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The Nasdaq Composite fell 5.52% on Nov. 5, 2026, its largest one-day decline since April 2025; the Nasdaq-100 fell 6.36%. Investors weighed whether election results could lead to closer scrutiny of AI data center projects, but the potential policy changes remain uncertain and no new federal law has passed.
The Nasdaq Composite fell 5.52% on Thursday, Nov. 5, its steepest one-day decline since April 2025, as investors weighed whether U.S. midterm election results could change the rules and costs for building AI data centers. The selloff followed Democratic gains in Congress and several governor’s races, but the extent of any resulting policy changes is not yet known.
The Composite closed at 24,315.00, down 1,421.51 points, according to Nasdaq index data. The Nasdaq-100, which tracks 100 of the exchange’s largest non-financial companies, fell 6.36% to 26,629.81. Reuters estimated that the Nasdaq-100 decline erased about $2.5 trillion in market value; that figure refers to that index, not all stocks listed on Nasdaq.
Chipmakers and companies tied to data center construction recorded particularly sharp losses. The PHLX Semiconductor index dropped 12.25%. Reuters reported that Nvidia fell 9% and AMD fell 17%, while several data center operators lost more than 14%. Those individual stock declines and the market-value estimate are figures reported by Reuters; the index closing figures are from Nasdaq data.
The Composite’s fall exceeded its daily decline during the April 2025 tariff shock: the last larger one-day loss was 5.82% on April 4, 2025. The index closed 11.9% below its record on Oct. 6, meeting the usual threshold for a market correction. These figures describe the index’s movement; they do not establish that election policy concerns alone caused the decline.
Nasdaq’s worst day in 19 months AI data center rules add to investor worries
The Nasdaq fell sharply as investors weighed possible changes to AI data center costs and approvals. No new federal law has passed, and the eventual policy effects remain uncertain.
What moved the market
Investors considered how election results might affect the costs and approvals needed to build AI data centers.
Projects depend on more than chips
Data centers need electricity, water, land, permits and tax arrangements. Changes could mean higher costs or delays.
Losses spread across the sector
The semiconductor index fell 12.25%. Reuters reported Nvidia down 9% and AMD down 17%.
Possible policy pressure points
Analysts identified areas investors may watch as governments consider data center projects.
What is known—and unsettled
The selloff reflects investor expectations; it does not confirm changes to project economics.
- No new federal law has passed.
- The Nasdaq Composite closed 11.9% below its Oct. 6 record.
- The scope of oversight, incentive or cost changes.
- Whether any planned projects will be cancelled.
Data Center Plans Face New Scrutiny
The market reaction reflects concern that AI infrastructure growth depends on more than demand for chips and cloud computing. Large data center projects require electricity, water, land, permits and tax arrangements. If public officials change how those costs are allocated or how projects are approved, developers could face delays or higher expenses.
That matters to investors because data center construction supports spending across technology, utilities and construction. A slowdown could affect companies building facilities as well as chip suppliers and cloud providers. But Thursday’s selloff records investor expectations, not a confirmed change in project economics. The available reporting does not establish that planned construction has been cancelled or that the election results have already altered federal rules.
For businesses and savers, the day also shows how quickly uncertainty about a long-term investment boom can affect share prices. The Nasdaq-100’s $2.5 trillion estimated loss is a measure of market value at a point in time, not a cash outflow from the companies or a forecast of future losses.
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Election Results and Project Approvals
The selloff followed elections in which Democrats won control of Congress and several governorships, according to the supplied source material. Some of the states with new governors are expected to host substantial future data center development. Reuters and The National quoted analysts who identified possible areas of policy debate: congressional oversight, tax incentives, utility costs and project permitting.
The market’s response shifted over the two sessions. On Wednesday, Nov. 4, the Composite rose 1.44%. Reuters reported that some data center operators and power companies fell that day, while Amazon and Microsoft rose about 6% during the session. One strategist told Reuters that existing data centers might become more valuable if fewer new facilities were built. On Thursday, that pattern reversed: Reuters reported Amazon and Alphabet down 2.2% and Microsoft down 3.6%.
The supplied account also says the Composite had lost 5.3% in October and that Nov. 5 was its fifth daily drop of more than 500 points since mid-October. Those movements show the selloff followed a period of weakness, rather than beginning with the election results alone.
“Existing data centers become more valuable if fewer new ones get built.”
— A strategist quoted by Reuters
Policy Changes Remain Unsettled
No new federal law has passed changing data center approvals or costs, according to the supplied reporting. The scope of any congressional oversight, changes to tax incentives, or requirements for developers to pay more of their power and water costs remains unclear. New governors’ stated positions may affect projects within their states, but the material provided does not specify enacted measures or final permitting decisions.
A UBS estimate cited in the source says about 30% of planned capacity additions for 2028 could be at risk. That is an estimate, not a government decision or a confirmed count of cancelled projects. The source does not provide enough detail to assess the estimate’s assumptions, and it is not clear how much of Thursday’s market fall reflected data center policy concerns versus other market factors.
Investors Watch Policy and Projects
Investors will be looking for concrete signals from Congress, state governments and project developers about permits, tax treatment and infrastructure costs. The next steps in those processes, including whether any proposals become formal policy, are not specified in the source material.
Further market sessions may show whether the Nov. 5 decline is followed by additional selling or a recovery. The figures reported here are closing data for that session; they do not settle how election results will affect construction schedules, company spending or future share prices.
Key Questions
How much did the Nasdaq Composite fall?
It fell 5.52% on Nov. 5, 2026, closing at 24,315.00, down 1,421.51 points, according to Nasdaq index data.
What does the $2.5 trillion figure measure?
Reuters estimated that the Nasdaq-100, comprising 100 of Nasdaq’s largest non-financial companies, lost about $2.5 trillion in market value. The figure does not cover every Nasdaq-listed stock.
Did the midterm results change data center rules?
The supplied reporting says no new federal law has passed. Investors were responding to possible changes in oversight, incentives, costs and approvals; the eventual policy effects remain uncertain.
Were data center projects cancelled?
The source material does not confirm cancellations. A UBS estimate says about 30% of planned 2028 capacity additions could be at risk, but that is a forecast rather than a record of projects that have been stopped.
Source: Thorsten Meyer AI
