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, Q2 2025
Institutional positions in Prothena Corp Public Ltd Co as of Jun 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
- 189
- +29 vs. Q1 2025
- Shares held
- 41.8M
- −10.5M (−20.2%) vs. Q1 2025
- Total value
- $253.6M
- −$393.7M (−60.8%) vs. Q1 2025
- New holders
- 51
- 54 more added
- Sold out
- 22
- 41 more reduced
1 institution that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 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, Q2 2025
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Dark Forest Capital Management LP | 32,866 | $199.5K | 0.01% | +11,807+56.1% | Added |
| California State Teachers Retirement System | 33,243 | $201.8K | 0.00% | 00.0% | Unchanged |
| Graham Capital Management, L.P. | 34,042 | $206.6K | 0.01% | +34,042 | New |
| Invesco Ltd. | 36,885 | $223.9K | 0.00% | −753−2.0% | Reduced |
| Susquehanna Fundamental Investments, LLC | 37,591 | $228.2K | 0.01% | −37,181−49.7% | Reduced |
| Thrivent Financial for Lutherans | 38,626 | $234.0K | 0.00% | 00.0% | Unchanged |
| Deutsche Bank AG | 39,601 | $240.4K | 0.00% | −56,209−58.7% | Reduced |
| Engineers Gate Manager LP | 40,967 | $248.7K | 0.00% | +40,967 | New |
| Wells Fargo & Company | 41,220 | $250.2K | 0.00% | −4,669−10.2% | Reduced |
| PDT Partners, LLC | 41,281 | $250.6K | 0.01% | −109,035−72.5% | Reduced |
| Public Employees Retirement System of Ohio | 42,158 | $255.9K | 0.00% | +42,158 | New |
| Covestor Ltd | 42,295 | $257.0K | 0.15% | +42,291+1,057,275.0% | Added |
| Man Group plc | 42,752 | $259.5K | 0.00% | +25,752+151.5% | Added |
| Simplex Trading, LLC | 43,264 | $262.0K | 0.01% | +43,264 | New |
| Massachusetts Financial Services Co | 44,364 | $269.3K | 0.00% | +548+1.3% | Added |
| HSBC Holdings PLC | 46,047 | $282.3K | 0.00% | +32,959+251.8% | Added |
| BNP Paribas Arbitrage, SA | 46,844 | $284.3K | 0.00% | +37,267+389.1% | Added |
| Algert Global LLC | 48,150 | $292.3K | 0.01% | +48,150 | New |
| Citigroup Inc | 49,303 | $299.3K | 0.00% | −16,523−25.1% | Reduced |
| Quinn Opportunity Partners LLC | 50,000 | $303.5K | 0.03% | +50,000 | New |
| Creative Planning | 50,569 | $307.0K | 0.00% | +39,879+373.0% | Added |
| SG Americas Securities, LLC | 51,941 | $315.0K | 0.00% | −20,618−28.4% | Reduced |
| Franklin Resources Inc | 56,078 | $340.4K | 0.00% | +36,331+184.0% | Added |
| Swiss National Bank | 56,500 | $343.0K | 0.00% | −12,200−17.8% | Reduced |
| Norges Bank | 57,454 | $348.7K | 0.00% | 00.0% | Unchanged |
| ExodusPoint Capital Management, LP | 58,918 | $358.0K | 0.00% | +17,646+42.8% | Added |
| Quantinno Capital Management LP | 59,618 | $361.9K | 0.00% | +59,618 | New |
| American Century Companies Inc | 59,965 | $364.0K | 0.00% | +25,129+72.1% | Added |
| UBS Group AG | 60,664 | $368.2K | 0.00% | −183,815−75.2% | Reduced |
| Rhumbline Advisers | 63,005 | $382.4K | 0.00% | −3,074−4.7% | Reduced |
| Caption Management, LLC | 65,100 | $395.2K | 0.04% | +65,100 | New |
| Monaco Asset Management SAM | 70,000 | $424.9K | 0.16% | +70,000 | New |
| Price T Rowe Associates Inc | 71,047 | $432.0K | 0.00% | −3,384,809−97.9% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 71,668 | $435.0K | 0.01% | +71,668 | New |
| Pinnacle Associates Ltd | 74,079 | $449.7K | 0.01% | −26,180−26.1% | Reduced |
| Hennion & Walsh Asset Management, Inc. | 86,154 | $523.0K | 0.02% | +8,517+11.0% | Added |
| Alliancebernstein L.P. | 87,587 | $531.7K | 0.00% | +40,834+87.3% | Added |
| Duncan Williams Asset Management, LLC | 88,339 | $536.2K | 0.17% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 90,200 | $547.5K | 0.00% | −149,700−62.4% | Reduced |
| Susquehanna International Group, LLP | 91,950 | $558.1K | 0.00% | +14,707+19.0% | Added |
| Russell Investments Group, Ltd. | 96,196 | $583.9K | 0.00% | +95,002+7,956.6% | Added |
| State of Wisconsin Investment Board | 103,996 | $631.3K | 0.00% | +103,996 | New |
| Royal Bank of Canada | 105,939 | $643.0K | 0.00% | +101,621+2,353.4% | Added |
| Wellington Management Group LLP | 107,839 | $654.6K | 0.00% | −5,091,689−97.9% | Reduced |
| Barclays PLC | 115,848 | $703.2K | 0.00% | +32,467+38.9% | Added |
| Jane Street Group, LLC | 117,453 | $712.9K | 0.00% | −15,187−11.4% | Reduced |
| Nuveen, LLC | 122,155 | $741.5K | 0.00% | −27,806−18.5% | Reduced |
| JPMorgan Chase & Co | 126,951 | $770.6K | 0.00% | −245,014−65.9% | Reduced |
| UBS Asset Management Americas Inc | 139,284 | $845.5K | 0.00% | −242,368−63.5% | Reduced |
| Two Sigma Advisers, LP | 139,800 | $848.6K | 0.00% | +139,800 | New |
| Bank of New York Mellon Corp | 148,350 | $900.5K | 0.00% | +2,341+1.6% | Added |
| Ameriprise Financial Inc | 151,543 | $919.9K | 0.00% | +151,543 | New |
| DCF Advisers, LLC | 156,500 | $950.0K | 0.46% | −38,500−19.7% | Reduced |
| Millennium Management LLC | 170,579 | $1.04M | 0.00% | +118,112+225.1% | Added |
| Two Sigma Investments, LP | 201,450 | $1.22M | 0.00% | +185,417+1,156.5% | Added |
| Monimus Capital Management, LP | 206,475 | $1.25M | 1.01% | +206,475 | New |
| Squarepoint Ops LLC | 209,249 | $1.27M | 0.00% | +209,249 | New |
| Gsa Capital Partners LLP | 210,555 | $1.28M | 0.09% | +210,555 | New |
| Bank of America Corp | 210,945 | $1.28M | 0.00% | +78,959+59.8% | Added |
| Prosight Management, LP | 267,800 | $1.63M | 0.40% | −140,322−34.4% | Reduced |
| Charles Schwab Investment Management Inc | 275,084 | $1.67M | 0.00% | −44,523−13.9% | Reduced |
| Schonfeld Strategic Advisors LLC | 307,341 | $1.87M | 0.01% | +307,341 | New |
| Nordea Investment Management AB | 311,605 | $1.92M | 0.00% | +3,618+1.2% | Added |
| Northern Trust Corp | 334,554 | $2.03M | 0.00% | −39,149−10.5% | Reduced |
| Mariner, LLC | 386,708 | $2.35M | 0.00% | +32,058+9.0% | Added |
| D. E. Shaw & Co., Inc. | 391,495 | $2.38M | 0.00% | +373,692+2,099.0% | Added |
| Qube Research & Technologies Ltd | 414,828 | $2.52M | 0.00% | +414,828 | New |
| Birchview Capital, LP | 451,019 | $2.74M | 2.72% | +118,045+35.5% | Added |
| Granahan Investment Management Inc | 461,082 | $2.80M | 0.11% | +461,082 | New |
| Rock Springs Capital Management LP | 492,601 | $2.99M | 0.19% | 00.0% | Unchanged |
| Cubist Systematic Strategies, LLC | 501,764 | $3.05M | 0.03% | +501,764 | New |
| Goldman Sachs Group Inc | 528,323 | $3.21M | 0.00% | +17,861+3.5% | Added |
| Trexquant Investment LP | 552,826 | $3.36M | 0.04% | +552,826 | New |
| Balyasny Asset Management LLC | 575,792 | $3.50M | 0.01% | +575,792 | New |
| Jacobs Levy Equity Management, Inc | 693,154 | $4.21M | 0.02% | +674,601+3,636.1% | Added |
| Rangeley Capital, LLC | 715,367 | $4.34M | 5.47% | +715,367 | New |
| Geode Capital Management, LLC | 933,446 | $5.67M | 0.00% | −81,346−8.0% | Reduced |
| Morgan Stanley | 953,256 | $5.79M | 0.00% | +233,268+32.4% | Added |
| Dimensional Fund Advisors LP | 962,339 | $5.84M | 0.00% | +99,191+11.5% | Added |
| State Street Corp | 1,005,002 | $6.10M | 0.00% | −516,362−33.9% | Reduced |
| Acadian Asset Management LLC | 1,018,177 | $6.18M | 0.01% | +1,018,177 | New |
| Citadel Advisors LLC | 1,147,622 | $6.97M | 0.01% | +1,058,223+1,183.7% | Added |
| Federated Hermes, Inc. | 1,181,087 | $7.17M | 0.01% | +634,832+116.2% | Added |
| Palo Alto Investors LP | 1,274,753 | $7.74M | 1.65% | −384,981−23.2% | Reduced |
| Vanguard Group Inc | 2,176,227 | $13.2M | 0.00% | +906,956+71.5% | Added |
| Armistice Capital, LLC | 2,236,000 | $13.6M | 0.51% | +40,000+1.8% | Added |
| ADAR1 Capital Management, LLC | 3,375,009 | $20.5M | 3.33% | +3,375,009 | New |
| BlackRock, Inc. | 3,939,398 | $23.9M | 0.00% | −102,903−2.5% | Reduced |
| FMR LLC | 7,901,218 | $48.0M | 0.00% | −40,184−0.5% | Reduced |
| EcoR1 Capital, LLC | 0 | $0 | 0.00% | −11,584,280−100.0% | Sold out |
| Siren, L.L.C. | 0 | $0 | 0.00% | −1,283,555−100.0% | Sold out |
| Boxer Capital Management, LLC | 0 | $0 | 0.00% | −690,000−100.0% | Sold out |
| Finepoint Capital LP | 0 | $0 | 0.00% | −640,071−100.0% | Sold out |
| TD Asset Management Inc | 0 | $0 | 0.00% | −62,694−100.0% | Sold out |
| Rafferty Asset Management, LLC | 0 | $0 | 0.00% | −43,978−100.0% | Sold out |
| Corebridge Financial, Inc. | 0 | $0 | 0.00% | −20,831−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −14,036−100.0% | Sold out |
| Cresset Asset Management, LLC | 0 | $0 | 0.00% | −13,125−100.0% | Sold out |
| ProShare Advisors LLC | 0 | $0 | 0.00% | −11,632−100.0% | Sold out |
| Amundi | 0 | $0 | 0.00% | −2,014−100.0% | Sold out |