SuperworthProthena Corp Public shares outstanding PRTA
Diluted shares outstanding, averaged over each quarter, from 2012.
- Latest quarter, to Jun 30, 2026
- 52.1M
- On a year earlier
- −3.1%
- fewer shares
Prothena Corp Public had 52.1M diluted shares outstanding on average in Q2 FY26, the quarter to Jun 30, 2026.
That is 3.1% fewer than a year earlier, so each share owns a little more of the company.
Shares outstanding over time
Fiscal year by fiscal year
| Fiscal year | Shares, fourth quarter | Change |
|---|---|---|
| FY2025 | 53.8M | +0% |
| FY2024 | 53.8M | +0% |
| FY2023 | 53.7M | +10% |
| FY2022 | 49M | +5% |
| FY2021 | 46.6M | +17% |
| FY2020 | 39.9M | +0% |
| FY2019 | 39.9M | +0% |
| FY2018 | 39.9M | +4% |
| FY2017 | 38.5M | +11% |
| FY2016 | 34.6M | +9% |
| FY2015 | 31.6M | +15% |
| FY2014 | 27.4M | +28% |
| FY2013 | 21.4M | +44% |
| FY2012 | 14.9M | n/a |
Each fiscal year is the twelve months to its fourth quarter, shown as the fourth quarter's average share count.
Quarter by quarter
| Quarter | Ended | Shares outstanding | On a year earlier |
|---|---|---|---|
| Q2 FY26 | 52.1M | −3% | |
| Q1 FY26 | 54.1M | +1% | |
| Q4 FY25 | 53.8M | +0% | |
| Q3 FY25 | 53.8M | +0% | |
| Q2 FY25 | 53.8M | −2% | |
| Q1 FY25 | 53.8M | +0% | |
| Q4 FY24 | 53.8M | +0% | |
| Q3 FY24 | 53.8M | −7% | |
| Q2 FY24 | 55M | +4% | |
| Q1 FY24 | 53.7M | +2% | |
| Q4 FY23 | 53.7M | +10% | |
| Q3 FY23 | 58M | +23% |
What the shares outstanding tells you
Diluted shares outstanding, averaged over the period. Fewer shares means each one owns more of the company.
A falling count usually means buybacks. A rising one means stock pay, acquisitions paid in shares or new shares sold.
More on Prothena Corp Public
Valuation data, not investment advice. Prices as of . Reported figures come from the company's filings with the SEC.