The short answer: Extremely important. With valuations elevated, earnings may be one of the most important factors in whether the current bull market can sustain its momentum. Early third-quarter 2026 results are encouraging, with S&P 500 earnings on track for roughly 29% year-over-year growth as of October 16, according to FactSet. But the market needs more than strong numbers. It needs evidence that profit growth is sustainable, broadening beyond a handful of AI leaders, and backed by confident 2027 guidance (management’s own forecasts for the year ahead).
Investors are looking for proof that corporate America can keep growing profits despite the pressures of interest rates, inflation, labor costs and elevated stock valuations. This earnings season is where that proof either shows up or doesn’t.
Here is my view: when valuations are high, companies have less room for disappointment. Strong earnings can justify higher stock prices. Disappointing results can trigger meaningful corrections, even while the broader economy continues to grow.
Key takeaways
S&P 500 third-quarter earnings were tracking about 29% year-over-year growth as of October 16, with revenue up 12.6%.
84% of early reporters beat estimates, but by only 2.6% in aggregate, below historical averages.
Growth is concentrated: excluding NVIDIA and Meta, the rest of the Magnificent Seven were expected to grow earnings just 7.5%.
Management guidance for 2027 may matter more than this quarter’s results.
I favor selectivity: durable profitability, healthy balance sheets, strong free cash flow and defensible valuations.
The three questions every investor should be asking
Are profits growing fast enough to support current valuations?
Are companies delivering results above expectations?
Are management teams confident enough to raise their earnings forecasts for 2027? Perhaps the most important of the three.
What do the latest earnings numbers tell us?
The early results are encouraging, but there is an important distinction between profits that are strong and profits that are strong enough to support higher stock prices.
According to FactSet’s October 16 update, the S&P 500 was on track for approximately 29% year-over-year earnings growth for the third quarter. Of the 9% of companies that had reported by then, 84% had exceeded earnings-per-share estimates. However, those companies’ earnings were only 2.6% above expectations in aggregate, below the five- and ten-year averages.
Third-quarter 2026 earnings snapshot
Projected S&P 500 earnings growth (year over year) 29.0%
Projected revenue growth (year over year) 12.6%
Companies beating EPS estimates (of the 9% that had reported) 84%
Aggregate earnings surprise (below historical averages) +2.6%
Source: FactSet, October 16, 2026. These are preliminary blended estimates, not final results for all S&P 500 companies.
Why does this matter? Because the stock market responds not only to whether companies beat estimates, but to how much they beat them by, what management says about future earnings, and whether investors had already priced in the good news.
Four factors that will determine how the market reacts
1. Artificial intelligence and technology profits
Technology remains central to the earnings outlook. FactSet estimates third-quarter earnings growth of 33.2% for the Magnificent Seven (Apple, Microsoft, Alphabet, Amazon, NVIDIA, Meta and Tesla), compared with 27.7% for the other 493 S&P 500 companies. However, NVIDIA and Meta are expected to account for much of that group’s growth. Excluding those two, the other five are estimated to grow earnings by just 7.5%.
That concentration creates a vulnerability. If AI-related revenue and profits keep exceeding expectations, technology stocks could help lift the broader market. If investors begin to question the returns on enormous AI infrastructure spending, even companies reporting impressive profits could see their share prices fall.
2. Profit margins and inflation
Revenue growth is encouraging, but companies also need to preserve their margins. Higher wages, energy costs, financing expenses and other operating costs can erode profitability even when sales remain strong.
If businesses can pass higher costs on to customers while maintaining demand, earnings can continue to expand. If consumers become more price-sensitive, companies may have to absorb those costs or accept slower sales growth.
3. Interest rates and Treasury yields
Strong earnings can help offset the pressure elevated interest rates put on stock valuations. But if inflation stays persistent and Treasury yields rise, investors may be less willing to pay high price-to-earnings multiples (what investors pay for each dollar of earnings) for future growth.
This is particularly important for technology and other growth stocks, whose valuations depend heavily on profits expected years into the future.
4. Management guidance for 2027
In my judgment, this may be the most important factor of all. Investors need credible evidence that earnings growth can continue into 2027, rather than simply comparing this quarter with a favorable year-ago period.
Management teams that raise forecasts and demonstrate real returns on investment are likely to be rewarded. Companies that beat third-quarter estimates but lower their forward guidance may be punished.
Three scenarios for U.S. stocks from here
Bullish
Earnings beat expectations, AI investments translate into measurable revenue and cash flow, and companies raise their 2027 forecasts. This could support another leg higher in U.S. equities, potentially broadening gains beyond the largest technology companies.
Base case
Profits remain strong, but results largely meet elevated expectations. Stocks trade unevenly as investors distinguish between attractive valuations, sustainable earnings growth, and companies whose share prices already reflect optimistic assumptions.
Bearish
Earnings disappoint, 2027 guidance weakens, or rising Treasury yields compress valuations. AI-related stocks could be particularly vulnerable if investors question the returns on capital invested in data centers, chips and related infrastructure.
The immediate risk is that the market’s earnings expectations are high just as borrowing costs are becoming a greater concern. Recent reporting has highlighted the tension between strong technology-sector profits and rising Treasury yields.
What I am watching most closely
Meta and other major technology companies: evidence that AI spending is producing incremental profits, not simply higher capital expenditures.
Semiconductor companies: forward revenue guidance, order growth and the sustainability of AI-related demand.
Consumer-facing businesses: whether households can keep supporting revenue growth amid persistent living costs.
Treasury yields and profit margins: whether higher financing and operating costs begin to undermine the earnings outlook.
What this means for your portfolio
I would rate corporate profits as a critical driver of U.S. equity performance this earnings season. The market is looking for more than impressive year-over-year comparisons. It needs evidence that earnings growth is sustainable, increasingly broad-based, and capable of supporting current valuations.
For portfolio positioning, I would remain selective rather than assume that strong aggregate earnings guarantee further gains. I would favor businesses with durable profitability, healthy balance sheets, strong free cash flow and defensible valuations. I would also pay close attention to diversification, since earnings growth concentrated in a handful of AI-related companies creates additional index-level risk.
The key question is not simply whether corporate profits are growing. It is whether those profits can grow fast enough to justify the prices investors are paying for stocks today.
Frequently asked questions
Why do earnings matter more when valuations are high?
When stocks are priced for strong growth, there is less room for disappointment. Strong earnings can justify higher prices, while results that merely meet expectations, or miss them, can trigger meaningful corrections.
How strong are third-quarter 2026 earnings?
As of FactSet’s October 16 update, S&P 500 earnings were on track for about 29% year-over-year growth, with revenue up 12.6%. Of early reporters, 84% beat EPS estimates, though by only 2.6% in aggregate.
Is S&P 500 earnings growth concentrated in AI stocks?
Largely, yes. FactSet estimated 33.2% earnings growth for the Magnificent Seven versus 27.7% for the other 493 companies. Excluding NVIDIA and Meta, the remaining five were expected to grow earnings just 7.5%.
What matters more: this quarter’s results or 2027 guidance?
In my view, guidance. Companies that beat estimates but lower forward forecasts may be punished, while those that raise forecasts and show real returns on investment are likely to be rewarded.
How should investors position portfolios during earnings season?
I would remain selective, favoring businesses with durable profitability, healthy balance sheets, strong free cash flow and defensible valuations, and pay close attention to diversification given how concentrated earnings growth has become.
Disclaimer: This article is provided for informational and educational purposes only and does not constitute investment, tax, or legal advice, or a recommendation to buy or sell any security. The views expressed are those of the author as of the date noted and are subject to change without notice. Figures cited are drawn from third-party sources believed to be reliable but are not guaranteed. Past performance is not indicative of future results, and all investing involves risk, including the possible loss of principal. Hypothetical scenarios are illustrative only and are not forecasts. Please consult a qualified financial professional regarding your individual circumstances.