Why Prothena Corporation plc’s (PRTA) Stock Is Down 5.50%
As of Friday, July 10, Prothena Corporation plc’s PRTA share price has dipped by 5.50%, which has investors questioning if this is right time to buy.Jenna Brashear
A+ Stock Grade Summary:
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Jenna Brashear
Jenna Brashear
Cynthia McLaughlin
Michael Rose
Cynthia McLaughlin
| Share Statistics | PRTA | Industry Median |
Percentile (All Stocks) |
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| Market Cap (Mil) | $425.1 | $252.6 | 36% |
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| Shares Out (Mil) | 54.1 | 52.3 | 50% |
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| Institutional Ownership | 79.5% | 92.1% | 49% |
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| Float (Mil) | 36.8 | 40.2 | 41% |
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| Beta | -0.32 | 0.95 | 2% |
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| Avg Daily Volume (000s) | 604 | 455 | 62% |
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| Price Change (52-week) |
18.0% | 52.9% | 60% |
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| Growth | PRTA | Industry Median |
Percentile (All Stocks) |
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| Sales (5yr) | 60.9% | 13.6% | 97% |
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| Net Income (5yr) | (17.0%) | (9.9%) | 23% |
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| EPS (5yr) | (10.2%) | 16.0% | 21 |
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| Dividends (5yr) | 0.0% | 0.0% | 0% |
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| Cash Flow (5yr) | (8.6%) | (15.6%) | 59% |
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| Estimates | Qtrly | Current Fiscal Year |
Next Fiscal Year |
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| # of Estimates | 2 | 2 | 1 | |
| Current EPS | ($0.380) | $0.050 | ($1.310) | |
| Month Ago EPS | ($0.380) | $0.050 | ($1.310) | |
| # Rev Up | 0 | 1 | 1 | |
| # Rev Down | 1 | 0 | 0 | |
| Three Months Ago EPS | $1.325 | $0.640 | ($1.040) | |
| Year/Year Chg | (163.3%) | (101.1%) | (95.6%) | |
| Financials | PRTA | Industry Median |
Percentile (All Stocks) |
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| Sales (TTM) (Mil) | $58 | $38 | 21% |
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| Net Income (TTM) (Mil) | ($151) | ($43) | 8% |
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| EPS (TTM) | ($2.810) | ($1.600) | 12% |
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| Operating Cash Flow (TTM) (Mil) | ($81) | ($31) | 7% |
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| Net Cash Flow (TTM) (Mil) | na | $5 | na |
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| Long-Term Debt (Q1) (Mil) | $5 | $5 | 24% |
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| Enterprise Value (Q1) (Mil) | $138 | $180 | 23% |
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| Valuation | PRTA | Industry Median |
Percentile (All Stocks) |
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| P/B | 1.38 | 2.56 | 36% |
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| P/E | na | 19.0 | na |
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| Dividend Yield | 0.0% | 0.0% | 0% |
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| PEG (5yr hist) | na | 0.9 | na |
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| Ratios | PRTA | Industry Median |
Percentile (All Stocks) |
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| Gross Margin | (66.8%) | 63.8% | 2% |
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| Net Margin | (260.9%) | (67.3%) | 4% |
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| ROA | (35.8%) | (49.8%) | 15% |
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| ROE | (40.3%) | (55.5%) | 17% |
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| Liabilities to Assets | 10.7% | 30.3% | 6% |
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| F-Score | 4 | 3 | 34% |
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Passing Stock Screens
As of 7/31/2026, from a list of 60 stock screening strategies,
| Performance Since Inception: | 13.0% |
| +/- S&P 500: | +5.5 |
Price and market data provided by QuoteMedia and delayed a minimum of 15 minutes unless otherwise indicated. Fundamental data provided by AAII's Stock Investor Pro and S&P Global Market Intelligence and are updated through the previous trading day.
Ⓒ 2026 American Association of Individual Investors