CYTEK BIOSCIENCES INC (CTKB) — insider trading
Health Care · NASDAQ
CYTEK BIOSCIENCES INC (CTKB) has 121 reported SEC Form 4 insider transactions in our data (latest 2026-08-18).
Recent Form 4 transactions
Showing the 100 most recent of 121 recorded transactions. See all on SEC EDGAR →
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Option exercise / conversion (derivative) | 14,220 | — | $0 | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Option exercise / conversion (derivative) | 6,162 | — | $0 | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Option exercise / conversion (derivative) | 5,525 | — | $0 | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Option exercise / conversion (derivative) | 7,363 | — | $0 | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Shares withheld for taxes / exercise cost | 3,463 | $4.67 | $16.2K | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Option exercise / conversion | 14,220 | — | — | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Shares withheld for taxes / exercise cost | 1,501 | $4.67 | $7.0K | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Option exercise / conversion | 6,162 | — | — | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Shares withheld for taxes / exercise cost | 1,346 | $4.67 | $6.3K | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Option exercise / conversion | 5,525 | — | — | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Shares withheld for taxes / exercise cost | 1,778 | $4.67 | $8.3K | Form 4 |
| 2026-08-18 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Option exercise / conversion | 7,363 | — | — | Form 4 |
| 2026-08-18 | Chin Richard | Director | Option exercise / conversion (derivative) | 6,107 | — | $0 | Form 4 |
| 2026-08-18 | Chin Richard | Director | Option exercise / conversion | 6,107 | — | — | Form 4 |
| 2026-08-18 | Holder Michael | Director | Option exercise / conversion (derivative) | 2,181 | — | $0 | Form 4 |
| 2026-08-18 | Holder Michael | Director | Option exercise / conversion | 2,181 | — | — | Form 4 |
| 2026-08-18 | MUIR GLENN P | Director | Option exercise / conversion (derivative) | 3,086 | — | $0 | Form 4 |
| 2026-08-18 | MUIR GLENN P | Director | Option exercise / conversion | 3,086 | — | — | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion (derivative) | 16,049 | — | $0 | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion (derivative) | 13,051 | — | $0 | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion (derivative) | 6,320 | — | $0 | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Shares withheld for taxes / exercise cost | 5,401 | $4.67 | $25.2K | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion | 16,049 | — | — | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Shares withheld for taxes / exercise cost | 4,392 | $4.67 | $20.5K | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion | 13,051 | — | — | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Shares withheld for taxes / exercise cost | 2,111 | $4.67 | $9.9K | Form 4 |
| 2026-08-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion | 6,320 | — | — | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion (derivative) | 57,212 | — | $0 | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion (derivative) | 29,002 | — | $0 | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion (derivative) | 22,100 | — | $0 | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion (derivative) | 11,781 | — | $0 | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Shares withheld for taxes / exercise cost | 20,956 | $4.67 | $97.9K | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion | 57,212 | — | — | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Shares withheld for taxes / exercise cost | 7,062 | $4.67 | $33.0K | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion | 29,002 | — | — | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Shares withheld for taxes / exercise cost | 5,382 | $4.67 | $25.1K | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion | 22,100 | — | — | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Shares withheld for taxes / exercise cost | 2,869 | $4.67 | $13.4K | Form 4 |
| 2026-08-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion | 11,781 | — | — | Form 4 |
| 2026-08-10 | Feuchtwang Ilan | Officer (Chief Legal Officer, Secretary) | Grant / award / vesting (derivative) | 127,118 | — | $0 | Form 4 |
| 2026-08-10 | Feuchtwang Ilan | Officer (Chief Legal Officer, Secretary) | Grant / award / vesting (derivative) | 241,416 | — | $0 | Form 4 |
| 2026-06-12 | Yan Ming | Director, Officer (CHIEF TECHNOLOGY OFFICER) | Bona fide gift | 135,892 | — | $0 | Form 4 |
| 2026-06-10 | Holder Michael | Director | Option exercise / conversion (derivative) | 43,973 | — | $0 | Form 4 |
| 2026-06-10 | Holder Michael | Director | Grant / award / vesting (derivative) | 18,261 | — | $0 | Form 4 |
| 2026-06-10 | Holder Michael | Director | Grant / award / vesting (derivative) | 33,333 | — | $0 | Form 4 |
| 2026-06-10 | Holder Michael | Director | Option exercise / conversion | 43,973 | — | — | Form 4 |
| 2026-06-10 | NEFF DEBORAH J | Director | Option exercise / conversion (derivative) | 43,973 | — | $0 | Form 4 |
| 2026-06-10 | NEFF DEBORAH J | Director | Grant / award / vesting (derivative) | 18,261 | — | $0 | Form 4 |
| 2026-06-10 | NEFF DEBORAH J | Director | Grant / award / vesting (derivative) | 33,333 | — | $0 | Form 4 |
| 2026-06-10 | NEFF DEBORAH J | Director | Option exercise / conversion | 43,973 | — | — | Form 4 |
| 2026-06-10 | Imper Vera | Director | Option exercise / conversion (derivative) | 43,973 | — | $0 | Form 4 |
| 2026-06-10 | Imper Vera | Director | Grant / award / vesting (derivative) | 18,261 | — | $0 | Form 4 |
| 2026-06-10 | Imper Vera | Director | Grant / award / vesting (derivative) | 33,333 | — | $0 | Form 4 |
| 2026-06-10 | Imper Vera | Director | Option exercise / conversion | 43,973 | — | — | Form 4 |
| 2026-06-10 | Chin Richard | Director | Grant / award / vesting (derivative) | 18,261 | — | $0 | Form 4 |
| 2026-06-10 | Chin Richard | Director | Grant / award / vesting (derivative) | 33,333 | — | $0 | Form 4 |
| 2026-06-10 | MUIR GLENN P | Director | Grant / award / vesting (derivative) | 29,835 | — | $0 | Form 4 |
| 2026-06-10 | MUIR GLENN P | Director | Grant / award / vesting (derivative) | 55,555 | — | $0 | Form 4 |
| 2026-06-10 | Ball Jack | Director | Option exercise / conversion (derivative) | 43,973 | — | $0 | Form 4 |
| 2026-06-10 | Ball Jack | Director | Option exercise / conversion | 43,973 | — | — | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Option exercise / conversion (derivative) | 9,435 | — | $0 | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Option exercise / conversion (derivative) | 7,250 | — | $0 | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Option exercise / conversion (derivative) | 5,156 | — | $0 | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Option exercise / conversion (derivative) | 2,454 | — | $0 | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Shares withheld for taxes / exercise cost | 3,386 | $3.55 | $12.0K | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Option exercise / conversion | 9,435 | — | — | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Shares withheld for taxes / exercise cost | 2,602 | $3.55 | $9.2K | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Option exercise / conversion | 7,250 | — | — | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Shares withheld for taxes / exercise cost | 1,850 | $3.55 | $6.6K | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Option exercise / conversion | 5,156 | — | — | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Shares withheld for taxes / exercise cost | 881 | $3.55 | $3.1K | Form 4 |
| 2026-05-18 | Barnett Valerie | Officer (CHIEF LEGAL OFFICER) | Option exercise / conversion | 2,454 | — | — | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion (derivative) | 10,699 | — | $0 | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion (derivative) | 8,700 | — | $0 | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion (derivative) | 6,320 | — | $0 | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Shares withheld for taxes / exercise cost | 3,839 | $3.55 | $13.6K | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion | 10,699 | — | — | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Shares withheld for taxes / exercise cost | 3,122 | $3.55 | $11.1K | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion | 8,700 | — | — | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Shares withheld for taxes / exercise cost | 2,268 | $3.55 | $8.1K | Form 4 |
| 2026-05-18 | McCombe William D. | Officer (Chief Financial Officer) | Option exercise / conversion | 6,320 | — | — | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion (derivative) | 38,141 | — | $0 | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion (derivative) | 19,334 | — | $0 | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion (derivative) | 14,733 | — | $0 | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion (derivative) | 7,854 | — | $0 | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Shares withheld for taxes / exercise cost | 15,009 | $3.55 | $53.3K | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion | 38,141 | — | — | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Shares withheld for taxes / exercise cost | 5,032 | $3.55 | $17.9K | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion | 19,334 | — | — | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Shares withheld for taxes / exercise cost | 3,588 | $3.55 | $12.7K | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion | 14,733 | — | — | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Shares withheld for taxes / exercise cost | 1,913 | $3.55 | $6.8K | Form 4 |
| 2026-05-18 | Jiang Wenbin | Director, Officer (PRESIDENT AND CEO) | Option exercise / conversion | 7,854 | — | — | Form 4 |
| 2026-05-18 | Busque Philippe | Officer (SVP, GLOBAL SALES AND SERVICES) | Option exercise / conversion (derivative) | 5,551 | — | $0 | Form 4 |
| 2026-05-18 | Busque Philippe | Officer (SVP, GLOBAL SALES AND SERVICES) | Option exercise / conversion (derivative) | 2,416 | — | $0 | Form 4 |
| 2026-05-18 | Busque Philippe | Officer (SVP, GLOBAL SALES AND SERVICES) | Option exercise / conversion (derivative) | 1,473 | — | $0 | Form 4 |
| 2026-05-18 | Busque Philippe | Officer (SVP, GLOBAL SALES AND SERVICES) | Option exercise / conversion (derivative) | 1,024 | — | $0 | Form 4 |
| 2026-05-18 | Busque Philippe | Officer (SVP, GLOBAL SALES AND SERVICES) | Shares withheld for taxes / exercise cost | 1,424 | $3.55 | $5.1K | Form 4 |
| 2026-05-18 | Busque Philippe | Officer (SVP, GLOBAL SALES AND SERVICES) | Option exercise / conversion | 5,551 | — | — | Form 4 |
| 2026-05-18 | Busque Philippe | Officer (SVP, GLOBAL SALES AND SERVICES) | Shares withheld for taxes / exercise cost | 620 | $3.55 | $2.2K | Form 4 |
Ask the chat about CTKB's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: CYTEK BIOSCIENCES INC (CTKB).
Last updated 2026-08-18 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.