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Illumina, Inc. (ILMN) has a market cap of $22.12B as of Friday, May 22, 2026. The ILMN market cap is up 10.77% over the past 30 days and has grown 73.80% over the past year. Market capitalization represents the total market value of a company's outstanding shares, calculated by multiplying the stock price by the total number of shares outstanding.