Core Natural Resources director corrects share holdings

Core Natural Resources, Inc. director Joseph P. Platt Jr. filed an amended insider report to correct a previously misstated share balance.

Rhea-AI Filing Summary

Core Natural Resources, Inc. director Joseph P. Platt Jr. filed an amended insider report to correct a previously misstated share balance. The amendment explains that an earlier Form 4 contained immaterial clerical rounding errors in the total number of common shares directly beneficially owned.

The corrected figure shows that Platt directly owns 40,660 shares of common stock, par value $0.01 per share. The filing does not reflect a new purchase or sale of shares, but instead updates the reported ownership amount to the accurate total.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Platt Joseph P JR

Role Director

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 — 40,660 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. The corrected amount of securities beneficially owned by the reporting person is 40,660.

FAQ

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

What does Core Natural Resources (CNR) director Joseph P. Platt Jr.’s amended Form 4/A report?

The amended Form 4/A corrects a prior clerical rounding error in reported holdings. It now states Joseph P. Platt Jr. directly beneficially owns 40,660 shares of Core Natural Resources common stock, rather than the previously misstated total in the earlier filing.

Did Joseph P. Platt Jr. buy or sell Core Natural Resources (CNR) shares in this Form 4/A?

No, this Form 4/A does not report a new purchase or sale. It only corrects the previously reported total number of common shares directly beneficially owned, updating the figure to 40,660 shares due to earlier immaterial clerical rounding errors.

Why was Core Natural Resources (CNR) insider ownership corrected to 40,660 shares?

The ownership was corrected because a prior Form 4 included immaterial clerical rounding errors. The amendment clarifies that Joseph P. Platt Jr. directly beneficially owns 40,660 shares of common stock, ensuring the company’s insider ownership records accurately match his true holdings.

Who is the reporting person in Core Natural Resources (CNR) Form 4/A and what is their role?

The reporting person is Joseph P. Platt Jr., who serves as a director of Core Natural Resources, Inc. The amended Form 4/A updates his directly beneficially owned common stock position to 40,660 shares following correction of minor rounding errors in the prior filing.

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

The correction involves common stock of Core Natural Resources, Inc., with a par value of $0.01 per share. The amended filing states that director Joseph P. Platt Jr. directly beneficially owns a total of 40,660 shares of this common stock.

Does the Core Natural Resources (CNR) Form 4/A indicate any change in insider transaction direction?

The Form 4/A does not indicate a buy or sell transaction. It classifies the entry as a holding with an unknown transaction code, serving solely to correct the total number of shares directly beneficially owned, now shown as 40,660.

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Accepted by SEC EDGAR 02/24/2026 - 05:22 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^*

Platt Joseph P JR

(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								40,660(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 40,660.

	/s/ Rosemary L. Klein, Attorney-in-Fact for Joseph P. Platt, Jr.	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.