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): April 3029, 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 51.~~07 Submission~~04 ofMine ~~Matters~~Safety to– aReporting ~~Vote~~ of ~~Security~~Shutdowns ~~Holders~~and Patterns of Violations.

On April 3029, 2026, Mingo Logan Coal LLC, a subsidiary of Core Natural Resources, Inc., received an imminent danger order under section 107(a) of the ~~“Company”)~~Federal ~~held~~Mine ~~its~~Safety ~~Annual~~and ~~Meeting~~Health Act of ~~Stockholders~~1977 (at the ~~“Annual~~Mountaineer ~~Meeting”)~~II mine located in Logan County, West Virginia. AsThe order states that an inspector found an accumulation of elevated methane levels at an air intake entry while equipment was energized in the ~~record~~mining ~~date~~section. ~~for~~Methane levels between the ~~Annual~~intake ~~Meeting,~~entry ~~March~~and 6,the ~~2026,~~stopping ~~there~~line at certain crosscuts were 50in excess of 5.0%,~~750,366~~ ~~shares~~and methane levels varied in the center of ~~common~~the ~~stock~~intake ~~outstanding~~entry ~~and~~from ~~entitled~~1.0% to ~~vote~~2.2%. Mine personnel promptly took appropriate actions to alleviate the condition and to restore acceptable methane levels. The ~~final~~Mine ~~voting~~Safety ~~results~~and Health Administration terminated the 107(a) order on the ~~matters~~same ~~considered~~day, byand ~~stockholders~~no atinjuries ~~the~~or ~~Annual~~illnesses ~~Meeting~~resulted ~~are~~from ~~provided~~the ~~below~~temporary condition.

Proposal 1: James A. Brock, Edward L. Doheny II, Ronald C. Keating, Holly Keller Koeppel, Patrick A. Kriegshauser, Richard A. Navarre, Valli Perera and Joseph P. Platt were elected as directors, each for a one-year term expiring at the Company’s 2027 Annual Meeting of Stockholders by the following votes:

Director Name	For	Withheld	BrokerNon-Votes
James A. Brock	40,602,812	260,727	4,305,336
Edward L. Doheny II	40,809,468	54,071	4,305,336
Ronald C. Keating	40,790,400	73,139	4,305,336
Holly Keller Koeppel	40,267,709	595,830	4,305,336
Patrick A. Kriegshauser	40,697,340	166,199	4,305,336
Richard A. Navarre	40,115,992	747,547	4,305,336
Valli Perera	40,468,236	395,303	4,305,336
Joseph P. Platt	40,582,356	281,183	4,305,336

Proposal 2: The appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026 was ratified, by the following votes:

For:			45,061,288
Against:			75,451
Abstain:			32,136

Proposal 3: The compensation paid to the Company’s named executive officers in 2025 was approved on an advisory basis, by the following votes:

For:			40,057,737
Against:			753,466
Abstain:			52,336
Broker Non-Votes:			4,305,336

Item 7.01 Regulation FD Disclosure.

A copy of the Company’s press release announcing the election of Messrs. Doheny and Keating is attached as Exhibit 99.1 to this Current Report on Form 8-K.

The information set forth in this Item 7.01, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section. The information set forth in this Item 7.01, including Exhibit 99.1, shall not be deemed incorporated by reference into any other filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit 99.1 Press release of Core Natural Resources, Inc. dated April 30, 2026

Exhibit 104 Cover Page Interactive Date File (embedded within the Inline XBRL document)

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
						President and Chief Financial Officer

Dated: ~~April~~May 304, 2026

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