Megacap tech stocks aren't just powering the U.S. stock market — they're also holding the world together. U.S. equities now comprise 70% of the MSCI World Index, the benchmark for large- and mid-cap companies across 23 developed markets. The MSCI World Index shifts regional and country weights based on broader economic trends. High levels of market concentration in the late 1920s to early 1930s, as well as 2000, coincided with a market top, he noted. The Europe Stoxx 600 has risen only 2.6% year to date, underperforming the U.S. broad market index.

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Persons: Goldman Sachs, Scott Rubner, Peter Berezin, Berezin, NVDA, Phillip Colmar, that's, Mike Dickson, Dickson, Warren Buffett's, Colmar, It's, you've, Germany DAX Organizations: Apple, Microsoft, Nvidia, BCA Research, Big Tech, MRB Partners, Horizon Investments, Nikkei, British FTSE, France CAC Locations: U.S, Europe, Colmar, Japan, Asia, Germany, France