Analysis: Chip stocks' weight in the S&P 500 rises to a record 19.7%, sparking concentration concerns

According to market data, the weight of the semiconductor sector in the S&P 500 index has risen to a record 19.7%, nearly quadrupling from its 2020 level, primarily driven by the investment boom in artificial intelligence (AI). As AI infrastructure and computing power demand continue to expand, chip stocks have become one of the core driving forces behind the recent rally in U.S. equities, further concentrating the overall structure of the S&P 500 towards a few tech and semiconductor leaders. This has also intensified market concerns over excessive index concentration and elevated valuations. Nevertheless, continued inflows into related ETFs are still supporting sector performance. Market participants are closely watching whether AI capital expenditures can sustain their pace to justify current semiconductor valuation levels.