Insider · CIK 0001399967
Joseph P Platt JR
Files at GLRE (GREENLIGHT CAPITAL RE, LTD.), CNR (Core Natural Resources, Inc.). First filing Nov 19, 2025, latest May 27, 2026.
Joseph P Platt JR files SEC Form 4 as director at GLRE (GREENLIGHT CAPITAL RE, LTD.), and also at CNR (Core Natural Resources, Inc.). Since Nov 19, 2025, Joseph P Platt JR has reported 1 open-market buy worth $65k and 4 open-market sells worth $967k, the latest filed on May 27, 2026.
A track record needs three past buys with six months of prices behind them; Joseph P Platt JR has 0, so none is measured yet.
The newest scored trade: sold $198k of GLRE on May 26, 2026, filed May 27, 2026, scored 55 (moderate). In the last 12 months: 1 buy worth $65k and 4 sells worth $967k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
GLRE: GREENLIGHT CAPITAL RE, LTD.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 55Moderate | GREENLIGHT CAPITAL RE, LTD. | $198k 11,747 shares | -100% | +40% from low-12% from high | |
| 60Notable | GREENLIGHT CAPITAL RE, LTD. | $425k 23,613 shares | -67% | +50% from low-5% from high | |
| 45Moderate | GREENLIGHT CAPITAL RE, LTD. | $210k 12,000 shares | -25% | +45% from low-9% from high | |
| 39Weak | GREENLIGHT CAPITAL RE, LTD. | $134k 7,640 shares | -14% | +46% from low-8% from high | |
| 56Moderate | GREENLIGHT CAPITAL RE, LTD. | $65k 5,000 shares | - | +9% from low-14% from high |
Transactions
Every row this insider has filed, 10 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| May 26, 2026 | GLRE GREENLIGHT CAPITAL RE, LTD. | SOpen-market sale ORDINARY SHARESindirect: See footnote | -11,747 | $16.87 | $198k | 0 | May 27, 2026 |
| May 19, 2026 | GLRE GREENLIGHT CAPITAL RE, LTD. | SOpen-market sale ORDINARY SHARESindirect: See footnote | -23,613 | $18.01 | $425k | 11,747 | May 20, 2026 |
| May 14, 2026 | GLRE GREENLIGHT CAPITAL RE, LTD. | SOpen-market sale ORDINARY SHARESindirect: See footnote | -12,000 | $17.50 | $210k | 35,360 | May 18, 2026 |
| May 12, 2026 | GLRE GREENLIGHT CAPITAL RE, LTD. | SOpen-market sale ORDINARY SHARESindirect: See footnote | -6,820 | $17.50 | $119k | 48,180 | May 14, 2026 |
| May 13, 2026 | GLRE GREENLIGHT CAPITAL RE, LTD. | SOpen-market sale ORDINARY SHARESindirect: See footnote | -820 | $17.50 | $14k | 47,360 | May 14, 2026 |
| Feb 17, 2026 | CNR Core Natural Resources, Inc. | AGrant or award Common stock, par value $0.01 per share | +1,610 | $0.00 | $0 | 40,648 | Feb 19, 2026 |
| Nov 18, 2025 | GLRE GREENLIGHT CAPITAL RE, LTD. | POpen-market purchase ORDINARY SHARESindirect: Held by The Mary Jane & Joseph P Platt Jr. Family Foundation Inc. | +5,000 | $12.97 | $65k | 5,000 | Nov 19, 2025 |
| Aug 7, 2025 | GLRE GREENLIGHT CAPITAL RE, LTD. | AGrant or award ORDINARY SHARES | +8,046 | - | - | 169,619 | Aug 8, 2025 |
| Feb 18, 2025 | CNR Core Natural Resources, Inc. | AGrant or award Common stock, par value $0.01 per share | +1,674 | $0.00 | $0 | 37,364 | Feb 20, 2025 |
| Feb 18, 2025 | CNR Core Natural Resources, Inc. | AGrant or award Common stock, par value $0.01 per share | +1,674 | $0.00 | $0 | 39,038 | Feb 20, 2025 |
Questions about Joseph P Platt JR
Answered from the filings on this page, as of the latest one.
Is Joseph P Platt JR buying or selling?
In the last 12 months Joseph P Platt JR reported 1 open-market buy worth $65k and 4 open-market sells worth $967k on SEC Form 4; the latest was sold $198k of GLRE on May 26, 2026. Grants, option exercises and tax withholding are not counted.
How did Joseph P Platt JR's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Joseph P Platt JR has 0.
Where does Joseph P Platt JR file Form 4?
Joseph P Platt JR has filed Form 4 at GLRE (GREENLIGHT CAPITAL RE, LTD.); CNR (Core Natural Resources, Inc.). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.