James A. Brock - 18 Mar 2026 Form 4 Insider Report for Core Natural Resources, Inc. (CNR)

Reporting relationship: Executive Chair and CEO, Director
Issuer ticker: CNR
Reported as of: 18 Mar 2026
Net transaction value: -$4,122,874
SEC form: 4
Accepted by SEC: 19 Mar 2026, 17:42:17 UTC
Prior SEC filing: 23 Feb 2026
Next SEC filing: 25 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Rosemary L. Klein, Attorney-in-Fact for James A. Brock

Key filing fact

James A. Brock filed Form 4 for Core Natural Resources, Inc. (CNR) on 19 Mar 2026.

Key facts

This page summarizes James A. Brock's Form 4 filing for Core Natural Resources, Inc. (CNR).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 19 Mar 2026, 17:42.

Change

Previous filing in this sequence was filed on 23 Feb 2026.
Current net transaction value: -$4,122,874.

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 0001620612 Primary reporting owner

Brock James A

Relationship: Executive Chair and CEO, Director
Address: 275 TECHNOLOGY DRIVE, SUITE 101, CANONSBURG
Signature: /s/ Rosemary L. Klein, Attorney-in-Fact for James A. Brock
Signature date: 19 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: $4,122,874
Shares: -40,760
Change %: -29%
Price: $101.15
Shares after: 100,000
Date: 18 Mar 2026
Ownership: By SLAT-1
Footnotes: F1, F2

CNR holding

Common stock, par value $0.01 per share

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 24,440
Date: 18 Mar 2026
Ownership: Lee Ann Brock Trust

CNR holding

Common stock, par value $0.01 per share

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 117,398
Date: 18 Mar 2026
Ownership: By GRAT-1

CNR holding

Common stock, par value $0.01 per share

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 266,975
Date: 18 Mar 2026
Ownership: Direct
Footnotes: F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

This sale was made in connection with a long-term strategy for estate planning purposes.

Footnote F2

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $100.62 to $101.57, inclusive. The reporting person undertakes to provide to Core Natural Resources, Inc., any security holder of Core Natural Resources, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4.

Footnote F3

Of the 266,975 shares reported, 44,640 shares are unvested restricted stock units.