• O'Reilly Automotive average operating margin for 2023 was 20.17%, a 3.95% decline from 2022.
• O'Reilly Automotive average operating margin for 2022 was 21%, a 3.71% decline from 2021.
• O'Reilly Automotive average operating margin for 2021 was 21.81%, a 8.94% 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.