The S&P 500 gained 7.7% through early June 2026, marking a strong midyear performance driven by massive artificial intelligence investments and record corporate earnings. The index’s resilience through geopolitical tensions and market volatility underscores investor confidence in the long-term earnings power of U.S. equities, making this an inflection point for those considering stock market exposure.
By the end of the first half, the S&P 500 had climbed nearly 9.5% for the year, its strongest first-half showing since 2024’s 14.5% surge, according to Reuters. The rally carried the index above 7,600 for the first time in history, as reported by Hightower Advisors on June 15.
AI infrastructure spending has been the primary engine of gains. Goldman Sachs reported in May that AI infrastructure investment is expected to account for roughly half of the S&P 500’s 2026 earnings growth, with the firm projecting full-year earnings per share of $340—a 24% increase year-over-year. First-quarter earnings for S&P 500 companies grew 28.6%, the strongest quarterly growth in a decade, with 83% of companies beating expectations, according to analysis from May 2026.
The concentration of gains in mega-cap tech remains notable. Just three AI hyperscalers—Alphabet, Amazon, and Meta—account for 70% of S&P 500 earnings growth expectations for 2026, per Yahoo Finance reporting in May. Micron and Nvidia alone are expected to drive 31% of the index’s earnings growth, according to Bailard in late June.
Historical patterns suggest the rally may have room to run. The Motley Fool reported that when the S&P 500 enters June up 7.7%, as it did in 2026, the median second-half return in prior years with similar positioning was 12.7%. This marks the 16th time in history such a setup has occurred since 1950.
Wall Street forecasts support continued gains. Goldman Sachs raised its year-end 2026 S&P 500 target to 8,000 in late May, up from 7,600, projecting a 6% return from those May levels. Forbes reported in mid-June that Wall Street expects the index to rise 5% more by year-end, though historical analysis suggests such forecasts are often too conservative. Kiplinger noted that analysts are targeting average earnings per share of $331 for S&P 500 companies in 2026, compared with $271 in 2025—a gain of more than 20%.
For investors evaluating stock market exposure, the combination of strong earnings growth, AI-driven capital expenditures by major corporations, and historically favorable seasonal patterns for years with strong first halves suggests the fundamentals remain supportive. However, geopolitical risks, inflation concerns, and elevated valuations remain headwinds that analysts continue to monitor as the market heads into the second half.
Sources
- Reuters — S&P 500 first-half 2026 performance and historical comparison to 2024
- Hightower Advisors — S&P 500 surpassing 7,600 for the first time
- Goldman Sachs — AI infrastructure accounting for 50% of earnings growth, earnings projections, and year-end 2026 forecast
- myfindex.com — Q1 2026 earnings growth of 28.6% and beat rate
- Yahoo Finance — Three AI hyperscalers accounting for 70% of earnings growth expectations
- Bailard — Micron and Nvidia driving 31% of S&P 500 earnings growth
- The Motley Fool — Historical pattern of 12.7% median second-half return when S&P 500 enters June up 7.7%
- Forbes — Wall Street expectation of 5% additional gain by year-end 2026
- Kiplinger — Analyst targets for 2026 S&P 500 earnings per share
