Hudson Technologies Inc
HDSN- Exchange
- Nasdaq
- Industry
- Wholesale-Machinery, Equipment & Supplies
- SEC CIK
- 0000925528
In the last 90 days, Hudson Technologies Inc insiders filed 9 open-market purchases and 0 sales; 151 institutions reported holding it in 13F filings for Q2 2026, worth $181.4M in total; no superinvestor holds it.
Holders of 5% or more of HDSN
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Hudson Technologies Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Hartree Partners, LP | 13G/A | 11.80%4.97M shares | +2.80 ppfrom 9.00% | Mar 12, 20255 filings | Jul 2, 2026 | SEC |
| Westerly Capital Management, LLC | 13G/A | 5.90% | −0.10 ppfrom 6.00% | Jun 24, 20252 filings | Feb 17, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
24 Schedule 13D and 13G filings on Hudson Technologies Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jul 14, 20261:27 PM ET | Dimensional Fund Advisors LP | 13G/A | 4.70%1.97M shares | −0.40 ppfrom 5.10%Below 5% | Jun 30, 2026 | SEC |
| Jul 2, 20265:55 PM ET | Hartree Partners, LP | 13G/A | 11.80%4.97M shares | +2.80 ppfrom 9.00% | Jun 30, 2026 | SEC |
| Jun 5, 20264:15 PM ET | Hartree Partners, LP | 13G | 9.00%3.80M shares | +0.30 ppfrom 8.70% | Jun 5, 2026 | SEC |
| Apr 9, 20261:42 PM ET | Dimensional Fund Advisors LP | 13G | 5.10%2.15M shares | New | Mar 31, 2026 | SEC |
| Mar 27, 20269:53 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Feb 17, 20264:44 PM ET | Westerly Capital Management, LLC | 13G/A | 5.90% | −0.10 ppfrom 6.00% | Dec 31, 2025 | SEC |
| Dec 10, 20254:43 PM ET | Hartree Partners, LP | 13D | 8.70%3.80M shares | −0.40 ppfrom 9.10% | Dec 8, 2025 | SEC |
| Jun 24, 20252:17 PM ET | Westerly Capital Management, LLC | 13G | 6.00%2.60M shares | New | Jun 16, 2025 | SEC |
| May 14, 20257:47 PM ET | Hartree Partners, LP | 13G/A | 9.10%4.00M shares | +2.30 ppfrom 6.80% | Mar 31, 2025 | SEC |
| Mar 12, 20255:18 PM ET | Hartree Partners, LP | 13G | 6.80%3.00M shares | New | Mar 5, 2025 | SEC |
| Mar 22, 2022 | Goldberg Capital Management | 13GOld format | – | New | – | SEC |
| Feb 14, 2022 | Cooper Creek Partners Management LLC | 13GOld format | – | – | – | SEC |
| Feb 14, 2022 | ArrowMark Colorado Holdings LLC | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2022 | Calm Waters Partnership | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2022 | Zugibe Maura | 13G/AOld format | – | – | – | SEC |
| Feb 7, 2022 | Riva Ridge Capital Management LP | 13G/AOld format | – | – | – | SEC |
| Jul 1, 2021 | Calm Waters Partnership | 13GOld format | – | – | – | SEC |
| May 25, 2021 | Coleman Brian F | 13DOld format | – | New | – | SEC |
| May 24, 2021 | Riva Ridge Capital Management LP | 13GOld format | – | New | – | SEC |
| May 4, 2021 | Zugibe Maura | 13GOld format | – | New | – | SEC |
| May 4, 2021 | Zugibe Kevin J | 13D/AOld format | – | – | – | SEC |
| Feb 16, 2021 | ArrowMark Colorado Holdings LLC | 13G/AOld format | – | – | – | SEC |
| Feb 12, 2021 | Cooper Creek Partners Management LLC | 13GOld format | – | New | – | SEC |
| Feb 8, 2021 | Calm Waters Partnership | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Hudson Technologies Inc shares.
No Form 144 notices for Hudson Technologies Inc are on file.