Clerical error corrected in Core Natural Resources (CNR) Form 4/A

Rhea-AI Filing Summary

Core Natural Resources, Inc. director Holly K. Koeppel filed an amended Form 4 to correct her reported direct ownership of common stock. A prior Form 4 contained immaterial clerical rounding errors, and the corrected total number of shares directly beneficially owned is now reported as 14,970.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

KOEPPEL HOLLY K

(Last) (First) (Middle)

275 TECHNOLOGY DRIVE, SUITE 101

(Street)

CANONSBURG PA 15317

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Core Natural Resources, Inc. [ CNR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
02/17/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)
02/19/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common stock, par value $0.01 per share								14,970(1)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. On February 19, 2026, due to immaterial clerical rounding errors, the reporting person filed a Form 4 which inadvertently reported an incorrect total amount of securities directly beneficially owned by the reporting person. The corrected amount of securities beneficially owned by the reporting person is 14,970.

	/s/ Rosemary L. Klein, Attorney-in-Fact for Holly K. Koeppel	02/24/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What does Core Natural Resources (CNR) Form 4/A report for Holly K. Koeppel?

The Form 4/A reports an amended disclosure for director Holly K. Koeppel. It corrects the previously reported total of directly beneficially owned Core Natural Resources common shares to 14,970 following identification of clerical rounding errors in an earlier Form 4 filing.

How many Core Natural Resources (CNR) shares does Holly K. Koeppel now report owning?

Holly K. Koeppel now reports directly beneficially owning 14,970 shares of Core Natural Resources common stock. This figure replaces an earlier, incorrectly rounded amount disclosed in a prior Form 4, according to the explanatory footnote in the amended filing.

Why did Core Natural Resources (CNR) file this amended Form 4/A?

The amended Form 4/A was filed because a prior Form 4 contained immaterial clerical rounding errors. The amendment corrects the total number of Core Natural Resources common shares directly beneficially owned by Holly K. Koeppel to 14,970, aligning reported ownership with accurate records.

Does the Core Natural Resources (CNR) Form 4/A show new buy or sell transactions?

The Form 4/A centers on a correction to reported holdings rather than detailing new buy or sell activity. It describes immaterial clerical rounding errors in an earlier Form 4 and updates Holly K. Koeppel’s directly beneficially owned share total to 14,970 common shares.

What type of security is reported in the Core Natural Resources (CNR) Form 4/A?

The Form 4/A reports holdings of Core Natural Resources common stock with a par value of $0.01 per share. It updates the number of these common shares directly beneficially owned by director Holly K. Koeppel to 14,970 after correcting prior rounding inaccuracies.