Microsoft Drops Oracle AI Cloud Deal as $3 Trillion Rout Hammers Tech Stocks After Democrat Midterm Sweep

A convergence of political and corporate shocks sent the AI trade into a sharp global convulsion this week, erasing roughly $3 trillion from US stocks on Thursday alone. The catalyst that crystallized months of unease was a Bloomberg report that Microsoft declined to renew its AI cloud deal with Oracle and has been switching off that capacity, raising immediate questions about the durability of data center spending commitments that have underpinned the entire AI boom. The Democrats' sweep in the US midterms compounded the pressure, with Bank of America warning that the political shift would slow AI data center buildout, even as it predicted AI stocks would eventually "come back in vogue."

The selloff was broad and severe across AI-linked hardware and infrastructure names. For the week, Marvell fell 28.9%, Western Digital dropped 28.0%, SanDisk lost 27.8%, Seagate fell 27.8%, Micron declined 21.9%, Dell shed 21.7%, and Arm Holdings slid 16.4%, with semiconductor equipment makers Lam Research and KLA also falling more than 12-15%. The rout then spread to Asian markets, amplifying the global reach of the correction.

Friday brought a partial recovery, with the Nasdaq posting a notable rebound and the S&P 500 closing up 0.31%, though breadth remained weak with 312 of 494 S&P heavyweights still in the red. The Nasdaq extended its weekly losing streak to four consecutive weeks. Strategist James Thorne attributed Thursday's plunge to excessive leverage and weak sentiment rather than a genuine collapse in AI demand, arguing that computing capacity could actually become scarcer over time. Bob Elliott of Unlimited characterized the move as the market beginning to price in the unsustainability of the AI trade as it had been structured. Higher interest rates were also cited as a factor that could force companies to rein in AI spending, adding another headwind for hyperscaler capital expenditure plans.