CTKB in the 13F filings
Cytek Biosciences Inc · CUSIP 23285D109
- Quarter end
- 31 Mar 2026
- the date the book describes
- Filed
- 27 Oct 2026
- latest of these filings; the earliest 12 May 2026
- Managers listing it
- 17
- at least, of 95 tracked, among listed positions
- Comparable managers
- 91
- filed both Q4 2025 and Q1 2026; 1 listed it in both
- Shares listed
- 10,749,782
- combined, among listed positions
- Reported value
- $47m
- 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: 9 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +1,045,528.
Managers listing CTKB in Q1 2026
17 of 17 holders
Largest increases and reductions, by shares
Increases
- Millennium Management LLCexisting position · 6,291,798 shares now+1,539,351
- Tudor Investment Corpnew position · 320,715 shares now+320,715
- Citadel Advisors LLCexisting position · 471,392 shares now+304,638
- AQR Capital Management LLCexisting position · 912,342 shares now+168,887
- Fidelity (FMR LLC)existing position · 283,386 shares now+49,314
Reductions
- Acadian Asset Management LLCexisting position · 398,988 shares now-275,487
- Arrowstreet Capital LPexisting position · 319,909 shares now-41,768
- Invesco Ltdexisting position · 388,233 shares now-10,564
- PDT Partners LLCexisting position · 86,869 shares now-5,000
- Two Sigma Investments LPexisting position · 25,600 shares now-4,432
New positions and exits
New (2)
- Tudor Investment Corp$1.4m
- Squarepoint Ops LLC$111k
Exited (5)
- Wellington Management Group LLPwas $3.9m
- Point72 Asset Management LPwas $577k
- Jane Street Group LLCwas $398k
- Caxton Associates LLPwas $229k
- Quantbot Technologies LPwas $195k
Ownership over time
Tracked managers listing it, at least.
| 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 →