| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| ABBATECOLA VINCENT P | Director | C/O HUDSON TECHNOLOGIES, INC., 300 TICE BOULEVARD, SUITE 290, WOODCLIFF LAKE | /s/ Vincent P. Abbatecola | 18 Nov 2025 | 0001250688 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | HDSN | Common Stock | Purchase | $23,748 | +3,500 | +2.1% | $6.78 | 169,748 | 17 Nov 2025 | Direct |