As of February 2026 Ameren has a market cap of NZ$50.89 Billion. This makes Ameren the world's 815th 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 Feb 22nd, 2026 the market cap of Ameren was reported to be: