The top pre-market NASDAQ stock market gainers are: Rubicon Technology, China XD Plastics, China MediaExpress Holdings, NutriSystem, and Drugstore.com. The top pre-market NASDAQ stock market losers are: Anadigics, NetApp, eHealth, EnerNOC, and NVIDIA.

Gainers

Rubicon Technology, Inc. (RBCN) stock jumped 18.43 percent to $25 in the pre-market trading, as its first quarter earnings guidance topped Street view. The company expects first quarter earnings of 62 cents to 65 cents a share and revenue of $34 million to $36 million, while Street predicts profit of 52 cents a share on revenue of $31.30 million.

The company posted fourth quarter profit of $15.3 million or 64 cents a share, compared to a loss of $0.76 million or 4 cents a share last year. Revenue grew 44 percent to $29.5 million. Analysts had expected profit of 50 cents a share on revenue of $26.79 million.

Shares of China XD Plastics Company Ltd. (CXDC) climbed 9.77 percent to $7.30 in the pre-market session.

China MediaExpress Holdings, Inc. (CCME) stock gained 9.57 percent to $13.86 in the pre-market trading. Bernstein Liebhard announced filing of a lawsuit in the United States District Court for the Southern District of New York on behalf of a class of investors who purchased China MediaExpress securities between the period of November 8, 2010 through February 3, 2011, inclusive. Plaintiffs allege China MediaExpress violated the Securities Exchange Act of 1934.

NutriSystem Inc. (NTRI) stock rose 6.55 percent to $20.82 in the pre-market session.

Shares of Drugstore.com Inc. (DSCM) increased 4.57 percent to $2.06 in the pre-market trading. The company expects first quarter sales of $123 million to $126 million, while Street predicts $124.86 million. The company projects fiscal 2011 net sales of $515 million to $530 million, while Street analysts predict $529.59 million. For fiscal 2013, Drugstore.com expects annual revenue of over $750 million and net income of $15 million.

Losers

Anadigics, Inc. (ANAD) stock fell 8.27 percent to $5.99 in the pre-market trading. The company expects first quarter adjusted loss of 7 cents to 8 cents a share and revenue of $42 million to $44 million, while Street predicts profit of 4 cents a share on revenue of $55.47 million. Adjusted profit for the fourth quarter was $4.89 million or 7 cents a share, compared to a loss of $3.21 million or 5 cents a share last year. Sales rose to $60.23 million from $41.81 million. Analysts had expected profit of 6 cents a share on revenue of $58.02 million.

Shares of NetApp, Inc. (NTAP) lost 7.93 percent to $53.90 in the pre-market session, as it guided fourth quarter earnings below Street view. The company expects fourth quarter adjusted profit of 49 cents to 53 cents a share and revenue of about $1.38 billion, plus or minus 2 percent, which equates to about 15 percent to 20 percent year over year revenue growth. Street predicts profit of 54 cents a share on revenue of $1.38 billion.

NetApp posted third quarter adjusted earnings of $210.6 million or 52 cents a share, up from $143.8 million or 40 cents a share last year. Revenue rose to $1.27 billion from $1.01 billion. Analysts had expected profit of 50 cents a share on revenue of $1.28 billion.

Shares of eHealth, Inc. (EHTH) tumbled 7.56 percent to $10.76 in the pre-market session. The company expects full year 2011 earnings of $0.31 to $0.40 a share and revenue of $141 million to $149 million, while Street predicts profit of $0.57 a share on revenue of $160.57 million. Adjusted profit for the fourth quarter was $6.5 million or $0.28 per share, compared to $5.1 million or $0.21 per share last year. Revenue rose 47 percent to $50.7 million. Analysts had expected profit of 19 cents a share on revenue of $43.62 million.

EnerNOC, Inc. (ENOC) stock declined 3.52 percent to $18.62 in the pre-market trading. The company expects first quarter adjusted loss of 64 cents to 84 cents a share and revenue of $25 million to $31 million, while Street predicts loss of 55 cents a share on revenue of $37.04 million. The company projects full year 2011 adjusted profit of $0.97 to $1.23 a share and revenue of $300 million to $320 million, while Street predicts profit of $0.68 a share on revenue of $326.36 million.

Loss for the fourth quarter widened to $21.17 million or 86 cents a share from $15.20 million or 64 cents a share last year. Adjusted loss widened to $17.14 million ot 69 cents a share from $11.89 million or 50 cents a share last year. Revenue fell to $22.69 million from $26.73 million. Analysts had expected a loss of 83 cents a share on revenue of $22.98 million.

NVIDIA Corp. (NVDA) stock decreased 2.61 percent to $22.77 in the pre-market session. The company expects first quarter revenue growth of 6 percent to 8 percent sequentially. The company posted fourth quarter adjusted profit of $139.0 million or 23 cents a share, compared to $131.1 million or 23 cents a share last year. Revenue fell 10 percent to $886.38 million. Analysts had expected profit of 21 cents a share on revenue of $894.55 million.

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