
What happened
The Dow Jones Industrial Average dropped 3.4%, or more than 1,800 points, while the S&P 500 fell 4.4% and the Nasdaq Composite sank 5.5% into correction territory, with AI chip designers and memory makers hit hardest.
Why it matters
The sell-off erased the prior day's gains, when the Dow had jumped 3% for its best session of 2026 after Democrats won control of both chambers of Congress.
Summaries like this, every morning.
The sell-off came after a brief period when the Dow looked like the sheltered corner of the market. Earlier in the week, investors had rotated out of technology names and into consumer cyclical and financial services shares, leaving the Dow as the relative winner. That cushion gave way on Thursday as focus turned to what a Democratic Congress could mean for the AI buildout and the data centers driving it. The reversal was swift: the VIX volatility index posted its biggest one-day jump in more than two years, and the Nasdaq erased its entire post-election rally in just six minutes. Even Wednesday's winners, such as the iPhone maker, turned lower. A stronger-than-expected jobs report on Friday brought a partial rebound, with the Nasdaq gaining 1.9%, but the episode highlights how quickly sentiment can shift when political change threatens the infrastructure behind AI.
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