NEW YORK — The U.S. stock market is pulling back from another all-time high.

The Standard & Poor’s 500 index lost six points, or 0.3 percent, to 1,944 shortly after the market opened Tuesday. The S&P 500, the most widely used benchmark for mutual funds, finished at another record high on Monday.

The Dow Jones industrial average is down 40 points, or 0.2 percent, to 16,903 while the Nasdaq gave up 12 points, or 0.3 percent, to 4,323.

RadioShack slumped 8 percent after the retailer posted a wider loss than analysts had expected. Sales also fell.

MetLife rose after announcing plans to buy up to $1 billion of its own stock.