CNR SEC Form 4 filings
Core Natural Resources, Inc. Latest Insider Trading Activity
Over the past 2,372 days, 11 insider trades from Core Natural Resources, Inc. (CNR). The most recent SEC Form 4 filing shows 2 sales by Klein Rosemary L (Core Natural Resources, Inc. SVP, CLO & Corp. Sec) totaling 15,000 shares at a weighted-average price of $106.87 per share, with the latest transaction dated March 19, 2026. This page shows up to the 10 most recent SEC Form 4 filing records on a 6-hour delay. Sign up for real-time updates and access to 20 years of historic insider trading data.
Insider Trading For CNR Charted on Daily Candles. Scroll left or zoom out to load earlier candles (up to 2 years).
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| Ticker | Filing Date | Transaction Date | Company | Insider | Title | Transaction | Trade Count | Shares | Avg. Price | Total Value | Position Size Change | SEC Filing |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CNR | 2026-03-20 | 2026-03-19 | Core Natural Resources, Inc. | Klein Rosemary L | SVP, CLO & Corp. Sec | Sell | 2 | 15,000 | $106.87 | $1,603,100.00 | 11.78% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CNR | 2026-03-19 | 2026-03-18 | Core Natural Resources, Inc. | Brock James A | Executive Chair and CEO | Sell | 1 | 40,760 | $101.15 | $4,122,874.00 | 28.96% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CNR | 2026-03-19 | 2026-03-17 | Core Natural Resources, Inc. | Rothka John | Chief Accounting Officer | Sell | 1 | 1,000 | $97.66 | $97,660.00 | 16.16% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting CNR | 2025-09-26 | 2025-09-25 | Core Natural Resources, Inc. | Navarre Richard A | Director | Sell | 1 | 5,000 | $82.20 | $411,000.00 | 18.64% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting CNR | 2025-09-18 | 2025-09-17 | Core Natural Resources, Inc. | Kriegshauser Patrick A | Director | Sell | 1 | 3,043 | $77.07 | $234,524.01 | 11.53% | View Filing |
| Explained M/S: sale activity tied to share conversions or derivative-related share movements. CNR | 2021-11-29 | 2021-11-24 | Cornerstone Building Brands, Inc. | Buckley John L | Pres., Siding Division | Sell | 1 | 98,920 | $17.32 | $1,713,294.40 | 48.15% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CNR | 2021-08-18 | 2021-08-16 | Cornerstone Building Brands, Inc. | Holland John J | Director | Buy | 1 | 5,000 | $16.50 | $82,500.00 | 6.90% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CNR | 2020-05-18 | 2020-05-15 | Cornerstone Building Brands, Inc. | Metcalf James S | Chairman and CEO | Buy | 1 | 100,000 | $4.42 | $442,000.00 | 12.49% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CNR | 2020-05-14 | 2020-05-14 | Cornerstone Building Brands, Inc. | Ball George L. | Director | Buy | 1 | 60,000 | $3.75 | $225,000.00 | 17.51% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CNR | 2020-03-20 | 2020-03-19 | Cornerstone Building Brands, Inc. | Metcalf James S | Chairman and CEO | Buy | 1 | 100,000 | $3.79 | $379,000.00 | 14.27% | View Filing |
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