Benzinga's Top #PreMarket Gainers

Compuware CPWR jumped 16.15% to $10.86. According to the Wall Street Journal, Compuware is in talks to sell itself to a private equity firm. Achillion Pharmaceuticals ACHN shares gained 3.54% to $11.98 in pre-market trading after rising 1.05% on Friday. Staples SPLS shares gained 3.42% to $12.08 in pre-market trading. Credit Suisse upgraded Staples from Market Perform to Outperform. iDreamSky Technology DSKY jumped 2.72% to $21.15 in pre-market trading after dropping 6.79% on Friday. Analysts at Stifel Nicolaus initiated coverage on iDreamSky with a Buy rating.