US stock index futures close higher Monday: S&P 500 up 0.7%, Nasdaq 100 up 1.18%

The tech-heavy Nasdaq 100's outperformance relative to the Dow and Russell 2000 signals that risk appetite is concentrated in large-cap growth rather than broadening across the market. That narrow leadership matters for anyone tracking whether equity strength has real breadth behind it. The modest Russell 2000 gain, meanwhile, suggests smaller-cap participation remains muted. Whether this growth-led pattern persists into the next session is the open question worth watching.