The top after-market NASDAQ Stock Market gainers are: Web.com Group, On Assignment, Zipcar, Allied Motion Technologies, Savient Pharmaceuticals, and The Andersons. The top after-market NASDAQ Stock Market losers are: Dendreon, Entropic Communications, comScore, Zumiez, Oncothyreon, and Career Education.

Gainers

Web.com Group, Inc. (WWWW) stock jumped 32.79 percent to $11.50 in the after-market trading. Adjusted profit for the second quarter was $8.08 million or $0.26 per share, up from $3.26 million or $0.13 per share last year. Revenue grew 70 percent to $42.24 million, while adjusted revenue rose to $46.19 million from $24.78 million. Analysts had expected profit of $0.24 per share on revenue of $45.67 million.

Separately, Web.com said it agreed to buy Network Solutions, currently majority owned by private equity firm General Atlantic LLC. Web.com will pay Network Solutions $405 million in cash and issue 18 million shares of Web.com common stock, in addition to refinancing existing net debt of Network Solutions and paying certain fees. The transaction, subject to Web.com shareholder approval and other closing conditions, is expected to be completed in the fall of 2011.

On Assignment Inc. (ASGN) stock climbed 14.87 percent to $11.59 in the after-market trading. Profit for the second quarter was $5.87 million or $0.16 per share, up from $940,000 or $0.03 per share last year. Revenue rose to $143.68 million from $104.46 million. Analysts had expected profit of $0.13 per share on revenue of $142.79 million. Looking ahead into third quarter, the company expects earnings of $0.17 to $0.19 per share and revenue of $155 million to $158 million, while Street predicts profit of $0.14 per share on revenue of $148.20 million.

Zipcar, Inc. (ZIP) stock advanced 14.85 percent to $26.52 in the after-market trading. Loss for the second quarter was $5.57 million or $0.17 per share, compared to a loss of $5.23 million or $0.95 per share last year. Revenue grew 34 percent to $61.6 million. Analysts had expected a loss of $0.23 per share on revenue of $59.45 million. Looking ahead into the third quarter, the company expects loss of $1.5 million to break-even and revenue of $67 million to $69 million, while Street predicts revenue of $66.26 million. For the full year 2011, the company now expects loss of $11 million to $14 million and revenue of $240 million to $244 million, while Street predicts revenue of $238.27 million.

Allied Motion Technologies Inc. (AMOT) stock surged 14.15 percent to $6.05 in the after-market trading. Profit for the second quarter was $1.48 million or $0.17 per share, up from $739,000 or $0.09 per share last year. Revenue rose to $28.86 million from $20.0 million.

Savient Pharmaceuticals, Inc. (SVNT) stock soared to 10.71 percent to $7.13 in the after-market trading.

The Andersons, Inc. (ANDE) stock grew 10.39 percent to $42.49 in the after-market trading. Profit for the second quarter was $45.2 million or $2.42 per share, higher than last year's $25.2 million or $1.36 per share. Revenue grew to $1.34 billion from $811 million. Analysts had expected profit of $1.72 per share on revenue of $1.15 billion.

Losers

Dendreon Corp. (DNDN) stock plunged 62.44 percent to $13.46 in the after-market trading. Loss for the second quarter narrowed to $114.59 million or $0.79 per share from $142.62 million or $1.04 per share last year. Adjusted loss narrowed to $83.54 million or $0.57 per share from $130.51 million or $0.96 per share. Revenue grew to $49.56 million from $2.81 million. Analysts had expected a loss of $0.71 per share on revenue of $58.58 million. Looking ahead, the company said the recent positive reimbursement changes are anticipated to have a significant impact. It also expects to reduce expenses, including workforce reductions, to align with its near-term manufacturing requirements.

The company scrapped sales forecast for its prostate cancer drug Provenge, and said it expects modest quarter-over-quarter revenue growth for the remainder of this year. It cited the delay in adoption of the new positive reimbursement changes for withdrawing its revenue forecast of $350 million to $400 million for the full-year 2011.

"We believe the market potential for Provenge is substantial, and the primary issue affecting the dynamics of our launch is the reimbursement knowledge around Provenge. We anticipate the positive National Coverage Determination (NCD) and Q-code will have a significant impact on increased physician adoption," President and CEO Mitchell Gold said in a statement.

"However, we believe this will take time, and for the remainder of 2011, the launch trajectory will reflect a more gradual adoption of Provenge as physicians gain confidence in this positive reimbursement landscape."

Entropic Communications, Inc. (ENTR) stock plummeted 22.16 percent to $5.20 in the after-market trading. Adjusted profit for the second quarter was $15.10 million or $0.17 per share, up from $6.1 million or $0.08 per share last year. Revenue grew 51 percent to $61.5 million. Analysts had expected profit of $0.18 per share on revenue of $65 million.

"Our second quarter results came in below our expectations as we were impacted by lower demand associated with a change in inventory management by one of our large end customers. From a long-term outlook, we are operating from a position of strength, as we believe our core connected home entertainment technology - MoCA 2.0 - will be a key enabling technology for many U.S. and International pay-TV service provider networks," said Patrick Henry, Chief Executive of Entropic.

comScore, Inc. (SCOR) stock dropped 14.62 percent to $17.99 in the after-market trading. Loss for the second quarter was $8.2 million or $0.26 per share, compared to a profit of $825,000 or $0.03 per share last year. Adjusted earnings were $5.36 million or $0.16 per share, down from $6.41 million or $0.20 per share last year. Revenue rose to $58.1 million from $41.96 million, while adjusted revenue grew to $58.4 million from $41.96 million. Analysts had expected a loss of $0.08 per share on revenue of $57.66 million. Looking ahead into the third quarter, the company expects revenue of $58.2 million to $58.8 million, while Street predicts $61.10 million. For the full year 2011, the company projects revenue of $231.1 million to $234.7 million, while Street predicts $237.81 million.

Zumiez, Inc. (ZUMZ) stock fell 13.28 percent to $23.50 in the after-market trading. The company's net sales for the July month grew 12.3 percent to $38.7 million. Comparable-store sales increased 4.9 percent for the four-week period, below the 9.4 percent increase it saw last year. Due the importance of the back to school selling period, the company made the decision to report second quarter fiscal 2011 results and provide third quarter fiscal 2011 guidance in conjunction with August sales results.

Oncothyreon Inc (ONTY) stock tumbled 11.94 percent to $6.34 in the after-market trading.

Career Education Corp. (CECO) stock slid 10.61 percent to $19.55 in the after-market trading. Profit for the second quarter was $55.4 million or $0.73 per share, down from $64.3 million or $0.80 per share last year. Revenue fell to $497.19 million from $527.74 million. Analysts had expected profit of $0.65 per share on revenue of $504.50 million. At the end of the quarter, total student population declined 3 percent to 101,700. Total new student starts at the end of the quarter were 24,880, down 14 percent from last year. The latest quarter also included $2.68 million of non-cash goodwill and asset impairment charges primarily related to accreditation rights for certain schools.