Saint Louis, Missouri-based Ameren Corporation (AEE) generates and distributes electricity and natural gas to residential, commercial, industrial, and wholesale end markets in Missouri and Illinois. With a market cap of $26.7 billion, Ameren operates through Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission segments. Companies with a market cap of$10 billion or more are categorized as "large-cap stocks." Ameren fits this description perfectly, wi ...