Nvidia Corp. faces the final test of an earnings season-driven rally that has sent its shares up about 45% from an April low.The world’s most valuable chipmaker reports Wednesday after market close — the last of the Big Tech cohort to do so.

U.S. stocks opened slightly higher as investors await artificial intelligence chip darling Nvidia's earnings after the bell. The broad S&P 500 index rose 0.1% to open near 5,927, up about 6 points. The Dow Jones Industrial Average added 13 points to trade near 42,