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Mr. Lyons joined the Company in 2001 as Controller of Ameren and certain of its subsidiaries. Mr. Lyons was elected Vice President of the Company and certain of its subsidiaries in 2003. In 2007, he was elected Vice President and Principal Accounting Officer, and in 2008, he was elected Senior Vice President and Principal Accounting Officer of Ameren and its subsidiaries. In 2009, Mr. Lyons was elected Senior Vice President and Chief Financial Officer, while remaining as the Principal Accounting Officer, of the Company and its subsidiaries. In 2013, Mr. Lyons was elected Executive Vice President and Chief Financial Officer of the Company and its subsidiaries and relinquished his duties as Chief Accounting Officer. In 2016, Mr. Lyons was also elected Chairman and President of Ameren Services. In December 2019, Mr. Lyons was elected Chairman and President of Ameren Missouri. In January 2022, Mr. Lyons was elected President and Chief Executive Officer of the Company, and in November 2023, he was elected Chairman, President and Chief Executive Officer of the Company.

Mr. Michael L. Moehn, Senior Executive Vice President and Chief Financial Officer. Mr. Moehn has served as the Company's Chief Financial Officer since 2019 and previously served as Chairman and President of Ameren Missouri from 2014 to 2019. Effective October 2, 2025, Michael L. Moehn, who currently serves as the Company's Senior Executive Vice President and Chief Financial Officer, has been elected to the additional position of Interim Chairman and President of Ameren Missouri. On October 14, 2025, Ameren Corporation announced that Michael L. Moehn, Senior Executive Vice President and Chief Financial Officer of the Company, has been elected to the position of Group President, Ameren Utilities, of the Company, effective January 1, 2026.

Leonard P. Singh served as Senior Vice President of Consolidated Edison Company of New York from December 2020 to June 2022 and as Vice President, Manhattan Electric Operations of Consolidated Edison Company of New York from June 2015 to December 2020. effective January 1, 2026, Leonard P. Singh, Chairman and President of Ameren Illinois Company has been elected Executive Vice President and Chief Financial Officer of the Company.

Mr. Shawn E. Schukar joined a predecessor company of Ameren Illinois in 1984. In 2005, he was elected vice president, commercial RTO operations, of Ameren Services. In 2013, he was elected senior vice president, transmission operations, construction and project management, of ATXI. In May 2017, he was elected chairman and president of ATXI.

Mr. Mark C. Lindgren joined Ameren Services in 1998. In 2009, he was elected vice president, human resources, of Ameren Services, and in 2012, he was also elected chief human resources officer of Ameren Services. In September 2015, he was elected senior vice president, corporate communications, and chief human resources officer of Ameren Services.

Ms. Fitzsimmons served as Chief Legal Officer and Head of Public Affairs of Truist Financial Corporation from December 2019 through December 2023, having previously served as Corporate Executive Vice President, General Counsel and Corporate Secretary of its predecessor, SunTrust Banks, Inc., from 2018. From 2003 to November 2017, Ms. Fitzsimmons served as Senior and Executive Vice President of Law and Public Affairs, General Counsel and Corporate Secretary of CSX Corporation, a transportation supplier, which she joined in 1991. Ms. Fitzsimmons oversaw all legal, government relations and public affairs activities for CSX. During Ms. Fitzsimmons' tenure with SunTrust and CSX, her responsibilities included key roles in public affairs and corporate governance-related areas.

Mr. Flores joined Luminant, a private Texas-based electric utility, in 1983 and served as Senior Vice President and Chief Nuclear Officer from 2009 to 2015. In this position, he oversaw operations at the Comanche Peak Nuclear Power Plant in Texas, reported nuclear matters directly to Luminant's nuclear oversight advisory board and represented Luminant with the Nuclear Regulatory Commission, the Institute of Nuclear Power Operations, the Nuclear Energy Institute and on various committees and working groups in the nuclear industry.

Mr. Dickson served as Executive Vice President and Chief Financial Officer of WestRock Company from July 2015 to November 2021. Mr. Dickson previously served as Executive Vice President and Chief Financial Officer of RockTenn Company, the predecessor of WestRock Company, from September 2013 to July 2015, and in various positions at Cisco Systems from February 2006 to September 2013, most recently as Senior Vice President of Finance. Outside directorships: Avery Dennison Corp., 2024-Present.

Mr. Harshman served as Chairman, President and Chief Executive Officer of ATI Inc. (ATI), a producer of specialty materials and components to the global electrical energy, aerospace and defense, oil and gas, chemical process industry, medical, and other diversified consumer and durable goods markets, from May 2011 through December 2018 and as Executive Chairman from January 2019 through May 2019. Prior to becoming Chairman, President and CEO, Mr. Harshman served as ATI's President and Chief Operating Officer from August 2010 to May 2011, and Executive Vice President and Chief Financial Officer from December 2000 to August 2010. Outside directorships: PNC Financial Services Group, Inc., 2019-Present, ATI Inc., 2011-2019.

From November 2014 until her retirement in February 2019, Ms. Brinkley served in multiple senior leadership roles at Centene Corporation, a managed health care company, including chief administrative and markets officer from June 2018 to February 2019 and president and chief operating officer from November 2017 to June 2018. Prior to joining Centene, Ms. Brinkley served as vice president of global human resources at General Motors Company from 2011 to 2013. She also held various leadership roles at AT&T Inc., including senior vice president of talent development, chief diversity officer and president of AT&T Missouri. Outside directorships: Energizer Holdings, Inc., 2014-Present.

Mr. Lipstein served as President and Chief Executive Officer of BJC HealthCare, one of the largest non-profit healthcare organizations in the United States, from 1999 through 2016, and as Chief Executive Officer through December 2017. From 1982 to 1999, Mr. Lipstein held various executive positions within The University of Chicago Hospitals and Health System and The Johns Hopkins Hospital and Health System. Mr. Lipstein served as Chairman of the Federal Reserve Bank of St. Louis from 2009 to 2011.

Mr. Ivey served as President of Consolidated Edison Company of New York, Inc. (Con Edison) from 2009 through 2017. Con Edison provides electric service to approximately 3.4 million customers and delivers gas to approximately 1.1 million customers in New York City and Westchester County; it also operates the largest steam distribution system in the United States for customers in New York City. He previously served in various positions at Dominion Resources, an electric utility company in Virginia, from 1985 to 2009, most recently as Senior Vice President for Transmission and Distribution.

Mr. Mackay has served as Senior Vice President, Ethics and Enterprise Assurance of Lockheed Martin Corporation, a global security and aerospace company, since August 2018, and also serves as the company's chief sustainability officer. He previously held multiple senior leadership positions at Lockheed Martin, including Senior Vice President, Internal Audit, Ethics and Sustainability from June 2016 to July 2018, and Vice President, Ethics and Sustainability from July 2011 to July 2016. Prior to joining Lockheed Martin, Mr. Mackay served as chief operations officer of ACS State Healthcare, LLC. He also held leadership roles at the United States Department of Veterans Affairs and Bell Helicopter Textron, Inc. Outside directorships: Cognizant Technology Solutions Corporation, October 2012-Present.

Mr. Vondran has served as President and Chief Executive Officer of American Tower Corporation, a global real estate investment trust and independent owner, operator and developer of multitenant communications real estate, since February 2024. He previously held multiple senior leadership positions at American Tower Corporation, including Executive Vice President and Global Chief Operating Officer from November 2023 to February 2024, Executive Vice President and President, US Tower Division from August 2018 to October 2023, Senior Vice President, General Counsel, US Tower Division from August 2010 to August 2018, and Senior Vice President, U.S. Leasing Operations from August 2004 to August 2010.

Ms. Engstrom has served as the Senior Vice President and Global Chief Information Officer of Caterpillar Inc., a leading manufacturer of construction and mining equipment, off-highway diesel and natural gas engines, industrial gas turbines and diesel-electric locomotives, since 2020. From 2018 to 2020, Ms. Engstrom served as Chief Information Officer of Caterpillar Financial Services Corporation, following numerous other leadership roles in information technology since joining Caterpillar in 1999.

Mr. Ajay K Arora, Senior Vice President and Chief Development Officer; Ameren Missouri.

Mr. Ryan J Martin, Senior Vice President, Finance, Ameren Services

Mr. Eric V Seidler, Senior Vice President, Operations Shared Services; Ameren Services

Mr. Patrick E Smith, Chairman and President, Ameren Illinois.

On August 13, 2021, the Board of Directors of Ameren Corporation elected Theresa A. Shaw as Senior Vice President, Finance and Chief Accounting Officer and the principal accounting officer of the Company, effective as of August 16, 2021. Ms. Shaw joined Ameren Services Company in 2002 as a supervisor of Investor Relations and Financial Communications and was promoted to Director of External Reporting in 2009. In 2013, Ms. Shaw relinquished her position at Ameren Services and was elected Assistant Vice President and Controller of the Company. In 2014, she was elected Vice President of Internal Audit of the Company.

David M. Feinberg served as Executive Vice President, General Counsel, and Secretary of American Electric Power Company, Inc. from January 2013 to August 2025.

Gwendolyn G. Mizell, Senior Vice President and Chief Sustainability, Diversity & Philanthropy Officer of Ameren Services since March 2023. Gwendolyn G. Mizell, Vice President, Chief Sustainability, Diversity, & Philanthropy Officer; Ameren Services- March 2022 - February 2023; Vice President, Innovation, and Chief Sustainability Officer; Ameren Services- January 2021 - March 2022; Vice President, Sustainability and Electrification; Ameren Services- June 2019 - January 2021; Senior Director, Corporate Social Responsibility; Ameren Services- March 2018 - June 2019; Director, Diversity, Equity and Inclusion; Ameren Services- October 2015 - March 2018.

On Feb. 9, 2026, Ameren Corporation announced that Timothy S. Rausch has been elected to the Ameren board of directors, effective March 1, 2026. Rausch served as executive vice president and chief nuclear officer of Tennessee Valley Authority (TVA) from October 2018 to July 2025. TVA is a federally owned electric utility corporation serving over 10 million people across the southeastern United States. He previously served as senior vice president and chief nuclear officer of both Talen Energy Corporation from June 2015 to September 2018 and PPL Corporation from June 2009 to June 2015. Earlier in his career, he also held various leadership positions in nuclear generation at Exelon Nuclear Corporation and FirstEnergy Corporation. Rausch earned a Master of Business Administration from Cleveland State University and a Bachelor of Science in nuclear engineering from the University of Cincinnati.