P

    Prothena Corporation plc (PRTA)

    Official site

    HEALTHCARE • BIOTECHNOLOGY • NASDAQ

    $9.35
    +0.02 (+0.21%)

    Market Cap: $478.97M

    Last updated: Sep 01, 2026 at 10:00 AM ET

    Earnings

    Performance (10Y)

    Beat Rate
    48%(19/40)
    Avg Surprise
    +15.99%
    Streak
    3 Q

    Upcoming Estimates

    Sep 30, 2026
    EPS Consensus$-0.38
    Range$-0.38 - $-0.38
    1 analysts
    EPS Revisions
    1
    0
    7d
    1
    0
    30d
    EPS Estimate Drift
    90d ago$-0.38+1.3%
    60d ago$-0.38+1.3%
    30d ago$-0.38+1.3%
    7d ago$-0.38+1.3%
    Current$-0.38
    Revenue Consensus
    $10M
    Range$0 - $55M
    6 analysts
    Dec 31, 2026
    EPS Consensus$1.72
    Range$1.72 - $1.72
    1 analysts
    Revenue Consensus
    $73M
    Range$42M - $97M
    6 analysts
    PeriodReportedEst.SurpriseB/MYoY
    Dec 26EST
    		-$1.72---
    Sep 26EST
    		-$-0.38---
    Jun 26
    		$-0.32$-0.39+17.95%Beat+81.5%
    Mar 26
    		$0.68$-0.30+326.67%Beat+160.7%
    Dec 25
    		$-0.46$-0.46+0.00%Beat+57.4%
    Sep 25
    		$-0.67$-0.54-24.07%Miss+39.1%
    Jun 25
    		$-1.73$-1.79+3.35%Beat-241.8%
    Mar 25
    		$-1.12$-1.03-8.74%Miss+16.4%
    Dec 24
    		$-1.08$-1.04-3.85%Miss+14.3%
    Sep 24
    		$-1.10$-1.18+6.78%Beat-389.5%
    Jun 24
    		$1.22$-1.03+218.45%Beat+218.4%
    Mar 24
    		$-1.34$-1.22-9.84%Miss-50.6%
    Dec 23
    		$-1.26$-1.19-5.88%Miss-1150.0%
    Sep 23
    		$0.38$-0.34+211.76%Beat+139.2%
    Jun 23
    		$-1.03$-0.97-6.19%Miss-17.0%
    Mar 23
    		$-0.89$-0.84-5.95%Miss-14.1%
    Dec 22
    		$0.12N/A+125.53%Beat+116.9%
    Sep 22
    		$-0.97$-0.62-56.45%Miss-145.5%
    Jun 22
    		$-0.88$-0.53-66.04%Miss-251.7%
    Mar 22
    		$-0.78$-0.64-21.88%Miss+14.3%
    Dec 21
    		$-0.71$-0.44-61.36%Miss+7.8%
    Sep 21
    		$2.13$2.24-4.91%Miss+376.6%
    Jun 21
    		$0.58N/A-50.43%Miss+187.9%
    Mar 21
    		$-0.91$-0.49-85.71%Miss-54.2%
    Dec 20
    		$-0.77$-0.74-4.05%Miss-42.6%
    Sep 20
    		$-0.77$-0.65-18.46%Miss-57.1%
    Jun 20
    		$-0.66$-0.59-11.86%Miss-65.0%
    Mar 20
    		$-0.59$-0.56-5.36%Miss-13.5%
    Dec 19
    		$-0.54$-0.55+1.82%Beat+10.0%
    Sep 19
    		$-0.49$-0.46-6.52%Miss+30.0%
    Jun 19
    		$-0.40$-0.58+31.03%Beat+60.0%
    Mar 19
    		$-0.52$-0.59+11.86%Beat+58.7%
    Dec 18
    		$-0.60$-0.89+32.58%Beat+51.6%
    Sep 18
    		$-0.70$-0.82+14.63%Beat+48.9%
    Jun 18
    		$-1.00$-1.24+19.35%Beat-117.4%
    Mar 18
    		$-1.26$-1.34+5.97%Beat-27.3%
    Dec 17
    		$-1.24$-1.48+16.22%Beat+12.1%
    Sep 17
    		$-1.37$-1.46+6.16%Beat-8.7%
    Jun 17
    		$-0.46$-0.81+43.21%Beat-
    Mar 17
    		$-0.99$-1.36+27.21%Beat-
    Dec 16
    		$-1.41$-1.21-16.53%Miss-
    Sep 16
    		$-1.26$-1.18-6.78%Miss-

    Key Metrics

    Valuation
    P/E Ratio-12.14EV/EBITDA-3.58x
    Price/FCFN/AFCF YieldN/A
    Profitability
    Profit Margin-80.70%Operating Margin-1850.00%
    ROE-14.40%ROICN/A
    Financial Health
    Debt/EquityN/AInterest Coverage5.04x
    Current Ratio25.05xQuick Ratio25.05x
    Trading Statistics
    Beta-0.35Avg Volume390.50K
    52-Week High$11.8052-Week Low$7.73

    Technical Indicators Dashboard

    Moving Averages

    SMA 10$9.23
    SMA 20$9.05
    SMA 50$9.04
    SMA 200$9.50
    EMA 10$9.22
    EMA 20$9.10
    EMA 50$9.07
    EMA 200$9.41

    MACD

    Line: 0.13Signal: 0.09Hist: 0.04

    ADX

    ADX: 11.0+DI: 23.7-DI: 20.8

    Aroon & PSAR

    Aroon Up84.0
    Aroon Down16.0
    PSAR$9.79

    Bollinger Bands

    Upper Band$9.68
    Lower Band$8.42
    %B Position1387%(Upper)
    Band Width0.74

    RSI (14-Day)

    Neutral
    56.3

    Momentum Oscillators

    Stoch %K55.3
    Stoch %D58.5
    Williams %R-37.9
    ROC (10d)5.3%
    Momentum0.47
    CCI (20d)67.1
    MFI (14d)53.3

    Volatility Measures

    ATR (14d)$0.41(4.4%)
    StdDev (20d)0.31
    Hist Vol40.1%(High)

    Volume Flow

    VWAP$9.28
    OBV-8.0M
    AD Line-26.8M
    CMF (20d)0.199

    Volume Metrics

    Avg Vol (20d)381.7K
    Vol Ratio0.9x
    VWMA (20d)$9.05

    Pivot Points

    R3$10.09
    R2$9.78
    R1$9.56
    Pivot Point$9.25
    S1$9.03
    S2$8.72
    S3$8.50

    Advanced Oscillators

    TSI9.87
    Ultimate Osc56.9
    KST44.50

    Financial Data

    QuarterJun 2026Mar 2026Dec 2025Sep 2025Jun 2025Mar 2025Dec 2024Sep 2024Jun 2024Mar 2024Dec 2023Sep 2023
    Total Revenue$1.01M$51.08M$21,000$2.42M$4.42M$2.83M$2.12M$970,000$132.01M$50,000$316,000$84.87M
    Cost of Revenue$0$0$942,000$0$0$0$913,000$0$0$0$61.89M$0
    Gross Profit$1.01M$51.08M$21,000$2.42M$4.42M$2.83M$2.12M$970,000$132.01M$50,000$316,000$84.87M
    Operating Expenses$22.11M$21.05M$24.22M$42.66M$89.04M$68.41M$67.02M$67.48M$73.64M$81.58M$78.83M$74.56M
    R&D$8.80M$12.63M$14.59M$28.94M$40.52M$50.81M$50.17M$50.72M$57.51M$64.11M$61.89M$57.91M
    SG&A$10.90M$12.67M$12.65M$13.24M$15.91M$17.60M$16.85M$16.76M$16.13M$17.46M$16.94M$16.64M
    Operating Income$-21,101,000$30.04M$-24,203,000$-40,240,000$-84,616,000$-65,581,000$-64,897,000$-66,513,000$58.38M$-81,528,000$-78,515,000$10.31M
    Interest Income$0$0$0$0$0$0$0$0$0$0$0$0
    Interest Expense$-2,553,000$-2,416,000$-2,646,000$-3,351,000$-3,794,000$-4,348,000$-5,387,000$-6,743,000$-6,521,000$-7,165,000$-8,102,000$-8,522,000
    Income Before Tax$-18,581,000$32.72M$-21,579,000$-36,912,000$-80,965,000$-61,373,000$-59,501,000$-59,836,000$64.85M$-74,440,000$-70,618,000$18.82M
    Income Tax Expense$2,000$1,000$10,000$-371,000$44.80M$-1,178,000$-1,545,000$-835,000$-2,039,000$-2,201,000$-3,142,000$-3,092,000
    Net Income$-18,583,000$32.72M$-21,589,000$-36,541,000$-125,767,000$-60,195,000$-57,956,000$-59,001,000$66.89M$-72,239,000$-67,476,000$21.91M
    EBITDA$-20,937,000$30.49M$-24,007,000$-40,034,000$-84,534,000$-64,812,000$-64,667,000$-66,353,000$58.56M$-81,390,000$-76,181,000$12.61M
    EBIT$-21,134,000$30.31M$-24,225,000$-40,263,000$-84,759,000$-65,721,000$-64,888,000$-66,579,000$58.33M$-81,605,000$-78,720,000$10.29M
    * Some calculated fields are derived from available data when not provided by source

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    News

    Prothena (NASDAQ:PRTA) Major Shareholder Buys 50,000 Shares of Stock

    Prothena (NASDAQ:PRTA) major shareholder William Scully recently purchased 50,000 shares of the company's stock for $439,500, increasing his total holdings to 800,000 shares. This transaction comes as Prothena's stock rose to $9.44 and the company reported better-than-expected quarterly earnings with an adjusted loss of $0.32 per share. Analysts generally maintain a "Moderate Buy" rating for Prothena, with an average price target of $23.75.

    MarketBeat•8/21/26•
    Bullish

    Prothena (NASDAQ:PRTA) Shares Pass Below Two Hundred Day Moving Average - Should You Sell?

    Prothena (NASDAQ:PRTA) shares have fallen below their 200-day moving average, trading at $8.71 against the $9.37 average. Despite this, analysts maintain a "Moderate Buy" consensus with a $23.75 target price, and the company recently beat EPS and revenue expectations. Insider activity over the past 90 days shows net buying.

    MarketBeat•8/19/26•
    Neutral

    Precision Trading with Prothena Corporation Plc (PRTA) Risk Zones

    This article from Stock Traders Daily provides a detailed AI-driven analysis of Prothena Corporation Plc (PRTA), highlighting strong near-term sentiment but a neutral mid and long-term outlook. It outlines specific institutional trading strategies (Long, Momentum Breakout, and Risk Hedging) with entry/target/stop-loss zones, and presents multi-timeframe signal analysis including support and resistance levels. The analysis emphasizes risk management and predictive AI models for precision trading.

    Stock Traders Daily•8/12/26•
    Neutral

    Precision Trading with Prothena Corporation Plc (PRTA) Risk Zones

    This article provides a precision trading analysis for Prothena Corporation Plc (PRTA), highlighting a mid-channel oscillation pattern and a significant risk-reward short setup. It details three AI-generated institutional trading strategies—Position Trading, Momentum Breakout, and Risk Hedging—with specific entry, target, and stop-loss zones. The analysis also includes multi-timeframe signal analysis, noting strong near-term sentiment while mid and long-term outlooks are neutral.

    Stock Traders Daily•8/12/26•
    Neutral

    Prothena files initial beneficial ownership statement for Todd W. Fennell

    Prothena has filed an initial beneficial ownership statement (Form 3) for Todd W. Fennell, who is listed as a 10% owner. The filing, dated August 6, 2026, indicates that Fennell beneficially owns no securities, with no non-derivative or derivative holdings reported. The form was signed on August 11, 2026, by Reid E. Buchanan under power of attorney for Fennell.

    Bitget•8/11/26•
    Neutral

    Frequently Asked Questions About PRTA

    Does PRTA pay dividends?
    Prothena Corporation plc (PRTA) does not currently pay a regular dividend.
    What is PRTA's market cap?
    Prothena Corporation plc (PRTA) has a market capitalization of $478.97M with a current stock price of $9.35.

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