J.C. Penney, which is in the early stages of a multiyear turnaround, reported a 26 percent decline in third-quarter sales at stores open at least a year, a steeper drop than the 17.9 percent that Wall Street analysts were expecting.

Penney said its net loss had narrowed to $123 million, or 56 cents per share, in the third quarter ended Oct. 27 from $143 million, or 67 cents per share, a year earlier.