As of December 2025 Ameren has a market cap of โฌ22.40 Billion. This makes Ameren the world's 882th 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 Dec 11th, 2025 the market cap of Ameren was reported to be: