Summary
Updated Aug 30, 2026
James A. Brock is Executive Chair and CEO of Core Natural Resources, Inc. (CNR). 5 SEC Form 4 filings on record going back to 2025, most recently on 25 March 2026. Most recent open-market trade: sold $4.12M of CNR on 19 March 2026. Lifetime open-market sales: $4.12M.
Recent Transactions
9Every recent SEC Form 4 transaction James A. Brock has reported, most recent first.
Trading Pattern
InsiderAlpha's records for James A. Brock go back to 2025: 5 primary Form 4 filings, an average of 2.5 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies James A. Brock files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Rosemary L. Klein - $1.60M of CNR open-market activity in the last 12 months
- Richard A. Navarre - $961K of CNR open-market activity in the last 12 months
- John Rothka - $866K of CNR open-market activity in the last 12 months
- Patrick A. Kriegshauser - $235K of CNR open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is James A. Brock?
James A. Brock is a corporate insider, tracked as Executive Chair and CEO of Core Natural Resources, Inc. (CNR). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did James A. Brock last file a Form 4?
The most recent primary Form 4 on record is dated 25 March 2026, one of 5 filings going back to 2025.
Has James A. Brock been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($4.12M) across all tracked filings.
Where can I see all of James A. Brock's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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