Hallador Energy Company

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 28, 2026

Hallador Energy Company

(Exact name of registrant as specified in its charter)


Colorado	001-34743	84-1014610
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

1183 East Canvasback Drive, Terre Haute, Indiana 47802

(Address, including zip code, of principal executive offices)

Registrant’s telephone number, including area code: (812) 299-2800.

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:


☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol	Name of each exchange on which registered
Common Shares, $.01 par value	HNRG	Nasdaq

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 1.04 Mine Safety - Reporting of Shutdowns and Patterns of Violations.

On July 21, 2010, the Dodd-Frank Wall Street and Consumer Protection Act (the “Act”) was enacted. Section 1503 of the Act requires a Current Report on Form 8-K if a company is issued an imminent danger order under Section 107(a) of the Federal Mine Safety and Health Act of 1977 (the “Mine Act”) by the federal Mine Safety and Health Administration (“MSHA”).

On May 28, 2026, Sunrise Coal, LLC, a subsidiary of Hallador Energy Company, received an imminent danger order under Section 107(a) of the Mine Act at Oaktown Fuels, Mine No. 1 ("Oaktown"), located in Knox County, Indiana (MSHA ID# 12-02394). On that date, an MSHA representative alleged that the employee of an independent trucking company was observed climbing onto an elevated position on the side of a truck bed without wearing fall protection. The order required the employee of the independent contractor to immediately climb down from the truck. No injuries resulted from the condition; no employees of Sunrise Coal were affected and production at the mine was not interrupted. Sunrise Coal disputes the issuance of an imminent danger order to it, given that the alleged imminent danger condition was created solely by the acts or omissions of an independent contractor operating on the mine site and reserves the right to contest the order and any related citation or proposed assessment.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


		Hallador Energy Company



June 3, 2026	By:	/s/ERIC VAN DEMAN
		Eric Van Deman Chief Accounting Officer