Cytek Biosciences
CTKB · NASDAQ
$5.34+$0.09 (+1.71%)TodayMarket closed ·
Prev close $5.25
Who owns CTKB
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 46.1% of CTKB’s shares.
- Millennium Management LLC7.2%
- BlackRock Institutional Trust Company, N.A.6.6%
- Boston Partners5.9%
- HHLR Advisors, Ltd.5.2%
- Next 6 largest institutions21.1%
- All other shareholders53.9%
| Holder | Shares | % of shares |
|---|---|---|
| Millennium Management LLC | 9.34M | 7.23% |
| BlackRock Institutional Trust Company, N.A. | 8.58M | 6.64% |
| Boston Partners | 7.66M | 5.93% |
| HHLR Advisors, Ltd. | 6.66M | 5.15% |
| Topline Capital Management, LLC | 6.28M | 4.87% |
| Jiang (Wenbin) | 5.56M | 4.31% |
| Vanguard Capital Management, LLC | 4.94M | 3.82% |
| Yan (Ming) | 4.82M | 3.73% |
| Geode Capital Management, L.L.C. | 3.06M | 2.37% |
| Dimensional Fund Advisors, L.P. | 2.62M | 2.03% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 3.53M | 2.73% |
| iShares Russell 2000 ETF | 3.15M | 2.44% |
| Column Small Cap Select Fund | 2.61M | 2.02% |
| Royce Micro-Cap Trust | 1.32M | 1.02% |
| Fidelity Small Cap Index Fund | 1.32M | 1.02% |
Insider trades
Form 4 filings by officers, directors and large holders
Insiders made no open-market buys or sales of CTKB in the last 6 months.
| Insider | Type | Shares | Value |
|---|---|---|---|
| McCombe William D. | Option exercise | 16.05K | — |
| McCombe William D. | Option exercise | 13.05K | — |
| McCombe William D. | Option exercise | 6.32K | — |
| McCombe William D. | Tax withholding | 5.40K | $25.22K |
| McCombe William D. | Option exercise | 16.05K | — |
| McCombe William D. | Tax withholding | 4.39K | $20.51K |
| McCombe William D. | Option exercise | 13.05K | — |
| McCombe William D. | Tax withholding | 2.11K | $9.86K |
| McCombe William D. | Option exercise | 6.32K | — |
| Yan Ming | Option exercise | 14.22K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 5.22M
- Days to cover
- 3.13
- % of shares outstanding
- 4.04%
- Average daily volume
- 1.67M
- Change since last report
- −0.5%
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