aug 26 reuters  the sp 500 and nasdaq opened slightly lower on thursday as mixed earnings reports and economic data kept investors on the edge ahead of the federal reserves jackson hole policy summit the dow jones industrial average dji rose 442 points or 012 at the open to 3544968 the sp 500 spx fell 24 points or 005 to 449375​ while the nasdaq composite ixic dropped 167 points or 011 to 15025166 at the opening bell reporting by sruthi shankar in bengaluru editing by shailesh kuber