Hallador Energy Company

Item 1.01 – Entry into a Material Definitive Agreement On August 11, 2026, Hallador Energy Company (the “Company”) entered into a Third Amendment to Credit Agreement (the “Third Amendment”), by and among the Company, Texas Capital Bank, as administrative agent (the “Administrative Agent”), and the lenders party thereto (the “Lenders”), which amends the Credit Agreement, dated as of March 5, 2026, among the Company, the Administrative Agent and the Lenders party thereto (as amended by the First Amendment, the Second Amendment, and as further amended by the Third Amendment, the “Credit Agreement”). The Third Amendment modifies the definition of "EBITDA" set forth in the Credit Agreement to, among other things, permit the Company to add back to EBITDA certain payments received by the Company or its restricted subsidiaries in respect of power purchase agreement exclusivity agreements during the fiscal quarter ended June 30, 2026, in an aggregate amount not to exceed $10,000,000. The foregoing description of the Amendment is a summary, and does not purport to be complete, and is subject to, and qualified in its entirety by reference to, the Amendment, a copy of which is attached hereto as Exhibit 10.1 and is incorporated herein by reference.

Item 2.03 Creation of Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in Item 1.01 above is hereby incorporated by reference into this Item 2.03.