Quick Answer
PROTHENA CORP PUBLIC LTD CO reported Shares Outstanding of 53.83 million shares for fiscal year 2025.
PROTHENA CORP PUBLIC LTD CO Shares Outstanding — Annual History
| Fiscal Year | Shares Outstanding | YoY Change |
|---|---|---|
| 2025 | 53.83M | +0.0% |
| 2024 | 53.83M | +0.3% |
| 2023 | 53.68M | +3.0% |
| 2022 | 52.10M | +11.7% |
| 2021 | 46.66M | +16.9% |
| 2020 | 39.92M | +0.1% |
| 2019 | 39.90M | +0.1% |
| 2018 | 39.86M | +3.6% |
| 2017 | 38.48M | +10.7% |
| 2016 | 34.75M | +9.5% |
| 2015 | 31.74M | +15.9% |
| 2014 | 27.39M | +25.3% |
| 2013 | 21.86M | +23.6% |
| 2012 | 17.68M | — |
Quarterly Shares Outstanding
| Quarter Ending | Shares Outstanding | YoY | QoQ |
|---|---|---|---|
| September 30, 2025 | 53.83M | +0.0% | +0.0% |
| June 30, 2025 | 53.83M | +0.1% | +0.0% |
| March 31, 2025 | 53.83M | +0.2% | +0.0% |
| December 31, 2024 | 53.83M | +0.3% | +0.0% |
| September 30, 2024 | 53.81M | +0.3% | +0.1% |
| June 30, 2024 | 53.77M | +0.5% | +0.1% |
| March 31, 2024 | 53.72M | +2.0% | +0.1% |
| December 31, 2023 | 53.68M | +3.0% | +0.1% |
- PROTHENA CORP PUBLIC LTD CO showed an increase of +0.0% in Shares Outstanding compared to the prior fiscal year.
- Over the 2012–2025 period, PROTHENA CORP PUBLIC LTD CO’s shares outstanding has grown by 204.5% (from 17.68 million shares to 53.83 million shares).
- The most recent figure is from PROTHENA CORP PUBLIC LTD CO’s fiscal year 2025 report (Form 10-K), filed with the SEC on February 27, 2026.
- All figures are sourced from SEC EDGAR XBRL filings, last verified June 17, 2026.
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