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 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 |
|---|---|---|---|---|---|
| Harbour Investments, Inc. | 1 | $10 | 0.00% | 00.0% | Unchanged |
| Wealth Preservation Advisors, LLC | 1 | $10 | 0.00% | +1 | New |
| Clearstead Advisors, LLC | 4 | $39 | 0.00% | −6−60.0% | Reduced |
| Steward Partners Investment Advisory, LLC | 6 | $58 | 0.00% | 00.0% | Unchanged |
| MAI Capital Management | 10 | $98 | 0.00% | 00.0% | Unchanged |
| Key Financial Inc | 12 | $117 | 0.00% | 00.0% | Unchanged |
| IFP Advisors, Inc | 15 | $146 | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 15 | $146 | 0.00% | 00.0% | Unchanged |
| Caitong International Asset Management Co., Ltd | 20 | $194 | 0.00% | −3−13.0% | Reduced |
| Leo H. Evart, Inc. | 22 | $214 | 0.00% | +22 | New |
| CoreCap Advisors, LLC | 23 | $224 | 0.00% | 00.0% | Unchanged |
| Advisory Services Network, LLC | 30 | $292 | 0.00% | +30 | New |
| Ronald Blue Trust, Inc. | 33 | $321 | 0.00% | 00.0% | Unchanged |
| Root Financial Partners, LLC | 38 | $369 | 0.00% | +38 | New |
| Northwestern Mutual Wealth Management Co | 50 | $486 | 0.00% | −4−7.4% | Reduced |
| Cornerstone Financial Management LLC | 55 | $535 | 0.00% | +55 | New |
| Keating Financial Advisory Services, Inc. | 76 | $739 | 0.00% | +76 | New |
| SRS Capital Advisors, Inc. | 92 | $895 | 0.00% | +79+607.7% | Added |
| Harbor Investment Advisory, LLC | 100 | $972 | 0.00% | 00.0% | Unchanged |
| Gould Capital, LLC | 100 | $972 | 0.00% | 00.0% | Unchanged |
| True Wealth Design, LLC | 103 | $1.00K | 0.00% | 00.0% | Unchanged |
| CVA Family Office, LLC | 109 | $1.06K | 0.00% | +109 | New |
| Nisa Investment Advisors, LLC | 112 | $1.09K | 0.00% | 00.0% | Unchanged |
| Albion Financial Group | 125 | $1.22K | 0.00% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 131 | $1.27K | 0.00% | +131 | New |
| Johnson Financial Group, Inc. | 151 | $1.47K | 0.00% | 00.0% | Unchanged |
| Sittner & Nelson, LLC | 155 | $1.51K | 0.00% | −30−16.2% | Reduced |
| EverSource Wealth Advisors, LLC | 160 | $1.55K | 0.00% | +70+77.8% | Added |
| Larson Financial Group LLC | 167 | $1.62K | 0.00% | +141+542.3% | Added |
| Asset Dedication, LLC | 184 | $1.79K | 0.00% | 00.0% | Unchanged |
| Basecamp Wealth Advisors LLC | 197 | $1.92K | 0.00% | 00.0% | Unchanged |
| Evelyn Partners Investment Management LLP | 199 | $1.93K | 0.00% | 00.0% | Unchanged |
| Parallel Advisors, LLC | 296 | $2.88K | 0.00% | +117+65.4% | Added |
| Optiver Holding B.V. | 297 | $2.89K | 0.00% | +1+0.3% | Added |
| Aster Capital Management (DIFC) Ltd | 256 | $3.17K | 0.00% | +256 | New |
| Essential Partners LLC | 333 | $3.24K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 372 | $3.61K | 0.00% | +135+57.0% | Added |
| US Bancorp | 418 | $4.06K | 0.00% | +59+16.4% | Added |
| HM Payson & Co | 600 | $5.83K | 0.00% | 00.0% | Unchanged |
| Quadrant Capital Group LLC | 841 | $8.18K | 0.00% | −419−33.3% | Reduced |
| HighMark Wealth Management LLC | 900 | $8.75K | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 946 | $9.20K | 0.00% | +61+6.9% | Added |
| GF Fund Management Co. Ltd. | 1,199 | $11.7K | 0.00% | +142+13.4% | Added |
| Simplex Trading, LLC | 1,303 | $12.7K | 0.00% | −624−32.4% | Reduced |
| Sterling Capital Management LLC | 1,348 | $13.1K | 0.00% | −979−42.1% | Reduced |
| Federation des caisses Desjardins du Quebec | 2,000 | $19.4K | 0.00% | +1,000+100.0% | Added |
| GAMMA Investing LLC | 2,155 | $20.9K | 0.00% | +1,645+322.5% | Added |
| Versant Capital Management, Inc | 2,192 | $21.3K | 0.00% | +148+7.2% | Added |
| California State Teachers Retirement System | 2,383 | $23.2K | 0.00% | −327−12.1% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 2,808 | $27.3K | 0.00% | +192+7.3% | Added |
| Farther Finance Advisors, LLC | 2,734 | $27.4K | 0.00% | +300+12.3% | Added |
| Royal Bank of Canada | 3,171 | $30.0K | 0.00% | −1,256−28.4% | Reduced |
| Group One Trading, L.P. | 3,416 | $33.2K | 0.00% | +3,416 | New |
| Ameritas Investment Partners, Inc. | 3,428 | $33.3K | 0.00% | 00.0% | Unchanged |
| Legal & General Group Plc | 3,973 | $38.6K | 0.00% | −71−1.8% | Reduced |
| Tower Research Capital LLC (TRC) | 4,637 | $45.1K | 0.00% | +1,811+64.1% | Added |
| Signaturefd, LLC | 4,727 | $45.9K | 0.00% | +1,118+31.0% | Added |
| Brown Brothers Harriman & Co | 5,000 | $48.6K | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 5,613 | $54.6K | 0.00% | +1,023+22.3% | Added |
| Pinnacle Wealth Planning Services, Inc. | 5,668 | $55.1K | 0.01% | 00.0% | Unchanged |
| Public Employees Retirement Association of Colorado | 6,552 | $64.0K | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 8,150 | $79.2K | 0.00% | −4,168−33.8% | Reduced |
| New York State Common Retirement Fund | 8,979 | $87.3K | 0.00% | 00.0% | Unchanged |
| China Universal Asset Management Co., Ltd. | 9,553 | $92.9K | 0.01% | +781+8.9% | Added |
| 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 |
| Prudential Financial Inc | 10,025 | $97.4K | 0.00% | +10,025 | New |
| Savant Capital, LLC | 10,131 | $98.5K | 0.00% | +10,131 | New |
| CWM, LLC | 10,276 | $99.9K | 0.00% | +181+1.8% | Added |
| JBF Capital, Inc. | 10,285 | $100.0K | 0.01% | +10,285 | New |
| Inscription Capital, LLC | 10,480 | $101.9K | 0.01% | −172−1.6% | Reduced |
| ExodusPoint Capital Management, LP | 11,172 | $108.6K | 0.00% | −76,818−87.3% | Reduced |
| Intech Investment Management LLC | 11,874 | $115.4K | 0.00% | −8,727−42.4% | Reduced |
| Raymond James Financial Inc | 11,884 | $115.5K | 0.00% | −4,599−27.9% | Reduced |
| Commonwealth Equity Services, LLC | 11,930 | $116.0K | 0.00% | +11,930 | New |
| Manufacturers Life Insurance Company, The | 12,184 | $118.4K | 0.00% | −1,511−11.0% | Reduced |
| Schonfeld Strategic Advisors LLC | 12,399 | $120.5K | 0.00% | +12,399 | New |
| Police & Firemen's Retirement System of New Jersey | 12,453 | $121.0K | 0.00% | 00.0% | Unchanged |
| Cary Street Partners Financial LLC | 12,500 | $121.5K | 0.00% | 00.0% | Unchanged |
| Graham Capital Management, L.P. | 12,820 | $124.6K | 0.00% | −14,936−53.8% | Reduced |
| Mercer Global Advisors Inc | 13,094 | $127.3K | 0.00% | +13,094 | New |
| SG Americas Securities, LLC | 13,522 | $131.0K | 0.00% | −49,496−78.5% | Reduced |
| STRS Ohio | 14,700 | $142.9K | 0.00% | −2,900−16.5% | Reduced |
| Skopos Labs, Inc. | 14,993 | $145.7K | 0.00% | +2,946+24.5% | Added |
| Chicago Trust Co NA | 15,057 | $146.4K | 0.02% | +15,057 | New |
| State Board of Administration of Florida Retirement System | 15,386 | $149.6K | 0.00% | 00.0% | Unchanged |
| Ballentine Partners, LLC | 16,793 | $163.2K | 0.00% | −1,277−7.1% | Reduced |
| Chicago Partners Investment Group LLC | 15,365 | $164.7K | 0.00% | +143+0.9% | Added |
| SEI Investments Co | 17,248 | $167.6K | 0.00% | +17,248 | New |
| Susquehanna International Group, LLP | 17,792 | $172.9K | 0.00% | +1,817+11.4% | Added |
| Vanguard Global Advisers, LLC | 18,249 | $177.4K | 0.00% | +18,249 | New |
| Jones Financial Companies LLLP | 19,409 | $179.7K | 0.00% | +3,509+22.1% | Added |
| Foundation Wealth Management, LLC | 19,236 | $187.0K | 0.13% | +19,236 | New |
| MetLife Investment Management | 19,516 | $189.7K | 0.00% | −5,985−23.5% | Reduced |
| Mogy Joel R Investment Counsel Inc | 20,750 | $201.7K | 0.01% | 00.0% | Unchanged |
| Profund Advisors LLC | 24,005 | $233.3K | 0.01% | −6,611−21.6% | Reduced |
| Los Angeles Capital Management LLC | 24,419 | $237.4K | 0.00% | −70,987−74.4% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 24,639 | $237.7K | 0.00% | −601−2.4% | Reduced |
| Tudor Investment Corp Et Al | 24,471 | $237.9K | 0.00% | −2,002−7.6% | Reduced |
| Trexquant Investment LP | 24,543 | $238.6K | 0.00% | +5,159+26.6% | Added |