• Aon average operating margin for 2023 was 29.78%, a 25.97% decline from 2022.
• Aon average operating margin for 2022 was 23.64%, a 11.61% increase from 2021.
• Aon average operating margin for 2021 was 21.18%, a 8.51% 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.