Illumina is trading at $256.50, down 5.36% after hours, with no verified company-specific announcement explaining the decline.

  • Illumina’s news center lists recent releases from October 21 and earlier.
  • The next scheduled catalyst is third-quarter results after the market close on October 29.
  • Major indexes were higher, so the supplied market context does not explain the opposite-direction move; after-hours volume was unavailable.