The top pre-market NASDAQ Stock Market gainers are: Sky-mobi, Limelight Networks, Rubicon Technology, Power-One, and Avanir Pharmaceuticals. The top pre-market NASDAQ Stock Market losers are: Obagi Medical Products, USA Technologies, Titan Machinery, priceline.com, and Vodafone Group.

Gainers

Sky-mobi Ltd. (MOBI) stock jumped 6.40 percent to $14.80 in the pre-market trading. UBS Securities initiated coverage of Sky-mobi with a buy rating.

Limelight Networks, Inc. (LLNW) stock grew 5.02 percent to $6.70 in the pre-market trading. The company expects second quarter revenue of $51.8 million to $53.2 million, while Street predicts $51.23 million. The company's first quarter loss widened to $9.8 million or $0.09 per share from $5.8 million or $0.07 per share last year. Adjusted loss for the latest quarter were $3.6 million or $0.03 per share. Revenue grew 38 percent to $49.82 million. Analysts had expected a loss of $0.05 per share on revenue of $49.35 million for the first quarter.

Rubicon Technology, Inc. (RBCN) stock increased 4.69 percent to $29 in the pre-market trading. The company expects second quarter earnings of $0.82 to $0.86 per share and revenue of $40 million to $43 million, while Street predicts profit of $0.68 per share on revenue of $41.09 million. The company reported first quarter earnings of $19.10 million or $0.80 per share, up from $1.58 million or $0.07 per share last year. Revenue grew to $37.97 million from $11.52 million. Analysts had expected profit of $0.66 per share on revenue of $35.97 million for the first quarter.

Power-One Inc. (PWER) stock rose 2.27 percent to $8.11 in the pre-market trading. Profit for the first quarter was $30 million or $0.20 per share, up from $4 million or $0.04 per share last year. Sales grew to $245 million from $152 million. Analysts had expected profit of $0.21 per share on revenue of $241.80 million. For the second quarter, the company expects revenue of $250 million to $270 million, while Street predicts $271.77 million. The company said revenue for the second quarter is expected to be impacted by inverter inventory in the channel, although at lower levels than in the first quarter, and faster growth in the string inverter market in Europe versus ground mount systems.

Avanir Pharmaceuticals (AVNR) stock gained 1.97 percent to $4.14 in the pre-market trading.

Losers

Obagi Medical Products, Inc. (OMPI) stock plunged 27.13 percent to $9.40 in the pre-market trading. The company expects second quarter earnings of $0.15 to $0.17 per share and sales of $26.5 million to $28 million, while Street predicts profit of $0.23 per share on revenue of $30.67 million. For the fiscal 2011, the company lowered its earnings guidance to range of $0.75 to $0.78 per share from previous forecast of $0.87 to $0.91 per share. The company also reduced its 2011 revenue outlook to range of $114 million to $116 million from previous range of $119 million to $122 million. Street analysts predict profit of $0.89 per share on revenue of $120.62 million for fiscal 2011.

The company reported first quarter adjusted earnings of $2.93 million or $0.16 per share, up from $2.33 million or $0.11 per share last year. Sales rose to $26.51 million from $25.71 million. Adjusted sales was $28.44 million. Analysts had expected profit of $0.13 per share on revenue of $27.11 million for the first quarter.

USA Technologies Inc. (USAT) stock tumbled 3.23 percent to $2.40 in the pre-market trading.

Titan Machinery, Inc. (TITN) stock fell 2.46 percent to $29.70 in the pre-market trading. The company said it has priced its offering of 2.4 million common stock at $28.75 per share. The company plans to use the net proceeds for general and administrative expenses and the acquisition of, or investment in, properties, companies, or assets that complement its business. The offering was increased from the previously-announced amount of 2 million shares and the company has granted the underwriters a 30-day option to purchase up to an additional 360,000 shares of common stock at the offering price to cover over-allotments, if any.

priceline.com Inc. (PCLN) stock fell 2.43 percent to $521 in the pre-market trading. Adjusetd profit for the first quarter was 137.0 million or $2.66 per share, up from $87.2 million or $1.70 per share last year. Revenue grew 38.5 percent to $809.3 million. Analysts had expected profit of $2.45 per share on revenue of $779.45 million. For the second quarter, the company expects adjusted earnings of $4.70 to $4.90 per share and revenue growth of about 36 percent to 41 percent, while Street predicts profit of $4.40 per share on revenue of $1 billion with revenue growth of 30.90 percent.

Vodafone Group plc (VOD) stock slid 2.01 percent to $27.37 in the pre-market trading.

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