Rosemary L. Klein - 17 Feb 2026 Form 4/A - Amendment Insider Report for Core Natural Resources, Inc. (CNR)

Role: SVP, CLO & Corp. Sec.
Signature: /s/ Rosemary L. Klein
Issuer symbol: CNR
Transactions as of: 17 Feb 2026
Net transactions value: $0
Form type: 4/A - Amendment
Filing time: 23 Feb 2026, 16:18:41 UTC
Date Of Original Report: 19 Feb 2026
Previous filing: 20 Feb 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Klein Rosemary L	SVP, CLO & Corp. Sec.	275 TECHNOLOGY DRIVE, SUITE 101, CANONSBURG	/s/ Rosemary L. Klein	23 Feb 2026	0001310202

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	CNR	Common stock, par value $0.01 per share						68,679	17 Feb 2026	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
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 and mistakenly indicated an incorrect amount of unvested restricted stock units owned. The corrected amount of securities beneficially owned by the reporting person is 68,679, of which 11,045 shares represent unvested restricted stock units.

Content

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 and mistakenly indicated an incorrect amount of unvested restricted stock units owned. The corrected amount of securities beneficially owned by the reporting person is 68,679, of which 11,045 shares represent unvested restricted stock units.