S&P 500 midterm rally streak faces 2026 market risks

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S&P 500 midterm rally risks

Highlights

The S&P 500 has risen in the six and 12 months after every Congressional midterm election since 1950, last falling after a vote in 1946.
The S&P 500's deepest drawdown in 2026 to date is 9%, compared to an average 18% peak-to-trough fall in midterm years since 1942.
U.S. equities enter the 2026 vote at a cyclically adjusted price-to-earnings ratio of 40.7, exceeding the previous midterm high of 33.8 in October 1998.

Why the 2026 midterm pattern looks less secure

As reported by the Financial Times, the S&P 500 has risen in the six and 12 months after every Congressional midterm election since 1950, with the last decline after such a vote occurring in 1946. The paper said that, over comparable six- and 12-month periods in other years since 1950, the index fell roughly a third of the time, suggesting the post-midterm record stands out from broader market behavior.

Analysts say the pattern is partly linked to uncertainty easing after an election, allowing investors to refocus on policy and economic fundamentals. Jordan Jackson, a global market strategist at JPMorgan, said markets tend to benefit once the political configuration becomes clearer after voting.

Some investors warn 2026 may not follow the historical script. Laura Cooper, head of macro credit at Nuveen, said stocks have already advanced substantially and face meaningful headwinds going into next year. The S&P 500's deepest decline in 2026 is 9%, compared with an average peak-to-trough fall of 18% in midterm years since 1942, according to Financial Times analysis, indicating this year's run-up has been relatively resilient rather than weak.

October volatility has also raised doubts about a fresh post-election advance. Technology shares have sold off sharply as investors question whether returns from AI will justify heavy spending, while third-quarter earnings have not fully eased those concerns. U.S. equities are also entering the vote at unusually high valuations, with the cyclically adjusted price-to-earnings ratio at 40.7, above the previous midterm high of 33.8 in October 1998, based on Financial Times analysis of Robert Shiller's data.

Our earlier article on the S&P 500’s push toward 8,000 described how a midsummer, AI-led rally was running into a tougher backdrop of higher oil prices, elevated Treasury yields, and uncertainty ahead of November’s midterm elections. It also noted that the market’s strength looked increasingly concentrated in a handful of megacaps, making the index more vulnerable to earnings disappointment and weakening breadth even near record highs.

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