Gary L. Rainwater served as the Chairman, President, and CEO of Ameren Corporation, a major energy company, from 2004 to 2009. He had a long career starting as an engineer in 1979 at Union Electric, one of Ameren's subsidiaries. Over...

Gary L. Rainwater served as the Chairman, President, and CEO of Ameren Corporation, a major energy company, from 2004 to 2009. He had a long career starting as an engineer in 1979 at Union Electric, one of Ameren's subsidiaries. Over the years, Rainwater moved up the ranks, holding important positions within the company. His leadership was significant during the period when Ameren acquired Illinois Power, which expanded the company's reach. Under his guidance, Ameren focused on performance metrics like earnings per share, which directly influenced his compensation. Interestingly, in 2005, his total compensation reached about $1.86 million, reflecting a bonus based on strong company performance; however, this amount fluctuated in subsequent years. Rainwater actively managed stock holdings, reflecting his confidence in the company’s future. His insider trading activity from 2019 to 2024 shows significant investments, reaching up to $3.73 million in a single month, highlighting a consistent belief in the value of Ameren's shares. Rainwater stepped down as CEO in 2009 but continued to contribute to the company as Executive Chairman, showing a lasting commitment to Ameren's success.