The S&P 500 is increasingly a big bet on AI

Share of the market of S&P 500 capitalization; Quarterly; Q4 1995 to Q3 2026

(Please use a modern browser to see the interactive version of this visualization)

Note: The S&P 500 reorganized its Information Technology sector in September 2018, recategorizing giant tech companies like Amazon.com, Meta and Alphabet, which large participants in the AI boom.