SEC Form 4
Core Natural Resources, Inc. (CNR) insider trading
In the 12 months to Oct 26, 2026, 4 CNR insiders reported open-market sales of $6.7M across 5 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $6.7M
- 5 filings · 4 insiders
- Open-market purchases
- $0
- 0 filings
Who traded CNR, and when
- Sale
CNR daily close from Oct 27, 2025 to Oct 26, 2026, between $76.01 and $113.23, last $88.47. 5 sale and 0 purchase filings by 4 insiders, marked at their filing dates. James A. Brock, Executive Chair and CEO: sold $4.1M across 1 filing, first filed Mar 19, 2026, last Mar 19, 2026. Rosemary L. Klein, SVP, CLO & Corp. Sec.: sold $1.6M across 1 filing, first filed Mar 20, 2026, last Mar 20, 2026. Richard A. Navarre, Director: sold $550.2K across 1 filing, first filed Mar 11, 2026, last Mar 11, 2026. John Rothka, Chief Accounting Officer: sold $445.8K across 2 filings, first filed Mar 11, 2026, last Mar 19, 2026.
Largest mark · tap a row for others
James A. Brock · Executive Chair and CEO
Sale $4,122,874
40,760 shares at $101.15 avg
Filed Mar 19, 2026 · traded Mar 18
Close on filing date $107.10
James A. Brock · Executive Chair and CEO
Executive Chair and CEO
$4.1M soldRosemary L. Klein · SVP, CLO & Corp. Sec.
SVP, CLO & Corp. Sec.
$1.6M soldRichard A. Navarre · Director
Director
$550.2K soldJohn Rothka · Chief Accounting Officer
Chief Accounting Officer
$445.8K soldOpen-market trades
5 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| James A. Brock | Executive Chair and CEO | $4.1M | — | 1 | — | |
| Rosemary L. Klein | SVP, CLO & Corp. Sec. | $1.6M | — | 1 | — | |
| Richard A. Navarre | Director | $550.2K | — | 1 | — | |
| John Rothka | Chief Accounting Officer | $445.8K | — | 2 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Rosemary L. Klein SVP, CLO & Corp. Sec. | Sale | 15,000 | $106.87 | $1.6M | 58,679 | |
traded | John Rothka Chief Accounting Officer | Sale | 1,000 | $97.66 | $97.7K | 5,190 | |
traded | James A. Brock Executive Chair and CEO | Sale | 40,760 | $101.15 | $4.1M | 100,000 | |
traded | Richard A. Navarre Director | Sale | 6,000 | $91.70 | $550.2K | 18,034 | |
traded | John Rothka Chief Accounting Officer | Sale | 3,800 | $91.62 | $348.2K | 6,190 |
GET /stocks/filings/vX/form-4?tickers=CNR&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"CNR"
],
"issuer_cik": "0001710366",
"owner_cik": "0001310202",
"accession_number": "0001193125-26-116954",
"form_type": "4",
"filing_date": "2026-03-20",
"period_of_report": "2026-03-19",
"issuer_name": "Core Natural Resources, Inc.",
"issuer_trading_symbol": "CNR",
"owner_name": "Klein Rosemary L",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "SVP, CLO & Corp. Sec.",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common stock, par value $0.01 per share",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-03-19",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 5000,
"transaction_price_per_share": 110.62,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 53679,
"transaction_value": 553100,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "Of the 53,679 shares, 11,045 shares represent unvested restricted stock units."
}
]
},
{
"tickers": [
"CNR"
],
"issuer_cik": "0001710366",
"owner_cik": "0001310202",
"accession_number": "0001193125-26-116954",
"form_type": "4",
"filing_date": "2026-03-20",
"period_of_report": "2026-03-19",
"issuer_name": "Core Natural Resources, Inc.",
"issuer_trading_symbol": "CNR",
"owner_name": "Klein Rosemary L",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "SVP, CLO & Corp. Sec.",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common stock, par value $0.01 per share",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-03-19",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 10000,
"transaction_price_per_share": 105,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 58679,
"transaction_value": 1050000,
"direct_or_indirect": "D"
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 33 records
- Tax withholding14 records
- Grants and awards15 records
- Gifts4 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has Core Natural Resources, Inc.'s CEO sold stock?
Yes. James A. Brock (CEO) sold 40,760 shares ($4.1M) in Mar 2026.
How current is CNR’s insider data?
These are CNR Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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Track CNR insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for CNR every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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