Stock futures were falling on Wednesday, with investors in wait-and-see mode ahead of a key quarterly earnings report from artificial intelligence chip maker Nvidia. Contracts tied to the S&P 500 were also down 0.1% and Nasdaq 100 futures were falling less than 0.1%. Investors appeared reluctant to make any big moves ahead of Nvidia’s results, with the $4.4 trillion semiconductor company set to report after Wednesday’s close.