Nvidia, Apple, and Microsoft Spell Trouble for Index Investors

Doug McIntyre and Lee Jackson recently broke down a historic and unsettling milestone for the stock market: just three companies—Nvidia, Apple, and Microsoft—now make up over 21% of the entire S&P 500.  The 24/7 Wall St. Analysts examined how this unprecedented concentration compares to past historical peaks (like IBM, AT&T, and ExxonMobil in the 1980s) and why thin market breadth leaves everyday index fund investors far less diversified than they realize.