Core Natural Resources corrects insider share count

Core Natural Resources, Inc. filed an amended Form 4 for executive Rosemary L. Klein to correct previously misstated holdings caused by immaterial clerical rounding errors.

Rhea-AI Filing Summary

Core Natural Resources, Inc. filed an amended Form 4 for executive Rosemary L. Klein to correct previously misstated holdings caused by immaterial clerical rounding errors. The corrected beneficial ownership is 68,679 shares, of which 11,045 are unvested restricted stock units.

This amendment does not reflect new stock purchases or sales; it replaces inaccurate share and RSU amounts reported in an earlier Form 4 filed on February 19, 2026.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Klein Rosemary L

Role SVP, CLO & Corp. Sec.

Type	Security	Shares	Price	Value
holding	Common stock, par value $0.01 per share	--	--	--

Holdings After Transaction: Common stock, par value $0.01 per share — 68,679 shares (Direct)

Footnotes (1)

1. F1. 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 and mistakenly indicated an incorrect amount of unvested restricted stock units owned. The corrected amount of securities beneficially owned by the reporting person is 68,679, of which 11,045 shares represent unvested restricted stock units.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Core Natural Resources (CNR) disclose in this amended Form 4?

The amended Form 4 corrects Rosemary L. Klein’s reported holdings after clerical rounding errors. It states she beneficially owns 68,679 shares of Core Natural Resources, including 11,045 unvested restricted stock units previously reported incorrectly.

How many Core Natural Resources (CNR) shares does Rosemary Klein now report owning?

The filing reports Rosemary L. Klein beneficially owns 68,679 shares of Core Natural Resources common stock. This figure includes both vested shares and 11,045 shares represented by unvested restricted stock units that were previously misstated due to rounding errors.

How many unvested RSUs does the Core Natural Resources (CNR) insider hold?

According to the amendment, Rosemary L. Klein holds 11,045 unvested restricted stock units. These RSUs are part of her total beneficial ownership of 68,679 shares and were previously reported incorrectly on an earlier Form 4 due to immaterial clerical rounding mistakes.

Did Rosemary Klein buy or sell Core Natural Resources (CNR) shares in this Form 4/A?

The Form 4/A does not report new purchases or sales of shares. Instead, it corrects the total number of securities and unvested restricted stock units previously disclosed, attributing the change to immaterial clerical rounding errors in the earlier Form 4 filing.

Why did Core Natural Resources (CNR) file this amended Form 4 for Rosemary Klein?

The amendment was filed because an earlier Form 4 on February 19, 2026 contained immaterial clerical rounding errors. Those errors led to incorrect totals for directly beneficially owned shares and unvested restricted stock units, which are now corrected in this updated ownership report.

Does this Core Natural Resources (CNR) Form 4/A change insider ownership meaningfully?

The filing describes the errors as immaterial clerical rounding issues, but it still provides corrected figures. It clarifies that Rosemary L. Klein beneficially owns 68,679 shares, including 11,045 unvested RSUs, replacing the inaccurate amounts shown in the prior Form 4.

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Accepted by SEC EDGAR 02/23/2026 - 04:18 PM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Klein Rosemary L

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, CLO & Corp. Sec.

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								68,679(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 and mistakenly indicated an incorrect amount of unvested restricted stock units owned. The corrected amount of securities beneficially owned by the reporting person is 68,679, of which 11,045 shares represent unvested restricted stock units.

	/s/ Rosemary L. Klein	02/23/2026
	** 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.