S&P 500 Earnings Depend on AI Infrastructure Doing the Heavy Lifting

The S&P 500 is tracking its strongest quarter since Q2 2020, up over 14%, with Q2 earnings growth projected between 23% and 30% according to Investing.com. The rally hinges on a narrow base: technology stocks, led by NVIDIA and Micron, are expected to deliver 60% of the index's total EPS growth.

AI infrastructure and memory chip makers are doing the heavy lifting. The concentration risk is stark—if these sectors stumble, the broader index lacks diversification to absorb the impact. Profit margin expansion across other sectors will need to materialize to sustain momentum beyond the current tech-driven surge.

The 60% contribution from technology represents an unusually top-heavy earnings profile for the S&P 500, heightening sensitivity to any disappointment from mega-cap tech names. NVIDIA's data center demand and Micron's memory pricing power will be critical variables as Q2 earnings season approaches.