Benzinga's Top Pre-Market NASDAQ Gainers (ROVI, ASYS, ZAGG, HALO)

Rovi Corporation ROVI shares surged 13.12% to $56.20 in the pre-market session. ROVI reported upbeat Q1 earnings. Amtech Systems Inc ASYS shares advanced 7.09% to $22.67 in the pre-market session. ASYS reported its Q2 net income at $7.5 million, versus a net income of $5.0 million, sequentially. ZAGG Incorporated ZAGG climbed 5.24% to $10.05 in the pre-market session. ZAGG lifted its 2011 sales guidance. Halozyme Therapeutics Inc HALO jumped 4.35% to $6.96 in the pre-market session. Halozyme granted ViroPharma Incorporated VPHM an exclusive worldwide license to use Halozyme's proprietary Enhanze technology. Read more from Benzinga's Markets.