Record-high optimism drives S&P 500 earnings estimates to 29.5% growth

Key points

• Analysts raised S&P 500 earnings estimates by 1.4% from June 30 to September 30, defying the historical trend of downward revisions during the quarter.
• The index is expected to achieve 12.3% year-over-year revenue growth, continuing a streak of double-digit revenue growth for three consecutive quarters.
• All eleven S&P 500 sectors are projected to report year-over-year earnings growth, with Energy, Information Technology, Communication Services, and Materials leading in double-digit expansion.
• The forward 12-month P/E ratio stands at 19.0, which is below the five-year average of 19.8 and the 10-year average of 19.1, suggesting valuations remain reasonable despite high growth expectations.
• Goldman Sachs attributes the strong earnings outlook primarily to sustained spending on artificial intelligence infrastructure and services.

Background

This optimism follows a period of mixed performance in late 2026, where AI-driven gains in companies like Snowflake and Meta's new product launches coexisted with volatility in other sectors. Earlier in September, investors watched bond yields ease and oil prices climb, while midterm political gridlock was predicted to potentially spark a stock rally by reducing policy uncertainty. The current earnings preview builds on this backdrop of AI-centric growth and stable macroeconomic conditions.

How outlets are covering it

FactSet emphasizes the statistical anomaly of upward earnings revisions during the quarter, noting that 62% of companies issued positive EPS guidance, well above the 5-year average of 40%. Goldman Sachs, as reported by Seeking Alpha, focuses on the causal driver, identifying AI spending as the primary engine for the strong earnings season. While FactSet highlights the breadth of growth across all sectors, Goldman Sachs points to specific technology and infrastructure investments as the key differentiator. Both sources agree on the bullish sentiment but differ in their emphasis on the underlying drivers.

Why it matters

The record-high bullishness among analysts signals a shift in market sentiment from caution to confidence. With earnings growth expected to exceed 25% for the third straight quarter, investors may see continued support for equity markets, particularly in sectors benefiting from AI adoption. The reasonable valuation metrics suggest that the market is pricing in growth without excessive froth, potentially allowing for sustained gains into the fourth quarter.

What to watch

Investors will watch the first S&P 500 companies reporting results in the coming week to gauge whether the optimistic estimates translate into actual performance. The focus will be on whether AI-related spending continues to drive revenue growth and if the positive guidance from companies holds up against actual results. Additionally, the market will monitor how the 29.5% earnings growth rate compares to the 27.6% projected for Q4 2026 and 32.4% for the full year 2026.