The top after-market Nasdaq gainers Thursday were Acacia Research Corporation, Aruba Networks Inc, WebMD Health Corp, Sourcefire Inc and Unilife Corp, while the top after-market Nasdaq losers were Boingo Wireless Inc, Volcano Corporation, VIVUS Inc and Cytori Therapeutics Inc.

Gainers

Acacia Research Corporation (NASDAQ:ACTG) shares surged 13.45 percent to $32.65 in post-market trading. The company reported $0.86 earnings per share for the fourth quarter, beating the analysts’ estimate of $0.24. The company reported revenues of $66.30 million for the fourth quarter, versus the consensus estimate of $43.33 million.

Aruba Networks Inc (NASDAQ:ARUN) shares climbed 15.40 percent to $24.00 in post-market trading Thursday. The company forecast third-quarter adjusted profit of 20 cents per share on revenues of $159 million to $161 million. Reuters' analysts estimated the Sunnyvale, California-based company to deliver a profit of 20 cents per share on revenues of $158.3 million. Aruba reported a profit of $5 million, or 4 cents per share, compared with a loss of $11.4 million, or 11 cents per share, a year earlier. Analysts on average had expected the company to earn 19 cents per share on revenue of $152 million.

WebMD Health Corp (NASDAQ:WBMD) shares advanced 13.99 percent to $18.58 in post-market trading. The company announced for fiscal 2013, it expects revenues to be in the range of $430 million to $455 million, adjusted EBITDA to be $60 million to $80 million and net loss from continuing operations to be approximately $22 million to $7 million, or $0.45 to $0.13 per diluted share.

For first quarter of 2013, it expects revenue to be in excess of $105 million, adjusted EBITDA to be in excess of 13 percent of revenue, net loss from continuing operations to be approximately 6 percent of revenue. Analysts estimated the company to report revenues of $422 million, EBITDA of $55 million and EPS of $0.44 for fiscal 2013; besides revenue of $94 million, EBITDA of $5 million and EPS of $0.22 for first quarter of 2013.

Sourcefire Inc (NASDAQ:FIRE) shares gained 11.29 percent to $47.02 in post-market trading. The company reported fourth quarter adjusted net income of $0.29 per share after the bell Thursday, compared to $0.25 per share a year ago. The consensus estimate was for EPS of $0.29. First quarter adjusted EPS is expected to be between $0.11 and $0.13. The consensus estimate is for EPS of $0.15.

Unilife Corp (NASDAQ:UNIS) shares advanced 5.74 percent to $2.58 in post-market trading. The company stock has a 52-week average of $2.01-5.17 and a market capitalization of $208.33 million.

Losers

Boingo Wireless Inc (NASDAQ:WIFI) shares declined 23.31 percent to $6.12 in post-market trading. The company reported fourth quarter EPS of $0.03, against analysts' estimation of $0.06. Revenue for the quarter came in at $28 million versus the consensus estimate of $27.5 million.

Volcano Corporation (NASDAQ:VOLC) shares dropped 4.74 percent to $23.50 in post-market trading. Volcano Corp announced that it expects revenues to be in the range of $406-$412 million, net loss on a GAAP basis of $0.19-$0.23 per share, and non-GAAP net income of $0.08-$0.11 per diluted share (EPS) for fiscal 2013. Analysts’ estimation forecast revenues of $424 million, net income of $15.84 and EPS of $0.28 for fiscal 2013.

VIVUS Inc (NASDAQ:VVUS) shares slumped 2.95 percent to $12.50 in post-market trading. The company shares traded down after it announced Thursday that the European Medicine Agency's (EMA) Committee for Medicinal Products for Human Use (CHMP) confirmed its Oct. 18, 2012 decision to decline the Marketing Authorization Application (MAA) for Qsiva™ (phentermine/topiramate ER) for treatment of obesity in the European Union.

Cytori Therapeutics Inc (NASDAQ:CYTX) shares fell 1.67 percent to $2.35 in post-market trading. The company stock has a 52-week average of $2.01-$4.93 and a market capitalization of $140.61 million.

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