cnr-20260108
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): January 8, 2026
Core Natural Resources, Inc.
(Exact name of registrant as specified in its charter)
| Delaware | 001-38147 | 82-1954058 | ||||||||||||
| (State or other jurisdiction of incorporation) | (Commission File Number) | (IRS Employer Identification No.) | ||||||||||||
275 Technology Drive Suite 101
Canonsburg, Pennsylvania 15317
(Address of principal executive offices)
(Zip code)
Registrant's telephone number, including area code:
(724) 416-8300
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(s) | Name of each exchange on which registered | ||||||
| Common Stock, $0.01 par value | CNR | New York Stock Exchange | ||||||
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 January 8, 2026, Mingo Logan Coal LLC, a subsidiary of Core Natural Resources, Inc., received an imminent danger order under section 107(a) of the Federal Mine Safety and Health Act of 1977 at the Mountaineer II mine located in Logan County, West Virginia. The order states that an inspector found an accumulation of elevated methane levels in an isolated section of the mine. Mine personnel promptly took appropriate actions to alleviate the condition and restored acceptable methane levels. The Mine Safety and Health Administration has terminated the 107(a) order, and no injuries or illnesses resulted from the temporary condition.
SIGNATURES
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.
| Core Natural Resources, Inc. | ||||||||
| (Registrant) | ||||||||
| By: | /s/ MITESHKUMAR B. THAKKAR | |||||||
| Miteshkumar B. Thakkar | ||||||||
| Chief Financial Officer and President | ||||||||
Date: January 12, 2026