U.S. stocks opened higher on July 31, with the Dow Jones Industrial Average up 0.45%, the Nasdaq up 0.94%, and the S&P 500 up 0.53%, according to Jiemian News. Apple fell more than 8% after its Q4 revenue guidance came in below expectations. Amazon rose more than 12% after its Q2 cloud business revenue beat expectations, while Novo Nordisk fell more than 8% after it released the latest progress in its ZEUS phase III clinical trial.