| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Houghton Kathleen | Sr. VP-Sales and Marketing, Director | C/O HUDSON TECHNOLOGIES, INC., 300 TICE BOULEVARD, SUITE 290, WOODCLIFF LAKE | /s/ Kathleen Houghton | 12 Jan 2026 | 0001824104 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | HDSN | Common Stock | Options Exercise | $90,000 | +120,000 | +292% | $0.7500 | 161,163 | 08 Jan 2026 | Direct | |
| transaction | HDSN | Common Stock | Tax liability | $318,598 | -44,873 | -28% | $7.10 | 116,290 | 08 Jan 2026 | Direct | |
| transaction | HDSN | Common Stock | Options Exercise | $76,190 | +47,619 | +41% | $1.60 | 163,909 | 08 Jan 2026 | Direct | |
| transaction | HDSN | Common Stock | Tax liability | $154,759 | -21,797 | -13% | $7.10 | 142,112 | 08 Jan 2026 | Direct | |
| transaction | HDSN | Common Stock | Options Exercise | $193,883 | +50,888 | +36% | $3.81 | 193,000 | 08 Jan 2026 | Direct | |
| transaction | HDSN | Common Stock | Tax liability | $244,112 | -34,382 | -18% | $7.10 | 158,618 | 08 Jan 2026 | Direct |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | HDSN | Stock Option | Options Exercise | $0 | -120,000 | -100% | $0.000000 | 0 | 08 Jan 2026 | Common Stock | 120,000 | $0.7500 | Direct | |
| transaction | HDSN | Stock Option | Options Exercise | $0 | -47,619 | -100% | $0.000000 | 0 | 08 Jan 2026 | Common Stock | 47,619 | $1.60 | Direct | |
| transaction | HDSN | Stock Option | Options Exercise | $0 | -50,888 | -100% | $0.000000 | 0 | 08 Jan 2026 | Common Stock | 50,888 | $3.81 | Direct |