San Diego, September 20, 2026, 09:19 (PDT) Illumina closed Friday at $239.62, down 2.27%. Volume reached 32.59 million shares, 8.86 times Thursday's turnover. S&P 500 membership becomes effective before Monday's opening bell. Illumina, Inc. (NASDAQ:ILMN) shares fell 2.3% to $239.62 on Friday, despite exceptionally heavy turnover. The stock joins the S&P 500 before Monday's open.…
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