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TL;DR
The Nasdaq Composite fell 5.52% on Nov. 5, its steepest one-day decline since April 2025, while semiconductor stocks dropped even more. The source material links the selloff to investor concerns that election results could bring tighter oversight and higher costs for AI data center projects, but major policy changes remain uncertain.
The Nasdaq Composite fell 5.52% on Nov. 5, closing at 24,315, as investors weighed whether US election results could make it harder or more expensive to build AI data centers. The Nasdaq-100 dropped 6.36%, and Reuters estimated that the fall erased about $2.5 trillion in market value from the 100-company index; the source material identifies policy uncertainty, not a new earnings shock, as a central concern.
Nasdaq’s published index data puts the Composite’s decline at 1,421.51 points, its largest one-day percentage drop since April 2025, when markets were hit by tariff-related turmoil. The Nasdaq-100 closed at 26,629.81, down 1,807.36 points. The $2.5 trillion estimate cited by Reuters applies to the Nasdaq-100, not every company listed on Nasdaq.
The steepest losses were in chipmakers and related infrastructure stocks. The PHLX Semiconductor index fell 12.25%; Reuters reported Nvidia lost 9% and AMD 17%, while several data center operators fell by more than 14%. The Composite ended 11.9% below its Oct. 6 record, meeting the usual definition of a market correction: a decline of at least 10% from a recent peak.
The source material says investors focused on potential changes to the rules and economics of data center construction after Democrats won control of Congress and several governorships. Concerns include more oversight, reduced tax incentives, developers bearing more power and water costs, and pauses on large projects. Those are risks investors are considering, not enacted nationwide policy changes.
Infographic 01 · The day in numbers
The Nasdaq's worst day in 19 months
Chips and data center builders led the fall. The dollar figure in the headlines belongs to the Nasdaq-100, the 100 largest non-financial companies on the exchange.
Nasdaq Composite on Thursday, 5 November 2026: down 1,421.51 points to 24,315.00. The biggest one-day fall since 4 April 2025, 19 months earlier.
The five worst Composite days since March 2025
Daily change, closing values
Sources: Nasdaq Global Indexes (COMP, NDX, SOX closing data, retrieved 6 Nov 2026) · Reuters, 5 Nov 2026 (via The Straits Times). History checked back to 25 Mar 2025. Market value is Reuters’ calculation. Not investment advice.
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Policy Risks Hit AI Infrastructure Stocks
The selloff shows that investors are pricing in not only demand for AI services, but also the practical conditions for building the computing capacity those services require. Data centers depend on permits, grid connections, electricity and water, as well as tax arrangements that can influence whether a project proceeds and how much it costs.
If regulators or local governments impose delays, limit incentives, or require developers to pay more for infrastructure, some projects could become less attractive or take longer to complete. That could affect data center operators and utilities, as well as chipmakers and cloud companies whose growth plans depend on new computing capacity. But a one-day share-price move does not establish that projects will be canceled or that AI demand has weakened.
For readers, the distinction is important: the market reaction reflects changing expectations and perceived risk. It is not proof that the predicted restrictions will take effect. The sharp fall also affected broad technology and semiconductor indexes, exposing investors to losses beyond companies that directly build data centers.
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Election Results and Project Exposure
The political concern follows a period of rising investor scrutiny of the cost of AI expansion. The source material says data center operators and power companies were already falling on Nov. 4, even as the Composite rose 1.44%. Amazon and Microsoft gained about 6% during that session, as some investors considered whether limits on new construction might benefit existing facilities. That interpretation gave way to a broader selloff the next day, when Amazon and Alphabet fell 2.2% and Microsoft 3.6%, according to the source material’s account of Reuters reporting.
The National reported that Democrats flipped five governorships—Texas, Georgia, Ohio, Iowa and Nevada—and that those states represent 37% of planned US data center capacity, based on its analysis of Cleanview project data. It said Texas accounts for 22.8%. The report also described incoming governors’ pledges to pause or restrict some projects. These figures and pledges are reported by The National and should not be read as a count of projects already stopped.
Local votes added to investor concern. The source material reports that unofficial results showed 46 of 47 local measures across ten states opposing data center development through measures such as bans, caps or pauses. Governors can influence the environment for projects through appointments to utility regulators and state tax policy, but the scope and timing of any resulting changes are not yet established.
No Nationwide Data Center Rules Yet
The source material says no new federal law has passed to impose the anticipated restrictions. It also notes that President Donald Trump retains veto power and that some analysts expect political gridlock rather than sweeping legislation. The balance between congressional oversight, federal authority and state or local decisions remains uncertain.
It is also unclear whether campaign pledges to pause projects will become formal policies, which projects would be affected, or how quickly any changes could reach permits, utility connections or tax incentives. The UBS estimate that about 30% of planned 2028 capacity additions could be at risk is a forecast, not a confirmed outcome. The source material does not establish that AI demand has fallen or that the selloff was caused by a single policy decision.
Watch Permits, Utility Rules and Policy
Investors and data center developers will be watching for concrete steps after the election: proposed bills, congressional hearings, state executive actions, changes to tax incentives, and decisions by utility regulators over power rates and grid access. Those developments would help show whether campaign pledges translate into rules that affect project costs or schedules.
Near-term market moves may also depend on company results and spending plans, alongside policy news. The Nov. 5 decline confirms a sharp repricing in technology shares, but it does not settle whether data center construction will slow. The next meaningful evidence will be specific government actions and project updates, rather than estimates of possible future restrictions.
Key Questions
How much did the Nasdaq fall on Nov. 5?
The Nasdaq Composite fell 5.52%, or 1,421.51 points, to 24,315. The Nasdaq-100 dropped 6.36% to 26,629.81.
What does the $2.5 trillion figure refer to?
Reuters estimated that about $2.5 trillion in market value was erased from the Nasdaq-100, which tracks 100 large non-financial companies. It is not an estimate for every Nasdaq-listed stock.
Did the election results immediately stop data center projects?
The source material reports election results, campaign pledges and local ballot measures, but does not establish that the results immediately stopped projects. It says no new federal law had passed to impose the anticipated restrictions.
Why are AI data centers relevant to the stock selloff?
Data centers require substantial computing equipment and infrastructure, including electricity, water, permits and grid connections. Investors were concerned that tighter oversight, higher costs or delays could affect planned construction and companies tied to the AI build-out.
Is the estimate that 30% of 2028 capacity is at risk confirmed?
No. The source material attributes that figure to a UBS estimate. It describes potential risk to planned capacity additions, not a confirmed loss or a government decision.
Source: ThorstenMeyerAI.com
