• Marsh & McLennan average operating margin for 2023 was 22.07%, a 2.27% increase from 2022.
• Marsh & McLennan average operating margin for 2022 was 21.58%, a 6.36% increase from 2021.
• Marsh & McLennan average operating margin for 2021 was 20.29%, a 16.21% increase 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.