The top pre-market NASDAQ stock market gainers are: LTX-Credence, Exelixis, DryShips, Dendreon, Aruba Networks, SodaStream International, Pan American Silver, Spreadtrum Communications, NetApp, and Canadian Solar.

LTX-Credence Corp. (LTXC) grew 38.80 percent to $8.30 in the pre-market trading. The company and Verigy (VRGY) announced definitive merger agreement to take advantage of similar portfolios and increase their market share. The merged entity, to be called Verigy, is expected to realize $25 million in annual savings.

Exelixis, Inc. (EXEL) surged 21.82 percent to $5.75 in the pre-market session. The company posted promising interim data from patients with ovarian cancer treated With XL184 in an ongoing phase 2 adaptive randomized discontinuation trial. 32 percent confirmed response rate per response evaluation criteria in solid tumors in patients with platinum-resistant or platinum-sensitive disease.

Exelixis also reported promising interim data from patients with castration-resistant prostate cancer treated with XL184 in an ongoing phase 2 adaptive randomized discontinuation trial. 19 of 20 patients (95 percent) achieve complete or partial resolution of lesions on bone scan by independent review.

DryShips, Inc. (DRYS) jumped 9.44 percent to $5.68 in the pre-market session. The company's third quarter adjusted profit was $99 million or 38 cents a share. Revenue rose to $225.5 million from $222.3 million. Analysts had expected profit of 25 cents a share on revenue of $216.92 million.

Dendreon Corp. (DNDN) soared 8.28 percent to $38.84 in the pre-market trading. Medicare Evidence Development & Coverage Advisory Committee backed the company's Provenge prostate cancer therapy, helping the U.S. government decide whether to pay for its $93,000 prostate cancer treatment.

Aruba Networks, Inc. (ARUN) improved 6.00 percent to $22.60 in the pre-market trading. The company's first quarter adjusted profit was $13.9 million or 12 cents a share, up from $4.1 million or 4 cents a share last year. Revenue rose 44 percent to $83.1 million. Analysts had expected profit of 11 cents a share on revenue of $80.98 million.

SodaStream International Ltd. (SODA) rose 5.93 percent to $32.67 in the pre-market session.

Pan American Silver Corp. (PAAS) increased 4.26 percent to $37.20 in the pre-market trading.

Spreadtrum Communications Inc. (SPRD) grew 4.17 percent to $16 in the pre-market trading. The company's third quarter profit was $19.5 million or 37 cents per ADS, up from $0.6 million or 1 cent per ADS last year. Revenue rose 34.7 percent to $96.2 million. Analysts had expected profit of 33 cents a share on revenue of $92.58 million. Spreadtrum expects fourth quarter revenue of $118 million to $125 million, while analysts forecast $102.64 million.

NetApp, Inc. (NTAP) rose 4.06 percent to $51.25 in the pre-market session. The company's second quarter adjusted profit was $203 million or 52 cents a share, up from $130 million or 37 cents a share last year. Revenue rose 33 percent to $1.21 billion. Analysts had expected profit of 49 cents a share on revenue of $1.19 billion.

NetApp expects third quarter adjusted earnings of 48 cents to 50 cents a share and revenue of $1.24 billion to $1.29 billion. Analysts expect profit of 51 cents a share on revenue of $1.26 billion.

Canadian Solar Inc. (CSIQ) moved up 3.70 percent to $13.75 in the pre-market trading. The company's third quarter profit was $20.3 million or 47 cents a share, down from $25.3 million or 69 cents a share last year. Revenue rose to $377.2 million from $213.1 million. Analysts had expected profit of 43 cents a share on revenue of $347.47 million.

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