#S&P 500

A large printed pie chart of index sector weights on a bright wall, one wedge caught being redrawn larger by a hand-free drafting tool, the new boundary line not yet complete

18% of the S&P 500 Is Now One Industry

Semiconductors have grown from 2% to 18% of S&P 500 weight — more than double the dot-com peak. A portfolio that never touches a chip stock by name is still more exposed to this one industry than most investors realize.

By Brecht Corbeel · August 10, 2026 · 4 min read

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