Semiconductor Stocks Dominate Tech ETFs with Massive AI-Driven Growth

The technology sector has become the dominant force in the S&P 500, now accounting for 37.9% of the Vanguard S&P 500 ETF (VOO). This surge is driven by the artificial intelligence (AI) boom, which has shifted the focus from traditional software and consumer electronics to semiconductor and hardware companies. Six of the ten largest components in the Vanguard Information Technology ETF (VGT) are semiconductor stocks: Nvidia, Broadcom, Micron Technology, Advanced Micro Devices, Intel, and Lam Research. Together, they make up 32.4% of VGT, significantly higher than their 14.8% weighting in VOO.

Semiconductor stocks have seen remarkable growth, with Nvidia's market cap exceeding $5.5 trillion, Broadcom briefly hitting $2 trillion, and Micron and AMD both joining the $1 trillion club. Intel recently set a new all-time high, surpassing its previous peak from 2000. The combined market cap of these six semiconductor stocks has skyrocketed from less than $1 trillion at the end of 2022 to $10.5 trillion as of October 1, 2026.

Despite concerns about an AI bubble, valuations for many chip stocks remain reasonable. Nvidia, for example, trades at 24.8 times forward earnings, compared to 18.9 for the S&P 500. The demand for AI data center components, such as Nvidia's Vera Rubin NVL72 and AMD's Helios, continues to surge. Broadcom's custom AI accelerators and networking solutions are in high demand, with forecasts indicating that Anthropic could become Broadcom's largest customer by 2028.

The Vanguard Information Technology ETF offers a low-cost way to invest in leading AI stocks. With an expense ratio of just 0.09%, it provides exposure to a basket of semiconductor stocks, making it a compelling option for investors who believe in the sustained growth of AI infrastructure.