US Tech Megacaps Lead Wall Street Higher As AI Infrastructure Deal Flow Reprices Leadership Premium

Wall Street closed mixed, but the Magnificent Seven cohort advanced sharply as investors priced second order impact from the $38 billion AWS–OpenAI cloud infrastructure deal, which reinforced expectations that hyperscale AI infrastructure owners will keep widening competitive spread vs traditional tech. Amazon and Nvidia led index contribution gains, while S&P 500 breadth remained negative with most non-AI sectors declining. Oil traded steady as OPEC+ maintained a production pause, limiting commodity volatility transmission. Capital rotation into AI adjacency continues to define near term U.S. equity momentum path and pricing frameworks.