🕵️ Cytek Biosciences, Inc. ($CTKB)
SEC insider & ownership activity, last 12 months · CIK 1831915 · every row links its SEC filing
Insiders were quiet over the last 12 months – no open-market buys or sells. 1 planned sale is pending, the largest $147K (Philippe Busque). No red-flag 8-Ks in the window.
Insider flow
0 buyers, $0 (0 lots) · 0 sellers, $0 (0 lots)
No open-market insider transactions in the last 12 months.
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| BlackRock, Inc. | 7.2% | 13G | Jul 8, 2026 | filing ↗ | |
| Millennium Management LLC | 7.2% | 13G | Aug 6, 2026 | filing ↗ | |
| Millennium Group Management LLC | 7.2% | 13G | Aug 6, 2026 | filing ↗ | |
| Israel A. Englander | 7.2% | 13G | Aug 6, 2026 | filing ↗ | |
| Boston Partners | 5.9% | 13G | Aug 4, 2026 | filing ↗ | |
| Integrated CORE Strategies (US) LLC | 5.5% | 13G | Aug 6, 2026 | filing ↗ | |
| Topline Capital Management, LLC | 5.3% | 13G | Nov 17, 2025 | filing ↗ | |
| Collin McBirney | 5.3% | 13G | Nov 17, 2025 | filing ↗ | |
| Topline Capital Partners, LP | 5.3% | 13G | Nov 17, 2025 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Philippe Busque | $147K | Sep 2, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Reg FD disclosure (7.01) | Aug 21, 2026 | filing ↗ |
| Other events (8.01) | Aug 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 21, 2026 | filing ↗ |
| Earnings (2.02) | Aug 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 5, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jul 9, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 18, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 10, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 27, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Earnings (2.02) | Feb 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 26, 2026 | filing ↗ |
| Earnings (2.02) | Jan 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 12, 2026 | filing ↗ |
| Earnings (2.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |