Joseph P JR Platt
CIK 1399967 · last filed 2026-08-07
Joseph P JR Platt is a corporate insider who has filed 46 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing, for GLRE, was dated Aug 7, 2026. Across all open-market trades the lifetime net is −$3.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $7.2M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$7.19M
4
46
-$3.09M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| GLRE | Director | 177,611 | $15.26 | $2.71M | -$1.35M | 28 | 2026-08-07 |
| CNR | Director | 40,660 | $101.24 | $4.12M | $0 | 3 | 2026-02-24 |
| Core Natural Resources, Inc. (CEIX) Delisted | Director | 35,690 | $99.61 | $3.56M | -$1.74M | 11 | 2024-05-09 |
| CNX | Director | 9,561 | $37.56 | $359.1K | $0 | 2 | 2017-05-11 |
Recent Filings
46 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-08-07 | GLRE | Grant (A) | +7,992 | $0 | EDGAR |
| 2026-08-07 | GLRE | Grant (A) | +7,992 | $0 | EDGAR |
| 2026-05-27 | GLRE | Sell (S) | −11,747 | -$198.2K | EDGAR |
| 2026-05-20 | GLRE | Sell (S) | −23,613 | -$425.3K | EDGAR |
| 2026-05-18 | GLRE | Sell (S) | −12,000 | -$210.0K | EDGAR |
| 2026-05-14 | GLRE | Sell (S) | −7,640 | -$133.7K | EDGAR |
| 2026-05-11 | GLRE | Notice (144) | −55,000 | -$988.9K | EDGAR |
| 2026-02-24 | CNR | — | — | $0 | EDGAR |
| 2026-02-19 | CNR | Grant (A) | +1,610 | $0 | EDGAR |
| 2025-11-19 | GLRE | Buy (P) | +5,000 | $64.9K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.