Key Takeaways

• The midterm elections stock market reaction was uneven: Nasdaq 100 futures were down 1.5%, S&P 500 futures 0.74% and Dow Jones futures 0.35% at 20:53 (ET) on 3 November, after early midterm counts leaned Democratic.^[1]
• The US stock market ended the 3 November cash session mixed: the Nasdaq rose 0.83% and the S&P 500 0.36%, while the Dow fell 0.38%.^[2]
• The Associated Press called the Senate for Democrats late on 3 November, while the House was still too early to call in AP copy at 23:46 (ET).^[2,8,9] Morgan Stanley had expected Democrats to win the House.^[3] That would mean divided government with a Republican in the White House, and the Nasdaq 100 is the index that has reacted most.

The midterm elections stock market story opened with a split screen. Nasdaq 100 futures were down 1.5% at 20:53 (ET) on 3 November, more than four times the 0.35% fall in Dow Jones futures, as the first midterm election counts leaned Democratic.^[1] S&P 500 futures sat in between, 0.74% lower.^[1] Market figures are the latest timestamped quotes available, and election calls are as reported by 13:00 (GMT+8) on 4 November 2026. Nasdaq 100, Dow Jones and S&P 500.

Same election, three indices, three very different reactions. This piece looks at why the index closest to the AI trade moved furthest, how analysts framed a Democratic sweep, a split Congress and a Republican hold, and what would change that read. It is written for traders who follow US indices and want the scenarios laid out without anyone calling the next move.

The count was still moving as this was written. Decision Desk HQ projected a Democratic Senate at around 23:20 (ET),^[2] and AP copy at 23:40 (ET) said Democrats had retaken the chamber.^[8,9] The House was the slower call: VoteHub projected Democratic control at 21:23 (ET),^[2] but AP still called it too early to call, with Democrats needing a net gain of three seats.^[8]

Quick answer: midterm elections and the stock market

The Associated Press called the Senate for Democrats late on 3 November, with the House leaning their way. Nasdaq 100 futures fell 1.5% against 0.74% for the S&P 500 and 0.35% for the Dow. Analysts watch data-centre policy. Past returns after midterms have been positive.

Checklist traders are watching

• The AP call on the House, and the final size of the Democratic Senate majority.
• Data-centre and AI-infrastructure policy headlines.
• The 10-year Treasury yield, which sources reported at slightly different levels after the 3 November close.
• The VIX, at 20.83 at the same close.^[5]
• Sector moves in health care, defence and energy.

Three outcomes, and the one now unfolding

Before the count, the stock market midterm elections question was less who wins than which combination. Morgan Stanley’s Monica Guerra, head of US policy and geopolitical strategy at Morgan Stanley Wealth Management, expected Democrats to win the House, needing a net gain of three seats, and called the Senate a toss-up with a slight Democratic edge.^[3] A Democratic House alone means divided government, whichever party holds the Senate.^[3] With the Senate now called for Democrats,^[8] the first row of the table below is the live one.

Outcome	How analysts framed it	Index most in the frame
Democratic sweep scenario (Senate called; House not yet called)	JPMorgan scenario work, relayed by Yahoo Finance, put the S&P 500 about 0.5% lower on Wednesday.[5] TheStreet relayed 66% odds on this outcome, with the S&P 500 between -0.25% and +0.50%.[2] Goldman Sachs saw data-centre tax incentives at risk but a nationwide moratorium as unlikely.[5]	NAS100
Democratic House, Republican Senate (Senate now called for Democrats)	JPMorgan traders saw a potential gain of up to 1% for the S&P 500 if Republicans kept the Senate.[5] Morgan Stanley found an average 23% S&P 500 return in the year after midterms under split control and a Republican president.[3] The Senate call takes this off the table.[8]	SP500
Republican hold	Not modelled in the sources reviewed, and the Senate has now gone Democratic.[8]	Not assessed

Table 1: S&P 500 midterm elections scenarios, analyst framing as of 4 November 2026. Sources: Morgan Stanley, Yahoo Finance. Indicative only.

Nasdaq 100 took the biggest hit

At 20:53 (ET) on 3 November, Nasdaq 100 futures stood at 27,887.0, S&P 500 futures at 7,540.50 and Dow Jones futures at 51,723.0.^[1] All three quotes share one timestamp, so the gap reflects index composition, not timing. The Nasdaq midterm elections reaction was the loudest of the three: about twice the S&P 500’s move and more than four times the Dow’s.

The move coincided with the early counts, but the tape was crowded. Apple and Palantir traded lower on 3 November after their results,^[2] Investing.com pointed to technology declines through October,^[1] so no single driver explains the 1.5%.

Positioning may explain why the reaction stayed contained. Tobin Marcus, head of US policy and politics at Wolfe Research, pointed to a survey of more than 100 institutional investors suggesting portfolios were not strongly positioned for a particular outcome.^[5]

The Nasdaq 100 also walked into the vote after a rough month. Vantage’s 19 October analysis recorded a 4.48% weekly fall in the Nasdaq as hotter inflation, debt-funded AI spending and a run of chip losses piled on, and the 13 October piece tracked chip stocks lower with Brent near $106. So why did the Nasdaq 100 fall twice as far as the S&P 500? The sector arguments answer it.

Data centres are the policy fault line

The textbook assumption is that a Democratic sweep means broad risk-off, yet Dow Jones futures fell only 0.35%.^[1] What the sources flag is narrower, and it has a postcode: data centres. Investors were watching whether Democratic gains would strengthen efforts to restrict them or revisit their incentives.^[5] Goldman Sachs strategists saw limits: a Democratic Congress could curb data-centre tax incentives, but a nationwide moratorium looked unlikely under any outcome.^[5] Morgan Stanley said regulatory or subsidy headlines could prompt pullbacks, particularly in technology and energy.^[3]

That is the Turn. The index-level cost of the election looks small on paper, but the Nasdaq 100’s larger overnight move points to a narrower bet: that data-centre policy is where a Democratic Congress could touch the AI trade. Think of three seats in one theatre: the nearer the AI stage, the harder the floor appeared to shake.

Nasdaq 100 futures fell about twice as far as S&P 500 futures, and more than four times as far as Dow Jones futures, on the same night.

What history says about a Democratic Congress and a Republican president

Midterm election stock market history gives context, not a script. Morgan Stanley found that, with a Republican in the White House, the S&P 500 averaged about 16% in the calendar year after a midterm when Democrats controlled both chambers, and 23% when control was split.^[3]

If Democrats end up holding both chambers, the 16% is the closer comparison. CNBC’s analysis, relayed by Yahoo Finance, found the index higher one year after every midterm from 1982 to 2022.^[5] Past performance is not a reliable guide to future results. Vantage’s explainer on what US stocks did after past midterm votes and the Academy’s guide to how US elections have affected the stock market cover the longer record.

The divided government stock market record rests on one mechanism: gridlock limits big legislative change. Morgan Stanley said divided government would materially limit the scope for major legislation affecting government funding or corporate costs.^[3] Monica Guerra made the wider point in September: “Divided government is not always bad for markets.”^[4]

Other strategists agree on timing. Brooke Thackray, writing for BNN Bloomberg in September, argued that markets tend to bottom about a month before the vote and trend slightly positive afterwards.^[6] Ryan Detrick, market strategist at Carson Group, shared a chart in April showing average gains of 31.7% one year after midterm years, though the source does not state the period it covers.^[7] Studies use different windows, so figures differ from Morgan Stanley’s.

The Dow Jones midterm elections reaction was the mildest of the three. The Dow (DJ30, US30) is a 30-stock, price-weighted average, so it is built differently from the Nasdaq 100, which is one possible reading of why it moved less.

Yields and delays can outweigh the ballot

Guerra framed the election as one input among several. Congressional control could affect spending and regulatory oversight, she wrote, but the business cycle matters more for broad market performance than which party holds Congress.^[3] Morgan Stanley also said the election alone is unlikely to substantially change the longer-term path for rates or the deficit, though a close count could cause short-term volatility.^[3] The backdrop is not quiet either. The 10-year Treasury yield stayed elevated after the 3 November close, the VIX was at 20.83,^[5] and last week’s University of Michigan sentiment reading was the second-lowest in the survey’s history, according to TheStreet.^[2]

Vantage’s 30 October analysis tracked the S&P 500 slipping as Alphabet fell 12.6% on AI spending worries, and the 2 November analysis followed an AI-led rebound. Rates and AI spending were moving the tape before the count.

What to watch

• House call and final US election results, 4 November onwards: Democrats had secured at least 51 Senate seats in the midterm election results 2026 reported so far, and the House was still uncalled.^[8,9]
• US Nonfarm Payrolls (October), Friday 6 November, 21:30 (GMT+8): The first major jobs read after the vote.
• US CPI (October), Tuesday 10 November, 21:30 (GMT+8): Sets the tone for yields.
• Nvidia third-quarter FY27 results, Tuesday 17 November (after the US close): The largest single AI-capex read for the Nasdaq 100.
• FOMC decision and dot plot, Wednesday 9 December: The next scheduled test for rate expectations.

What would change the read: if the Nasdaq 100 gap versus the S&P 500 narrows without new data-centre headlines, earnings and yields did more than the count.

Gap risk around election counts

Counts and calls can land outside cash-market hours, and index CFDs can reprice with futures when they do, so a price can open away from where it closed. Three tickers tied to one election can move together, which makes combined exposure across SP500 (US500), NAS100 and DJ30 worth checking as one position rather than three. The Academy’s guide to risk management techniques covers the basics.

Back to the opening gap: overnight, the index closest to the AI trade did move furthest. Whether that reflects data-centre policy, earnings, yields or all three will not be settled by a quote screen.

A Stop Loss can help limit a loss to a planned size, but a gap can skip past it and fill at a worse price. Leverage magnifies gains and losses equally, so on an event-driven day a position that looks modest can move a large share of account equity. Position sizing in percentage-of-equity terms, set before the event rather than during it, is the information worth having in hand.

Frequently asked questions

Do midterm elections affect the stock market?

Historically the effect has been modest and short-lived. Morgan Stanley said an election alone is unlikely to substantially change the longer-term path for rates or the deficit.^[3] Sector policy, such as data-centre rules, tends to matter more than the headline result.

What happens to the stock market after midterm elections?

Morgan Stanley found the S&P 500 averaged about 16% in the calendar year after midterms with Democrats controlling both chambers and 23% under split control, with a Republican president.^[3] Past performance is not a guide to future results.

Which index is most exposed to a Democratic sweep?

On overnight evidence, the Nasdaq 100: its futures fell 1.5% against 0.74% for the S&P 500 and 0.35% for the Dow at 20:53 (ET) on 3 November.^[1] Analysts link the gap to data-centre policy risk, though earnings also moved the tape.^[2,5]

How do midterm elections affect the stock market?

Mostly through policy expectations for sectors, rates and the deficit, not the result alone.^[3]

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Disclaimer: The information is provided for educational purposes only and doesn’t take into account your personal objectives, financial circumstances, or needs. It does not constitute investment advice. We encourage you to seek independent advice if necessary. The information has not been prepared in accordance with legal requirements designed to promote the independence of investment research. No representation or warranty is given as to the accuracy or completeness of any information contained within. This material may contain historical or past performance figures and should not be relied on. Furthermore estimates, forward-looking statements, and forecasts cannot be guaranteed. The information on this site and the products and services offered are not intended for distribution to any person in any country or jurisdiction where such distribution or use would be contrary to local law or regulation.

References

[1] “U.S. stock futures slide as Dems lead early midterms results; AMD rises – Investing.com” https://za.investing.com/news/stock-market-news/us-stock-futures-steady-with-midterms-in-focus-amd-rallies-on-strong-earnings-4547923 Accessed on 4 November 2026.

[2] “Stock Market Today (Nov. 3, 2026): Live U.S. midterm election updates after stocks register mixed session – TheStreet” https://www.thestreet.com/stock-market-today/stock-market-today-dow-jones-sp-500-nasdaq-updates-nov-03-2026 Accessed on 4 November 2026.

[3] “2026 Midterms: Seven Questions That Matter for Markets – Morgan Stanley” https://www.morganstanley.com/insights/articles/2026-election-market-impact-investor-guide Accessed on 4 November 2026.

[4] “The Midterm Election Signals Investors Should Watch – Morgan Stanley” https://www.morganstanley.com/insights/articles/midterm-election-market-impact-2026 Accessed on 4 November 2026.

[5] “A Democratic Sweep in the Midterms Could Rattle Stocks: Some in Wall Street Are Bracing – Yahoo Finance” https://finance.yahoo.com/markets/stocks/articles/democratic-sweep-midterms-could-rattle-194401634.html Accessed on 4 November 2026.

[6] “U.S. midterm elections set to bring a buying opportunity: Brooke Thackray – BNN Bloomberg” https://www.bnnbloomberg.ca/investing/opinion/2026/09/03/us-midterm-elections-set-to-bring-a-buying-opportunity-brooke-thackray/ Accessed on 4 November 2026.

[7] “EXCLUSIVE: Ryan Detrick Shares A Political Trend For 2026 That Has Produced ‘Some Really Solid Returns’ – Yahoo Finance (Benzinga)” https://finance.yahoo.com/markets/stocks/articles/exclusive-ryan-detrick-shares-political-104746864.html Accessed on 4 November 2026.

[8] “Democrats take control of the Senate after winning key midterm races – PBS NewsHour (Associated Press)” https://www.pbs.org/newshour/politics/democrats-take-control-of-the-senate-after-winning-key-midterm-races Accessed on 4 November 2026.

[9] “Democratic Party flips US Senate in 2026 midterm elections – Al Jazeera” https://www.aljazeera.com/news/2026/11/4/democratic-party-flips-us-senate-in-2026-midterm-elections Accessed on 4 November 2026.