Top strategists at JPMorgan and Goldman Sachs observe early signs that US earnings growth is spreading beyond the mega-cap tech stocks driving the AI boom. This shift suggests a potential broadening market rally, reducing reliance on a narrow group of companies that have dominated recent market gains.

For months, the market's health has been judged by a handful of tech giants. A wider earnings base could signal more sustainable growth for the S&P 500, offering opportunities in sectors like industrials and financials that have lagged behind. This matters for portfolio diversification.

Investors should watch upcoming quarterly reports for confirmation. If more companies beat estimates, it could bolster confidence in the broader market's strength. The key question is whether this trend can sustain itself beyond the current earnings season.