"NEW YORK (MarketWatch) -- J.C. Penney Co. JCP +5.64% shares rose 4.7% on Friday after hedge fund manager David Tepper's Appaloosa Management said in a regulatory filing it bought 737,800 shares of J.C. Penney shares, valued at $6.5 million. The struggling retailer, in the midst of an attempted turnaround, is a hot debate among bull and bear investors."