Appaloosa's David Tepper sees 8-10% upside in 2015 By: CNBC.com News December 29, 2014 at 14:23 PM EST Billionaire hedge fund manager David Tepper says the S&P 500 is "fairly valued" but that it could rise another 8 to 10 percent from here. Read More >> Related Stocks: Sentinelone Inc Cl A