[Form 4] Core Natural Resources, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Core Natural Resources, Inc. (CNR) insider John Rothka, the company’s Chief Accounting Officer, reported two automatic sales under a Rule 10b5-1 plan. On 10/08/2025 he sold 1,000 shares at $95, and on 10/09/2025 he sold 1,000 shares at $100, reducing his direct holdings to 9,307 shares. The filing notes the trades were executed under a trading plan adopted on 03/24/2025. Of the remaining shares, 828 are unvested restricted stock units, which limits immediately tradable stock. The Form 4 was signed by an attorney-in-fact on 10/10/2025, and indicates routine, preauthorized sales rather than open-market discretionary trades.

Positive

• Sales executed under a Rule 10b5-1 plan, indicating preauthorization and reduced likelihood of opportunistic timing
• Form 4 explicitly discloses unvested restricted stock units (828), improving transparency about locked holdings

Negative

• Direct holdings decreased to 9,307 shares, a reduction from prior position after the two sales

Insights

Governance & Insider Trading Analyst

Insider completed preplanned sales under a 10b5-1 plan, modestly reducing holdings.

The Chief Accounting Officer sold a total of 2,000 shares in two automatic transactions at $95 and $100 on 10/08/2025 and 10/09/2025. The trades were executed under a Rule 10b5-1 plan adopted on 03/24/2025, which provides an affirmative defense for scheduled sales and signals preauthorization.

Key dependencies include the size of retained vested shares and remaining unvested RSUs (828). Monitor quarterly disclosures and subsequent Form 4s over the next 30-90 days for additional sales or grants that could change insider alignment with shareholders.

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).

X

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^*

Rothka John

(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)
	Chief Accounting Officer

3. Date of Earliest Transaction (Month/Day/Year)
10/08/2025

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

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	10/08/2025		S(1)		1,000	D	$95	10,307	D
Common stock, par value $0.01 per share	10/09/2025		S(1)		1,000	D	$100	9,307(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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2025 and represents an automatic sale.

2. Of the 9,307 shares reported, 828 are unvested restricted stock units.

	/s/ Rosemary L. Klein, Attorney-in-Fact for John Rothka	10/10/2025
	** 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 did CNR insider John Rothka sell and when?

He sold 1,000 shares on 10/08/2025 at $95 and 1,000 shares on 10/09/2025 at $100 under a preexisting plan.

Were the sales discretionary or preplanned for CNR (symbol: CNR)?

The sales were automatic under a Rule 10b5-1 trading plan adopted on 03/24/2025, not discretionary trades.

How many shares does John Rothka own after the reported trades?

He beneficially owns 9,307 shares following the reported transactions.

Does the filing disclose any unvested awards for the insider?

Yes; the filing states that 828 shares are unvested restricted stock units out of the 9,307 reported.

Who signed the Form 4 for John Rothka?

The Form 4 was signed by Rosemary L. Klein, Attorney-in-Fact, with a signature date of 10/10/2025.