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.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest 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 |
| CITADEL ADVISORS LLC | Increased | 471.4K | 721.5K | +250.1K |
| Bank of New York Mellon Corp | Reduced | 608.6K | 371.4K | -237.2K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 2.8M | 3.1M | +225.6K |
| FMR LLC | Increased | 283.4K | 504.4K | +221.0K |
| Invesco Ltd. | Reduced | 388.2K | 185.7K | -202.6K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 193.1K | +193.1K |
| GOLDMAN SACHS GROUP INC | Reduced | 2.3M | 2.2M | -177.2K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 4.8M | 4.9M | +176.7K |
| AMERIPRISE FINANCIAL INC | Reduced | 187.3K | 14.1K | -173.1K |
| Legal & General Group Plc | Reduced | 182.9K | 11.8K | -171.1K |
| JPMORGAN CHASE & CO | Reduced | 299.1K | 141.9K | -157.2K |
| Russell Investments Group, Ltd. | Increased | 1.4M | 1.5M | +151.4K |
| XTX Topco Ltd | New | 0 | 142.7K | +142.7K |
| TWO SIGMA INVESTMENTS, LP | Increased | 25.6K | 168.2K | +142.6K |
| BNP PARIBAS FINANCIAL MARKETS | Increased | 78.0K | 215.0K | +137.0K |
| Jump Financial, LLC | Increased | 28.9K | 148.1K | +119.2K |
| STATE OF WISCONSIN INVESTMENT BOARD | Sold Out | 104.0K | 0 | -104.0K |
| RHUMBLINE ADVISERS | Reduced | 254.6K | 153.2K | -101.4K |
| AQR CAPITAL MANAGEMENT LLC | Reduced | 912.3K | 814.0K | -98.4K |
| UBS Group AG | Reduced | 186.9K | 88.9K | -98.0K |
| PRUDENTIAL FINANCIAL INC | Reduced | 117.6K | 23.3K | -94.3K |
| Aquatic Capital Management LLC | New | 0 | 76.8K | +76.8K |
| Thrivent Financial for Lutherans | Sold Out | 73.4K | 0 | -73.4K |
| VOYA INVESTMENT MANAGEMENT LLC | Reduced | 141.4K | 74.0K | -67.4K |
| Catalyst Funds Management Pty Ltd | New | 0 | 62.5K | +62.5K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | New | 0 | 62.2K | +62.2K |
| Illinois Municipal Retirement Fund | Sold Out | 60.9K | 0 | -60.9K |
| GSA CAPITAL PARTNERS LLP | Increased | 109.1K | 167.6K | +58.5K |
| Squarepoint Ops LLC | Increased | 25.3K | 82.8K | +57.5K |
| WELLS FARGO & COMPANY/MN | Increased | 45.3K | 102.7K | +57.4K |
| State of Alaska, Department of Revenue | Reduced | 61.3K | 6.5K | -54.8K |
| Balyasny Asset Management L.P. | New | 0 | 54.4K | +54.4K |
| IEQ CAPITAL, LLC | Reduced | 144.4K | 90.1K | -54.3K |
| PANAGORA ASSET MANAGEMENT INC | Sold Out | 51.6K | 0 | -51.6K |
| Louisiana State Employees Retirement System | Sold Out | 48.8K | 0 | -48.8K |
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.