Cytosorbents Corp
CTSO
49 hedge funds and large institutions have $16.9M invested in Cytosorbents Corp in 2025 Q1 according to their latest regulatory filings, with 7 funds opening new positions, 18 increasing their positions, 9 reducing their positions, and 9 closing their positions.
100% more repeat investments, than reductions
Existing positions increased: 18 | Existing positions reduced: 9
20% more capital invested
Capital invested by funds: $14.1M → $16.9M (+$2.81M)
14% more call options, than puts
Call options by funds: $8K | Put options by funds: $7K
2.93% more ownership
Funds ownership: 27.96% → 30.89% (+2.9%)
4% less funds holding
Funds holding: 51 → 49 (-2)
22% less first-time investments, than exits
New positions opened: 7 | Existing positions closed: 9
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AC
Avenir Corporation
Alexandria,
Virginia
|
+$2.06M |
| 2 |
CM
CM Management
Gulf Breeze,
Florida
|
+$268K |
| 3 |
SC
Skylands Capital
Milwaukee,
Wisconsin
|
+$233K |
| 4 |
Geode Capital Management
Boston,
Massachusetts
|
+$147K |
| 5 |
Renaissance Technologies
New York
|
+$145K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
GIM
Granahan Investment Management
Waltham,
Massachusetts
|
-$892K |
| 2 |
SIG
Sargent Investment Group
Bethesda,
Maryland
|
-$448K |
| 3 |
EGM
Engineers Gate Manager
New York
|
-$48K |
| 4 |
CCC
Cable Car Capital
San Francisco,
California
|
-$45.5K |
| 5 |
UBS Group
Zurich,
Switzerland
|
-$31.3K |
CTSO Hedge Fund Activity: Q1 2025 in Review
49 of the 7,457 institutional investors tracked by Wall St. Rank reported a position in Cytosorbents Corp (CTSO) for Q1 2025, worth a combined $16.9M — up 20% from $14.1M a quarter earlier.
Sellers outnumbered buyers: 9 funds closed out of CTSO and 7 opened new positions — a net loss of 2 holders — while 9 trimmed existing stakes and 18 added.
The largest buyer was Avenir Corporation, adding an estimated $2.06M. The largest seller was Granahan Investment Management, cutting an estimated $892K.
- 49 institutional investors held Cytosorbents Corp (CTSO) as of Q1 2025, down from 51 in Q4 2024.
- Funds reported $16.9M of Cytosorbents Corp stock for Q1 2025, up 20% quarter-over-quarter.
- 7 funds opened new Cytosorbents Corp positions in Q1 2025 and 9 closed out, a net change of -2 holders.
- The largest Cytosorbents Corp buyer in Q1 2025 was Avenir Corporation, an estimated $2.06M added.
- The largest Cytosorbents Corp seller in Q1 2025 was Granahan Investment Management, an estimated $892K sold.
Based on aggregated 13F filings for Q1 2025.