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 |
|---|---|---|---|---|---|
| FMR LLC | 7,901,218 | $48.0M | 0.00% | −40,184−0.5% | Reduced |
| BlackRock, Inc. | 3,939,398 | $23.9M | 0.00% | −102,903−2.5% | Reduced |
| ADAR1 Capital Management, LLC | 3,375,009 | $20.5M | 3.33% | +3,375,009 | New |
| Armistice Capital, LLC | 2,236,000 | $13.6M | 0.51% | +40,000+1.8% | Added |
| Vanguard Group Inc | 2,176,227 | $13.2M | 0.00% | +906,956+71.5% | Added |
| Palo Alto Investors LP | 1,274,753 | $7.74M | 1.65% | −384,981−23.2% | Reduced |
| Federated Hermes, Inc. | 1,181,087 | $7.17M | 0.01% | +634,832+116.2% | Added |
| Citadel Advisors LLC | 1,147,622 | $6.97M | 0.01% | +1,058,223+1,183.7% | Added |
| Acadian Asset Management LLC | 1,018,177 | $6.18M | 0.01% | +1,018,177 | New |
| State Street Corp | 1,005,002 | $6.10M | 0.00% | −516,362−33.9% | Reduced |
| Dimensional Fund Advisors LP | 962,339 | $5.84M | 0.00% | +99,191+11.5% | Added |
| Morgan Stanley | 953,256 | $5.79M | 0.00% | +233,268+32.4% | Added |
| Geode Capital Management, LLC | 933,446 | $5.67M | 0.00% | −81,346−8.0% | Reduced |
| Rangeley Capital, LLC | 715,367 | $4.34M | 5.47% | +715,367 | New |
| Jacobs Levy Equity Management, Inc | 693,154 | $4.21M | 0.02% | +674,601+3,636.1% | Added |
| Balyasny Asset Management LLC | 575,792 | $3.50M | 0.01% | +575,792 | New |
| Trexquant Investment LP | 552,826 | $3.36M | 0.04% | +552,826 | New |
| Goldman Sachs Group Inc | 528,323 | $3.21M | 0.00% | +17,861+3.5% | Added |
| Cubist Systematic Strategies, LLC | 501,764 | $3.05M | 0.03% | +501,764 | New |
| Rock Springs Capital Management LP | 492,601 | $2.99M | 0.19% | 00.0% | Unchanged |
| Granahan Investment Management Inc | 461,082 | $2.80M | 0.11% | +461,082 | New |
| Birchview Capital, LP | 451,019 | $2.74M | 2.72% | +118,045+35.5% | Added |
| Qube Research & Technologies Ltd | 414,828 | $2.52M | 0.00% | +414,828 | New |
| D. E. Shaw & Co., Inc. | 391,495 | $2.38M | 0.00% | +373,692+2,099.0% | Added |
| Mariner, LLC | 386,708 | $2.35M | 0.00% | +32,058+9.0% | Added |
| Northern Trust Corp | 334,554 | $2.03M | 0.00% | −39,149−10.5% | Reduced |
| Nordea Investment Management AB | 311,605 | $1.92M | 0.00% | +3,618+1.2% | Added |
| Schonfeld Strategic Advisors LLC | 307,341 | $1.87M | 0.01% | +307,341 | New |
| Charles Schwab Investment Management Inc | 275,084 | $1.67M | 0.00% | −44,523−13.9% | Reduced |
| Prosight Management, LP | 267,800 | $1.63M | 0.40% | −140,322−34.4% | Reduced |
| Bank of America Corp | 210,945 | $1.28M | 0.00% | +78,959+59.8% | Added |
| Gsa Capital Partners LLP | 210,555 | $1.28M | 0.09% | +210,555 | New |
| Squarepoint Ops LLC | 209,249 | $1.27M | 0.00% | +209,249 | New |
| Monimus Capital Management, LP | 206,475 | $1.25M | 1.01% | +206,475 | New |
| Two Sigma Investments, LP | 201,450 | $1.22M | 0.00% | +185,417+1,156.5% | Added |
| Millennium Management LLC | 170,579 | $1.04M | 0.00% | +118,112+225.1% | Added |
| DCF Advisers, LLC | 156,500 | $950.0K | 0.46% | −38,500−19.7% | Reduced |
| Ameriprise Financial Inc | 151,543 | $919.9K | 0.00% | +151,543 | New |
| Bank of New York Mellon Corp | 148,350 | $900.5K | 0.00% | +2,341+1.6% | Added |
| Two Sigma Advisers, LP | 139,800 | $848.6K | 0.00% | +139,800 | New |
| UBS Asset Management Americas Inc | 139,284 | $845.5K | 0.00% | −242,368−63.5% | Reduced |
| JPMorgan Chase & Co | 126,951 | $770.6K | 0.00% | −245,014−65.9% | Reduced |
| Nuveen, LLC | 122,155 | $741.5K | 0.00% | −27,806−18.5% | Reduced |
| Jane Street Group, LLC | 117,453 | $712.9K | 0.00% | −15,187−11.4% | Reduced |
| Barclays PLC | 115,848 | $703.2K | 0.00% | +32,467+38.9% | Added |
| Wellington Management Group LLP | 107,839 | $654.6K | 0.00% | −5,091,689−97.9% | Reduced |
| Royal Bank of Canada | 105,939 | $643.0K | 0.00% | +101,621+2,353.4% | Added |
| State of Wisconsin Investment Board | 103,996 | $631.3K | 0.00% | +103,996 | New |
| Russell Investments Group, Ltd. | 96,196 | $583.9K | 0.00% | +95,002+7,956.6% | Added |
| Susquehanna International Group, LLP | 91,950 | $558.1K | 0.00% | +14,707+19.0% | Added |
| Renaissance Technologies LLC | 90,200 | $547.5K | 0.00% | −149,700−62.4% | Reduced |
| Duncan Williams Asset Management, LLC | 88,339 | $536.2K | 0.17% | 00.0% | Unchanged |
| Alliancebernstein L.P. | 87,587 | $531.7K | 0.00% | +40,834+87.3% | Added |
| Hennion & Walsh Asset Management, Inc. | 86,154 | $523.0K | 0.02% | +8,517+11.0% | Added |
| Pinnacle Associates Ltd | 74,079 | $449.7K | 0.01% | −26,180−26.1% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 71,668 | $435.0K | 0.01% | +71,668 | New |
| Price T Rowe Associates Inc | 71,047 | $432.0K | 0.00% | −3,384,809−97.9% | Reduced |
| Monaco Asset Management SAM | 70,000 | $424.9K | 0.16% | +70,000 | New |
| Caption Management, LLC | 65,100 | $395.2K | 0.04% | +65,100 | New |
| Rhumbline Advisers | 63,005 | $382.4K | 0.00% | −3,074−4.7% | Reduced |
| UBS Group AG | 60,664 | $368.2K | 0.00% | −183,815−75.2% | Reduced |
| American Century Companies Inc | 59,965 | $364.0K | 0.00% | +25,129+72.1% | Added |
| Quantinno Capital Management LP | 59,618 | $361.9K | 0.00% | +59,618 | New |
| ExodusPoint Capital Management, LP | 58,918 | $358.0K | 0.00% | +17,646+42.8% | Added |
| Norges Bank | 57,454 | $348.7K | 0.00% | 00.0% | Unchanged |
| Swiss National Bank | 56,500 | $343.0K | 0.00% | −12,200−17.8% | Reduced |
| Franklin Resources Inc | 56,078 | $340.4K | 0.00% | +36,331+184.0% | Added |
| SG Americas Securities, LLC | 51,941 | $315.0K | 0.00% | −20,618−28.4% | Reduced |
| Creative Planning | 50,569 | $307.0K | 0.00% | +39,879+373.0% | Added |
| Quinn Opportunity Partners LLC | 50,000 | $303.5K | 0.03% | +50,000 | New |
| Citigroup Inc | 49,303 | $299.3K | 0.00% | −16,523−25.1% | Reduced |
| Algert Global LLC | 48,150 | $292.3K | 0.01% | +48,150 | New |
| BNP Paribas Arbitrage, SA | 46,844 | $284.3K | 0.00% | +37,267+389.1% | Added |
| HSBC Holdings PLC | 46,047 | $282.3K | 0.00% | +32,959+251.8% | Added |
| Massachusetts Financial Services Co | 44,364 | $269.3K | 0.00% | +548+1.3% | Added |
| Simplex Trading, LLC | 43,264 | $262.0K | 0.01% | +43,264 | New |
| Man Group plc | 42,752 | $259.5K | 0.00% | +25,752+151.5% | Added |
| Covestor Ltd | 42,295 | $257.0K | 0.15% | +42,291+1,057,275.0% | Added |
| Public Employees Retirement System of Ohio | 42,158 | $255.9K | 0.00% | +42,158 | New |
| PDT Partners, LLC | 41,281 | $250.6K | 0.01% | −109,035−72.5% | Reduced |
| Wells Fargo & Company | 41,220 | $250.2K | 0.00% | −4,669−10.2% | Reduced |
| Engineers Gate Manager LP | 40,967 | $248.7K | 0.00% | +40,967 | New |
| Deutsche Bank AG | 39,601 | $240.4K | 0.00% | −56,209−58.7% | Reduced |
| Thrivent Financial for Lutherans | 38,626 | $234.0K | 0.00% | 00.0% | Unchanged |
| Susquehanna Fundamental Investments, LLC | 37,591 | $228.2K | 0.01% | −37,181−49.7% | Reduced |
| Invesco Ltd. | 36,885 | $223.9K | 0.00% | −753−2.0% | Reduced |
| Graham Capital Management, L.P. | 34,042 | $206.6K | 0.01% | +34,042 | New |
| California State Teachers Retirement System | 33,243 | $201.8K | 0.00% | 00.0% | Unchanged |
| Dark Forest Capital Management LP | 32,866 | $199.5K | 0.01% | +11,807+56.1% | Added |
| Group One Trading, L.P. | 32,258 | $195.8K | 0.01% | +32,258 | New |
| Focused Wealth Management, Inc | 32,129 | $195.0K | 0.02% | 00.0% | Unchanged |
| RBF Capital, LLC | 29,200 | $177.2K | 0.01% | 00.0% | Unchanged |
| Alps Advisors Inc | 29,028 | $176.2K | 0.00% | −8,928−23.5% | Reduced |
| Tudor Investment Corp Et Al | 27,999 | $170.0K | 0.00% | +27,999 | New |
| Cambridge Investment Research Advisors, Inc. | 27,311 | $166.0K | 0.00% | +17,147+168.7% | Added |
| Sherbrooke Park Advisers LLC | 27,221 | $165.2K | 0.07% | +27,221 | New |
| MetLife Investment Management | 25,402 | $154.2K | 0.00% | 00.0% | Unchanged |
| Purkiss Capital Advisors LLC | 24,904 | $151.2K | 0.08% | +3,275+15.1% | Added |
| Edgewood Management LLC | 24,060 | $146.0K | 0.00% | 00.0% | Unchanged |
| Point72 (DIFC) Ltd | 23,946 | $145.4K | 0.01% | +23,946 | New |