Hudson Technologies
HDSN
168 hedge funds and large institutions have $226M invested in Hudson Technologies in 2025 Q4 according to their latest regulatory filings, with 26 funds opening new positions, 43 increasing their positions, 68 reducing their positions, and 25 closing their positions.
4,200% more call options, than puts
Call options by funds: $43K | Put options by funds: $1K
50% more funds holding in top 10
Funds holding in top 10: 2 → 3 (+1)
4% more first-time investments, than exits
New positions opened: 26 | Existing positions closed: 25
0.5% more ownership
Funds ownership: 76.18% → 76.69% (+0.5%)
1% less funds holding
Funds holding: 170 → 168 (-2)
31% less capital invested
Capital invested by funds: $330M → $226M (-$104M)
37% less repeat investments, than reductions
Existing positions increased: 43 | Existing positions reduced: 68
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
WCM
Westerly Capital Management
San Francisco,
California
|
+$5.2M |
| 2 |
Marshall Wace
London,
United Kingdom
|
+$2.68M |
| 3 |
SBH
Segall Bryant & Hamill
Chicago,
Illinois
|
+$1.42M |
| 4 |
Lazard Asset Management
New York
|
+$1.35M |
| 5 |
Credit Agricole
Montrouge Cedex,
France
|
+$1.1M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Royal Bank of Canada
Toronto,
Ontario, Canada
|
-$6.32M |
| 2 |
D.E. Shaw & Co
New York
|
-$1.88M |
| 3 |
Allspring Global Investments
Charlotte,
North Carolina
|
-$1.7M |
| 4 |
EF
Empowered Funds
Havertown,
Pennsylvania
|
-$1.58M |
| 5 |
Bank of America
Charlotte,
North Carolina
|
-$1.54M |
HDSN Hedge Fund Activity: Q4 2025 in Review
168 of the 8,267 institutional investors tracked by Wall St. Rank reported a position in Hudson Technologies (HDSN) for Q4 2025, worth a combined $226M — down 31% from $330M a quarter earlier.
Buyers outnumbered sellers: 26 funds opened new HDSN positions and 25 closed out — a net gain of 1 holder — while 43 added to existing stakes and 68 trimmed.
The largest buyer was Westerly Capital Management, adding an estimated $5.2M. The largest seller was Royal Bank of Canada, cutting an estimated $6.32M.
- 168 institutional investors held Hudson Technologies (HDSN) as of Q4 2025, down from 170 in Q3 2025.
- Funds reported $226M of Hudson Technologies stock for Q4 2025, down 31% quarter-over-quarter.
- 26 funds opened new Hudson Technologies positions in Q4 2025 and 25 closed out, a net change of +1 holder.
- The largest Hudson Technologies buyer in Q4 2025 was Westerly Capital Management, an estimated $5.2M added.
- The largest Hudson Technologies seller in Q4 2025 was Royal Bank of Canada, an estimated $6.32M sold.
Based on aggregated 13F filings for Q4 2025.