Amazon's stock price increased over 8%
Stocks closed lower Friday to cap a volatile week that finished with losses after Fitch downgraded its U.S. credit rating below the top AAA level, which launched U.S. Treasury yields on a wild ride. Friday marked the final day of the busiest week in the second quarter earnings season, with Amazon jumping more than 8% to its highest in nearly a year following a strong beat and raise, while Apple fell nearly 5% after reporting lower revenue than the year-earlier quarter.