Nasdaq drops 5.5% in one day as Democrats' midterm win rattles AI stocks

If you opened your investment app on Thursday and felt your stomach drop, you were not alone. Wall Street had a rough day, and the tech-heavy Nasdaq took the biggest hit.

What happened?

US stock markets closed sharply lower on Thursday, two days after the midterm elections (the US votes held halfway through a presidential term). The Nasdaq, which is packed with tech companies, fell 5.52%.

That wiped out more than $2.5 trillion in market value. It was the index's worst single day since April 2025.

The S&P 500 and the Dow Jones, the other two major US indices, also dropped. Tech giants weigh so heavily in both that they were dragged down too.

Why is everyone talking about it?

The timing is hard to ignore. On Tuesday 3 November, Democrats made major gains and beat Republicans in many states, a clear defeat for Donald Trump's camp.

Investors seem to fear what that means for artificial intelligence. Many data center projects, the huge buildings full of servers that AI needs to run, could now be called into question. New regulations on companies in the sector are also a possibility.

Other analysis of the day points the same way: the election results have deepened distrust of most stocks linked to AI and data centers. During Thursday's session, the Nasdaq was already down more than 5%.

Have we seen this before?

Yes, though not recently. The last time the Nasdaq fell this hard in a single day was in April 2025, after Trump unveiled his sweeping "Liberation Day" tariffs (taxes on imported goods). Markets plunged for days afterwards.

This time the trigger is political again, but the worry is different. It is less about trade and more about whether the AI boom can keep building at the same speed.

What's next?

It is too early to say whether Thursday was a one-day panic or the start of something longer. What investors will watch now is which data center projects are actually challenged, and what rules for the sector might follow.