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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
30 Jun 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 Aug 2026
Managers listing it
24
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 1 listed it in both
Shares listed
19,233,250
combined, among listed positions
Reported value
$85m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 19 buyers (opened or added shares) and 4 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +8,483,468.

Managers listing CTKB in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

24 of 24 holders

ActionFiling
Millennium Management LLC9,338,010$41munder 0.1%Added+3,046,21214 Aug 2026 (the filing on sec.gov)
Acadian Asset Management LLC1,376,048$6.1munder 0.1%Added+977,06013 Aug 2026 (the filing on sec.gov)
Arrowstreet Capital LP973,833$4.3munder 0.1%Added+653,92413 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC906,162$4.0munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Tudor Investment Corp837,913$3.7munder 0.1%Added+517,19814 Aug 2026 (the filing on sec.gov)
AQR Capital Management LLC813,971$3.6munder 0.1%Trimmed-98,37114 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC721,470$3.2munder 0.1%Added+250,0782 Sep 2026 (the filing on sec.gov)
Susquehanna International Group LLP681,705$3.0munder 0.1%Added+625,69514 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.669,182$3.0munder 0.1%Added+409,05714 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC661,300$2.9munder 0.1%Trimmed-15,40013 Aug 2026 (the filing on sec.gov)
Fidelity (FMR LLC)504,385$2.2munder 0.1%Added+220,99913 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP441,704$2.0munder 0.1%Newnew13 Aug 2026 (the filing on sec.gov)
Point72 Asset Management LP422,361$1.9munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Invesco Ltd185,671$823kunder 0.1%Trimmed-202,56214 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP168,218$745kunder 0.1%Added+142,61814 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP141,048$616kunder 0.1%Held014 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc101,198$449kunder 0.1%Added+21,05614 Aug 2026 (the filing on sec.gov)
PDT Partners LLC86,869$385kunder 0.1%Held014 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC82,776$367kunder 0.1%Added+57,48014 Aug 2026 (the filing on sec.gov)
Balyasny Asset Management LLC54,381$241kunder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP36,140$160kunder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Caxton Associates LLP11,931$53kunder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP10,438$46kunder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Quantbot Technologies LP6,536$29kunder 0.1%Newnew12 Aug 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

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 (8)

Exited (1)

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
Drawing every quarter on file…

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 →