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 profit margin
Profit margin (net margin) is net income as a percentage of revenue.
Prothena Corp Public's profit margin for the twelve months ending Sep 30, 2026 was -45.4%. For fiscal 2025 it was -2520.6%, against -90.5% the year before. The highest annual figure on record is 33.4% in fiscal 2021.
Annual profit margin
| Period | Period end | Value | Change (pts) |
|---|---|---|---|
| FY2025 | Dec 31, 2025 | -2520.6% | −2430.1 |
| FY2024 | Dec 31, 2024 | -90.5% | +70.4 |
| FY2023 | Dec 31, 2023 | -160.9% | +56.0 |
| FY2022 | Dec 31, 2022 | -217.0% | −250.3 |
| FY2021 | Dec 31, 2021 | 33.4% | +13063.2 |
| FY2020 | Dec 31, 2020 | -13029.8% | −3487.1 |
| FY2019 | Dec 31, 2019 | -9542.6% | +6755.3 |
| FY2018 | Dec 31, 2018 | -16297.9% | −15741.1 |
| FY2017 | Dec 31, 2017 | -556.8% | +14619.3 |
| FY2016 | Dec 31, 2016 | -15176.1% | −10159.8 |
| FY2015 | Dec 31, 2015 | -5016.3% | −5002.2 |
| FY2014 | Dec 31, 2014 | -14.1% | +6050.4 |
| FY2013 | Dec 31, 2013 | -6064.5% | −4506.5 |
| FY2012 | Dec 31, 2012 | -1558.0% | – |
Quarterly profit margin
Change is against the same quarter a year earlier.
| Period | Period end | Value | Change (pts) |
|---|---|---|---|
| Q3 FY2026 | Sep 30, 2026 | -2662.7% | −1149.7 |
| Q2 FY2026 | Jun 30, 2026 | -1839.9% | +1005.5 |
| Q1 FY2026 | Mar 31, 2026 | 64.1% | +2192.6 |
| Q4 FY2025 | Dec 31, 2025 | -102804.8% | −100074.9 |
| Q3 FY2025 | Sep 30, 2025 | -1513.1% | +4569.5 |
| Q2 FY2025 | Jun 30, 2025 | -2845.4% | −2896.1 |
| Q1 FY2025 | Mar 31, 2025 | -2128.5% | +142349.5 |
| Q4 FY2024 | Dec 31, 2024 | -2729.9% | +18623.3 |
| Q3 FY2024 | Sep 30, 2024 | -6082.6% | −6108.4 |
| Q2 FY2024 | Jun 30, 2024 | 50.7% | +1409.1 |
| Q1 FY2024 | Mar 31, 2024 | -144478.0% | −142317.4 |
| Q4 FY2023 | Dec 31, 2023 | -21353.2% | −21365.9 |
| Q3 FY2023 | Sep 30, 2023 | 25.8% | +3042.6 |
| Q2 FY2023 | Jun 30, 2023 | -1358.4% | +1785.2 |
| Q1 FY2023 | Mar 31, 2023 | -2160.6% | +986.8 |
| Q4 FY2022 | Dec 31, 2022 | 12.7% | +2843.7 |
| Q3 FY2022 | Sep 30, 2022 | -3016.7% | −3095.2 |
| Q2 FY2022 | Jun 30, 2022 | -3143.6% | −3189.6 |
| Q1 FY2022 | Mar 31, 2022 | -3147.4% | +19811.9 |
| Q4 FY2021 | Dec 31, 2021 | -2831.0% | +5701.2 |
| Q3 FY2021 | Sep 30, 2021 | 78.5% | +19554.3 |
| Q2 FY2021 | Jun 30, 2021 | 46.0% | +13524.0 |
| Q1 FY2021 | Mar 31, 2021 | -22959.4% | −6243.8 |
| Q4 FY2020 | Dec 31, 2020 | -8532.2% | −112.7 |
| Q3 FY2020 | Sep 30, 2020 | -19475.8% | −9989.0 |
| Q2 FY2020 | Jun 30, 2020 | -13477.9% | −4010.9 |
| Q1 FY2020 | Mar 31, 2020 | -16715.6% | −5497.9 |
| Q4 FY2019 | Dec 31, 2019 | -8419.5% | +3158.3 |
| Q3 FY2019 | Sep 30, 2019 | -9486.8% | +144.2 |
| Q2 FY2019 | Jun 30, 2019 | -9467.1% | +11996.0 |
| Q1 FY2019 | Mar 31, 2019 | -11217.7% | +10254.9 |
| Q4 FY2018 | Dec 31, 2018 | -11577.8% | +9277.2 |
| Q3 FY2018 | Sep 30, 2018 | -9631.0% | +14293.2 |
| Q2 FY2018 | Jun 30, 2018 | -21463.1% | −21397.1 |
| Q1 FY2018 | Mar 31, 2018 | -21472.7% | −7810.9 |
| Q4 FY2017 | Dec 31, 2017 | -20855.0% | +7743.2 |
| Q3 FY2017 | Sep 30, 2017 | -23924.2% | – |
| Q2 FY2017 | Jun 30, 2017 | -66.0% | – |
| Q1 FY2017 | Mar 31, 2017 | -13661.8% | – |
| Q4 FY2016 | Dec 31, 2016 | -28598.2% | – |
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