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)
16655 Form 4 filings on record, the earliest from Nov 20, 2024, newest first. Filing history page 2 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 1,332 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Common Stock | 1,332 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 395 footnote F2 | $4.20 | $2K | |
| ||||||
| Valerie Barnett - Officer | Option exercise | Common Stock | 1,346 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 525 footnote F2 | $4.20 | $2K | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 1,346 | $0.00 | - | |
| ||||||
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 3,625 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Common Stock | 1,536 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 393 footnote F2 | $5.53 | $2K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 2,210 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 565 footnote F2 | $5.53 | $3K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 3,625 | - footnote F1 | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 927 footnote F2 | $5.53 | $5K | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 1,536 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 2,210 | $0.00 | - | |
| ||||||
| William D. McCombe - Officer | Option exercise | Common Stock | 6,320 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 2,032 footnote F2 | $5.53 | $11K | |
| William D. McCombe - Officer | Option exercise | Common Stock | 13,051 | - footnote F1 | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 4,196 footnote F2 | $5.53 | $23K | |
| 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 | - | |
| ||||||
| Ming Yan - Officer | Option exercise | Common Stock | 6,162 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,501 footnote F2 | $5.53 | $8K | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 1,981 | $0.00 | - | |
| 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 | Common Stock | 1,981 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 483 footnote F2 | $5.53 | $3K | |
| Ming Yan - Officer | Option exercise | Common Stock | 7,363 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,793 footnote F2 | $5.53 | $10K | |
| Ming Yan - Officer | Option exercise | Common Stock | 5,525 | - footnote F1 | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,346 footnote F2 | $5.53 | $7K | |
| ||||||
| Valerie Barnett - Officer | Option exercise | Common Stock | 7,735 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 2,487 footnote F2 | $5.53 | $14K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 10,875 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 3,497 footnote F2 | $5.53 | $19K | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 2,016 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 3,681 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 7,735 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 10,875 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 2,016 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 649 footnote F2 | $5.53 | $4K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 3,681 | - footnote F1 | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 1,184 footnote F2 | $5.53 | $7K | |
| ||||||
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 8,697 footnote F2 | $5.53 | $48K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 29,002 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 11,413 footnote F2 | $5.53 | $63K | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 6,758 | $0.00 | - | |
| 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 | Common Stock | 6,758 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 2,660 footnote F2 | $5.53 | $15K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 11,781 | - footnote F1 | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 4,636 footnote F2 | $5.53 | $26K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 22,100 | - footnote F1 | - | |
| ||||||
| Michael Holder | Option exercise | Restricted Stock Units | 2,181 | $0.00 | - | |
| Michael Holder | Option exercise | Common Stock | 2,181 | - footnote F1 | - | |
| ||||||
| Richard Chin | Option exercise | Common Stock | 6,107 | - footnote F1 | - | |
| Richard Chin | Option exercise | Restricted Stock Units | 6,107 | $0.00 | - | |
| ||||||
| Philippe Busque - Officer | Option exercise | Common Stock | 1,536 | - | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 599 | $4.06 | $2K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 2,210 | - | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 861 | $4.06 | $3K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 3,625 | - | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 1,412 | $4.06 | $6K | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 1,536 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 2,210 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 3,625 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Common Stock | 1,981 | - | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 588 | $4.06 | $2K | |
| Ming Yan - Officer | Option exercise | Common Stock | 7,363 | - | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 2,184 | $4.06 | $9K | |
| Ming Yan - Officer | Option exercise | Common Stock | 5,525 | - | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,498 | $4.06 | $6K | |
| Ming Yan - Officer | Option exercise | Common Stock | 6,162 | - | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,468 | $4.06 | $6K | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 1,981 | $0.00 | - | |
| 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 | - | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 2,016 | - | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 786 | $4.06 | $3K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 3,681 | - | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 1,434 | $4.06 | $6K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 7,735 | - | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 3,000 | $4.06 | $12K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 10,875 | - | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 3,609 | $4.06 | $15K | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 2,016 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 3,681 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 7,735 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 10,875 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 6,758 | - | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 1,646 | $4.06 | $7K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 11,781 | - | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 2,869 | $4.06 | $12K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 22,100 | - | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 5,382 | $4.06 | $22K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 29,002 | - | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 7,062 | $4.06 | $29K | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 6,758 | $0.00 | - | |
| 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 | - | |
| William D. McCombe - Officer | Option exercise | Common Stock | 6,320 | - | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 2,462 | $4.06 | $10K | |
| William D. McCombe - Officer | Option exercise | Common Stock | 13,051 | - | - | |
| William D. McCombe - Officer | Tax withholding / forfeiture | Common Stock | 5,084 | $4.06 | $21K | |
| 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 | - | |
| Michael Holder | Option exercise | Common Stock | 2,181 | $0.00 | - | |
| Michael Holder | Option exercise | Restricted Stock Units | 2,181 | $0.00 | - | |
| Richard Chin | Option exercise | Common Stock | 4,071 | - | - | |
| Richard Chin | Option exercise | Restricted Stock Units | 4,071 | $0.00 | - | |
| Deborah J. Neff | Grant or award | Restricted Stock Units | 43,973 | $0.00 | - | |
| Deborah J. Neff | Grant or award | Director Stock Option (right to buy) | 23,809 | $0.00 | - | |
| Deborah J. Neff | Option exercise | Common Stock | 15,706 | - | - | |
| Deborah J. Neff | Option exercise | Restricted Stock Units | 15,706 | $0.00 | - | |
| Don M. Hardison | Option exercise | Common Stock | 15,706 | - | - | |
| Don M. Hardison | Option exercise | Restricted Stock Units | 15,706 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Common Stock | 1,536 | - | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 599 | $6.03 | $4K | |
| Philippe Busque - Officer | Option exercise | Common Stock | 2,210 | - | - | |
| Philippe Busque - Officer | Tax withholding / forfeiture | Common Stock | 861 | $6.03 | $5K | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 1,536 | $0.00 | - | |
| Philippe Busque - Officer | Option exercise | Restricted Stock Units | 2,210 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 2,016 | - | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 661 | $6.03 | $4K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 3,681 | - | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 1,235 | $6.03 | $7K | |
| Valerie Barnett - Officer | Option exercise | Common Stock | 7,735 | - | - | |
| Valerie Barnett - Officer | Tax withholding / forfeiture | Common Stock | 2,603 | $6.03 | $16K | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 2,016 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 3,681 | $0.00 | - | |
| Valerie Barnett - Officer | Option exercise | Restricted Stock Units | 7,735 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 6,758 | - | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 1,646 | $6.03 | $10K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 11,781 | - | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 2,869 | $6.03 | $17K | |
| Wenbin Jiang - Officer | Option exercise | Common Stock | 22,100 | - | - | |
| Wenbin Jiang - Officer | Tax withholding / forfeiture | Common Stock | 5,382 | $6.03 | $32K | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 6,758 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 11,781 | $0.00 | - | |
| Wenbin Jiang - Officer | Option exercise | Restricted Stock Units | 22,100 | $0.00 | - | |
| Allen Poirson - Officer | Option exercise | Common Stock | 790 | - | - | |
| Allen Poirson - Officer | Tax withholding / forfeiture | Common Stock | 308 | $6.03 | $2K | |
| Allen Poirson - Officer | Option exercise | Common Stock | 2,503 | - | - | |
| Allen Poirson - Officer | Tax withholding / forfeiture | Common Stock | 975 | $6.03 | $6K | |
| Allen Poirson - Officer | Option exercise | Common Stock | 1,878 | - | - | |
| Allen Poirson - Officer | Tax withholding / forfeiture | Common Stock | 732 | $6.03 | $4K | |
| Allen Poirson - Officer | Option exercise | Restricted Stock Units | 790 | $0.00 | - | |
| Allen Poirson - Officer | Option exercise | Restricted Stock Units | 2,503 | $0.00 | - | |
| Allen Poirson - Officer | Option exercise | Restricted Stock Units | 1,878 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Common Stock | 1,981 | - | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 483 | $6.03 | $3K | |
| Ming Yan - Officer | Option exercise | Common Stock | 7,363 | - | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,793 | $6.03 | $11K | |
| Ming Yan - Officer | Option exercise | Common Stock | 5,525 | - | - | |
| Ming Yan - Officer | Tax withholding / forfeiture | Common Stock | 1,346 | $6.03 | $8K | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 1,981 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 7,363 | $0.00 | - | |
| Ming Yan - Officer | Option exercise | Restricted Stock Units | 5,525 | $0.00 | - | |
| Michael Holder | Option exercise | Common Stock | 2,181 | - | - | |
| Michael Holder | Option exercise | Restricted Stock Units | 2,181 | $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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