San Diego – October 10, 2025 – Cooley secured a dismissal without prejudice for Illumina, a global leader in genetic and genomic analysis, in a securities fraud class action arising from the company’s attempted acquisition of GRAIL. The lawsuit alleged that Illumina made material misstatements about the merger and the viability of GRAIL’s multicancer early-detection test, Galleri. Judge Linda Lopez of the US District Court for the Southern District of California granted Illumina’s motion to dismiss without prejudice, holding that the plaintiffs failed to adequately allege a causal connection between the alleged fraud and any stock price declines.

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Partners Koji Fukumura, Ryan Blair, Brian French and Heather Speers led the Cooley team representing Illumina.

The case is In re Illumina Inc. Securities Litigation before the US District Court for the Southern District of California (case number 3:23-cv-02082-LL-DTF).

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