Prothena Corp Public Ltd Co
PRTA- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001559053
In the last 90 days, Prothena Corp Public Ltd Co insiders filed 4 open-market purchases and 2 sales; 187 institutions reported holding it in 13F filings for Q2 2026, worth $462.7M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Prothena Corp Public Ltd Co as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 186
- +7 vs. Q4 2025
- Shares held
- 47.3M
- +2.17M (+4.8%) vs. Q4 2025
- Total value
- $459.5M
- +$28.4M (+6.6%) vs. Q4 2025
- New holders
- 30
- 68 more added
- Sold out
- 23
- 50 more reduced
3 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting PRTA on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 187 | $462.7M |
| Q1 2026 | 186 | $459.5M |
| Q4 2025 | 182 | $451.6M |
| Q3 2025 | 187 | $415.8M |
| Q2 2025 | 189 | $253.6M |
| Q1 2025 | 161 | $647.2M |
| Q4 2024 | 171 | $741.3M |
| Q3 2024 | 164 | $855.8M |
| Q2 2024 | 160 | $1.05B |
| Q1 2024 | 169 | $1.33B |
| Q4 2023 | 187 | $1.95B |
| Q3 2023 | 187 | $2.56B |
| Q2 2023 | 196 | $3.54B |
| Q1 2023 | 192 | $2.51B |
| Q4 2022 | 201 | $2.98B |
| Q3 2022 | 183 | $2.69B |
| Q2 2022 | 167 | $1.21B |
| Q1 2022 | 174 | $1.61B |
| Q4 2021 | 196 | $2.12B |
| Q3 2021 | 192 | $2.92B |
| Q2 2021 | 156 | $2.08B |
| Q1 2021 | 146 | $1.00B |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| JPMorgan Chase & Co | 25,967 | $240.2K | 0.00% | −143,988−84.7% | Reduced |
| Purkiss Capital Advisors LLC | 25,086 | $243.8K | 0.11% | 00.0% | Unchanged |
| Virtus Investment Advisers, Inc. | 26,320 | $255.8K | 0.07% | +641+2.5% | Added |
| Wells Fargo & Company | 27,337 | $265.7K | 0.00% | −32,771−54.5% | Reduced |
| The PNC Financial Services Group, Inc. | 28,386 | $275.9K | 0.00% | +258+0.9% | Added |
| RBF Capital, LLC | 29,200 | $283.8K | 0.01% | 00.0% | Unchanged |
| Great Lakes Advisors, LLC | 29,593 | $287.6K | 0.00% | +16,404+124.4% | Added |
| Cornerstone Investment Partners, LLC | 30,687 | $298.3K | 0.01% | +30,687 | New |
| Gsa Capital Partners LLP | 32,499 | $316.0K | 0.02% | +6,145+23.3% | Added |
| Covestor Ltd | 32,657 | $317.0K | 0.22% | +10,864+49.9% | Added |
| Fox Run Management, L.L.C. | 35,052 | $324.2K | 0.06% | +25,007+248.9% | Added |
| Winton Group Ltd | 34,700 | $337.3K | 0.01% | +34,700 | New |
| Deutsche Bank AG | 40,018 | $389.0K | 0.00% | +4,536+12.8% | Added |
| Barclays PLC | 40,862 | $397.2K | 0.00% | −142,763−77.7% | Reduced |
| Public Employees Retirement System of Ohio | 42,158 | $409.8K | 0.00% | 00.0% | Unchanged |
| Seven Fleet Capital Management LP | 43,300 | $420.9K | 0.13% | 00.0% | Unchanged |
| Marshall Wace, LLP | 44,574 | $433.3K | 0.00% | −10,204−18.6% | Reduced |
| Invesco Ltd. | 49,808 | $484.1K | 0.00% | +23,199+87.2% | Added |
| Quinn Opportunity Partners LLC | 50,000 | $486.0K | 0.03% | 00.0% | Unchanged |
| Edgewood Management LLC | 50,000 | $486.0K | 0.00% | +25,940+107.8% | Added |
| Rafferty Asset Management, LLC | 53,266 | $517.7K | 0.00% | −29,287−35.5% | Reduced |
| Jackson Creek Investment Advisors LLC | 54,089 | $526.0K | 0.15% | +54,089 | New |
| Rhumbline Advisers | 55,367 | $538.2K | 0.00% | −1,160−2.1% | Reduced |
| Pinnacle Associates Ltd | 60,662 | $589.6K | 0.01% | −2,062−3.3% | Reduced |
| HSBC Holdings PLC | 65,070 | $632.5K | 0.00% | +37,337+134.6% | Added |
| Susquehanna Portfolio Strategies, LLC | 67,870 | $659.7K | 0.01% | +9,017+15.3% | Added |
| Alliancebernstein L.P. | 69,607 | $664.7K | 0.00% | 00.0% | Unchanged |
| Martingale Asset Management L P | 69,101 | $671.7K | 0.02% | +5,648+8.9% | Added |
| Duncan Williams Asset Management, LLC | 70,281 | $683.1K | 0.19% | 00.0% | Unchanged |
| Creative Planning | 72,986 | $709.4K | 0.00% | +11,017+17.8% | Added |
| DCF Advisers, LLC | 73,247 | $712.0K | 0.27% | −122,500−62.6% | Reduced |
| Assenagon Asset Management S.A. | 76,769 | $746.2K | 0.00% | 00.0% | Unchanged |
| American Century Companies Inc | 79,631 | $774.0K | 0.00% | +827+1.0% | Added |
| Hennion & Walsh Asset Management, Inc. | 88,544 | $860.6K | 0.03% | −2,740−3.0% | Reduced |
| Ameriprise Financial Inc | 89,212 | $867.1K | 0.00% | −16,229−15.4% | Reduced |
| XTX Topco Ltd | 92,326 | $897.4K | 0.02% | +37,445+68.2% | Added |
| Price T Rowe Associates Inc | 95,649 | $930.0K | 0.00% | +14,134+17.3% | Added |
| Russell Investments Group, Ltd. | 100,627 | $978.1K | 0.00% | +1,277+1.3% | Added |
| Y-Intercept (Hong Kong) Ltd | 100,805 | $979.8K | 0.02% | +295+0.3% | Added |
| Jane Street Group, LLC | 107,926 | $1.05M | 0.00% | −320,725−74.8% | Reduced |
| Jump Financial, LLC | 118,936 | $1.16M | 0.02% | −118,892−50.0% | Reduced |
| Massachusetts Financial Services Co | 132,051 | $1.28M | 0.00% | +86,081+187.3% | Added |
| Bank of New York Mellon Corp | 136,322 | $1.33M | 0.00% | +3,622+2.7% | Added |
| Campbell & CO Investment Adviser LLC | 142,587 | $1.39M | 0.08% | +48,432+51.4% | Added |
| Quantinno Capital Management LP | 144,299 | $1.40M | 0.00% | +40,681+39.3% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 156,551 | $1.52M | 0.00% | +30,661+24.4% | Added |
| AQR Capital Management LLC | 204,016 | $1.98M | 0.00% | +17,231+9.2% | Added |
| Focused Wealth Management, Inc | 207,403 | $2.02M | 0.21% | +99,924+93.0% | Added |
| Squarepoint Ops LLC | 230,920 | $2.24M | 0.00% | +12,879+5.9% | Added |
| Vanguard Fiduciary Trust Co | 254,573 | $2.47M | 0.00% | +254,573 | New |
| Penbrook Management LLC | 271,720 | $2.64M | 2.00% | +271,720 | New |
| Walleye Capital LLC | 277,168 | $2.69M | 0.02% | +121,133+77.6% | Added |
| Deeter Investments LLP | 300,000 | $2.92M | 0.51% | +300,000 | New |
| UBS Group AG | 328,491 | $3.19M | 0.00% | −97,869−23.0% | Reduced |
| Charles Schwab Investment Management Inc | 356,665 | $3.47M | 0.00% | −670−0.2% | Reduced |
| Northern Trust Corp | 369,542 | $3.59M | 0.00% | +6,301+1.7% | Added |
| Man Group plc | 381,574 | $3.71M | 0.01% | +112,061+41.6% | Added |
| Bank of America Corp | 393,632 | $3.83M | 0.00% | −33,728−7.9% | Reduced |
| Point72 Asset Management, L.P. | 399,830 | $3.89M | 0.01% | −460,188−53.5% | Reduced |
| BNP Paribas Arbitrage, SA | 424,596 | $4.13M | 0.00% | +641+0.2% | Added |
| Citadel Advisors LLC | 435,574 | $4.23M | 0.00% | −476,808−52.3% | Reduced |
| Armistice Capital, LLC | 439,411 | $4.27M | 0.14% | −1,060,589−70.7% | Reduced |
| Birchview Capital, LP | 449,019 | $4.36M | 2.48% | +8,000+1.8% | Added |
| Rangeley Capital, LLC | 449,460 | $4.37M | 4.72% | −75,140−14.3% | Reduced |
| Vanguard Capital Management LLC | 484,126 | $4.71M | 0.00% | +484,126 | New |
| Monimus Capital Management, LP | 485,617 | $4.72M | 1.31% | +231,495+91.1% | Added |
| Mariner, LLC | 563,082 | $5.47M | 0.01% | −14,856−2.6% | Reduced |
| Renaissance Technologies LLC | 607,515 | $5.91M | 0.01% | +172,000+39.5% | Added |
| Qube Research & Technologies Ltd | 614,603 | $5.97M | 0.01% | +206,914+50.8% | Added |
| Nuveen, LLC | 759,368 | $7.38M | 0.00% | +2610.0% | Added |
| Dimensional Fund Advisors LP | 782,603 | $7.61M | 0.00% | +7,396+1.0% | Added |
| Goldman Sachs Group Inc | 818,885 | $7.96M | 0.00% | −116,448−12.4% | Reduced |
| Jacobs Levy Equity Management, Inc | 972,017 | $9.45M | 0.04% | −5,994−0.6% | Reduced |
| Federated Hermes, Inc. | 1,059,849 | $10.3M | 0.02% | +85,482+8.8% | Added |
| Geode Capital Management, LLC | 1,098,166 | $10.7M | 0.00% | +35,097+3.3% | Added |
| Two Sigma Investments, LP | 1,205,978 | $11.7M | 0.01% | +535,840+80.0% | Added |
| Palo Alto Investors LP | 1,208,568 | $11.7M | 1.80% | −111,942−8.5% | Reduced |
| Morgan Stanley | 1,230,448 | $12.0M | 0.00% | −16,327−1.3% | Reduced |
| Vanguard Portfolio Management LLC | 1,445,979 | $14.1M | 0.00% | +1,445,979 | New |
| Acadian Asset Management LLC | 1,547,593 | $15.0M | 0.02% | +110,235+7.7% | Added |
| ADAR1 Capital Management, LLC | 1,581,443 | $15.4M | 0.92% | +123,679+8.5% | Added |
| D. E. Shaw & Co., Inc. | 1,763,347 | $17.1M | 0.01% | +81,978+4.9% | Added |
| State Street Corp | 1,938,498 | $18.8M | 0.00% | −329,304−14.5% | Reduced |
| BlackRock, Inc. | 4,644,160 | $45.1M | 0.00% | +536,701+13.1% | Added |
| Rubric Capital Management LP | 5,000,000 | $48.6M | 0.60% | +1,322,669+36.0% | Added |
| FMR LLC | 7,551,218 | $73.4M | 0.00% | 00.0% | Unchanged |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −427,400−100.0% | Sold out |
| Arrowstreet Capital, Limited Partnership | 0 | $0 | 0.00% | −298,101−100.0% | Sold out |
| Diadema Partners LP | 0 | $0 | 0.00% | −106,539−100.0% | Sold out |
| Caption Management, LLC | 0 | $0 | 0.00% | −61,009−100.0% | Sold out |
| Franklin Resources Inc | 0 | $0 | 0.00% | −47,251−100.0% | Sold out |
| DekaBank Deutsche Girozentrale | 0 | $0 | 0.00% | −14,000−100.0% | Sold out |
| Quadrature Capital Ltd | 0 | $0 | 0.00% | −31,090−100.0% | Sold out |
| Persistent Asset Partners Ltd | 0 | $0 | 0.00% | −28,589−100.0% | Sold out |
| Polymer Capital Management (US) LLC | 0 | $0 | 0.00% | −23,513−100.0% | Sold out |
| Headlands Technologies LLC | 0 | $0 | 0.00% | −23,352−100.0% | Sold out |
| Millennium Management LLC | 0 | $0 | 0.00% | −21,976−100.0% | Sold out |
| Atom Investors LP | 0 | $0 | 0.00% | −17,026−100.0% | Sold out |
| Entropy Technologies, LP | 0 | $0 | 0.00% | −16,900−100.0% | Sold out |
| DRW Securities, LLC | 0 | $0 | 0.00% | −11,955−100.0% | Sold out |