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 5 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 2026
Institutional positions in Prothena Corp Public Ltd Co as of Mar 31, 2026. 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
- 186
- +7 vs. Q4 2025
- Shares held
- 47.3M
- +2.17M (+4.8%) vs. Q4 2025
- Total value
- $459.5M
- +$28.4M (+6.6%) vs. Q4 2025
- New holders
- 30
- 68 more added
- Sold out
- 23
- 50 more reduced
3 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: 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 2026
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| State Board of Administration of Florida Retirement System | 15,386 | $149.6K | 0.00% | 00.0% | Unchanged |
| Chicago Trust Co NA | 15,057 | $146.4K | 0.02% | +15,057 | New |
| Skopos Labs, Inc. | 14,993 | $145.7K | 0.00% | +2,946+24.5% | Added |
| STRS Ohio | 14,700 | $142.9K | 0.00% | −2,900−16.5% | Reduced |
| SG Americas Securities, LLC | 13,522 | $131.0K | 0.00% | −49,496−78.5% | Reduced |
| Mercer Global Advisors Inc | 13,094 | $127.3K | 0.00% | +13,094 | New |
| Graham Capital Management, L.P. | 12,820 | $124.6K | 0.00% | −14,936−53.8% | Reduced |
| Cary Street Partners Financial LLC | 12,500 | $121.5K | 0.00% | 00.0% | Unchanged |
| Police & Firemen's Retirement System of New Jersey | 12,453 | $121.0K | 0.00% | 00.0% | Unchanged |
| Schonfeld Strategic Advisors LLC | 12,399 | $120.5K | 0.00% | +12,399 | New |
| Manufacturers Life Insurance Company, The | 12,184 | $118.4K | 0.00% | −1,511−11.0% | Reduced |
| Commonwealth Equity Services, LLC | 11,930 | $116.0K | 0.00% | +11,930 | New |
| Raymond James Financial Inc | 11,884 | $115.5K | 0.00% | −4,599−27.9% | Reduced |
| Intech Investment Management LLC | 11,874 | $115.4K | 0.00% | −8,727−42.4% | Reduced |
| ExodusPoint Capital Management, LP | 11,172 | $108.6K | 0.00% | −76,818−87.3% | Reduced |
| Inscription Capital, LLC | 10,480 | $101.9K | 0.01% | −172−1.6% | Reduced |
| JBF Capital, Inc. | 10,285 | $100.0K | 0.01% | +10,285 | New |
| CWM, LLC | 10,276 | $99.9K | 0.00% | +181+1.8% | Added |
| Savant Capital, LLC | 10,131 | $98.5K | 0.00% | +10,131 | New |
| Prudential Financial Inc | 10,025 | $97.4K | 0.00% | +10,025 | New |
| Vontobel Holding Ltd. | 10,000 | $97.2K | 0.00% | +10,000 | New |
| Cresset Asset Management, LLC | 10,000 | $97.2K | 0.00% | +10,000 | New |
| China Universal Asset Management Co., Ltd. | 9,553 | $92.9K | 0.01% | +781+8.9% | Added |
| New York State Common Retirement Fund | 8,979 | $87.3K | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 8,150 | $79.2K | 0.00% | −4,168−33.8% | Reduced |
| Public Employees Retirement Association of Colorado | 6,552 | $64.0K | 0.00% | 00.0% | Unchanged |
| Pinnacle Wealth Planning Services, Inc. | 5,668 | $55.1K | 0.01% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 5,613 | $54.6K | 0.00% | +1,023+22.3% | Added |
| Brown Brothers Harriman & Co | 5,000 | $48.6K | 0.00% | 00.0% | Unchanged |
| Signaturefd, LLC | 4,727 | $45.9K | 0.00% | +1,118+31.0% | Added |
| Tower Research Capital LLC (TRC) | 4,637 | $45.1K | 0.00% | +1,811+64.1% | Added |
| Legal & General Group Plc | 3,973 | $38.6K | 0.00% | −71−1.8% | Reduced |
| Ameritas Investment Partners, Inc. | 3,428 | $33.3K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 3,416 | $33.2K | 0.00% | +3,416 | New |
| Royal Bank of Canada | 3,171 | $30.0K | 0.00% | −1,256−28.4% | Reduced |
| Farther Finance Advisors, LLC | 2,734 | $27.4K | 0.00% | +300+12.3% | Added |
| Mirae Asset Global Investments Co., Ltd. | 2,808 | $27.3K | 0.00% | +192+7.3% | Added |
| California State Teachers Retirement System | 2,383 | $23.2K | 0.00% | −327−12.1% | Reduced |
| Versant Capital Management, Inc | 2,192 | $21.3K | 0.00% | +148+7.2% | Added |
| GAMMA Investing LLC | 2,155 | $20.9K | 0.00% | +1,645+322.5% | Added |
| Federation des caisses Desjardins du Quebec | 2,000 | $19.4K | 0.00% | +1,000+100.0% | Added |
| Sterling Capital Management LLC | 1,348 | $13.1K | 0.00% | −979−42.1% | Reduced |
| Simplex Trading, LLC | 1,303 | $12.7K | 0.00% | −624−32.4% | Reduced |
| GF Fund Management Co. Ltd. | 1,199 | $11.7K | 0.00% | +142+13.4% | Added |
| Allworth Financial LP | 946 | $9.20K | 0.00% | +61+6.9% | Added |
| HighMark Wealth Management LLC | 900 | $8.75K | 0.00% | 00.0% | Unchanged |
| Quadrant Capital Group LLC | 841 | $8.18K | 0.00% | −419−33.3% | Reduced |
| HM Payson & Co | 600 | $5.83K | 0.00% | 00.0% | Unchanged |
| US Bancorp | 418 | $4.06K | 0.00% | +59+16.4% | Added |
| Advisor Group Holdings, Inc. | 372 | $3.61K | 0.00% | +135+57.0% | Added |
| Essential Partners LLC | 333 | $3.24K | 0.00% | 00.0% | Unchanged |
| Aster Capital Management (DIFC) Ltd | 256 | $3.17K | 0.00% | +256 | New |
| Optiver Holding B.V. | 297 | $2.89K | 0.00% | +1+0.3% | Added |
| Parallel Advisors, LLC | 296 | $2.88K | 0.00% | +117+65.4% | Added |
| Evelyn Partners Investment Management LLP | 199 | $1.93K | 0.00% | 00.0% | Unchanged |
| Basecamp Wealth Advisors LLC | 197 | $1.92K | 0.00% | 00.0% | Unchanged |
| Asset Dedication, LLC | 184 | $1.79K | 0.00% | 00.0% | Unchanged |
| Larson Financial Group LLC | 167 | $1.62K | 0.00% | +141+542.3% | Added |
| EverSource Wealth Advisors, LLC | 160 | $1.55K | 0.00% | +70+77.8% | Added |
| Sittner & Nelson, LLC | 155 | $1.51K | 0.00% | −30−16.2% | Reduced |
| Johnson Financial Group, Inc. | 151 | $1.47K | 0.00% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 131 | $1.27K | 0.00% | +131 | New |
| Albion Financial Group | 125 | $1.22K | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 112 | $1.09K | 0.00% | 00.0% | Unchanged |
| CVA Family Office, LLC | 109 | $1.06K | 0.00% | +109 | New |
| True Wealth Design, LLC | 103 | $1.00K | 0.00% | 00.0% | Unchanged |
| Harbor Investment Advisory, LLC | 100 | $972 | 0.00% | 00.0% | Unchanged |
| Gould Capital, LLC | 100 | $972 | 0.00% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 92 | $895 | 0.00% | +79+607.7% | Added |
| Keating Financial Advisory Services, Inc. | 76 | $739 | 0.00% | +76 | New |
| Cornerstone Financial Management LLC | 55 | $535 | 0.00% | +55 | New |
| Northwestern Mutual Wealth Management Co | 50 | $486 | 0.00% | −4−7.4% | Reduced |
| Root Financial Partners, LLC | 38 | $369 | 0.00% | +38 | New |
| Ronald Blue Trust, Inc. | 33 | $321 | 0.00% | 00.0% | Unchanged |
| Advisory Services Network, LLC | 30 | $292 | 0.00% | +30 | New |
| CoreCap Advisors, LLC | 23 | $224 | 0.00% | 00.0% | Unchanged |
| Leo H. Evart, Inc. | 22 | $214 | 0.00% | +22 | New |
| Caitong International Asset Management Co., Ltd | 20 | $194 | 0.00% | −3−13.0% | Reduced |
| IFP Advisors, Inc | 15 | $146 | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 15 | $146 | 0.00% | 00.0% | Unchanged |
| Key Financial Inc | 12 | $117 | 0.00% | 00.0% | Unchanged |
| MAI Capital Management | 10 | $98 | 0.00% | 00.0% | Unchanged |
| Steward Partners Investment Advisory, LLC | 6 | $58 | 0.00% | 00.0% | Unchanged |
| Clearstead Advisors, LLC | 4 | $39 | 0.00% | −6−60.0% | Reduced |
| Harbour Investments, Inc. | 1 | $10 | 0.00% | 00.0% | Unchanged |
| Wealth Preservation Advisors, LLC | 1 | $10 | 0.00% | +1 | New |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −427,400−100.0% | Sold out |
| Arrowstreet Capital, Limited Partnership | 0 | $0 | 0.00% | −298,101−100.0% | Sold out |
| Diadema Partners LP | 0 | $0 | 0.00% | −106,539−100.0% | Sold out |
| Caption Management, LLC | 0 | $0 | 0.00% | −61,009−100.0% | Sold out |
| Franklin Resources Inc | 0 | $0 | 0.00% | −47,251−100.0% | Sold out |
| DekaBank Deutsche Girozentrale | 0 | $0 | 0.00% | −14,000−100.0% | Sold out |
| Quadrature Capital Ltd | 0 | $0 | 0.00% | −31,090−100.0% | Sold out |
| Persistent Asset Partners Ltd | 0 | $0 | 0.00% | −28,589−100.0% | Sold out |
| Polymer Capital Management (US) LLC | 0 | $0 | 0.00% | −23,513−100.0% | Sold out |
| Headlands Technologies LLC | 0 | $0 | 0.00% | −23,352−100.0% | Sold out |
| Millennium Management LLC | 0 | $0 | 0.00% | −21,976−100.0% | Sold out |
| Atom Investors LP | 0 | $0 | 0.00% | −17,026−100.0% | Sold out |
| Entropy Technologies, LP | 0 | $0 | 0.00% | −16,900−100.0% | Sold out |
| DRW Securities, LLC | 0 | $0 | 0.00% | −11,955−100.0% | Sold out |