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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
BlackRock
1
BlackRock
New York
$74.3M -$783K -165,759 -1%
TCM
2
Topline Capital Management
California
$30.9M -$1.78M -377,985 -5%
HA
3
HHLR Advisors
Cayman Islands
$29.1M – – –
Millennium Management
4
Millennium Management
New York
$27.5M +$7.27M +1,539,351 +32%
Boston Partners
5
Boston Partners
Massachusetts
$25.4M +$3.75M +794,464 +16%
VCM
6
Vanguard Capital Management
Pennsylvania
$20.8M +$22.5M +4,762,904 New
State Street
7
State Street
Massachusetts
$18M -$110K -23,216 -0.6%
Geode Capital Management
8
Geode Capital Management
Massachusetts
$12.4M +$205K +43,381 +2%
Dimensional Fund Advisors
9
Dimensional Fund Advisors
Texas
$11.6M +$77.6K +16,438 +0.6%
Goldman Sachs
10
Goldman Sachs
New York
$10.2M +$2.62M +554,821 +31%
VPM
11
Vanguard Portfolio Management
Pennsylvania
$10.1M +$10.9M +2,311,858 New
Morgan Stanley
12
Morgan Stanley
New York
$7.51M +$84.5K +17,890 +1%
RA
13
Royce & Associates
New York
$7.18M -$237K -50,289 -3%
BCM
14
Brown Capital Management
Maryland
$6.47M -$2.8M -592,409 -29%
Russell Investments Group
15
Russell Investments Group
United Kingdom
$5.94M +$1.69M +358,773 +36%
Charles Schwab
16
Charles Schwab
California
$4.83M +$47.5K +10,062 +0.9%
Bank of America
17
Bank of America
North Carolina
$4.41M +$722K +152,893 +18%
Northern Trust
18
Northern Trust
Illinois
$4.39M +$225K +47,599 +5%
AQR Capital Management
19
AQR Capital Management
Connecticut
$3.99M +$797K +168,887 +23%
SC
20
Simcoe Capital
Washington
$3.85M +$2.76M +583,652 +196%
CP
21
CenterBook Partners
Connecticut
$3.19M +$3.45M +729,874 New
VFT
22
Vanguard Fiduciary Trust
Pennsylvania
$3.13M +$3.38M +717,011 New
Renaissance Technologies
23
Renaissance Technologies
New York
$2.96M +$8.03K +1,700 +0.3%
Bank of New York Mellon
24
Bank of New York Mellon
New York
$2.66M -$138K -29,282 -5%
Principal Financial Group
25
Principal Financial Group
Iowa
$2.34M -$624K -132,168 -20%
1
2 3 4 5

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.