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Wall Street delivered a split verdict on the US midterm elections on Wednesday 4 November 2026: the broad market soared, while the stocks most tied to the artificial-intelligence building boom fell sharply. The divide tells you more about the next two years of US politics than the headline index moves alone.
Related reading: Democrats Flip the Senate to Take Full Control of Congress and Democrats Projected to Win Back the US House in 2026 Midterms.
The headline numbers
The Dow Jones Industrial Average jumped 1,569.40 points, or 3%, to close at 53,356.12. The S&P 500 gained 119.7 points, or 1.6%, to 7,688.62, and the Nasdaq Composite added 364.50 points, or 1.4%, to 25,736.51, according to Moneycontrol, reporting Reuters. All but two S&P 500 sector indexes rose, with consumer discretionary up 4.3% and energy down 4.8%.
Democrats seized control of both the Senate and the House of Representatives, scoring wins in Republican strongholds for the first time in generations in a voter backlash against President Donald Trump. Investors read that as easing political uncertainty: with divided government, the prospect of sweeping new legislation falls, and risk appetite rises.
Why AI stocks split in two
Within technology, the market drew a sharp line. Cash-rich AI heavyweights rose — Microsoft gained 6.7%, Amazon.com added 6.1%, Alphabet rose 3.2% and Meta Platforms added 1.4% — on expectations that a slower expansion of AI infrastructure would favour them competitively. Data centre operators and suppliers fell on the opposite fear: that tighter regulation and slower expansion would strain their finances.
As Business Recorder reported, Hut 8 fell about 23%, IREN lost about 11%, Core Scientific dropped about 10% and Applied Digital slid about 6.7%, while the Philadelphia Semiconductor Index fell to a six-month low. Democrats also made gains in key data-centre states including Texas and Georgia, where public opposition to the industry's rapid expansion — over power, water and local disruption — has been growing. That state-level politics may matter as much as anything Congress does.
What this does — and does not — mean
One day's trading is not a forecast. The Nasdaq-100 had already entered a technical correction on 2 November as investors worried about how much big technology companies are spending on AI and what returns that spending earns. Wednesday's rally does not resolve that question; it reframes it. If AI infrastructure growth slows, the companies that already have scale and cash win time; the companies that borrowed to build fast lose breathing room.
Investors also flagged the other side of divided government: legislative gridlock over the budget, the debt ceiling and congressional investigations. Relief over a smooth election outcome lifted stocks on Wednesday. Whether that relief lasts depends on whether Washington's new balance of power produces stability — or simply a different kind of fight.