Stock market after midterm elections: what the 2026 whiplash and 80 years of data tell investors

The stock market after midterm elections has a strong historical record: the S&P 500 has been higher 12 months after every midterm vote since 1946, according to Carson Investment Research. The 2026 vote tested that pattern within 48 hours. Stocks surged on Nov. 4 after Democrats won control of both chambers of Congress, then gave it all back on Nov. 5 as chip stocks collapsed.

This guide sets out what happened in the week of Nov. 2 to Nov. 6, 2026, what eight decades of post-midterm data show, where the 2026 setup differs from the averages, and what US and UK investors may want to watch before the new Congress is sworn in in January 2027. Market figures are as of the Nov. 6, 2026 close unless stated.

What happened to stocks after the 2026 midterm elections?

US stocks swung hard in both directions. The S&P 500 rose 1.58% on Nov. 4 as investors priced in gridlock and a quicker end to the Iran conflict, then fell 4.4% on Nov. 5 when chipmakers sold off on fears of tighter data center rules. The index closed the week down 2.7%.

The table below shows the daily closes for the three main US indexes. S&P 500 values match the St. Louis Fed’s FRED series; the Dow and Nasdaq figures come from Zacks Investment Research’s daily market reports.

Nov. 4: the relief rally

The first full session after the vote was the Dow’s best day since April 9, 2025, according to ABC News. Motley Fool data put it as the index’s strongest post-midterm session since Nov. 3, 1982, when the Dow gained 4.25%. Oil drove much of the move. Brent crude settled at $94.62 a barrel, down 8.67%, and West Texas Intermediate fell 8.29% to $88.12, as traders bet that Republican losses, which Vice President JD Vance linked to the Iran war, would push the White House toward de-escalation. Gold rose about 3.3% to roughly $4,070 an ounce, and the 10-year Treasury yield slipped from 4.95% to 4.90%, according to FRED’s DGS10 series.

The rally was uneven. Microsoft Corp. (NASDAQ: MSFT) and Amazon.com Inc. (NASDAQ: AMZN) each gained more than 6%, while chip stocks already lagged: NVIDIA Corp. (NASDAQ: NVDA) fell 3.2% and Micron Technology Inc. (NASDAQ: MU) dropped 7% that day.

Nov. 5: the chip sell-off

The next day the Nasdaq Composite lost 5.5%, its worst session since April 2025, and the PHLX Semiconductor Index (SOX) fell 12.25%, according to Yahoo Finance. Nvidia closed down 9.26%, Micron down 17.46% and Advanced Micro Devices Inc. (NASDAQ: AMD) down about 17%. The Cboe Volatility Index (VIX), which had dropped to 16.61 on Nov. 4, touched 27.45 during the session. On Nov. 6 Nvidia recovered 2.78% and Micron 5.12% after President Trump said he fully backed the AI build-out, but the major indexes still ended the week lower.

For a live view of the indexes and sector moves, see our daily US market dashboard.

Chart: SPDR S&P 500 ETF Trust (AMEX: SPY), a fund that tracks the S&P 500. Data is supplied by TradingView and may be real-time or delayed depending on the exchange. The chart is for information only and is not a trading recommendation.

What does history say about the stock market after midterm elections?

History is favourable but not a guarantee. Measured from the last close before Election Day to one year later, the S&P 500 has risen after all 20 midterms from 1946 to 2022, with an average price gain of about 15%. The record weakens on longer data sets, and the size of the gain has varied from under 1% to more than 30%.

Different research houses use different start dates and windows, which is why the averages do not match exactly:

• LPL Research (Jeff Buchbinder and Kent Cullinane) counts 18 positive 12-month periods out of 18 since 1954, with an average gain of 18.2%.
• Fidelity Viewpoints (Oct. 26, 2026) says prices rose in the year after a midterm 95% of the time since 1938, with an average of about 14% since 1950.
• Carson Investment Research (Ryan Detrick) counts 20 of 20 since 1946, averaging about 15%.
• U.S. Bank Asset Management (updated Nov. 5, 2026) puts the average at 12.4%, or 17.5% since 1980, and notes that Dow data going back to 1900 shows stocks did not rise after every midterm.

The midterm effect is a term for the tendency of US stocks to struggle during a midterm election year and then recover once the vote removes policy uncertainty. LPL calculates an average peak-to-trough drop of 17.5% in midterm years, and Carson says the S&P 500 has gained close to 32% on average in the year after the midterm-year low. The 2026 version was mild by that standard: Fidelity reported the S&P 500 up more than 11% for the year as of Oct. 23.

Past midterms where control of Congress changed

Averages hide a wide range. The years when the president’s party lost a chamber are the closest comparisons for 2026, and their results were mixed.

The three weakest post-midterm years since 1946 (1946, 1986 and 2010) all came after the opposition took at least one chamber. That does not prove cause and effect, because each year had its own shocks, but it is a reason to treat the 15% average with caution in 2026.

Is a Republican president with a Democratic Congress bad for stocks?

On past averages, this mix has lagged. Carson Investment Research data cited by Bloomberg on Nov. 4, 2026 shows the S&P 500 averaging about 4.9% a year since the early 1950s when a Republican president faced a fully Democratic Congress, against about 14% with a Republican president and a split Congress. The sample is small, so the gap may reflect a few bad years.

Divided government is the situation in which one party holds the White House and the other controls at least one chamber of Congress. The usual argument linking divided government to the stock market after midterm elections is that gridlock limits big tax or spending changes, which markets can find easier to price. Fidelity’s Anu Gaggar put it plainly in the firm’s October note: “Markets love gridlock.” U.S. Bank’s data is less supportive: since 1948 it finds average three-month returns of 2.42% under one-party control and 2.17% under mixed control, a gap it says is not statistically significant, and only 1.19% for a Republican president with a Democratic Congress.

What the new Congress can and cannot do matters more than the label. Democrats will need President Trump’s signature, or a two-thirds majority to override a veto, to pass laws. Trump told Politico on Election Day that he would work with Democrats but would use his veto. In practice, the biggest levers for a Democratic House and Senate are oversight hearings, the annual appropriations bills, the debt limit and Senate confirmation of nominees, including future Federal Reserve appointments.

How did the data center vote hit AI and chip stocks?

Voters across several states rejected new data center projects on Nov. 3, and investors read the results as a warning for AI spending. Al Jazeera, citing Redbud’s “Data Centers on the Ballot” tracker, reported that voters turned down data centers in 40 of 41 local measures. That fear, plus profit-taking in crowded AI trades, drove the Nov. 5 chip sell-off.

The most watched race was in Texas, home to some of the largest planned AI campuses. Governor-elect Gina Hinojosa, who defeated Greg Abbott, has pledged a moratorium on new data center approvals until the Legislature passes protections, along with water safeguards and an end to tax subsidies for the projects, according to the Texas Tribune. She takes office on Jan. 19, 2027.

The link between those votes and chip earnings runs through capital spending. Hyperscalers such as Microsoft, Amazon and Alphabet Inc. (NASDAQ: GOOGL) buy the processors and memory that Nvidia, AMD and Micron sell. If permits, power hookups or tax breaks for new data centers slow down, orders could arrive later than the market expects. Local and state rules do not stop construction elsewhere, and none of the measures cancels existing contracts, so the near-term earnings impact is uncertain. Our Nvidia stock analysis for 2026 covers the company’s data center exposure in more detail.

Our view: the Nov. 5 move looks like a valuation reset in the most crowded part of the market more than a verdict on AI demand. Semiconductor shares had run far ahead of the broader index in 2026, and Nomura strategist Charlie McElligott described the selling as “shooting the generals”, meaning investors cut the biggest winners first. A second sell-off would be more worrying if it came with cuts to hyperscaler spending plans in the next round of earnings.

Rates, oil and gold: what else is moving markets in November 2026?

Interest rates and energy prices matter more to stock returns than the election itself. The Federal Reserve held its target range at 3.75% to 4.00% on Oct. 28, with two officials voting for a hike, and the Bank of England raised Bank Rate to 4.0% on Nov. 5. Oil remains well above summer levels because of the Middle East conflict.

The Federal Reserve

The Federal Open Market Committee statement of Oct. 28, 2026 kept the federal funds target range at 3.75% to 4.00% on a 10 to 2 vote. Governor Lisa Cook and Cleveland Fed President Beth Hammack dissented in favour of a 25 basis point increase. Chair Kevin Warsh’s committee meets next on Dec. 8 and 9. A Democratic Senate will have a say on any future Fed nominations, which could affect how the market prices the rate path into 2027. The 10-year Treasury yield ended Nov. 5 at 4.84%, according to FRED. You can follow the curve on our Treasury yields page.

The Bank of England

The Bank of England’s November 2026 Monetary Policy Summary raised Bank Rate by 25 basis points to 4.0% on an 8 to 1 vote, with Catherine Mann preferring a 50 basis point rise. UK CPI inflation was 3.5% in September, and the Bank projects it will reach about 5% in the second quarter of 2027, largely because of higher energy costs. MoneySavingExpert described it as the first rise in more than three years. For UK readers, that means a higher-rate backdrop at home regardless of what happens in Washington.

Oil and gold

Oil’s 8% fall on Nov. 4 partly reversed by Nov. 6, with WTI back near $90 and Brent near $98, according to market recaps. The Bank of England said Brent was 38% above its July level when it made its decision. Gold has held above $4,000 an ounce; our gold price tracker shows the latest spot price.

What the midterm result means for US and UK investors

For long-term investors, the 2026 result changes the odds of some policies more than the case for owning stocks. The record of the stock market after midterm elections is a starting point, not a forecast. The strongest historical pattern, gains in the year after a midterm, has held in every cycle since 1946, but the size of the gain has depended on earnings and interest rates, which remain the main drivers in 2027.

Our view on the points worth tracking, with the caveat that none of this is personal advice:

1. Valuation. Fidelity reported the S&P 500 up more than 11% for 2026 as of Oct. 23. High starting valuations have tended to mean smaller future returns, a theme we cover in our explainer on whether stocks look cheap against bonds.
2. Sector spread. Energy, defense and AI infrastructure are most exposed to policy shifts from a Democratic Congress, through appropriations, oversight and state-level permitting. Broad index funds dilute that exposure; concentrated positions do not.
3. The calendar. The new Congress is sworn in on Jan. 3, 2027, and Hinojosa takes office in Texas on Jan. 19. Fed meetings on Dec. 8 and 9 and the next round of big tech earnings will likely move markets more than any early bill.
4. Currency for UK investors. A pound-based investor in US shares also carries dollar risk. With the Bank of England tightening while the Fed holds, sterling moves can add to or offset returns on US holdings.
5. Concentration. The Nov. 5 fall showed how much of the US market now rides on a small group of AI and chip stocks. Investors who hold S&P 500 trackers have more exposure to that group than many realise.

Sam Stovall, chief investment strategist at CFRA, told WealthManagement.com that earnings and interest rates drive the market more than politics, and he kept a year-end S&P 500 target of 8,050. That target is about 9% above the Nov. 6 close; it is one forecast, not a consensus.

Risks that could break the post-midterm pattern

Several risks could make the stock market after midterm elections behave differently this time. The main ones are inflation and rates, the Middle East conflict and oil, an AI spending slowdown, and fiscal standoffs between the White House and Congress. Any one of them could outweigh the seasonal tendency that the averages describe.

• Inflation and rates: two Fed officials already favour a hike, and the Bank of England has moved. A higher-for-longer rate path would pressure stock valuations.
• Energy: the Bank of England’s inflation forecast depends heavily on oil and gas prices. A wider conflict would raise costs for consumers and companies.
• AI capital spending: if data center restrictions spread or hyperscalers cut budgets, chipmakers’ earnings forecasts could fall, and they now carry a large weight in the index.
• Fiscal fights: a Democratic Congress and a Republican president will need to agree on funding the government and on the debt limit. Past standoffs, such as the 2011 debt ceiling fight, caused sharp but short sell-offs.
• Small samples: 20 midterms is a short record, and the averages cannot account for events like the 1987 crash.

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