Summertime settled into Wall Street on Friday as major stock indexes drifted slightly higher going into the weekend. The listless day of trading left the stock market with a tiny loss for the week, its second this month. A handful of corporate results drove trading in some big names. Warnings of weaker earnings pushed DuPont down, while stronger results pushed Nike up. But the overall market was essentially flat. The Dow Jones industrial average rose 5.71 points, less than 0.1 percent, to close at 16,851.84. The Standard & Poor's 500 index rose 3.74 points, or 0.2 percent, to 1,960.96. The Nasdaq composite index rose 18.88 points, or 0.4 percent, to 4,397.93. For the week: The Dow fell 95.24 points, or 0.6 percent. The S&P 500 fell 1.91 points, or 0.1 percent. The Nasdaq rose 29.89 points, or 0.7 percent. For the year: The Dow is up 275.18 points, or 1.7 percent. The S&P 500 index is up 112.60 points, or 6.1 percent. The Nasdaq is up 221.34 points, or 5.3 percent.