As of February 2026 Alliant Energy has a market cap of HK$132.36 Billion. This makes Alliant Energy the world's 1319th 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 Jan 31st, 2026 the market cap of Alliant Energy was reported to be: