Data: U.S. stock market concentration hits record high, top 10% of stocks account for 78% of total market value

BlockBeats News, on September 27, trading information platform Kobeissi Letter released data: Currently, the top 10% of U.S. stocks by market capitalization account for 78% of the total U.S. stock market value, setting a new historical high. This proportion is 3 percentage points higher than the record high in the 1930s, and also exceeds the peak during the internet bubble in 2000, when the ratio was 74%.

In contrast, in the 1980s, the total weight of the top 10% of companies by market capitalization was less than 50%. Meanwhile, the percentage of the top 10 stocks in the S&P 500 Index by market capitalization has reached a record 41%, indicating the market has never been so concentrated.