FILE - In this Oct. 8, 2014 file photo, a man walks to work on Wall Street, near the New York Stock Exchange, in New York. Global stocks were mixed on Friday, July 31, 2015, with China's stock market extending losses, after data showed the U.S. economy posted solid growth during the second quarter. (AP Photo/Mark Lennihan, File)NEW YORK (AP) — Stocks closed modestly lower Friday as oil titans Exxon Mobil and Chevron led a slump in energy stocks.