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 2026
Institutional positions in Prothena Corp Public Ltd Co as of Jun 30, 2026. 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
- +5 vs. Q1 2026
- Shares held
- 47.3M
- +304.2K (+0.6%) vs. Q1 2026
- Total value
- $462.7M
- +$6.28M (+1.4%) vs. Q1 2026
- New holders
- 28
- 55 more added
- Sold out
- 23
- 58 more reduced
4 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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 2026
Shares, value and share of portfolio for each institution holding Prothena Corp Public Ltd Co; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Group One Trading, L.P. | 0 | $0 | 0.00% | −3,416−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −1,303−100.0% | Sold out |
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −841−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −256−100.0% | Sold out |
| Johnson Financial Group, Inc. | 0 | $0 | 0.00% | −151−100.0% | Sold out |
| Keating Financial Advisory Services, Inc. | 0 | $0 | 0.00% | −76−100.0% | Sold out |
| Root Financial Partners, LLC | 0 | $0 | 0.00% | −38−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −30−100.0% | Sold out |
| MAI Capital Management | 0 | $0 | 0.00% | −10−100.0% | Sold out |
| Wealth Preservation Advisors, LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Deeter Investments LLP | – | – | – | – | Not filed |
| Skopos Labs, Inc. | – | – | – | – | Not filed |
| CWM, LLC | – | – | – | – | Not filed |
| Evelyn Partners Investment Management LLP | – | – | – | – | Not filed |