John C Plant
CIK 1136562 · Executive Chairman & CEO · last filed 2026-05-12
John C Plant is an Executive Chairman & CEO who has filed 106 SEC Form 4 insider transactions across 5 companies since 2007. The most recent filing, for MAS, was dated May 12, 2026. Across all open-market trades the lifetime net is −$293.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $594.5M across reported positions. 43 SEC filings were submitted jointly with Arconic 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.
TRW 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
201 ISABELLA STREET
PITTSBURGH, PA 15212
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| MAS | Director | 50,574 | $75.51 | $3.82M | -$255.8K | 16 | 2026-05-12 |
| JBL | Director | 6,500 | $275.68 | $1.79M | -$8.63M | 11 | 2026-04-29 |
| HWM | Executive Chairman & CEO | 3,022,553 | $194.36 | $587.46M | -$119.59M | 39 | 2026-02-18 |
| GTES | Director | 57,493 | $25.48 | $1.46M | $0 | 2 | 2019-02-26 |
| ZF TRW AUTOMOTIVE HOLDINGS CORP (TRW) Delisted | Chairman, President & CEO | 0 | — | — | -$165.39M | 36 | 2015-05-15 |
Recent Filings
106 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-05-12 | MAS | Grant (A) | +2,650 | $0 | EDGAR |
| 2026-04-29 | JBL | Grant (A) | +600 | $0 | EDGAR |
| 2026-02-18 | HWM | Grant (A) | +22,333 | $0 | EDGAR |
| 2025-07-02 | HWM | Grant (A) | +255,363 | $0 | EDGAR |
| 2025-05-13 | MAS | Grant (A) | +2,900 | $0 | EDGAR |
| 2025-05-12 | HWM | Notice (144) | −800,000 | -$125.93M | EDGAR |
| 2025-05-12 | HWM | Sell (S) | −800,000 | -$125.57M | EDGAR |
| 2025-02-20 | HWM | Grant (A) | +41,268 | $0 | EDGAR |
| 2025-01-27 | JBL | Mixed | −48,700 | -$8.63M | EDGAR |
| 2025-01-24 | JBL | Notice (144) | −50,000 | -$8.63M | 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.