The top after-market Nasdaq gainers Thursday were Blue Nile Inc, OpenTable Inc, MercadoLibre Inc, Skullcandy Inc and Sequenom Inc.

The top after-market Nasdaq losers were Body Central Corp, Zipcar Inc, Exide Technologies Inc, Tractor Supply Company and comScore.

Gainers

Blue Nile Inc (NILE) shares climbed 22.11 percent to $29.00 in after-hours trading Thursday. The company announced second quarter earnings Thursday and gave a better-than-expected revenue forecast for the third quarter. For the current quarter, its profit declined from last year but met the market expectations.

 The company expects net sales to be between $87.0 million and $91.0 million for the third quarter, and for fiscal 2012, it expects the net sales to be between $384.0 million and $417.0 million and earnings per diluted share (EPS) are expected to be between $0.70 to $0.85. Analysts are expecting the company to report revenues of $85 million and EPS of $0.17 for the third quarter of 2012 and revenues of $389.8 for the fiscal 2012. 

The shares of OpenTable Inc (OPEN) rose 14.20 percent in the post-market to close at $39.00. The company's second quarter profit declined from the same period last year, while its non-GAAP earnings per share were above analysts' projection. The company reported second quarter EPS of $0.42, better than the analyst estimate of $0.37.

The revenue for the quarter came in at $39.6 million versus the consensus estimate of $39.44 million. For the FY12, the company expects an EPS of $1.54 - $1.66 and revs of $160 - $164 million, versus the consensus estimate of $1.57 and revenues of $161.7 million.

MercadoLibre Inc (MELI) shares advanced 13.48 percent to $13.48 in the post-market trading. The Argentina-based e-commerce company announced second quarter earnings that topped analysts' expectations.

Mercadolibre's second-quarter net income was $25.38 million or $0.57 per share, up from $14.82 million or $0.34 per share in the previous-year quarter. Analysts expected the company to earn $0.49 per share for the quarter. The consolidated net revenues for the quarter rose 28 percent to $88.84 million versus the analysts' consensus estimate of $88.02 million.

Skullcandy Inc (SKUL) shares gained 7.44 percent and reached $14.88 in after-hours trading. The headphone maker announced that the second quarter net income for the company rose to $6.8 million or 24 cents per share in the second quarter, from $4.3 million or 22 cents per share, a year earlier.  Analysts on average were expecting earnings of 22 cents per share on the  revenue of $65.9 million.

Sequenom (SQNM) shares surged 6.96 percent to $2.92 in after-hours trading Thursday.  

Losers

Body Central Corp (BODY) shares slumped 17.21 percent to $13.30 in the post-market trading Thursday. The company's second quarter profit and revenues increased from the year-ago quarter and were above analysts' estimates. However, the company projected its third quarter results below analysts' expectations and lowered its full-year guidance.  The revenue for the quarter came in at $79.4 million versus the consensus estimate of $78.53 million. The company projected an EPS of $0.02-$0.04, versus the consensus of $0.13 for the third quarter. It expects an EPS of $0.80-$0.83, versus the consensus estimate of $1.08, and revenue of $314-$317 million versus the consensus of $322.8 million for the FY 2012. 

Zipcar Inc (ZIP) shares plunged 16.46 percent to $8.88 in the post-market trading. The company reported a second quarter net loss narrowed from the year-ago quarter. The revenue increased 15 percent to $70.8 million versus the consensus estimate of $73.06 million. The company anticipates 2012 revenue of $272-$278 million versus the consensus of $290.8 million. 

Exide Technologies Inc (XIDE) shares lost 16.67 percent in after-hours trading to reach $2.40. The company reported second quarter loss per share of $1.38 versus a loss of $0.07 a year ago. The revenue for the quarter came in at $693.4 million versus the consensus estimate of $736.78 million.

The Tractor Supply Company (AMRS) shares dropped 11.23 percent to $79.29 in after-hours trading. The company announced that its board of directors declared a quarterly cash dividend of $0.20 per share of the company's common stock.

comScore (SCOR) shares dropped 11.07 percent to $13.74 in after-market trading as the company announced second quarter revenues that were lower than the analysts' estimates.