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CTKB in the 13F filings

Cytek Biosciences Inc · CUSIP 23285D109

Sector · Medical devices and instrumentsTheme · Healthcare: biopharma and medtech· L3VLUP-defined
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q2 2023Q1 2023Q4 2022Q3 2022Q2 2022Q1 2022
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 10 Feb 2026
Managers listing it
20
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 0 listed it in both
Shares listed
9,704,254
combined, among listed positions
Reported value
$49m
combined, at the quarter end

Among the 92 comparable managers: 10 buyers (opened or added shares) and 15 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,829,720.

Managers listing CTKB in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

20 of 20 holders

ActionFiling
Millennium Management LLC4,752,447$24munder 0.1%Added+1,334,06517 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP764,279$3.9munder 0.1%Trimmed-1,776,76717 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC743,455$3.8munder 0.1%Trimmed-276,43517 Feb 2026 (the filing on sec.gov)
Renaissance Technologies LLC675,000$3.4munder 0.1%Trimmed-120,54412 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC674,475$3.4munder 0.1%Added+108,90210 Feb 2026 (the filing on sec.gov)
Invesco Ltd398,797$2.0munder 0.1%Added+9,67119 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP361,677$1.8munder 0.1%Added+38713 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.263,126$1.3munder 0.1%Added+142,10417 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)234,072$1.2munder 0.1%Added+53,28617 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC166,754$842kunder 0.1%Added+84,45017 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP141,048$712kunder 0.1%Trimmed-8,60017 Feb 2026 (the filing on sec.gov)
Point72 Asset Management LP114,256$577kunder 0.1%Trimmed-73,36217 Feb 2026 (the filing on sec.gov)
PDT Partners LLC91,869$464kunder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC78,758$398kunder 0.1%Trimmed-278,26712 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc69,793$353kunder 0.1%Added+7,65817 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP48,103$243kunder 0.1%Trimmed-144,75017 Feb 2026 (the filing on sec.gov)
Caxton Associates LLP45,376$229kunder 0.1%Trimmed-48,03213 Feb 2026 (the filing on sec.gov)
Quantbot Technologies LP38,533$195kunder 0.1%Added+4,62610 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP30,032$152kunder 0.1%Trimmed-145,72717 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC12,404$63kunder 0.1%Newnew27 Oct 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

There is no earlier quarter on file to compare with.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (1)

Exited (6)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
2 in Q2 2022 to 1 in Q2 2026

Tracked managers listing it, at least.

01122Q1 2022Q2 2022Q3 2022Q4 2022Q1 2023Q2 2023Q4 2025Q1 2026Q2 2026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
CTKB by quarter
QuarterHoldersReported valueBuyersSellers
Q1 20221$597kn.a.n.a.
Q2 20222$22mn.a.n.a.
Q3 20221$463kn.a.n.a.
Q4 20221$320kn.a.n.a.
Q1 20231$747kn.a.n.a.
Q2 20231$987kn.a.n.a.
Q4 20251$464k1015
Q1 20261$380k912
Q2 20261$385k194

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

CTKB and LLY →CTKB and JNJ →CTKB and VRTX →Choose a stock to compare with CTKB →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own CTKB, latest filings →Back to the 13F Explorer →