S&P 500 Q3 Profit Growth Forecast at 30% on Surging Tech Revisions and AI Capex

Corporate earnings season for the third quarter begins this week against a backdrop of record equity index highs and strong profit forecasts. According to consensus estimates compiled by FactSet and reported by CNBC Business , Wall Street analysts project aggregate S&P 500 earnings to grow by nearly 30% year over year, up from a 26.7% forecast recorded on June 30.

The technology sector, representing approximately 40% of the S&P 500's total index weighting, accounts for the bulk of the upward revisions. FactSet data shows projected earnings-per-share growth for tech firms climbed to 65% from 57% at the end of June, supported by upward revisions for semiconductor makers Nvidia and Micron Technology following strong demand for AI hardware. Consumer-facing technology developments, including Meta Platforms' rollout of its Muse shopping agent, have also intensified commercial activity in AI-enabled e-commerce.

Earnings momentum is also showing signs of broadening beyond the Magnificent Seven mega-cap technology companies. Projections from Russell Investments indicate the remaining 493 stocks in the S&P 500 are expected to generate 27% year-over-year profit gains, outpacing the 20% average growth projected for the top seven firms. Down the capitalization spectrum, Yardeni Research estimates S&P 400 MidCap operating earnings will increase 19% in 2026, while S&P 600 SmallCap earnings are forecast to grow 21% this year and 16% in 2027.

Despite headline earnings strength, underlying market participation has narrowed significantly. Data from Morgan Stanley shows that only 20% of S&P 500 equities were trading above their 50-day moving average at the end of September, down from 70% in midsummer. Nearly 38% of the 504 index components sit 20% or more below their 52-week highs, with companies including Oracle, AppLovin, Coinbase Global, CoStar Group, and Boston Scientific down by at least 50%. Furthermore, FactSet reports eight sectors have received downward EPS revisions since June 30, led by materials (-10.2%), consumer staples (-4%), and healthcare (-3.3%).

Macroeconomic conditions present an additional constraint on equity valuations. The 10-year Treasury yield recently touched a 24-year high above 5.36%, rising from 4.75% in August amid persistent inflation, with August core personal consumption expenditures (PCE) inflation recorded at 3%. While Bank of America notes the S&P 500 forward price-to-earnings ratio stands near 19 times, the index screens as expensive on 17 of 20 historical valuation metrics. Initial insight into how higher borrowing costs are affecting corporate lending, advisory pipelines, and capital markets will arrive on October 13, when JPMorgan Chase, Goldman Sachs, Citigroup, and Wells Fargo report third-quarter financial results.