Cytek Biosciences
CTKB
153 hedge funds and large institutions have $309M invested in Cytek Biosciences in 2025 Q3 according to their latest regulatory filings, with 20 funds opening new positions, 62 increasing their positions, 53 reducing their positions, and 24 closing their positions.
17% more repeat investments, than reductions
Existing positions increased: 62 | Existing positions reduced: 53
14% more capital invested
Capital invested by funds: $270M → $309M (+$38.6M)
0.2% more ownership
Funds ownership: 62.68% → 62.88% (+0.2%)
3% less funds holding
Funds holding: 158 → 153 (-5)
17% less first-time investments, than exits
New positions opened: 20 | Existing positions closed: 24
100% less call options, than puts
Call options by funds: $0 | Put options by funds: $2K
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
+$9.54M |
| 2 |
Millennium Management
New York
|
+$9.36M |
| 3 |
TCM
Topline Capital Management
Santa Monica,
California
|
+$6.43M |
| 4 |
Goldman Sachs
New York
|
+$2.71M |
| 5 |
RA
Royce & Associates
New York
|
+$1.4M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BCM
Brown Capital Management
Baltimore,
Maryland
|
-$8.08M |
| 2 |
New York State Common Retirement Fund
Albany,
New York
|
-$6.6M |
| 3 |
Vanguard Group
Malvern,
Pennsylvania
|
-$3.12M |
| 4 |
Citadel Advisors
Miami,
Florida
|
-$2.01M |
| 5 |
BlackRock
New York
|
-$1.83M |
CTKB Hedge Fund Activity: Q3 2025 in Review
153 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Cytek Biosciences (CTKB) for Q3 2025, worth a combined $309M — up 14% from $270M a quarter earlier.
Sellers outnumbered buyers: 24 funds closed out of CTKB and 20 opened new positions — a net loss of 4 holders — while 53 trimmed existing stakes and 62 added.
The largest buyer was Wellington Management Group, opening a new position worth an estimated $9.54M. The largest seller was Brown Capital Management, cutting an estimated $8.08M.
- 153 institutional investors held Cytek Biosciences (CTKB) as of Q3 2025, down from 158 in Q2 2025.
- Funds reported $309M of Cytek Biosciences stock for Q3 2025, up 14% quarter-over-quarter.
- 20 funds opened new Cytek Biosciences positions in Q3 2025 and 24 closed out, a net change of -4 holders.
- The largest Cytek Biosciences buyer in Q3 2025 was Wellington Management Group, an estimated $9.54M added.
- The largest Cytek Biosciences seller in Q3 2025 was Brown Capital Management, an estimated $8.08M sold.
Based on aggregated 13F filings for Q3 2025.