September got off to a quiet start on Wall Street as stocks ended narrowly mixed after a day of wavering between gains and losses, the AP reports. Utilities and financial stocks ended lower Thursday, but technology and materials companies managed modest gains. Among individual stocks, Campbell Soup sank 6% after reporting results that fell short of analysts' forecasts. Hewlett Packard Enterprises rose 3%. The Dow Jones industrial average edged up 18 points, or 0.1%, to 18,419. The Standard & Poor's 500 index fell a fraction to 2,170. The Nasdaq composite rose 14 points, or 0.3%, to 5,227. More stocks fell than rose on the New York Stock Exchange. (More Dow Jones stories.)