Nasdaq
PRTA
Prothena Corporation plc
- Health Care
- 1 day
- +1.1%
- 1 month
- −11.4%
- 1 year
- +8.3%
$8.58 · Mkt cap $449M
At the 6 Aug 2026 close
Nasdaq
Prothena Corporation plc
$8.58 · Mkt cap $449M
At the 6 Aug 2026 close
Prothena Corporation plc trades under the ticker PRTA on Nasdaq, in the Health Care sector (Biotechnology: Pharmaceutical Preparations). Its market capitalisation is $449M. The last closing price was $8.58, on 6 Aug 2026. No price-to-earnings ratio is shown, because it did not report positive earnings in its last annual filing. Over the past year the share price is +8.3%, and −11.4% over the past month. Returns are price returns and exclude dividends.
This page exists because PRTA is one of the shares What A Share can show you. It is not a recommendation, and its appearance here says nothing about whether the company is worth owning.