Quick Answer
Amphastar Pharmaceuticals, Inc. reported Shares Outstanding of 45.65 million shares for fiscal year 2025.
Amphastar Pharmaceuticals, Inc. Shares Outstanding — Annual History
| Fiscal Year | Shares Outstanding | YoY Change |
|---|---|---|
| 2025 | 45.65M | -4.1% |
| 2024 | 47.62M | -0.9% |
| 2023 | 48.07M | -0.1% |
| 2022 | 48.11M | +0.8% |
| 2021 | 47.71M | +0.5% |
| 2020 | 47.50M | +2.0% |
| 2019 | 46.58M | -0.1% |
| 2018 | 46.63M | +0.0% |
| 2017 | 46.62M | +0.8% |
| 2016 | 46.25M | +2.3% |
| 2015 | 45.20M | +1.2% |
| 2014 | 44.65M | +15.2% |
| 2013 | 38.77M | — |
Quarterly Shares Outstanding
| Quarter Ending | Shares Outstanding | YoY | QoQ |
|---|---|---|---|
| September 30, 2025 | 46.35M | -4.2% | -0.3% |
| June 30, 2025 | 46.49M | -5.0% | -2.5% |
| March 31, 2025 | 47.67M | -2.4% | +0.1% |
| December 31, 2024 | 47.62M | -0.9% | -1.6% |
| September 30, 2024 | 48.37M | +1.0% | -1.2% |
| June 30, 2024 | 48.96M | +0.3% | +0.2% |
| March 31, 2024 | 48.84M | +1.4% | +1.6% |
| December 31, 2023 | 48.07M | -0.1% | +0.4% |
- Amphastar Pharmaceuticals, Inc. showed a decrease of -4.1% in Shares Outstanding compared to the prior fiscal year.
- Over the 2013–2025 period, Amphastar Pharmaceuticals, Inc.’s shares outstanding has grown by 17.7% (from 38.77 million shares to 45.65 million shares).
- The most recent figure is from Amphastar Pharmaceuticals, Inc.’s fiscal year 2025 report (Form 10-K), filed with the SEC on February 26, 2026.
- All figures are sourced from SEC EDGAR XBRL filings, last verified June 17, 2026.
Last verified: