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 cash
Cash and short-term investments held at the end of each period.
Prothena Corp Public's cash was $271.37M at Sep 30, 2026. For fiscal 2025 it was $307.53M, down 34.9% from the year before. Over ten years it grew -1.8% a year on average. The highest annual figure on record is $712.62M in fiscal 2022.
Annual cash
| Period | Period end | Value | Change |
|---|---|---|---|
| FY2025 | Dec 31, 2025 | $307.53M | -34.9% |
| FY2024 | Dec 31, 2024 | $472.25M | -23.7% |
| FY2023 | Dec 31, 2023 | $618.83M | -13.2% |
| FY2022 | Dec 31, 2022 | $712.62M | +22.8% |
| FY2021 | Dec 31, 2021 | $580.45M | +94.7% |
| FY2020 | Dec 31, 2020 | $298.08M | -21.2% |
| FY2019 | Dec 31, 2019 | $378.43M | -12.3% |
| FY2018 | Dec 31, 2018 | $431.72M | +2.4% |
| FY2017 | Dec 31, 2017 | $421.68M | +7.9% |
| FY2016 | Dec 31, 2016 | $390.98M | +5.5% |
| FY2015 | Dec 31, 2015 | $370.59M | +26.2% |
| FY2014 | Dec 31, 2014 | $293.58M | +66.2% |
| FY2013 | Dec 31, 2013 | $176.68M | +41.5% |
| FY2012 | Dec 31, 2012 | $124.86M | – |
| FY2011 | Dec 31, 2011 | $0 | – |
| FY2010 | Dec 31, 2010 | $0 | – |
Quarterly cash
Change is against the same quarter a year earlier.
| Period | Period end | Value | Change |
|---|---|---|---|
| Q3 FY2026 | Sep 30, 2026 | $271.37M | -18.0% |
| Q2 FY2026 | Jun 30, 2026 | $288.19M | -22.4% |
| Q1 FY2026 | Mar 31, 2026 | $329.46M | -21.2% |
| Q4 FY2025 | Dec 31, 2025 | $307.53M | -34.9% |
| Q3 FY2025 | Sep 30, 2025 | $330.84M | -36.3% |
| Q2 FY2025 | Jun 30, 2025 | $371.44M | -34.2% |
| Q1 FY2025 | Mar 31, 2025 | $417.94M | -23.5% |
| Q4 FY2024 | Dec 31, 2024 | $472.25M | -23.7% |
| Q3 FY2024 | Sep 30, 2024 | $519.26M | -22.6% |
| Q2 FY2024 | Jun 30, 2024 | $564.12M | -14.4% |
| Q1 FY2024 | Mar 31, 2024 | $546.51M | -20.4% |
| Q4 FY2023 | Dec 31, 2023 | $618.83M | -13.2% |
| Q3 FY2023 | Sep 30, 2023 | $670.90M | +35.4% |
| Q2 FY2023 | Jun 30, 2023 | $659.11M | +29.5% |
| Q1 FY2023 | Mar 31, 2023 | $686.18M | +26.4% |
| Q4 FY2022 | Dec 31, 2022 | $712.62M | +22.8% |
| Q3 FY2022 | Sep 30, 2022 | $495.63M | -17.4% |
| Q2 FY2022 | Jun 30, 2022 | $508.80M | +27.3% |
| Q1 FY2022 | Mar 31, 2022 | $542.99M | +58.3% |
| Q4 FY2021 | Dec 31, 2021 | $580.45M | +94.7% |
| Q3 FY2021 | Sep 30, 2021 | $600.10M | +90.8% |
| Q2 FY2021 | Jun 30, 2021 | $399.83M | +19.7% |
| Q1 FY2021 | Mar 31, 2021 | $342.99M | -2.7% |
| Q4 FY2020 | Dec 31, 2020 | $298.08M | -21.2% |
| Q3 FY2020 | Sep 30, 2020 | $314.53M | -19.4% |
| Q2 FY2020 | Jun 30, 2020 | $333.94M | -16.1% |
| Q1 FY2020 | Mar 31, 2020 | $352.69M | -14.0% |
| Q4 FY2019 | Dec 31, 2019 | $378.43M | -12.3% |
| Q3 FY2019 | Sep 30, 2019 | $390.30M | -13.6% |
| Q2 FY2019 | Jun 30, 2019 | $398.14M | -18.1% |
| Q1 FY2019 | Mar 31, 2019 | $410.11M | -4.4% |
| Q4 FY2018 | Dec 31, 2018 | $431.72M | +2.4% |
| Q3 FY2018 | Sep 30, 2018 | $451.51M | -1.0% |
| Q2 FY2018 | Jun 30, 2018 | $486.21M | +3.1% |
| Q1 FY2018 | Mar 31, 2018 | $429.04M | -15.3% |
| Q4 FY2017 | Dec 31, 2017 | $421.68M | +7.9% |
| Q3 FY2017 | Sep 30, 2017 | $456.06M | – |
| Q2 FY2017 | Jun 30, 2017 | $471.73M | – |
| Q1 FY2017 | Mar 31, 2017 | $506.55M | – |
| Q4 FY2016 | Dec 31, 2016 | $390.98M | – |
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