Cytek (CTKB)
Builds Aurora spectral flow cytometers that profile 30-plus markers per sample on benchtop hardware.
$5.78
After hours+0.06 (+1.05%)
At close$5.72(+8.33%)
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13F · 13D/G · Form 4
| Institutions | 63.58% | 82.64M shares | |
|---|---|---|---|
| 156 holders · as of Jun 30, 2026 | |||
| Insiders | 10.48% | 13.63M shares | |
| 13 holders · as of Aug 20, 2026 | |||
| Other | 25.94% | 33.72M shares | |
| remainder | |||
129.98M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
13F, as of Jun 30, 2026
156 holders · 82.64M shares · 30 new positions · 74 increased · 65 reduced · 38 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 9.58M | 7.37% | −7.43M | Aug 7, 2026 |
| Millennium Management LLC | 9.34M | 7.18% | +3.05M | Aug 14, 2026 |
| Boston Partners | 7.66M | 5.89% | +1.86M | Aug 4, 2026 |
| HHLR Advisors, Ltd. | 6.66M | 5.12% | 0 | Aug 14, 2026 |
| Topline Capital Management, LLC | 6.28M | 4.83% | −781.0K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 4.94M | 3.80% | +176.7K | Aug 13, 2026 |
| Geode Capital Management, LLC | 3.06M | 2.35% | +225.6K | Aug 12, 2026 |
| Dimensional Fund Advisors LP | 2.62M | 2.01% | −47.1K | Aug 11, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 13.10% | 16.53M | 13G | Jul 18, 2025 |
| Boston Partners | 5.91% | 7.64M | 13G | Aug 4, 2026 |
| Integrated Core Strategies (US) LLC | 5.40% | 6.97M | 13G | May 18, 2026 |
| Topline Capital Management, LLC | 5.30% | 6.78M | 13G | Nov 17, 2025 |
| Millennium Management LLC | 5.20% | 6.64M | 13G | Apr 9, 2026 |
| Hillhouse Investment Management, Ltd. | 5.10% | 6.66M | 13G | Nov 14, 2024 |
Form 4
Latest trades
No open-market trades in the last 12 months.
House and Senate disclosures
Not reported.