Quick Answer
Altimmune, Inc. reported Shares Outstanding of 110.88 million shares for fiscal year 2025.
Altimmune, Inc. Shares Outstanding — Annual History
| Fiscal Year | Shares Outstanding | YoY Change |
|---|---|---|
| 2025 | 110.88M | +53.3% |
| 2024 | 72.35M | +2.4% |
| 2023 | 70.68M | +43.7% |
| 2022 | 49.20M | +20.0% |
| 2021 | 40.99M | +10.4% |
| 2020 | 37.14M | +142.6% |
| 2019 | 15.31M | +68.7% |
| 2018 | 9.08M | +1391.9% |
| 2017 | 608,499 | -91.2% |
| 2016 | 6.92M | -89.3% |
| 2015 | 64.38M | +1.2% |
| 2014 | 63.60M | +21.6% |
| 2013 | 52.30M | +8.2% |
| 2012 | 48.35M | +0.2% |
| 2011 | 48.24M | +4.3% |
| 2010 | 46.24M | — |
Quarterly Shares Outstanding
| Quarter Ending | Shares Outstanding | YoY | QoQ |
|---|---|---|---|
| September 30, 2025 | 95.60M | +34.4% | +12.4% |
| June 30, 2025 | 85.08M | +19.7% | +9.3% |
| March 31, 2025 | 77.83M | +9.8% | +7.6% |
| December 31, 2024 | 72.35M | +2.4% | +1.7% |
| September 30, 2024 | 71.12M | +34.6% | +0.1% |
| June 30, 2024 | 71.05M | +34.9% | +0.2% |
| March 31, 2024 | 70.90M | +43.9% | +0.3% |
| December 31, 2023 | 70.68M | +43.7% | +33.7% |
- Altimmune, Inc. showed an increase of +53.3% in Shares Outstanding compared to the prior fiscal year.
- Over the 2010–2025 period, Altimmune, Inc.’s shares outstanding has grown by 139.8% (from 46.24 million shares to 110.88 million shares).
- The most recent figure is from Altimmune, Inc.’s fiscal year 2025 report (Form 10-K), filed with the SEC on March 6, 2026.
- All figures are sourced from SEC EDGAR XBRL filings, last verified June 17, 2026.
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