Insider · CIK 0001437827
William N Thorndike Jr
Files at CNX (CNX Resources Corp), PRM (Perimeter Solutions, SA). First filing Mar 6, 2026, latest May 6, 2026.
In brief
William N Thorndike Jr files SEC Form 4 as director at PRM (Perimeter Solutions, SA), and also at CNX (CNX Resources Corp). Since Mar 6, 2026, William N Thorndike Jr has reported 0 open-market buys worth $0 and 3 open-market sells worth $17M, the latest filed on May 6, 2026.
A track record needs three past buys with six months of prices behind them; William N Thorndike Jr has 0, so none is measured yet.
The newest scored trade: sold $1.1M of CNX on May 4, 2026, filed May 6, 2026, scored 25 (weak). In the last 12 months: 0 buys worth $0 and 3 sells worth $17M.
Where the trades landed
Last year at the 2 companies this insider has traded most, with each buy and sell on the bar it happened.
PRM: Perimeter Solutions, SA
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
CNX: CNX Resources Corp
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 25Weak | CNXsell CNX Resources Corp | $1.1M 28,800 shares | -6% | +36% from low-10% from high | |
| 40Moderate | PRMsell Perimeter Solutions, SA | $7.6M 325,000 shares | -4% | +164% from low-20% from high | |
| 40Moderate | PRMsell Perimeter Solutions, SA | $7.8M 325,000 shares | -4% | +168% from low-19% from high |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| May 4, 2026 | CNX CNX Resources Corp | 28,800 0.02% of outstanding | $1.1M | May 4, 2026 | none |
| Mar 12, 2026 | PRM Perimeter Solutions Inc | 115,000 0.08% of outstanding | $2.7M | Mar 12, 2026 | $15M |
| Mar 5, 2026 | PRM Perimeter Solutions Inc | 525,000 0.35% of outstanding | $13M | Mar 5, 2026 | $3.0M |
| Mar 4, 2026 | PRM Perimeter Solutions Inc | 125,000 0.08% of outstanding | $3.0M | Mar 4, 2026 | none |
Transactions
Every row this insider has filed, 17 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| May 7, 2026 | CNX CNX Resources Corp | AGrant or award Common shares, $0.01 par value per share | +8,770 | $0.00 | $0 | 435,355 | May 11, 2026 |
| May 4, 2026 | CNX CNX Resources Corp | MOption exercise Common shares, $0.01 par value per share | +83,097 | $13.19 | $1.1M | 455,385 | May 6, 2026 |
| May 4, 2026 | CNX CNX Resources Corp | SOpen-market sale Common shares, $0.01 par value per share | -28,800 | $38.25 | $1.1M | 426,585 | May 6, 2026 |
| May 4, 2026 | CNX CNX Resources Corp | MOption exercise Stock Option (right to buy)derivative | -83,097 | $0.00 | $0 | 0 | May 6, 2026 |
| Mar 9, 2026 | PRM Perimeter Solutions, SA | SOpen-market sale Common Stock | -90,043 | $23.18 | $2.1M | 8,770,613 | Mar 11, 2026 |
| Mar 9, 2026 | PRM Perimeter Solutions, SA | SOpen-market sale Common Stock | -34,957 | $23.85 | $834k | 8,735,656 | Mar 11, 2026 |
| Mar 10, 2026 | PRM Perimeter Solutions, SA | SOpen-market sale Common Stock | -100,000 | $23.63 | $2.4M | 8,635,656 | Mar 11, 2026 |
| Mar 11, 2026 | PRM Perimeter Solutions, SA | SOpen-market sale Common Stock | -100,000 | $23.18 | $2.3M | 8,535,656 | Mar 11, 2026 |
| Mar 4, 2026 | PRM Perimeter Solutions, SA | SOpen-market sale Common Stock | -125,000 | $24.26 | $3.0M | 9,060,656 | Mar 6, 2026 |
| Mar 5, 2026 | PRM Perimeter Solutions, SA | SOpen-market sale Common Stock | -100,000 | $24.06 | $2.4M | 8,960,656 | Mar 6, 2026 |
| Mar 6, 2026 | PRM Perimeter Solutions, SA | SOpen-market sale Common Stock | -100,000 | $23.63 | $2.4M | 8,860,656 | Mar 6, 2026 |
| Mar 3, 2026 | PRM Perimeter Solutions, SA | AGrant or award Common Stock | +5,582,492 | $0.00 | $0 | 9,185,656 | Mar 5, 2026 |
| Dec 9, 2025 | PRM Perimeter Solutions, SA | GGift Common Stock | -673,685 | $0.00 | $0 | 3,603,164 | Dec 11, 2025 |
| Jun 20, 2025 | PRM Perimeter Solutions, SA | JOther Common Stock | +746,767 | $0.00 | $0 | 4,276,849 | Jun 24, 2025 |
| Nov 6, 2024 | PRM Perimeter Solutions, SA | MOption exercise Ordinary Shares | +125,000 | $12.00 | $1.5M | 3,530,082 | Nov 8, 2024 |
| Nov 6, 2024 | PRM Perimeter Solutions, SA | MOption exercise Warrants (right to buy)derivative | -500,000 | $0.00 | $0 | 0 | Nov 8, 2024 |
| Mar 14, 2024 | PRM Perimeter Solutions, SA | JOther Ordinary Shares | +667,536 | $0.00 | $0 | 3,405,082 | Mar 18, 2024 |
Questions about William N Thorndike Jr
Answered from the filings on this page, as of the latest one.
Is William N Thorndike Jr buying or selling?
In the last 12 months William N Thorndike Jr reported 0 open-market buys worth $0 and 3 open-market sells worth $17M on SEC Form 4; the latest was sold $1.1M of CNX on May 4, 2026. Grants, option exercises and tax withholding are not counted.
How did William N Thorndike Jr's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and William N Thorndike Jr has 0.
Where does William N Thorndike Jr file Form 4?
William N Thorndike Jr has filed Form 4 at PRM (Perimeter Solutions, SA); CNX (CNX Resources Corp). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
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.