• Ameren average operating margin for 2023 was 19.61%, a 0.41% increase from 2022.
• Ameren average operating margin for 2022 was 19.53%, a 10.94% increase from 2021.
• Ameren average operating margin for 2021 was 21.93%, a 0.05% decline from 2020.

Operating margin can be defined as operating margin measurement of what proportion of a company's revenue is left over after paying for variable costs of production such as wages, raw materials, etc.