Micron Technology Inc. (MU) will join the S&P 100 index following a quarterly rebalancing announced on March 6, 2026. The index will also add AI-focused firms Lam Research and Applied Materials. These inclusions highlight the growing influence of the AI infrastructure sector on the broader market.
Inclusion in the S&P 100 establishes Micron as one of the most significant companies in the U.S. equity market. The move will generate automatic, price-insensitive demand for MU shares from index-tracking funds. The iShares S&P 100 ETF (OEF) is among the primary vehicles expected to increase its holdings.
The announcement followed a 6.7% decline in Micron's stock price during a semiconductor sector selloff on March 6. Analysts maintain a positive outlook on the company's fundamentals despite the recent volatility. Surging demand for high-bandwidth memory (HBM) chips remains a critical driver for AI data center infrastructure.