Prothena Plc (PRTA)
$8.47 -4.62% Close Oct 30, 2026 Live
Prothena Plc stock today
Prothena Plc closed at $8.47 on October 30, 2026, down 4.62% on the day. Over the past year it returned -19.2% with dividends reinvested, against +12.4% for the S&P 500. Its market value is $443 million.
$8.00$10.00
NovJan 2026MarMayJulSep
| Period | PRTA | S&P 500 (SPY) |
|---|---|---|
| 1 month | +1.1% | -0.9% |
| 3 months | +0.7% | +2.1% |
| Year to date | -11.3% | +11.7% |
| 1 year | -19.2% | +12.4% |
| 3 years | -76.1% | +88.5% |
| 5 years | -84.7% | +76.0% |
Key statistics
- Market value
- $443M
- Price / sales
- 8.1
- 52-week range
- $7.91 to $11.51
- Next report
- Nov 5, 2026
About Prothena Plc
Develops and manufactures monoclonal antibodies and protein therapeutics.
Sector: Health Care
More on Prothena Plc
- Financials: revenue, earnings and segmentsRevenue -93% in the year to Dec 2025
- Returns: what $1,000 became$1,000 ten years ago is $164.31 today
No forecast, no recommendation. This page describes Prothena Plc from published data; it is not advice to buy, sell or hold any security.
Figures as of the close on Oct 30, 2026 unless a row says otherwise. Prices are split adjusted; returns include dividends reinvested. Data may be delayed. See the disclaimer and how TrendArc works.