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, Q2 2025
Institutional positions in Prothena Corp Public Ltd Co as of Jun 30, 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
- 189
- +29 vs. Q1 2025
- Shares held
- 41.8M
- −10.5M (−20.2%) vs. Q1 2025
- Total value
- $253.6M
- −$393.7M (−60.8%) vs. Q1 2025
- New holders
- 51
- 54 more added
- Sold out
- 22
- 41 more reduced
1 institution that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 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, Q2 2025
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| EverSource Wealth Advisors, LLC | 0 | $0 | 0.00% | −304−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −227−100.0% | Sold out |
| Boston Private Wealth LLC | 0 | $0 | 0.00% | −274−100.0% | Sold out |
| Caitong International Asset Management Co., Ltd | 0 | $0 | 0.00% | −238−100.0% | Sold out |
| Massmutual Trust Co FSB | 0 | $0 | 0.00% | −112−100.0% | Sold out |
| Coldstream Capital Management Inc | 0 | $0 | 0.00% | −51−100.0% | Sold out |
| Rothschild Investment LLC | 0 | $0 | 0.00% | −45−100.0% | Sold out |
| Larson Financial Group LLC | 0 | $0 | 0.00% | −42−100.0% | Sold out |
| Parkside Financial Bank & Trust | 0 | $0 | 0.00% | −30−100.0% | Sold out |
| Smartleaf Asset Management LLC | 0 | $0 | 0.00% | −9−100.0% | Sold out |
| Hallmark Capital Management Inc | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Lindbrook Capital, LLC | – | – | – | – | Not filed |