| 07/02/2026 4:55 PM | Hartree Partners, LP (1597857) Filed by Hudson Technologies (925528) Subject | Form SCHEDULE 13G/A | |
| 07/02/2026 4:58 PM | Hartree Partners, LP (1597857) Reporting Hudson Technologies (925528) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 07/02/2026 5:00 PM | Hartree Partners, LP (1597857) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/22/2026 8:16 AM | Feeler Jeffrey R (1369458) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/22/2026 8:17 AM | Bulgarino Nicole E (1640972) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/22/2026 8:18 AM | Hudson Technologies (925528) Issuer Mansy Loan Nguyen (1948762) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/22/2026 8:19 AM | Hudson Technologies (925528) Issuer Parrillo Richard (1620726) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/22/2026 8:20 AM | Hudson Technologies (925528) Issuer Prouty Eric A (1620724) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/22/2026 8:21 AM | Hudson Technologies (925528) Issuer Sheriff Alan (1823076) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/12/2026 3:05 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 06/11/2026 8:16 AM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
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| 06/05/2026 3:15 PM | Hartree Partners, LP (1597857) Filed by Hudson Technologies (925528) Subject | Form SCHEDULE 13G | |
| 05/28/2026 3:15 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 05/21/2026 10:31 AM | Hudson Technologies (925528) Issuer Parrillo Richard (1620726) Reporting | Form 4/A | |
| 05/21/2026 8:02 AM | Bertaux Brian J. (2032778) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/20/2026 3:05 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 05/18/2026 7:35 AM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 05/15/2026 12:25 PM | Hudson Technologies (925528) Issuer Mansy Loan Nguyen (1948762) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/15/2026 12:21 PM | Hudson Technologies (925528) Issuer Parrillo Richard (1620726) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/15/2026 11:38 AM | Hudson Technologies (925528) Issuer Sheriff Alan (1823076) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/15/2026 11:39 AM | Hudson Technologies (925528) Issuer Prouty Eric A (1620724) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/15/2026 11:40 AM | Bulgarino Nicole E (1640972) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/15/2026 11:36 AM | Gaglione Kenneth (1824089) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/15/2026 11:36 AM | Feeler Jeffrey R (1369458) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/11/2026 3:05 PM | Hudson Technologies (925528) Filer | Form 10-Q General form for quarterly reports under Section 13 or 15(d) | |
| 05/06/2026 3:16 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 04/24/2026 8:24 AM | Hudson Technologies (925528) Filer | Form ARS | |
| 04/24/2026 8:15 AM | Hudson Technologies (925528) Filer | Form DEF 14A | |
| 04/24/2026 8:19 AM | Hudson Technologies (925528) Filer | Form DEFA14A | |
| 04/14/2026 10:59 AM | Feeler Jeffrey R (1369458) Reporting Hudson Technologies (925528) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 04/14/2026 10:59 AM | Feeler Jeffrey R (1369458) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/14/2026 11:00 AM | Hudson Technologies (925528) Issuer Sheriff Alan (1823076) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 04/14/2026 11:00 AM | Hudson Technologies (925528) Issuer Sheriff Alan (1823076) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/13/2026 8:00 AM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 04/09/2026 12:42 PM | DIMENSIONAL FUND ADVISORS LP (354204) Filed by Hudson Technologies (925528) Subject | Form SCHEDULE 13G | |
| 03/27/2026 8:53 AM | Hudson Technologies (925528) Subject VANGUARD GROUP INC (102909) Filed by | Form SCHEDULE 13G/A | |
| 03/18/2026 3:10 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 02/17/2026 3:44 PM | Hudson Technologies (925528) Subject WESTERLY CAPITAL MANAGEMENT, LLC (1546172) Filed by | Form SCHEDULE 13G/A | |
| 02/02/2026 10:20 AM | Hudson Technologies (925528) Issuer Stoody Robert (2107144) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 02/02/2026 8:01 AM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 01/30/2026 7:45 AM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
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| 01/12/2026 1:51 PM | Houghton Kathleen (1824104) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 01/07/2026 11:15 PM | Hudson Technologies (925528) Filer | Form EFFECT | |
| 12/17/2025 3:15 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 12/16/2025 3:05 PM | Hudson Technologies (925528) Filer | Form S-3 Registration statement under Securities Act of 1933 | |
| 12/15/2025 3:48 PM | COLEMAN BRIAN F (1250706) Reporting Hudson Technologies (925528) Issuer | Form 4/A | |
| 12/10/2025 3:43 PM | Hartree Partners, LP (1597857) Filed by Hudson Technologies (925528) Subject | Form SCHEDULE 13D | |
| 12/09/2025 3:05 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 12/09/2025 2:30 PM | COLEMAN BRIAN F (1250706) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 12/01/2025 8:00 AM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 11/25/2025 3:23 PM | Gaglione Kenneth (1824089) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 11/24/2025 8:19 AM | Gaglione Kenneth (1824089) Reporting Hudson Technologies (925528) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 11/18/2025 9:47 AM | ABBATECOLA VINCENT P (1250688) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 11/05/2025 3:16 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 11/03/2025 3:16 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 10/22/2025 4:20 PM | Hudson Technologies (925528) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 09/26/2025 9:15 AM | ABBATECOLA VINCENT P (1250688) Reporting Hudson Technologies (925528) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 08/01/2025 3:00 PM | Hudson Technologies (925528) Filer | Form 10-Q General form for quarterly reports under Section 13 or 15(d) | |
| 08/01/2025 8:42 AM | Hudson Technologies (925528) Issuer Prouty Eric A (1620724) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |