NEW YORK (AP) -- Stocks are opening lower on Wall Street, putting the market on track for its first weekly loss after four weeks of gains.

The Dow Jones industrial average was down 42 points at 15,251 shortly after the opening bell Friday, a loss of 0.3 percent.

The Standard & Poor's 500 index was down seven points at 1,642, or 0.5 percent. The Nasdaq composite fell 16 points to 3,443, or 0.5 percent.

The market is headed for its first weekly loss in five weeks. The S&P is still up 15 percent so far this year.

Sears posted a big loss late Thursday. Its stock plunged 17 percent, or $10, to $48.28.