Core Natural Resources (CNR) SVP Klein sells 15,000 shares, keeps 53,679

Rhea-AI Filing Summary

Core Natural Resources, Inc. insider Rosemary L. Klein, SVP, CLO & Corporate Secretary, reported open-market sales of company common stock. On March 19, 2026, she sold 10,000 shares at $105.00 per share and an additional 5,000 shares at $110.62 per share, totaling 15,000 shares.

After these transactions, Klein directly holds 53,679 shares of common stock, of which 11,045 shares are unvested restricted stock units, indicating she retains a meaningful equity stake and ongoing equity-based compensation exposure to the company.

Insights

Equity compensation and insider-trading analyst

SVP executes moderate open-market stock sale while retaining sizable equity stake.

Senior executive Rosemary L. Klein executed two open-market sales on March 19, 2026, selling a total of 15,000 shares of Core Natural Resources common stock at prices of $105.00 and $110.62 per share.

Following these sales, she continues to directly hold 53,679 shares, including 11,045 unvested restricted stock units. This mix of outright shares and unvested awards shows ongoing alignment with shareholder outcomes despite the net-sell activity disclosed in this Form 4.

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
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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 PENNSYLVANIA 15317

(City) (State) (Zip)

UNITED STATES

(Country)

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.

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/19/2026

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

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

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

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	03/19/2026		S		10,000	D	$105	58,679	D
Common stock, par value $0.01 per share	03/19/2026		S		5,000	D	$110.62	53,679(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. Of the 53,679 shares, 11,045 shares represent unvested restricted stock units.

	/s/ Rosemary L. Klein	03/20/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Core Natural Resources (CNR) report for Rosemary L. Klein?

Core Natural Resources reported that SVP, CLO & Corporate Secretary Rosemary L. Klein sold a total of 15,000 shares of common stock in open-market transactions on March 19, 2026, while continuing to hold a significant remaining equity position in the company.

How many Core Natural Resources (CNR) shares did Rosemary L. Klein sell and at what prices?

Rosemary L. Klein sold 10,000 Core Natural Resources shares at $105.00 per share and an additional 5,000 shares at $110.62 per share, all on March 19, 2026, according to the Form 4 insider trading disclosure filed for these transactions.

How many Core Natural Resources (CNR) shares does Rosemary L. Klein hold after the reported sale?

After the reported transactions, Rosemary L. Klein directly holds 53,679 shares of Core Natural Resources common stock. This figure represents her remaining direct ownership position following the sale of 15,000 shares disclosed in the Form 4 filing.

What portion of Rosemary L. Klein’s Core Natural Resources (CNR) holdings are unvested restricted stock units?

Of Rosemary L. Klein’s 53,679 Core Natural Resources shares held after the sale, 11,045 shares are unvested restricted stock units. This indicates a substantial component of her equity exposure remains tied to future vesting and continued service or performance conditions.

Were the Core Natural Resources (CNR) insider transactions by Rosemary L. Klein open-market sales?

Yes. Both transactions reported for Rosemary L. Klein are coded as “S” and described as open-market or private sales. She sold 10,000 and 5,000 shares, respectively, at $105.00 and $110.62 per share on March 19, 2026, according to the Form 4 data.