| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Gaglione Kenneth | President and CEO, Director | C/O HUDSON TECHNOLOGIES, INC., 300 TICE BOULEVARD, SUITE 290, WOODCLIFF LAKE | /s/ Kenneth Gaglione | 24 Nov 2025 | 0001824089 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | HDSN | Common Stock | 37,504 | 24 Nov 2025 | Direct |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | HDSN | Stock Option | 24 Nov 2025 | Common Stock | 33,378 | $10.09 | Direct |