CTKB (Cytek Biosciences, Inc. Common Stock)
Insider Trading Activity
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.
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-20 | Michael Holder | Director | M | — | — |
| 2026-08-20 | GLENN P MUIR | Director | M | — | — |
| 2026-08-20 | William D. McCombe | Chief Financial Officer | MIXED | — | — |
| 2026-08-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | — | — |
| 2026-08-20 | Richard Chin | Director | M | — | — |
| 2026-08-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | — | — |
| 2026-08-12 | Ilan Feuchtwang | Chief Legal Officer, Secretary | A | — | — |
| 2026-06-16 | Ming Yan | CHIEF TECHNOLOGY OFFICER | G | — | — |
| 2026-06-12 | Michael Holder | Director | M | — | — |
| 2026-06-12 | Vera Imper | Director | M | — | — |
| 2026-06-12 | Jack Ball | Director | M | — | — |
| 2026-06-12 | DEBORAH J NEFF | Director | M | — | — |
| 2026-06-12 | Richard Chin | Director | A | — | — |
| 2026-06-12 | GLENN P MUIR | Director | A | — | — |
| 2026-05-20 | Richard Chin | Director | M | — | — |
| 2026-05-20 | Michael Holder | Director | M | — | — |
| 2026-05-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | — | — |
| 2026-05-20 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | — | — |
| 2026-05-20 | Philippe Busque | SVP, GLOBAL SALES AND SERVICES | MIXED | — | — |
| 2026-05-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | — | — |
| 2026-05-20 | William D. McCombe | Chief Financial Officer | MIXED | — | — |
| 2026-03-13 | Ming Yan | CHIEF TECHNOLOGY OFFICER | G | — | — |
| 2026-03-12 | Michael Holder | Director | M | — | — |
| 2026-03-12 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | — | — |
| 2026-03-12 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | — | — |
| 2026-03-12 | William D. McCombe | Chief Financial Officer | MIXED | — | — |
| 2026-03-12 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | — | — |
| 2026-03-12 | Philippe Busque | SVP, GLOBAL SALES AND SERVICES | MIXED | — | — |
| 2026-03-12 | Richard Chin | Director | M | — | — |
| 2026-02-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | — | — |
| 2026-02-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | — | — |
| 2026-02-20 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | — | — |
| 2025-11-20 | William D. McCombe | Chief Financial Officer | MIXED | — | — |
| 2025-11-20 | Michael Holder | Director | M | — | — |
| 2025-11-20 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | — | — |
| 2025-11-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | — | — |
| 2025-11-20 | Richard Chin | Director | M | — | — |
| 2025-11-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | — | — |
| 2025-11-20 | Philippe Busque | SVP, GLOBAL SALES AND SERVICES | MIXED | — | — |
| 2025-08-20 | Michael Holder | Director | M | — | — |
| 2025-08-20 | Richard Chin | Director | M | — | — |
| 2025-08-20 | Ming Yan | CHIEF TECHNOLOGY OFFICER | MIXED | — | — |
| 2025-08-20 | Valerie Barnett | CHIEF LEGAL OFFICER | MIXED | — | — |
| 2025-08-20 | William D. McCombe | Chief Financial Officer | MIXED | — | — |
| 2025-08-20 | Wenbin Jiang | PRESIDENT AND CEO | MIXED | — | — |
| 2025-08-20 | Philippe Busque | SVP, GLOBAL SALES AND SERVICES | MIXED | — | — |
| 2025-06-20 | Vera Imper | Director | A | — | — |
| 2025-06-20 | Richard Chin | Director | A | — | — |
| 2025-06-20 | DEBORAH J NEFF | Director | A | — | — |
| 2025-06-20 | Michael Holder | Director | A | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | Director | 13,139,327 | — |
| — | Director | 12,459,692 | — |
| — | Director | 11,054,426 | — |
| — | PRESIDENT AND CEO | 8,191,373 | — |
| — | CHIEF TECHNOLOGY OFFICER | 4,806,452 | — |
| — | CHIEF LEGAL OFFICER | 153,398 | — |
| — | Director | 147,933 | — |
| — | Chief Financial Officer | 115,386 | — |
| — | CHIEF FINANCIAL OFFICER | 97,465 | — |
| — | Director | 86,678 | — |
| — | Director | 62,875 | — |
| — | Director | 59,679 | — |
| — | Director | 59,679 | — |
| — | SVP BUS. AND CORP. DEV. | 57,615 | — |
| — | SVP, GLOBAL SALES AND SERVICES | 39,339 | — |
| — | Director | 28,499 | — |
| — | Director | 15,706 | — |
| — | CHIEF OPERATING OFFICER | 11,077 | — |
| — | Chief Commercial Officer | 7,078 | — |
| — | Director | 5,000 | — |
| — | Director | 3,086 | — |
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.