Stock Market After Midterm Elections: What S&P 500 History Shows

Highlights

Historical S&P 500 data suggests stocks have generally performed well after U.S. elections, regardless of which party wins. Across presidential and midterm elections from 1980 through 2024, average returns were modest over the first day and week, then stronger after a month. One year later, average gains were 13.7% after midterms and 13.8% after presidential elections, with positive returns in 91% of cases. The index rose after all 11 midterms from 1982 through 2022. Divided government has historically coincided with stronger average returns, but elections are only one influence. Federal Reserve policy, company earnings, AI investment, and geopolitical risks can outweigh the electoral result.

Sentiment Analysis

• Overall tone: Cautiously optimistic. Historical results offer reassurance that the S&P 500 has often advanced in the year after elections, including after every midterm in the cited period.
• Positive factors: Average one-year returns were substantial after both kinds of elections, and divided government was associated with a higher average gain than single-party control. The article also notes the possibility of a seasonal rally.
• Qualifications: Short-term returns were less dependable, and the historical averages do not establish that election outcomes caused market moves. Major economic and market forces can dominate.
• Risks: The article identifies uncertainty around Federal Reserve policy, corporate earnings, AI-related technology declines, bond yields, France’s debt concerns, and the war with Iran. These risks temper the positive historical picture.
• Sentiment reading: The article’s stance is mixed but leans positive: history is encouraging, while current conditions and the limits of historical comparisons call for caution.

Article Text

Investors often approach U.S. midterm elections with uncertainty, concerned that a change in control of Congress could affect policy, business conditions, and financial markets. Historical performance, however, offers a broadly reassuring picture. An analysis by CNBC of S&P 500 returns after elections from 1980 through 2024 found that the index typically gained ground over time after both midterm and presidential contests. The results were not consistently positive at every short-term interval, and they do not mean that elections alone determine market direction.

Across the presidential and midterm elections in the analysis, the S&P 500 gained an average of 0.2% after one day and one week, and 1.1% after one month. A year after an election, the average increase was 13.7% following midterms and 13.8% following presidential elections. Returns were positive in 91% of cases. The index also rose in the year after all 11 midterm elections from 1982 through 2022. These figures describe historical outcomes rather than a guarantee about future returns.

The immediate response was less consistent, particularly after presidential elections, which had slightly negative average returns after one day and one week. Ryan Detrick, a CNBC contributor and chief market strategist at Carson Group, described investors as anxious before elections and said markets often respond with relief once the event has passed. His comments reflect one interpretation of the pattern: uncertainty may ease after results are known. Even so, a short-term market reaction can be affected by many developments unrelated to the vote.

One historical pattern concerns divided government, in which one party controls the White House while the other holds at least one chamber of Congress. Across 10 midterm and five presidential elections that produced no single-party control, the S&P 500 rose an average of 15% over the following year. Returns were positive in 14 out of 15 cases. By comparison, after elections resulting in single-party control, the average one-year gain was 11.5%. Detrick suggested that markets may be less comfortable with a decisive sweep because it could bring greater spending or policy power in one direction. These comparisons show an association, not proof that divided government causes stronger returns.

A narrower historical comparison looks at midterms in which Democrats controlled both houses of Congress while a Republican was president. This occurred in 1986, 1990 and 2006. CNBC’s analysis found an average decline of 0.5% on the reaction day, followed by an average gain of 3.4% a month later and 10.9% after a year. The small number of elections makes the comparison useful as context but not as a reliable forecast for a future market response.

Some of the largest post-election moves illustrate why other forces matter. The S&P 500 fell 22.1% in the year after the 2000 elections, the worst post-election performance since 1980, as the dot-com bust weighed on stocks. At the other extreme, the index gained 38.3% in the year after the 2020 elections, following a substantial recovery from the COVID-induced selloff. These contrasting episodes show how economic and market conditions can overwhelm a simple election-based narrative.

Federal Reserve policy and the corporate earnings cycle are among the factors that investors may need to watch more closely than election outcomes. In 2018, stocks declined after midterms in which Democrats gained control of the House, but the Federal Reserve also tightened policy and raised interest rates four times that year. The S&P 500 finished the year down 6.2%, although it stood 11.7% higher one year after the election. The sequence underscores the difficulty of attributing market performance to one event when monetary policy and other economic developments are changing at the same time.

Current risks add further uncertainty to historical comparisons. The article identifies AI-related investment and technology-sector declines as a major swing factor, alongside rising global bond yields and debt concerns in France. It also points to the possibility that the war with Iran could intensify if Donald Trump followed through on threats of additional strikes or Iran escalated. Jim Reid, Deutsche Bank’s global head of macro and thematic research, cautioned that seasonality does not determine outcomes and that these concerns will not simply disappear.

The historical record therefore supports a measured conclusion. The S&P 500 has often risen after elections, with especially strong average one-year results in the cited data, and divided-government outcomes have historically coincided with higher average gains. But election history is only one reference point: monetary policy, earnings, technology-sector trends, bonds, and geopolitical events remain central to market performance. A seasonal rally may occur, but past patterns cannot establish what the market will do next.

Key Insights Table