Prothena Corp Public annual book value per share
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Prothena Corp Public Book Value Per Share Growth & History (PRTA)
Prothena Corp Public's book value per share was $5.21 for fiscal 2025.
View full Prothena Corp Public company overviewProthena Corp Public annual book value per share history
| Fiscal year | Period ended | Book value per share | Change | Growth |
|---|---|---|---|---|
| 2025 | 2025-12-31 | $5.21 | -$3.84 | −42.41% |
| 2024 | 2024-12-31 | $9.05 | -$1.41 | −13.49% |
| 2023 | 2023-12-31 | $10.46 | -$1.48 | −12.41% |
| 2022 | 2022-12-31 | $11.94 | $1.95 | +19.53% |
| 2021 | 2021-12-31 | $9.99 | $5.38 | +116.70% |
| 2020 | 2020-12-31 | $4.61 | -$2.23 | −32.62% |
| 2019 | 2019-12-31 | $6.84 | -$1.26 | −15.58% |
| 2018 | 2018-12-31 | $8.10 | -$2.48 | −23.42% |
| 2017 | 2017-12-31 | $10.58 | $0.07 | +0.63% |
| 2016 | 2016-12-31 | $10.51 | -$0.85 | −7.46% |
| 2015 | 2015-12-31 | $11.36 | $0.78 | +7.34% |
| 2014 | 2014-12-31 | $10.58 | $2.66 | +33.51% |
| 2013 | 2013-12-31 | $7.93 | $0.77 | +10.81% |
| 2012 | 2012-12-31 | $7.15 | $7.60 | — |
| 2011 | 2011-12-31 | -$0.44 | — | — |
Prothena Corp Public quarterly book value per share
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| Fiscal quarter | Period ended | Book value per share | Change | YoY change |
|---|---|---|---|---|
| Q2 2026 | 2026-06-30 | $5.54 | -$0.48 | −7.98% |
| Q1 2026 | 2026-03-31 | $5.89 | -$2.24 | −27.57% |
| Q4 2025 | 2025-12-31 | $5.21 | -$3.84 | −42.41% |
| Q3 2025 | 2025-09-30 | $5.48 | -$4.45 | −44.82% |
| Q2 2025 | 2025-06-30 | $6.03 | -$4.80 | −44.32% |
| Q1 2025 | 2025-03-31 | $8.13 | -$1.22 | −13.05% |
| Q4 2024 | 2024-12-31 | $9.05 | -$1.41 | −13.49% |
| Q3 2024 | 2024-09-30 | $9.93 | -$1.58 | −13.70% |
| Q2 2024 | 2024-06-30 | $10.82 | -$0.05 | −0.48% |
| Q1 2024 | 2024-03-31 | $9.35 | -$2.18 | −18.89% |
| Q4 2023 | 2023-12-31 | $10.46 | -$1.48 | −12.41% |
| Q3 2023 | 2023-09-30 | $11.51 | $3.06 | +36.17% |
| Q2 2023 | 2023-06-30 | $10.87 | $2.17 | +24.97% |
| Q1 2023 | 2023-03-31 | $11.53 | $2.14 | +22.82% |
| Q4 2022 | 2022-12-31 | $11.94 | $1.95 | +19.53% |
| Q3 2022 | 2022-09-30 | $8.45 | -$2.09 | −19.83% |
| Q2 2022 | 2022-06-30 | $8.70 | $2.28 | +35.60% |
| Q1 2022 | 2022-03-31 | $9.39 | $4.08 | +76.79% |
| Q4 2021 | 2021-12-31 | $9.99 | $5.38 | +116.70% |
| Q3 2021 | 2021-09-30 | $10.54 | $5.29 | +100.84% |
| Q2 2021 | 2021-06-30 | $6.42 | $0.54 | +9.24% |
| Q1 2021 | 2021-03-31 | $5.31 | -$1.08 | −16.90% |
| Q4 2020 | 2020-12-31 | $4.61 | -$2.23 | −32.62% |
| Q3 2020 | 2020-09-30 | $5.25 | -$2.00 | −27.59% |
| Q2 2020 | 2020-06-30 | $5.87 | -$1.72 | −22.61% |
| Q1 2020 | 2020-03-31 | $6.39 | -$1.44 | −18.39% |
| Q4 2019 | 2019-12-31 | $6.84 | -$1.26 | −15.58% |
| Q3 2019 | 2019-09-30 | $7.25 | -$1.27 | −14.93% |
| Q2 2019 | 2019-06-30 | $7.59 | -$1.35 | −15.08% |
| Q1 2019 | 2019-03-31 | $7.83 | -$2.45 | −23.86% |
| Q4 2018 | 2018-12-31 | $8.10 | -$2.48 | −23.42% |
| Q3 2018 | 2018-09-30 | $8.52 | -$3.09 | −26.60% |
| Q2 2018 | 2018-06-30 | $8.94 | -$3.82 | −29.97% |
| Q1 2018 | 2018-03-31 | $10.28 | -$2.79 | −21.34% |
| Q4 2017 | 2017-12-31 | $10.58 | $0.07 | +0.63% |
| Q3 2017 | 2017-09-30 | $11.61 | -$0.03 | −0.28% |
| Q2 2017 | 2017-06-30 | $12.76 | $0.23 | +1.84% |
| Q1 2017 | 2017-03-31 | $13.07 | -$0.49 | −3.61% |
| Q4 2016 | 2016-12-31 | $10.51 | -$0.85 | −7.46% |
| Q3 2016 | 2016-09-30 | $11.64 | -$0.35 | −2.91% |
| Q2 2016 | 2016-06-30 | $12.53 | -$0.06 | −0.50% |
| Q1 2016 | 2016-03-31 | $13.56 | $3.46 | +34.29% |
| Q4 2015 | 2015-12-31 | $11.36 | $0.78 | +7.34% |
| Q3 2015 | 2015-09-30 | $11.99 | $0.98 | +8.87% |
| Q2 2015 | 2015-06-30 | $12.59 | $1.40 | +12.53% |
| Q1 2015 | 2015-03-31 | $10.10 | $1.29 | +14.63% |
| Q4 2014 | 2014-12-31 | $10.58 | $2.66 | +33.51% |
| Q3 2014 | 2014-09-30 | $11.01 | $5.43 | +97.11% |
| Q2 2014 | 2014-06-30 | $11.19 | $5.13 | +84.53% |
| Q1 2014 | 2014-03-31 | $8.81 | $2.15 | +32.25% |
| Q4 2013 | 2013-12-31 | $7.93 | $0.77 | +10.81% |
| Q3 2013 | 2013-09-30 | $5.59 | — | — |
| Q2 2013 | 2013-06-30 | $6.07 | — | — |
| Q1 2013 | 2013-03-31 | $6.66 | — | — |
| Q4 2012 | 2012-12-31 | $7.15 | — | — |
Prothena Corp Public book value per share trends
Over the last five fiscal years, Prothena Corp Public's book value per share increased from $4.61 to $5.21, a change of $0.60. The latest reported quarter, Q2 2026, shows $5.54.
About the metric
What book value per share means
Book value per share estimates the common shareholders’ accounting equity represented by each share. It can help compare a company’s balance-sheet value over time, although market value can differ substantially from book value.
Calculation and source
How book value per share is calculated
TickerStat calculates book value per share as SEC-reported common shareholders’ equity divided by reported period-end common shares. Preferred equity is subtracted when separately reported, and basic weighted-average shares are used only when period-end shares are unavailable. Fiscal periods can differ from calendar years, so exact period-end dates are included.
Review Prothena Corp Public source filings ↗