earnings
PR
NASDAQ · PRTA
Prothena Corporation plc Ordinary Shares
Healthcare · Biotechnology
$8.58
Up+$0.12 (+1.42%)
Updated Sep 21, 2026, 4:19 AM
SID Score
3.8/10
Composite research score
Smart Money
—
Institutional and insider signal
- Market cap
- 556.49M
- P/E ratio
- -1.98
- Dividend yield
- 0.00%
- 52-week range
- $7.73 – $11.80
- Volume
- 1.83M
- Avg. volume
- 643.8K
Price performance
PRTA price history
1M range · 19 trading sessions · Daily adjusted prices
PRTA closed at $8.58 after 19 trading sessions, down 8.63% for the selected period.
- Last close
- $8.58
- Period change
- -8.63%
- Period low
- $8.24
- Period high
- $9.82
Daily close
View OHLC price history
| Date | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|
| Sep 18, 2026 | $8.41 | $8.60 | $8.25 | $8.58 | 1.83M |
| Sep 17, 2026 | $8.39 | $8.56 | $8.23 | $8.46 | 404.76K |
| Sep 16, 2026 | $8.35 | $8.50 | $8.20 | $8.24 | 398.34K |
| Sep 15, 2026 | $8.86 | $8.86 | $8.295 | $8.33 | 323.44K |
| Sep 14, 2026 | $8.95 | $8.99 | $8.79 | $8.86 | 374.87K |
| Sep 11, 2026 | $9.06 | $9.14 | $8.765 | $8.93 | 376.28K |
| Sep 10, 2026 | $9.25 | $9.255 | $8.97 | $9.02 | 310.91K |
| Sep 9, 2026 | $9.40 | $9.4958 | $9.22 | $9.30 | 294.56K |
| Sep 8, 2026 | $9.60 | $9.67 | $9.345 | $9.54 | 305.44K |
| Sep 4, 2026 | $9.50 | $9.87 | $9.48 | $9.82 | 383.93K |
| Sep 3, 2026 | $9.77 | $9.78 | $9.5119 | $9.60 | 277.06K |
| Sep 2, 2026 | $9.64 | $9.75 | $9.37 | $9.685 | 341.06K |
| Sep 1, 2026 | $9.28 | $9.63 | $9.26 | $9.61 | 267.67K |
| Aug 31, 2026 | $9.26 | $9.40 | $9.1001 | $9.35 | 335.15K |
| Aug 28, 2026 | $9.02 | $9.479 | $8.95 | $9.33 | 498.12K |
| Aug 27, 2026 | $9.16 | $9.24 | $8.95 | $9.09 | 338.92K |
| Aug 26, 2026 | $9.40 | $9.40 | $9.1533 | $9.25 | 289.04K |
| Aug 25, 2026 | $9.51 | $9.82 | $9.42 | $9.42 | 363.71K |
| Aug 24, 2026 | $9.46 | $9.49 | $9.19 | $9.39 | 248.12K |
Latest PRTA news
The latest Smart Investors Daily articles mentioning PRTA.
Stock researchCompany · Financials
Loading stock research…