Hudson Technologies Inc
Ownership
Ownership Structure
Who owns Hudson Technologies Inc (HDSN)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 78.0% of the shares are freely tradable; institutional investors hold 81.3%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Hartree Partners, LP | 10.48 | 4,411,889 | +16.1 | 06/30/2026 |
| Westerly Capital Management LLC | 8.03 | 3,380,000 | +6.5 | 06/30/2026 |
| BlackRock Inc | 6.75 | 2,840,272 | -0.8 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 4.68 | 1,967,914 | -8.4 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.93 | 1,654,259 | -0.4 | 06/30/2026 |
| Renaissance Technologies Corp | 3.43 | 1,442,115 | -4.1 | 06/30/2026 |
| American Century Companies Inc | 2.78 | 1,169,462 | -21.4 | 06/30/2026 |
| Geode Capital Management, LLC | 2.36 | 995,011 | +4.9 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.83 | 1,189,633 | +0.0 | 09/30/2026 |
| iShares Russell 2000 ETF | 2.31 | 971,057 | -1.1 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Hartree Partners, LP | 10% Owner | 5,348,517 | 22,463,771 $ | Sep 24, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 24, 2026 | Hartree Partners, LP | 10% Owner | Buy | 118,549 | 5.10 | 604,446 |
| Sep 23, 2026 | Hartree Partners, LP | 10% Owner | Buy | 11,013 | 5.10 | 56,166 |
| Sep 21, 2026 | Hartree Partners, LP | 10% Owner | Buy | 2,502 | 5.10 | 12,757 |
| Sep 16, 2026 | Hartree Partners, LP | 10% Owner | Buy | 11,136 | 5.10 | 56,794 |
| Sep 2, 2026 | Hartree Partners, LP | 10% Owner | Buy | 5,317 | 5.10 | 27,117 |
| Aug 25, 2026 | Hartree Partners, LP | 10% Owner | Buy | 91,166 | 5.50 | 501,094 |
| Aug 24, 2026 | Hartree Partners, LP | 10% Owner | Buy | 9,446 | 5.50 | 51,953 |
| Aug 12, 2026 | Hartree Partners, LP | 10% Owner | Buy | 5,198 | 5.50 | 28,589 |
| Jul 29, 2026 | Hartree Partners, LP | 10% Owner | Buy | 52,104 | 5.99 | 312,103 |
| Jul 21, 2026 | Hartree Partners, LP | 10% Owner | Buy | 47,708 | 5.99 | 285,742 |
| Jul 20, 2026 | Hartree Partners, LP | 10% Owner | Buy | 17,842 | 5.99 | 106,859 |
| Jul 7, 2026 | Hartree Partners, LP | 10% Owner | Buy | 600 | 5.99 | 3,594 |
| Jul 6, 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: November 2, 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.