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Cytek Biosciences
CTKB

165 hedge funds and large institutions have $372M invested in Cytek Biosciences in 2026 Q1 according to their latest regulatory filings, with 24 funds opening new positions, 68 increasing their positions, 51 reducing their positions, and 11 closing their positions.

New
Increased
Maintained
Reduced
Closed

196% more call options, than puts

Call options by funds: $71K | Put options by funds: $24K

118% more first-time investments, than exits

New positions opened: 24 | Existing positions closed: 11

33% more repeat investments, than reductions

Existing positions increased: 68 | Existing positions reduced: 51

6% more funds holding

Funds holding: 155 → 165 (+10)

2.37% more ownership

Funds ownership: 64.15% → 66.53% (+2.4%)

0% more funds holding in top 10

Funds holding in top 10: 2 → 2 (0)

10% less capital invested

Capital invested by funds: $414M → $372M (-$42.5M)

Holders
165
Holders Change
+10
Holders Change %
+6.45%
% of All Funds
2.03%
Holding in Top 10
2
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.02%
New
24
Increased
68
Reduced
51
Closed
11
Calls
$71K
Puts
$24K
Net Calls
+$47K
Net Calls Change
+$37K

Top Buyers

1
Millennium Management
Millennium Management
New York
+$7.27M
2
Boston Partners
Boston Partners
Massachusetts
+$3.75M
3
CP
CenterBook Partners
Connecticut
+$3.45M
4
SC
Simcoe Capital
Washington
+$2.76M
5
Goldman Sachs
Goldman Sachs
New York
+$2.62M

Top Sellers

1
Wellington Management Group
Wellington Management Group
Massachusetts
-$3.86M
2
BCM
Brown Capital Management
Maryland
-$2.8M
3
TCM
Topline Capital Management
California
-$1.78M
4
Acadian Asset Management
Acadian Asset Management
Massachusetts
-$1.3M
5
UBS Group
UBS Group
Switzerland
-$1.29M
Name Holding Trade Value Shares
Change 		Change in
Stake
State Board of Administration of Florida Retirement System
76
State Board of Administration of Florida Retirement System
Florida
$152K – – –
SG Americas Securities
77
SG Americas Securities
New York
$151K -$140K -29,681 -46%
Focus Partners Wealth
78
Focus Partners Wealth
Massachusetts
$147K +$850 +180 +0.5%
Manulife (Manufacturers Life Insurance)
79
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$141K -$16.2K -3,433 -10%
AB
80
Amalgamated Bank
New York
$139K -$2.53K -535 -2%
PFSRSONJ
81
Police & Firemen's Retirement System of New Jersey
New Jersey
$129K – – –
Mercer Global Advisors
82
Mercer Global Advisors
Colorado
$127K +$34.9K +7,389 +34%
JF
83
Jump Financial
Illinois
$126K +$136K +28,892 New
COPPSERS
84
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$119K -$142 -30 -0.1%
YCM
85
Yousif Capital Management
Michigan
$118K +$2.21K +468 +2%
VF
86
Virtu Financial
New York
$118K +$128K +27,026 New
SO
87
STRS Ohio
Ohio
$114K – – –
IIM
88
INTECH Investment Management
Florida
$112K -$123K -26,111 -50%
Two Sigma Investments
89
Two Sigma Investments
New York
$112K -$20.9K -4,432 -15%
Squarepoint
90
Squarepoint
New York
$111K +$119K +25,296 New
OPERF
91
Oregon Public Employees Retirement Fund
Oregon
$110K – – –
Fifth Third Bancorp
92
Fifth Third Bancorp
Ohio
$109K +$113K +23,997 +2,631%
TRSOTSOK
93
Teachers Retirement System of the State of Kentucky
Kentucky
$107K – – –
Barclays
94
Barclays
United Kingdom
$106K -$751K -159,096 -87%
State of Tennessee, Department of Treasury
95
State of Tennessee, Department of Treasury
Tennessee
$100K – – –
CIAM
96
Caitong International Asset Management
Hong Kong
$90.9K +$73.9K +15,650 +304%
B
97
Bailard
California
$87K -$44.4K -9,400 -32%
AC
98
AXQ Capital
New Jersey
$86.1K +$2.76K +584 +3%
VPIM
99
Vanguard Personalized Indexing Management
California
$83.3K +$32.2K +6,821 +56%
ProShare Advisors
100
ProShare Advisors
Maryland
$79.6K -$21.3K -4,517 -20%
2 3
4
5 6

CTKB Hedge Fund Activity: Q1 2026 in Review

165 of the 8,125 institutional investors tracked by Wall St. Rank reported a position in Cytek Biosciences (CTKB) for Q1 2026, worth a combined $372M — down 10% from $414M a quarter earlier.

Buyers outnumbered sellers: 24 funds opened new CTKB positions and 11 closed out — a net gain of 13 holders — while 68 added to existing stakes and 51 trimmed.

The largest buyer was Millennium Management, adding an estimated $7.27M. The largest seller was Wellington Management Group, exiting entirely with an estimated $3.86M sold.

  • 165 institutional investors held Cytek Biosciences (CTKB) as of Q1 2026, up from 155 in Q4 2025.
  • Funds reported $372M of Cytek Biosciences stock for Q1 2026, down 10% quarter-over-quarter.
  • 24 funds opened new Cytek Biosciences positions in Q1 2026 and 11 closed out, a net change of +13 holders.
  • The largest Cytek Biosciences buyer in Q1 2026 was Millennium Management, an estimated $7.27M added.
  • The largest Cytek Biosciences seller in Q1 2026 was Wellington Management Group, an estimated $3.86M sold.

Based on aggregated 13F filings for Q1 2026.