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 2022
Institutional positions in Prothena Corp Public Ltd Co as of Dec 31, 2022. 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
- 201
- +21 vs. Q3 2022
- Shares held
- 49.4M
- +4.96M (+11.2%) vs. Q3 2022
- Total value
- $2.98B
- +$282.3M (+10.5%) vs. Q3 2022
- New holders
- 44
- 77 more added
- Sold out
- 23
- 51 more reduced
3 institutions that held it in Q3 2022 haven't filed for Q4 2022 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2022: 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 2022
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q3 2022.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 11,584,280 | $698.0M | 21.27% | 00.0% | Unchanged |
| Redmile Group, LLC | 0 | $0 | 0.00% | −525,575−100.0% | Sold out |
| Sessa Capital IM, L.P. | 0 | $0 | 0.00% | −187,000−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −107,803−100.0% | Sold out |
| Guggenheim Capital LLC | 0 | $0 | 0.00% | −75,795−100.0% | Sold out |
| Walleye Trading LLC | 0 | $0 | 0.00% | −48,295−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −23,666−100.0% | Sold out |
| New York Life Investments Alternatives | 0 | $0 | 0.00% | −22,566−100.0% | Sold out |
| Hussman Strategic Advisors, Inc. | 0 | $0 | 0.00% | −15,600−100.0% | Sold out |
| NinePointTwo Capital | 0 | $0 | 0.00% | −15,290−100.0% | Sold out |
| Wolverine Trading, LLC | 0 | $0 | 0.00% | −14,805−100.0% | Sold out |
| Virginia Retirement Systems Et Al | 0 | $0 | 0.00% | −14,000−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −12,363−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −7,126−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −6,523−100.0% | Sold out |
| Quantamental Technologies LLC | 0 | $0 | 0.00% | −5,106−100.0% | Sold out |
| Hunter Perkins Capital Management, LLC | 0 | $0 | 0.00% | −4,101−100.0% | Sold out |
| Winton Group Ltd | 0 | $0 | 0.00% | −4,039−100.0% | Sold out |
| Old Well Partners, LLC | 0 | $0 | 0.00% | −3,924−100.0% | Sold out |
| Vident Investment Advisory, LLC | 0 | $0 | 0.00% | −3,916−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −3,813−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −1,733−100.0% | Sold out |
| Bessemer Group Inc | 0 | $0 | 0.00% | −63−100.0% | Sold out |
| Crewe Advisors LLC | 0 | $0 | 0.00% | −52−100.0% | Sold out |
| Jefferies Group LLC | – | – | – | – | Not filed |
| American Portfolios Advisors | – | – | – | – | Not filed |
| Covington Capital Management | – | – | – | – | Not filed |