As of the latest Form 4 filed Jun 16, 2026.
What Cytek Biosciences Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Newest filing first — the 82 most recent filings for CTKB.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-16 | 2026-06-12 | Yan Ming CHIEF TECHNOLOGY OFFICER | GGift | −136K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Imper Vera Director | MExercise | +44.0K | — | — | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Ball Jack Director | MExercise | +44.0K | — | — | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Holder Michael Director | MExercise | +44.0K | — | — | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | NEFF DEBORAH J Director | MExercise | +44.0K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Busque Philippe SVP, GLOBAL SALES AND SERVICES | FTax | −1.42K | $3.55 | $5.06K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | MExercise | +5.55K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | FTax | −620.00 | $3.55 | $2.20K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | MExercise | +2.42K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | FTax | −378.00 | $3.55 | $1.34K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | MExercise | +1.47K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | FTax | −263.00 | $3.55 | $933.65 | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | MExercise | +1.02K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | McCombe William D. Chief Financial Officer | FTax | −3.84K | $3.55 | $13.6K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | McCombe William D., Chief Financial Officer | MExercise | +10.7K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | McCombe William D., Chief Financial Officer | FTax | −3.12K | $3.55 | $11.1K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | McCombe William D., Chief Financial Officer | MExercise | +8.70K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | McCombe William D., Chief Financial Officer | FTax | −2.27K | $3.55 | $8.05K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | McCombe William D., Chief Financial Officer | MExercise | +6.32K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Yan Ming CHIEF TECHNOLOGY OFFICER | FTax | −2.36K | $3.55 | $8.39K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Yan Ming, CHIEF TECHNOLOGY OFFICER | MExercise | +9.48K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Yan Ming, CHIEF TECHNOLOGY OFFICER | FTax | −1.02K | $3.55 | $3.64K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Yan Ming, CHIEF TECHNOLOGY OFFICER | MExercise | +4.11K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Yan Ming, CHIEF TECHNOLOGY OFFICER | FTax | −919.00 | $3.55 | $3.26K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Yan Ming, CHIEF TECHNOLOGY OFFICER | MExercise | +3.68K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Yan Ming, CHIEF TECHNOLOGY OFFICER | FTax | −1.22K | $3.55 | $4.35K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Yan Ming, CHIEF TECHNOLOGY OFFICER | MExercise | +4.91K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Barnett Valerie CHIEF LEGAL OFFICER | FTax | −3.39K | $3.55 | $12.0K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Barnett Valerie, CHIEF LEGAL OFFICER | MExercise | +9.44K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Barnett Valerie, CHIEF LEGAL OFFICER | FTax | −2.60K | $3.55 | $9.24K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Barnett Valerie, CHIEF LEGAL OFFICER | MExercise | +7.25K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Barnett Valerie, CHIEF LEGAL OFFICER | FTax | −1.85K | $3.55 | $6.57K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Barnett Valerie, CHIEF LEGAL OFFICER | MExercise | +5.16K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Barnett Valerie, CHIEF LEGAL OFFICER | FTax | −881.00 | $3.55 | $3.13K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Barnett Valerie, CHIEF LEGAL OFFICER | MExercise | +2.45K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Jiang Wenbin PRESIDENT AND CEO | FTax | −15.0K | $3.55 | $53.3K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Jiang Wenbin, PRESIDENT AND CEO | MExercise | +38.1K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Jiang Wenbin, PRESIDENT AND CEO | FTax | −5.03K | $3.55 | $17.9K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Jiang Wenbin, PRESIDENT AND CEO | MExercise | +19.3K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Jiang Wenbin, PRESIDENT AND CEO | FTax | −3.59K | $3.55 | $12.7K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Jiang Wenbin, PRESIDENT AND CEO | MExercise | +14.7K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Jiang Wenbin, PRESIDENT AND CEO | FTax | −1.91K | $3.55 | $6.79K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Jiang Wenbin, PRESIDENT AND CEO | MExercise | +7.85K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Holder Michael Director | MExercise | +1.45K | — | — | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Chin Richard Director | MExercise | +6.11K | — | — | No | Form 4 ↗ |
| 2026-03-13 | 2026-03-13 | Yan Ming CHIEF TECHNOLOGY OFFICER | GGift | −1.18M | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Busque Philippe SVP, GLOBAL SALES AND SERVICES | FTax | −1.50K | $4.23 | $6.33K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | MExercise | +4.83K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | FTax | −912.00 | $4.23 | $3.86K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | MExercise | +2.95K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | FTax | −635.00 | $4.23 | $2.69K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Busque Philippe, SVP, GLOBAL SALES AND SERVICES | MExercise | +2.05K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | McCombe William D. Chief Financial Officer | FTax | −7.14K | $4.23 | $30.2K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | McCombe William D., Chief Financial Officer | MExercise | +17.4K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | McCombe William D., Chief Financial Officer | FTax | −2.60K | $4.23 | $11.0K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | McCombe William D., Chief Financial Officer | MExercise | +6.32K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Yan Ming CHIEF TECHNOLOGY OFFICER | FTax | −2.40K | $4.23 | $10.1K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Yan Ming, CHIEF TECHNOLOGY OFFICER | MExercise | +8.22K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Yan Ming, CHIEF TECHNOLOGY OFFICER | FTax | −2.29K | $4.23 | $9.67K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Yan Ming, CHIEF TECHNOLOGY OFFICER | MExercise | +7.37K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Yan Ming, CHIEF TECHNOLOGY OFFICER | FTax | −3.05K | $4.23 | $12.9K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Yan Ming, CHIEF TECHNOLOGY OFFICER | MExercise | +9.82K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Barnett Valerie CHIEF LEGAL OFFICER | FTax | −5.74K | $4.23 | $24.3K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Barnett Valerie, CHIEF LEGAL OFFICER | MExercise | +14.5K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Barnett Valerie, CHIEF LEGAL OFFICER | FTax | −4.25K | $4.23 | $18.0K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Barnett Valerie, CHIEF LEGAL OFFICER | MExercise | +10.3K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Barnett Valerie, CHIEF LEGAL OFFICER | FTax | −1.76K | $4.23 | $7.45K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Barnett Valerie, CHIEF LEGAL OFFICER | MExercise | +4.91K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Jiang Wenbin PRESIDENT AND CEO | FTax | −9.42K | $4.23 | $39.8K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Jiang Wenbin, PRESIDENT AND CEO | MExercise | +38.7K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Jiang Wenbin, PRESIDENT AND CEO | FTax | −7.75K | $4.23 | $32.8K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Jiang Wenbin, PRESIDENT AND CEO | MExercise | +29.5K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Jiang Wenbin, PRESIDENT AND CEO | FTax | −3.83K | $4.23 | $16.2K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Jiang Wenbin, PRESIDENT AND CEO | MExercise | +15.7K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Holder Michael Director | MExercise | +2.91K | — | — | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Chin Richard Director | MExercise | +6.11K | — | — | No | Form 4 ↗ |
| 2026-02-20 | 2026-02-18 | Yan Ming CHIEF TECHNOLOGY OFFICER | FTax | −395.00 | $4.20 | $1.66K | No | Form 4 ↗ |
| 2026-02-20 | 2026-02-18 | Yan Ming, CHIEF TECHNOLOGY OFFICER | MExercise | +1.33K | — | — | No | Form 4 ↗ |
| 2026-02-20 | 2026-02-18 | Barnett Valerie CHIEF LEGAL OFFICER | FTax | −525.00 | $4.20 | $2.21K | No | Form 4 ↗ |
| 2026-02-20 | 2026-02-18 | Barnett Valerie, CHIEF LEGAL OFFICER | MExercise | +1.35K | — | — | No | Form 4 ↗ |
| 2026-02-20 | 2026-02-18 | Jiang Wenbin PRESIDENT AND CEO | FTax | −1.34K | $4.20 | $5.62K | No | Form 4 ↗ |
| 2026-02-20 | 2026-02-18 | Jiang Wenbin, PRESIDENT AND CEO | MExercise | +4.51K | — | — | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also CTKB’s full analysis or the market-wide insider trading feed. The tabs above jump to CTKB’s other SEC data.
Source: SEC Form 4 filings for CTKB, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.