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US Midterms 2026 Investor Playbook
Neil Wilson
Investor Content Strategist
Note: This is marketing material. This article is not investment advice, capital is at risk.
Key points Democrats are expected to make gains in US Midterm elections but may just fall short of fully recapturing Congress Affordability is the key issue for voters amid soaring energy prices and mortgage rates, while AI has risen in prominence and remains a key driver for market returns Midterm years historically produce weaker returns, but the stock market tends to rally in the year after elections as political uncertainty recedes The US midterm elections in November could see significant change in Washington, with a potential Blue Wave seeing the Democrats wresting control of both the House of Representatives and Senate from the Republicans. Polling data and predictions are leaning towards the Democrat clean sweep, though the GOP looks to be a stronger position to hold the Senate than the House. Results could have important consequences for investors as it will have policy ramifications across several industries. Losing either the House or Senate would make it harder for President Trump to pursue his agenda, though we should note that he would in this case rely even more on executive action, which tends to be market friendly. The S&P 500 is almost flat since June and the choppy action follows a pretty traditional midterm pattern. The years following midterm years are on average the best years for stocks and seasonality could turn supportive for US equities. Since 1946, every midterm election year was followed by positive one-year equity market returns. State of Play A few months ago, the GOP’s grip on the Senate looked unshakable. But Trump’s decision to launch a war against Iran has sent petrol and diesel prices soaring along with mortgage rates. This has turned the election on its head as affordability – cost of living to use a British term – has become central to voters’ decision making. Trump’s approval rating has dived sharply as affordability has worsened. 35 Senate seats are being voted – with the Cook Political Report saying just 12 of these are competitive races, with 7 classed as ‘toss-up’ states. The Republicans hold the upper house 53-47; Democrats need to take 4 seats. Their best chances are in Maine, Ohio and North Carolina, while the GOP has chances in New Hampshire, Michigan and Georgia. Analysis from Citadel suggests the GOP will hold the Senate, but prediction markets are leaning towards the Democrats winning. All 435 seats in the House of Representatives are up for grabs and the lower house is more likely to swing Democrat, at least according to broad national polls and betting markets. Key issues: Affordability and AI AI and the data centre buildout are key themes both for investors and voters in this election cycle. Concerns about the AI buildout among policymakers and communities is bound up with arguments about economic growth, jobs, energy consumption, model alignment, the wider geopolitics of the frontier race with China and the fears about its use ranging from job destruction to wiping out all of humanity. With affordability, Americans are grappling with surging gasoline prices at the pumps while mortgages haven’t been this unaffordable in a quarter of a century. Market Outlook The key question is whether Democrats can wrest full control of Congress from Trump's Republican party. If it were to achieve the sweep it could have policy ramifications that would impact markets. But on the whole, whilst it’s easy to map investment narratives to political outcomes, performance doesn’t usually correlate too much. Broad market context: A Democratic sweep is viewed as the most likely midterm outcome by strategists, polls and betting markets. This would increase Congressional scrutiny in a number of business sectors. A Republican sweep — the least likely scenario — would permit further tax incentives but create upward yield pressure, with equities historically softening in its aftermath. Gridlock has historically been positive for stocks broadly. Historical sector patterns from prior Democratic sweeps (1986, 2006, 2020) and Republican sweeps may not be fully predictive given the current macro backdrop — the AI buildout, oil prices, rates, and tariff dynamics are identified as more powerful near-term equity drivers than the election outcome itself. Since 1930, the S&P 500 has tended to make slow progress in the months leading up to the elections. Annual US stock market returns are, on average, weakest in midterm years. But after a short drawdown as the results are made known and digested, the election acts as a kind of clearing event for risk appetite as political uncertainty recedes. On average, the broad market has rallied 13% in the 12 months after the elections, according to Morgan Stanley. Since 1945, CFRA notes that the S&P 500 averaged an increase of 4.2% in the fourth quarter, but this rises to 6.4% in midterm years. Historical patterns indicate we could see weakness in equity markets related to the midterms running into the 3 November vote before staging a relief rally as political risks subside. Whatever the result, the focus will almost immediately turn to the 2028 presidential race. Democrat Clean Sweep If Democrats take both houses it would curb Trump’s power for the final two years of his administration, though he would still lean on executive actions to drive a lot of his agenda. The biggest shakeup and risk to markets could come from a Democrat-controlled Congress pushing for fiscal, regulatory, and environmental policy changes. It would increase oversight in areas like financial services, crypto and AI. It would also likely see Congress push to investigate Trump and his family, while raising the prospect of another impeachment process – albeit the bar to the Senate voting to convict is high with a requirement for a two-thirds supermajority. A Democrat-controlled Congress could use ‘must-pass’ legislation as leverage to delay One Big Beautiful Bill Act tax cuts, which could negatively impact equities, particularly consumer and healthcare names. Stocks tied to the AI trade could face a tougher regulatory environment under the Blue Wave scenario. There would likely be a greater emphasis on safety of models, while data centre construction could face stricter tests. However, I think the bi-partisan issue of China will remain paramount and therefore do not see a material regulatory headwind. Private equity may face a tougher regulatory environment, particularly in healthcare, while crypto assets will face more acute congressional scrutiny. Gridlock Goldilocks? Very possibly the best thing for stocks could be a divided government, which has historically resulted in the highest equity market gains, averaging an 8.7% increase in the three months following a midterm election, according to Bloomberg data, while a unified government has on average seen marginal losses in equity markets after an election. US Equity Market Returns: Divided Government vs. Single-Party Trifecta Based on S&P 500 annual returns from 1953–2026, mapped against Congressional control configurations, divided government has historically delivered meaningfully stronger equity returns than single-party trifectas. S&P 500 Summary Statistics by Political Configuration Scenario Avg. Annual Return Hit Rate (% positive years) Best Year Worst Year Sample (Years) Divided Government +14.3% 81.3% +52.3% (1954) -37.0% (2008) 48 Single-Party Trifecta +9.6% 73.1% +32.5% (1980) -22.1% (2002) 26 A divided government reduces the chances of major legislative changes, such as raising corporate taxation or regulation, leading to greater policy stability. However, it can also mean budget impasses, debt-ceiling arguments and government shutdown risks. As such divided government raises downside risks to growth and tamps down on yields lowest upside risk to Treasury supply upside. A divided Congress is usually good for bonds because it’s much harder to carry out major fiscal stimulus or sweeping legislation, though this cycle is complicated by concerns about fiscal deficits and inflation. How would AI be impacted by a divided government? The executive branch – the White House - would still be able to advance its agenda because of its control over Federal permitting, land use and directing agency priorities. Companies tied to the AI buildout would continue to current policies that emphasise innovation, infrastructure and beating China. JPMorgan says levered AI bets like Meta, SpaceX, Oracle and CoreWeave would benefit from gridlock. A divided government would likely support areas like Defence, Financials and Industrials, where there is bipartisan support for defence and for boosting US industry. For financials a divided government (vs a Democrat clean sweep) reduces risks of increased oversight, preserves tax incentives and could help cool bond yields. GOP Surprise The least likely scenario...it preserves a majority for Trump’s agenda in Congress and as such represents the biggest upside risk for stocks. Although empirically stocks have tended to do better under a Democrat clean sweep than a Republican, in this cycle it's possible that the dynamic has flipped as Red Wave outcome favours further deregulation and tax incentives, plus looser AI regulation and and looser fiscal policy. This favours financials, tech related to AI buildout, and energy particularly companies involved in grid equipment , power production, and utilities that build new capacity. It would likely benefit digital assets. Congressional Sweep Scenarios: Sector Impact Analysis The following table synthesises sell-side and Bloomberg Research commentary on the equity implications of a Democratic versus Republican congressional sweep across four sectors, ahead of the November 2026 midterm elections. Sector Democratic Sweep Republican Sweep Key Swing Factors Information Technology Increased AI regulation prioritising safety, energy consumption, labour impacts, and community oversight — near-term valuation pressure on AI-exposed stocks likely. More restrictions on new data centre projects; hyperscalers bear greater AI externalities. Greater congressional oversight could generate headline-driven volatility, though fundamentals unlikely to be durably impaired. Investors may be overstating implications for electrical infrastructure demand under this scenario. Accelerated AI development and infrastructure deployment with a less stringent regulatory framework. Preservation and potential expansion of R&D credits, capital-investment incentives, and international tax rules — disproportionately beneficial to US tech. Potential for bipartisan bills to address AI buildout concerns; state/local permitting remains the binding constraint on deployment timing. Surge in M&A activity, particularly in AI, historically associated with Republican congressional control. Fiscal conservatives may seek offsets via reduced R&D incentives or stock-based compensation deductions — a residual risk. IT historically dominates post-midterm performance; sector favours lower policy uncertainty given its global footprint and national security exposure. State and local decisions on permitting, power, water, and zoning are more critical to deployment timing than federal policy. Long-term hyperscale capex outlook largely unchanged across election scenarios. Financials Historically the worst-performing sector under Democratic sweeps: -1.1% relative performance one month post-election, -13.8% at six months. Increased committee oversight of banks expected, with potential for headline volatility. Domestic spending protection prioritised over deregulation; less favourable legislative backdrop for financial services. Anticipated deregulation, tax cuts, and a more lenient approach to mergers viewed as sector tailwinds. Further tax incentives and defence spending; potential reductions in domestic expenditure. Steeper yield curve and deregulation underpin a positive structural outlook. Debt ceiling negotiations under a divided government could expose Medicare Advantage and hospital payments to policy risk — indirect pressure on financial sector counterparties. Republican sweep empirically followed by softer equity markets broadly, despite sector-specific tailwinds. Healthcare Historically the second-worst sector under Democratic sweeps: -3.1% relative performance one month post-election, -17.3% at six months. Democratic control of either chamber would increase scrutiny of confidential drug-pricing deals; Amgen, Pfizer, and other participants face hearings and disclosure demands — headline risk elevated. Pressure for healthcare budget cuts would likely ease if Democrats gain seats — upgrade signal for Health Care Equipment & Services and Pharma/Biotech. Opening for bipartisan efforts to delay or repeal provider-tax changes enacted in the 2025 tax law. PBM reform unlikely to advance before 2027 at the earliest under a gridlocked Congress. Direct hospital reimbursement cuts (site-neutrality, state-directed payments) and new limits on state provider taxes remain high-probability inclusions in any reconciliation bill. Centene and Molina Healthcare most exposed to downside risk from targeted Medicaid spending reductions (both cited by JPM as Blue Wave winners). Healthcare stocks may perform relatively better on ACA/Medicaid dynamics under a Republican sweep. Continuation of prescription drug pricing reforms under scrutiny — mixed signal for large-cap pharma. Divided government reduces risk of spending cuts and gives Democrats scope to seek disclosure of confidential MFN drug deals while pursuing other drug-pricing policies. Chances of bipartisan healthcare legislation are low under a divided Congress — generally viewed as a positive for the coverage universe. Attractive valuation and robust EPS growth support a positive medium-term view regardless of outcome. Energy Focus on renewables, electrification, and grid decarbonization — favourable for clean energy subsectors. Historically, Energy has been among the best-performing sectors in past Democratic sweep years. Democrat sweep considered empirically the best broad equity outcome, reducing policy uncertainty. Permitting reform and greater support for natural gas generation — accelerated project deployment for traditional energy. Less regulated environment; during the Trump 1.0 era, Energy outpaced the broader index by over 10% on deregulation optimism. Potential price volatility amid shifting global production dynamics despite lighter regulation. Financial and energy sectors identified as key opportunities under lighter regulation and lower taxation. Election results influence the timing and composition of infrastructure spending rather than the long-term demand outlook. Oil prices and rates more likely to set the trend for equities than the midterm outcome itself. Administration may shift focus to containing energy price appreciation given its impact on approval ratings — a policy moderating force across scenarios. Fundamentals Over Headlines The rule for investing during an election cycle is to separate political opinions from portfolio management. Electoral anxiety frequently leads to costly behavioural mistakes, such as moving to cash at the wrong time. Market Resilience: Markets have historically advanced over the long term regardless of whether a Democrat or Republican occupies the White House or controls Capitol Hill. The Gridlock Dividend: Wall Street often reacts favourably to a divided government. Gridlock reduces policy uncertainty, making major legislative changes less likely and allowing corporations to plan with greater confidence. Earnings Matter Most: Corporate earnings, macroeconomic indicators (like inflation and employment data), and Federal Reserve monetary policy remain the true drivers of secular bull or bear markets. Guidelines for the Playbook To build a "politics-proof" portfolio, integrate these core operational guidelines into your playbook: 1. Stay Fully Invested Avoid Market Timing: Trying to time the market around election night is statistically a losing strategy. Missing just a few of the market's best recovery days can permanently degrade long-term compounding. Historical Post-Election Rallies: Historically, the S&P 500 has shown a strong tendency to rally in the 12 months after a midterm election. This is largely because the market hates uncertainty; once the votes are cast and the outcome is known, the market can reprice risk accurately. 2. Filter Out Headline Noise Short-Term Volatility is Normal: Expect elevated market swings in the weeks leading up to the vote. Treat this volatility as background noise rather than a signal to restructure core asset allocations. 3. Maintain Robust Diversification Avoid Sector Over-Betting: Do not over-index your portfolio on specific sectors based purely on predicted election outcomes (e.g., dumping green energy or hoarding defence stocks). Policy implementation takes months or years, and market forces often override political intentions. Rebalance Mechanically: Stick to a systematic, rules-based rebalancing schedule to trim winning assets and buy underperforming ones, removing human emotion entirely from the process. Golden Rule: Time in the market beats timing the market. An election is a temporary political event, but wealth accumulation is a multi-decade economic process. Keep your eyes on the fundamentals, tune out the noise, and let your diversified asset allocation do its job.
Three modern midterm elections produced a House party-control flip, each occurring against a very different rate regime. The common thread is that the curve's near-term reaction was driven far more by the prevailing macro backdrop than by the election outcome itself — divided government was broadly anticipated in each case, limiting the electoral surprise.
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