Prothena Corp Public Ltd Co (PRTA) stock
PRTANasdaqPharmaceutical PreparationsFiscal year ends December 31
Financials through Q3 FY2026, quarter ended Sep 30, 2026Last filing: 10-Q on Nov 5, 2026Score 12/3017% below fair value
$8.16−0.07 (-0.85%)
Close on Nov 13, 2026Market cap $418.91MP/E –Yield –
Prothena Corp Public operating margin
Operating margin is operating income as a percentage of revenue.
Prothena Corp Public's operating margin for the twelve months ending Sep 30, 2026 was -64.6%. For fiscal 2025 it was -2216.4%, against -114.4% the year before. The highest annual figure on record is 35.9% in fiscal 2021.
Annual operating margin
| Period | Period end | Value | Change (pts) |
|---|---|---|---|
| FY2025 | Dec 31, 2025 | -2216.4% | −2102.1 |
| FY2024 | Dec 31, 2024 | -114.4% | +94.7 |
| FY2023 | Dec 31, 2023 | -209.1% | +35.0 |
| FY2022 | Dec 31, 2022 | -244.1% | −279.9 |
| FY2021 | Dec 31, 2021 | 35.9% | +13252.1 |
| FY2020 | Dec 31, 2020 | -13216.2% | −2688.3 |
| FY2019 | Dec 31, 2019 | -10527.9% | +6106.1 |
| FY2018 | Dec 31, 2018 | -16634.0% | −16069.9 |
| FY2017 | Dec 31, 2017 | -564.2% | +14557.6 |
| FY2016 | Dec 31, 2016 | -15121.8% | −10147.5 |
| FY2015 | Dec 31, 2015 | -4974.3% | −4961.2 |
| FY2014 | Dec 31, 2014 | -13.1% | +5967.3 |
| FY2013 | Dec 31, 2013 | -5980.3% | −4422.4 |
| FY2012 | Dec 31, 2012 | -1557.9% | – |
Quarterly operating margin
Change is against the same quarter a year earlier.
| Period | Period end | Value | Change (pts) |
|---|---|---|---|
| Q3 FY2026 | Sep 30, 2026 | -3035.6% | −1369.4 |
| Q2 FY2026 | Jun 30, 2026 | -2089.2% | −174.8 |
| Q1 FY2026 | Mar 31, 2026 | 58.8% | +2377.8 |
| Q4 FY2025 | Dec 31, 2025 | -115252.4% | −112195.5 |
| Q3 FY2025 | Sep 30, 2025 | -1666.3% | +5190.8 |
| Q2 FY2025 | Jun 30, 2025 | -1914.4% | −1958.6 |
| Q1 FY2025 | Mar 31, 2025 | -2319.0% | +160737.0 |
| Q4 FY2024 | Dec 31, 2024 | -3056.9% | +21789.7 |
| Q3 FY2024 | Sep 30, 2024 | -6857.0% | −6869.2 |
| Q2 FY2024 | Jun 30, 2024 | 44.2% | +1699.0 |
| Q1 FY2024 | Mar 31, 2024 | -163056.0% | −160459.2 |
| Q4 FY2023 | Dec 31, 2023 | -24846.5% | −24846.4 |
| Q3 FY2023 | Sep 30, 2023 | 12.1% | +3330.0 |
| Q2 FY2023 | Jun 30, 2023 | -1654.7% | +1638.6 |
| Q1 FY2023 | Mar 31, 2023 | -2596.8% | +694.1 |
| Q4 FY2022 | Dec 31, 2022 | -0.1% | +2823.4 |
| Q3 FY2022 | Sep 30, 2022 | -3317.9% | −3396.3 |
| Q2 FY2022 | Jun 30, 2022 | -3293.4% | −3339.9 |
| Q1 FY2022 | Mar 31, 2022 | -3290.9% | +16777.2 |
| Q4 FY2021 | Dec 31, 2021 | -2823.5% | +5595.3 |
| Q3 FY2021 | Sep 30, 2021 | 78.5% | +19725.6 |
| Q2 FY2021 | Jun 30, 2021 | 46.5% | +13755.2 |
| Q1 FY2021 | Mar 31, 2021 | -20068.1% | −2445.4 |
| Q4 FY2020 | Dec 31, 2020 | -8418.9% | +672.5 |
| Q3 FY2020 | Sep 30, 2020 | -19647.1% | −9416.9 |
| Q2 FY2020 | Jun 30, 2020 | -13708.7% | −2632.7 |
| Q1 FY2020 | Mar 31, 2020 | -17622.7% | −5281.8 |
| Q4 FY2019 | Dec 31, 2019 | -9091.4% | +2638.0 |
| Q3 FY2019 | Sep 30, 2019 | -10230.2% | −691.8 |
| Q2 FY2019 | Jun 30, 2019 | -11076.0% | +11529.3 |
| Q1 FY2019 | Mar 31, 2019 | -12340.9% | +9116.4 |
| Q4 FY2018 | Dec 31, 2018 | -11729.4% | +8933.1 |
| Q3 FY2018 | Sep 30, 2018 | -9538.4% | +14906.3 |
| Q2 FY2018 | Jun 30, 2018 | -22605.4% | −22537.7 |
| Q1 FY2018 | Mar 31, 2018 | -21457.3% | −7453.0 |
| Q4 FY2017 | Dec 31, 2017 | -20662.4% | +8154.5 |
| Q3 FY2017 | Sep 30, 2017 | -24444.7% | – |
| Q2 FY2017 | Jun 30, 2017 | -67.6% | – |
| Q1 FY2017 | Mar 31, 2017 | -14004.2% | – |
| Q4 FY2016 | Dec 31, 2016 | -28817.0% | – |
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