Wall Street faces fresh risks as AI rout meets oil shock

A semiconductor slide and $110 Brent crude combined to erase over $1 trillion in tech market value in a single week Wall Street spent much of the year betting that artificial intelligence would carry the market. This week, that bet ran into a wall, and the wall had an oil barrel stamped on it. A sharp selloff in AI-related stocks collided with a spike in crude prices in mid-October 2026. The result was more than $1 trillion in tech market capitalization wiped out within a single week. Rising oil fed inflation fears, inflation fears fed rate expectations, and rate expectations hit the most capital-hungry corner of the market hardest. The Nasdaq 100 posted its worst weekly performance since April 2025, falling 5.5% . Chipmakers took the heaviest damage.

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