After midterm elections, have US stocks risen in all 19 instances? Historical patterns face three major variables in 2027: US Treasuries, inflation, and AI.

Note that historical analysis shows that US stocks have often continued to rise in the 12 months after midterm elections. But rising US Treasury yields, inflation risks, and uncertainty surrounding AI spending could test this pattern in 2027. This historical record gives investors reason to examine the period after the November 3, 2026 midterm elections. However, it does not guarantee another year of gains. Historical performance unfolded under very different economic conditions, and some of the strongest post-election periods also experienced significant drawdowns along the way. The question investors face is whether the next 12 months can replicate this historical pattern, or whether current inflation concerns, elevated US Treasury yields, fiscal uncertainty, and doubts about AI-related capital spending will make this cycle different. The S&P 500 rose in all 19 instances within 12 months after midterm elections Historical data shows that across the three time periods examined (three months, six months, and twelve months after midterm elections), average returns were all positive. The strongest average performance occurred over the 12-month period. The average 12-month return was 15.1%, compared with 12.8% over six months and 6.3% over three months. This pattern suggests that over longer measurement periods, the upward tendency is more stable than the moves immediately following Election Day. Results were not uniformly strong. The 12-month return range spanned from 1.1% to 33.2%, a spread of more than 32 percentage points. Short-term performance was also less stable: the index fell in the first three months after the 2002 and 2018 midterm elections, then recovered, with both periods ending with positive 12-month returns. Therefore, the data points to a historical tendency rather than a smooth, uninterrupted post-election rally. The historical record is encouraging, but dispersion across cycles is wide. The 12-month return range spanned from 1.1% to 33.2%, a spread of more than 32 percentage points. The chart shows that positive 12-month outcomes were more consistent than short-term performance. Although two cycles began with declines in the first three months, both subsequently recorded positive six-month and 12-month returns. The historical record is encouraging, but averages alone do not tell the whole story. Why do stocks often perform better after midterm elections? There are several possible explanations for this historical pattern, though none proves that midterm elections themselves are the cause of stock market gains. Removal of political uncertainty Election campaigns bring uncertainty surrounding congressional control, fiscal policy, taxes, trade, regulation, and government spending. Once election results become clearer, investors can reassess the likely policy environment and adjust expectations. This may reduce one source of uncertainty and allow the market to refocus on corporate earnings, economic growth, and monetary policy. However, the removal of political uncertainty does not necessarily eliminate market risk. Contested results, policy disagreements, or prolonged legislative gridlock could extend uncertainty beyond Election Day. The third year of the presidential cycle Midterm elections occur in the second year of a presidential term. The following calendar year is traditionally known as the third year of the four-year presidential market cycle. Historical analysis shows that this is often the strongest year for US stocks within the presidential cycle. According to historical analysis cited by Pepperstone, from 1951 to 2023, the S&P 500's average return in the third calendar year of a presidential term was 17.2%. One explanation is that before the next presidential election, the government may prioritize economic growth and policies aimed at supporting business activity. However, this remains a historical observation rather than a reliable forecasting model. The possibility of divided government Investors generally view divided government as a potentially more favorable environment for stocks because it can limit sweeping legislative changes and reduce the likelihood of abrupt policy shifts. However, historical returns provide little evidence that divided government itself explains post-election gains. Of the 19 midterm elections since 1950, 14 produced divided government. During those periods, the S&P 500 rose an average of 15.1% over the following 12 months. After the five elections that produced unified government, the average return was almost identical, at 15.0%. This suggests that the political landscape itself may be less important than the economic and financial conditions at the time. Positive 12-month returns do not mean a smooth market recovery One of the biggest limitations of relying on historical averages is that they measure performance only at two points in time, not the volatility experienced in between. In 11 of the 19 post-midterm periods, the S&P 500 experienced a maximum drawdown of more than 10% within the following 12 months. The 1986 cycle is a particularly notable example. The index rose 17.5% in the six months after the election, but the October 1987 crash subsequently erased most of those gains. The benchmark fell 33.2% from its August peak to its October trough and ultimately ended the 12-month period up just 1.1%. The 2010 cycle provides another illustration. Although the S&P 500 rose 14% in the first six months after the election, it then struggled amid the US debt ceiling standoff, the downgrade of the nation's credit rating, and the European sovereign debt crisis. The index experienced a 19.4% drawdown and ultimately ended the 12-month period up 3.7%. In 2018, Federal Reserve rate hikes and escalating US-China trade tensions caused the index to fall 16.4% between November and December. Twelve months after the midterm elections, the index was still up 11.7%. The 2022 cycle also illustrates why investors should distinguish election-related dynamics from macro catalysts. The S&P 500 fell 2.1% the day after the election and then rose 5.5% the next day as lower-than-expected inflation data boosted expectations of a less aggressive Federal Reserve. The subsequent 12-month gain was 14.5%, even though the index experienced a 10.3% drawdown during that period. These examples show that the historical post-midterm pattern is no substitute for monitoring valuations, monetary policy, and economic risks. What is different about the 2026 midterm elections? The November 3, 2026 elections arrive as investors are weighing several competing forces. Since Trump returned to the White House in 2025 with a Republican-controlled Congress, the S&P 500 has risen about 27%, supported by strong corporate earnings and heavy investment in AI infrastructure. However, US Treasury yields have also risen sharply, and energy-driven inflation concerns and the US fiscal outlook have become important considerations for investors. This election could change the legislative environment for the final two years of Trump's term. All 435 House seats and 35 Senate seats will be up for election, tying the outcome closely to the direction of fiscal policy, regulation, trade, and government spending. The impact could vary by sector AI and technology: If Democrats win control of one or both chambers, congressional scrutiny of large technology companies, AI safety standards, and data center construction could intensify. This could bring additional regulatory uncertainty for companies investing heavily in AI infrastructure. Conversely, continued Republican control of Congress could support policy continuity, deregulation, and permitting initiatives, benefiting the AI infrastructure investment cycle. Defense and industrials: A decisive Republican victory could create more room for increased defense spending and tax policy changes. While this could benefit some defense and industrial companies, additional deficit-financed spending could also put pressure on US Treasury yields. Financials and broader US corporates: Changes in regulation, tax policy, and fiscal priorities could affect banks, insurers, and other capital-intensive businesses. However, the impact depends on the specific legislation advanced, not merely on which party controls Congress. US Treasuries and the dollar: The fiscal implications of the election may be particularly important for bond investors. If the election outcome raises concerns about government borrowing and debt sustainability, higher US Treasury yields could push up borrowing costs and weigh on equity valuations. Investors are also watching for a possible debt ceiling dispute and government funding negotiations in 2027. Therefore, the election matters not only because of which party gains control of Congress, but also because of how the outcome affects expectations for government spending, corporate investment, and the cost of capital. What investors should watch after Election Day The historical record provides a constructive starting point, but the market's next phase will depend on whether corporate earnings and economic conditions can support equity valuations. Three variables are particularly worth watching. Federal Reserve policy and US Treasury yields Interest rates remain one of the most important determinants of equity valuations. Higher US Treasury yields raise the discount rate applied to future corporate earnings, potentially weighing on growth stocks and companies whose valuations depend heavily on future cash flows. A sustained rise in yields could offset the positive effects of reduced political uncertainty. Corporate earnings and AI capital spending The strength of corporate earnings is crucial to sustaining the market rally. Investors need to assess whether AI-related investment is translating into measurable revenue growth, productivity gains, and operating profitability. Companies that continue to increase capital spending without demonstrating corresponding returns may face stricter scrutiny, especially when financing costs remain elevated. Inflation and economic growth The interaction between inflation and economic growth will shape the Federal Reserve's policy choices. A resilient economy with moderating inflation would provide a favorable backdrop for earnings and equity valuations. Conversely, persistent inflation could constrain monetary easing, while deteriorating employment and consumer demand could intensify recession concerns. The impact of these factors on market performance is likely to be more direct and lasting than the election outcome itself. Conclusion The historical evidence is hard to ignore. Since 1950, the S&P 500 has risen in all 19 instances within 12 months after midterm elections, with an average price return of 15.1%. However, this pattern should be viewed as a historical tendency, not a forecast. The nearly identical returns under divided and unified government suggest that congressional control itself is not a reliable determinant of post-election market performance. For 2027, investors need to look beyond political headlines. The direction of US Treasury yields, inflation, Federal Reserve policy, corporate earnings, and the returns generated by AI-related investment will be more important in determining whether the market can extend its historical post-midterm rally. The election may remove one layer of uncertainty, but it cannot eliminate the economic and valuation risks that ultimately drive stock prices.