Illumina is trading 4.6% higher at $267.02, with the move most plausibly reflecting continued index-related buying after its S&P 500 inclusion.
- Illumina was reported to join the index during the September 2026 rebalancing; recent bullish analyst sentiment may also be contributing.
- Shares closed at $255.38 on September 23, 2026, after gaining 3.20%.
- Major U.S. indexes were lower. No company-specific announcement, filing, or earnings release was identified for September 24, 2026.