Apple recently saw its market value grow to exceed a 4% weighting in the benchmark S&P 500.
Microsoft has already been a member of the "4% Club" for months. The last time two stocks were simultaneously above that threshold was in March 2000, when the dot-com crash first started.
Phil Segner, research analyst at the Leuthold Group, sees this occurrence portending an ominous future for tech stocks, particularly Apple.
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