CTKB Cytek Biosciences, Inc.
Cytek Biosciences, Inc. (CTKB) Institutional Ownership
What the institutions did with CTKB last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 9.6M | 11.8% |
| MILLENNIUM MANAGEMENT LLC | 9.3M | 11.5% |
| Boston Partners | 7.7M | 9.4% |
| HHLR ADVISORS, LTD. | 6.7M | 8.2% |
| Topline Capital Management, LLC | 6.3M | 7.7% |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.9M | 6.1% |
| GEODE CAPITAL MANAGEMENT, LLC | 3.1M | 3.8% |
| DIMENSIONAL FUND ADVISORS LP | 2.6M | 3.2% |
| STATE STREET CORP | 2.6M | 3.1% |
| GOLDMAN SACHS GROUP INC | 2.2M | 2.7% |
| ROYCE & ASSOCIATES LP | 2.1M | 2.6% |
| Russell Investments Group, Ltd. | 1.5M | 1.9% |
| ACADIAN ASSET MANAGEMENT LLC | 1.4M | 1.7% |
| BANK OF AMERICA CORP /DE/ | 1.3M | 1.6% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1.1M | 1.4% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1M | 1.3% |
| NORTHERN TRUST CORP | 1.0M | 1.2% |
| HRT FINANCIAL LP | 997.8K | 1.2% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 973.8K | 1.2% |
| JANE STREET GROUP, LLC | 906.2K | 1.1% |
| TUDOR INVESTMENT CORP ET AL | 837.9K | 1.0% |
| AQR CAPITAL MANAGEMENT LLC | 814.0K | 1.0% |
| VANGUARD FIDUCIARY TRUST CO | 740.7K | 0.9% |
| CITADEL ADVISORS LLC | 721.5K | 0.9% |
| MORGAN STANLEY | 701.8K | 0.9% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| BlackRock, Inc. | Reduced | 17.0M | 9.6M | -7.4M |
| MILLENNIUM MANAGEMENT LLC | Increased | 6.3M | 9.3M | +3.0M |
| Boston Partners | Increased | 5.8M | 7.7M | +1.9M |
| STATE STREET CORP | Reduced | 4.1M | 2.6M | -1.6M |
| BROWN CAPITAL MANAGEMENT LLC | Sold Out | 1.5M | 0 | -1.5M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 2.3M | 1.1M | -1.2M |
| MORGAN STANLEY | Reduced | 1.7M | 701.8K | -1.0M |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 399.0K | 1.4M | +977.1K |
| JANE STREET GROUP, LLC | New | 0 | 906.2K | +906.2K |
| Simcoe Capital LLC | Sold Out | 882.1K | 0 | -882.1K |
| Topline Capital Management, LLC | Reduced | 7.1M | 6.3M | -781.0K |
| Qube Research & Technologies Ltd | New | 0 | 689.8K | +689.8K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 319.9K | 973.8K | +653.9K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 56.0K | 681.7K | +625.7K |
| HRT FINANCIAL LP | Increased | 414.1K | 997.8K | +583.7K |
| CenterBook Partners LP | Reduced | 729.9K | 149.2K | -580.7K |
| PRINCIPAL FINANCIAL GROUP INC | Sold Out | 534.8K | 0 | -534.8K |
| TUDOR INVESTMENT CORP ET AL | Increased | 320.7K | 837.9K | +517.2K |
| MARSHALL WACE, LLP | New | 0 | 441.7K | +441.7K |
| ROYCE & ASSOCIATES LP | Increased | 1.6M | 2.1M | +439.2K |
| Point72 Asset Management, L.P. | New | 0 | 422.4K | +422.4K |
| Jain Global LLC | New | 0 | 411.5K | +411.5K |
| D. E. Shaw & Co., Inc. | Increased | 260.1K | 669.2K | +409.1K |
| Public Sector Pension Investment Board | Sold Out | 394.7K | 0 | -394.7K |
| BANK OF AMERICA CORP /DE/ | Increased | 1.0M | 1.3M | +306.3K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.