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 $465.6M in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Prothena Corp Public Ltd Co as of Jun 30, 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
- 187
- +5 vs. Q1 2026
- Shares held
- 47.3M
- +367.0K (+0.8%) vs. Q1 2026
- Total value
- $465.6M
- +$9.23M (+2.0%) vs. Q1 2026
- New holders
- 28
- 56 more added
- Sold out
- 23
- 57 more reduced
4 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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 | $465.6M |
| Q1 2026 | 186 | $459.5M |
| Q4 2025 | 182 | $452.1M |
| Q3 2025 | 187 | $423.0M |
| Q2 2025 | 189 | $254.2M |
| Q1 2025 | 161 | $647.4M |
| Q4 2024 | 171 | $745.5M |
| Q3 2024 | 164 | $862.7M |
| Q2 2024 | 160 | $1.06B |
| Q1 2024 | 169 | $1.37B |
| Q4 2023 | 187 | $1.99B |
| Q3 2023 | 187 | $2.57B |
| Q2 2023 | 196 | $3.54B |
| Q1 2023 | 192 | $2.84B |
| Q4 2022 | 201 | $2.98B |
| Q3 2022 | 183 | $2.71B |
| Q2 2022 | 167 | $1.21B |
| Q1 2022 | 174 | $1.64B |
| Q4 2021 | 196 | $2.13B |
| Q3 2021 | 192 | $2.92B |
| Q2 2021 | 156 | $2.09B |
| Q1 2021 | 146 | $1.00B |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| FMR LLC | 7,199,218 | $70.5M | 0.00% | −352,000−4.7% | Reduced |
| Rubric Capital Management LP | 5,000,000 | $49.0M | 0.45% | 00.0% | Unchanged |
| BlackRock, Inc. | 4,867,955 | $47.7M | 0.00% | +223,795+4.8% | Added |
| State Street Corp | 2,393,424 | $23.4M | 0.00% | +454,926+23.5% | Added |
| Acadian Asset Management LLC | 2,010,645 | $19.7M | 0.02% | +463,052+29.9% | Added |
| Vanguard Portfolio Management LLC | 1,651,293 | $16.2M | 0.00% | +205,314+14.2% | Added |
| D. E. Shaw & Co., Inc. | 1,611,457 | $15.8M | 0.01% | −151,890−8.6% | Reduced |
| ADAR1 Capital Management, LLC | 1,554,535 | $15.2M | 0.72% | −26,908−1.7% | Reduced |
| Two Sigma Investments, LP | 1,264,987 | $12.4M | 0.01% | +59,009+4.9% | Added |
| Palo Alto Investors LP | 1,143,155 | $11.2M | 1.55% | −65,413−5.4% | Reduced |
| Geode Capital Management, LLC | 1,125,877 | $11.0M | 0.00% | +27,711+2.5% | Added |
| Federated Hermes, Inc. | 1,084,401 | $10.6M | 0.02% | +24,552+2.3% | Added |
| Morgan Stanley | 995,348 | $9.74M | 0.00% | −235,100−19.1% | Reduced |
| Goldman Sachs Group Inc | 979,730 | $9.59M | 0.00% | +160,845+19.6% | Added |
| Jacobs Levy Equity Management, Inc | 965,988 | $9.46M | 0.03% | −6,029−0.6% | Reduced |
| Dimensional Fund Advisors LP | 905,651 | $8.87M | 0.00% | +123,048+15.7% | Added |
| Qube Research & Technologies Ltd | 791,169 | $7.75M | 0.01% | +176,566+28.7% | Added |
| Renaissance Technologies LLC | 697,615 | $6.83M | 0.01% | +90,100+14.8% | Added |
| Man Group plc | 678,116 | $6.64M | 0.01% | +296,542+77.7% | Added |
| Mariner, LLC | 625,095 | $6.12M | 0.01% | +62,013+11.0% | Added |
| Nuveen, LLC | 557,157 | $5.45M | 0.00% | −202,211−26.6% | Reduced |
| Vanguard Capital Management LLC | 479,945 | $4.70M | 0.00% | −4,181−0.9% | Reduced |
| Northern Trust Corp | 457,124 | $4.48M | 0.00% | +87,582+23.7% | Added |
| Birchview Capital, LP | 449,019 | $4.40M | 2.06% | 00.0% | Unchanged |
| Rangeley Capital, LLC | 417,270 | $4.09M | 3.80% | −32,190−7.2% | Reduced |
| Charles Schwab Investment Management Inc | 355,896 | $3.48M | 0.00% | −769−0.2% | Reduced |
| Citadel Advisors LLC | 338,810 | $3.32M | 0.00% | −96,764−22.2% | Reduced |
| Monimus Capital Management, LP | 329,052 | $3.22M | 0.82% | −156,565−32.2% | Reduced |
| BNP Paribas Arbitrage, SA | 315,803 | $3.09M | 0.00% | −108,793−25.6% | Reduced |
| AQR Capital Management LLC | 302,572 | $2.96M | 0.00% | +98,556+48.3% | Added |
| Penbrook Management LLC | 271,720 | $2.66M | 1.70% | 00.0% | Unchanged |
| Vanguard Fiduciary Trust Co | 259,064 | $2.54M | 0.00% | +4,491+1.8% | Added |
| UBS Group AG | 241,425 | $2.36M | 0.00% | −87,066−26.5% | Reduced |
| Mackenzie Financial Corp | 239,899 | $2.35M | 0.00% | +239,899 | New |
| Coppell Advisory Solutions LLC | 12 | $2.33M | 0.19% | +12 | New |
| Squarepoint Ops LLC | 223,971 | $2.19M | 0.00% | −6,949−3.0% | Reduced |
| Bank of America Corp | 208,246 | $2.04M | 0.00% | −185,386−47.1% | Reduced |
| Focused Wealth Management, Inc | 207,445 | $2.03M | 0.18% | +420.0% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 191,693 | $1.88M | 0.00% | +35,142+22.4% | Added |
| Marshall Wace, LLP | 190,834 | $1.87M | 0.00% | +146,260+328.1% | Added |
| Quantinno Capital Management LP | 158,331 | $1.55M | 0.00% | +14,032+9.7% | Added |
| Diadema Partners LP | 149,482 | $1.46M | 0.52% | +149,482 | New |
| Bank of New York Mellon Corp | 133,906 | $1.31M | 0.00% | −2,416−1.8% | Reduced |
| Massachusetts Financial Services Co | 126,990 | $1.24M | 0.00% | −5,061−3.8% | Reduced |
| Assenagon Asset Management S.A. | 125,570 | $1.23M | 0.00% | +48,801+63.6% | Added |
| Russell Investments Group, Ltd. | 121,901 | $1.19M | 0.00% | +21,274+21.1% | Added |
| Price T Rowe Associates Inc | 109,252 | $1.07M | 0.00% | +13,603+14.2% | Added |
| Hennion & Walsh Asset Management, Inc. | 90,795 | $888.9K | 0.03% | +2,251+2.5% | Added |
| American Century Companies Inc | 90,644 | $887.4K | 0.00% | +11,013+13.8% | Added |
| Ameriprise Financial Inc | 87,215 | $853.8K | 0.00% | −1,997−2.2% | Reduced |
| XTX Topco Ltd | 85,717 | $839.2K | 0.01% | −6,609−7.2% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 82,710 | $809.7K | 0.01% | +14,840+21.9% | Added |
| ExodusPoint Capital Management, LP | 82,023 | $803.0K | 0.01% | +70,851+634.2% | Added |
| Martingale Asset Management L P | 78,800 | $771.5K | 0.02% | +9,699+14.0% | Added |
| Trexquant Investment LP | 76,731 | $751.2K | 0.00% | +52,188+212.6% | Added |
| DCF Advisers, LLC | 73,247 | $717.1K | 0.19% | 00.0% | Unchanged |
| Invesco Ltd. | 71,479 | $699.8K | 0.00% | +21,671+43.5% | Added |
| State of Wisconsin Investment Board | 70,326 | $688.5K | 0.00% | +70,326 | New |
| Duncan Williams Asset Management, LLC | 70,281 | $688.1K | 0.16% | 00.0% | Unchanged |
| Alliancebernstein L.P. | 69,217 | $672.8K | 0.00% | −390−0.6% | Reduced |
| Campbell & CO Investment Adviser LLC | 68,345 | $669.1K | 0.04% | −74,242−52.1% | Reduced |
| Creative Planning | 62,620 | $613.0K | 0.00% | −10,366−14.2% | Reduced |
| Pinnacle Associates Ltd | 57,918 | $567.0K | 0.01% | −2,744−4.5% | Reduced |
| Citigroup Inc | 57,827 | $566.1K | 0.00% | +49,677+609.5% | Added |
| Rhumbline Advisers | 55,896 | $547.2K | 0.00% | +529+1.0% | Added |
| Schonfeld Strategic Advisors LLC | 50,350 | $492.9K | 0.00% | +37,951+306.1% | Added |
| HSBC Holdings PLC | 49,569 | $492.2K | 0.00% | −15,501−23.8% | Reduced |
| Edgewood Management LLC | 50,000 | $489.5K | 0.01% | 00.0% | Unchanged |
| Quinn Opportunity Partners LLC | 50,000 | $489.5K | 0.02% | 00.0% | Unchanged |
| Wells Fargo & Company | 49,520 | $484.8K | 0.00% | +22,183+81.1% | Added |
| Seven Fleet Capital Management LP | 43,300 | $423.9K | 0.07% | 00.0% | Unchanged |
| Deutsche Bank AG | 43,270 | $423.6K | 0.00% | +3,252+8.1% | Added |
| Public Employees Retirement System of Ohio | 42,158 | $412.7K | 0.00% | 00.0% | Unchanged |
| Engineers Gate Manager LP | 41,270 | $404.0K | 0.01% | +41,270 | New |
| Rafferty Asset Management, LLC | 40,397 | $395.5K | 0.00% | −12,869−24.2% | Reduced |
| Virtus Investment Advisers, Inc. | 39,660 | $388.3K | 0.09% | +13,340+50.7% | Added |
| Shelton Capital Management | 39,472 | $386.4K | 0.01% | +39,472 | New |
| Persistent Asset Partners Ltd | 38,100 | $373.0K | 0.12% | +38,100 | New |
| Barclays PLC | 37,623 | $368.3K | 0.00% | −3,239−7.9% | Reduced |
| SEI Investments Co | 30,877 | $302.3K | 0.00% | +13,629+79.0% | Added |
| Winton Group Ltd | 30,500 | $298.6K | 0.01% | −4,200−12.1% | Reduced |
| RBF Capital, LLC | 29,200 | $285.9K | 0.01% | 00.0% | Unchanged |
| Great Lakes Advisors, LLC | 28,733 | $281.3K | 0.00% | −860−2.9% | Reduced |
| The PNC Financial Services Group, Inc. | 28,386 | $277.9K | 0.00% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 26,620 | $265.4K | 0.00% | +653+2.5% | Added |
| MetLife Investment Management | 25,890 | $253.5K | 0.00% | +6,374+32.7% | Added |
| Aquatic Capital Management LLC | 25,419 | $248.9K | 0.01% | +25,419 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 25,174 | $247.3K | 0.00% | +535+2.2% | Added |
| Covestor Ltd | 25,190 | $246.0K | 0.14% | −7,467−22.9% | Reduced |
| Purkiss Capital Advisors LLC | 25,086 | $245.6K | 0.09% | 00.0% | Unchanged |
| Tudor Investment Corp Et Al | 24,445 | $239.3K | 0.00% | −26−0.1% | Reduced |
| Canada Pension Plan Investment Board | 24,000 | $235.0K | 0.00% | +24,000 | New |
| Envestnet Asset Management Inc | 22,908 | $224.3K | 0.00% | +22,908 | New |
| Mogy Joel R Investment Counsel Inc | 20,750 | $203.1K | 0.01% | 00.0% | Unchanged |
| Profund Advisors LLC | 20,570 | $201.4K | 0.01% | −3,435−14.3% | Reduced |
| Jones Financial Companies LLLP | 19,430 | $194.7K | 0.00% | +21+0.1% | Added |
| Savant Capital, LLC | 19,503 | $190.2K | 0.00% | +9,372+92.5% | Added |
| Foundation Wealth Management, LLC | 19,236 | $188.3K | 0.11% | 00.0% | Unchanged |
| Graham Capital Management, L.P. | 18,496 | $181.1K | 0.00% | +5,676+44.3% | Added |
| Vanguard Global Advisers, LLC | 18,249 | $178.7K | 0.00% | 00.0% | Unchanged |