As of December 2025 Ameren has a market cap of โน2.390 Trillion. This makes Ameren the world's 864th 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 9th, 2025 the market cap of Ameren was reported to be: