AI Data Center Stocks Shed $4.2 Trillion in Market Value Since June

The scale of the drawdown matters more than any single name: the selloff has moved beyond AI chipmakers into the unglamorous suppliers — HVAC, fiber, motion control — that were repriced as derivative AI plays, and those halving first suggests the market is now discriminating between AI exposure and AI adjacency. The breadth, spanning manufacturing, utilities and mining, points to a repricing of the entire buildout thesis rather than a sector-specific wobble. Whether the capex pipeline that justified the prior 12-month run holds up is the open question, and suppliers with concentrated data-center exposure are where that gets tested first.