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Cytek Biosciences
CTKB

158 hedge funds and large institutions have $270M invested in Cytek Biosciences in 2025 Q2 according to their latest regulatory filings, with 25 funds opening new positions, 65 increasing their positions, 47 reducing their positions, and 27 closing their positions.

New
Increased
Maintained
Reduced
Closed

38% more repeat investments, than reductions

Existing positions increased: 65 | Existing positions reduced: 47

2.17% more ownership

Funds ownership: 60.51% → 62.68% (+2.2%)

7% less first-time investments, than exits

New positions opened: 25 | Existing positions closed: 27

1% less funds holding

Funds holding: 160 → 158 (-2)

13% less capital invested

Capital invested by funds: $311M → $270M (-$40.9M)

100% less call options, than puts

Call options by funds: $0 | Put options by funds: $2K

Holders
158
Holders Change
-2
Holders Change %
-1.25%
% of All Funds
2.08%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
25
Increased
65
Reduced
47
Closed
27
Calls
–
Puts
$2K
Net Calls
-$2K
Net Calls Change
+$18K

Top Buyers

Rank Fund Capital Flow
1
TCM
Topline Capital Management
California
+$12.5M
2
RA
Royce & Associates
New York
+$2.75M
3
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
+$2M
4
AQR Capital Management
AQR Capital Management
Connecticut
+$1.95M
5
Millennium Management
Millennium Management
New York
+$1.43M

Top Sellers

Rank Fund Capital Flow
1
Vanguard Group
Vanguard Group
Pennsylvania
-$6.19M
2
BlackRock
BlackRock
New York
-$3.44M
3
CP
CenterBook Partners
Connecticut
-$3.39M
4
Fidelity Investments
Fidelity Investments
Massachusetts
-$1.7M
5
TI
Trexquant Investment
Connecticut
-$1.68M
Name Holding Trade Value Shares
Change 		Change in
Stake
RIL
151
Rothschild Investment LLC
Illinois
$510 -$250 -75 -33%
HNB
152
Huntington National Bank
Ohio
$275 +$270 +81 New
PFBT
153
Parkside Financial Bank & Trust
Missouri
$225 +$220 +66 New
FMII
154
Farmers & Merchants Investments Inc
Nebraska
$204 – – –
LFG
155
Larson Financial Group
Missouri
$68 -$13 -4 -17%
Osaic Holdings
156
Osaic Holdings
Arizona
$68 – – –
CP
157
CenterBook Partners
Connecticut
– -$3.39M -845,405 Closed
AI
158
Acuitas Investments
Washington
– -$1.33M -331,219 Closed
GCM
159
Graham Capital Management
Connecticut
– -$330K -82,286 Closed
Allianz Asset Management
160
Allianz Asset Management
Germany
– -$297K -74,000 Closed
CF
161
Corebridge Financial
Texas
– -$247K -61,718 Closed
SGI
162
Summit Global Investments
Utah
– -$220K -54,873 Closed
JSL
163
JT Stratford LLC
Georgia
– -$147K -36,670 Closed
Verition Fund Management
164
Verition Fund Management
Connecticut
– -$134K -33,452 Closed
MSRPS
165
Maryland State Retirement & Pension System
Maryland
– -$126K -31,322 Closed
SPA
166
Sherbrooke Park Advisers
New York
– -$89.5K -22,314 Closed
Universal-Beteiligungs- und Servicegesellschaft
167
Universal-Beteiligungs- und Servicegesellschaft
Germany
– -$87.7K -21,873 Closed
QCM
168
Quantinno Capital Management
New York
– -$85K -21,190 Closed
EGM
169
Engineers Gate Manager
New York
– -$78.6K -19,607 Closed
Qube Research & Technologies (QRT)
170
Qube Research & Technologies (QRT)
United Kingdom
– -$78.5K -19,573 Closed
PCM
171
Prelude Capital Management
New York
– -$77K -19,200 Closed
Lazard Asset Management
172
Lazard Asset Management
New York
– -$75K -18,972 Closed
Point72 Asset Management
173
Point72 Asset Management
Connecticut
– -$70.2K -17,496 Closed
CC
174
Corton Capital
Ontario, Canada
– -$64.7K -16,129 Closed
Neuberger Berman Group
175
Neuberger Berman Group
New York
– -$56K -13,972 Closed
4 5 6
7
8

CTKB Hedge Fund Activity: Q2 2025 in Review

158 of the 7,595 institutional investors tracked by Wall St. Rank reported a position in Cytek Biosciences (CTKB) for Q2 2025, worth a combined $270M — down 13% from $311M a quarter earlier.

Sellers outnumbered buyers: 27 funds closed out of CTKB and 25 opened new positions — a net loss of 2 holders — while 47 trimmed existing stakes and 65 added.

The largest buyer was Topline Capital Management, adding an estimated $12.5M. The largest seller was Vanguard Group, cutting an estimated $6.19M.

  • 158 institutional investors held Cytek Biosciences (CTKB) as of Q2 2025, down from 160 in Q1 2025.
  • Funds reported $270M of Cytek Biosciences stock for Q2 2025, down 13% quarter-over-quarter.
  • 25 funds opened new Cytek Biosciences positions in Q2 2025 and 27 closed out, a net change of -2 holders.
  • The largest Cytek Biosciences buyer in Q2 2025 was Topline Capital Management, an estimated $12.5M added.
  • The largest Cytek Biosciences seller in Q2 2025 was Vanguard Group, an estimated $6.19M sold.

Based on aggregated 13F filings for Q2 2025.