CTKB insider trading — Cytek Biosciences, Inc.
No open-market insider purchases or sales were filed for Cytek Biosciences, Inc. (CTKB) in the last 90 days. Other insider transactions — such as stock awards, option exercises or tax withholding — are listed below.
Updated Oct 16, 2026.
Recent CTKB insider transactions
Every Form 4 filed by Cytek Biosciences, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | M · Option exercise | Direct | 120,095 | — | — | Form 4 |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | F · Tax withholding | Direct | 36,269 | $4.67 | $169K | Form 4 |
| Aug 18, 2026 | Mccombe William D. | Chief Financial Officer | M · Option exercise | Direct | 35,420 | — | — | Form 4 |
| Aug 18, 2026 | Mccombe William D. | Chief Financial Officer | F · Tax withholding | Direct | 11,904 | $4.67 | $56K | Form 4 |
| Aug 18, 2026 | Muir Glenn P | Director | M · Option exercise | Direct | 3,086 | — | — | Form 4 |
| Aug 18, 2026 | Holder Michael | Director | M · Option exercise | Direct | 2,181 | — | — | Form 4 |
| Aug 18, 2026 | Chin Richard | Director | M · Option exercise | Direct | 6,107 | — | — | Form 4 |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | M · Option exercise | Direct | 33,270 | — | — | Form 4 |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | F · Tax withholding | Direct | 8,088 | $4.67 | $38K | Form 4 |
CTKB insider trading FAQ
Are insiders buying CTKB stock?
Not on the open market. In the last 90 days, Cytek Biosciences, Inc. insiders made no open-market purchases, and no open-market sales. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading CTKB?
No insider bought or sold on the open market in the last 90 days.
Where does CTKB insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.