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, Q4 2025
Institutional positions in Prothena Corp Public Ltd Co as of Dec 31, 2025. 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
- 182
- 0 vs. Q3 2025
- Shares held
- 47.3M
- +4.86M (+11.5%) vs. Q3 2025
- Total value
- $451.6M
- +$37.8M (+9.1%) vs. Q3 2025
- New holders
- 25
- 62 more added
- Sold out
- 25
- 57 more reduced
5 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Resources Management Corp | 3 | $0 | 0.00% | +3 | New |
| Harbour Investments, Inc. | 1 | $10 | 0.00% | 00.0% | Unchanged |
| New Millennium Group LLC | 1 | $10 | 0.00% | +1 | New |
| Steward Partners Investment Advisory, LLC | 6 | $57 | 0.00% | 00.0% | Unchanged |
| Clearstead Advisors, LLC | 10 | $96 | 0.00% | −11−52.4% | Reduced |
| MAI Capital Management | 10 | $96 | 0.00% | +10 | New |
| Key Financial Inc | 12 | $115 | 0.00% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 13 | $124 | 0.00% | −5,371−99.8% | Reduced |
| SBI Securities Co., Ltd. | 15 | $143 | 0.00% | −14−48.3% | Reduced |
| IFP Advisors, Inc | 15 | $143 | 0.00% | 00.0% | Unchanged |
| CoreCap Advisors, LLC | 23 | $220 | 0.00% | 00.0% | Unchanged |
| Caitong International Asset Management Co., Ltd | 23 | $220 | 0.00% | +23 | New |
| Larson Financial Group LLC | 26 | $248 | 0.00% | +20+333.3% | Added |
| Ronald Blue Trust, Inc. | 33 | $315 | 0.00% | 00.0% | Unchanged |
| CIBC Private Wealth Group, LLC | 48 | $458 | 0.00% | 00.0% | Unchanged |
| Northwestern Mutual Wealth Management Co | 54 | $516 | 0.00% | +4+8.0% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 71 | $678 | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 90 | $860 | 0.00% | 00.0% | Unchanged |
| Harbor Investment Advisory, LLC | 100 | $955 | 0.00% | 00.0% | Unchanged |
| Gould Capital, LLC | 100 | $955 | 0.00% | 00.0% | Unchanged |
| True Wealth Design, LLC | 103 | $984 | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 112 | $1.07K | 0.00% | −480−81.1% | Reduced |
| Albion Financial Group | 125 | $1.19K | 0.00% | 00.0% | Unchanged |
| Johnson Financial Group, Inc. | 151 | $1.44K | 0.00% | 00.0% | Unchanged |
| Sittner & Nelson, LLC | 185 | $1.65K | 0.00% | +30+19.4% | Added |
| Parallel Advisors, LLC | 179 | $1.71K | 0.00% | 00.0% | Unchanged |
| Asset Dedication, LLC | 184 | $1.76K | 0.00% | 00.0% | Unchanged |
| Basecamp Wealth Advisors LLC | 197 | $1.88K | 0.00% | +197 | New |
| Evelyn Partners Investment Management LLP | 199 | $1.90K | 0.00% | 00.0% | Unchanged |
| Daiwa Securities Group Inc. | 195 | $2.00K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 237 | $2.26K | 0.00% | −6−2.5% | Reduced |
| Optiver Holding B.V. | 296 | $2.83K | 0.00% | −56−15.9% | Reduced |
| Essential Partners LLC | 333 | $3.18K | 0.00% | 00.0% | Unchanged |
| US Bancorp | 359 | $3.43K | 0.00% | +45+14.3% | Added |
| GAMMA Investing LLC | 510 | $4.87K | 0.00% | +124+32.1% | Added |
| HM Payson & Co | 600 | $5.73K | 0.00% | 00.0% | Unchanged |
| Torren Management, LLC | 884 | $8.44K | 0.00% | +884 | New |
| Allworth Financial LP | 885 | $8.45K | 0.00% | +20+2.3% | Added |
| HighMark Wealth Management LLC | 900 | $8.60K | 0.00% | −1,108−55.2% | Reduced |
| Federation des caisses Desjardins du Quebec | 1,000 | $9.55K | 0.00% | +1,000 | New |
| GF Fund Management Co. Ltd. | 1,057 | $10.1K | 0.00% | −98−8.5% | Reduced |
| Quadrant Capital Group LLC | 1,260 | $12.0K | 0.00% | 00.0% | Unchanged |
| Amalgamated Bank | 1,383 | $13.0K | 0.00% | −57−4.0% | Reduced |
| Flagship Wealth Advisors, LLC | 1,500 | $14.3K | 0.00% | 00.0% | Unchanged |
| Simplex Trading, LLC | 1,927 | $18.4K | 0.00% | −40,117−95.4% | Reduced |
| Versant Capital Management, Inc | 2,044 | $19.5K | 0.00% | 00.0% | Unchanged |
| Sterling Capital Management LLC | 2,327 | $22.2K | 0.00% | −220−8.6% | Reduced |
| Farther Finance Advisors, LLC | 2,434 | $23.2K | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global Investments Co., Ltd. | 2,616 | $25.0K | 0.00% | +535+25.7% | Added |
| California State Teachers Retirement System | 2,710 | $25.9K | 0.00% | +295+12.2% | Added |
| Tower Research Capital LLC (TRC) | 2,826 | $27.0K | 0.00% | +1,541+119.9% | Added |
| Ameritas Investment Partners, Inc. | 3,428 | $32.7K | 0.00% | 00.0% | Unchanged |
| Signaturefd, LLC | 3,609 | $34.5K | 0.00% | −61−1.7% | Reduced |
| Legal & General Group Plc | 4,044 | $38.6K | 0.00% | +445+12.4% | Added |
| Royal Bank of Canada | 4,427 | $42.0K | 0.00% | −5,904−57.1% | Reduced |
| Rockefeller Capital Management L.P. | 4,590 | $43.8K | 0.00% | +185+4.2% | Added |
| Brown Brothers Harriman & Co | 5,000 | $47.8K | 0.00% | 00.0% | Unchanged |
| Pinnacle Wealth Planning Services, Inc. | 5,668 | $54.1K | 0.01% | +5,668 | New |
| Public Employees Retirement Association of Colorado | 6,552 | $63.0K | 0.00% | 00.0% | Unchanged |
| Canada Pension Plan Investment Board | 7,100 | $67.8K | 0.00% | +7,100 | New |
| China Universal Asset Management Co., Ltd. | 8,772 | $83.8K | 0.01% | −664−7.0% | Reduced |
| New York State Common Retirement Fund | 8,979 | $85.7K | 0.00% | 00.0% | Unchanged |
| Fox Run Management, L.L.C. | 10,045 | $95.9K | 0.01% | −34,287−77.3% | Reduced |
| CWM, LLC | 10,095 | $96.0K | 0.00% | −151−1.5% | Reduced |
| ProShare Advisors LLC | 10,425 | $99.6K | 0.00% | +10,425 | New |
| Inscription Capital, LLC | 10,652 | $101.7K | 0.01% | +172+1.6% | Added |
| PDT Partners, LLC | 11,334 | $108.2K | 0.01% | +11,334 | New |
| DRW Securities, LLC | 11,955 | $114.2K | 0.01% | +11,955 | New |
| Skopos Labs, Inc. | 12,047 | $114.2K | 0.01% | +934+8.4% | Added |
| Citigroup Inc | 12,318 | $117.6K | 0.00% | +8,726+242.9% | Added |
| Police & Firemen's Retirement System of New Jersey | 12,453 | $118.9K | 0.00% | −11−0.1% | Reduced |
| Cary Street Partners Financial LLC | 12,500 | $119.4K | 0.00% | 00.0% | Unchanged |
| Great Lakes Advisors, LLC | 13,189 | $126.0K | 0.00% | −95−0.7% | Reduced |
| Manufacturers Life Insurance Company, The | 13,695 | $130.8K | 0.00% | −172−1.2% | Reduced |
| State Board of Administration of Florida Retirement System | 15,386 | $146.9K | 0.00% | 00.0% | Unchanged |
| Jones Financial Companies LLLP | 15,900 | $151.8K | 0.00% | +1,900+13.6% | Added |
| Chicago Partners Investment Group LLC | 15,222 | $152.2K | 0.00% | +381+2.6% | Added |
| Susquehanna International Group, LLP | 15,975 | $152.6K | 0.00% | −141,472−89.9% | Reduced |
| Raymond James Financial Inc | 16,483 | $157.4K | 0.00% | −5,549−25.2% | Reduced |
| Entropy Technologies, LP | 16,900 | $161.4K | 0.01% | +16,900 | New |
| Atom Investors LP | 17,026 | $162.6K | 0.01% | −4,289−20.1% | Reduced |
| STRS Ohio | 17,600 | $168.1K | 0.00% | −11,200−38.9% | Reduced |
| Ballentine Partners, LLC | 18,070 | $172.6K | 0.00% | −240−1.3% | Reduced |
| Trexquant Investment LP | 19,384 | $185.1K | 0.00% | −259,595−93.1% | Reduced |
| Intech Investment Management LLC | 20,601 | $196.7K | 0.00% | +1,213+6.3% | Added |
| Mogy Joel R Investment Counsel Inc | 20,750 | $198.2K | 0.01% | 00.0% | Unchanged |
| Covestor Ltd | 21,793 | $208.0K | 0.11% | −9,639−30.7% | Reduced |
| Millennium Management LLC | 21,976 | $209.9K | 0.00% | −599,123−96.5% | Reduced |
| Headlands Technologies LLC | 23,352 | $223.0K | 0.02% | +23,352 | New |
| Polymer Capital Management (US) LLC | 23,513 | $224.5K | 0.03% | +23,513 | New |
| Edgewood Management LLC | 24,060 | $229.8K | 0.00% | 00.0% | Unchanged |
| Purkiss Capital Advisors LLC | 25,086 | $239.6K | 0.11% | −300−1.2% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 25,240 | $239.9K | 0.00% | +6,406+34.0% | Added |
| MetLife Investment Management | 25,501 | $243.5K | 0.00% | +6,139+31.7% | Added |
| Virtus Investment Advisers, Inc. | 25,679 | $245.2K | 0.07% | +3,236+14.4% | Added |
| Gsa Capital Partners LLP | 26,354 | $252.0K | 0.02% | +26,354 | New |
| Tudor Investment Corp Et Al | 26,473 | $252.8K | 0.00% | −600−2.2% | Reduced |
| Invesco Ltd. | 26,609 | $254.1K | 0.00% | −4,694−15.0% | Reduced |
| HSBC Holdings PLC | 27,733 | $260.7K | 0.00% | −9,699−25.9% | Reduced |
| Graham Capital Management, L.P. | 27,756 | $265.1K | 0.01% | −25,637−48.0% | Reduced |