CTKB · Insider Trading
Cytek Biosciences, Inc. Common Stock
Every open-market purchase and sale reported by CTKB officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-20 | Michael Holder | Director | M | +2,181 | — |
| 2026-08-20 | Glenn P Muir | Director | M | +3,086 | — |
| 2026-08-20 | William D. McCombe | Chief Financial Officer | MIXED | +23,516 | −$55.59K |
| 2026-08-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | +25,182 | −$37.77K |
| 2026-08-20 | Richard Chin | Director | M | +6,107 | — |
| 2026-08-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | +83,826 | −$169.38K |
| 2026-08-12 | Ilan Feuchtwang | Chief Legal Officer, Secretary | A | +368,534 deriv. | — |
| 2026-06-16 | Ming Yan | CHIEF TECHNOLOGY OFFICER | G | −135,892 | — |
| 2026-06-12 | Michael Holder | Director | M | +43,973 | — |
| 2026-06-12 | Vera Imper | Director | M | +43,973 | — |
| 2026-06-12 | Jack Ball | Director | M | +43,973 | — |
| 2026-06-12 | Deborah J Neff | Director | M | +43,973 | — |
| 2026-06-12 | Richard Chin | Director | A | +51,594 deriv. | — |
| 2026-06-12 | Glenn P Muir | Director | A | +85,390 deriv. | — |
| 2026-05-20 | Richard Chin | Director | M | +6,107 | — |
| 2026-05-20 | Michael Holder | Director | M | +1,454 | — |
| 2026-05-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | +16,647 | −$19.64K |
| 2026-05-20 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | +15,576 | −$30.95K |
| 2026-05-20 | Philippe Busque | SVP, GLOBAL SALES AND SERVICES | MIXED | +7,779 | −$9.53K |
| 2026-05-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | +54,520 | −$90.67K |
| 2026-05-20 | William D. McCombe | Chief Financial Officer | MIXED | +16,490 | −$32.76K |
| 2026-03-13 | Ming Yan | CHIEF TECHNOLOGY OFFICER | G | −1,176,000 | — |
| 2026-03-12 | Michael Holder | Director | M | +2,908 | — |
| 2026-03-12 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | +62,856 | −$88.78K |
| 2026-03-12 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | +17,669 | −$32.70K |
| 2026-03-12 | William D. McCombe | Chief Financial Officer | MIXED | +13,973 | −$41.23K |
| 2026-03-12 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | +17,974 | −$49.69K |
| 2026-03-12 | Philippe Busque | SVP, GLOBAL SALES AND SERVICES | MIXED | +6,785 | −$12.87K |
| 2026-03-12 | Richard Chin | Director | M | +6,107 | — |
| 2026-02-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | +3,175 | −$5.62K |
| 2026-02-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | +937 | −$1.66K |
| 2026-02-20 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | +821 | −$2.21K |
| 2025-11-20 | William D. McCombe | Chief Financial Officer | MIXED | +13,143 | −$34.44K |
| 2025-11-20 | Michael Holder | Director | M | +2,181 | — |
| 2025-11-20 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | +16,490 | −$43.23K |
| 2025-11-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | +42,235 | −$151.56K |
| 2025-11-20 | Richard Chin | Director | M | +6,107 | — |
| 2025-11-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | +15,908 | −$28.33K |
| 2025-11-20 | Philippe Busque | SVP, GLOBAL SALES AND SERVICES | MIXED | +5,486 | −$10.42K |
| 2025-08-20 | Michael Holder | Director | M | +2,181 | — |
| 2025-08-20 | Richard Chin | Director | M | +4,071 | — |
| 2025-08-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | +15,293 | −$23.30K |
| 2025-08-20 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | +15,478 | −$35.85K |
| 2025-08-20 | William D. McCombe | Chief Financial Officer | MIXED | +11,825 | −$30.64K |
| 2025-08-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | +52,682 | −$68.85K |
| 2025-08-20 | Philippe Busque | SVP, GLOBAL SALES AND SERVICES | MIXED | +4,499 | −$11.66K |
| 2025-06-20 | Vera Imper | Director | A | +67,782 deriv. | — |
| 2025-06-20 | Richard Chin | Director | A | +112,351 deriv. | — |
| 2025-06-20 | Deborah J Neff | Director | A | +67,782 deriv. | — |
| 2025-06-20 | Michael Holder | Director | A | +67,782 deriv. | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Wenbin Jiang | PRESIDENT AND CEO | 8,191,373 | $48.25M |
| Ming Yan | CHIEF TECHNOLOGY OFFICER | 4,806,452 | $28.31M |
| Valerie Barnett | CHIEF LEGAL OFFICER | 153,398 | $903.51K |
| William D. McCombe | Chief Financial Officer | 115,386 | $679.62K |
| Jack Ball | Director | 86,678 | $510.53K |
| Michael Holder | Director | 62,875 | $370.33K |
| Deborah J Neff | Director | 59,679 | $351.51K |
| Vera Imper | Director | 59,679 | $351.51K |
| Allen Poirson | SVP BUS. AND CORP. DEV. | 57,615 | $339.35K |
| Philippe Busque | SVP, GLOBAL SALES AND SERVICES | 39,339 | $231.71K |
| Richard Chin | Director | 28,499 | $167.86K |
| Don M Hardison | Director | 15,706 | $92.51K |
| Glenn P Muir | Director | 3,086 | $18.18K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the CTKB quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.