Stock Ownership/CTKB

CYTEK BIOSCIENCES INC (CTKB): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in CTKB · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
18
13F filers
Aggregate Value
$100.1M
Across holders
Last Price
$4.44
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity14 increased3 reduced0 exited
Institutional Holders of CTKB
↗
18 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund9.34M$41.4M41.3%0.0%Added+$13.5MQ2 2026
HHLR ADVISORS, LTD.
CIK 0001762304
Hedge Fund6.66M$29.5M29.5%3.5%Unchanged+$0Q2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
Hedge Fund974K$4.3M4.3%0.0%Added+$2.9MQ2 2026
TUDOR INVESTMENT CORP ET AL
CIK 0000923093
Hedge Fund838K$3.7M3.7%0.0%Added+$2.3MQ2 2026
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
Hedge Fund814K$3.6M3.6%0.0%Reduced+$3.6MQ2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund721K$3.2M3.2%0.0%Added+$1.1MQ2 2026
Qube Research & Technologies Ltd
CIK 0001729829
Hedge Fund690K$3.1M3.1%0.0%Added—Q2 2026
SHAW D E & CO INC
CIK 0001009207
Hedge Fund669K$3.0M3.0%0.0%Added+$660KQ2 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
Hedge Fund661K$2.9M2.9%0.0%Reduced$-68KQ2 2026
MARSHALL WACE, LLP
CIK 0001318757
Hedge Fund442K$2.0M2.0%0.0%Added—Q2 2026
MILLENNIUM MANAGEMENT LLCAdded
Hedge Fund
$41.4M· 41.3% of total· 0.0% port· 9.34M sh· +$13.5M QoQ· Q2 2026
HHLR ADVISORS, LTD.Unchanged
Hedge Fund
$29.5M· 29.5% of total· 3.5% port· 6.66M sh· +$0 QoQ· Q2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPAdded
Hedge Fund
$4.3M· 4.3% of total· 0.0% port· 974K sh· +$2.9M QoQ· Q2 2026
TUDOR INVESTMENT CORP ET ALAdded
Hedge Fund
$3.7M· 3.7% of total· 0.0% port· 838K sh· +$2.3M QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCReduced
Hedge Fund
$3.6M· 3.6% of total· 0.0% port· 814K sh· +$3.6M QoQ· Q2 2026
CITADEL ADVISORS LLCAdded
Hedge Fund
$3.2M· 3.2% of total· 0.0% port· 721K sh· +$1.1M QoQ· Q2 2026
Qube Research & Technologies LtdAdded
Hedge Fund
$3.1M· 3.1% of total· 0.0% port· 690K sh· — QoQ· Q2 2026
SHAW D E & CO INCAdded
Hedge Fund
$3.0M· 3.0% of total· 0.0% port· 669K sh· +$660K QoQ· Q2 2026
RENAISSANCE TECHNOLOGIES LLCReduced
Hedge Fund
$2.9M· 2.9% of total· 0.0% port· 661K sh· $-68K QoQ· Q2 2026
MARSHALL WACE, LLPAdded
Hedge Fund
$2.0M· 2.0% of total· 0.0% port· 442K sh· — QoQ· Q2 2026
Point72 Asset Management, L.P.Added
Hedge Fund
$1.9M· 1.9% of total· 0.0% port· 422K sh· — QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPAdded
Hedge Fund
$745K· 0.7% of total· 0.0% port· 168K sh· +$632K QoQ· Q2 2026
Squarepoint Ops LLCAdded
Hedge Fund
$367K· 0.4% of total· 0.0% port· 83K sh· +$255K QoQ· Q2 2026
BALYASNY ASSET MANAGEMENT LLCAdded
Hedge Fund
$241K· 0.2% of total· 0.0% port· 54K sh· — QoQ· Q2 2026
ExodusPoint Capital Management, LPAdded
Hedge Fund
$160K· 0.2% of total· 0.0% port· 36K sh· — QoQ· Q2 2026
CAXTON ASSOCIATES LLPAdded
Hedge Fund
$53K· 0.1% of total· 0.0% port· 12K sh· — QoQ· Q2 2026
Brevan Howard Capital Management LPAdded
Hedge Fund
$46K· 0.0% of total· 0.0% port· 10K sh· — QoQ· Q2 2026
Rockefeller Capital Management L.P.Reduced
Hedge Fund
$11K· 0.0% of total· 0.0% port· 2K sh· $-26K QoQ· Q2 2026
1–10 of 18
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