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 2023
Institutional positions in Prothena Corp Public Ltd Co as of Dec 31, 2023. 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
- 187
- +2 vs. Q3 2023
- Shares held
- 53.6M
- +627.6K (+1.2%) vs. Q3 2023
- Total value
- $1.95B
- −$606.9M (−23.8%) vs. Q3 2023
- New holders
- 40
- 68 more added
- Sold out
- 38
- 46 more reduced
2 institutions that held it in Q3 2023 haven't filed for Q4 2023 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2023: 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 2023
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q3 2023.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Healthcare of Ontario Pension Plan Trust Fund | 0 | $0 | 0.00% | −30,500−100.0% | Sold out |
| Silverarc Capital Management, LLC | 0 | $0 | 0.00% | −26,629−100.0% | Sold out |
| Moody Aldrich Partners LLC | 0 | $0 | 0.00% | −23,904−100.0% | Sold out |
| Martingale Asset Management L P | 0 | $0 | 0.00% | −12,415−100.0% | Sold out |
| Bayesian Capital Management, LP | 0 | $0 | 0.00% | −9,299−100.0% | Sold out |
| Walleye Trading LLC | 0 | $0 | 0.00% | −9,267−100.0% | Sold out |
| HighVista Strategies LLC | 0 | $0 | 0.00% | −9,195−100.0% | Sold out |
| Corton Capital Inc. | 0 | $0 | 0.00% | −9,091−100.0% | Sold out |
| Victory Capital Management Inc | 0 | $0 | 0.00% | −8,781−100.0% | Sold out |
| Capstone Investment Advisors, LLC | 0 | $0 | 0.00% | −8,135−100.0% | Sold out |
| Point72 Middle East FZE | 0 | $0 | 0.00% | −7,716−100.0% | Sold out |
| Allianz Asset Management GmbH | 0 | $0 | 0.00% | −6,800−100.0% | Sold out |
| Magnetar Financial LLC | 0 | $0 | 0.00% | −5,923−100.0% | Sold out |
| Occudo Quantitative Strategies LP | 0 | $0 | 0.00% | −5,223−100.0% | Sold out |
| Pictet Asset Management Holding SA | 0 | $0 | 0.00% | −5,057−100.0% | Sold out |
| SEI Investments Co | 0 | $0 | 0.00% | −4,717−100.0% | Sold out |
| Captrust Financial Advisors | 0 | $0 | 0.00% | −4,338−100.0% | Sold out |
| Walleye Capital LLC | 0 | $0 | 0.00% | −4,286−100.0% | Sold out |
| Beirne Wealth Consulting Services, LLC | 0 | $0 | 0.00% | −3,000−100.0% | Sold out |
| Jefferies Financial Group Inc. | 0 | $0 | 0.00% | −3,085−100.0% | Sold out |
| Headlands Technologies LLC | 0 | $0 | 0.00% | −1,531−100.0% | Sold out |
| Federated Hermes, Inc. | 0 | $0 | 0.00% | −9−100.0% | Sold out |
| Tfo-TDC, LLC | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Register Financial Advisors LLC | 0 | $0 | 0.00% | −4−100.0% | Sold out |
| Gradient Investments LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| International Biotechnology Trust PLC | – | – | – | – | Not filed |
| Steward Financial Group LLC | – | – | – | – | Not filed |