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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.

New
Increased
Maintained
Reduced
Closed

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

Holders
153
Holders Change
-5
Holders Change %
-3.16%
% of All Funds
2.01%
Holding in Top 10
1
Holding in Top 10 Change
+1
Holding in Top 10 Change %
% of All Funds
0.01%
New
20
Increased
62
Reduced
53
Closed
24
Calls
–
Puts
$2K
Net Calls
-$2K
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
Wellington Management Group
Wellington Management Group
Massachusetts
+$9.54M
2
Millennium Management
Millennium Management
New York
+$9.36M
3
TCM
Topline Capital Management
California
+$6.43M
4
Goldman Sachs
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
Maryland
-$8.08M
2
New York State Common Retirement Fund
New York State Common Retirement Fund
New York
-$6.6M
3
Vanguard Group
Vanguard Group
Pennsylvania
-$3.12M
4
Citadel Advisors
Citadel Advisors
Florida
-$2.01M
5
BlackRock
BlackRock
New York
-$1.83M
Name Holding Trade Value Shares
Change 		Change in
Stake
Cerity Partners
76
Cerity Partners
New York
$180K +$2.35K +627 +1%
LSERS
77
Louisiana State Employees Retirement System
Louisiana
$175K +$9.01K +2,400 +5%
Citigroup
78
Citigroup
New York
$173K -$224K -59,670 -54%
IIM
79
INTECH Investment Management
Florida
$168K +$5.84K +1,556 +3%
New York State Teachers Retirement System (NYSTRS)
80
New York State Teachers Retirement System (NYSTRS)
New York
$168K – – –
BHCM
81
Brevan Howard Capital Management
Jersey
$165K -$28.7K -7,642 -14%
Manulife (Manufacturers Life Insurance)
82
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$141K -$14K -3,728 -8%
Wealth Enhancement Advisory Services
83
Wealth Enhancement Advisory Services
Minnesota
$138K +$19.9K +5,308 +17%
OAM
84
Oxford Asset Management
United Kingdom
$130K +$93.2K +24,836 +196%
Boston Partners
85
Boston Partners
Massachusetts
$129K +$140K +37,183 New
DTL
86
Dynamic Technology Lab
Singapore
$122K -$39.8K -10,595 -23%
State Board of Administration of Florida Retirement System
87
State Board of Administration of Florida Retirement System
Florida
$120K – – –
QT
88
Quantbot Technologies
New York
$118K +$34.4K +9,176 +37%
AB
89
Amalgamated Bank
New York
$111K +$7.52K +2,003 +7%
AAP
90
Arax Advisory Partners
Colorado
$105K +$114K +30,259 New
PFSRSONJ
91
Police & Firemen's Retirement System of New Jersey
New Jersey
$102K – – –
B
92
Bailard
California
$102K +$110K +29,300 New
BIG
93
Brooklyn Investment Group
New York
$101K -$8.3K -2,212 -7%
COPPSERS
94
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$96.7K +$5.72K +1,524 +6%
YCM
95
Yousif Capital Management
Michigan
$95.7K -$13.6K -3,621 -12%
Mariner
96
Mariner
Kansas
$93.3K +$36.3K +9,663 +56%
Comerica Bank
97
Comerica Bank
Texas
$93K -$13.6K -3,621 -12%
SO
98
STRS Ohio
Ohio
$90.9K – – –
OPERF
99
Oregon Public Employees Retirement Fund
Oregon
$85.6K +$4.5K +1,200 +5%
TRSOTSOK
100
Teachers Retirement System of the State of Kentucky
Kentucky
$85K – – –
2 3
4
5 6

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.