US Stocks Face Bond Yields, Midterms and Earnings Test

US Stocks are entering the fourth quarter of 2026 with the market still close to record highs, but rising bond yields, Federal Reserve policy, corporate earnings and the November midterm elections could challenge the historically strong seasonal performance of the final three months.

The S&P 500 had gained nearly 13% in 2026 as of October 2 and was trading about 1% below its mid-August record high. Investors now face a crowded final stretch of the year, with third-quarter earnings, Federal Reserve communications and the November 3 elections all capable of influencing market direction.

Fourth Quarter Has Historically Been Strong for Stocks

Historical data provides some reason for optimism. Since 1945, the S&P 500 has recorded an average fourth-quarter gain of 4.2%, according to CFRA research. The index has finished the fourth quarter higher in about 85% of those years.

The fourth quarter has also historically performed particularly well during US midterm election years. CFRA data shows that the S&P 500 has averaged a 6.4% gain during fourth quarters of midterm years.

One explanation is that investors can gain greater clarity once the election passes. Markets often dislike political uncertainty, and the removal of uncertainty can allow investors to focus more closely on economic conditions, corporate earnings and monetary policy.

However, historical seasonality does not guarantee another strong quarter. The market enters the final months of 2026 with several significant risks that could challenge the usual fourth-quarter pattern.

S&P 500 Has Already Delivered Strong Gains in 2026

The S&P 500’s nearly 13% gain through October 2 puts 2026 on track to be a strong year for US equities. The index has also remained relatively resilient despite several periods of market volatility.

The deepest decline in the S&P 500 so far this year has been about 9%, according to Wells Fargo Investment Institute strategist Tracie McMillion. Historically, midterm years have experienced considerably larger market declines on average.

That history means investors may be particularly sensitive to any signs that the current rally is losing momentum. After a strong run, expectations for corporate profits and economic growth can become more demanding, leaving stocks vulnerable if incoming data falls short.

Rising Treasury Yields Become a Major Threat

The most immediate concern for investors is the sharp increase in US Treasury yields. The benchmark 10-year Treasury yield reached 5.34% on Thursday, its highest level in 24 years.

Bond yields are closely watched by stock investors because they influence borrowing costs, corporate financing and the relative attractiveness of equities. When government bond yields rise, investors can demand greater returns from stocks, potentially putting pressure on equity valuations.

Higher yields can also increase borrowing costs for households and businesses. Companies planning major investments may face higher financing expenses, while consumers can encounter more expensive loans and credit.

For growth-oriented companies, the impact can be especially important because higher interest rates can reduce the present value investors assign to future earnings.

Why Are Bond Yields Rising?

Several factors are contributing to higher Treasury yields. Investors are weighing expectations for economic growth, elevated energy costs and inflation risks, while companies are also competing for capital as they raise money for large artificial intelligence investments.

Higher energy prices can add to inflation pressures, potentially making it more difficult for the Federal Reserve to ease monetary policy.

At the same time, companies involved in the AI investment cycle are committing significant amounts of capital to data centers, computing infrastructure and other technology projects. Increased corporate borrowing can add to demand for financing and influence broader capital markets.

Federal Reserve Minutes Could Provide Rate Clues

Investors will closely examine the Federal Reserve’s meeting minutes due on Wednesday. The minutes could provide additional information about policymakers’ views on inflation, economic growth and the possibility of another interest-rate increase.

The Federal Reserve raised interest rates in September for the first time in three years as policymakers sought to contain inflation that remained above their target.

Investors had been watching whether another increase could follow in October or December. However, weaker-than-expected employment data reduced expectations for an immediate second consecutive rate hike later in October.

The Fed’s policy path remains particularly important for stocks because changes in interest rates affect both valuations and economic activity.

Midterm Elections Add Another Layer of Uncertainty

The November 3 US midterm elections will determine control of Congress and could influence expectations for economic and regulatory policy.

Investors are likely to watch the contests for both the House of Representatives and Senate because a change in congressional control could affect the prospects for legislation and the administration’s policy agenda.

Market strategist Tracie McMillion said investors are on heightened alert for a possible pullback before election day if the results appear likely to produce a major shift in congressional leadership.

Political uncertainty can affect markets through expectations for taxation, regulation, government spending and other economic policies. However, the precise market reaction will depend on the election results and how investors interpret their potential policy consequences.

Corporate Earnings Season Begins

Another major test for US stocks will come from third-quarter corporate earnings. PepsiCo and Delta Air Lines are among the major companies scheduled to report results in the coming week, with large banks expected to begin the broader earnings season afterward.

Corporate profits have already exceeded elevated expectations during 2026, helping support the stock market rally. That success, however, creates a higher hurdle for companies in the upcoming reporting season.

Analysts expect S&P 500 companies collectively to report third-quarter earnings growth of more than 30% compared with the same period a year earlier, according to LSEG IBES data.

If companies deliver results above expectations and maintain strong forecasts, earnings could provide additional support for equities. Conversely, disappointing results or weaker guidance could make investors question whether current valuations are justified.

AI Spending Is a Critical Market Theme

Artificial intelligence remains one of the most important themes for US stocks. Massive investment by major technology companies has boosted demand for chips, data centers, networking equipment, power infrastructure and other products and services.

The AI investment cycle has also become increasingly important to the earnings outlook for companies beyond the technology sector.

Nelson Yu, head of equities at AllianceBernstein, said the performance of the US stock market has been closely linked to the AI theme. Investors are therefore expected to focus heavily on whether major technology companies are increasing, maintaining or reducing their capital expenditure plans.

Why AI Capital Spending Matters for the Market

Capital expenditure, commonly known as capex, is particularly important because spending plans by the largest AI companies can affect a wide range of businesses.

When hyperscalers increase spending on AI infrastructure, demand can rise for semiconductor equipment, processors, servers, data centers, electricity and related infrastructure. Those companies can then increase their own investments to meet demand.

This creates a chain reaction across multiple industries. A slowdown in AI investment could therefore have effects beyond the technology companies making the original spending decisions.

For the upcoming earnings season, investors will pay close attention to any revisions to AI-related capex forecasts. Stronger spending plans could reinforce confidence in the AI-driven earnings cycle, while reductions could raise concerns about whether some parts of the market have become too dependent on continued AI investment.

Stocks Face a Higher Bar After a Strong Rally

The central challenge for US equities is that investors are entering the final quarter with both strong performance and high expectations.

The S&P 500 has already delivered significant gains in 2026, while analysts expect strong earnings growth. This leaves less room for disappointing economic data, weaker corporate forecasts or an unexpected change in Federal Reserve policy.

At the same time, higher Treasury yields can place pressure on valuations even if corporate profits remain strong. Investors therefore face a balancing act between positive earnings expectations and increasingly challenging financial conditions.

What Investors Will Watch in the Fourth Quarter

Several developments are likely to dominate market attention during the final months of 2026.

• Federal Reserve minutes and future interest-rate decisions.
• The direction of the 10-year Treasury yield.
• Third-quarter corporate earnings and company guidance.
• Capital spending plans by major AI companies.
• The November 3 US midterm election results.
• Energy prices and their impact on inflation.
• Economic growth and employment data.

The interaction between these factors could be more important than any single development. For example, stronger economic growth could support corporate earnings but also keep inflation and Treasury yields elevated, creating a mixed environment for stocks.

Could the Fourth Quarter Rally Continue?

Historical patterns suggest that the fourth quarter can be favorable for US equities, particularly during midterm election years. But seasonal trends are only one factor influencing market performance.

This year’s market enters October after a strong advance, while Treasury yields are at unusually high levels and investors remain focused on inflation and Federal Reserve policy.

If yields stabilize, corporate earnings remain strong and AI investment continues to support profits, stocks could receive several sources of support. On the other hand, a renewed rise in yields, disappointing earnings or significant political uncertainty could increase volatility.

US Stocks Enter a Crucial Final Quarter

The fourth quarter of 2026 is shaping up to be a critical period for US financial markets. Historical data favors stocks during the final three months of the year, and midterm-year fourth quarters have historically been even stronger.

But investors are facing a different set of challenges this time. The 10-year Treasury yield has surged, the Federal Reserve’s policy outlook remains important, corporate earnings expectations are high and the US midterm elections are approaching.

Artificial intelligence adds another major variable. The market’s strong relationship with AI investment means that capital-spending plans from major technology companies could influence not only technology stocks but also a broader group of businesses tied to the AI infrastructure cycle.

With the S&P 500 already up nearly 13% for the year, the final quarter will test whether strong earnings and seasonal trends can outweigh higher borrowing costs, elevated bond yields and political uncertainty.

Frequently Asked Questions

How has the S&P 500 performed in 2026?

The S&P 500 had gained nearly 13% as of October 2, 2026, and was trading about 1% below its mid-August record high.

Is the fourth quarter usually strong for US stocks?

Yes. Since 1945, the S&P 500 has averaged a 4.2% fourth-quarter gain and has risen during the fourth quarter about 85% of the time, according to CFRA.

Why are midterm-year fourth quarters important?

Historically, fourth quarters during US midterm election years have produced an average S&P 500 gain of about 6.4%. Investors may benefit from reduced political uncertainty after the election.

Why are rising Treasury yields a concern for stocks?

Higher yields can make bonds more competitive with stocks, increase borrowing costs and put pressure on equity valuations, particularly for companies whose valuations depend heavily on future earnings.

What will the Federal Reserve minutes show?

The minutes can provide additional insight into policymakers’ discussions about inflation, economic conditions and future interest-rate decisions.

When are the US midterm elections?

The US midterm elections are scheduled for November 3, 2026. The elections will determine control of Congress.

Why is AI spending important for stocks?

Large AI infrastructure investments support demand across semiconductor, data-center, networking, power and other industries. Changes in AI capital spending can therefore affect a broad part of the stock market.

What are investors watching during the fourth quarter?

Investors are likely to focus on Treasury yields, Federal Reserve policy, corporate earnings, AI capital spending, economic data, energy prices and the November midterm elections.