NEW YORK, Nov. 12, 2015 /PRNewswire/ -- Illumina Inc. (NASD:ILMN) will replace Sigma-Aldrich Corp. (NASD:SIAL) in the S&P 500 after the close of trading on Wednesday, November 18. Merck KGaA is acquiring Sigma-Aldrich in a deal expected to be completed on or about that date pending final conditions.

Illumina provides sequencing and array-based solutions for genetic analysis.  Headquartered in San Diego, CA, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Life Science Tools & Services Sub-Industry index.

Following is a summary of the change:

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