Political shift, but limited market regime change from US midterms

The 2026 U.S. midterm elections have delivered a decisive shift in Washington. While a handful of races remain uncalled, Democrats have secured control of both the Senate and House of Representatives, with gains that appear considerably larger than markets had anticipated.

The result materially strengthens Democrats’ ability to constrain the Trump Administration during its final two years, including through control of congressional committees, investigations, nominations, and the legislative agenda. 

It does not, however, necessarily imply a wholesale reversal of existing policy. President Trump's veto authority, together with the administration’s considerable executive discretion over areas such as trade, means that divided government is more likely to produce gridlock than a sharp change in policy direction.

Indeed, President Trump has already emphasised the importance of his veto power, posting an image of a red “VETO” hat on Truth Social following the election. With Democrats lacking the two-thirds majorities required in both the House and the Senate to override a presidential veto, there will be limits to their ability to translate electoral gains into major legislative change. 

At the same time, the President’s indication that he ultimately expects to negotiate with Democrats suggests that bipartisan agreements may still be possible in selected areas.

For investors, that distinction is important. The election changes the political balance of power, but the implications for the economic and market outlook are more nuanced.

Market reaction: relief as uncertainty clears

The initial market reaction has been broadly constructive, despite some overnight volatility.

• Equities: S&P 500 and Nasdaq 100 futures initially sold off as the scale of the Democratic victory became apparent and investors contemplated the possibility of a contested result. Markets subsequently recovered as those concerns diminished and the political outlook became clearer.
• Rates: Treasury yields have edged lower, consistent with expectations that divided government will constrain the scope for additional fiscal expansion. Investors should resist extrapolating that move too far. With government debt already elevated, inflation pressures persistent and economic growth resilient, the fundamental backdrop still points toward structurally elevated interest rates.
• Oil: Brent crude prices have moved back near $90 per barrel, although developments in the Middle East appear as important as the election result itself.

More broadly, the equity response reinforces a familiar lesson from previous midterms: markets tend to care more about the removal of political uncertainty than about which party wins.

Historically, the period following midterm elections has generally been constructive for U.S. equities. But there are considerable variations beneath that headline. Weaker post-election returns have typically coincided with economic or market shocks, while the strongest periods have occurred against a backdrop of healthy growth and earnings.

That is the more relevant message for investors today. Once election uncertainty fades, attention should quickly return to the forces that were driving markets beforehand: the durability and returns of the AI investment cycle, the fiscal trajectory, inflation and Fed policy, interest rates and, ultimately, corporate earnings. 

Unless the election generates a meaningful change in those fundamentals, it is unlikely to determine the medium-term direction of markets.

Policy implications

1. Fiscal policy: gridlock reduces upside risk to spending, but does not solve the debt problem

A Democrat majority in Congress makes another major fiscal expansion considerably less likely. In isolation, that is a modest positive for Treasuries and helps explain the initial decline in yields.

However, the election does little to change the underlying fiscal arithmetic. Large existing deficits, elevated government debt, persistent inflationary pressures, and resilient growth were already significant constraints on further stimulus. Therefore, gridlock reduces the risk of another fiscal impulse, but it does not create fiscal consolidation. As a result, we would not interpret the initial decline in Treasury yields as the beginning of a sustained, policy-driven move lower in rates.

2. Data centres: Gubernatorial races increase local scrutiny

The rapid expansion of data centres emerged as an issue in several state and gubernatorial races, as concerns about power availability, electricity costs, water usage, and local infrastructure increasingly entered the political debate. That makes the state-level results particularly relevant to the sector, given the important role that state and local authorities play in permitting, infrastructure, and development decisions.

Increasingly, the debate is not simply about whether more data centres are needed, but how quickly they can be built and powered, where they can be located and who should bear the infrastructure costs associated with their growth. Significant Democratic victories in gubernatorial races will bring greater scrutiny of new development and potentially, in some jurisdictions, tougher requirements or temporary pauses.

Requirements for developers to fund additional grid investment, meet tougher resource standards or forgo tax incentives could raise development costs and slow new supply. For investors, that could increase the value of existing infrastructure that is already powered, permitted, and operational.

Europe offers a potential precedent, in which restrictions have increasingly led developers and communities to negotiate how data centres can expand while addressing local costs and concerns. Given the importance of AI investment to U.S. growth, a similar push toward tighter conditions and greater negotiation seems more plausible than a broad halt to development.

The outlook remains highly uncertain and will vary considerably by state. As policies take shape, the implications for development pipelines, existing assets, and valuations will become clearer.

Investment considerations

The U.S. midterms represented a substantial political rebuke of the Trump administration, but their immediate market implications are less dramatic than the scale of the election result might suggest.

The most important macro consequence is gridlock: less scope for additional fiscal expansion, but little immediate change to the existing tariff regime, debt burden or inflation backdrop. With political uncertainty clearing, attention should quickly return to the fundamentals that drove markets before the election: growth, inflation, Fed policy, the AI investment cycle and corporate earnings.

In the end, the election may matter most for what Washington can no longer do, rather than for what markets need to rethink.