The US is not the only stock market where 10 stocks make up a lot of the index.
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https://www.marketwatch.com/story/10-stocks-are-driving-the-markets-gains-but-investors-shouldnt-be-concerned-923cc4f1?mod=home-page
A handful of Big Tech stocks are once again dominating the stock market. But that’s not necessarily a bad thing.
In fact, going back to the 1960s, the S&P 500 has tended to see stronger performance during periods where market concentration has been rising, according to a recent report from Michael Mauboussin, head of consilient research at Counterpoint Global, and Dan Callahan, vice president of Counterpoint.
DB2
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