The semiconductor sector has reached a historic milestone, now representing a record 18.8% of the total market capitalization of the S&P 500. This concentration level marks a significant shift in index composition, as the industry's share of the benchmark has more than tripled since 2022.
During this same timeframe, the PHLX Semiconductor Index, commonly known as the SOX, experienced a substantial surge of 546%. This rapid expansion underscores the growing dominance of chipmakers within the broader equity market over the past two years.