Cytek Biosciences, Inc. (CTKB) ownership: Top institutional holder: BlackRock, Inc. ($74.32M). Insider activity: Net Seller (1 buys, 19 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 17007269.00 | $74.32M | 2026-03-31 |
| VANGUARD GROUP INC | 7475477.00 | $37.75M | 2025-12-31 |
| Topline Capital Management, LLC | 7064481.00 | $30.87M | 2026-03-31 |
| HHLR ADVISORS, LTD. | 6657030.00 | $29.09M | 2026-03-31 |
| MILLENNIUM MANAGEMENT LLC | 6291798.00 | $27.50M | 2026-03-31 |
| Boston Partners | 5802773.00 | $25.36M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4762904.00 | $20.81M | 2026-03-31 |
| STATE STREET CORP | 4123748.00 | $18.02M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-10 | |
| Sell | null | 2026-06-10 | |
| Sell | null | 2026-06-10 | |
| Sell | null | 2026-06-10 | |
| Sell | null | 2026-06-10 | |
| Sell | null | 2026-06-10 | |
| Sell | null | 2026-06-10 | |
| Sell | null | 2026-06-10 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.