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    • Prothena Corporation logo

    Prothena Corporation

    PRTA | NASDAQ
    Chart Builder DCF Calculator
    $8.51
    -$0.07 (-0.82%)
    At close: Sep 21, 2026, 4:00 PM ET
    $8.75
    +$0.24 (+2.82%)
    After-hours: Sep 21, 2026, 7:30 PM ET
    Overview Rating Statistics Financials Earnings Analysts Ownership Profile

    Market Data

    Market Cap
    $449.19M
    Enterprise Value
    $164.32M
    Beta
    -0.33
    Average Volume
    519.96K
    Shares Outstanding (Diluted)
    52.15M
    Shares Change YoY
    -3.12%
    Institutional Ownership
    87.47%
    Exchange
    NASDAQ
    ISIN
    IE00B91XRN20

    Price Performance

    Price Change 1M
    -10.0%
    Price Change 3M
    -10.9%
    Price Change 6M
    -8.6%
    Price Change YTD
    -7.5%
    Price Change 1Y
    2.6%
    Price Change 3Y
    -83.3%
    Price Change 5Y
    -88.7%
    1M CAGR (ann.)
    0.0%
    1Y CAGR (ann.)
    6.5%
    5Y CAGR (ann.)
    -35.4%
    All-Time CAGR
    1.3%

    Valuation

    PE Ratio
    -10.13
    Forward PE
    310.33
    PEG Ratio
    -0.06
    Forward PEG
    0.01
    PS Ratio
    8.17
    Forward PS
    15.20
    PB Ratio
    1.55
    P/FCF Ratio
    -14.00
    P/Adj. FCF Ratio
    -6.57
    P/OCF Ratio
    -7.40
    EV/Sales
    3.01
    EV/EBIT
    -3.77
    EV/EBITDA
    -3.99
    EV/FCF
    -5.16
    Earnings Yield
    -9.9%
    FCF Yield
    -7.2%
    Adj. FCF Yield
    -15.2%

    Financial Health

    Net Cash
    $281.2M
    Total Debt
    $6.99M
    Cash & Short-Term Investments
    $288.19M
    Total Assets
    $302.58M
    Current Ratio
    25.05
    Quick Ratio
    25.05
    Debt / Equity Ratio
    0.02
    Debt / EBITDA
    -0.17
    Debt / FCF
    -0.22
    OCF / Debt
    -4.46
    Interest Coverage
    0.00
    Altman Z-Score
    11.83
    Piotroski F-Score
    4

    Margins & Profitability

    Gross Profit Margin
    43.5%
    Operating Profit Margin
    -115.1%
    EBITDA Margin
    -75.4%
    Net Profit Margin
    -80.7%
    FCF Margin
    -58.4%
    Adj. FCF Margin
    -124.4%
    SBC / Revenue
    53.3%
    SBC Impact (per share)
    -113.0%

    Returns

    Return on Assets
    -14.5%
    Return on Equity
    -15.0%
    Return on Invested Capital
    -21.4%
    Return on Capital Employed
    -21.6%
    Return on Tangible Assets
    -14.5%

    Historical Growth (CAGR)

    Revenue CAGR 3Y
    -1.8%
    Revenue CAGR 5Y
    -2.1%
    Revenue CAGR 10Y
    44.9%
    EPS CAGR 3Y
    3.2%
    EPS CAGR 5Y
    -19.4%
    EPS CAGR 10Y
    7.7%
    FCF CAGR 3Y
    31.8%
    FCF CAGR 5Y
    -18.2%
    FCF CAGR 10Y
    -1.6%

    Analyst Forecasts

    Analyst Rating
    Buy
    Analyst Count
    28
    EPS Growth Next 3Y
    26.5%
    Revenue Growth Next 3Y
    54.4%
    Earnings Date
    Nov 4, 2026
    EPS Estimate (next Q)
    -$0.38
    EPS Growth Est (next Q)
    -43.3%
    Revenue Est (next Q)
    $9.58M
    Revenue Growth Est (next Q)
    296.5%

    Fair Value Estimates

    Graham Number
    N/A
    Graham Upside
    N/A
    Lynch Fair Value
    N/A
    Lynch Upside
    N/A
    Price Target
    $30
    Price Target Upside
    252.5%

    Cash Flow

    Operating Cash Flow
    $-31.17M
    Free Cash Flow
    $-31.83M
    Adj. Free Cash Flow
    $-67.82M
    FCF Per Share
    -$1.16
    OCF Per Share
    -$1.15
    OCF/S Ratio
    -110.1%

    Income Statement

    Revenue
    $54.53M
    Gross Profit
    $23.73M
    Operating Income
    $-62.76M
    EBITDA
    $-41.14M
    Net Income
    $-43.99M
    EPS (Diluted)
    -$0.84
    Revenue / Employee
    $813.88K
    Profit / Employee
    $-656.6K
    Employees
    67

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