The Nasdaq’s Worst Day In 19 Months: $2.5 Trillion Gone As Investors Price In Tougher Rules For AI Data Centers

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The Nasdaq Composite fell 5.52% on Thursday, November 5, its steepest one-day decline in 19 months, as investors weighed whether election results could complicate the expansion of US AI data centers. The Nasdaq-100 dropped 6.36%; Reuters estimated the fall erased about $2.5 trillion in market value across that index’s 100 largest non-financial companies.

Nasdaq’s published closing data put the Composite at 24,315.00, down 1,421.51 points. The Nasdaq-100 closed at 26,629.81, down 1,807.36 points. The Composite’s loss was its largest since April 4, 2025, when it fell 5.82% during a sharp market reaction to US tariff announcements. The market-value estimate refers to the Nasdaq-100, not every company listed on Nasdaq.

The selloff was concentrated in semiconductors and companies tied to data center construction. The PHLX Semiconductor index fell 12.25%. Reuters reported that Nvidia shares dropped 9% and AMD fell 17%, while several data center operators lost more than 14%. Amazon and Alphabet fell 2.2% and Microsoft declined 3.6%, according to the source material. The VIX, a measure of expected market volatility, recorded its biggest increase since December 2024, Reuters reported.

The Composite ended 11.9% below its October 6 record, putting it in correction territory, commonly defined as a decline of at least 10% from a recent peak. Thursday’s move followed a more mixed session: the index rose 1.44% on Wednesday, even as data center operators and power companies fell, Reuters reported. The source material describes Thursday as the fifth daily loss of more than 500 points since mid-October.

AI Infrastructure Faces Political Risk

The market reaction reflects concern that building the power-hungry facilities needed for AI could become slower or more expensive. Data center plans depend on permits, grid connections, electricity costs and tax incentives, decisions shaped by federal, state and local authorities. If those approvals become harder to secure, projects could be delayed and companies’ expectations for future capacity may change.

That does not establish that AI demand has weakened or that data center construction will stop. Rather, investors appear to be reassessing how quickly companies can turn heavy investment into operating facilities and returns. A sharp fall in chipmakers and infrastructure providers shows how political uncertainty can affect businesses that supply the build-out, as well as the technology companies financing it.

For workers, communities and electricity customers, the debate concerns where new facilities are built and who pays for the power and water they use. For investors and savers, the immediate lesson is that technology shares can respond not only to company results but also to uncertainty over infrastructure costs and approvals. Thursday’s decline alone does not settle the longer-term outlook for AI investment.

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Election Results and Data Center Plans

The selloff followed US midterm elections held two days earlier. The source material says Democrats won control of both chambers of Congress and gained several governorships. Reuters and The National described the results as a potential source of increased scrutiny of AI infrastructure. Congressional committees could hold hearings or investigations, while governors can influence state incentives and appoint utility regulators who oversee issues such as electricity rates and grid access.

The National reported that Democrats flipped five governorships, in Texas, Georgia, Ohio, Iowa and Nevada. Its analysis of Cleanview project data put 37% of planned US data center capacity in those states, including 22.8% in Texas. Those are figures attributed to that outlet’s analysis, not a count independently established here. The National also reported that incoming governors in Texas, Georgia and Ohio had promised pauses or other limits on large projects. The source material says local voters considered data center measures in ten states, with unofficial results showing 46 of 47 measures opposed to projects through bans, size limits or pauses.

Investors had already been debating the cost of AI infrastructure. On Wednesday, the Composite gained while some data center and power stocks weakened; Reuters reported that some traders viewed existing facilities as more valuable if fewer new ones were built. Thursday’s broader decline suggests that this interpretation did not prevent investors from selling technology stocks as political uncertainty came into focus. The source material also cites a UBS estimate that about 30% of planned 2028 capacity additions could be at risk. That is an analyst estimate, not a confirmed reduction in projects.

““deepest one-day drop since ‘Liberation Day’ in April 2025.””

— Reuters, describing the market decline

Policy Changes Remain Unsettled

The election results and index closes are reported facts, but the scale of any policy change is not yet clear. No new federal law restricting data center construction had passed, according to the source material. The incoming officeholders’ stated plans do not by themselves establish that projects will be halted, and the president retains veto power. Analysts cited in the source material expect political gridlock may limit sweeping federal changes.

It is also unclear how many projects would be affected by state or local actions, how quickly any pauses could take effect, or whether developers could relocate, redesign or reschedule facilities. The UBS capacity estimate is not a confirmed outcome, and the reported local ballot results were unofficial. The market decline cannot establish that political concerns alone caused every stock move; the available material identifies them as a key focus for investors, not the sole proven cause.

The $2.5 trillion figure is an estimate of market value erased from the Nasdaq-100, not money withdrawn from the market or a measure of losses for every investor. The source material does not establish how much of the decline may persist after Thursday or how companies will revise their construction plans.

Watch Approvals and Project Plans

Investors and local communities will be watching for concrete actions from the incoming Congress, governors, utility regulators and local governments. Hearings, proposed legislation, changes to tax incentives, permitting decisions and utility rulings could indicate whether campaign positions become policy. Formal decisions and project disclosures will provide firmer evidence than campaign statements or early market interpretations.

Companies’ updates on data center spending, construction schedules, power agreements and expected capacity will also help show whether the election has changed the build-out. The next market sessions may clarify whether Thursday was a short-lived repricing or part of a sustained reassessment, but one day’s trading cannot answer that. Any estimate of capacity at risk should be treated as a forecast until specific projects are delayed, reduced or cancelled.

Key Questions

How much did the Nasdaq fall on November 5?

The Nasdaq Composite fell 5.52%, closing at 24,315.00, while the Nasdaq-100 declined 6.36% to 26,629.81.

What does the $2.5 trillion figure refer to?

Reuters estimated that the Nasdaq-100 decline erased about $2.5 trillion in market value. The figure refers to that index’s 100 largest non-financial companies, not all Nasdaq-listed stocks.

Why did election results affect AI-related stocks?

Investors considered whether new lawmakers and governors could increase oversight or change approvals, incentives and utility decisions that affect data center construction. The market concern is not proof that projects will be stopped.

Have data center projects been cancelled?

The source material does not confirm broad project cancellations. It reports political pledges and an analyst estimate of possible capacity at risk, while no new federal restriction had been enacted.

Is the Nasdaq in a correction?

Yes. The Composite closed 11.9% below its October 6 record. A correction is commonly defined as a drop of at least 10% from a recent high.

Source: ThorstenMeyerAI.com