Slower S&P 500 earnings growth could put pressure on stock valuations if share prices already assume rapid profit gains—but it would not, by itself, prove the index is overvalued or that prices must fall. There is also an important qualification to the premise: FactSet’s October 2, 2026 forecast projected continued rapid growth, including 29.5% year-over-year growth for Q3, rather than a slowdown. Those figures were estimates, not final reported results.
What the latest S&P 500 earnings forecast showed
FactSet’s October 2, 2026 earnings preview projected 29.5% year-over-year earnings growth for S&P 500 companies in Q3 2026, up from 26.7% at the start of the quarter. Analysts’ Q3 estimates had risen 1.4% between June 30 and September 30, whereas estimates are usually lowered during a quarter. FactSet Vice President and Senior Earnings Analyst John Butters wrote: “In a typical quarter, analysts usually lower earnings estimates during the quarter.” FactSet’s October 2 preview reported both the estimate revisions and Butters’s comment.
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The same preview projected 27.6% year-over-year growth for Q4 2026 and 32.4% growth for calendar-year 2026. These are analyst forecasts published before Q3 results were complete; they can change as companies report and issue guidance. They should not be read as realized earnings growth.
FactSet’s October preview said all eleven sectors were expected to grow, although only five were projected to post double-digit growth. An index-wide growth rate therefore does not mean every sector or company is growing at the same pace.
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How slower earnings growth can affect valuations
Earnings growth and valuation are related, but they are not the same measure. Growth describes how quickly company profits are increasing. A valuation multiple describes how much investors are willing to pay for those profits. The market reaction to slower growth depends in part on what investors had already priced in.
When slower growth could weigh on prices
If stock prices reflect expectations of continued rapid profit growth, a slower outlook can disappoint investors. They may mark down expected future earnings, pay a lower multiple for each dollar of expected earnings, or do both. That can put downward pressure on share prices, but it is not automatic: a slower rate of growth can still mean earnings are rising, and the market response depends on how new information compares with prior expectations.
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Why a growth slowdown does not settle whether stocks are overvalued
A slower growth rate alone does not show that the index is overvalued. That judgment also depends on the price investors are paying, the earnings expected at that price, and other influences on the multiple. The Federal Reserve defines forward price-to-earnings (P/E) as equity prices relative to expected earnings over the next 12 months. It is an estimate-based valuation measure, not a direct forecast of investment returns.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →In its November 2025 Financial Stability Report, the Federal Reserve said its forward P/E measure remained well above its historical median and its estimate of the equity premium remained well below its historical median. Those are observations from November 2025, not readings for October 2026.
Put the forward P/E in dated context
FactSet’s October 2, 2026 preview put the S&P 500’s forward 12-month P/E at 19.0. In that same snapshot, the multiple was below FactSet’s five-year average of 19.8 and its ten-year average of 19.1. In FactSet’s earlier July 24, 2026 update, the forward multiple was 20.1, above that report’s ten-year average of 19.0. These are separate dated snapshots, not a continuous series or a timeless assessment of the market.
The July report also illustrates why an index-level earnings figure can be sensitive to large constituents. FactSet’s blended Q2 2026 earnings-growth rate was 37.9%; excluding Alphabet, it would have been 25.9%. The blended rate combined reported results with estimates for companies that had not yet reported. FactSet’s July 24 update provides that comparison.
Interest rates can influence the multiple as well
Investors weigh earnings expectations alongside the return available from other assets and the risks they perceive. In a September 21, 2026 analysis, State Street Global Advisors reported that the S&P 500 forward multiple had moved from roughly 23 times earnings to approximately 19 times over the prior year as real yields rose. This is an attributed account of a period, not a universal rule that rising yields always produce a particular valuation change.
State Street describes total returns as reflecting both earnings growth and changes in valuation multiples. Its analysis is useful for separating those two drivers: even if earnings forecasts hold up, a falling multiple can reduce returns; conversely, a rising multiple can support prices even when earnings growth is less rapid. Read State Street Global Advisors’ September 21 analysis.
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A practical way to assess a slowdown
- Separate reported results from forecasts. Check which companies have reported and which figures remain consensus estimates. Treat a blended rate as provisional when it includes companies that have not reported.
- Look at estimate revisions. Determine whether forecasts are being raised or cut over the period being discussed. A growth forecast and the direction of revisions answer different questions.
- Compare like-for-like P/E snapshots. Use a dated forward P/E and historical averages from the same provider, rather than combining different providers’ snapshots or treating an older multiple as current.
- Consider yields and the multiple together. A change in expected earnings is only one possible driver of valuation; real yields and changes in the P/E multiple can also affect prices.
- Check where index growth is coming from. Sector and large-company contributions can materially affect the headline rate, as FactSet’s Q2 comparison excluding Alphabet demonstrates.
For this specific outlook, FactSet’s October 2 forecast indicated strong projected growth and upward Q3 estimate revisions, not a broad earnings-growth slowdown. The figures still describe expectations, so subsequent reports and revisions determine whether that outlook is borne out.
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