X0202 SCHEDULE 13G/A 0002095680 XXXXXXXX LIVE 1 Common Stock 06/30/2026 0000788965 Hallador Energy Co 40609P105 1183 East Canvasback Drive Terra Haute IN 47802 Rule 13d-1(c) Mark D. Becker X1 1437573 0 1437573 0 1437573 N 3.0 IN (1) Rows 5, 7 and 9: Consists of (i) 180,745 shares of Common Stock, par value $0.01 per share ("Common Stock"), of Hallador Energy Co (the "Company") held of record by The MDB Irrevocable Trust Dated March 24, 2023, for which Mr. Becker has sole voting and dispositive power, and (ii) 1,256,828 shares of Common Stock held of record by The Mark D. Becker Living Trust Dated March 29, 2021, for which Mr. Becker has sole voting and dispositive power. (2) Row 11: Percentage ownership is based on 47,143,357 shares of Common Stock outstanding as of August 6, 2026, as reported in the Company's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 10, 2026. Hallador Energy Co 1183 East Canvasback Drive, Terre Haute, Indiana 47802 Mark D. Becker 4234 E. Indian School Road, Phoenix, Arizona 85018 The Reporting Person is a citizen of the United States of America. Y See Row 9 of cover page. See Row 11 of cover page. See Row 5 of cover page. See Row 6 of cover page. See Row 7 of cover page. See Row 8 of cover page. N Y Y 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. Mark D. Becker /s/ Mark D. Becker 08/11/2026