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, Q1 2023
Institutional positions in Prothena Corp Public Ltd Co as of Mar 31, 2023. 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
- 192
- −4 vs. Q4 2022
- Shares held
- 51.7M
- +2.40M (+4.9%) vs. Q4 2022
- Total value
- $2.51B
- −$459.0M (−15.4%) vs. Q4 2022
- New holders
- 27
- 70 more added
- Sold out
- 31
- 56 more reduced
5 institutions that held it in Q4 2022 haven't filed for Q1 2023 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2022: 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, Q1 2023
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q4 2022.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 11,584,280 | $561.5M | 18.10% | 00.0% | Unchanged |
| FMR LLC | 6,762,025 | $327.8M | 0.03% | +2,814,753+71.3% | Added |
| BlackRock Inc. | 3,624,627 | $175.7M | 0.01% | +139,559+4.0% | Added |
| Price T Rowe Associates Inc | 3,202,293 | $155.2M | 0.02% | −3,610−0.1% | Reduced |
| Wellington Management Group LLP | 2,266,078 | $109.8M | 0.02% | +501,185+28.4% | Added |
| State Street Corp | 2,102,458 | $101.9M | 0.01% | +50,498+2.5% | Added |
| Palo Alto Investors LP | 1,663,777 | $80.6M | 6.68% | +5,200+0.3% | Added |
| Janus Henderson Group PLC | 1,596,303 | $77.4M | 0.05% | +163,980+11.4% | Added |
| First Light Asset Management, LLC | 1,511,168 | $73.2M | 6.60% | −24,431−1.6% | Reduced |
| Dimensional Fund Advisors LP | 1,232,635 | $59.7M | 0.02% | −87,866−6.7% | Reduced |
| Avidity Partners Management LP | 1,068,200 | $51.8M | 1.72% | −1,884,800−63.8% | Reduced |
| Vanguard Group Inc | 944,556 | $45.8M | 0.00% | +74,422+8.6% | Added |
| T. Rowe Price Investment Management, Inc. | 914,683 | $44.3M | 0.03% | −13,276−1.4% | Reduced |
| Geode Capital Management, LLC | 779,824 | $37.8M | 0.00% | +64,223+9.0% | Added |
| PFM Health Sciences, LP | 774,546 | $37.5M | 1.73% | −100,918−11.5% | Reduced |
| Rock Springs Capital Management LP | 753,462 | $36.5M | 0.87% | 00.0% | Unchanged |
| Bank of America Corp | 564,441 | $27.4M | 0.00% | +442,770+363.9% | Added |
| Nuveen Asset Management, LLC | 506,728 | $24.6M | 0.01% | −66,062−11.5% | Reduced |
| Prosight Management, LP | 447,092 | $21.7M | 10.38% | +117,092+35.5% | Added |
| Eventide Asset Management, LLC | 438,732 | $21.3M | 0.39% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 407,300 | $19.7M | 0.03% | −67,600−14.2% | Reduced |
| Northern Trust Corp | 382,688 | $18.5M | 0.00% | +21,103+5.8% | Added |
| Two Sigma Advisers, LP | 381,300 | $18.5M | 0.05% | +54,300+16.6% | Added |
| Two Sigma Investments, LP | 365,539 | $17.7M | 0.05% | +162,104+79.7% | Added |
| Point72 Asset Management, L.P. | 334,993 | $16.2M | 0.06% | +23,493+7.5% | Added |
| Finepoint Capital LP | 331,600 | $16.1M | 6.14% | +8,700+2.7% | Added |
| JPMorgan Chase & Co | 327,718 | $15.9M | 0.00% | −76,833−19.0% | Reduced |
| Boxer Capital, LLC | 300,000 | $14.5M | 0.71% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 298,971 | $14.5M | 0.00% | −1,879−0.6% | Reduced |
| Maple Rock Capital Partners Inc. | 293,584 | $14.2M | 1.39% | −105,830−26.5% | Reduced |
| Morgan Stanley | 284,907 | $13.8M | 0.00% | +104,504+57.9% | Added |
| Perceptive Advisors LLC | 237,646 | $11.5M | 0.34% | 00.0% | Unchanged |
| Granahan Investment Management Inc | 232,628 | $11.3M | 0.34% | +32,702+16.4% | Added |
| UBS Asset Management Americas Inc | 226,202 | $11.0M | 0.01% | −2,166−0.9% | Reduced |
| Goldman Sachs Group Inc | 225,077 | $10.9M | 0.00% | +9,022+4.2% | Added |
| Norges Bank | 218,814 | $10.6M | 0.00% | +159,555+269.3% | Added |
| Millennium Management LLC | 194,639 | $9.43M | 0.01% | −18,971−8.9% | Reduced |
| Bank of New York Mellon Corp | 164,092 | $7.95M | 0.00% | +27,095+19.8% | Added |
| Rafferty Asset Management, LLC | 141,689 | $6.87M | 0.05% | +3,336+2.4% | Added |
| Pinnacle Associates Ltd | 135,281 | $6.56M | 0.13% | −2,290−1.7% | Reduced |
| Birchview Capital, LP | 128,395 | $6.22M | 4.87% | +1,200+0.9% | Added |
| Frazier Life Sciences Management, L.P. | 127,900 | $6.20M | 0.45% | 00.0% | Unchanged |
| Ensign Peak Advisors, Inc | 125,622 | $6.09M | 0.01% | +200+0.2% | Added |
| Sectoral Asset Management Inc | 122,750 | $5.95M | 1.14% | +7,550+6.6% | Added |
| Man Group plc | – | $5.71M | 0.02% | – | – |
| Citigroup Inc | 114,800 | $5.56M | 0.01% | +51,400+81.1% | Added |
| SG Americas Securities, LLC | 109,401 | $5.30M | 0.07% | +30,629+38.9% | Added |
| Mariner, LLC | 107,107 | $5.19M | 0.02% | +80,180+297.8% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 89,424 | $4.33M | 0.02% | +28,992+48.0% | Added |
| DCF Advisers, LLC | 84,250 | $4.08M | 3.01% | +10,150+13.7% | Added |
| Squarepoint Ops LLC | 78,309 | $3.80M | 0.03% | +72,793+1,319.7% | Added |
| TD Asset Management Inc | 74,706 | $3.62M | 0.00% | −6,807−8.4% | Reduced |
| Swiss National Bank | 73,100 | $3.54M | 0.00% | −6,200−7.8% | Reduced |
| Hillsdale Investment Management Inc. | 65,000 | $3.15M | 0.27% | −12,500−16.1% | Reduced |
| Barclays PLC | 64,604 | $3.13M | 0.00% | −14,735−18.6% | Reduced |
| EAM Global Investors LLC | 63,120 | $3.06M | 0.86% | −13,533−17.7% | Reduced |
| UBS Group AG | 61,643 | $2.99M | 0.00% | −29,426−32.3% | Reduced |
| Susquehanna International Group, LLP | 61,391 | $2.98M | 0.00% | +50,673+472.8% | Added |
| Manufacturers Life Insurance Company, The | 56,966 | $2.76M | 0.00% | +1,904+3.5% | Added |
| BNP Paribas Arbitrage, SA | 56,025 | $2.72M | 0.01% | +30,614+120.5% | Added |
| Rhumbline Advisers | 55,844 | $2.71M | 0.00% | +6,126+12.3% | Added |
| Principal Financial Group Inc | 54,869 | $2.66M | 0.00% | −1,138−2.0% | Reduced |
| RBF Capital, LLC | 54,362 | $2.63M | 0.19% | 00.0% | Unchanged |
| Handelsbanken Fonder AB | 52,000 | $2.52M | 0.01% | 00.0% | Unchanged |
| Putnam Investments LLC | 50,905 | $2.47M | 0.00% | −14,489−22.2% | Reduced |
| Jennison Associates LLC | 49,233 | $2.39M | 0.00% | −80.0% | Reduced |
| Atika Capital Management LLC | 48,578 | $2.35M | 0.37% | −42,600−46.7% | Reduced |
| Wells Fargo & Company | 47,320 | $2.29M | 0.00% | +36,655+343.7% | Added |
| Alliancebernstein L.P. | 44,866 | $2.17M | 0.00% | 00.0% | Unchanged |
| State of New Jersey Common Pension Fund D | 44,559 | $2.16M | 0.01% | +6,959+18.5% | Added |
| California State Teachers Retirement System | 44,308 | $2.15M | 0.00% | +1,088+2.5% | Added |
| Trexquant Investment LP | 42,200 | $2.05M | 0.06% | +10,963+35.1% | Added |
| Credit Suisse AG | 41,715 | $2.02M | 0.00% | +2,828+7.3% | Added |
| Platinum Investment Management Ltd | 41,508 | $2.01M | 0.07% | 00.0% | Unchanged |
| Cubist Systematic Strategies, LLC | 40,900 | $1.98M | 0.02% | +181+0.4% | Added |
| Voya Investment Management LLC | 38,547 | $1.87M | 0.00% | +547+1.4% | Added |
| Moody Aldrich Partners LLC | 37,761 | $1.83M | 0.37% | −1,476−3.8% | Reduced |
| Citadel Advisors LLC | 37,701 | $1.83M | 0.00% | +37,452+15,041.0% | Added |
| Legal & General Group Plc | 36,359 | $1.76M | 0.00% | +19,325+113.4% | Added |
| EAM Investors, LLC | 36,156 | $1.75M | 0.34% | −17,190−32.2% | Reduced |
| Alps Advisors Inc | 34,634 | $1.68M | 0.01% | +1,858+5.7% | Added |
| Jump Financial, LLC | 32,971 | $1.60M | 0.07% | +32,971 | New |
| New York State Common Retirement Fund | 31,575 | $1.53M | 0.00% | −4,205−11.8% | Reduced |
| State of Wisconsin Investment Board | 31,189 | $1.51M | 0.00% | −1,806−5.5% | Reduced |
| Thornburg Investment Management Inc | 29,643 | $1.44M | 0.02% | +5,369+22.1% | Added |
| Tudor Investment Corp Et Al | 29,008 | $1.41M | 0.03% | +29,008 | New |
| Macquarie Group Ltd | 28,569 | $1.39M | 0.00% | 00.0% | Unchanged |
| Invesco Ltd. | 28,352 | $1.37M | 0.00% | −13,952−33.0% | Reduced |
| Deutsche Bank AG | 27,351 | $1.33M | 0.00% | +5,453+24.9% | Added |
| Ergoteles LLC | 26,911 | $1.30M | 0.05% | +11,386+73.3% | Added |
| Canada Pension Plan Investment Board | 26,800 | $1.30M | 0.00% | +26,800 | New |
| Profund Advisors LLC | 26,531 | $1.29M | 0.08% | +26,531 | New |
| Edgewood Management LLC | 24,060 | $1.17M | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global Investments Co., Ltd. | 23,818 | $1.15M | 0.00% | +7,114+42.6% | Added |
| Fred Alger Management, LLC | 21,319 | $1.03M | 0.01% | +21,319 | New |
| First Trust Advisors LP | 21,108 | $1.02M | 0.00% | −41,288−66.2% | Reduced |
| Gsa Capital Partners LLP | 20,861 | $1.01M | 0.10% | +20,861 | New |
| MetLife Investment Management | 20,550 | $996.1K | 0.01% | +989+5.1% | Added |
| Victory Capital Management Inc | 19,611 | $950.5K | 0.00% | +10,193+108.2% | Added |
| Jane Street Group, LLC | 19,393 | $940.0K | 0.00% | +19,393 | New |