Other3

Core Natural Resources, Inc.

Total Value

$NaN

Filing Date

Aug 20, 2026

1 transactions

Trade Summary

On Aug 18, 2026, Tucker Nathan Joseph, SVP & Chief Financial Officer, reported $NaN of Core Natural Resources, Inc. (CNR) across 1 transactions. The filing covers company securities and reflects balanced net activity of $NaN. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Insider Information

Name: Tucker Nathan Joseph
Role: SVP & Chief Financial Officer
Location: CANONSBURG, PA

Filing Details

Filing Date: Aug 20, 2026
Transaction Date: Aug 18, 2026
Accession Number: 0001710366-26-000057
Form Type: 3

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Footnotes

(F1)Of the 1,590 shares reported, 690 are unvested restricted stock units that will vest in accordance with the terms of the applicable award agreement. Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Tucker Nathan Joseph

(Last)

(First)

(Middle)

275 TECHNOLOGY DRIVE

SUITE 101

(Street)

CANONSBURG

15317

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
08/18/2026

3. Issuer Name and Ticker or Trading Symbol
Core Natural Resources, Inc. [ CNR ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	SVP & Chief Financial Officer

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	1,590⁽¹⁾	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:

1. Of the 1,590 shares reported, 690 are unvested restricted stock units that will vest in accordance with the terms of the applicable award agreement. Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

Remarks:

	/s/ Rosemary L. Klein, Attorney-in-Fact for Nathan J. Tucker	08/20/2026
	** 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 5 (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 3 as rendered by the SEC from accession 0001710366-26-000057.

Core Natural Resources, Inc.

Trade Summary

Company Information

Insider Information

Filing Details

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Footnotes

SEC Form 3

SEC Filing

SEC Form 3