Cytek Biosciences, Inc. (CTKB)
Data as of , from SEC Form 4 filings.
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About Cytek Biosciences, Inc. (CTKB)
Cytek Biosciences Inc is a cell analysis solutions company advancing the next generation of research and clinical tools with its novel technical approach of leveraging the full spectrum of fluorescence signatures from multiple lasers to distinguish fluorescent tags on single cells. Its patented FSP technology optimizes sensitivity and accuracy through its optical and electronic designs that utilize an inventive method of light detection and distribution to a specifically selected number and type of detectors. Its FSP cell analyzers, the Cytek Aurora, Northern Lights, and Cytek Aurora Evo systems, deliver high-resolution, high-content and high-sensitivity cell analysis and address the inherent limitations of other technologies.
- FREMONT, CA
- 702
- 2021
- XNAS
CTKB Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Grant or award | 2 | 368,534 | |
| Option exercise | 28 | 400,318 | |
| Tax withholding / forfeiture | 11 | 56,261 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
CTKB insider transactions (Form 4)
18155 Form 4 filings on record, the earliest from Nov 20, 2024, newest first. Filing history page 1 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Wenbin Jiang - Officer | Option exercise | Common Stock | 11,781 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 2,869 footnote F2 | $4.67 | $13K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 22,100 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 5,382 footnote F2 | $4.67 | $25K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 29,002 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 7,062 footnote F2 | $4.67 | $33K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 57,212 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 20,956 footnote F2 | $4.67 | $98K | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 11,781 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 22,100 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 29,002 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 57,212 | $0.00 | - | |
| ||||||
| William D. McCombe - Officer | Option exercise | Common Stock | 6,320 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 2,111 footnote F2 | $4.67 | $10K | |
| William D. McCombe - Officer | Option exercise | Common Stock | 13,051 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 4,392 footnote F2 | $4.67 | $21K | |
| William D. McCombe - Officer | Option exercise | Common Stock | 16,049 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 5,401 footnote F2 | $4.67 | $25K | |
| William D. McCombe - Officer | Option exercise | Restricted Stock Units | 6,320 | $0.00 | - | |
| William D. McCombe - Officer | Option exercise | Restricted Stock Units | 13,051 | $0.00 | - | |
| William D. McCombe - Officer | Option exercise | Restricted Stock Units | 16,049 | $0.00 | - | |
| ||||||
| Glenn P. Muir - Director | Option exercise | Common Stock | 3,086 | - footnote F1 | - | |
| Glenn P. Muir - Director | Option exercise | Restricted Stock Units | 3,086 | $0.00 | - | |
| ||||||
| Michael Holder - Director | Option exercise | Common Stock | 2,181 | - footnote F1 | - | |
| Michael Holder - Director | Option exercise | Restricted Stock Units | 2,181 | $0.00 | - | |
| ||||||
| Richard Chin - Director | Option exercise | Common Stock | 6,107 | - footnote F1 | - | |
| Richard Chin - Director | Option exercise | Restricted Stock Units | 6,107 | $0.00 | - | |
| ||||||
| Ming Yan - Officer | Option exercise | Common Stock | 7,363 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,778 footnote F2 | $4.67 | $8K | |
| Ming Yan - Officer | Option exercise | Common Stock | 5,525 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,346 footnote F2 | $4.67 | $6K | |
| Ming Yan - Officer | Option exercise | Common Stock | 6,162 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,501 footnote F2 | $4.67 | $7K | |
| Ming Yan - Officer | Option exercise | Common Stock | 14,220 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 3,463 footnote F2 | $4.67 | $16K | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 7,363 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 5,525 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 6,162 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 14,220 | $0.00 | - | |
| ||||||
| Ilan Feuchtwang - Officer | Grant or award | Restricted Stock Units | 241,416 | $0.00 | - | |
| Ilan Feuchtwang - Officer | Grant or award | Employee Stock Option (right to buy) | 127,118 | $0.00 | - | |
| Ming Yan - Officer | Gift | Common Stock | 135,892 | $0.00 | - | |
| Jack Ball | Option exercise | Common Stock | 43,973 | - footnote F1 | - | |
| Jack Ball | Option exercise | Restricted Stock Units | 43,973 | $0.00 | - | |
| ||||||
| Glenn P. Muir | Grant or award | Restricted Stock Units | 55,555 | $0.00 | - | |
| Glenn P. Muir | Grant or award | Director Stock Option (right to buy) | 29,835 | $0.00 | - | |
| Richard Chin | Grant or award | Restricted Stock Units | 33,333 | $0.00 | - | |
| Richard Chin | Grant or award | Director Stock Option (right to buy) | 18,261 | $0.00 | - | |
| Vera Imper | Option exercise | Common Stock | 43,973 | - footnote F1 | - | |
| Vera Imper | Grant or award | Restricted Stock Units | 33,333 | $0.00 | - | |
| Vera Imper | Grant or award | Director Stock Option (right to buy) | 18,261 | $0.00 | - | |
| Vera Imper | Option exercise | Restricted Stock Units | 43,973 | $0.00 | - | |
| ||||||
| Deborah J. Neff | Option exercise | Common Stock | 43,973 | - footnote F1 | - | |
| Deborah J. Neff | Grant or award | Restricted Stock Units | 33,333 | $0.00 | - | |
| Deborah J. Neff | Grant or award | Director Stock Option (right to buy) | 18,261 | $0.00 | - | |
| Deborah J. Neff | Option exercise | Restricted Stock Units | 43,973 | $0.00 | - | |
| ||||||
| Michael Holder | Grant or award | Restricted Stock Units | 33,333 | $0.00 | - | |
| Michael Holder | Grant or award | Director Stock Option (right to buy) | 18,261 | $0.00 | - | |
| Michael Holder | Option exercise | Restricted Stock Units | 43,973 | $0.00 | - | |
| Michael Holder | Option exercise | Common Stock | 43,973 | - footnote F1 | - | |
| ||||||
| Michael Holder | Option exercise | Common Stock | 1,454 | - footnote F1 | - | |
| Michael Holder | Option exercise | Restricted Stock Units | 1,454 | $0.00 | - | |
| ||||||
| Richard Chin | Option exercise | Common Stock | 6,107 | - footnote F1 | - | |
| Richard Chin | Option exercise | Restricted Stock Units | 6,107 | $0.00 | - | |
| ||||||
| Ming Yan - Officer | Option exercise | Common Stock | 4,908 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,224 footnote F2 | $3.55 | $4K | |
| Ming Yan - Officer | Option exercise | Common Stock | 3,683 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 919 footnote F2 | $3.55 | $3K | |
| Ming Yan - Officer | Option exercise | Common Stock | 4,108 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,025 footnote F2 | $3.55 | $4K | |
| Ming Yan - Officer | Option exercise | Common Stock | 9,480 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 2,364 footnote F2 | $3.55 | $8K | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 4,908 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 3,683 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 4,108 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 9,480 | $0.00 | - | |
| ||||||
| Philippe Busque - Officer | Option exercise | Common Stock | 1,024 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 263 footnote F2 | $3.55 | $934 | |
| Philippe Busque - Officer | Option exercise | Common Stock | 1,473 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 378 footnote F2 | $3.55 | $1K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 2,416 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 620 footnote F2 | $3.55 | $2K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 5,551 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 1,424 footnote F2 | $3.55 | $5K | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 1,024 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 1,473 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 2,416 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 5,551 | $0.00 | - | |
| ||||||
| Wenbin Jiang - Officer | Option exercise | Common Stock | 7,854 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 1,913 footnote F2 | $3.55 | $7K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 14,733 footnote F2 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 3,588 footnote F2 | $3.55 | $13K | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 19,334 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 38,141 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 19,334 footnote F2 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 5,032 footnote F2 | $3.55 | $18K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 38,141 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 15,009 footnote F2 | $3.55 | $53K | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 7,854 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 14,733 | $0.00 | - | |
| ||||||
| William D. McCombe - Officer | Option exercise | Common Stock | 6,320 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 2,268 footnote F2 | $3.55 | $8K | |
| William D. McCombe - Officer | Option exercise | Common Stock | 8,700 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 3,122 footnote F2 | $3.55 | $11K | |
| William D. McCombe - Officer | Option exercise | Common Stock | 10,699 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 3,839 footnote F2 | $3.55 | $14K | |
| William D. McCombe - Officer | Option exercise | Restricted Stock Units | 6,320 | $0.00 | - | |
| William D. McCombe - Officer | Option exercise | Restricted Stock Units | 8,700 | $0.00 | - | |
| William D. McCombe - Officer | Option exercise | Restricted Stock Units | 10,699 | $0.00 | - | |
| ||||||
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 3,386 footnote F2 | $3.55 | $12K | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 2,454 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 2,454 | - footnote F1 | - | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 9,435 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 881 footnote F2 | $3.55 | $3K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 5,156 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 1,850 footnote F2 | $3.55 | $7K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 7,250 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 2,602 footnote F2 | $3.55 | $9K | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 5,156 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 7,250 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 9,435 | $0.00 | - | |
| ||||||
| Ming Yan - Officer | Gift | Common Stock | 1,176,000 | $0.00 | - | |
| Richard Chin | Option exercise | Common Stock | 6,107 | - footnote F1 | - | |
| Richard Chin | Option exercise | Restricted Stock Units | 6,107 | $0.00 | - | |
| ||||||
| Valerie Barnett - Officer | Option exercise | Common Stock | 10,313 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 4,247 footnote F2 | $4.23 | $18K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 14,501 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 5,740 footnote F2 | $4.23 | $24K | |
| Valerie Barnett - Officer | Grant or award | Employee Stock Option (right to buy) | 120,114 | $0.00 | - | |
| Valerie Barnett - Officer | Grant or award | Restricted Stock Units | 226,453 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 4,908 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 10,313 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 14,501 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 4,908 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 1,761 footnote F2 | $4.23 | $7K | |
| ||||||
| Philippe Busque - Officer | Grant or award | Restricted Stock Units | 133,226 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 2,049 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 2,946 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 4,833 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Common Stock | 2,049 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 635 footnote F2 | $4.23 | $3K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 2,946 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 912 footnote F2 | $4.23 | $4K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 4,833 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 1,496 footnote F2 | $4.23 | $6K | |
| Philippe Busque - Officer | Grant or award | Employee Stock Option (right to buy) | 70,665 | $0.00 | - | |
| ||||||
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 9,416 footnote F2 | $4.23 | $40K | |
| Wenbin Jiang - Officer | Grant or award | Employee Stock Option (right to buy) | 485,545 | $0.00 | - | |
| Wenbin Jiang - Officer | Grant or award | Restricted Stock Units | 915,407 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 15,708 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 29,467 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 38,669 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 15,708 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 3,825 footnote F2 | $4.23 | $16K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 29,467 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 7,747 footnote F2 | $4.23 | $33K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 38,669 | - footnote F1 | - | |
| ||||||
| William D. McCombe - Officer | Option exercise | Common Stock | 17,401 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 7,145 footnote F2 | $4.23 | $30K | |
| William D. McCombe - Officer | Grant or award | Employee Stock Option (right to buy) | 136,205 | $0.00 | - | |
| William D. McCombe - Officer | Grant or award | Restricted Stock Units | 256,790 | $0.00 | - | |
| William D. McCombe - Officer | Option exercise | Restricted Stock Units | 6,320 | $0.00 | - | |
| William D. McCombe - Officer | Option exercise | Restricted Stock Units | 17,401 | $0.00 | - | |
| William D. McCombe - Officer | Option exercise | Common Stock | 6,320 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 2,603 footnote F2 | $4.23 | $11K | |
| ||||||
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 3,047 footnote F2 | $4.23 | $13K | |
| Ming Yan - Officer | Option exercise | Common Stock | 7,366 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 2,287 footnote F2 | $4.23 | $10K | |
| Ming Yan - Officer | Option exercise | Common Stock | 8,217 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 2,397 footnote F2 | $4.23 | $10K | |
| Ming Yan - Officer | Grant or award | Employee Stock Option (right to buy) | 120,688 | $0.00 | - | |
| Ming Yan - Officer | Grant or award | Restricted Stock Units | 227,535 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 9,817 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 7,366 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 8,217 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Common Stock | 9,817 | - footnote F1 | - | |
| ||||||
| Michael Holder | Option exercise | Common Stock | 2,908 | - footnote F1 | - | |
| Michael Holder | Option exercise | Restricted Stock Units | 2,908 | $0.00 | - | |
| ||||||
| Wenbin Jiang - Officer | Option exercise | Common Stock | 4,514 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 1,339 footnote F2 | $4.20 | $6K | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 4,514 | $0.00 | - | |
| ||||||
Item 5.03, 9.01
Item 7.01, 8.01, 9.01
Item 2.02, 9.01
Item 5.02
Recent CTKB Form 144 notices of proposed sale
1An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| PHILIPPE BUSQUE | Officer | 31,666 | $147K | View on EDGAR |
CTKB insider trading FAQ
What is the latest insider trade for CTKB?
Cytek Biosciences, Inc. (CTKB) had 7 insider filings in the last 90 days, with the most recent on 2026-08-20. The full record for CTKB runs to 55 Form 4 filings, the earliest from 2024-11-20. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying CTKB stock?
No insider purchases of CTKB were filed in the last 90 days.
How many insiders are selling CTKB stock?
No insider sales of CTKB were filed in the last 90 days.
Where can I see CTKB SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects CTKB Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Health Care companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Wenbin Jiang view on EDGAR
- - William D. McCombe view on EDGAR
- - Glenn P. Muir view on EDGAR
- - Michael Holder view on EDGAR
- - Richard Chin view on EDGAR
- - Ming Yan view on EDGAR
- - Ilan Feuchtwang view on EDGAR
- - Ming Yan view on EDGAR
- - Jack Ball view on EDGAR
Related companies with recent insider activity
Learn more
- What the Form 4 transaction codes mean
- Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Health Care
- Where CTKB's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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