Thank Big Tech for helping power the S&P 500 to its eighth record high of the year. That dominance could also be the market's biggest vulnerability. Why it matters: Nearly half of the S&P 500's ...

Oppenheimer & Co. Inc. increased its stake in Nvidia by acquiring 10,050 more shares, making it their third-largest holding ...

Remarkably, Nvidia's valuation now exceeds the combined stock market values of several major European economies.

Powell Industries has benefited from AI-driven demand, but margin risks and backlog suggest slower growth ahead. Find out why ...