The top after-market NYSE gainers Thursday were Pandora Media, H&R Block, Express, Wuxi Pharmatech and Smithfield Foods. The top after-market NYSE losers were Medifast, Quiksilver, AVG Technologies, Arlington Asset Investment Corp and Biomed Realty Trust Inc.

Gainers

Pandora Media Inc. (NYSE:P) shares rallied 20.72 percent to $14.16 in post-market trading. Its fourth quarter net loss widened to $14.6 million or $0.09 per share from $8.2 million or $0.05 per share in the same period last year. Adjusted loss widened to $0.04 per share from $0.03 per share last year but came in better than analysts’ estimate of a loss of $0.05 per share

H&R Block Inc. (NYSE:HRB) shares climbed 5.52 percent to $26.36 in post-market trading. Its third quarter loss from continuing operations widened to $17 million or $0.06 per share from $4 million or $0.01 per share in the same quarter last year. Adjusted net loss was $60 million or $0.22 per share compared to break-even in the prior year.

Express Inc. (NYSE:EXPR) shares surged 4.26 percent to $19.60 in post-market trading. The stock has a 52-week low of $10.47, a 52-week high of $26.27 and $1.61 billion in market capitalization.

Wuxi Pharmatech (Cayman) Inc. (NYSE:WX) shares gained 4.10 percent to $18.01 in post-market trading. The company reported fourth quarter net profit of $23.8 million or $0.33 per ADS compared to $23.5 million or $0.31 per ADS in the same period last year. Adjusted profit was $0.38 per ADS, above Reuters’ estimate of $0.30 per share.

Smithfield Foods Inc. (NYSE:SFD) shares advanced 2.23 percent to $25.23 in post-market trading. The stock rallied more than 10 percent in regular trading after the company reported better-than-expected third quarter earnings. Its third quarter net profit rose to $81.5 million or $0.58 per share from $79 million or $0.49 per share in the same quarter last year and also topped analysts’ estimate of $0.51per share.

Losers

Medifast, Inc. (NYSE:MED) shares slumped 10.04 percent to $21.95 in post-market trading. Currently, the company expects first quarter net profit to be in a range of $0.32 to $0.35 per share on revenues of $93 to $95 million, below analysts’ estimate of a net profit of $0.45 per share on revenues of $101.13 million.

Quiksilver, Inc. (NYSE:ZQK) shares slumped 9.54 percent to $5.69 in post-market trading. Its first quarter net loss widened to $31.1 million or $0.19 per share from $22.6 million or $0.14 per share in the same period a year earlier. Adjusted loss was $0.16 per share, worse than analysts estimate of a loss of $0.07 per share.

AVG Technologies NV (NYSE:AVG) shares plunged 6.37 percent to $14.69 in post-market trading. The company announced Thursday that J.R. Smith has resigned as CEO and will become a member of the Supervisory Board.

Arlington Asset Investment Corp. (NYSE:AI) shares fell 3.14 percent to $25.59 in post-market trading. The company announced Thursday that it has commenced an underwritten registered public offering of 3,000,000 shares of Class A common stock.

Biomed Realty Trust Inc. (NYSE:BMR) shares declined 3.07 percent to $20.85 in post-market trading. The stock has a 52-week low of $17.52, a 52-week high of $21.71 and $3.32 billion in market capitalization.

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