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PRTA

Prothena Corporation plc

Healthcare · USD

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Price alert · PRTA

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8.47 USD -0.41 -4.62%
As of Oct 30, 2026 Extended hours 8.47 0.00%
Bid
8.48 × 2
Ask
8.49 × 2
8.35 Day range 8.90
7.91 52-week range 11.51
YTD
-11.31%
1 year
-19.18%
Open
8.79
Prev close
8.88
Mkt cap
434.82M
Vol
452.30K
Avg vol
472.70K
EPS
-0.82
P/E
0.00
Div yield
0.00%
More statistics
Low
8.35
High
8.90
Forward P/E
-3.57
Beta
0.16
Short ratio
17.35
Inst. own
96.97%
Dividend
0.00
Ex-div date
50-d avg
15.72
200-d avg
20.26
1y target
49.75

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Financial health

Altman Z-Score

11.28 Safe zone

Bankruptcy-risk model: below 1.81 distress, above 2.99 safe.

Piotroski F-Score

3 / 9 Weak

Nine pass/fail tests of profitability, leverage and efficiency.

FMP rating

B-2 / 5 overall

  • DCF 3
  • Return on Equity 1
  • Return on Assets 1
  • Debt / Equity 4
  • P/E 1
  • P/B 4

Valuation

P/E -2.1×
FY 2016: -10.6×FY 2017: -9.2×FY 2018: -2.6×FY 2019: -8.1×FY 2020: -4.3×FY 2021: 32.7×FY 2022: -24.4×FY 2023: -13.2×FY 2024: -6.1×FY 2025: -2.1×
FY 2016 5y median -6.1× FY 2025
P/S 53.1×
FY 2016: 1602×FY 2017: 51.3×FY 2018: 427×FY 2019: 776×FY 2020: 562×FY 2021: 10.9×FY 2022: 52.9×FY 2023: 21.2×FY 2024: 5.5×FY 2025: 53.1×
FY 2016 5y median 21.2× FY 2025
P/B 1.8×
FY 2016: 4.6×FY 2017: 3.5×FY 2018: 1.3×FY 2019: 2.3×FY 2020: 2.6×FY 2021: 4.7×FY 2022: 4.6×FY 2023: 3.4×FY 2024: 1.5×FY 2025: 1.8×
FY 2016 5y median 3.4× FY 2025
P/FCF -3.1×
FY 2016: -12.6×FY 2017: -10.5×FY 2018: -13.6×FY 2019: -11.8×FY 2020: -6.0×FY 2021: 23.7×FY 2022: -26.1×FY 2023: -14.1×FY 2024: -5.0×FY 2025: -3.1×
FY 2016 5y median -5.0× FY 2025
EV/EBITDA -1.1×
FY 2016: -8.7×FY 2017: -6.9×FY 2018: -0.2×FY 2019: -3.5×FY 2020: -1.8×FY 2021: 22.2×FY 2022: -17.2×FY 2023: -8.3×FY 2024: -2.2×FY 2025: -1.1×
FY 2016 5y median -2.2× FY 2025
EV/Sales 22.8×
FY 2016: 1284×FY 2017: 38.0×FY 2018: 32.8×FY 2019: 342×FY 2020: 237×FY 2021: 8.1×FY 2022: 39.9×FY 2023: 14.5×FY 2024: 2.1×FY 2025: 22.8×
FY 2016 5y median 14.5× FY 2025
FCF Yield -31.8%
FY 2016: -7.9%FY 2017: -9.5%FY 2018: -7.4%FY 2019: -8.5%FY 2020: -16.8%FY 2021: 4.2%FY 2022: -3.8%FY 2023: -7.1%FY 2024: -20.2%FY 2025: -31.8%
FY 2016 5y median -7.1% FY 2025

Profitability

Gross Margin 61.8%
FY 2016: -11230.2%FY 2017: -388.9%FY 2018: -10495.1%FY 2019: -6145.2%FY 2020: -8678.9%FY 2021: 100.0%FY 2022: 100.0%FY 2023: 100.0%FY 2024: 100.0%FY 2025: 61.8%
FY 2016 5y median 100.0% FY 2025
Operating Margin -1905.8%
FY 2016: -15121.8%FY 2017: -564.2%FY 2018: -16634.0%FY 2019: -10527.9%FY 2020: -13216.2%FY 2021: 35.9%FY 2022: -244.1%FY 2023: -209.1%FY 2024: -114.4%FY 2025: -1905.8%
FY 2016 5y median -209.1% FY 2025
Net Margin -2520.6%
FY 2016: -15176.1%FY 2017: -556.8%FY 2018: -16297.9%FY 2019: -9542.6%FY 2020: -13029.8%FY 2021: 33.4%FY 2022: -217.0%FY 2023: -160.9%FY 2024: -90.5%FY 2025: -2520.6%
FY 2016 5y median -160.9% FY 2025
ROE -87.0%
FY 2016: -43.8%FY 2017: -37.6%FY 2018: -48.2%FY 2019: -28.5%FY 2020: -60.4%FY 2021: 14.4%FY 2022: -18.8%FY 2023: -26.2%FY 2024: -25.1%FY 2025: -87.0%
FY 2016 5y median -25.1% FY 2025
ROIC -63.9%
FY 2016: -38.1%FY 2017: -32.8%FY 2018: -32.6%FY 2019: -21.1%FY 2020: -36.1%FY 2021: 11.5%FY 2022: -17.1%FY 2023: -27.3%FY 2024: -29.3%FY 2025: -63.9%
FY 2016 5y median -27.3% FY 2025
ROA -74.7%
FY 2016: -34.8%FY 2017: -30.9%FY 2018: -31.2%FY 2019: -18.5%FY 2020: -33.4%FY 2021: 11.0%FY 2022: -15.4%FY 2023: -21.1%FY 2024: -22.4%FY 2025: -74.7%
FY 2016 5y median -21.1% FY 2025

Growth (YoY)

Revenue -92.8%
FY 2016: -34.3%FY 2017: 2508.4%FY 2018: -96.5%FY 2019: -14.8%FY 2020: 4.8%FY 2021: 23414.3%FY 2022: -73.1%FY 2023: 69.5%FY 2024: 47.9%FY 2025: -92.8%
FY 2016 FY 2025
Operating Income -19.4%
FY 2016: -99.6%FY 2017: 2.7%FY 2018: -2.3%FY 2019: 46.1%FY 2020: -31.5%FY 2021: 163.8%FY 2022: -282.8%FY 2023: -45.2%FY 2024: 19.1%FY 2025: -19.4%
FY 2016 FY 2025
EPS (diluted) -99.6%
FY 2016: -75.2%FY 2017: 12.7%FY 2018: 3.4%FY 2019: 50.4%FY 2020: -42.6%FY 2021: 149.6%FY 2022: -279.0%FY 2023: -11.7%FY 2024: 17.8%FY 2025: -99.6%
FY 2016 FY 2025
Free Cash Flow -8.9%
FY 2016: -109.8%FY 2017: -0.7%FY 2018: 77.7%FY 2019: -78.2%FY 2020: -50.5%FY 2021: 214.2%FY 2022: -218.7%FY 2023: -25.1%FY 2024: -10.0%FY 2025: -8.9%
FY 2016 FY 2025

Financial Health

Current Ratio 7.7×
FY 2016: 9.5×FY 2017: 11.4×FY 2018: 28.9×FY 2019: 21.4×FY 2020: 11.6×FY 2021: 17.5×FY 2022: 14.3×FY 2023: 11.2×FY 2024: 10.0×FY 2025: 7.7×
FY 2016 5y median 11.2× FY 2025
Quick Ratio 7.7×
FY 2016: 9.5×FY 2017: 11.4×FY 2018: 28.9×FY 2019: 21.4×FY 2020: 11.6×FY 2021: 17.5×FY 2022: 14.3×FY 2023: 11.2×FY 2024: 10.0×FY 2025: 7.7×
FY 2016 5y median 11.2× FY 2025
Debt / Equity 0.0×
FY 2016: 0.1×FY 2017: 0.1×FY 2018: 0.2×FY 2019: 0.1×FY 2020: 0.1×FY 2021: 0.0×FY 2022: 0.0×FY 2023: 0.0×FY 2024: 0.0×FY 2025: 0.0×
FY 2016 5y median 0.0× FY 2025
Net Debt / EBITDA 1.5×
FY 2016: 2.1×FY 2017: 2.4×FY 2018: 2.5×FY 2019: 4.5×FY 2020: 2.5×FY 2021: -7.8×FY 2022: 5.6×FY 2023: 3.8×FY 2024: 3.6×FY 2025: 1.5×
FY 2016 5y median 3.6× FY 2025
Interest Coverage 0.0×
FY 2016: -185×FY 2017: -42.1×FY 2018: -43.0×FY 2019: 0.0×FY 2020: 0.0×FY 2021: 0.0×FY 2022: 0.0×FY 2023: 0.0×FY 2024: 0.0×FY 2025: 0.0×
FY 2016 5y median 0.0× FY 2025

Dividends

Dividend Yield 0.0%
FY 2016: 0.0%FY 2017: 0.0%FY 2018: 0.0%FY 2019: 0.0%FY 2020: 0.0%FY 2021: 0.0%FY 2022: 0.0%FY 2023: 0.0%FY 2024: 0.0%FY 2025: 0.0%
FY 2016 5y median 0.0% FY 2025
Payout Ratio 0.0%
FY 2016: 0.0%FY 2017: 0.0%FY 2018: 0.0%FY 2019: 0.0%FY 2020: 0.0%FY 2021: 0.0%FY 2022: 0.0%FY 2023: 0.0%FY 2024: 0.0%FY 2025: 0.0%
FY 2016 5y median 0.0% FY 2025

Annual · latest fiscal year ends 2025-12-31