Brock James A 4/A

What Happened
James A. Brock, Executive Chair and CEO (also a Director) of Core Natural Resources, had 2,960 shares of CNR common stock withheld to satisfy a tax liability related to an equity event. The withholding occurred on 2026-02-18 at $88.96 per share, totaling $263,322. This was a tax-withholding disposal (reported with transaction code F), not an open-market sale.

Key Details

• Transaction date: 2026-02-18; reported originally on Form 4 on 2026-02-19 and amended on 2026-02-23 to correct clerical errors.
• Shares withheld/disposed: 2,960 shares at $88.96 per share; total value $263,322.
• Shares beneficially owned after transaction (corrected): 266,975 shares, of which 44,640 are unvested restricted stock units (RSUs).
• Footnotes: The amended filing corrects an earlier clerical error that misreported the number of shares withheld for taxes and that misstated total beneficial ownership and unvested RSUs.
• Filing type: Amended Form 4 to correct reporting errors. No 10b5-1 plan or other sale plan is disclosed in the amendment.

Context
Tax-withholding dispositions are common after option exercises or RSU vesting and generally reflect routine tax obligations rather than a deliberate market-timed sale. The filing amendment corrects the record; the corrected ownership figures should be used when assessing the insider’s holdings.