HDSN · Insider Trading
Hudson Technologies Inc
Every open-market purchase and sale reported by HDSN officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-11-02 | Hartree Partners, LP | 10%+ Owner | Buy | +300,000 | +$1.31M |
| 2026-09-28 | Hartree Partners, LP | 10%+ Owner | Buy | +118,549 | +$604.45K |
| 2026-09-23 | Hartree Partners, LP | 10%+ Owner | Buy | +13,515 | +$68.92K |
| 2026-09-18 | Hartree Partners, LP | 10%+ Owner | Buy | +11,136 | +$56.79K |
| 2026-09-04 | Hartree Partners, LP | 10%+ Owner | Buy | +5,317 | +$27.12K |
| 2026-08-26 | Hartree Partners, LP | 10%+ Owner | Buy | +100,612 | +$553.05K |
| 2026-08-14 | Hartree Partners, LP | 10%+ Owner | Buy | +5,198 | +$28.59K |
| 2026-07-31 | Hartree Partners, LP | 10%+ Owner | Buy | +52,104 | +$312.10K |
| 2026-07-22 | Hartree Partners, LP | 10%+ Owner | Buy | +65,550 | +$392.60K |
| 2026-07-08 | Hartree Partners, LP | 10%+ Owner | Buy | +5,234 | +$31.35K |
| 2026-07-02 | Hartree Partners, LP | 10%+ Owner | Buy | +764,202 | +$4.48M |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Hartree Partners, LP | 10%+ Owner | 5,607,227 | $24.62M |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the HDSN quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.