| 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 | 26 Sep 2025 | 0001250688 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | HDSN | Common Stock | Options Exercise | $34,868 | +4,744 | +2.9% | $7.35 | 169,767 | 24 Sep 2025 | Direct | |
| transaction | HDSN | Common Stock | Tax liability | $34,873 | -3,519 | -2.1% | $9.91 | 166,248 | 24 Sep 2025 | Direct |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | HDSN | Stock Options | Options Exercise | $0 | -4,744 | -100% | $0.000000 | 0 | 24 Sep 2025 | Common Stock | 4,744 | $7.35 | Direct |