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 |
|---|---|---|---|---|---|
| FMR LLC | 7,551,218 | $73.4M | 0.00% | 00.0% | Unchanged |
| Rubric Capital Management LP | 5,000,000 | $48.6M | 0.60% | +1,322,669+36.0% | Added |
| BlackRock, Inc. | 4,644,160 | $45.1M | 0.00% | +536,701+13.1% | Added |
| State Street Corp | 1,938,498 | $18.8M | 0.00% | −329,304−14.5% | Reduced |
| D. E. Shaw & Co., Inc. | 1,763,347 | $17.1M | 0.01% | +81,978+4.9% | Added |
| ADAR1 Capital Management, LLC | 1,581,443 | $15.4M | 0.92% | +123,679+8.5% | Added |
| Acadian Asset Management LLC | 1,547,593 | $15.0M | 0.02% | +110,235+7.7% | Added |
| Vanguard Portfolio Management LLC | 1,445,979 | $14.1M | 0.00% | +1,445,979 | New |
| Morgan Stanley | 1,230,448 | $12.0M | 0.00% | −16,327−1.3% | Reduced |
| Palo Alto Investors LP | 1,208,568 | $11.7M | 1.80% | −111,942−8.5% | Reduced |
| Two Sigma Investments, LP | 1,205,978 | $11.7M | 0.01% | +535,840+80.0% | Added |
| Geode Capital Management, LLC | 1,098,166 | $10.7M | 0.00% | +35,097+3.3% | Added |
| Federated Hermes, Inc. | 1,059,849 | $10.3M | 0.02% | +85,482+8.8% | Added |
| Jacobs Levy Equity Management, Inc | 972,017 | $9.45M | 0.04% | −5,994−0.6% | Reduced |
| Goldman Sachs Group Inc | 818,885 | $7.96M | 0.00% | −116,448−12.4% | Reduced |
| Dimensional Fund Advisors LP | 782,603 | $7.61M | 0.00% | +7,396+1.0% | Added |
| Nuveen, LLC | 759,368 | $7.38M | 0.00% | +2610.0% | Added |
| Qube Research & Technologies Ltd | 614,603 | $5.97M | 0.01% | +206,914+50.8% | Added |
| Renaissance Technologies LLC | 607,515 | $5.91M | 0.01% | +172,000+39.5% | Added |
| Mariner, LLC | 563,082 | $5.47M | 0.01% | −14,856−2.6% | Reduced |
| Monimus Capital Management, LP | 485,617 | $4.72M | 1.31% | +231,495+91.1% | Added |
| Vanguard Capital Management LLC | 484,126 | $4.71M | 0.00% | +484,126 | New |
| Rangeley Capital, LLC | 449,460 | $4.37M | 4.72% | −75,140−14.3% | Reduced |
| Birchview Capital, LP | 449,019 | $4.36M | 2.48% | +8,000+1.8% | Added |
| Armistice Capital, LLC | 439,411 | $4.27M | 0.14% | −1,060,589−70.7% | Reduced |
| Citadel Advisors LLC | 435,574 | $4.23M | 0.00% | −476,808−52.3% | Reduced |
| BNP Paribas Arbitrage, SA | 424,596 | $4.13M | 0.00% | +641+0.2% | Added |
| Point72 Asset Management, L.P. | 399,830 | $3.89M | 0.01% | −460,188−53.5% | Reduced |
| Bank of America Corp | 393,632 | $3.83M | 0.00% | −33,728−7.9% | Reduced |
| Man Group plc | 381,574 | $3.71M | 0.01% | +112,061+41.6% | Added |
| Northern Trust Corp | 369,542 | $3.59M | 0.00% | +6,301+1.7% | Added |
| Charles Schwab Investment Management Inc | 356,665 | $3.47M | 0.00% | −670−0.2% | Reduced |
| UBS Group AG | 328,491 | $3.19M | 0.00% | −97,869−23.0% | Reduced |
| Deeter Investments LLP | 300,000 | $2.92M | 0.51% | +300,000 | New |
| Walleye Capital LLC | 277,168 | $2.69M | 0.02% | +121,133+77.6% | Added |
| Penbrook Management LLC | 271,720 | $2.64M | 2.00% | +271,720 | New |
| Vanguard Fiduciary Trust Co | 254,573 | $2.47M | 0.00% | +254,573 | New |
| Squarepoint Ops LLC | 230,920 | $2.24M | 0.00% | +12,879+5.9% | Added |
| Focused Wealth Management, Inc | 207,403 | $2.02M | 0.21% | +99,924+93.0% | Added |
| AQR Capital Management LLC | 204,016 | $1.98M | 0.00% | +17,231+9.2% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 156,551 | $1.52M | 0.00% | +30,661+24.4% | Added |
| Quantinno Capital Management LP | 144,299 | $1.40M | 0.00% | +40,681+39.3% | Added |
| Campbell & CO Investment Adviser LLC | 142,587 | $1.39M | 0.08% | +48,432+51.4% | Added |
| Bank of New York Mellon Corp | 136,322 | $1.33M | 0.00% | +3,622+2.7% | Added |
| Massachusetts Financial Services Co | 132,051 | $1.28M | 0.00% | +86,081+187.3% | Added |
| Jump Financial, LLC | 118,936 | $1.16M | 0.02% | −118,892−50.0% | Reduced |
| Jane Street Group, LLC | 107,926 | $1.05M | 0.00% | −320,725−74.8% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 100,805 | $979.8K | 0.02% | +295+0.3% | Added |
| Russell Investments Group, Ltd. | 100,627 | $978.1K | 0.00% | +1,277+1.3% | Added |
| Price T Rowe Associates Inc | 95,649 | $930.0K | 0.00% | +14,134+17.3% | Added |
| XTX Topco Ltd | 92,326 | $897.4K | 0.02% | +37,445+68.2% | Added |
| Ameriprise Financial Inc | 89,212 | $867.1K | 0.00% | −16,229−15.4% | Reduced |
| Hennion & Walsh Asset Management, Inc. | 88,544 | $860.6K | 0.03% | −2,740−3.0% | Reduced |
| American Century Companies Inc | 79,631 | $774.0K | 0.00% | +827+1.0% | Added |
| Assenagon Asset Management S.A. | 76,769 | $746.2K | 0.00% | 00.0% | Unchanged |
| DCF Advisers, LLC | 73,247 | $712.0K | 0.27% | −122,500−62.6% | Reduced |
| Creative Planning | 72,986 | $709.4K | 0.00% | +11,017+17.8% | Added |
| Duncan Williams Asset Management, LLC | 70,281 | $683.1K | 0.19% | 00.0% | Unchanged |
| Martingale Asset Management L P | 69,101 | $671.7K | 0.02% | +5,648+8.9% | Added |
| Alliancebernstein L.P. | 69,607 | $664.7K | 0.00% | 00.0% | Unchanged |
| Susquehanna Portfolio Strategies, LLC | 67,870 | $659.7K | 0.01% | +9,017+15.3% | Added |
| HSBC Holdings PLC | 65,070 | $632.5K | 0.00% | +37,337+134.6% | Added |
| Pinnacle Associates Ltd | 60,662 | $589.6K | 0.01% | −2,062−3.3% | Reduced |
| Rhumbline Advisers | 55,367 | $538.2K | 0.00% | −1,160−2.1% | Reduced |
| Jackson Creek Investment Advisors LLC | 54,089 | $526.0K | 0.15% | +54,089 | New |
| Rafferty Asset Management, LLC | 53,266 | $517.7K | 0.00% | −29,287−35.5% | Reduced |
| 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 |
| Invesco Ltd. | 49,808 | $484.1K | 0.00% | +23,199+87.2% | Added |
| Marshall Wace, LLP | 44,574 | $433.3K | 0.00% | −10,204−18.6% | Reduced |
| Seven Fleet Capital Management LP | 43,300 | $420.9K | 0.13% | 00.0% | Unchanged |
| Public Employees Retirement System of Ohio | 42,158 | $409.8K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 40,862 | $397.2K | 0.00% | −142,763−77.7% | Reduced |
| Deutsche Bank AG | 40,018 | $389.0K | 0.00% | +4,536+12.8% | Added |
| Winton Group Ltd | 34,700 | $337.3K | 0.01% | +34,700 | New |
| Fox Run Management, L.L.C. | 35,052 | $324.2K | 0.06% | +25,007+248.9% | Added |
| Covestor Ltd | 32,657 | $317.0K | 0.22% | +10,864+49.9% | Added |
| Gsa Capital Partners LLP | 32,499 | $316.0K | 0.02% | +6,145+23.3% | Added |
| Cornerstone Investment Partners, LLC | 30,687 | $298.3K | 0.01% | +30,687 | New |
| Great Lakes Advisors, LLC | 29,593 | $287.6K | 0.00% | +16,404+124.4% | Added |
| RBF Capital, LLC | 29,200 | $283.8K | 0.01% | 00.0% | Unchanged |
| The PNC Financial Services Group, Inc. | 28,386 | $275.9K | 0.00% | +258+0.9% | Added |
| Wells Fargo & Company | 27,337 | $265.7K | 0.00% | −32,771−54.5% | Reduced |
| Virtus Investment Advisers, Inc. | 26,320 | $255.8K | 0.07% | +641+2.5% | Added |
| Purkiss Capital Advisors LLC | 25,086 | $243.8K | 0.11% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 25,967 | $240.2K | 0.00% | −143,988−84.7% | Reduced |
| Trexquant Investment LP | 24,543 | $238.6K | 0.00% | +5,159+26.6% | Added |
| Tudor Investment Corp Et Al | 24,471 | $237.9K | 0.00% | −2,002−7.6% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 24,639 | $237.7K | 0.00% | −601−2.4% | Reduced |
| Los Angeles Capital Management LLC | 24,419 | $237.4K | 0.00% | −70,987−74.4% | Reduced |
| Profund Advisors LLC | 24,005 | $233.3K | 0.01% | −6,611−21.6% | Reduced |
| Mogy Joel R Investment Counsel Inc | 20,750 | $201.7K | 0.01% | 00.0% | Unchanged |
| MetLife Investment Management | 19,516 | $189.7K | 0.00% | −5,985−23.5% | Reduced |
| Foundation Wealth Management, LLC | 19,236 | $187.0K | 0.13% | +19,236 | New |
| Jones Financial Companies LLLP | 19,409 | $179.7K | 0.00% | +3,509+22.1% | Added |
| Vanguard Global Advisers, LLC | 18,249 | $177.4K | 0.00% | +18,249 | New |
| Susquehanna International Group, LLP | 17,792 | $172.9K | 0.00% | +1,817+11.4% | Added |
| SEI Investments Co | 17,248 | $167.6K | 0.00% | +17,248 | New |
| Chicago Partners Investment Group LLC | 15,365 | $164.7K | 0.00% | +143+0.9% | Added |
| Ballentine Partners, LLC | 16,793 | $163.2K | 0.00% | −1,277−7.1% | Reduced |