CTKB in the 13F filings

Cytek Biosciences Inc · CUSIP 23285D109

Sector · Medical devices and instruments Theme · Healthcare: biopharma and medtech· L3VLUP-defined

Quarter

Q3 2026 · early filers Q2 2026 Q1 2026 Q4 2025 Q2 2023 Q1 2023 Q4 2022 Q3 2022 Q2 2022 Q1 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.

ActionShare of book at least

24 of 24 holders

				Action		Filing
Millennium Management LLC	9,338,010	$41m	under 0.1%	Added	+3,046,212	14 Aug 2026 (the filing on sec.gov)
Acadian Asset Management LLC	1,376,048	$6.1m	under 0.1%	Added	+977,060	13 Aug 2026 (the filing on sec.gov)
Arrowstreet Capital LP	973,833	$4.3m	under 0.1%	Added	+653,924	13 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC	906,162	$4.0m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Tudor Investment Corp	837,913	$3.7m	under 0.1%	Added	+517,198	14 Aug 2026 (the filing on sec.gov)
AQR Capital Management LLC	813,971	$3.6m	under 0.1%	Trimmed	-98,371	14 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC	721,470	$3.2m	under 0.1%	Added	+250,078	2 Sep 2026 (the filing on sec.gov)
Susquehanna International Group LLP	681,705	$3.0m	under 0.1%	Added	+625,695	14 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.	669,182	$3.0m	under 0.1%	Added	+409,057	14 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC	661,300	$2.9m	under 0.1%	Trimmed	-15,400	13 Aug 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	504,385	$2.2m	under 0.1%	Added	+220,999	13 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP	441,704	$2.0m	under 0.1%	New	new	13 Aug 2026 (the filing on sec.gov)
Point72 Asset Management LP	422,361	$1.9m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Invesco Ltd	185,671	$823k	under 0.1%	Trimmed	-202,562	14 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP	168,218	$745k	under 0.1%	Added	+142,618	14 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP	141,048	$616k	under 0.1%	Held	0	14 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	101,198	$449k	under 0.1%	Added	+21,056	14 Aug 2026 (the filing on sec.gov)
PDT Partners LLC	86,869	$385k	under 0.1%	Held	0	14 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC	82,776	$367k	under 0.1%	Added	+57,480	14 Aug 2026 (the filing on sec.gov)
Balyasny Asset Management LLC	54,381	$241k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP	36,140	$160k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Caxton Associates LLP	11,931	$53k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP	10,438	$46k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Quantbot Technologies LP	6,536	$29k	under 0.1%	New	new	12 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

Millennium Management LLCexisting position · 9,338,010 shares now+3,046,212
Acadian Asset Management LLCexisting position · 1,376,048 shares now+977,060
Jane Street Group LLCnew position · 906,162 shares now+906,162
Arrowstreet Capital LPexisting position · 973,833 shares now+653,924
Susquehanna International Group LLPexisting position · 681,705 shares now+625,695

Reductions

Invesco Ltdexisting position · 185,671 shares now-202,562
AQR Capital Management LLCexisting position · 813,971 shares now-98,371
Renaissance Technologies LLCexisting position · 661,300 shares now-15,400

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)

Neuberger Berman Group LLCwas $49k

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.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

CTKB by quarter
Quarter	Holders	Reported value	Buyers	Sellers
Q1 2022	1	$597k	n.a.	n.a.
Q2 2022	2	$22m	n.a.	n.a.
Q3 2022	1	$463k	n.a.	n.a.
Q4 2022	1	$320k	n.a.	n.a.
Q1 2023	1	$747k	n.a.	n.a.
Q2 2023	1	$987k	n.a.	n.a.
Q4 2025	1	$464k	10	15
Q1 2026	1	$380k	9	12
Q2 2026	1	$385k	19	4

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 →

Provided for information purposes only, not financial advice. The holdings shown here and anything drawn from them are illustrative, produced from assumptions you control, and must not be relied on for any investment, financial or business decision. Read the full notice

Not advice, and not a recommendation. Everything L3VLUP publishes is provided for information purposes only. Nothing here is financial, investment, legal, tax or accounting advice, a personal recommendation, or an offer or solicitation to buy or sell any security or financial instrument. It takes no account of anyone’s objectives, financial situation or needs.

Not a regulated adviser. L3VLUP does not provide regulated financial services. Speak to a suitably qualified and regulated professional before acting on anything you read here.

Illustrative figures. Default values are plausible starting points chosen so a model has somewhere to begin. They are not data, not a view on any company, and not calibrated to anything. Outputs move with whatever you type in.

Third-party data. Where live figures appear they come from third parties, including public filings and market feeds. They may be delayed, incomplete, restated, mis-tagged at source or simply wrong, and their providers do not endorse or verify this page. Every figure links to where it came from. Check it there before relying on it. Past performance is not a guide to future performance.

Company names and logos. Names, tickers and logos are the trademarks of their owners and appear only to identify the company whose public figures are being used. L3VLUP is not affiliated with, sponsored by or endorsed by any company shown, none of them took part in preparing the exercise, and nothing here is a statement by or about any of them. See third-party names and marks.

No warranty, and limited liability. This page is provided “as is” without warranty of any kind. To the fullest extent permitted by law, L3VLUP accepts no liability for any loss or damage arising from use of, or reliance on, anything on it. Nothing in this notice limits any liability that cannot lawfully be limited.

Full terms: Information Purposes and No Advice · Terms