Stock market today: Nvidia keeps flying and helps keep Wall Street near its records

NEW YORK (AP) — Nvidia, the chip company that's become Wall Street's most influential stock, is rising again and helping to keep U.S. indexes around their record highs despite a mixed set of reports on the economy. The S&P 500 was up 0.1% in early trading Thursday after setting an all-time high for the 31st time this year before Wednesday's holiday. The Dow Jones Industrial Average was little changed, and the Nasdaq composite was up 0.2%. Nvidia rose 3% after supplanting Microsoft Tuesday as the most valuable company on Wall Street. Darden Restaurants rose 1.4% after delivering profits that edged…