Why a Democrat sweep wiped $2.5tn off Wall Street's AI trade

On Thursday, November 5, 2026, U.S. tech stocks plunged in a historic selloff, with the Nasdaq Composite falling 5.52% — its worst session since April 2025 — and closing in correction territory, more than 10% below its October 6 record high. The Dow Jones Industrial Average fell 1,833 points, or 3.44%.

The rout wiped roughly $2.5 trillion in market value, according to CNN and Gizmodo, while Yahoo Finance/DPA reported the Nasdaq 100 plunged 6.36% and lost $2.3 trillion. The Guardian reported more than $2 trillion shaved off the Nasdaq. The selloff came two days after Democrats scored resounding victories in congressional midterm elections, with investors fearing tighter AI regulation and opposition to data-center construction. The decline followed a post-midterm rally on Wednesday when the Dow soared 1,569 points.

South Korea's Kospi plunged almost 9% at Friday's open, triggering a 20-minute trading halt. Semiconductor stocks were particularly hard hit, and the 'Magnificent Seven' — Alphabet, Amazon, Apple, Meta, Microsoft, Nvidia, and Tesla — collectively lost around $1 trillion in value, per Gizmodo.

Wall Street's concerns extend beyond regulation. Investors are also worried about the massive debt obligations tech companies are issuing to build data centers, both because interest rates have been rising and because there is greater political uncertainty around how much opposition data-center construction will face.

The episode shows how quickly AI's market value is tied to the political and regulatory environment. If Democratic gains translate into heavier scrutiny of data centers, AI spending, and tech borrowing, the companies that drove the bull market could face a sustained repricing — with ripple effects on global markets, energy producers, chipmakers, and the broader economy.