Cytek Biosciences Inc
Ownership
Ownership Structure
Who owns Cytek Biosciences Inc (CTKB)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 79.2% of the shares are freely tradable; institutional investors hold 67.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 13.08 | 17,007,269 | -1.0 | 03/31/2026 |
| Millennium Management LLC | 7.18 | 9,338,010 | +48.4 | 06/30/2026 |
| Boston Partners Global Investors, Inc | 5.89 | 7,660,943 | +32.0 | 06/30/2026 |
| Hillhouse Capital Advisors, Ltd. | 5.12 | 6,657,030 | +0.0 | 06/30/2026 |
| Topline Capital Management LLC | 4.83 | 6,283,450 | -11.1 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.66 | 4,762,904 | +0.0 | 03/31/2026 |
| State Street Corp | 3.17 | 4,123,748 | -0.6 | 03/31/2026 |
| Geode Capital Management, LLC | 2.18 | 2,833,955 | +1.6 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.71 | 3,525,848 | +0.0 | 07/31/2026 |
| iShares Russell 2000 ETF | 2.40 | 3,117,124 | -0.6 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Jiang Wenbin | PRESIDENT AND CEO | 5,561,029 | 28,917,351 $ | Aug 18, 2026 | direct |
| Yan Ming | CHIEF TECHNOLOGY OFFICER | 4,821,870 | 25,073,724 $ | Aug 18, 2026 | direct |
| McCombe William D. | Chief Financial Officer | 134,693 | 700,404 $ | Aug 18, 2026 | direct |
| Holder Michael | Director | 62,875 | 326,950 $ | Aug 18, 2026 | direct |
| Chin Richard | Director | 28,499 | 148,195 $ | Aug 18, 2026 | direct |
| Muir Glenn P | Director | 3,086 | 16,047 $ | Aug 18, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 18, 2026 | McCombe William D. | Chief Financial Officer | Other | 5,401 | 4.67 | 25,223 |
| Aug 18, 2026 | McCombe William D. | Chief Financial Officer | Other | 16,049 | – | – |
| Aug 18, 2026 | McCombe William D. | Chief Financial Officer | Other | 4,392 | 4.67 | 20,511 |
| Aug 18, 2026 | McCombe William D. | Chief Financial Officer | Other | 13,051 | – | – |
| Aug 18, 2026 | McCombe William D. | Chief Financial Officer | Other | 2,111 | 4.67 | 9,858 |
| Aug 18, 2026 | McCombe William D. | Chief Financial Officer | Other | 6,320 | – | – |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | Other | 3,463 | 4.67 | 16,172 |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | Other | 14,220 | – | – |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | Other | 1,501 | 4.67 | 7,010 |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | Other | 6,162 | – | – |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | Other | 1,346 | 4.67 | 6,286 |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | Other | 5,525 | – | – |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | Other | 1,778 | 4.67 | 8,303 |
| Aug 18, 2026 | Yan Ming | CHIEF TECHNOLOGY OFFICER | Other | 7,363 | – | – |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | Other | 20,956 | 4.67 | 97,865 |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | Other | 57,212 | – | – |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | Other | 7,062 | 4.67 | 32,980 |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | Other | 29,002 | – | – |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | Other | 5,382 | 4.67 | 25,134 |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | Other | 22,100 | – | – |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | Other | 2,869 | 4.67 | 13,398 |
| Aug 18, 2026 | Jiang Wenbin | PRESIDENT AND CEO | Other | 11,781 | – | – |
| Aug 18, 2026 | Holder Michael | Director | Other | 2,181 | – | – |
| Aug 18, 2026 | Chin Richard | Director | Other | 6,107 | – | – |
| Aug 18, 2026 | Muir Glenn P | Director | Other | 3,086 | – | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.