• Illumina average gross margin for 2023 was 61.96%, a 7.37% increase from 2022.
• Illumina average gross margin for 2022 was 66.89%, a 2.79% decline from 2021.
• Illumina average gross margin for 2021 was 68.81%, a 0.89% decline from 2020.

Gross margin can be defined as a company's total sales revenue minus its cost of goods sold, divided by the total sales revenue, expressed as a percentage.