Prothena Corporation plc
PRTANASDAQHealthcareBiotechnology
As of Oct 23, 2026 close
- Market cap
- $427.59M
- P/E (TTM)
- -
- Forward P/E
- -
- Dividend yield
- -
- 52-week range
- $7.73$11.80
- Volume (live)
- -
- Avg. volume (3M)
- 552.87K
Prothena Corporation (PRTA) Stock Price & Financial Analysis
Prothena Corporation Stock Price Chart
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Financial Metrics & Key Statistics
Fundamental metrics, valuation ratios, and profitability indicators
| Day's Range | $7.93 - $8.27 |
|---|---|
| 52-Week High | $11.80 |
| 52-Week Low | $7.73 |
| Open | $8.18 |
| Volume (last close) | 386.14K |
| Average Volume (3M) | 552.87K |
| Revenue (TTM) | 54.53M |
|---|---|
| Net Income (TTM) | -43.99M |
| Free Cash Flow (TTM) | -60.71M |
| EPS (TTM) | −$0.82 |
| Profit Margin | -80.67% |
| Operating Margin | -115.09% |
| Return on Equity (ROE) | -15.33% |
| Debt to Equity | 0.02 |
| Annual Dividend | $0.00 |
|---|---|
| Dividend Yield | 0.00% |
| Market Cap | 427.59M |
|---|---|
| Shares Outstanding | 52.15M |
| Price to Sales (P/S) | 7.84 |
| Price to Book (P/B) | 1.49 |
| EV/EBITDA | -3.61 |
| 50-Day MA | $8.85 |
|---|---|
| 200-Day MA | $9.26 |
| 1-Year Change | −15.49% |
Source: Market prices and company fundamentals. Data as of Oct 23, 2026. Data sources and methodology
Prothena Corporation at a Glance
As of the Oct 23, 2026 close, Prothena Corporation (PRTA) has a market capitalization of $427.59M. The stock trades at 7.8× sales. Over the trailing twelve months it lost $43.99M on revenue of $54.53M and burned $60.71M of free cash flow. Revenue grew 427.3% year over year.
As of its latest reported balance sheet, it holds $288.19M in cash and securities against $6.99M of debt, a net cash position of $281.20M.
Prothena Corporation does not currently pay a dividend.
The share price is down 15.5% over the past year. At $8.20 (the Oct 23, 2026 close) it sits near the bottom of its 52-week range of $7.73 to $11.80, below its 200-day moving average of $9.26.
Based on 4 professional analyst ratings from the past 90 days, the consensus is Buy with an average price target of $26.33, 221.1% above the Oct 23, 2026 close.
Frequently Asked Questions About Prothena Corporation
What is the current stock price for PRTA?
As of the Oct 23, 2026 close, PRTA stock trades at $8.20. The 52-week range is $7.73–$11.80, with a day range of $7.93–$8.27.
What is the P/E ratio for PRTA?
The P/E ratio (Price-to-Earnings) for PRTA is shown in the Key Statistics section. This valuation metric helps compare Prothena Corporation plc to industry peers.
Does PRTA pay dividends?
Prothena Corporation does not currently pay a regular dividend. It reported a net loss over the trailing twelve months, so it has no earnings to distribute. Check the Dividends tab for historical dividend information.
What do analysts recommend for PRTA?
Based on ratings from 4 professional analysts over the last 90 days, the consensus for PRTA is Buy. The average 12-month price target is $26.33, a 221.1% upside from the Oct 23, 2026 close of $8.20.
What is the market cap of PRTA?
As of the Oct 23, 2026 close, Prothena Corporation's market capitalization is $427.6M, classifying it as a small-cap company. Prothena Corporation operates in the Healthcare sector within the Biotechnology industry.