William N Thorndike Jr sold $7.6M of PRM
director at Perimeter Solutions, SA. 325,000 shares at an average of $23.39, traded Mar 9, 2026, filed Mar 11, 2026.
Score components
- +15RoleDirector
- +25Trade size$7.6M at market
- 0Share of holdings soldSold 3.7% of holdings
- 0ClusterNo other insider selling within 14 days
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
This signal so far: 1m +9.4%, 3m +45.2%, 6m +34.1%.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001437827-26-000007, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Mar 9, 2026 | SOpen-market sale Common Stock | -90,043 | $23.18 | $2.1M | 8,770,613 | Mar 11, 2026 |
| Mar 9, 2026 | SOpen-market sale Common Stock | -34,957 | $23.85 | $834k | 8,735,656 | Mar 11, 2026 |
| Mar 10, 2026 | SOpen-market sale Common Stock | -100,000 | $23.63 | $2.4M | 8,635,656 | Mar 11, 2026 |
| Mar 11, 2026 | SOpen-market sale Common Stock | -100,000 | $23.18 | $2.3M | 8,535,656 | Mar 11, 2026 |
Related signals
Other insiders at Perimeter Solutions, SA and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 47Moderate | PRMsell Perimeter Solutions, SA | Windacre Partnership LLC owner | $196M 5,705,979 shares | -26% | |
| 47Moderate | PRMsell Perimeter Solutions, SA | Windacre Partnership LLC owner | $196M 5,705,979 shares | -26% | |
| 70Notable | Perimeter Solutions, SA | Khouri Haitham Chief Executive Officer | $7.3M 229,535 shares | -11% | |
| 65Notable | Perimeter Solutions, SA | Jeffrey Emery President - Global Fire Safety | $1.8M 53,537 shares | -100% | |
| 67Notable | Perimeter Solutions, SA | Kyle Sable Chief Financial Officer | $1.6M 49,540 shares | -100% | |
| 65Notable | Perimeter Solutions, SA | Jeffrey Emery President - Global Fire Safety | $4.8M 146,463 shares | -315% | |
| 67Notable | Perimeter Solutions, SA | Kyle Sable Chief Financial Officer | $6.4M 200,460 shares | -134% | |
| 40Moderate | PRMsell Perimeter Solutions, SA | William N Thorndike Jr director | $7.8M 325,000 shares | -4% | |
| 53Moderate | Perimeter Solutions, SA | Noriko Yokozuka General Counsel | $3.9M 137,500 shares | -74% | |
| 60Notable | Perimeter Solutions, SA | Kyle Sable Chief Financial Officer | $2.8M 100,000 shares | -100% |
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.