Who owns Cytek Biosciences, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of CTKB from SEC Form 13F filings across 154 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 154 institutions disclosed 81.5M shares of Cytek Biosciences, Inc. worth $361.0M — about 63% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
154
13F holders
$361.0M
value, 2026 filers
63%
of shares outstanding (81.5M sh)
28
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of CTKB's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 9.6M | $42.4M | 0.0% | 7.4% | -43.7% |
| 2 | MILLENNIUM MANAGEMENT LLC | 9.3M | $41.4M | 0.0% | 7.2% | +48.4% |
| 3 | Boston Partners | 7.7M | $33.9M | 0.0% | 5.9% | +32.0% |
| 4 | HHLR ADVISORS, LTD. | 6.7M | $29.5M | 3.5% | 5.1% | 0.0% |
| 5 | Topline Capital Management, LLC | 6.3M | $27.8M | 7.2% | 4.9% | -11.1% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 4.9M | $21.9M | 0.0% | 3.8% | +3.7% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 3.1M | $13.6M | 0.0% | 2.4% | +8.0% |
| 8 | DIMENSIONAL FUND ADVISORS LP | 2.6M | $11.6M | 0.0% | 2% | -1.8% |
| 9 | STATE STREET CORP | 2.6M | $11.4M | 0.0% | 2% | -37.8% |
| 10 | GOLDMAN SACHS GROUP INC | 2.2M | $9.6M | 0.0% | 1.7% | -7.6% |
| 11 | ROYCE & ASSOCIATES LP | 2.1M | $9.2M | 0.1% | 1.6% | +26.7% |
| 12 | Russell Investments Group, Ltd. | 1.5M | $6.7M | 0.0% | 1.2% | +11.1% |
| 13 | ACADIAN ASSET MANAGEMENT LLC | 1.4M | $6.1M | 0.0% | 1.1% | +244.9% |
| 14 | BANK OF AMERICA CORP /DE/ | 1.3M | $5.8M | 0.0% | 1% | +30.4% |
| 15 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.1M | $5.1M | 0.0% | 0.9% | -50.6% |
| 16 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1M | $4.8M | 0.0% | 0.8% | -2.8% |
| 17 | NORTHERN TRUST CORP | 1.0M | $4.4M | 0.0% | 0.8% | -0.2% |
| 18 | HRT FINANCIAL LP | 997,769 | $4.4M | 0.0% | 0.8% | +141.0% |
| 19 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 973,833 | $4.3M | 0.0% | 0.8% | +204.4% |
| 20 | JANE STREET GROUP, LLCNEW | 906,162 | $4.0M | 0.0% | 0.7% | new |
| 21 | TUDOR INVESTMENT CORP ET AL | 837,913 | $3.7M | 0.0% | 0.6% | +161.3% |
| 22 | AQR CAPITAL MANAGEMENT LLC | 813,971 | $3.6M | 0.0% | 0.6% | -10.8% |
| 23 | VANGUARD FIDUCIARY TRUST CO | 740,662 | $3.3M | 0.0% | 0.6% | +3.3% |
| 24 | CITADEL ADVISORS LLC | 721,470 | $3.2M | 0.0% | 0.6% | +53.1% |
| 25 | MORGAN STANLEY | 701,792 | $3.1M | 0.0% | 0.5% | -59.2% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.