U.S. stocks rallied on November 4, 2026, after Democrats won control of both chambers of Congress, with the Dow gaining 3%. On Thursday, stocks reversed sharply as investors sold shares tied to artificial intelligence and data center construction.
On Wednesday, November 4, 2026, the Dow Jones Industrial Average rose 3%, or more than 1,500 points. It was the index's best single-day performance since President Trump paused a sweeping tariff rollout in April 2025. The S&P 500 climbed 1.6% and the Nasdaq Composite traded up 1.4% that day in a post-election relief rally after Democrats won control of both chambers of Congress.
On Thursday, U.S. stocks reversed sharply as investors sold shares tied to artificial intelligence and data center construction. The selling gave back much of the previous session's post-election rally. Democratic victories in both chambers of Congress and in key state races raised questions about whether new data center projects could face greater scrutiny or local opposition. Those questions weighed on chipmakers and data center companies.
