US stocks waver between gains and losses in early trading

The Dow Jones industrial average was up 23 points, or 0.1 percent, at 16,277 as of 9:30 a.m. Eastern time Thursday.

The Standard & Poor's 500 index was little changed at 1,942. The Nasdaq composite edged up six points, or 0.1 percent, to 4,762.

Krispy Kreme Doughnuts plunged 17 percent after the company lowered its outlook following disappointing second-quarter results.