Nvidia's rise helped the S&P 500 reach its 31st record close of the year, with Nvidia becoming America's most valuable listed company at USD3.34 trillion. The S&P 500's information-technology sector marked an eighth-straight gain, aided by the artificial intelligence boom. Despite mixed economic signals and cautious remarks from Federal Reserve officials, investors bet on future rate cuts, boosting both bond prices and stock performance. Nvidia's 3.5% gain led the chip sector, while oil stocks like Exxon Mobil and Chevron also saw gains, driven by rising crude prices and Berkshire Hathaway's investment in Occidental Petroleum.