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, Q3 2025
Institutional positions in Prothena Corp Public Ltd Co as of Sep 30, 2025. 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
- −1 vs. Q2 2025
- Shares held
- 42.6M
- +896.5K (+2.1%) vs. Q2 2025
- Total value
- $415.8M
- +$162.6M (+64.2%) vs. Q2 2025
- New holders
- 31
- 58 more added
- Sold out
- 32
- 61 more reduced
1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Susquehanna Portfolio Strategies, LLC | 28,975 | $282.8K | 0.00% | −42,693−59.6% | Reduced |
| RBF Capital, LLC | 29,200 | $285.0K | 0.01% | 00.0% | Unchanged |
| Sandia Investment Management LP | 29,950 | $292.3K | 0.87% | +29,950 | New |
| Arizona PSPRS Trust | 27,700 | $292.5K | 0.01% | +27,700 | New |
| Boothbay Fund Management, LLC | 30,000 | $292.8K | 0.01% | +30,000 | New |
| Proficio Capital Partners LLC | 30,136 | $294.1K | 0.02% | +30,136 | New |
| ExodusPoint Capital Management, LP | 30,254 | $295.3K | 0.00% | −28,664−48.7% | Reduced |
| HRT Financial LP | 31,106 | $303.0K | 0.00% | +31,106 | New |
| Invesco Ltd. | 31,303 | $305.5K | 0.00% | −5,582−15.1% | Reduced |
| Covestor Ltd | 31,432 | $307.0K | 0.17% | −10,863−25.7% | Reduced |
| Deutsche Bank AG | 33,773 | $329.6K | 0.00% | −5,828−14.7% | Reduced |
| HSBC Holdings PLC | 37,432 | $364.6K | 0.00% | −8,615−18.7% | Reduced |
| Wells Fargo & Company | 40,430 | $394.6K | 0.00% | −790−1.9% | Reduced |
| Simplex Trading, LLC | 42,044 | $410.0K | 0.01% | −1,220−2.8% | Reduced |
| Public Employees Retirement System of Ohio | 42,158 | $411.5K | 0.00% | 00.0% | Unchanged |
| Fox Run Management, L.L.C. | 44,332 | $432.7K | 0.07% | +44,332 | New |
| Massachusetts Financial Services Co | 47,489 | $463.5K | 0.00% | +3,125+7.0% | Added |
| Quinn Opportunity Partners LLC | 50,000 | $488.0K | 0.04% | 00.0% | Unchanged |
| Graham Capital Management, L.P. | 53,393 | $521.1K | 0.02% | +19,351+56.8% | Added |
| Balyasny Asset Management LLC | 55,764 | $544.3K | 0.00% | −520,028−90.3% | Reduced |
| Engineers Gate Manager LP | 56,080 | $547.3K | 0.01% | +15,113+36.9% | Added |
| SG Americas Securities, LLC | 56,719 | $554.0K | 0.00% | +4,778+9.2% | Added |
| Focused Wealth Management, Inc | 57,129 | $557.6K | 0.06% | +25,000+77.8% | Added |
| Caption Management, LLC | 61,009 | $595.4K | 0.03% | −4,091−6.3% | Reduced |
| Franklin Resources Inc | 61,172 | $597.0K | 0.00% | +5,094+9.1% | Added |
| Rhumbline Advisers | 62,042 | $605.5K | 0.00% | −963−1.5% | Reduced |
| Creative Planning | 64,140 | $626.0K | 0.00% | +13,571+26.8% | Added |
| Alliancebernstein L.P. | 69,607 | $679.4K | 0.00% | −17,980−20.5% | Reduced |
| Monaco Asset Management SAM | 70,000 | $683.2K | 0.25% | 00.0% | Unchanged |
| Pinnacle Associates Ltd | 71,261 | $695.5K | 0.01% | −2,818−3.8% | Reduced |
| American Century Companies Inc | 72,239 | $705.1K | 0.00% | +12,274+20.5% | Added |
| Price T Rowe Associates Inc | 78,547 | $767.0K | 0.00% | +7,500+10.6% | Added |
| Hennion & Walsh Asset Management, Inc. | 84,598 | $825.7K | 0.03% | −1,556−1.8% | Reduced |
| Duncan Williams Asset Management, LLC | 88,339 | $862.2K | 0.24% | 00.0% | Unchanged |
| Assenagon Asset Management S.A. | 89,704 | $875.5K | 0.00% | +89,704 | New |
| Barclays PLC | 98,075 | $957.2K | 0.00% | −17,773−15.3% | Reduced |
| Quantinno Capital Management LP | 101,187 | $987.6K | 0.00% | +41,569+69.7% | Added |
| Ameriprise Financial Inc | 105,536 | $1.03M | 0.00% | −46,007−30.4% | Reduced |
| Janney Montgomery Scott LLC | 106,898 | $1.04M | 0.00% | +106,898 | New |
| Los Angeles Capital Management LLC | 119,424 | $1.17M | 0.00% | +102,722+615.0% | Added |
| Squarepoint Ops LLC | 127,033 | $1.24M | 0.00% | −82,216−39.3% | Reduced |
| Russell Investments Group, Ltd. | 127,757 | $1.25M | 0.00% | +31,561+32.8% | Added |
| Man Group plc | 131,973 | $1.29M | 0.00% | +89,221+208.7% | Added |
| Bank of New York Mellon Corp | 153,800 | $1.50M | 0.00% | +5,450+3.7% | Added |
| Susquehanna International Group, LLP | 157,447 | $1.54M | 0.00% | +65,497+71.2% | Added |
| Jump Financial, LLC | 186,247 | $1.82M | 0.02% | +186,247 | New |
| Cubist Systematic Strategies, LLC | 190,949 | $1.86M | 0.03% | −310,815−61.9% | Reduced |
| DCF Advisers, LLC | 200,747 | $1.96M | 0.74% | +44,247+28.3% | Added |
| AQR Capital Management LLC | 214,542 | $2.09M | 0.00% | +214,542 | New |
| BNP Paribas Arbitrage, SA | 228,010 | $2.23M | 0.00% | +181,166+386.7% | Added |
| Qube Research & Technologies Ltd | 254,245 | $2.48M | 0.00% | −160,583−38.7% | Reduced |
| Monimus Capital Management, LP | 258,056 | $2.52M | 1.87% | +51,581+25.0% | Added |
| Two Sigma Advisers, LP | 265,700 | $2.59M | 0.01% | +125,900+90.1% | Added |
| Bank of America Corp | 277,096 | $2.70M | 0.00% | +66,151+31.4% | Added |
| Trexquant Investment LP | 278,979 | $2.72M | 0.03% | −273,847−49.5% | Reduced |
| Northern Trust Corp | 334,657 | $3.27M | 0.00% | +1030.0% | Added |
| Charles Schwab Investment Management Inc | 350,821 | $3.42M | 0.00% | +75,737+27.5% | Added |
| Goldman Sachs Group Inc | 353,221 | $3.45M | 0.00% | −175,102−33.1% | Reduced |
| Renaissance Technologies LLC | 371,300 | $3.62M | 0.00% | +281,100+311.6% | Added |
| UBS Group AG | 400,847 | $3.91M | 0.00% | +340,183+560.8% | Added |
| Two Sigma Investments, LP | 426,605 | $4.16M | 0.01% | +225,155+111.8% | Added |
| Algert Global LLC | 445,811 | $4.35M | 0.07% | +397,661+825.9% | Added |
| Birchview Capital, LP | 549,019 | $5.36M | 4.05% | +98,000+21.7% | Added |
| Rangeley Capital, LLC | 560,457 | $5.47M | 5.14% | −154,910−21.7% | Reduced |
| Mariner, LLC | 590,897 | $5.77M | 0.01% | +204,189+52.8% | Added |
| Jane Street Group, LLC | 619,792 | $6.05M | 0.01% | +502,339+427.7% | Added |
| Millennium Management LLC | 621,099 | $6.06M | 0.00% | +450,520+264.1% | Added |
| Point72 Asset Management, L.P. | 646,746 | $6.31M | 0.01% | +646,746 | New |
| Arrowstreet Capital, Limited Partnership | 654,294 | $6.39M | 0.00% | +654,294 | New |
| Nuveen, LLC | 668,290 | $6.52M | 0.00% | +546,135+447.1% | Added |
| Federated Hermes, Inc. | 692,818 | $6.76M | 0.01% | −488,269−41.3% | Reduced |
| JPMorgan Chase & Co | 735,765 | $7.18M | 0.00% | +608,814+479.6% | Added |
| Citadel Advisors LLC | 767,105 | $7.49M | 0.01% | −380,517−33.2% | Reduced |
| Morgan Stanley | 799,674 | $7.80M | 0.00% | −153,582−16.1% | Reduced |
| Dimensional Fund Advisors LP | 806,988 | $7.88M | 0.00% | −155,351−16.1% | Reduced |
| Jacobs Levy Equity Management, Inc | 876,528 | $8.55M | 0.03% | +183,374+26.5% | Added |
| State Street Corp | 901,038 | $8.79M | 0.00% | −103,964−10.3% | Reduced |
| Geode Capital Management, LLC | 1,019,483 | $9.95M | 0.00% | +86,037+9.2% | Added |
| Acadian Asset Management LLC | 1,239,242 | $12.1M | 0.02% | +221,065+21.7% | Added |
| D. E. Shaw & Co., Inc. | 1,315,418 | $12.8M | 0.01% | +923,923+236.0% | Added |
| Palo Alto Investors LP | 1,324,028 | $12.9M | 2.39% | +49,275+3.9% | Added |
| ADAR1 Capital Management, LLC | 1,469,098 | $14.3M | 1.42% | −1,905,911−56.5% | Reduced |
| Rubric Capital Management LP | 1,540,373 | $15.0M | 0.20% | +1,540,373 | New |
| Armistice Capital, LLC | 1,824,000 | $17.8M | 0.56% | −412,000−18.4% | Reduced |
| Vanguard Group Inc | 2,049,849 | $20.0M | 0.00% | −126,378−5.8% | Reduced |
| BlackRock, Inc. | 3,598,417 | $35.1M | 0.00% | −340,981−8.7% | Reduced |
| FMR LLC | 7,901,218 | $77.1M | 0.00% | 00.0% | Unchanged |
| Granahan Investment Management Inc | 0 | $0 | 0.00% | −461,082−100.0% | Sold out |
| Nordea Investment Management AB | 0 | $0 | 0.00% | −311,605−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −307,341−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −210,555−100.0% | Sold out |
| UBS Asset Management Americas Inc | 0 | $0 | 0.00% | −139,284−100.0% | Sold out |
| Wellington Management Group LLP | 0 | $0 | 0.00% | −107,839−100.0% | Sold out |
| State of Wisconsin Investment Board | 0 | $0 | 0.00% | −103,996−100.0% | Sold out |
| Swiss National Bank | 0 | $0 | 0.00% | −56,500−100.0% | Sold out |
| PDT Partners, LLC | 0 | $0 | 0.00% | −41,281−100.0% | Sold out |
| Susquehanna Fundamental Investments, LLC | 0 | $0 | 0.00% | −37,591−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −32,866−100.0% | Sold out |
| Sherbrooke Park Advisers LLC | 0 | $0 | 0.00% | −27,221−100.0% | Sold out |
| Nebula Research & Development LLC | 0 | $0 | 0.00% | −22,857−100.0% | Sold out |