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Portfolio construction

US large-cap outlook: Strong earnings and AI scrutiny

September 22, 2026 - 3 min

Strong second-quarter results continue to support US large caps, but investors may need to become more selective as markets look for evidence that artificial intelligence (AI) spending can produce durable returns.

Key takeaways

  • Second-quarter earnings results continue to support an overweight position in US large-cap equities.
  • Hyperscaler valuations have declined as investors question whether heavy AI spending can generate sufficient returns.
  • A more selective approach may help investors distinguish between companies making productive AI investments and those still working to prove the payoff.

Strong earnings support US large caps

The fundamental backdrop for US large-cap equities remains strong. With most of the S&P 500® having reported second-quarter results, the year-over-year blended earnings growth rate exceeded 50%. The positive earnings surprise rate reached 86%, compared with 78% over the past five years and 77% over the past 10 years.

The strength was also broad based. Ten of the 11 S&P 500® sectors reported positive earnings surprise rates above their longer-term averages. Those results reinforce our overweight positioning in US large caps and suggest that corporate fundamentals remain supportive despite an uncertain market environment.

AI spending faces a higher bar

Strong earnings have not lifted every part of the market equally. Investors have responded cautiously to results from several hyperscalers, including Meta, Alphabet, and Oracle. Forward valuation premiums for some of these companies have narrowed, bringing them closer to the broader S&P 500®.

This repricing does not necessarily signal an end to the AI growth story. Rather, it suggests that investors are becoming more demanding. Companies may increasingly need to demonstrate that their AI investments can support lasting earnings growth and generate returns above their cost of capital.

This environment may reward selectivity rather than broad exposure to the entire hyperscaler group. The strongest opportunities could emerge among companies that can convert elevated spending into measurable and durable business results.

Risks could limit the market’s response

Several risks could complicate the outlook. The 10-year Treasury yield recently registered a two-standard-deviation move higher, which has historically served as a warning sign for equities. Credit spreads are also near cycle tights, leaving less room to absorb a shift in investor sentiment.

Geopolitical tensions in the Middle East and the seasonal effects associated with US midterm elections add further uncertainty. These conditions have not yet pointed to a negative growth event, but they may help explain why companies beating earnings expectations have not always received the market response they might have in a more supportive environment.

Selectivity may define the next phase

Evidence is beginning to suggest that parts of the AI build-out are producing returns above their cost of capital. Meanwhile, increased investor scrutiny has lowered valuations across portions of the hyperscaler market.

That combination may create opportunities for investors willing to distinguish between companies with demonstrated AI-related returns and those whose spending has yet to produce a clear payoff. Strong large-cap fundamentals remain supportive, but the next phase of the market may depend less on owning the entire AI cohort and more on identifying the companies best positioned to turn investment into sustained earnings growth.

Put portfolio insights into practice

Our Portfolio analysis & consulting team provides objective, risk-based analysis, research, and insights to support portfolio construction and asset allocation.

The information, data, analyses, and opinions presented herein are for informational purposes only. This material is not intended to be a recommendation or investment advice; does not constitute a solicitation to buy, sell or hold a security or an investment strategy; and is not provided in a fiduciary capacity. The information provided does not take into account the specific objectives or circumstances of any particular investor or suggest any specific course of action. Investment decisions should be made based on an investor’s objectives and circumstances, and in consultation with his or her financial professionals.

All investing involves risk, including the risk of loss. There is no guarantee the Fund’s investment objective will be achieved.

The average large-cap fund has outperformed the S&P 500 index over the past year, driven by strong stock selection and sector allocation.

Diversification does not guarantee a profit or protect against a loss.

Earnings Per Share (EPS)

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