Joseph P Platt JR
CIK 1399967 · last filed 2026-08-07
Joseph P Platt JR 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 $6.6M across reported positions. 16 SEC filings were submitted jointly with CONSOL Energy Inc.
"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.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
CEIX price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
535 SMITHFIELD ST.
PITTSBURGH, PA 15222
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| GLRE | Director | 177,611 | $14.82 | $2.63M | -$1.35M | 28 | 2026-08-07 |
| CNR | Director | 40,660 | $90.35 | $3.67M | $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 | $35.91 | $343.3K | $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.