Quick Answer
KAISER ALUMINUM CORP reported Shares Outstanding of 16.21 million shares for fiscal year 2025.
KAISER ALUMINUM CORP Shares Outstanding — Annual History
| Fiscal Year | Shares Outstanding | YoY Change |
|---|---|---|
| 2025 | 16.21M | +0.7% |
| 2024 | 16.10M | +0.5% |
| 2023 | 16.02M | +0.5% |
| 2022 | 15.94M | +0.5% |
| 2021 | 15.87M | +0.3% |
| 2020 | 15.81M | -0.4% |
| 2019 | 15.87M | -2.3% |
| 2018 | 16.23M | -3.2% |
| 2017 | 16.77M | -5.0% |
| 2016 | 17.65M | -2.2% |
| 2015 | 18.05M | +2.5% |
| 2014 | 17.61M | -3.0% |
| 2013 | 18.15M | -6.0% |
| 2012 | 19.31M | +0.3% |
| 2011 | 19.25M | +0.2% |
| 2010 | 19.21M | -5.2% |
| 2009 | 20.28M | — |
Quarterly Shares Outstanding
| Quarter Ending | Shares Outstanding | YoY | QoQ |
|---|---|---|---|
| September 30, 2025 | 16.21M | +0.7% | +0.2% |
| June 30, 2025 | 16.18M | +0.6% | +0.1% |
| March 31, 2025 | 16.15M | +0.6% | +0.4% |
| December 31, 2024 | 16.10M | +0.5% | +0.1% |
| September 30, 2024 | 16.09M | +0.5% | +0.0% |
| June 30, 2024 | 16.09M | +0.5% | +0.2% |
| March 31, 2024 | 16.06M | +0.5% | +0.3% |
| December 31, 2023 | 16.02M | +0.5% | +0.0% |
- KAISER ALUMINUM CORP showed an increase of +0.7% in Shares Outstanding compared to the prior fiscal year.
- Over the 2009–2025 period, KAISER ALUMINUM CORP’s shares outstanding has declined by 20.1% (from 20.28 million shares to 16.21 million shares).
- The most recent figure is from KAISER ALUMINUM CORP’s fiscal year 2025 report (Form 10-K), filed with the SEC on February 19, 2026.
- All figures are sourced from SEC EDGAR XBRL filings, last verified June 17, 2026.
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