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    P

    Prothena Corporation plc (PRTA)

    Official site

    HEALTHCARE • BIOTECHNOLOGY • NASDAQ

    $8.37
    +0.01 (+0.12%)

    Market Cap: $429.69M

    Last updated: Oct 16, 2026 at 1:55 PM ET

    Earnings

    Performance (10Y)

    Beat Rate
    49%(19/39)
    Avg Surprise
    +16.58%
    Streak
    3 Q

    Upcoming Estimates

    Period ending Sep 30, 2026
    EPS Consensus$-0.38
    Range$-0.38 - $-0.38
    1 analysts
    EPS Revisions
    1
    0
    7d
    1
    0
    30d
    EPS Estimate DriftChange to current
    90d ago$-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
    Period ending 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
    Reported Aug 6
    		$-0.32$-0.39+17.95%Beat+81.5%
    Mar 26
    Reported May 7
    		$0.68$-0.30+326.67%Beat+160.7%
    Dec 25
    Reported Feb 19
    		$-0.46$-0.46+0.00%Beat+57.4%
    Sep 25
    Reported Nov 6
    		$-0.67$-0.54-24.07%Miss+39.1%
    Jun 25
    Reported Aug 4
    		$-1.73$-1.79+3.35%Beat-241.8%
    Mar 25
    Reported May 8
    		$-1.12$-1.03-8.74%Miss+16.4%
    Dec 24
    Reported Feb 20
    		$-1.08$-1.04-3.85%Miss+14.3%
    Sep 24
    Reported Nov 12
    		$-1.10$-1.18+6.78%Beat-389.5%
    Jun 24
    Reported Aug 8
    		$1.22$-1.03+218.45%Beat+218.4%
    Mar 24
    Reported May 8
    		$-1.34$-1.22-9.84%Miss-50.6%
    Dec 23
    Reported Feb 15
    		$-1.26$-1.19-5.88%Miss-1150.0%
    Sep 23
    Reported Nov 2
    		$0.38$-0.34+211.76%Beat+139.2%
    Jun 23
    Reported Aug 3
    		$-1.03$-0.97-6.19%Miss-17.0%
    Mar 23
    Reported May 4
    		$-0.89$-0.84-5.95%Miss-14.1%
    Dec 22
    Reported Feb 23
    		$0.12N/A+125.53%Beat+116.9%
    Sep 22
    Reported Nov 3
    		$-0.97$-0.62-56.45%Miss-145.5%
    Jun 22
    Reported Aug 8
    		$-0.88$-0.53-66.04%Miss-251.7%
    Mar 22
    Reported May 5
    		$-0.78$-0.64-21.88%Miss+14.3%
    Dec 21
    Reported Feb 17
    		$-0.71$-0.44-61.36%Miss+7.8%
    Sep 21
    Reported Nov 4
    		$2.13$2.24-4.91%Miss+376.6%
    Jun 21
    Reported Aug 5
    		$0.58N/A-50.43%Miss+187.9%
    Mar 21
    Reported May 11
    		$-0.91$-0.49-85.71%Miss-54.2%
    Dec 20
    Reported Feb 11
    		$-0.77$-0.74-4.05%Miss-42.6%
    Sep 20
    Reported Nov 4
    		$-0.77$-0.65-18.46%Miss-57.1%
    Jun 20
    Reported Aug 6
    		$-0.66$-0.59-11.86%Miss-65.0%
    Mar 20
    Reported May 6
    		$-0.59$-0.56-5.36%Miss-13.5%
    Dec 19
    Reported Feb 12
    		$-0.54$-0.55+1.82%Beat+10.0%
    Sep 19
    Reported Nov 5
    		$-0.49$-0.46-6.52%Miss+30.0%
    Jun 19
    Reported Aug 6
    		$-0.40$-0.58+31.03%Beat+60.0%
    Mar 19
    Reported May 7
    		$-0.52$-0.59+11.86%Beat+58.7%
    Dec 18
    Reported Feb 14
    		$-0.60$-0.89+32.58%Beat+51.6%
    Sep 18
    Reported Nov 6
    		$-0.70$-0.82+14.63%Beat+48.9%
    Jun 18
    Reported Aug 7
    		$-1.00$-1.24+19.35%Beat-117.4%
    Mar 18
    Reported May 8
    		$-1.26$-1.34+5.97%Beat-27.3%
    Dec 17
    Reported Feb 14
    		$-1.24$-1.48+16.22%Beat+12.1%
    Sep 17
    Reported Nov 7
    		$-1.37$-1.46+6.16%Beat-
    Jun 17
    Reported Aug 8
    		$-0.46$-0.81+43.21%Beat-
    Mar 17
    Reported May 9
    		$-0.99$-1.36+27.21%Beat-
    Dec 16
    Reported Feb 14
    		$-1.41$-1.21-16.53%Miss-

    Key Metrics

    Valuation
    P/E Ratio-10.87EV/EBITDAN/A
    Price/FCF-7.19xFCF Yield-13.91%
    Profitability
    Profit Margin-80.70%Operating Margin-1850.00%
    ROE-14.40%ROICN/A
    Financial Health
    Debt/Equity0.00xInterest Coverage5.04x
    Current Ratio25.05xQuick Ratio25.05x
    Trading Statistics
    Beta-0.29Avg Volume593.70K
    52-Week High$11.8052-Week Low$7.73

    Technical Indicators Dashboard

    Moving Averages

    SMA 10$8.43
    SMA 20$8.50
    SMA 50$8.87
    SMA 200$9.28
    EMA 10$8.46
    EMA 20$8.55
    EMA 50$8.76
    EMA 200$9.12

    MACD

    Line: -0.13Signal: -0.14Hist: 0.02

    ADX

    ADX: 12.2+DI: 20.9-DI: 20.5

    Aroon & PSAR

    Aroon UpN/A
    Aroon Down76.0
    PSAR$7.89

    Bollinger Bands

    Upper Band$8.95
    Lower Band$8.05
    %B Position1065%(Upper)
    Band Width0.36

    RSI (14-Day)

    Neutral
    45.6

    Momentum Oscillators

    Stoch %K39.0
    Stoch %D48.8
    Williams %R-62.1
    ROC (10d)-0.1%
    Momentum-0.01
    CCI (20d)-52.6
    MFI (14d)47.4

    Volatility Measures

    ATR (14d)$0.44(5.3%)
    StdDev (20d)0.23
    Hist Vol51.7%(High)

    Volume Flow

    VWAP$8.37
    OBV-3.2M
    AD Line-26.8M
    CMF (20d)0.080

    Volume Metrics

    Avg Vol (20d)617.0K
    Vol Ratio1.0x
    VWMA (20d)$8.51

    Pivot Points

    R3$8.89
    R2$8.72
    R1$8.54
    Pivot Point$8.37
    S1$8.19
    S2$8.02
    S3$7.84

    Advanced Oscillators

    TSI-8.30
    Ultimate Osc48.8
    KST-61.05

    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

    Form 4 PROTHENA CORP PUBLIC LTD CO: William P. Scully (10% Owner) For: 13 October

    This article reports a Form 4 filing for Prothena Corp Public Ltd Co, indicating that William P. Scully, identified as a 10% owner...

    Investing.com Australia•10/16/26•Neutral

    William Scully buys 90,000 shares in Prothena stock

    William Scully, a major shareholder in Prothena, acquired 90,000 additional shares on October 8, 2026, increasing his direct ownership to 529,000 shares. This transaction followed Prothena's Q2 earnings report where...

    ad-hoc-news.de•10/15/26•Somewhat-Bullish

    (PRTA) Risk Channels and Responsive Allocation

    This article provides a detailed AI-driven analysis of Prothena Corporation Plc (NASDAQ: PRTA), highlighting a positive near-term sentiment that may be shifting due to broader weak alignment and a mid-channel oscillation...

    Stock Traders Daily•10/13/26•Somewhat-Bearish

    Prothena development chief resigns: what it means for Prothena stock

    Prothena's chief development officer, Chad Swanson, resigned effective October 9, 2026, to lead a partnered program with a strategic partner...

    ad-hoc-news.de•10/13/26•Neutral

    Form 4 PROTHENA CORP PUBLIC LTD CO For: 11 October By Investing.com

    This article provides a brief announcement regarding the filing of Form 4 for PROTHENA CORP PUBLIC LTD CO on October 11. It includes the stock symbol PRTA and mentions a 2.67% increase. The content primarily serves as...

    Investing.com Nigeria•10/11/26•Neutral

    PRTA Valuation and Fair Value

    P/E
    -10.9x
    Forward P/E
    10.6x
    P/FCF
    -7.2x
    PEG
    0.8x
    P/B
    1.5x
    See GNG's fair value

    PRTA Profitability: Margins, ROIC and FCF

    Gross margin
    100.0%
    Operating margin
    -1850.0%
    Net margin
    -80.7%
    ROE
    -14.4%
    FCF margin
    -111.3%
    FCF yield
    -13.9%

    PRTA Competitors

    CompanyTicker
    Neuropace IncNPCE
    Cross Country Healthcare IncCCRN
    Entera Bio LtdENTX
    Ovid Therapeutics IncOVID
    XOMA Royalty CorporationXOMAP
    Zura Bio Limited Class A Ordinary SharesZURA
    XOMA CorporationXOMAO
    Community Health Systems IncCYH

    Sector: Healthcare

    PRTA Analyst Ratings

    Consensus
    Hold
    Analysts
    6
    Strong Buy
    2
    Buy
    1
    Hold
    2
    Sell
    0
    Strong Sell
    1

    PRTA Bull Case vs Bear Case

    Bear case

    • PRTA has a -80.7% net profit margin.
    • PRTA's quarterly revenue changed -77.1% year over year.

    PRTA Earnings: Beat Rate and Next Report

    Beat rate
    4 of 8 quarters (50.0%)
    Average surprise
    39.8%
    EPS estimate (fiscal period ending Sep 30, 2026)
    $-0.38
    Estimate revisions (30 days, fiscal period ending Sep 30, 2026)
    1 up, 0 down

    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 $429.69M with a current stock price of $8.37.

    Related stocks

    Sector: Healthcare

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