Semiconductors Reach Record 19.7% of S&P 500 as Concentration Accelerates
Semiconductor companies account for 19.7% of the S&P 500, a record level nearly four times their weighting in June 2020. Nvidia is the primary driver, but a widening roster of chip suppliers and memory stocks has amplified the sector's footprint. That concentration is being fuelled by passive flows and rebalancing mechanics, even as multiple valuat…