ALLIANT ENERGY CORP Common Stock Shares Outstanding

• ALLIANT ENERGY CORP showed an increase of +0.2% in Common Stock Shares Outstanding from 2024 to 2025.
• This data is from ALLIANT ENERGY CORP's annual report (Form 10-K), filed with the SEC on February 20, 2026.
• XBRL data for this metric is available from 2012 to 2025 (14 years of filings). Earlier data may not exist in machine-readable XBRL format as companies adopted electronic filing at different times.
• Quarterly values from 10-Q filings: Q2 2010: 110.80 million shares | Q3 2010: 110.86 million shares | Q1 2011: 110.94 million shares | Q2 2011: 110.98 million shares | Q3 2011: 110.98 million shares | Q1 2012: 110.96 million shares | Q2 2012: 110.98 million shares | Q3 2012: 110.99 million shares | Q1 2013: 110.92 million shares | Q2 2013: 110.94 million shares | Q3 2013: 110.94 million shares | Q1 2014: 110.94 million shares | Q2 2014: 110.94 million shares | Q3 2014: 110.94 million shares | Q1 2015: 112.98 million shares | Q2 2015: 113.26 million shares | Q3 2015: 113.36 million shares | Q1 2016: 113.56 million shares | Q2 2016: 227.33 million shares | Q3 2016: 227.50 million shares | Q1 2017: 227.82 million shares | Q2 2017: 231.06 million shares | Q3 2017: 231.20 million shares | Q1 2018: 231.48 million shares | Q2 2018: 233.77 million shares | Q3 2018: 235.94 million shares | Q1 2019: 237.39 million shares | Q2 2019: 237.52 million shares | Q3 2019: 240.34 million shares | Q1 2020: 249.50 million shares | Q2 2020: 249.64 million shares | Q3 2020: 249.76 million shares | Q1 2021: 250.13 million shares | Q2 2021: 250.26 million shares | Q3 2021: 250.36 million shares | Q1 2022: 250.81 million shares | Q2 2022: 250.93 million shares | Q3 2022: 251.02 million shares | Q1 2023: 251.39 million shares | Q2 2023: 252.72 million shares | Q3 2023: 255.18 million shares | Q1 2024: 256.38 million shares | Q2 2024: 256.50 million shares | Q3 2024: 256.60 million shares | Q1 2025: 256.88 million shares | Q2 2025: 256.97 million shares | Q3 2025: 257.05 million shares.
• Over the full 14 years of available data (2012 to 2025), ALLIANT ENERGY CORP's Common Stock Shares Outstanding has grown by 131.7%.
• Historical annual values: Fiscal year 2025: 257.14 million shares | Fiscal year 2024: 256.69 million shares | Fiscal year 2023: 256.10 million shares | Fiscal year 2022: 251.13 million shares | Fiscal year 2021: 250.47 million shares | Fiscal year 2020: 249.87 million shares | Fiscal year 2019: 245.02 million shares | Fiscal year 2018: 236.06 million shares | Fiscal year 2017: 231.35 million shares | Fiscal year 2016: 227.67 million shares | Fiscal year 2015: 226.92 million shares | Fiscal year 2014: 221.87 million shares | Fiscal year 2013: 221.89 million shares | Fiscal year 2012: 110.99 million shares.
• Data sourced from SEC EDGAR public filings as of August 10, 2026.

Last verified: August 10, 2026