Wall Street indexes climb amid earnings optimism; Nvidia gains

U.S. stock markets advanced on Tuesday afternoon as strong gains in Nvidia helped lift sentiment and investors turned their attention to upcoming earnings from major tech firms. Shares of Nvidia rose more than 4% after announcing a new contract with the U.S. Department of Energy. The rally reflects optimism around artificial-intelligence driven hardware demand and corporate earnings strength, even as some macro risks persist. Broader indexes rose despite mixed sectoral performance, underscoring the dominant role of AI-cloud stocks in the current market cycle.