HDSN Hudson Technologies Inc.
Hudson Technologies Inc. (HDSN) Insider Activity
What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.
Where they traded
Last open-market purchase: September 16, 2026 , by Hartree Partners, LP .
Recent open-market activity
| Date | Insider | Role | Action | Shares | Price | Value | Held after |
|---|---|---|---|---|---|---|---|
| Hartree Partners, LP | 10% Owner | Buy | 11,136 | $5.10 | $56.8K | 5,216,453 | |
| Hartree Partners, LP | 10% Owner | Buy | 5,317 | $5.10 | $27.1K | 5,205,317 | |
| Hartree Partners, LP | 10% Owner | Buy | 91,166 | $5.50 | $501.1K | 5,200,000 | |
| Hartree Partners, LP | 10% Owner | Buy | 9,446 | $5.50 | $52.0K | 5,108,834 | |
| Hartree Partners, LP | 10% Owner | Buy | 5,198 | $5.50 | $28.6K | 5,099,388 | |
| Hartree Partners, LP | 10% Owner | Buy | 52,104 | $5.99 | $312.1K | 5,094,190 | |
| Hartree Partners, LP | 10% Owner | Buy | 47,708 | $5.99 | $285.7K | 5,042,086 | |
| Hartree Partners, LP | 10% Owner | Buy | 17,842 | $5.99 | $106.9K | 4,994,378 | |
| Hartree Partners, LP | 10% Owner | Buy | 600 | $5.99 | $3.6K | 4,976,536 | |
| Hartree Partners, LP | 10% Owner | Buy | 4,634 | $5.99 | $27.8K | 4,975,936 | |
| Hartree Partners, LP | 10% Owner | Buy | 271,302 | $5.97 | $1.6M | 4,971,302 | |
| Hartree Partners, LP | 10% Owner | Buy | 288,111 | $5.88 | $1.7M | 4,700,000 | |
| Hartree Partners, LP | 10% Owner | Buy | 204,789 | $5.68 | $1.2M | 4,411,889 |
Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.