Prothena Corp.PRTA
13F holders, Q2 2026 (June 30)187holders +1
27new positions
23sold out
5famous investors
$9.84avg. 13F price*
At the end of Q2 2026, 187 institutions reported holding Prothena Corp. PLC (PRTA) in their 13F filings, up 1 from Q1 2026. 27 opened new positions and 23 sold out. The largest holders were FMR LLC ($70.5M), Rubric Capital Management LP ($49.0M) and BlackRock, Inc. ($47.7M). 5 famous investors held it, including David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Prothena Corp. PLC
- CUSIP
- G72800108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 27 | $9.3M |
| Exits | 23 | $14.9M |
All 13F filers, Q1 2026 → Q2 2026: 3,864,770 shares bought and 3,560,728 shares sold, net +304,042 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 187 holders
| FMR LLC | 0.00% | Reduce -4.7% | 7,199,218 | $70.5M |
| Rubric Capital Management LP | 0.45% | No change | 5,000,000 | $49.0M |
| BlackRock, Inc. | 0.00% | Add +4.8% | 4,867,955 | $47.7M |
| State Street Corp. | 0.00% | Add +23.5% | 2,393,424 | $23.4M |
| Acadian Asset Management LLC | 0.02% | Add +29.9% | 2,010,645 | $19.7M |
| Vanguard Portfolio Management LLC | 0.00% | Add +14.2% | 1,651,293 | $16.2M |
| D. E. Shaw & Co. | 0.01% | Reduce -8.6% | 1,611,457 | $15.8M |
| ADAR1 Capital Management, LLC | 0.72% | Reduce -1.7% | 1,554,535 | $15.2M |
| Two Sigma Investments, LP | 0.01% | Add +4.9% | 1,264,987 | $12.4M |
| Palo Alto Investors LP | 1.55% | Reduce -5.4% | 1,143,155 | $11.2M |
| Geode Capital Management, LLC | 0.00% | Add +2.5% | 1,125,877 | $11.0M |
| Federated Hermes, Inc. | 0.02% | Add +2.3% | 1,084,401 | $10.6M |
| Morgan Stanley | 0.00% | Reduce -19.1% | 995,348 | $9.7M |
| Goldman Sachs Group Inc. | 0.00% | Add +19.6% | 979,730 | $9.6M |
| Jacobs Levy Equity Management, Inc. | 0.03% | Reduce -0.6% | 965,988 | $9.5M |
| Dimensional Fund Advisors LP | 0.00% | Add +15.7% | 905,651 | $8.9M |
| Qube Research & Technologies Ltd | 0.01% | Add +28.7% | 791,169 | $7.7M |
| Renaissance Technologies | 0.01% | Add +14.8% | 697,615 | $6.8M |
| Man Group plc | 0.01% | Add +77.7% | 678,116 | $6.6M |
| Mariner, LLC | 0.01% | Add +11.0% | 625,095 | $6.1M |
| Nuveen, LLC | 0.00% | Reduce -26.6% | 557,157 | $5.5M |
| Vanguard Capital Management LLC | 0.00% | Reduce -0.9% | 479,945 | $4.7M |
| Northern Trust Corp. | 0.00% | Add +23.7% | 457,124 | $4.5M |
| Birchview Capital, LP | 2.06% | No change | 449,019 | $4.4M |
| Rangeley Capital, LLC | 4.02% | Reduce -7.2% | 417,270 | $4.1M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -0.2% | 355,896 | $3.5M |
| Citadel Advisors | 0.00% | Reduce -22.2% | 338,810 | $3.3M |
| Monimus Capital Management, LP | 0.82% | Reduce -32.2% | 329,052 | $3.2M |
| BNP Paribas Financial Markets | 0.00% | Reduce -25.6% | 315,803 | $3.1M |
| AQR Capital Management | 0.00% | Add +48.3% | 302,572 | $3.0M |
| Penbrook Management LLC | 1.70% | No change | 271,720 | $2.7M |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +1.8% | 259,064 | $2.5M |
| UBS Group AG | 0.00% | Reduce -26.5% | 241,425 | $2.4M |
| Mackenzie Financial Corp. | 0.00% | New | 239,899 | $2.3M |
| Coppell Advisory Solutions LLC | 0.19% | New | 12 | $2.3M |
| Squarepoint Ops LLC | 0.00% | Reduce -3.0% | 223,971 | $2.2M |
| Bank of America Corp. | 0.00% | Reduce -47.1% | 208,246 | $2.0M |
| Focused Wealth Management, Inc | 0.18% | Add +0.0% | 207,445 | $2.0M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | Add +22.4% | 191,693 | $1.9M |
| Marshall Wace, LLP | 0.00% | Add +328.1% | 190,834 | $1.9M |
| Quantinno Capital Management LP | 0.00% | Add +9.7% | 158,331 | $1.6M |
| Diadema Partners LP | 0.55% | New | 149,482 | $1.5M |
| Bank of New York Mellon Corp | 0.00% | Reduce -1.8% | 133,906 | $1.3M |
| Massachusetts Financial Services Co. | 0.00% | Reduce -3.8% | 126,990 | $1.2M |
| Russell Investments Group, Ltd. | 0.00% | Add +21.1% | 121,901 | $1.2M |
| T. Rowe Price Associates Inc. | 0.00% | Add +14.2% | 109,252 | $1.1M |
| Hennion & Walsh Asset Management, Inc. | 0.03% | Add +2.5% | 90,795 | $889K |
| American Century Companies Inc. | 0.00% | Add +13.8% | 90,644 | $887K |
| Ameriprise Financial Inc. | 0.00% | Reduce -2.2% | 87,215 | $854K |
| XTX Topco Ltd | 0.01% | Reduce -7.2% | 85,717 | $839K |
| Susquehanna Portfolio Strategies, LLC | 0.01% | Add +21.9% | 82,710 | $810K |
| ExodusPoint Capital Management, LP | 0.01% | Add +634.2% | 82,023 | $803K |
| Martingale Asset Management L P | 0.02% | Add +14.0% | 78,800 | $771K |
| Trexquant Investment LP | 0.00% | Add +212.6% | 76,731 | $751K |
| DCF Advisers, LLC | 0.19% | No change | 73,247 | $717K |
| Invesco Ltd. | 0.00% | Add +43.5% | 71,479 | $700K |
| State of Wisconsin Investment Board | 0.00% | New | 70,326 | $688K |
| Duncan Williams Asset Management, LLC | 0.16% | No change | 70,281 | $688K |
| Alliancebernstein L.P. | 0.00% | Reduce -0.6% | 69,217 | $673K |
| Campbell & CO Investment Adviser LLC | 0.04% | Reduce -52.1% | 68,345 | $669K |
| Assenagon Asset Management S.A. | 0.00% | Reduce -18.2% | 62,785 | $615K |
| Creative Planning | 0.00% | Reduce -14.2% | 62,620 | $613K |
| Pinnacle Associates Ltd. | 0.01% | Reduce -4.5% | 57,918 | $567K |
| Citigroup Inc. | 0.00% | Add +609.5% | 57,827 | $566K |
| Rhumbline Advisers | 0.00% | Add +1.0% | 55,896 | $547K |
| Schonfeld Strategic Advisors LLC | 0.00% | Add +306.1% | 50,350 | $493K |
| HSBC Holdings PLC | 0.00% | Reduce -23.8% | 49,569 | $492K |
| Quinn Opportunity Partners LLC | 0.02% | No change | 50,000 | $490K |
| Edgewood Management LLC | 0.01% | No change | 50,000 | $490K |
| Wells Fargo & Company | 0.00% | Add +81.2% | 49,520 | $485K |
| Seven Fleet Capital Management LP | 0.07% | No change | 43,300 | $424K |
| Deutsche Bank AG | 0.00% | Add +8.1% | 43,270 | $424K |
| Public Employees Retirement System of Ohio | 0.00% | No change | 42,158 | $413K |
| Engineers Gate Manager LP | 0.01% | New | 41,270 | $404K |
| Rafferty Asset Management, LLC | 0.00% | Reduce -24.2% | 40,397 | $395K |
| Virtus Investment Advisers, LLC | 0.09% | Add +50.7% | 39,660 | $388K |
| Shelton Capital Management | 0.01% | New | 39,472 | $386K |
| Persistent Asset Partners Ltd | 0.12% | New | 38,100 | $373K |
| Barclays PLC | 0.00% | Reduce -7.9% | 37,623 | $368K |
| Sei Investments Co. | 0.00% | Add +79.0% | 30,877 | $302K |
| WINTON GROUP Ltd | 0.01% | Reduce -12.1% | 30,500 | $299K |
| RBF Capital, LLC | 0.01% | No change | 29,200 | $286K |
| Great Lakes Advisors, LLC | 0.00% | Reduce -2.9% | 28,733 | $281K |
| PNC Financial Services Group, Inc. | 0.00% | No change | 28,386 | $278K |
| JPMorgan Chase & Co. | 0.00% | Add +2.5% | 26,620 | $265K |
| MetLife Investment Management, LLC | 0.00% | Add +32.7% | 25,890 | $253K |
| Aquatic Capital Management LLC | 0.01% | New | 25,419 | $249K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +2.2% | 25,174 | $247K |
| Covestor Ltd | 0.14% | Reduce -22.9% | 25,190 | $246K |
| Purkiss Capital Advisors LLC | 0.09% | No change | 25,086 | $246K |
| Tudor Investment Corporation | 0.00% | Reduce -0.1% | 24,445 | $239K |
| Canada Pension Plan Investment Board | 0.00% | New | 24,000 | $235K |
| Envestnet Asset Management Inc. | 0.00% | New | 22,908 | $224K |
| Mogy Joel R Investment Counsel Inc. | 0.01% | No change | 20,750 | $203K |
| Profund Advisors LLC | 0.01% | Reduce -14.3% | 20,570 | $201K |
| Jones Financial Companies LLLP | 0.00% | Add +0.1% | 19,430 | $195K |
| Savant Capital, LLC | 0.00% | Add +92.5% | 19,503 | $190K |
| Foundation Wealth Management, LLC | 0.12% | No change | 19,236 | $188K |
| Graham Capital Management, L.P. | 0.01% | Add +44.3% | 18,496 | $181K |
| Vanguard Global Advisers, LLC | 0.00% | No change | 18,249 | $179K |
"% of holder's portfolio" is PRTA's weight in each manager's 13F, not the share of Prothena Corp. PLC the manager owns.