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, Q3 2021
Institutional positions in Prothena Corp Public Ltd Co as of Sep 30, 2021. 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
- +37 vs. Q2 2021
- Shares held
- 40.9M
- +504.5K (+1.2%) vs. Q2 2021
- Total value
- $2.92B
- +$837.8M (+40.3%) vs. Q2 2021
- New holders
- 50
- 57 more added
- Sold out
- 13
- 49 more reduced
1 institution that held it in Q2 2021 haven't filed for Q3 2021 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2021: 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, Q3 2021
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q2 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 11,284,280 | $803.8M | 28.39% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 6,062,629 | $431.8M | 0.04% | +239,544+4.1% | Added |
| BlackRock Inc. | 3,769,704 | $268.5M | 0.01% | +87,856+2.4% | Added |
| FMR LLC | 2,649,431 | $188.7M | 0.01% | −128,856−4.6% | Reduced |
| Palo Alto Investors LP | 1,685,282 | $120.0M | 7.25% | −46,200−2.7% | Reduced |
| Dimensional Fund Advisors LP | 1,579,648 | $112.5M | 0.04% | −5,713−0.4% | Reduced |
| First Light Asset Management, LLC | 1,449,494 | $103.2M | 6.80% | −478,335−24.8% | Reduced |
| State Street Corp | 1,405,244 | $100.1M | 0.01% | +176,765+14.4% | Added |
| Redmile Group, LLC | 901,491 | $64.2M | 1.12% | −314,166−25.8% | Reduced |
| Vanguard Group Inc | 868,478 | $61.9M | 0.00% | +187,382+27.5% | Added |
| Rock Springs Capital Management LP | 710,430 | $50.6M | 1.06% | −239,661−25.2% | Reduced |
| Geode Capital Management, LLC | 620,173 | $44.2M | 0.01% | +56,817+10.1% | Added |
| Nuveen Asset Management, LLC | 479,395 | $34.1M | 0.01% | +29,404+6.5% | Added |
| Two Sigma Advisers, LP | 473,700 | $33.7M | 0.09% | +51,400+12.2% | Added |
| Northern Trust Corp | 440,985 | $31.4M | 0.01% | −299−0.1% | Reduced |
| Invesco Ltd. | 347,424 | $24.7M | 0.01% | +51,565+17.4% | Added |
| Prosight Management, LP | 323,300 | $23.0M | 13.47% | −98,700−23.4% | Reduced |
| Two Sigma Investments, LP | 321,166 | $22.9M | 0.06% | −15,824−4.7% | Reduced |
| Boxer Capital, LLC | 300,000 | $21.4M | 0.75% | +300,000 | New |
| UBS Asset Management Americas Inc | 279,823 | $19.9M | 0.01% | −122,345−30.4% | Reduced |
| Renaissance Technologies LLC | 257,200 | $18.3M | 0.02% | +18,900+7.9% | Added |
| Charles Schwab Investment Management Inc | 241,715 | $17.2M | 0.01% | +34,889+16.9% | Added |
| Atika Capital Management LLC | 224,600 | $16.0M | 1.14% | −9,400−4.0% | Reduced |
| Point72 Asset Management, L.P. | 161,900 | $11.5M | 0.05% | −6,900−4.1% | Reduced |
| Pinnacle Associates Ltd | 151,776 | $10.8M | 0.20% | −54,142−26.3% | Reduced |
| Millennium Management LLC | 151,669 | $10.8M | 0.01% | +63,725+72.5% | Added |
| Prudential Financial Inc | 144,449 | $10.3M | 0.01% | +87,270+152.6% | Added |
| Bank of New York Mellon Corp | 137,287 | $9.78M | 0.00% | +1,832+1.4% | Added |
| Voloridge Investment Management, LLC | 127,257 | $9.06M | 0.06% | +51,596+68.2% | Added |
| TD Asset Management Inc | 126,894 | $9.04M | 0.01% | +4,125+3.4% | Added |
| Federated Hermes, Inc. | 124,667 | $8.88M | 0.02% | +80,996+185.5% | Added |
| Parametric Portfolio Associates LLC | 124,221 | $8.85M | 0.01% | +30,344+32.3% | Added |
| SG Americas Securities, LLC | 116,076 | $8.27M | 0.05% | +106,056+1,058.4% | Added |
| Handelsbanken Fonder AB | 109,700 | $7.81M | 0.04% | +10,000+10.0% | Added |
| Citadel Advisors LLC | 103,505 | $7.37M | 0.01% | +103,505 | New |
| Adage Capital Partners GP, L.L.C. | 100,000 | $7.12M | 0.01% | −100,000−50.0% | Reduced |
| Perceptive Advisors LLC | 100,000 | $7.12M | 0.10% | 00.0% | Unchanged |
| Hillsdale Investment Management Inc. | 93,500 | $6.66M | 0.51% | +41,700+80.5% | Added |
| UBS Group AG | 77,517 | $5.52M | 0.00% | +75,855+4,564.1% | Added |
| Goldman Sachs Group Inc | 75,909 | $5.41M | 0.00% | +2,645+3.6% | Added |
| Marshall Wace, LLP | 68,892 | $4.91M | 0.02% | +68,892 | New |
| Swiss National Bank | 68,300 | $4.87M | 0.00% | +6,700+10.9% | Added |
| EAM Investors, LLC | 64,650 | $4.61M | 0.78% | −39,900−38.2% | Reduced |
| Morgan Stanley | 62,180 | $4.43M | 0.00% | +17,240+38.4% | Added |
| Platinum Investment Management Ltd | 60,512 | $4.31M | 0.12% | −41,393−40.6% | Reduced |
| DCF Advisers, LLC | 60,000 | $4.27M | 2.32% | −1,750−2.8% | Reduced |
| Wells Fargo & Company | 56,331 | $4.01M | 0.00% | +41,215+272.7% | Added |
| Alps Advisors Inc | 55,206 | $3.93M | 0.04% | −2,674−4.6% | Reduced |
| Citigroup Inc | 53,285 | $3.80M | 0.00% | −3,067−5.4% | Reduced |
| EAM Global Investors LLC | 49,720 | $3.54M | 0.84% | −20,535−29.2% | Reduced |
| State of Wisconsin Investment Board | 45,800 | $3.26M | 0.01% | −3,200−6.5% | Reduced |
| RBF Capital, LLC | 45,362 | $3.23M | 0.18% | 00.0% | Unchanged |
| Granahan Investment Management Inc | 45,304 | $3.23M | 0.06% | +45,304 | New |
| Alliancebernstein L.P. | 44,940 | $3.20M | 0.00% | −4,600−9.3% | Reduced |
| State of New Jersey Common Pension Fund D | 44,541 | $3.17M | 0.01% | +44,541 | New |
| Rhumbline Advisers | 44,414 | $3.16M | 0.00% | +1,975+4.7% | Added |
| California State Teachers Retirement System | 44,191 | $3.15M | 0.00% | −2,831−6.0% | Reduced |
| Jacobs Levy Equity Management, Inc | 43,227 | $3.08M | 0.02% | +43,227 | New |
| ETF Managers Group, LLC | 43,230 | $3.06M | 0.06% | +43,230 | New |
| Massachusetts Financial Services Co | 42,706 | $3.04M | 0.00% | −562−1.3% | Reduced |
| Cubist Systematic Strategies, LLC | 42,262 | $3.01M | 0.04% | +14,732+53.5% | Added |
| Rafferty Asset Management, LLC | 40,797 | $2.91M | 0.02% | +6,621+19.4% | Added |
| Birchview Capital, LP | 40,247 | $2.87M | 1.95% | +10,000+33.1% | Added |
| Marshall Wace North America L.P. | 34,755 | $2.47M | 0.01% | +34,755 | New |
| Syntal Capital Partners, LLC | 33,615 | $2.39M | 0.83% | +33,615 | New |
| Bank of America Corp | 33,574 | $2.39M | 0.00% | +17,431+108.0% | Added |
| D. E. Shaw & Co., Inc. | 33,321 | $2.37M | 0.00% | +13,026+64.2% | Added |
| Deutsche Bank AG | 31,648 | $2.25M | 0.00% | +10,036+46.4% | Added |
| Principal Financial Group Inc | 31,575 | $2.25M | 0.00% | +46+0.1% | Added |
| Susquehanna Fundamental Investments, LLC | 30,150 | $2.15M | 0.04% | 00.0% | Unchanged |
| Jump Financial, LLC | 27,800 | $1.98M | 0.14% | +27,800 | New |
| Tudor Investment Corp Et Al | 27,280 | $1.94M | 0.04% | −12,779−31.9% | Reduced |
| Susquehanna International Group, LLP | 26,456 | $1.88M | 0.00% | +14,061+113.4% | Added |
| New York State Common Retirement Fund | 26,360 | $1.88M | 0.00% | −3,750−12.5% | Reduced |
| Credit Suisse AG | 25,232 | $1.80M | 0.00% | +2,803+12.5% | Added |
| Edgewood Management LLC | 25,000 | $1.78M | 0.00% | 00.0% | Unchanged |
| New York Life Investments Alternatives | 24,849 | $1.77M | 1.15% | −7,255−22.6% | Reduced |
| Ensign Peak Advisors, Inc | 22,162 | $1.58M | 0.00% | +4,534+25.7% | Added |
| Bank of Montreal | 21,525 | $1.56M | 0.00% | +21,525 | New |
| M&G Investment Management Ltd | 20,004 | $1.42M | 0.01% | +20,004 | New |
| Advisory Research Inc | 19,684 | $1.40M | 0.09% | +19,684 | New |
| Alpha DNA Investment Management LLC | 19,389 | $1.38M | 0.97% | +19,389 | New |
| American International Group, Inc. | 19,130 | $1.36M | 0.01% | +23+0.1% | Added |
| Gotham Asset Management, LLC | 18,173 | $1.29M | 0.05% | +12,836+240.5% | Added |
| Barclays PLC | 18,036 | $1.28M | 0.00% | +9,676+115.7% | Added |
| Bellwether Advisors, LLC | 17,846 | $1.27M | 0.42% | +17,846 | New |
| Los Angeles Capital Management LLC | 17,645 | $1.26M | 0.01% | −16,850−48.8% | Reduced |
| Manufacturers Life Insurance Company, The | 17,283 | $1.23M | 0.00% | −1,371−7.3% | Reduced |
| Robeco Institutional Asset Management B.V. | 16,960 | $1.21M | 0.00% | +16,960 | New |
| State Board of Administration of Florida Retirement System | 16,211 | $1.16M | 0.00% | +180+1.1% | Added |
| Seven Eight Capital, LP | 14,800 | $1.05M | 0.10% | +14,800 | New |
| JPMorgan Chase & Co | 14,286 | $1.02M | 0.00% | −1,042−6.8% | Reduced |
| Jennison Associates LLC | 14,271 | $1.02M | 0.00% | +14,271 | New |
| ProShare Advisors LLC | 14,101 | $1.00M | 0.00% | −2,684−16.0% | Reduced |
| Legal & General Group Plc | 14,082 | $1.00M | 0.00% | +6,095+76.3% | Added |
| Voya Investment Management LLC | 13,767 | $980.0K | 0.00% | +282+2.1% | Added |
| STRS Ohio | 13,700 | $975.0K | 0.00% | +12,600+1,145.5% | Added |
| AQR Capital Management LLC | 13,346 | $951.0K | 0.00% | +8,429+171.4% | Added |
| Royal Bank of Canada | 13,022 | $928.0K | 0.00% | −44,090−77.2% | Reduced |
| Jane Street Group, LLC | 12,949 | $922.0K | 0.00% | +12,949 | New |