The S&P 500 is not a 500 company index anymore. It is an AI index with 493 additional companies. Since the war started on February 27, the S&P 500 is up 7.34%. Remove AI stocks and the index is flat, up 0% over the same period. The entire 2026 rally belongs to a handful of companies. Friday showed exactly what that means on the downside. The S&P 500 fell 2.64%, its biggest single-day drop since October 2025. The S&P 500 without AI stocks moved 0.02%. The 493 companies that make up 60% of the index did nothing. The entire crash was AI stocks selling off. The top 10 stocks now make up 41% of the entire S&P 500, a level of concentration that has never existed before in the 145-year history of tracking market indexes. The previous record was 27% at the dot-com peak in 2000. At that peak in 2000, the S&P 500 fell 50% over the next two years while the Dow Jones, which had less tech concentration, fell only 37%. When you buy an S&P 500 index fund today, you are not buying 500 companies. You are placing a concentrated bet on AI, whether you know it or not. SOURCE: @biancoresearch
