Prothena Corp Public annual shares outstanding
2012
2013
2014
2015
2016
2017
2018
2019
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2021
2022
2023
2024
2025
Prothena Corp Public Shares Outstanding History (PRTA)
Prothena Corp Public reported 53.8M shares outstanding at the end of fiscal 2025.
View full Prothena Corp Public company overviewProthena Corp Public annual shares outstanding history
| Fiscal year | Period ended | Shares outstanding | Change | Growth |
|---|---|---|---|---|
| 2025 | 2025-12-31 | 53.8M | 6,000 | +0.01% |
| 2024 | 2024-12-31 | 53.8M | 144,865 | +0.27% |
| 2023 | 2023-12-31 | 53.7M | 1.6M | +3.03% |
| 2022 | 2022-12-31 | 52.1M | 5.4M | +11.67% |
| 2021 | 2021-12-31 | 46.7M | 6.7M | +16.88% |
| 2020 | 2020-12-31 | 39.9M | 22,852 | +0.06% |
| 2019 | 2019-12-31 | 39.9M | 34,850 | +0.09% |
| 2018 | 2018-12-31 | 39.9M | 1.4M | +3.59% |
| 2017 | 2017-12-31 | 38.5M | 3.7M | +10.74% |
| 2016 | 2016-12-31 | 34.8M | 3.0M | +9.48% |
| 2015 | 2015-12-31 | 31.7M | 4.4M | +15.91% |
| 2014 | 2014-12-31 | 27.4M | 5.5M | +25.31% |
| 2013 | 2013-12-31 | 21.9M | 4.2M | +23.63% |
| 2012 | 2012-12-31 | 17.7M | — | — |
Prothena Corp Public quarterly shares outstanding
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| Fiscal quarter | Period ended | Shares outstanding | Change | YoY change |
|---|---|---|---|---|
| Q2 2026 | 2026-06-30 | 51.7M | −2.1M | −3.87% |
| Q1 2026 | 2026-03-31 | 53.1M | −749,757 | −1.39% |
| Q4 2025 | 2025-12-31 | 53.8M | 6,000 | +0.01% |
| Q3 2025 | 2025-09-30 | 53.8M | 21,250 | +0.04% |
| Q2 2025 | 2025-06-30 | 53.8M | 55,137 | +0.10% |
| Q1 2025 | 2025-03-31 | 53.8M | 106,527 | +0.20% |
| Q4 2024 | 2024-12-31 | 53.8M | 144,865 | +0.27% |
| Q3 2024 | 2024-09-30 | 53.8M | 170,117 | +0.32% |
| Q2 2024 | 2024-06-30 | 53.8M | 278,378 | +0.52% |
| Q1 2024 | 2024-03-31 | 53.7M | 1.0M | +1.98% |
| Q4 2023 | 2023-12-31 | 53.7M | 1.6M | +3.03% |
| Q3 2023 | 2023-09-30 | 53.6M | 5.8M | +12.01% |
| Q2 2023 | 2023-06-30 | 53.5M | 6.7M | +14.28% |
| Q1 2023 | 2023-03-31 | 52.7M | 5.9M | +12.68% |
| Q4 2022 | 2022-12-31 | 52.1M | 5.4M | +11.67% |
| Q3 2022 | 2022-09-30 | 47.9M | 1.4M | +2.91% |
| Q2 2022 | 2022-06-30 | 46.8M | 1.9M | +4.22% |
| Q1 2022 | 2022-03-31 | 46.7M | 2.6M | +5.83% |
| Q4 2021 | 2021-12-31 | 46.7M | 6.7M | +16.88% |
| Q3 2021 | 2021-09-30 | 46.5M | 6.6M | +16.56% |
| Q2 2021 | 2021-06-30 | 44.9M | 5.0M | +12.53% |
| Q1 2021 | 2021-03-31 | 44.2M | 4.3M | +10.68% |
| Q4 2020 | 2020-12-31 | 39.9M | 22,852 | +0.06% |
| Q3 2020 | 2020-09-30 | 39.9M | 24,852 | +0.06% |
| Q2 2020 | 2020-06-30 | 39.9M | 14,852 | +0.04% |
| Q1 2020 | 2020-03-31 | 39.9M | 46,852 | +0.12% |
| Q4 2019 | 2019-12-31 | 39.9M | 34,850 | +0.09% |
| Q3 2019 | 2019-09-30 | 39.9M | 32,850 | +0.08% |
| Q2 2019 | 2019-06-30 | 39.9M | 64,725 | +0.16% |
| Q1 2019 | 2019-03-31 | 39.9M | 42,762 | +0.11% |
| Q4 2018 | 2018-12-31 | 39.9M | 1.4M | +3.59% |
| Q3 2018 | 2018-09-30 | 39.9M | 1.4M | +3.69% |
| Q2 2018 | 2018-06-30 | 39.8M | 1.7M | +4.39% |
| Q1 2018 | 2018-03-31 | 39.8M | 1.9M | +4.91% |
| Q4 2017 | 2017-12-31 | 38.5M | 3.7M | +10.74% |
| Q3 2017 | 2017-09-30 | 38.4M | 4.0M | +11.57% |
| Q2 2017 | 2017-06-30 | 38.2M | 3.8M | +10.98% |
| Q1 2017 | 2017-03-31 | 38.0M | 3.6M | +10.53% |
| Q4 2016 | 2016-12-31 | 34.8M | 3.0M | +9.48% |
| Q3 2016 | 2016-09-30 | 34.5M | 2.9M | +9.31% |
| Q2 2016 | 2016-06-30 | 34.4M | 3.0M | +9.57% |
| Q1 2016 | 2016-03-31 | 34.3M | 6.9M | +25.03% |
| Q4 2015 | 2015-12-31 | 31.7M | 4.4M | +15.91% |
| Q3 2015 | 2015-09-30 | 31.5M | 4.1M | +15.12% |
| Q2 2015 | 2015-06-30 | 31.4M | 4.7M | +17.69% |
| Q1 2015 | 2015-03-31 | 27.5M | 5.6M | +25.39% |
| Q4 2014 | 2014-12-31 | 27.4M | 5.5M | +25.31% |
| Q3 2014 | 2014-09-30 | 27.4M | 9.7M | +54.88% |
| Q2 2014 | 2014-06-30 | 26.7M | −17.65B | −99.85% |
| Q1 2014 | 2014-03-31 | 21.9M | 4.2M | +23.90% |
| Q4 2013 | 2013-12-31 | 21.9M | 4.2M | +23.63% |
| Q3 2013 | 2013-09-30 | 17.7M | — | — |
| Q2 2013 | 2013-06-30 | 17.68B | — | — |
| Q1 2013 | 2013-03-31 | 17.7M | — | — |
| Q4 2012 | 2012-12-31 | 17.7M | — | — |
Prothena Corp Public shares outstanding trends
Over the last five reported fiscal years, Prothena Corp Public's shares outstanding moved from 39.9M to 53.8M, a change of 13.9M. The latest reported quarter, Q2 2026, shows 51.7M.
About the metric
What shares outstanding means
Shares outstanding is the number of common shares held by investors at a reporting-period end. The count can change because of stock issuance, repurchases, conversions, acquisitions, or stock splits.
Calculation and source
SEC-reported period-end shares
TickerStat displays period-end common shares from SEC filings and adjusts older values to the current share basis when SEC-reported stock-split conversion ratios are available. Values remain as reported when no split ratio is available. Fiscal periods can differ from calendar years, so exact period-end dates are included.
Review Prothena Corp Public filings at SEC.gov ↗