How much of S&P 500 returns come from AI stocks?
Core argument: 42 AI-related stocks have accounted for 75%–85% of S&P returns, earnings and capital spending since GPT launched in fall 2022, rising to 80%–100% of those same variables when measured from fall 2024.
42 AI-related stocks have accounted for 75%-85% of S&P returns, earnings and capital spending since GPT was launched in the fall of 2022. If we push this date forward to the fall of 2024 to capture the more intense phase of AI investing and adoption, these 42 AI-related stocks have accounted for 80%-100% of the same variables. Tech P/E multiples have just experienced one of the largest corrections of the last decade. Another interesting vantage point: US tech stocks have the lowest ratio of P/E to earnings growth (the PEG ratio). This is mostly a reflection of low PEG ratios for semiconductor stocks given 62% expected earnings growth, compared to just 16% earnings growth expected for the software sector. In contrast to the dot-com era, the increase in tech sector capital spending has not been accompanied by increased debt financing in the aggregate.



