Defendant
1 case as defendant.
Ameren Corporation, commonly known as Ameren, is a public utility holding company headquartered in St. Louis, Missouri. It was founded on December 31, 1997, through the merger of Union Electric Company and Central Illinois Public Service Company (CIPSCO Inc.). Ameren is traded on the New York Stock Exchange under the ticker symbol AEE and is a component of the S&P 500. The company employs approximately 8,900 to 9,244 individuals. As of late 2025, Ameren reported total assets of approximately $48.5 billion and revenue of around $8.80 billion.
Ameren operates rate-regulated electric generation, transmission, and distribution businesses, as well as natural gas transmission and distribution businesses. Through its subsidiaries, Ameren Illinois and Ameren Missouri, the company provides electric and natural gas services to approximately 2.5 million electric customers and over 900,000 natural gas customers across 64,000 to 67,700 square miles in central and eastern Missouri and central and southern Illinois. Ameren's generating capacity is approximately 9,300 megawatts of electricity.
Based on the provided case data, Ameren Corporation appears to be an operating company that defends against patent infringement suits. The company has been involved in one tracked case as a defendant and zero as a plaintiff. This posture indicates that Ameren is not primarily engaged in asserting intellectual property rights but rather in defending its operations from accusations of infringement.
The sole tracked patent litigation case involving Ameren Corporation is Midwest Energy Emissions Corp. v. Ameren Corporation, where Ameren is listed as a defendant. This case was filed in 2024 in the U.S. District Court for the Eastern District of Missouri.
A patent infringement suit by Midwest Energy Emissions Corp. against Ameren Corporation, filed in the Eastern District of Missouri and later consolidated into an MDL.