US Midterms 2026: What the Election Could Mean for Markets

• Party control has historically explained little about overall US stock market performance. 
• Politically sensitive sectors such as energy, healthcare and tech can see rotation after a change in Congress. 
• Midterm years are often choppy into the autumn, with markets tending to rally once the result is known. 
• Gridlock is a common outcome, and markets have often welcomed it. 
• Past patterns are not a trading strategy, especially with today’s macro backdrop.

Not in any consistent way. Looking back over past midterms, what happens in Washington afterwards has had little overall effect on US stock market performance. The big drivers remain the fundamentals: earnings, growth, jobs, inflation and the path of interest rates. 

That’s worth remembering as the noise builds over the coming days. A change in who runs Congress rarely changes the direction of the wider market on its own. 

Where midterms can make a difference is at the sector level. There have been times when politically sensitive areas such as energy, healthcare and technology have faced different levels of scrutiny after a change in control of Congress. That can trigger a period of sector rotation rather than the whole market moving one way. 

It’s also worth remembering that rotation is happening all the time under normal market conditions. Overvalued stocks get sold and undervalued ones get bought. Growth and momentum plays can outperform value and dividend payers for a while, and then the reverse. But that happens regardless of the result of a midterm election. 

So, party control explains little. Yet the election calendar itself does seem to influence market behaviour, even if the winner doesn’t. Midterm years can often be choppy through late summer and early autumn, before a rally once the result is known. 

Since the Second World War, the S&P 500 has been higher 12 months after every midterm election. And there’s no denying there has been a degree of chop in the run-up to this year’s vote. 

But this is necessarily a small sample. The simplest explanation for the pattern, if it really exists, is that there’s always uncertainty ahead of an election, and investors tend to react positively once it clears. 

Any historic pattern shouldn’t be used as a trading strategy on its own. That’s especially true now. The global economy is dealing with two major wars: the conflict with Iran, which has disrupted Middle East oil supplies and kept Brent crude above $100 a barrel, and the ongoing war in Ukraine. Add to that a borrowing boom to fund the build-out of AI infrastructure, uncertainty over inflation and interest rates, and now a wave of civil unrest across Europe, with cost-of-living and student protests spreading from France to Italy, Spain, Portugal and Albania. 

A look at past midterms shows that political gridlock is a common outcome, and it often goes down well with financial markets. The president’s party usually loses seats. A split government is seen as limiting what an administration can push through, and in the current political environment that could be significant. 

Ahead of the 3 November vote, prediction markets see a Democratic sweep of both the House and Senate as the most likely outcome, with a Republican Senate and Democratic House the next most likely. Either result would leave Congress at odds with the White House. 

That would be both a persistent annoyance and something of a constraint for President Trump as he heads towards the last two years of his second term. But it won’t affect his ability to issue executive orders, steer much of trade and foreign policy, or direct federal agencies. 

In short, the same things that mattered before the vote: 

• Earnings and economic data, which have historically driven stocks far more than election results. 
• Inflation and interest rates, and what they mean for the Federal Reserve’s next moves. 
• Sector moves in energy, healthcare and tech if the balance of power shifts. 
• Volatility around the result as uncertainty clears, rather than a lasting change in market direction. 

The outcome of these midterms is unlikely to have a significant effect on financial markets. But there’s still plenty for traders to consider as they look towards the year-end.