CTKB
Cytek Biosciences Inc
NASDAQ: CTKB · HEALTHCARE · MEDICAL DEVICES
$4.31
-1.60% today
Updated 2026-07-30
Market cap
$588.89M
P/E ratio
—
P/S ratio
2.88x
EPS (TTM)
$-0.58
Dividend yield
—
52W range
$3 – $6
Volume
1.4M
Cytek Biosciences Inc (CTKB) Insider transactions
Net insider activity
Net selling (348,094 shares)
Buy transactions
44
Sell transactions
56
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-12 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 135,892 | — | — |
| 2026-06-10 | NEFF, DEBORAH J | Director | Sale | 43,973 | — | — |
| 2026-06-10 | NEFF, DEBORAH J | Director | Buy | 33,333 | — | — |
| 2026-06-10 | NEFF, DEBORAH J | Director | Buy | 18,261 | — | — |
| 2026-06-10 | NEFF, DEBORAH J | Director | Buy | 43,973 | — | — |
| 2026-06-10 | MUIR, GLENN P | Director | Buy | 55,555 | — | — |
| 2026-06-10 | MUIR, GLENN P | Director | Buy | 29,835 | — | — |
| 2026-06-10 | IMPER, VERA | Director | Sale | 43,973 | — | — |
| 2026-06-10 | IMPER, VERA | Director | Buy | 33,333 | — | — |
| 2026-06-10 | IMPER, VERA | Director | Buy | 18,261 | — | — |
| 2026-06-10 | IMPER, VERA | Director | Buy | 43,973 | — | — |
| 2026-06-10 | HOLDER, MICHAEL | Director | Sale | 43,973 | — | — |
| 2026-06-10 | HOLDER, MICHAEL | Director | Buy | 33,333 | — | — |
| 2026-06-10 | HOLDER, MICHAEL | Director | Buy | 18,261 | — | — |
| 2026-06-10 | HOLDER, MICHAEL | Director | Buy | 43,973 | — | — |
| 2026-06-10 | CHIN, RICHARD | Director | Buy | 33,333 | — | — |
| 2026-06-10 | CHIN, RICHARD | Director | Buy | 18,261 | — | — |
| 2026-06-10 | BALL, JACK | Director | Sale | 43,973 | — | — |
| 2026-06-10 | BALL, JACK | Director | Buy | 43,973 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 9,480 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 4,908 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 4,108 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 3,683 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 9,480 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 4,908 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 4,108 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 3,683 | — | — |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 2,364 | $3.55 | $8392.20 |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 1,224 | $3.55 | $4345.20 |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 1,025 | $3.55 | $3638.75 |
| 2026-05-18 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 919 | $3.55 | $3262.45 |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 10,699 | — | — |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 8,700 | — | — |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 6,320 | — | — |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Buy | 10,699 | — | — |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Buy | 8,700 | — | — |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Buy | 6,320 | — | — |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 3,839 | $3.55 | $13628.45 |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 3,122 | $3.55 | $11083.10 |
| 2026-05-18 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 2,268 | $3.55 | $8051.40 |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Sale | 38,141 | — | — |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Sale | 19,334 | — | — |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Sale | 14,733 | — | — |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Sale | 7,854 | — | — |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Buy | 38,141 | — | — |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Buy | 19,334 | — | — |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Sale | 15,009 | $3.55 | $53281.95 |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Buy | 14,733 | — | — |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Buy | 7,854 | — | — |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Sale | 5,032 | $3.55 | $17863.60 |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Sale | 3,588 | $3.55 | $12737.40 |
| 2026-05-18 | JIANG, WENBIN | Director, PRESIDENT AND CEO | Sale | 1,913 | $3.55 | $6791.15 |
| 2026-05-18 | HOLDER, MICHAEL | Director | Sale | 1,454 | — | — |
| 2026-05-18 | HOLDER, MICHAEL | Director | Buy | 1,454 | — | — |
| 2026-05-18 | CHIN, RICHARD | Director | Sale | 6,107 | — | — |
| 2026-05-18 | CHIN, RICHARD | Director | Buy | 6,107 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Sale | 5,551 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Sale | 2,416 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Sale | 1,473 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Sale | 1,024 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Buy | 5,551 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Buy | 2,416 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Buy | 1,473 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Sale | 1,424 | $3.55 | $5055.20 |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Buy | 1,024 | — | — |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Sale | 620 | $3.55 | $2201.00 |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Sale | 378 | $3.55 | $1341.90 |
| 2026-05-18 | BUSQUE, PHILIPPE | SVP, GLOBAL SALES AND SERVICES | Sale | 263 | $3.55 | $933.65 |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Sale | 9,435 | — | — |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Sale | 7,250 | — | — |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Sale | 5,156 | — | — |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Sale | 2,454 | — | — |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Buy | 9,435 | — | — |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Buy | 7,250 | — | — |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Buy | 5,156 | — | — |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Sale | 3,386 | $3.55 | $12020.30 |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Sale | 2,602 | $3.55 | $9237.10 |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Buy | 2,454 | — | — |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Sale | 1,850 | $3.55 | $6567.50 |
| 2026-05-18 | BARNETT, VALERIE | CHIEF LEGAL OFFICER | Sale | 881 | $3.55 | $3127.55 |
| 2026-03-13 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 1,176,000 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 227,535 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 9,817 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 8,217 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 7,366 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 120,688 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 9,817 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 8,217 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Buy | 7,366 | — | — |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 3,047 | $4.23 | $12888.81 |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 2,397 | $4.23 | $10139.31 |
| 2026-03-10 | YAN, MING | Director, CHIEF TECHNOLOGY OFFICER | Sale | 2,287 | $4.23 | $9674.01 |
| 2026-03-10 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Buy | 256,790 | — | — |
| 2026-03-10 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 17,401 | — | — |
| 2026-03-10 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 6,320 | — | — |
| 2026-03-10 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Buy | 136,205 | — | — |
| 2026-03-10 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Buy | 17,401 | — | — |
| 2026-03-10 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 7,145 | $4.23 | $30223.35 |
| 2026-03-10 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Buy | 6,320 | — | — |
| 2026-03-10 | MCCOMBE, WILLIAM D. | Chief Financial Officer | Sale | 2,603 | $4.23 | $11010.69 |
Frequently asked questions
Are CTKB insiders buying or selling?
Over the transactions on record, CTKB insiders have been net sellers, with about $257496.02 in stock sold across 56 sales. The entries tagged as buys are stock grants and option exercises recorded at $0, not open-market purchases.
Does insider selling at CTKB mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which CTKB insiders are selling the most?
Recent selling is concentrated in a few names. JIANG, WENBIN accounts for the largest share on record, with about $90674.10 sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.