Hudson Technologies Inc (HDSN)
Who owns Hudson Technologies Inc (HDSN)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 78.5% of the shares are freely tradable; institutional investors hold 81.3%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Hartree Partners, LP | 9.03 | 3,800,000 | +0.0 | 03/31/2026 |
| Westerly Capital Management LLC | 7.55 | 3,175,000 | +24.5 | 03/31/2026 |
| BlackRock Inc | 6.80 | 2,862,539 | -1.8 | 03/31/2026 |
| Vanguard Group Inc | 5.56 | 2,338,710 | -1.5 | 12/31/2025 |
| Dimensional Fund Advisors, Inc. | 5.11 | 2,148,311 | +5.1 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.95 | 1,660,146 | +0.0 | 03/31/2026 |
| Renaissance Technologies Corp | 3.58 | 1,504,250 | -11.4 | 03/31/2026 |
| American Century Companies Inc | 3.54 | 1,487,774 | +7.3 | 03/31/2026 |
| Newsouth Capital Management Inc | 2.95 | 1,241,223 | -3.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Total Stock Mkt Idx Inv | 2.83 | 1,189,633 | +0.0 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 29. Jul 2026 | Hartree Partners, LP | 10% Owner | Buy | 52,104 | 5.99 | 312,103 |
| 21. Jul 2026 | Hartree Partners, LP | 10% Owner | Buy | 47,708 | 5.99 | 285,742 |
| 20. Jul 2026 | Hartree Partners, LP | 10% Owner | Buy | 17,842 | 5.99 | 106,859 |
| 7. Jul 2026 | Hartree Partners, LP | 10% Owner | Buy | 600 | 5.99 | 3,594 |
| 6. Jul 2026 | Hartree Partners, LP | 10% Owner | Buy | 4,634 | 5.99 | 27,758 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.