The top after-market Nasdaq gainers Wednesday were First Solar Inc, Cavium Inc, Green Mountain Coffee Roasters Inc, SunPower Corporation and United Online Inc.

The top after-market Nasdaq losers were Halozyme Therapeutics Inc, Zumiez Inc, Solta Medical Inc, LivePerson Inc and Synchronoss Technologies Inc.

Gainers

First Solar Inc (FSLR) shares climbed 18.92 percent to $17.60 in after-hours trading Wednesday. The company reported the second quarter earnings per share of $1.27, beating the analysts' consensus estimate of $0.92 by $0.35. First Solar's revenue was up by 82 percent compared to the same quarter last year. The company also raised its full-year forecast.

The shares of Cavium Inc (CAVM) rose 14.74 percent in the post-market to close at $31.61. The company Wednesday reported a narrower sequential loss for the second quarter. The California-based company's second-quarter net loss was $11.84 million or $0.24 per share, compared to $13.83 million or $0.28 per share in the last quarter. Total revenues for the quarter grew 4.8 percent to $55.29 million, beating the consensus revenue estimate of $55.15 million for the quarter.

Green Mountain Coffee Roasters Inc (GMCR) shares advanced 12.67 percent to $20.18 in post-market trading. The company Wednesday announced the third-quarter earnings that beat analysts' expectations.

The company's adjusted net income rose to $82.93 million or $0.52 per share from $75.75 million or $0.49 per share in the same period last year.  Analysts expected the company to earn $0.50 per share. Green Mountain's board of directors has authorized the company to repurchase up to $500 million of its common shares over the next two years.

SunPower Corporation (SPWR) shares gained 8.47 percent and reached $4.10 in after-hours trading. The company shares have a 52-week low of $3.71, a 52-week high of $4.10 and $606.22 million in market capitalization.

United Online (UNTD) shares surged 7.14 percent to $ 4.50 in after-hours trading Wednesday. The company said its board approved a preliminary plan to split the company into two independent, publicly traded firms. As part of the separation, FTD will become a separate, publicly-traded company, which will include the domestic and international operations of its FTD segment. In addition, the company said that it was reviewing strategic options for its Content & Media and Communications businesses.

Losers

Halozyme Therapeutics Inc (HALO) shares slumped 54.67 percent to $ 3.88 in post-market trading Wednesday. The company Wednesday confirmed that Baxter had received complete response letter for HyQ BLA License Application.   

Zumiez Inc (ZUMZ) shares plunged 11.24 percent to $31.89 in post-market trading. The company announced that its total net sales for the four-week period ended July 28, 2012 increased 21.5 percent to $47.0 million, compared to $38.7 million for the four-week period ended July 30, 2011.

Solta Medical Inc (SLTM) shares lost 5.96 percent in after-hours trading to reach $3.00. The company announced that it had commenced an underwritten public offering of its common stock. Solta Medical expects to grant the underwriters a 30-day option to purchase up to an additional 15 percent of the shares of common stock offered in the public offering solely to cover over-allotments, if any.

LivePerson Inc (LPSN) shares dropped 5.97 percent to $ 16.86 in after-hours trading. The company's second-quarter net profit was $140 thousand or break-even per share, compared to $2.20 million or $0.04 per share last year. Adjusted income for the quarter dropped to $2.86 million or $0.05 per share from $4.19 million or $0.08 per share in the prior-year quarter. Analysts had expected the company would earn $0.09 per share in the quarter.

Synchronoss Technologies Inc (SNCR) shares lost 5.38 percent to $17.05 in after-market trading Wednesday.