Powerful tremors are expected to hit Wall Street as a result of the US midterm elections. Investors find themselves confronting a complex backdrop of uncertainty, as the prospect of a Democratic takeover in Congress generates fresh concerns regarding technology companies, artificial intelligence investments, the defense industry, and banks. Simultaneously, an even more unpredictable factor hovers over the markets: Donald Trump's stance toward Iran and the prospect of resuming military operations. Such a scenario could ignite a fresh surge in oil prices and upend expectations for the customary post-election stock market rally.
The outcome has not been priced in
According to investment firms and analysts, the stock market has not yet priced in a Democratic takeover of Congress, despite the fact that certain polls and most prediction markets point in that direction. Consequently, such an outcome could exert downward pressure on share prices on Wednesday (11/4/2026). Conversely, if Republicans manage to retain control, a short-term relief stock rally could materialize. Beyond short-term movements, the usual post-midterm tendency points upward over the subsequent months. However, some question whether the market might deviate from this positive historical trend this time, given that the S&P 500 index has already recorded a significant advance during the year prior to the elections. Regarding specific stocks under the microscope, a major Democratic victory on Tuesday night, particularly in the Texas gubernatorial race, could intensify pressures on artificial intelligence (AI) stocks due to assessments that restrictions on data center construction and operation would gain national momentum. Defense stocks could similarly face pressure due to fears surrounding spending limitations. Polls indicate Democrats are heading toward victory in the House of Representatives, while the Senate race remains toss-up territory. Prediction markets, however, appear more favorable toward Democrats, estimating they may prevail in both chambers of Congress.
Investors remain cautious
Although investors appear to reluctantly accept a Democratic takeover as the baseline scenario, they have not adjusted their investment positions accordingly, stated Tobin Marcus of Wolfe Research. Recent survey data from the firm, involving more than 100 institutional investors, indicates they have not positioned themselves heavily in favor of any specific electoral outcome. "Investors appear to maintain significant reservations as to whether the final outcome will prove as favorable for Democrats as polls suggest," Marcus told CNBC, pointing out that the firm shares the view that polls may overestimate Democratic strength. JP Morgan estimates that a "blue wave"—meaning Democratic control of both chambers of Congress—could trigger a drop of roughly 0.5% in the S&P 500 on Wednesday. Conversely, if Republicans manage to retain control of both chambers, this could ignite a stock rally, stated Sameer Samana of the Wells Fargo Investment Institute. "From a standpoint of certainty, the market knows how to react when Republicans maintain control of both chambers," he noted. Citigroup equity strategists stated on Monday that a development wherein Republicans lose the House but retain the Senate could function as an "upside catalyst" for equities through year-end. JP Morgan traders forecast a rise of up to 1% on Wednesday if Republicans manage to hold onto Senate control.
What history shows
Beyond short-term movements, equities tend to record gains following the completion of midterm elections. Indeed, the S&P 500 has registered gains one year after every single midterm election held since the early 1980s. However, the S&P 500 has already recorded double-digit gains during 2026, prompting concerns among certain Wall Street analysts that investors appear overly complacent ahead of this year's elections. During midterm election years, the S&P 500 has historically recorded an average drop of 14% at some point during the second half of the year, according to Jonathan Krinsky of BTIG. "The reason stocks often perform well in November during midterms is that they typically exhibit weakness BEFORE the elections. This year, however, we have the opposite backdrop," Krinsky wrote last week. "Therefore, while the prevailing view is that a post-midterm rally will follow, we consider the opposite scenario actually more probable".
AI concerns meet the ballot box
The situation is compounded by the fact that the broader market has recently sustained significant pressures owing to turmoil surrounding artificial intelligence investments. This drove the Nasdaq Composite index to record its worst daily performance on Friday since June. AI-linked stocks pushed the market lower again on Monday. A strong Democratic electoral performance in Tuesday's midterms could intensify pressures on these specific equities even further. At the state level, strengthened Democratic control is likely to prove a negative factor for companies connected to data centers and capital expenditure tech equipment, according to analysts. "This would cement early warning signs appearing across various states regarding the expansion of AI infrastructure," stated Rob Rains of Washington Analysis. Goldman Sachs equity strategists reported this week that a Congress under Democratic control "could curtail tax incentives for data centers, though a national moratorium appears unlikely regardless of the electoral outcome". A characteristic example is Texas, which constitutes a major hub for data center development. An unexpected defeat there for Republican Governor Greg Abbott possesses the potential to trigger short-term market disruption, according to Wolfe Research's Marcus.
Defense and healthcare stocks
A "blue wave" could exert downward pressure on defense stocks while potentially favoring the healthcare sector, according to analysts and investors. "A significant Democratic victory could limit real growth in government spending, unless a broader agreement is achieved that increases both defense and healthcare funding," stated Alex Sagal, global equity analyst at the Wells Fargo Investment Institute. Nevertheless, he noted that profit outlooks for the defense industry appear "stable to moderately positive". Wolfe Research's Marcus stated that the healthcare sector will constitute "the largest area of focus," as Democrats will seek to reinstate expired enhanced Affordable Care Act premium subsidies or overturn certain Medicaid reforms included in the One Big Beautiful Bill Act. "Healthcare stocks have performed very well lately," Jed Ellerbroek of Argent Capital Management told CNBC. "I believe part of this development stems from investors rotating away from AI stocks, but I also consider part of it stems from optimism that Democrats are taking control". Ellerbroek closely monitors hospital-operator stocks such as HCA Healthcare and Tenet Healthcare, as well as health insurers like UnitedHealth and Centene.
Are pressures coming for banks?
The financial sector was the worst-performing sector in the S&P 500 in early 2026 following President Donald Trump's call for Congress to approve legislation capping credit card interest rates at 10%. Although the sector subsequently managed to recover, with its year-to-date gains now hovering around 3%, the situation could turn more volatile for financial firms under Democratic control. "Democrats will take action seeking to display tangible results on the issue of affordability. This means they will target sectors positioned at the center of household budgets," stated Matthew Aks of Evercore ISI. "We know Trump possesses populist instincts and tendencies. Could he select certain issues and decide to cooperate with Democrats on them, targeting specific sectors with a populist approach? Absolutely". Given that Democratic congressional control is frequently linked to heightened regulatory intervention, while Republican control is deemed favorable to deregulation, Democrats could show interest in advancing a credit card interest rate cap if they prevail in the elections. "I believe if Democrats gain control of one or both chambers, they will attempt to pass relevant legislation and see whether Trump signs it or is forced to issue a veto. This would allow Democrats to reap political benefit," Aks stated.
The wild card of Iran
Trump could restart war against Iran after previously avoiding major military strikes ahead of the midterm elections. Such a development could totally upend market sentiment and lead to an outperformance of energy stocks. Crude oil prices advanced by over 10% in October, although they gave back a significant portion of those gains on Monday. The average price of gasoline in the US stood at $4.17 per gallon on Sunday, registering an increase of nearly 50% compared to the corresponding period last year, according to the American Automobile Association (AAA). "If escalation occurs, this could obviously exert upward pressure on prices right before Thanksgiving," stated Patrick De Haan, head petroleum analyst at GasBuddy. "This also represents a period during which Americans maintain very strong traditions and driving habits to visit friends and relatives". If Trump decides to proceed with robust military action, it could eradicate expectations for the usual year-end stock rally observed following midterm elections. Evercore ISI estimates that the S&P 500 could drop by a double-digit percentage and close the year at 6,800 points if oil prices spike, should the US president "proceed with military escalation in Iran prior to the swearing-in of the new Congress in January" and Democrats assume control of Congress.
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