Rosemary L. Klein - 19 Mar 2026 Form 4 Insider Report for Core Natural Resources, Inc. (CNR)

Reporting relationship: SVP, CLO & Corp. Sec.
Issuer ticker: CNR
Reported as of: 19 Mar 2026
Net transaction value: -$1,603,100
SEC form: 4
Accepted by SEC: 20 Mar 2026, 10:27:21 UTC
Prior SEC filing: 23 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Rosemary L. Klein

Key filing fact

Rosemary L. Klein filed Form 4 for Core Natural Resources, Inc. (CNR) on 20 Mar 2026.

Key facts

This page summarizes Rosemary L. Klein's Form 4 filing for Core Natural Resources, Inc. (CNR).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 20 Mar 2026, 10:27.

Change

Previous filing in this sequence was filed on 23 Feb 2026.
Current net transaction value: -$1,603,100.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001310202 Primary reporting owner

Klein Rosemary L

Relationship: SVP, CLO & Corp. Sec.
Address: 275 TECHNOLOGY DRIVE, SUITE 101, CANONSBURG
Signature: /s/ Rosemary L. Klein
Signature date: 20 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CNR transaction

Common stock, par value $0.01 per share

Sale

Transaction value: $1,050,000
Shares: -10,000
Change %: -15%
Price: $105.00
Shares after: 58,679
Date: 19 Mar 2026
Ownership: Direct

CNR transaction

Common stock, par value $0.01 per share

Sale

Transaction value: $553,100
Shares: -5,000
Change %: -8.5%
Price: $110.62
Shares after: 53,679
Date: 19 Mar 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Of the 53,679 shares, 11,045 shares represent unvested restricted stock units.

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