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, 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 |
|---|---|---|---|---|---|
| STRS Ohio | 17,600 | $168.1K | 0.00% | −11,200−38.9% | Reduced |
| Atom Investors LP | 17,026 | $162.6K | 0.01% | −4,289−20.1% | Reduced |
| Entropy Technologies, LP | 16,900 | $161.4K | 0.01% | +16,900 | New |
| Raymond James Financial Inc | 16,483 | $157.4K | 0.00% | −5,549−25.2% | Reduced |
| Susquehanna International Group, LLP | 15,975 | $152.6K | 0.00% | −141,472−89.9% | Reduced |
| Chicago Partners Investment Group LLC | 15,222 | $152.2K | 0.00% | +381+2.6% | Added |
| Jones Financial Companies LLLP | 15,900 | $151.8K | 0.00% | +1,900+13.6% | Added |
| State Board of Administration of Florida Retirement System | 15,386 | $146.9K | 0.00% | 00.0% | Unchanged |
| Manufacturers Life Insurance Company, The | 13,695 | $130.8K | 0.00% | −172−1.2% | Reduced |
| Great Lakes Advisors, LLC | 13,189 | $126.0K | 0.00% | −95−0.7% | Reduced |
| Cary Street Partners Financial LLC | 12,500 | $119.4K | 0.00% | 00.0% | Unchanged |
| Police & Firemen's Retirement System of New Jersey | 12,453 | $118.9K | 0.00% | −11−0.1% | Reduced |
| Citigroup Inc | 12,318 | $117.6K | 0.00% | +8,726+242.9% | Added |
| Skopos Labs, Inc. | 12,047 | $114.2K | 0.01% | +934+8.4% | Added |
| DRW Securities, LLC | 11,955 | $114.2K | 0.01% | +11,955 | New |
| PDT Partners, LLC | 11,334 | $108.2K | 0.01% | +11,334 | New |
| Inscription Capital, LLC | 10,652 | $101.7K | 0.01% | +172+1.6% | Added |
| ProShare Advisors LLC | 10,425 | $99.6K | 0.00% | +10,425 | New |
| CWM, LLC | 10,095 | $96.0K | 0.00% | −151−1.5% | Reduced |
| Fox Run Management, L.L.C. | 10,045 | $95.9K | 0.01% | −34,287−77.3% | Reduced |
| New York State Common Retirement Fund | 8,979 | $85.7K | 0.00% | 00.0% | Unchanged |
| China Universal Asset Management Co., Ltd. | 8,772 | $83.8K | 0.01% | −664−7.0% | Reduced |
| Canada Pension Plan Investment Board | 7,100 | $67.8K | 0.00% | +7,100 | New |
| Public Employees Retirement Association of Colorado | 6,552 | $63.0K | 0.00% | 00.0% | Unchanged |
| Pinnacle Wealth Planning Services, Inc. | 5,668 | $54.1K | 0.01% | +5,668 | New |
| Brown Brothers Harriman & Co | 5,000 | $47.8K | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 4,590 | $43.8K | 0.00% | +185+4.2% | Added |
| Royal Bank of Canada | 4,427 | $42.0K | 0.00% | −5,904−57.1% | Reduced |
| Legal & General Group Plc | 4,044 | $38.6K | 0.00% | +445+12.4% | Added |
| Signaturefd, LLC | 3,609 | $34.5K | 0.00% | −61−1.7% | Reduced |
| Ameritas Investment Partners, Inc. | 3,428 | $32.7K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 2,826 | $27.0K | 0.00% | +1,541+119.9% | Added |
| California State Teachers Retirement System | 2,710 | $25.9K | 0.00% | +295+12.2% | Added |
| Mirae Asset Global Investments Co., Ltd. | 2,616 | $25.0K | 0.00% | +535+25.7% | Added |
| Farther Finance Advisors, LLC | 2,434 | $23.2K | 0.00% | 00.0% | Unchanged |
| Sterling Capital Management LLC | 2,327 | $22.2K | 0.00% | −220−8.6% | Reduced |
| Versant Capital Management, Inc | 2,044 | $19.5K | 0.00% | 00.0% | Unchanged |
| Simplex Trading, LLC | 1,927 | $18.4K | 0.00% | −40,117−95.4% | Reduced |
| Flagship Wealth Advisors, LLC | 1,500 | $14.3K | 0.00% | 00.0% | Unchanged |
| Amalgamated Bank | 1,383 | $13.0K | 0.00% | −57−4.0% | Reduced |
| Quadrant Capital Group LLC | 1,260 | $12.0K | 0.00% | 00.0% | Unchanged |
| GF Fund Management Co. Ltd. | 1,057 | $10.1K | 0.00% | −98−8.5% | Reduced |
| Federation des caisses Desjardins du Quebec | 1,000 | $9.55K | 0.00% | +1,000 | New |
| HighMark Wealth Management LLC | 900 | $8.60K | 0.00% | −1,108−55.2% | Reduced |
| Allworth Financial LP | 885 | $8.45K | 0.00% | +20+2.3% | Added |
| Torren Management, LLC | 884 | $8.44K | 0.00% | +884 | New |
| HM Payson & Co | 600 | $5.73K | 0.00% | 00.0% | Unchanged |
| GAMMA Investing LLC | 510 | $4.87K | 0.00% | +124+32.1% | Added |
| US Bancorp | 359 | $3.43K | 0.00% | +45+14.3% | Added |
| Essential Partners LLC | 333 | $3.18K | 0.00% | 00.0% | Unchanged |
| Optiver Holding B.V. | 296 | $2.83K | 0.00% | −56−15.9% | Reduced |
| Advisor Group Holdings, Inc. | 237 | $2.26K | 0.00% | −6−2.5% | Reduced |
| Daiwa Securities Group Inc. | 195 | $2.00K | 0.00% | 00.0% | Unchanged |
| Evelyn Partners Investment Management LLP | 199 | $1.90K | 0.00% | 00.0% | Unchanged |
| Basecamp Wealth Advisors LLC | 197 | $1.88K | 0.00% | +197 | New |
| Asset Dedication, LLC | 184 | $1.76K | 0.00% | 00.0% | Unchanged |
| Parallel Advisors, LLC | 179 | $1.71K | 0.00% | 00.0% | Unchanged |
| Sittner & Nelson, LLC | 185 | $1.65K | 0.00% | +30+19.4% | Added |
| Johnson Financial Group, Inc. | 151 | $1.44K | 0.00% | 00.0% | Unchanged |
| Albion Financial Group | 125 | $1.19K | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 112 | $1.07K | 0.00% | −480−81.1% | Reduced |
| True Wealth Design, LLC | 103 | $984 | 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 |
| EverSource Wealth Advisors, LLC | 90 | $860 | 0.00% | 00.0% | Unchanged |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 71 | $678 | 0.00% | 00.0% | Unchanged |
| Northwestern Mutual Wealth Management Co | 54 | $516 | 0.00% | +4+8.0% | Added |
| CIBC Private Wealth Group, LLC | 48 | $458 | 0.00% | 00.0% | Unchanged |
| Ronald Blue Trust, Inc. | 33 | $315 | 0.00% | 00.0% | Unchanged |
| Larson Financial Group LLC | 26 | $248 | 0.00% | +20+333.3% | Added |
| CoreCap Advisors, LLC | 23 | $220 | 0.00% | 00.0% | Unchanged |
| Caitong International Asset Management Co., Ltd | 23 | $220 | 0.00% | +23 | New |
| SBI Securities Co., Ltd. | 15 | $143 | 0.00% | −14−48.3% | Reduced |
| IFP Advisors, Inc | 15 | $143 | 0.00% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 13 | $124 | 0.00% | −5,371−99.8% | Reduced |
| Key Financial Inc | 12 | $115 | 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 |
| Steward Partners Investment Advisory, LLC | 6 | $57 | 0.00% | 00.0% | Unchanged |
| Harbour Investments, Inc. | 1 | $10 | 0.00% | 00.0% | Unchanged |
| New Millennium Group LLC | 1 | $10 | 0.00% | +1 | New |
| Resources Management Corp | 3 | $0 | 0.00% | +3 | New |
| Algert Global LLC | 0 | $0 | 0.00% | −445,811−100.0% | Sold out |
| Janney Montgomery Scott LLC | 0 | $0 | 0.00% | −106,898−100.0% | Sold out |
| Monaco Asset Management SAM | 0 | $0 | 0.00% | −70,000−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −56,080−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −55,764−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −31,106−100.0% | Sold out |
| Proficio Capital Partners LLC | 0 | $0 | 0.00% | −30,136−100.0% | Sold out |
| Boothbay Fund Management, LLC | 0 | $0 | 0.00% | −30,000−100.0% | Sold out |
| Arizona PSPRS Trust | 0 | $0 | 0.00% | −27,700−100.0% | Sold out |
| Sandia Investment Management LP | 0 | $0 | 0.00% | −29,950−100.0% | Sold out |
| Cambridge Investment Research Advisors, Inc. | 0 | $0 | 0.00% | −27,513−100.0% | Sold out |
| Alps Advisors Inc | 0 | $0 | 0.00% | −25,727−100.0% | Sold out |
| Rock Springs Capital Management LP | 0 | $0 | 0.00% | −25,398−100.0% | Sold out |
| Handelsbanken Fonder AB | 0 | $0 | 0.00% | −20,900−100.0% | Sold out |
| Prosight Management, LP | 0 | $0 | 0.00% | −20,000−100.0% | Sold out |
| Foundation Wealth Management, LLC | 0 | $0 | 0.00% | −19,471−100.0% | Sold out |
| Thrivent Financial for Lutherans | 0 | $0 | 0.00% | −12,980−100.0% | Sold out |
| Jain Global LLC | 0 | $0 | 0.00% | −11,780−100.0% | Sold out |