As of November 2026 Alliant Energy has a market cap of โฌ17.20 Billion. This makes Alliant Energy the world's 1212th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Nov 11th, 2026 the market cap of Alliant Energy was reported to be: