Benzinga's Top #PreMarket Gainers

XenoPort, Inc. XNPT shares rose 8.32 percent to $7.29 in pre-market trading after the company reported positive Phase 2 study results for XP23829 as a potential treatment for patients with psoriasis. DBV Technologies SA - ADR DBVT shares jumped 3.09 percent to $38.75 in pre-market trading. Analysts at Morgan Stanley initiated coverage of DBV Technologies with a Overweight rating. GoPro Inc GPRO gained 1.73 percent to $33.45 in pre-market trading after rising 1.42 percent on Monday. Ambarella Inc AMBA shares rose 1.68 percent to $67.95 in pre-market trading after surging 3.76 percent on Monday. Grifols SA, Barcelona GRFS shares climbed 0.65 percent to $32.34 in pre-market trading. Grifols shares have dropped 13.09 percent over the past 52 weeks, while the S&P 500 index has declined 2.30 percent in the same period.