Birchview Capital, LP’s Prothena Corp PLC Position
Does Birchview Capital, LP own Prothena Corp PLC (PRTA)? Yes — 449.0K shares worth $4M (+2.48% of its 13F portfolio) as of Q1 2026, up from 441.0K shares the prior filed quarter.
Position Value
$4M
Q1 2026
Shares
449.0K
% of Portfolio
+2.48%
Quarters Held
20
currently held
Position History PRTA
Reported value by quarter
| Quarter | Shares | Value | % of Portfolio |
|---|---|---|---|
| Q1 2026 | 449.0K | $4M | +2.48% |
| Q4 2025 | 441.0K | $4M | +2.47% |
| Q3 2025 | 549.0K | $5M | +4.05% |
| Q2 2025 | 451.0K | $3M | +2.72% |
| Q1 2025 | 333.0K | $4M | +3.58% |
| Q4 2024 | 304.6K | $4M | +3.44% |
| Q3 2024 | 209.6K | $4M | +3.04% |
| Q2 2024 | 203.6K | $4M | +3.89% |
| Q1 2024 | 169.6K | $4M | +3.43% |
| Q4 2023 | 169.6K | $6M | +4.83% |
| Q3 2023 | 169.6K | $8M | +6.96% |
| Q2 2023 | 156.1K | $11M | +7.99% |
| Q1 2023 | 128.4K | $6M | +4.87% |
| Q4 2022 | 127.2K | $8M | +5.41% |
| Q3 2022 | 118.9K | $7M | +5.08% |
| Q2 2022 | 102.5K | $3M | +2.03% |
| Q1 2022 | 42.0K | $2M | +1.11% |
| Q4 2021 | 40.2K | $2M | +1.28% |
| Q3 2021 | 40.2K | $3M | +1.95% |
| Q2 2021 | 30.2K | $2M | +0.93% |
Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Birchview Capital, LP’s full portfolio or all institutional holders of PRTA.