4 November 2026: Americans voted in the US midterm elections on Tuesday, deciding control of the House of Representatives and the Senate for the next two years. With voting under way and results not yet known, many investors are asking the same question: what does the outcome mean for the stock market? Here is what Wall Street expected before the vote, what history shows, and what to keep in mind.
Key points:
- Before the vote, polls pointed to a Democratic House win and a close Senate race, while prediction markets leaned towards Democrats winning both chambers.
- JPMorgan saw a Democratic sweep as the most likely scenario (66%), with a split Congress at 26%.
- Historically, the S&P 500 has risen in the 12 months after every midterm election since World War II, according to Wells Fargo.
- Analysts at Morgan Stanley and Fidelity say interest rates, inflation and the economy usually matter more for markets than election results.
What Wall Street expected before the vote
Going into Election Day, prediction market traders on Kalshi put Democrats’ chances of winning the Senate at about 74%. JPMorgan’s scenario analysis gave a Democratic sweep a 66% likelihood and a split Congress (Democratic House, Republican Senate) 26%. In a split-Congress outcome, JPMorgan expected the S&P 500 to gain around 0.5% to 1%.
According to CNBC, some investors warned that stocks were not fully pricing in a Democratic sweep, which could weigh on shares in the short term, particularly in areas such as AI infrastructure and defence. Citigroup said a Republican loss of the House while holding the Senate could be a tailwind for stocks into year-end.
What history shows
| Pattern | What the data shows |
| 12 months after midterms | The S&P 500 has risen after every midterm election since World War II (Wells Fargo) |
| Divided government | One-year gains have averaged around 15%, versus 11.5% under single-party control (historical analysis cited by CNBC) |
| Short term | Moves in the days after an election are harder to predict and can be volatile |
These patterns are interesting, but they are based on a small number of elections and different economic conditions each time. They do not guarantee what will happen this year.
The bigger forces for markets
Most analysts agree that elections are a secondary driver of markets. Morgan Stanley says issues such as trade policy, geopolitics and regulation are likely to matter more than the midterm outcome itself. Right now, investors are also focused on:
- Interest rates: the Federal Reserve has resumed rate hikes, and the 10-year Treasury yield is close to 5%. See Treasury yields edge toward 5%.
- Inflation and energy prices: higher oil prices have kept inflation above target.
- AI spending: questions about the sustainability of heavy AI investment have weighed on tech stocks recently.
- Valuations: the S&P 500 was up about 10.8% this year as of 2 November, and some strategists worry investors are complacent.
How investors can prepare
- Avoid knee-jerk decisions: reacting to headlines can lead to buying high and selling low.
- Check your diversification: make sure no single sector or theme dominates your portfolio.
- Focus on your time horizon: long-term goals matter more than a few days of volatility.
- Keep some cash for opportunities rather than trying to time the market.
- If you trade short term, expect larger moves and wider spreads around results, and use smaller positions with a stop-loss.
We will cover the results and the market reaction once they are confirmed. For more on how central banks affect markets, read The Fed is raising rates again in 2026.
Risk warning: The value of investments can go down as well as up, and you may get back less than you invest. Past performance, including historical market patterns after elections, is not an indication of future results. This article is for information only and is not investment advice.
Sources
- CNBC: Midterm elections could jolt stocks if Democrats sweep Congress
- CNBC: How JPMorgan expects the market to react
- CNBC: Prediction market odds for the Senate
- Morgan Stanley: US midterm elections stock market impact
- Fidelity: How might midterm elections impact the stock market?