Amended insider filing at Core Natural Resources (CNR) corrects share data

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

4/A

Rhea-AI Filing Summary

Core Natural Resources, Inc. filed an amended Form 4 for Executive Chair and CEO Brock James A to correct earlier clerical errors. The update clarifies that 2,960 shares of common stock were withheld on February 18, 2026 to cover the executive's tax liability. The amendment also states that the corrected amount of securities directly beneficially owned is 266,975 shares, of which 44,640 shares are unvested restricted stock units. These changes revise prior rounding and reporting mistakes rather than recording a new discretionary stock transaction.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Brock James A

Role Executive Chair and CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common stock, par value $0.01 per share	2,960	$88.96	$263K
holding	Common stock, par value $0.01 per share	--	--	--

Holdings After Transaction: Common stock, par value $0.01 per share — 271,415 shares (Direct)

Footnotes (1)

On February 19, 2026, the reporting person filed a Form 4 (the "Original Form 4") which inadvertently reported in the second row of Table I an incorrect amount of shares of common stock withheld to satisfy the reporting person's tax liability due to a clerical error. The corrected amount of securities withheld to satisfy the reporting person's tax liability was 2,960 shares. Due to immaterial clerical rounding errors, the reporting person's Original Form 4 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 266,975, of which 44,640 shares represent unvested restricted stock units.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 02/23/2026 - 04:11 PM

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^*

Brock James A

(Last)

(First)

(Middle)

275 TECHNOLOGY DRIVE, SUITE 101

(Street)

CANONSBURG

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
X	Officer (give title below)	Other (specify below)
	Executive Chair and CEO

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common stock, par value $0.01 per share	02/18/2026		F		2,960⁽¹⁾	D	$88.96	271,415	D
Common stock, par value $0.01 per share								266,975⁽²⁾	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. On February 19, 2026, the reporting person filed a Form 4 (the "Original Form 4") which inadvertently reported in the second row of Table I an incorrect amount of shares of common stock withheld to satisfy the reporting person's tax liability due to a clerical error. The corrected amount of securities withheld to satisfy the reporting person's tax liability was 2,960 shares.

2. Due to immaterial clerical rounding errors, the reporting person's Original Form 4 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 266,975, of which 44,640 shares represent unvested restricted stock units.

	/s/ Rosemary L. Klein, Attorney-in-Fact for James A. Brock	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.

Source: View Original Filing on SEC EDGAR

FAQ

What did Core Natural Resources (CNR) change in this amended Form 4?

The amended Form 4 corrects clerical errors in a prior filing. It updates the number of shares withheld for taxes and revises the total directly beneficially owned shares and unvested restricted stock units reported for the CEO.

How many Core Natural Resources (CNR) shares were withheld for the CEO’s taxes?

The filing states that 2,960 shares of common stock were withheld to satisfy the CEO’s tax liability. This corrects an incorrect amount previously reported due to a clerical error in the original Form 4.

What is Brock James A’s corrected beneficial ownership in CNR shares?

The corrected amount of securities directly beneficially owned is 266,975 shares. Within this total, 44,640 shares represent unvested restricted stock units, reflecting a restatement of previously misreported ownership figures.

Does this Core Natural Resources (CNR) Form 4/A show a new stock sale by the CEO?

The amendment focuses on correcting prior reporting errors, mainly tax-withholding and ownership totals. It describes shares withheld to cover tax liability rather than a new open-market purchase or sale by the CEO.

What was wrong with the original Core Natural Resources (CNR) Form 4?

The original Form 4 contained incorrect figures due to clerical and rounding errors. It misreported the number of shares withheld for taxes and showed inaccurate totals for directly owned shares and unvested restricted stock units.

How many unvested restricted stock units does the CNR CEO hold after correction?

After correction, the CEO is reported to hold 44,640 shares in the form of unvested restricted stock units. This figure replaces an earlier, incorrect RSU amount disclosed in the original insider filing.