Prothena Corp.PRTA
13F holders, Q3 2025 (September 30)187holders −1
31new positions
31sold out
7famous investors
$9.76avg. 13F price*
At the end of Q3 2025, 187 institutions reported holding Prothena Corp. PLC (PRTA) in their 13F filings, down 1 from Q2 2025. 31 opened new positions and 31 sold out. The largest holders were FMR LLC ($77.1M), BlackRock, Inc. ($35.1M) and Vanguard Group Inc. ($20.0M). 7 famous investors held it, including Steve Cohen (0.0% of Point72 Asset Management's portfolio), David E. Shaw (0.0% of D. E. Shaw & Co.'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 Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 31 | $36.5M |
| Exits | 31 | $12.1M |
All 13F filers, Q2 2025 → Q3 2025: 9,885,047 shares bought and 8,965,710 shares sold, net +919,337 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 187 holders
| FMR LLC | 0.00% | No change | 7,901,218 | $77.1M |
| BlackRock, Inc. | 0.00% | Reduce -8.7% | 3,598,417 | $35.1M |
| Vanguard Group Inc. | 0.00% | Reduce -5.8% | 2,049,849 | $20.0M |
| Armistice Capital, LLC | 0.56% | Reduce -18.4% | 1,824,000 | $17.8M |
| Rubric Capital Management LP | 0.20% | New | 1,540,373 | $15.0M |
| ADAR1 Capital Management, LLC | 1.43% | Reduce -56.5% | 1,469,098 | $14.3M |
| Palo Alto Investors LP | 2.39% | Add +3.9% | 1,324,028 | $12.9M |
| D. E. Shaw & Co. | 0.01% | Add +236.0% | 1,315,418 | $12.8M |
| Acadian Asset Management LLC | 0.02% | Add +21.7% | 1,239,242 | $12.1M |
| Geode Capital Management, LLC | 0.00% | Add +9.2% | 1,019,483 | $10.0M |
| State Street Corp. | 0.00% | Reduce -10.3% | 901,038 | $8.8M |
| Jacobs Levy Equity Management, Inc. | 0.03% | Add +26.5% | 876,528 | $8.6M |
| Dimensional Fund Advisors LP | 0.00% | Reduce -16.1% | 806,988 | $7.9M |
| Morgan Stanley | 0.00% | Reduce -16.1% | 799,674 | $7.8M |
| Citadel Advisors | 0.01% | Reduce -33.2% | 767,105 | $7.5M |
| JPMorgan Chase & Co. | 0.00% | Add +479.6% | 735,765 | $7.2M |
| Federated Hermes, Inc. | 0.01% | Reduce -41.3% | 692,818 | $6.8M |
| Nuveen, LLC | 0.00% | Add +447.1% | 668,290 | $6.5M |
| Arrowstreet Capital, Limited Partnership | 0.00% | New | 654,294 | $6.4M |
| Point72 Asset Management | 0.01% | New | 646,746 | $6.3M |
| Millennium Management | 0.01% | Add +264.1% | 621,099 | $6.1M |
| Jane Street Group, LLC | 0.01% | Add +427.7% | 619,792 | $6.0M |
| Mariner, LLC | 0.01% | Add +52.8% | 590,897 | $5.8M |
| Rangeley Capital, LLC | 5.26% | Reduce -21.6% | 560,457 | $5.5M |
| Birchview Capital, LP | 4.05% | Add +21.7% | 549,019 | $5.4M |
| Algert Global LLC | 0.07% | Add +825.9% | 445,811 | $4.4M |
| Two Sigma Investments, LP | 0.01% | Add +111.8% | 426,605 | $4.2M |
| UBS Group AG | 0.00% | Add +560.8% | 400,847 | $3.9M |
| Renaissance Technologies | 0.00% | Add +311.6% | 371,300 | $3.6M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -33.1% | 353,221 | $3.4M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +27.5% | 350,821 | $3.4M |
| Northern Trust Corp. | 0.00% | Add +0.0% | 334,657 | $3.3M |
| Trexquant Investment LP | 0.03% | Reduce -49.5% | 278,979 | $2.7M |
| Bank of America Corp. | 0.00% | Add +31.4% | 277,096 | $2.7M |
| Two Sigma Advisers, LP | 0.01% | Add +90.1% | 265,700 | $2.6M |
| Monimus Capital Management, LP | 1.87% | Add +25.0% | 258,056 | $2.5M |
| Qube Research & Technologies Ltd | 0.00% | Reduce -38.7% | 254,245 | $2.5M |
| BNP Paribas Financial Markets | 0.00% | Add +386.7% | 228,010 | $2.2M |
| AQR Capital Management | 0.00% | New | 214,542 | $2.1M |
| DCF Advisers, LLC | 0.74% | Add +28.3% | 200,747 | $2.0M |
| Cubist Systematic Strategies, LLC | 0.03% | Reduce -61.9% | 190,949 | $1.9M |
| Jump Financial, LLC | 0.02% | New | 186,247 | $1.8M |
| Susquehanna International Group, LLP | 0.00% | Add +71.2% | 157,447 | $1.5M |
| Bank of New York Mellon Corp | 0.00% | Add +3.7% | 153,800 | $1.5M |
| Man Group plc | 0.00% | Add +208.7% | 131,973 | $1.3M |
| Russell Investments Group, Ltd. | 0.00% | Add +32.8% | 127,757 | $1.2M |
| Squarepoint Ops LLC | 0.00% | Reduce -39.3% | 127,033 | $1.2M |
| Los Angeles Capital Management LLC | 0.00% | Add +615.0% | 119,424 | $1.2M |
| Janney Montgomery Scott LLC | 0.00% | New | 106,898 | $1.0M |
| Ameriprise Financial Inc. | 0.00% | Reduce -30.4% | 105,536 | $1.0M |
| Quantinno Capital Management LP | 0.00% | Add +69.7% | 101,187 | $988K |
| Barclays PLC | 0.00% | Reduce -15.3% | 98,075 | $957K |
| Assenagon Asset Management S.A. | 0.00% | New | 89,704 | $876K |
| Duncan Williams Asset Management, LLC | 0.24% | No change | 88,339 | $862K |
| Hennion & Walsh Asset Management, Inc. | 0.03% | Reduce -1.8% | 84,598 | $826K |
| T. Rowe Price Associates Inc. | 0.00% | Add +10.6% | 78,547 | $767K |
| American Century Companies Inc. | 0.00% | Add +20.5% | 72,239 | $705K |
| Pinnacle Associates Ltd. | 0.01% | Reduce -3.8% | 71,261 | $696K |
| Monaco Asset Management SAM | 0.26% | No change | 70,000 | $683K |
| Alliancebernstein L.P. | 0.00% | Reduce -20.5% | 69,607 | $679K |
| Creative Planning | 0.00% | Add +26.8% | 64,140 | $626K |
| Rhumbline Advisers | 0.00% | Reduce -1.5% | 62,042 | $606K |
| Franklin Resources Inc. | 0.00% | Add +9.1% | 61,172 | $597K |
| Caption Management, LLC | 0.04% | Reduce -6.3% | 61,009 | $595K |
| Focused Wealth Management, Inc | 0.06% | Add +77.8% | 57,129 | $558K |
| SG Americas Securities, LLC | 0.00% | Add +9.2% | 56,719 | $554K |
| Engineers Gate Manager LP | 0.01% | Add +36.9% | 56,080 | $547K |
| Balyasny Asset Management L.P. | 0.00% | Reduce -90.3% | 55,764 | $544K |
| Graham Capital Management, L.P. | 0.03% | Add +56.8% | 53,393 | $521K |
| Quinn Opportunity Partners LLC | 0.04% | No change | 50,000 | $488K |
| Massachusetts Financial Services Co. | 0.00% | Add +7.0% | 47,489 | $463K |
| Fox Run Management, L.L.C. | 0.07% | New | 44,332 | $433K |
| Public Employees Retirement System of Ohio | 0.00% | No change | 42,158 | $411K |
| Simplex Trading, LLC | 0.01% | Reduce -2.8% | 42,044 | $410K |
| Wells Fargo & Company | 0.00% | Reduce -1.9% | 40,430 | $395K |
| HSBC Holdings PLC | 0.00% | Reduce -18.7% | 37,432 | $365K |
| Deutsche Bank AG | 0.00% | Reduce -14.7% | 33,773 | $330K |
| Covestor Ltd | 0.17% | Reduce -25.7% | 31,432 | $307K |
| Invesco Ltd. | 0.00% | Reduce -15.1% | 31,303 | $306K |
| HRT Financial LP | 0.00% | New | 31,106 | $303K |
| ExodusPoint Capital Management, LP | 0.00% | Reduce -48.6% | 30,254 | $295K |
| Proficio Capital Partners LLC | 0.02% | New | 30,136 | $294K |
| Boothbay Fund Management, LLC | 0.01% | New | 30,000 | $293K |
| Arizona PSPRS Trust | 0.01% | New | 27,700 | $293K |
| Sandia Investment Management LP | 0.89% | New | 29,950 | $292K |
| RBF Capital, LLC | 0.01% | No change | 29,200 | $285K |
| Susquehanna Portfolio Strategies, LLC | 0.00% | Reduce -59.6% | 28,975 | $283K |
| STRS Ohio | 0.00% | Add +75.6% | 28,800 | $281K |
| Cambridge Investment Research Advisors, Inc. | 0.00% | Add +0.7% | 27,513 | $269K |
| Quadrature Capital Ltd | 0.00% | Add +14.6% | 27,215 | $265K |
| Tudor Investment Corporation | 0.00% | Reduce -3.3% | 27,073 | $264K |
| Alps Advisors Inc. | 0.00% | Reduce -11.4% | 25,727 | $251K |
| Rock Springs Capital Management LP | 0.01% | Reduce -94.8% | 25,398 | $248K |
| Purkiss Capital Advisors LLC | 0.12% | Add +1.9% | 25,386 | $248K |
| Edgewood Management LLC | 0.00% | No change | 24,060 | $235K |
| Virtus Investment Advisers, LLC | 0.06% | Add +21.0% | 22,443 | $219K |
| Raymond James Financial Inc. | 0.00% | Add +63.3% | 22,032 | $215K |
| Atom Investors LP | 0.02% | New | 21,315 | $208K |
| Handelsbanken Fonder AB | 0.00% | No change | 20,900 | $204K |
| Mogy Joel R Investment Counsel Inc. | 0.01% | No change | 20,750 | $203K |
"% of holder's portfolio" is PRTA's weight in each manager's 13F, not the share of Prothena Corp. PLC the manager owns.