Prothena Corp.PRTA
13F holders, Q2 2025 (June 30)188holders +27
51new positions
22sold out
5famous investors
$6.07avg. 13F price*
At the end of Q2 2025, 188 institutions reported holding Prothena Corp. PLC (PRTA) in their 13F filings, up 27 from Q1 2025. 51 opened new positions and 22 sold out. The largest holders were FMR LLC ($48.0M), BlackRock, Inc. ($23.9M) and ADAR1 Capital Management, LLC ($20.5M). 5 famous investors held it, including Ken Griffin (0.0% of Citadel Advisors's portfolio), David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio) and Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio).
- Company
- Prothena Corp. PLC
- CUSIP
- G72800108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 51 | $59.5M |
| Exits | 22 | $177.8M |
All 13F filers, Q1 2025 → Q2 2025: 15,030,657 shares bought and 25,576,487 shares sold, net −10,545,830 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 188 holders
| FMR LLC | 0.00% | Reduce -0.5% | 7,901,218 | $48.0M |
| BlackRock, Inc. | 0.00% | Reduce -2.5% | 3,939,398 | $23.9M |
| ADAR1 Capital Management, LLC | 3.36% | New | 3,375,009 | $20.5M |
| Armistice Capital, LLC | 0.51% | Add +1.8% | 2,236,000 | $13.6M |
| Vanguard Group Inc. | 0.00% | Add +71.5% | 2,176,227 | $13.2M |
| Palo Alto Investors LP | 1.65% | Reduce -23.2% | 1,274,753 | $7.7M |
| Federated Hermes, Inc. | 0.01% | Add +116.2% | 1,181,087 | $7.2M |
| Citadel Advisors | 0.01% | Add +1183.7% | 1,147,622 | $7.0M |
| Acadian Asset Management LLC | 0.01% | New | 1,018,177 | $6.2M |
| State Street Corp. | 0.00% | Reduce -33.9% | 1,005,002 | $6.1M |
| Dimensional Fund Advisors LP | 0.00% | Add +11.5% | 962,339 | $5.8M |
| Morgan Stanley | 0.00% | Add +32.4% | 953,256 | $5.8M |
| Geode Capital Management, LLC | 0.00% | Reduce -8.0% | 933,446 | $5.7M |
| Rangeley Capital, LLC | 5.65% | New | 715,367 | $4.3M |
| Jacobs Levy Equity Management, Inc. | 0.02% | Add +3636.1% | 693,154 | $4.2M |
| Balyasny Asset Management L.P. | 0.01% | New | 575,792 | $3.5M |
| Trexquant Investment LP | 0.04% | New | 552,826 | $3.4M |
| Goldman Sachs Group Inc. | 0.00% | Add +3.5% | 528,323 | $3.2M |
| Cubist Systematic Strategies, LLC | 0.03% | New | 501,764 | $3.0M |
| Rock Springs Capital Management LP | 0.19% | No change | 492,601 | $3.0M |
| Granahan Investment Management, LLC | 0.11% | New | 461,082 | $2.8M |
| Birchview Capital, LP | 2.72% | Add +35.5% | 451,019 | $2.7M |
| Qube Research & Technologies Ltd | 0.00% | New | 414,828 | $2.5M |
| D. E. Shaw & Co. | 0.00% | Add +2099.0% | 391,495 | $2.4M |
| Mariner, LLC | 0.00% | Add +9.0% | 386,708 | $2.3M |
| Northern Trust Corp. | 0.00% | Reduce -10.5% | 334,554 | $2.0M |
| Nordea Investment Management AB | 0.00% | Add +1.2% | 311,605 | $1.9M |
| Schonfeld Strategic Advisors LLC | 0.01% | New | 307,341 | $1.9M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -13.9% | 275,084 | $1.7M |
| Prosight Management, LP | 0.40% | Reduce -34.4% | 267,800 | $1.6M |
| Bank of America Corp. | 0.00% | Add +59.8% | 210,945 | $1.3M |
| Gsa Capital Partners LLP | 0.09% | New | 210,555 | $1.3M |
| Squarepoint Ops LLC | 0.00% | New | 209,249 | $1.3M |
| Monimus Capital Management, LP | 1.01% | New | 206,475 | $1.3M |
| Two Sigma Investments, LP | 0.00% | Add +1156.5% | 201,450 | $1.2M |
| Millennium Management | 0.00% | Add +225.1% | 170,579 | $1.0M |
| DCF Advisers, LLC | 0.46% | Reduce -19.7% | 156,500 | $950K |
| Ameriprise Financial Inc. | 0.00% | New | 151,543 | $920K |
| Bank of New York Mellon Corp | 0.00% | Add +1.6% | 148,350 | $900K |
| Two Sigma Advisers, LP | 0.00% | New | 139,800 | $849K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -63.5% | 139,284 | $845K |
| JPMorgan Chase & Co. | 0.00% | Reduce -65.9% | 126,951 | $771K |
| Nuveen, LLC | 0.00% | Reduce -18.5% | 122,155 | $741K |
| Jane Street Group, LLC | 0.00% | Reduce -11.4% | 117,453 | $713K |
| Barclays PLC | 0.00% | Add +38.9% | 115,848 | $703K |
| Wellington Management Group LLP | 0.00% | Reduce -97.9% | 107,839 | $655K |
| Royal Bank of Canada | 0.00% | Add +2353.4% | 105,939 | $643K |
| State of Wisconsin Investment Board | 0.00% | New | 103,996 | $631K |
| Russell Investments Group, Ltd. | 0.00% | Add +7956.6% | 96,196 | $584K |
| Susquehanna International Group, LLP | 0.00% | Add +19.0% | 91,950 | $558K |
| Renaissance Technologies | 0.00% | Reduce -62.4% | 90,200 | $548K |
| Duncan Williams Asset Management, LLC | 0.17% | No change | 88,339 | $536K |
| Alliancebernstein L.P. | 0.00% | Add +87.3% | 87,587 | $532K |
| Hennion & Walsh Asset Management, Inc. | 0.02% | Add +11.0% | 86,154 | $523K |
| Pinnacle Associates Ltd. | 0.01% | Reduce -26.1% | 74,079 | $450K |
| Susquehanna Portfolio Strategies, LLC | 0.01% | New | 71,668 | $435K |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -97.9% | 71,047 | $432K |
| Monaco Asset Management SAM | 0.16% | New | 70,000 | $425K |
| Caption Management, LLC | 0.04% | New | 65,100 | $395K |
| Rhumbline Advisers | 0.00% | Reduce -4.7% | 63,005 | $382K |
| UBS Group AG | 0.00% | Reduce -75.2% | 60,664 | $368K |
| American Century Companies Inc. | 0.00% | Add +72.1% | 59,965 | $364K |
| Quantinno Capital Management LP | 0.00% | New | 59,618 | $362K |
| ExodusPoint Capital Management, LP | 0.00% | Add +42.8% | 58,918 | $358K |
| Norges Bank | 0.00% | No change | 57,454 | $349K |
| Swiss National Bank | 0.00% | Reduce -17.8% | 56,500 | $343K |
| Franklin Resources Inc. | 0.00% | Add +184.0% | 56,078 | $340K |
| SG Americas Securities, LLC | 0.00% | Reduce -28.4% | 51,941 | $315K |
| Creative Planning | 0.00% | Add +373.1% | 50,569 | $307K |
| Quinn Opportunity Partners LLC | 0.03% | New | 50,000 | $304K |
| Citigroup Inc. | 0.00% | Reduce -25.1% | 49,303 | $299K |
| Algert Global LLC | 0.01% | New | 48,150 | $292K |
| BNP Paribas Financial Markets | 0.00% | Add +389.1% | 46,844 | $284K |
| HSBC Holdings PLC | 0.00% | Add +251.8% | 46,047 | $282K |
| Massachusetts Financial Services Co. | 0.00% | Add +1.3% | 44,364 | $269K |
| Simplex Trading, LLC | 0.01% | New | 43,264 | $262K |
| Man Group plc | 0.00% | Add +151.5% | 42,752 | $260K |
| Covestor Ltd | 0.15% | Add +1057275.0% | 42,295 | $257K |
| Public Employees Retirement System of Ohio | 0.00% | New | 42,158 | $256K |
| PDT Partners, LLC | 0.01% | Reduce -72.5% | 41,281 | $251K |
| Wells Fargo & Company | 0.00% | Reduce -10.2% | 41,220 | $250K |
| Engineers Gate Manager LP | 0.00% | New | 40,967 | $249K |
| Deutsche Bank AG | 0.00% | Reduce -58.7% | 39,601 | $240K |
| Thrivent Financial for Lutherans | 0.00% | No change | 38,626 | $234K |
| Susquehanna Fundamental Investments, LLC | 0.01% | Reduce -49.7% | 37,591 | $228K |
| Invesco Ltd. | 0.00% | Reduce -2.0% | 36,885 | $224K |
| Graham Capital Management, L.P. | 0.01% | New | 34,042 | $207K |
| California State Teachers Retirement System | 0.00% | No change | 33,243 | $202K |
| Dark Forest Capital Management LP | 0.01% | Add +56.1% | 32,866 | $199K |
| Group One Trading LLC | 0.01% | New | 32,258 | $196K |
| Focused Wealth Management, Inc | 0.02% | No change | 32,129 | $195K |
| RBF Capital, LLC | 0.01% | No change | 29,200 | $177K |
| Alps Advisors Inc. | 0.00% | Reduce -23.5% | 29,028 | $176K |
| Tudor Investment Corporation | 0.00% | New | 27,999 | $170K |
| Cambridge Investment Research Advisors, Inc. | 0.00% | Add +168.7% | 27,311 | $166K |
| Sherbrooke Park Advisers LLC | 0.07% | New | 27,221 | $165K |
| MetLife Investment Management, LLC | 0.00% | No change | 25,402 | $154K |
| Purkiss Capital Advisors LLC | 0.08% | Add +15.1% | 24,904 | $151K |
| Edgewood Management LLC | 0.00% | No change | 24,060 | $146K |
| Point72 (DIFC) Ltd | 0.01% | New | 23,946 | $145K |
"% of holder's portfolio" is PRTA's weight in each manager's 13F, not the share of Prothena Corp. PLC the manager owns.