Chipmakers Lead $2.5tn Wall Street Retreat as Midterm Result Threatens AI Buildout

The Nasdaq Composite fell 5.52 per cent on Thursday, its steepest one-day drop since April 2025, after Democratic victories in the US midterms turned the politics of artificial intelligence into a market-wide repricing. The damage concentrated on the layer of the AI economy that depends on permits, power and water: chipmakers, data-centre operators and the debt-financed neoclouds that build capacity. For a sector whose valuations rest on continued construction, the result was the first test of what happens when the buildout meets an electoral mandate.

The mechanism was straightforward. Democrats won control of both chambers of Congress, and numerous incoming members, governors among them, had campaigned on slowing data-centre construction. Texas governor-elect Gina Hinojosa, in a state slated to host a third of new US data centres planned over the next two to three years, pledged a moratorium on new facilities. Residents of dozens of American cities backed restrictions or outright bans, and a Gallup poll published in May found 71 per cent of Americans would oppose a data centre in their community. Analysts at UBS estimated that around 30 per cent of US data-centre capacity additions expected in 2028 could be at risk from construction pauses.

By the close the numbers were broad. The S&P 500 lost about 4.4 per cent and the Dow Jones Industrial Average 3.44 per cent, or 1,833 points, to 51,523.06. Nvidia fell roughly 9 per cent, shedding some $400bn in market value; AMD and Micron each dropped more than 17 per cent; CoreWeave and Nebius, both reliant on borrowing, fell 10 and 15 per cent. Around $2.5tn was erased from Nasdaq-listed companies, with more than $3.2tn lost across the wider US market. In Asia the Kospi fell as much as 8.5 per cent before Seoul suspended trading, and Tokyo's Nikkei slid about 6 per cent. European bourses opened sharply lower, though Frankfurt, London and Milan closed with losses below 1.1 per cent and Paris ended marginally higher. Wall Street's VIX fear gauge jumped roughly 70 per cent.

Analysts separated political signal from technical amplification. Susannah Streeter of Wealth Club said fears that sums poured into AI infrastructure may not deliver expected returns were now colliding with the prospect of a sharp slowdown in data-centre construction. Ben Barringer of Quilter Cheviot cautioned it was "too easy to say that the Democrats will be bad for datacentres". Dan Kawa of We Capital argued forced deleveraging and margin calls amplified Thursday's move, while Anna Wu of Floodlines Research called it "largely a sentiment shock rather than a change in fundamentals", noting the president retains a veto. Ted Parkhill of Incline Investment Management said the market was moving "from the promise of AI to the price of AI".

Formal power does not change hands until the new Congress is seated in January 2027, leaving a gap between campaign pledges and legislation. The nearer test is corporate: results due next week from Cisco, CoreWeave, Applied Materials, Cerebras and Nebius, any of which could move a market still weighing infrastructure costs against returns.