Americans vote on Tuesday, November 3, 2026 in midterm elections that decide who holds the keys to the federal purse for the next two years. Counting will still be under way when European markets open on Wednesday morning. For investors the question is narrower than the politics: can a change of majority in Congress really move markets, or does the effect fade within a few sessions?
The big investment houses answer almost in unison, and their caution deserves to be taken seriously. The vote can spark volatility in the short term, but what drives prices is growth, corporate earnings, investment in artificial intelligence, inflation and interest rates. This round is still harder to read than most, starting with the weight the new Congress will carry on the data center boom and on the 2027 debt ceiling.
What the midterm elections are and how they work
The midterms fall halfway through the four-year presidential term. They do not elect the president, who remains Donald Trump until January 2029. What is renewed is the federal legislature.
All 435 seats in the House of Representatives are up for grabs, since members serve two-year terms, along with 35 of the 100 Senate seats. Thirty-three belong to the class elected in 2020. The other two are special elections in Ohio and Florida, left vacant after JD Vance became vice president and Marco Rubio secretary of state. Voters also choose 36 governors and thousands of local officials the same day.
Republicans start with a majority in both chambers. In the Senate they hold 53 seats to 47 for the Democratic caucus, which includes two independents. Democrats need a net gain of four seats to take control: a gain of three would produce a 50-50 tie, and the deciding vote would fall to Vice President Vance.
In the House, where the majority threshold is 218 seats, Republicans closed 2024 at 220 to 215. Democrats therefore need a net gain of just three seats, a task complicated by the redistricting Republicans pushed through in several states. The new Congress is seated on January 3, 2027.
The stakes for investors are concrete. Congress controls public spending, approves the federal budget and decides on raising the debt ceiling. Whoever wins the House also gains control of investigative committees and the power to subpoena executives and officials. The White House keeps heavy levers of its own: as UBS’s CIO notes, the president retains broad powers over tariffs, foreign policy and regulation, along with veto power. With majorities this thin, major reforms remain unlikely under any scenario.
What polls and prediction markets are saying
American history has an almost iron rule: the president’s party tends to lose seats in midterm elections. The numbers on the eve of this vote point the same way. On regulated prediction markets, where contracts on the outcome are traded, the House is given to the Democrats with probabilities above 90%.
On Kalshi, at 4:45 p.m. New York time on Monday, November 2, 2026 (10:45 p.m. in Italy), a Democratic victory in both chambers was priced at 74%. A divided Congress with a Democratic House and a Republican Senate was at 21%, and a Republican hold across the board at 6%. On Polymarket, between November 1 and November 2, the same Democratic sweep rose from 71% to 78%.
The picture looked very different a few months ago. According to CNBC, at the start of the year, before the US and Israeli strike on Iran in February and the subsequent rise in gasoline prices, the odds of a Democratic double win were around 30%. They passed 50% only in September.
Banks remain more cautious than traders. UBS’s CIO assigns a 50% probability to a fully Democratic Congress, 40% to a divided Congress and 10% to a Republican hold. BNY Investments puts a divided Congress at between 30% and 40%.
The real contest is in the Senate, where Democrats must flip seats in states Trump won in 2024, in some cases by double-digit margins. The races considered decisive are in Texas, Michigan, Maine, Ohio, Iowa, Kansas and South Carolina. In Texas, the race traders watch most closely, Democrat James Talarico is favored against Republican Attorney General Ken Paxton.
When the results arrive (US Eastern and Italian time)
Anyone following the count should plan for a long night. The first polls close at 6 p.m. Eastern time in parts of Indiana and Kentucky, which is midnight in Italy. Successive waves follow until 1 a.m. in New York, when the last polls close in Alaska, at 7 a.m. on Wednesday in Italy. Media projections come in state by state, but they are not official results, which arrive only with certification in the following weeks.
More than one election official has warned that the composition of both chambers is unlikely to be known overnight. The 2022 precedent is not encouraging: the Associated Press did not call the House majority for Republicans until November 16, eight days after the vote.
When the Milan Stock Exchange (Piazza Affari) and the other European bourses open at 9 a.m. Italian time on Wednesday (3 a.m. Eastern), the picture could still be partial, especially for the Senate. Equity markets risk chasing every update of the count.
What market history teaches us about the period after midterms
One figure is circulating among strategists this week: the period after midterm elections has been one of the most generous stretches for US equities. From 1950 to today there have been 19 midterm rounds, and in no case was the S&P 500 lower twelve months after the vote, with an average gain close to 15%. The index series is reconstructed for the years before the benchmark launched in 1957. Looking back as far as 1874, an analysis by Motley Fool based on Robert Shiller’s data finds a rise over the following twelve months in 32 cases out of 38, averaging 14% against 11% for any given twelve-month period.
The usual explanation is that the vote clears away uncertainty, which weighs on markets more than any particular outcome, and that it often produces divided government, which slows legislative activity.
The gains do not arrive immediately. Again according to Motley Fool, in the month after the vote the S&P 500 has posted an average of just 0.5%, finishing positive only 55% of the time. At three and six months the average gains rise to 6% and 10%.
A change of majority has also had limited effects. According to Ned Davis Research, since 1930 the president’s party has lost the House on eight occasions. The S&P 500 rose over the remainder of the year in five of them, with a median gain of 1.4% from election day to the end of December, just below the 1.9% recorded across all midterms.
Morgan Stanley adds a detail that bears directly on the current scenario. Under a Republican president, in the year after the vote the index has gained an average of 23% when Congress was divided and 16% when Democrats controlled both chambers.
Handle these numbers with care. The samples are small, and the best years often coincide with economic recoveries that had little to do with the vote.
Why the 2026 midterms are different
The backdrop to this vote is tenser than the strategists’ caution suggests. According to Reuters calculations, the S&P 500 has gained roughly 27% since Trump returned to the White House in January 2025, driven by billion-dollar investments in artificial intelligence and by earnings growth.
The mood has cooled in recent days. At Monday’s close on November 2, 2026 (4 p.m. Eastern, 10 p.m. in Italy) the index stood at 7,541.40 points, down 0.51%. That was its third consecutive decline and its lowest level since July 31, 3.55% below the record of 7,818.93 points reached on October 6. The Nasdaq ended October down 5.3%, its worst month since March 2025, as doubts grow about the profitability of spending on AI infrastructure.
Bonds tell a similar story. In the same session the 10-year Treasury yield settled at 4.893% and the 30-year at 5.268%, levels fueled by high deficits and by inflation imported through oil. With tensions in the Strait of Hormuz, WTI swung around USD 100 a barrel before falling Monday toward USD 97 on hopes of negotiations with Tehran. The VIX, Wall Street’s fear gauge, climbed back above 20. The vote arrives at a market that is already jittery, and it could ease the pressure or add to it.
The three scenarios and their possible market consequences
Democrats take the majority in both chambers. Prediction markets see this as the most likely outcome, and it is the one the technology sector fears most. With control of Congress, Democrats could launch investigations into big companies and slow deregulation. Ed Mills, economic policy analyst at Raymond James, believes investigations could speed up the introduction of safety standards for the most advanced AI models, independent evaluations and incident reporting requirements, and could make data center builders more accountable. The political ground is fertile: according to a Reuters/Ipsos poll, only one American in three approves of the pace at which new data centers are being built. Reuters has also reported that Democrats are preparing to investigate Trump’s and his family’s ties to the world of cryptocurrencies and prediction markets. On public finances, Diego Barnuevo of Ebury judges this outcome neutral or mildly positive, because negotiations with the White House would be limited to must-pass measures such as the budget and the debt ceiling. Several strategists doubt a Democratic majority would really be more frugal.
A divided Congress, with a Democratic House and a Republican Senate. Wall Street has never minded legislative gridlock too much. «The conventional wisdom is that gridlock is good for stocks», says Ed Clissold, chief US strategist at Ned Davis Research, who believes a Democratic House could temper part of the year-end rally without preventing equities from rising. Gridlock carries its own risks: new federal government shutdowns and standoffs over the debt ceiling, which could add pressure to the US sovereign rating. The dollar could weaken if investors feared repercussions for growth.
Republicans hold both chambers. Prediction markets see this as the least likely outcome, but it would carry the heaviest consequences for government bonds. Joaquín Kritz Lara, chief economist at Numera Analytics, expects new tax cuts or a sharp increase in defense spending in this case, with a further worsening of the deficit. The effect on the greenback would be ambivalent. Karl Schamotta, chief strategist at Corpay, believes a Republican hold would initially support the dollar through higher yields, but would also be read as a green light for new deficit spending, pushing investors to increase currency hedges over time. Artificial intelligence would stand to gain: JPMorgan strategists see in this outcome policy continuity, possible fiscal expansion, deregulation and faster federal permitting for infrastructure.
Sectors under the microscope
The most exposed segment is the one tied to AI and data centers, which carries decisive weight in US indexes. Ariana Salvatore, head of public policy research at Morgan Stanley, believes the vote will not bring restrictive legislation in the immediate term, but could lay the groundwork for action from 2029 onward. The bank’s analysts note that data center REITs and so-called neoclouds would be exposed to proposals for a tax on computing power. UBS urges against dramatizing: many decisions on new facilities are taken at state and local level, and a change of majority in Washington should not halt their expansion.
Defense is another battleground. A Democratic Congress could challenge part of the spending tied to Iran and Israel and push instead for more aid to Ukraine. JPMorgan points to L3Harris, Lockheed Martin and Northrop Grumman among the possible beneficiaries of a Republican hold. Drone companies such as AeroVironment and Kratos have suffered some of the sharpest declines in recent weeks, and a basket of stocks considered close to the Republicans, built by UBS, has lost ground since its August peak, lagging well behind the S&P 500.
A compromise between a Democratic Congress and Trump could emerge on healthcare, according to BNY Investments, particularly on drug price controls, with Democrats pushing to restore funding for public research and for the Affordable Care Act.
For cryptocurrencies the stakes are high in both directions. According to eToro, a Republican majority would make a law clearly dividing oversight between the SEC and the CFTC more likely, while a Democratic Congress would shift attention to consumer protection and illicit flows. On energy, BNY expects a Democratic win to restore some support for solar and wind, with Republicans remaining alongside fossil fuels.
Bonds and the debt ceiling: the 2027 appointment
For US government bonds the date to circle is not November 3 but the spring of 2027. The tax law Trump signed on July 4, 2025, the One Big Beautiful Bill Act, raised the debt ceiling by USD 5 trillion, to USD 41.104 trillion.
According to estimates from the National Taxpayers Union, the remaining headroom had already fallen below USD 1.4 trillion as of August 10, 2026, and the limit would in all likelihood be reached in May 2027, within a window running from February to July. Thanks to the Treasury’s extraordinary measures, the date beyond which the United States would risk failing to meet its obligations, the so-called X-date, would slip to February 2028.
With a wholly or partly Democratic Congress, that deadline becomes the opposition’s main bargaining chip. UBS allows for negotiations that generate volatility and lead to a less severe fiscal tightening than expected. The Swiss bank still forecasts a slight decline in Treasury yields over the next twelve months, convinced that slowing inflation will ultimately weigh more than concerns about public finances.
What can euro-based investors do?
Almost all analysts agree on one point, and it is the least spectacular one. Building a portfolio around a single electoral outcome has rarely paid off. UBS explicitly advises avoiding positioning tied to a single political result and staying diversified across durable sources of growth and income. Long-term investors have little to gain from chasing the most vote-sensitive stocks on counting night.
Euro-based investors face a variable American ones do not: currency. Anyone holding US equity or bond ETFs without currency hedging is exposed to the dollar’s path as well as to securities prices, and the dollar could move in opposite directions across the three scenarios. Shifting part of the portfolio into currency-hedged versions softens that risk, at the cost of an additional expense and of giving up any gains from a stronger dollar. The choice should rest on overall exposure, not on the emotion of an election night.
The calendar matters too. European markets open Wednesday morning with results that are probably incomplete, and in the following days the quarterly reports from the big technology names and the US labor market report due Friday, November 6, 2026 will weigh just as heavily. Anyone planning sizable trades may want to factor in this window of volatility, bearing in mind that the most solid historical evidence concerns the months after the vote rather than the first few sessions. Then comes the turn of US government bonds, with the debt ceiling negotiation in the spring of 2027. Holders of long-dated Treasuries would do well to keep an eye on it from now.
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Editor’s note
This article was originally published in Italian on money.it by Flavia Provenzani on November 03, 2026 as «Elezioni midterm 2026, cosa può cambiare per chi ha azioni e ETF americani in portafoglio?». It has been translated and adapted for an international audience by the Money.it International desk.
