Prothena Corp Public annual return on equity
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2025
Prothena Corp Public Return on Equity (ROE) Growth & History (PRTA)
Prothena Corp Public's return on equity was −63.62% for fiscal 2025.
View full Prothena Corp Public company overviewProthena Corp Public annual return on equity history
| Fiscal year | Period ended | Return on equity | Change (percentage points) |
|---|---|---|---|
| 2025 | 2025-12-31 | −63.62% | −40.28 pp |
| 2024 | 2024-12-31 | −23.34% | +1.51 pp |
| 2023 | 2023-12-31 | −24.85% | −3.35 pp |
| 2022 | 2022-12-31 | −21.50% | −42.10 pp |
| 2021 | 2021-12-31 | 20.61% | +69.25 pp |
| 2020 | 2020-12-31 | −48.65% | −22.58 pp |
| 2019 | 2019-12-31 | −26.07% | +16.56 pp |
| 2018 | 2018-12-31 | −42.63% | −2.96 pp |
| 2017 | 2017-12-31 | −39.67% | +4.43 pp |
| 2016 | 2016-12-31 | −44.10% | −19.32 pp |
| 2015 | 2015-12-31 | −24.78% | −21.69 pp |
| 2014 | 2014-12-31 | −3.09% | +24.27 pp |
| 2013 | 2013-12-31 | −27.35% | +41.64 pp |
| 2012 | 2012-12-31 | −68.99% | — |
Prothena Corp Public quarterly return on equity
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| Fiscal quarter | Period ended | Return on equity | Change (percentage points) |
|---|---|---|---|
| Q2 2026 | 2026-06-30 | −6.20% | +26.81 pp |
| Q1 2026 | 2026-03-31 | 11.03% | +24.05 pp |
| Q4 2025 | 2025-12-31 | −7.50% | +3.85 pp |
| Q3 2025 | 2025-09-30 | −11.80% | −1.23 pp |
| Q2 2025 | 2025-06-30 | −33.01% | −45.35 pp |
| Q1 2025 | 2025-03-31 | −13.02% | +0.56 pp |
| Q4 2024 | 2024-12-31 | −11.35% | +0.10 pp |
| Q3 2024 | 2024-09-30 | −10.57% | −14.23 pp |
| Q2 2024 | 2024-06-30 | 12.34% | +21.52 pp |
| Q1 2024 | 2024-03-31 | −13.58% | −5.96 pp |
| Q4 2023 | 2023-12-31 | −11.45% | −12.69 pp |
| Q3 2023 | 2023-09-30 | 3.65% | +14.93 pp |
| Q2 2023 | 2023-06-30 | −9.18% | +0.57 pp |
| Q1 2023 | 2023-03-31 | −7.62% | +0.40 pp |
| Q4 2022 | 2022-12-31 | 1.24% | +8.17 pp |
| Q3 2022 | 2022-09-30 | −11.27% | −39.33 pp |
| Q2 2022 | 2022-06-30 | −9.75% | −20.32 pp |
| Q1 2022 | 2022-03-31 | −8.02% | +9.53 pp |
| Q4 2021 | 2021-12-31 | −6.94% | +8.67 pp |
| Q3 2021 | 2021-09-30 | 28.06% | +41.83 pp |
| Q2 2021 | 2021-06-30 | 10.57% | +21.31 pp |
| Q1 2021 | 2021-03-31 | −17.55% | −8.62 pp |
| Q4 2020 | 2020-12-31 | −15.61% | −7.94 pp |
| Q3 2020 | 2020-09-30 | −13.77% | −7.20 pp |
| Q2 2020 | 2020-06-30 | −10.74% | −5.60 pp |
| Q1 2020 | 2020-03-31 | −8.93% | −2.36 pp |
| Q4 2019 | 2019-12-31 | −7.67% | −0.89 pp |
| Q3 2019 | 2019-09-30 | −6.57% | +0.49 pp |
| Q2 2019 | 2019-06-30 | −5.14% | +10.50 pp |
| Q1 2019 | 2019-03-31 | −6.57% | +5.37 pp |
| Q4 2018 | 2018-12-31 | −6.78% | +4.41 pp |
| Q3 2018 | 2018-09-30 | −7.06% | +4.17 pp |
| Q2 2018 | 2018-06-30 | −15.64% | −12.04 pp |
| Q1 2018 | 2018-03-31 | −11.94% | −3.72 pp |
| Q4 2017 | 2017-12-31 | −11.19% | +1.57 pp |
| Q3 2017 | 2017-09-30 | −11.23% | −0.83 pp |
| Q2 2017 | 2017-06-30 | −3.60% | +5.42 pp |
| Q1 2017 | 2017-03-31 | −8.21% | −1.55 pp |
| Q4 2016 | 2016-12-31 | −12.76% | −6.22 pp |
| Q3 2016 | 2016-09-30 | −10.39% | −4.45 pp |
| Q2 2016 | 2016-06-30 | −9.02% | −3.59 pp |
| Q1 2016 | 2016-03-31 | −6.66% | −1.30 pp |
| Q4 2015 | 2015-12-31 | −6.54% | −2.11 pp |
| Q3 2015 | 2015-09-30 | −5.94% | −1.55 pp |
| Q2 2015 | 2015-06-30 | −5.43% | −5.96 pp |
| Q1 2015 | 2015-03-31 | −5.36% | −15.11 pp |
| Q4 2014 | 2014-12-31 | −4.43% | +3.69 pp |
| Q3 2014 | 2014-09-30 | −4.39% | +5.01 pp |
| Q2 2014 | 2014-06-30 | 0.52% | +10.57 pp |
| Q1 2014 | 2014-03-31 | 9.75% | +17.08 pp |
| Q4 2013 | 2013-12-31 | −8.13% | — |
| Q3 2013 | 2013-09-30 | −9.41% | — |
| Q2 2013 | 2013-06-30 | −10.05% | — |
| Q1 2013 | 2013-03-31 | −7.33% | — |
Prothena Corp Public return on equity trends
Over the last five fiscal years, Prothena Corp Public's return on equity decreased from −48.65% to −63.62%, a change of −14.97 percentage points. The latest reported quarter, Q2 2026, shows −6.20%.
About the metric
What return on equity (ROE) means
Return on equity (ROE) measures how much net income a company generates relative to shareholders’ equity. It can help evaluate how efficiently equity capital is used, but unusually high or negative values may reflect leverage, losses, or a small equity base.
Calculation and source
How return on equity is calculated
TickerStat calculates ROE as SEC-reported net income divided by average stockholders’ equity at the beginning and end of the fiscal period. Periods with missing or non-positive average equity are omitted. Quarterly ROE uses quarterly net income and is not annualized. Fiscal periods can differ from calendar years, so exact period-end dates are included.
Review Prothena Corp Public source filings ↗