Here are the best-performing stocks so far in 2015 By: MarketWatch January 09, 2015 at 11:47 AM EST Retailers bounce back after reporting strong holiday sales, writes Phil van Doorn. Read More >> Related Stocks: Akorn Inc Boston Scientific Dick's Sporting Goods Inc Ebix Inc J C Penney Company Inc Merck & Co Papa John's Intl Pfizer Repligen Corp Sonic Cp