Hudson Technologies, Inc. (HDSN) Insider Trading
Over the last 3 months, HDSN insiders made 11 open-market buys and 0 sales, a net purchase of $209K (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 97 institutions increased and 128 reduced their position (13F).
Insider Activity
Sentiment
100/100
Buys (3m)
11
Sells (3m)
0
Net (3m)
$209.4K
Insiders buyingCluster buying
Insider trades by month Buys Sells
Dec
Jun
Nov
Nov
Dec
May
Context3-month price -2.4%Institutions reducing (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 22, 2026 | Sheriff Alandirector | Grant | 3,219 | — |
| Jun 22, 2026 | Bulgarino Nicole Edirector | Grant | 31,780 | $5.63 |
| Jun 22, 2026 | Parrillo Richarddirector | Grant | 31,780 | $5.63 |
| Jun 22, 2026 | Prouty Eric Adirector | Grant | 21,186 | $5.63 |
| Jun 22, 2026 | Feeler Jeffrey Rdirector | Grant | 15,360 | $5.63 |
| Jun 22, 2026 | Mansy Loan Nguyendirector | Grant | 8,881 | — |
| Jun 22, 2026 | Feeler Jeffrey Rdirector | Grant | 3,219 | — |
| Jun 22, 2026 | Sheriff Alandirector | Grant | 15,360 | $5.63 |
| Jun 22, 2026 | Prouty Eric Adirector | Grant | 4,440 | — |
| Jun 22, 2026 | Mansy Loan Nguyendirector | Grant | 21,186 | $5.63 |
| May 21, 2026 | Parrillo Richarddirector | Buy | 10,000 | $4.83 |
| May 21, 2026 | Bertaux Brian J.officer: Chief Financial Officer | Buy | 2,000 | $4.87 |
| May 15, 2026 | Prouty Eric Adirector | Buy | 5,000 | $4.84 |
| May 15, 2026 | Mansy Loan Nguyendirector | Buy | 3,600 | $4.96 |
| May 15, 2026 | Bulgarino Nicole Edirector | Buy | 550 | $4.84 |
| May 15, 2026 | Parrillo Richarddirector | Buy | 3,600 | $4.96 |
| May 15, 2026 | Sheriff Alandirector | Buy | 5,200 | $4.88 |
| May 15, 2026 | Feeler Jeffrey Rdirector | Buy | 5,100 | $4.92 |
| May 15, 2026 | Gaglione Kennethdirector, officer: President and CEO | Buy | 5,000 | $4.89 |
| May 15, 2026 | Mansy Loan Nguyendirector | Buy | 1,400 | $4.97 |
| May 15, 2026 | Parrillo Richarddirector | Buy | 1,400 | $4.97 |
| Apr 14, 2026 | Feeler Jeffrey Rdirector | Grant | 4,065 | — |
| Apr 14, 2026 | Sheriff Alandirector | Grant | 4,065 | — |
| Jan 12, 2026 | Houghton Kathleendirector, officer: Sr. VP-Sales and Marketing | Tax | 44,873 | $7.10 |
| Jan 12, 2026 | Houghton Kathleendirector, officer: Sr. VP-Sales and Marketing | Option | 47,619 | $1.60 |
| Jan 12, 2026 | Houghton Kathleendirector, officer: Sr. VP-Sales and Marketing | Tax | 21,797 | $7.10 |
| Jan 12, 2026 | Houghton Kathleendirector, officer: Sr. VP-Sales and Marketing | Tax | 34,382 | $7.10 |
| Jan 12, 2026 | Houghton Kathleendirector, officer: Sr. VP-Sales and Marketing | Option | 50,888 | $3.81 |
| Jan 12, 2026 | Houghton Kathleendirector, officer: Sr. VP-Sales and Marketing | Option | 120,000 | $0.75 |
| Dec 15, 2025 | COLEMAN BRIAN Fother: Former Director | Sell | 484,616 | $7.40 |
Source: HDSN SEC Form 4 filings, latest Jun 22, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their HDSN positions over the last 6 months (SEC Form 13F).
Increased
97
New positions
49
Reduced
128
Sold out
56
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| HARTREE PARTNERS, LP | Unchanged | 3.8M | Feb 17, 2026 |
| HARTREE PARTNERS, LP | Unchanged | 3.8M | May 12, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 3.3M | May 15, 2026 |
| WESTERLY CAPITAL MANAGEMENT, LLC | Increased | 3.2M | May 15, 2026 |
| BLACKROCK, INC. | Increased | 2.9M | Feb 12, 2026 |
| BLACKROCK, INC. | Reduced | 2.9M | May 13, 2026 |
| WESTERLY CAPITAL MANAGEMENT, LLC | Increased | 2.5M | Feb 17, 2026 |
| VANGUARD GROUP INC | Reduced | 2.3M | Jan 29, 2026 |
| DIMENSIONAL FUND ADVISORS LP | Increased | 2.1M | May 7, 2026 |
| DIMENSIONAL FUND ADVISORS LP | Increased | 2.0M | Feb 12, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 1.7M | Feb 12, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 1.5M | May 14, 2026 |
| AMERICAN CENTURY COMPANIES INC | Increased | 1.5M | May 15, 2026 |
| AMERICAN CENTURY COMPANIES INC | Increased | 1.4M | Feb 13, 2026 |
| NEW SOUTH CAPITAL MANAGEMENT INC | Reduced | 1.3M | Feb 12, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.