Time on boards
- Boards served
- 2
- Current seats
- 2
- Board service
- 7 years
- Director since
- 2023
7 years of board service in total across 2 boards, counting each seat separately. Longest: Core Natural Resources Inc., 3 years.
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
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Greenlight Capital Re Ltd. July 28, 202696.1%
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Core Natural Resources Inc. April 30, 202699.3%
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Greenlight Capital Re Ltd. August 4, 202594.0%
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Core Natural Resources Inc. April 29, 202599.4%
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Core Natural Resources Inc. April 30, 202499.2%
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Core Natural Resources Inc. April 27, 202377.1%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Aug 7, 2026 | Greenlight Capital Re Ltd. | Grant or award | +7,992 | — | — |
| May 26, 2026 | Greenlight Capital Re Ltd. | Open-market sale | −11,747 | $16.87 | $198,172 |
| May 19, 2026 | Greenlight Capital Re Ltd. | Open-market sale | −23,613 | $18.01 | $425,270 |
| May 14, 2026 | Greenlight Capital Re Ltd. | Open-market sale | −12,000 | $17.50 | $210,000 |
| May 13, 2026 | Greenlight Capital Re Ltd. | Open-market sale | −820 | $17.50 | $14,350 |
| May 12, 2026 | Greenlight Capital Re Ltd. | Open-market sale | −6,820 | $17.50 | $119,350 |
| Feb 17, 2026 | Core Natural Resources Inc. | Grant or award | +1,610 | — | — |
| Nov 18, 2025 | Greenlight Capital Re Ltd. | Open-market purchase | +5,000 | $12.97 | $64,850 |
| Aug 7, 2025 | Greenlight Capital Re Ltd. | Grant or award | +8,046 | — | — |
| Feb 18, 2025 | Core Natural Resources Inc. | Grant or award | +1,674 | — | — |
| Feb 18, 2025 | Core Natural Resources Inc. | Grant or award | +1,674 | — | — |
| Aug 9, 2024 | Greenlight Capital Re Ltd. | Grant or award | +8,393 | — | — |
| May 7, 2024 | Core Natural Resources Inc. | Grant or award | +1,733 | — | — |
| Sep 15, 2023 | Core Natural Resources Inc. | Open-market sale | −10,227 | $98.33 | $1,005,621 |
| Aug 7, 2023 | Greenlight Capital Re Ltd. | Grant or award | +9,342 | — | — |
Questions about Joseph P. Platt Jr.
What boards is Joseph P. Platt Jr. on?
Joseph P. Platt Jr. sits on the boards of Core Natural Resources Inc. and Greenlight Capital Re Ltd.
How long has Joseph P. Platt Jr. served on boards?
Our records show at least 7 years of board service across 2 boards, the earliest from 2023.
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