Nasdaq Falls 5.52% as Midterm Sweep Triggers AI Regulation Selloff

By Elena Vasquez

The Nasdaq Composite dropped 5.52% on Thursday — its worst session since April 2025 — as investors priced in the possibility of new AI regulation following Democrats' midterm election sweep.

The Dow Jones Industrial Average fell 1,833 points, or 3.44%. The S&P 500 declined 4.36%. The Nasdaq closed more than 10% below its October record high, entering correction territory in a single session.

President Donald Trump blamed the losses directly on the election results. In a post on Truth Social, he wrote: "The Stock Market suffered one of the Worst Days in History based on the results of the Election."

Why did AI stocks take the hardest hit?

The sell-off concentrated in technology and artificial intelligence names, according to FOX Business reporting, as investors weighed what Democratic control of Congress could mean for AI regulation and data center development.

The numbers were brutal at the chip level. Nvidia fell more than 9%. The Philadelphia Semiconductor Index plunged more than 12%.

For an industry that has bet enormous sums on unconstrained buildout, that is the heart of the story. Data center expansion — the physical backbone of the AI boom — now faces a political environment where Democrats, having won control of both the House and Senate, could push oversight measures that Republicans had resisted.

What did Trump actually say?

The president did not hold back on Truth Social. Beyond blaming the election, he warned ordinary investors about their retirement accounts.

"Such a sad thing to watch! It took so much work to get us to a level that no one has ever seen before, and then this," Trump wrote. "Your 401(k)s have, therefore, dropped."

He then turned his fire on the opposition party by name — or at least by his own name for it. "Remember, it wasn't Republicans, it was Dumocrats," he wrote. "Do not fear, however, we will soon, one way or the other, be BIGGER AND STRONGER THAN EVER BEFORE."

Trump's framing places the entire loss at the feet of the Democratic midterm victories, which included winning control of both chambers of Congress. The market data at least partially supports the timing: the plunge came just one day after stocks rallied following the midterm elections, wiping out the previous session's gains entirely.

How do markets read the election?

Analysts drew a straight line from the ballot box to the trading floor.

"The obvious catalyst for the sharp selloff is that markets are pricing in the midterm results," eToro market analyst Jakub Rochlitz said.

That pricing-in matters for the AI sector specifically. The midterm results have reshaped the political landscape for artificial intelligence, as FOX Business reported in a companion piece on how Democratic gains could alter the policy environment for the technology. Regulation and data center development were the two flashpoints investors flagged.

The sequence tells the story in three acts:

• Tuesday/Wednesday: Midterm elections deliver Democrats control of the House and Senate; stocks rally.
• Thursday: Wall Street suffers its sharpest losses since April 2025, with tech and AI shares leading the decline.
• Result: The Nasdaq enters correction territory, closing more than 10% below its October record high.

Is regulation the only worry?

No — and this is where the story gets more interesting for anyone tracking the AI buildout.

Beyond the election results, investors have also raised concerns about the enormous borrowing and spending fueling the AI boom, FOX Business reported. Technology companies are expanding data centers amid rising energy costs and uncertainty over future returns.

That is a second, quieter fear sitting underneath Thursday's headlines. The AI infrastructure race has depended on capital markets staying confident that the spending will eventually pay off. Rising energy costs squeeze the economics of data centers. Uncertainty over returns squeezes the willingness to keep funding them. A hostile regulatory environment would add a third squeeze.

Thursday suggested investors can imagine all three pressures arriving at once.

Why does one bad trading day matter for AI policy?

Markets move on expectations, and Thursday's move embedded a clear expectation: Democratic control of Congress raises the probability of AI regulation that could slow data center development and constrain the industry's growth trajectory.

The magnitude makes the point. A 12% single-day drop in the Philadelphia Semiconductor Index is not noise. Nvidia shedding more than 9% in a session reflects real repricing of risk, not routine volatility.

For the AI industry, the political calculus has shifted. Companies planning data center expansions now face congressional committees chaired by Democrats, and investors will watch every signal on regulatory intent. Trump's promise that the market will be "BIGGER AND STRONGER THAN EVER BEFORE" is a political statement, not a market forecast — but it signals that the White House intends to fight the direction Congress may take.

The coming months will test whether Thursday was an overreaction to a political headline or the first repricing of an AI boom that now has to survive divided government, skeptical lenders, and expensive electricity all at the same time.

FOX Business' Sophia Compton and Eric Revell contributed reporting to the original story.