Wall Street's favorite bet comes undone as chips whipsaw market

The Philadelphia Stock Exchange Semiconductor Index plunged 21% in July 2026, marking its worst month since October 2008 during the global financial crisis. The index tracks 30 of the world's largest semiconductor companies.

The Atomic take

A 21% single-month drop across the 30 largest chipmakers hits the exact companies whose GPUs and accelerators underpin every AI data center buildout, so this selloff questions whether the capital pouring into compute capacity was priced for perfection. The comparison to October 2008 matters because that month preceded a broad credit freeze, and semiconductors now sit at the center of hundreds of billions in planned data center and power infrastructure spending. Watch whether hyperscalers hold their capex guidance in the coming earnings calls, and whether the announced power deals tied to new fabs and AI campuses start slipping their timelines.

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