowstreet Capital Holding LLC ("ACH") 200 Clarendon Street, Boston, Massachusetts, 02116, United States ASC: Massachusetts ACH: Delaware N IA HC 15,116,413 ASC: 5.0% ACH: 5.0% 12,433,039 0 15,116,413 0 N Y N This Schedule is filed by ASC, in its capacity as investment adviser to a number of its investment advisory clients, and by ACH, in its capacity as the ultimate parent company of ASC. The securities to which this Schedule relate are held by investment advisory clients of ASC. The securities to which this Schedule relates are held by investment advisor clients of ASC. No such investment advisory client of ASC is known by ASC or by ACH to hold more than five percent of the class of securities to which this schedule relates. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and 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. Arrowstreet Capital, Limited Partnership Kimberly Kelley 05/15/2026 Arrowstreet Capital Holding LLC Eric Burnett 05/15/2026