PRTA Prothena Corporation plc
Prothena Corporation plc (PRTA) Institutional Ownership
What the institutions did with PRTA 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 |
|---|---|---|
| FMR LLC | 7.2M | 15.2% |
| Rubric Capital Management LP | 5.0M | 10.6% |
| BlackRock, Inc. | 4.9M | 10.3% |
| STATE STREET CORP | 2.4M | 5.1% |
| ACADIAN ASSET MANAGEMENT LLC | 2.0M | 4.2% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1.7M | 3.5% |
| D. E. Shaw & Co., Inc. | 1.6M | 3.4% |
| ADAR1 Capital Management, LLC | 1.6M | 3.3% |
| TWO SIGMA INVESTMENTS, LP | 1.3M | 2.7% |
| Palo Alto Investors LP | 1.1M | 2.4% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.1M | 2.4% |
| FEDERATED HERMES, INC. | 1.1M | 2.3% |
| MORGAN STANLEY | 995.3K | 2.1% |
| GOLDMAN SACHS GROUP INC | 979.7K | 2.1% |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 966.0K | 2.0% |
| DIMENSIONAL FUND ADVISORS LP | 905.7K | 1.9% |
| Qube Research & Technologies Ltd | 791.2K | 1.7% |
| RENAISSANCE TECHNOLOGIES LLC | 697.6K | 1.5% |
| Man Group plc | 678.1K | 1.4% |
| Mariner, LLC | 625.1K | 1.3% |
| Nuveen, LLC | 557.2K | 1.2% |
| VANGUARD CAPITAL MANAGEMENT LLC | 479.9K | 1.0% |
| NORTHERN TRUST CORP | 457.1K | 1.0% |
| Birchview Capital, LP | 449.0K | 0.9% |
| Rangeley Capital, LLC | 417.3K | 0.9% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| ACADIAN ASSET MANAGEMENT LLC | Increased | 1.5M | 2.0M | +463.1K |
| STATE STREET CORP | Increased | 1.9M | 2.4M | +454.9K |
| ARMISTICE CAPITAL, LLC | Sold Out | 439.4K | 0 | -439.4K |
| Point72 Asset Management, L.P. | Sold Out | 399.8K | 0 | -399.8K |
| FMR LLC | Reduced | 7.6M | 7.2M | -352.0K |
| Man Group plc | Increased | 381.6K | 678.1K | +296.5K |
| Walleye Capital LLC | Sold Out | 277.2K | 0 | -277.2K |
| MACKENZIE FINANCIAL CORP | New | 0 | 239.9K | +239.9K |
| MORGAN STANLEY | Reduced | 1.2M | 995.3K | -235.1K |
| BlackRock, Inc. | Increased | 4.6M | 4.9M | +223.8K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 1.4M | 1.7M | +205.3K |
| Nuveen, LLC | Reduced | 759.4K | 557.2K | -202.2K |
| BANK OF AMERICA CORP /DE/ | Reduced | 393.6K | 208.2K | -185.4K |
| Qube Research & Technologies Ltd | Increased | 614.6K | 791.2K | +176.6K |
| GOLDMAN SACHS GROUP INC | Increased | 818.9K | 979.7K | +160.8K |
| MONIMUS CAPITAL MANAGEMENT, LP | Reduced | 485.6K | 329.1K | -156.6K |
| D. E. Shaw & Co., Inc. | Reduced | 1.8M | 1.6M | -151.9K |
| DIADEMA PARTNERS LP | New | 0 | 149.5K | +149.5K |
| MARSHALL WACE, LLP | Increased | 44.6K | 190.8K | +146.3K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 782.6K | 905.7K | +123.0K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 424.6K | 315.8K | -108.8K |
| JANE STREET GROUP, LLC | Sold Out | 107.9K | 0 | -107.9K |
| Jump Financial, LLC | Reduced | 118.9K | 13.5K | -105.4K |
| Y-Intercept (Hong Kong) Ltd | Sold Out | 100.8K | 0 | -100.8K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 204.0K | 302.6K | +98.6K |
| CITADEL ADVISORS LLC | Reduced | 435.6K | 338.8K | -96.8K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 607.5K | 697.6K | +90.1K |
| NORTHERN TRUST CORP | Increased | 369.5K | 457.1K | +87.6K |
| UBS Group AG | Reduced | 328.5K | 241.4K | -87.1K |
| Campbell & CO Investment Adviser LLC | Reduced | 142.6K | 68.3K | -74.2K |
| ExodusPoint Capital Management, LP | Increased | 11.2K | 82.0K | +70.9K |
| STATE OF WISCONSIN INVESTMENT BOARD | New | 0 | 70.3K | +70.3K |
| Palo Alto Investors LP | Reduced | 1.2M | 1.1M | -65.4K |
| Mariner, LLC | Increased | 563.1K | 625.1K | +62.0K |
| TWO SIGMA INVESTMENTS, LP | Increased | 1.2M | 1.3M | +59.0K |
| Jackson Creek Investment Advisors LLC | Sold Out | 54.1K | 0 | -54.1K |
| Trexquant Investment LP | Increased | 24.5K | 76.7K | +52.2K |
| CITIGROUP INC | Increased | 8.2K | 57.8K | +49.7K |
| Assenagon Asset Management S.A. | Increased | 76.8K | 125.6K | +48.8K |
| Engineers Gate Manager LP | New | 0 | 41.3K | +41.3K |
| SHELTON CAPITAL MANAGEMENT | New | 0 | 39.5K | +39.5K |
| Persistent Asset Partners Ltd | New | 0 | 38.1K | +38.1K |
| Schonfeld Strategic Advisors LLC | Increased | 12.4K | 50.4K | +38.0K |
| Connor, Clark & Lunn Investment Management Ltd. | Increased | 156.6K | 191.7K | +35.1K |
| FOX RUN MANAGEMENT, L.L.C. | Sold Out | 35.1K | 0 | -35.1K |
| GSA CAPITAL PARTNERS LLP | Sold Out | 32.5K | 0 | -32.5K |
| Rangeley Capital, LLC | Reduced | 449.5K | 417.3K | -32.2K |
| Cornerstone Investment Partners, LLC | Sold Out | 30.7K | 0 | -30.7K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.1M | 1.1M | +27.7K |
| ADAR1 Capital Management, LLC | Reduced | 1.6M | 1.6M | -26.9K |
| Aquatic Capital Management LLC | New | 0 | 25.4K | +25.4K |
| FEDERATED HERMES, INC. | Increased | 1.1M | 1.1M | +24.6K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Reduced | 24.4K | 337 | -24.1K |
| CANADA PENSION PLAN INVESTMENT BOARD | New | 0 | 24.0K | +24.0K |
| ENVESTNET ASSET MANAGEMENT INC | New | 0 | 22.9K | +22.9K |
| WELLS FARGO & COMPANY/MN | Increased | 27.3K | 49.5K | +22.2K |
| Invesco Ltd. | Increased | 49.8K | 71.5K | +21.7K |
| Russell Investments Group, Ltd. | Increased | 100.6K | 121.9K | +21.3K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Sold Out | 17.8K | 0 | -17.8K |
| HSBC HOLDINGS PLC | Reduced | 65.1K | 49.6K | -15.5K |
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.