The top after-market NASDAQ losers Tuesday were: Pacific Sunwear of California, Zhongpin, Knightsbridge Tankers, American Superconductor, Healthways, Fortinet, Entropic Communications, Medallion Financial Corp, Great Wolf Resorts and Silicon Motion Technology Corp.

Pacific Sunwear of California, Inc. (PSUN) stock slumped 17.53 percent to $2.07 in post market trading session. The company reported fourth quarter net loss of $38.1 million or $0.56 per share compared to loss of $35.2 million or $0.53 per share in the same period last year. The company also expects first quarter non-GAAP net loss to be in a range of $0.26 to $0.34 per share compared to analysts’ estimation of loss of $0.24 per share.

Zhongpin Inc. (HOGS) stock slumped 7.13 percent to $9.77 in post market trading session. The company reported fiscal 2011 earnings per share of $1.66 compared to $1.65 per share in the same period last year and against analysts’ estimation of $1.91 per share. The company expects fiscal 2012 earnings to be in a range of $1.36 to $1.92 per share on revenues of $1.55 to $1.72 billion compared to analysts’ estimation of $2.30 per share on revenues of $1.8 billion.

Knightsbridge Tankers Ltd. (VLCCF) stock plunged 5.72 percent to $14.00 in aftermarket trading session. The company announced that Golden Ocean Group Limited is offering to sell 2,438,199 Knightsbridge common shares in an underwritten public offering pursuant to an effective shelf registration statement filed with the Securities and Exchange Commission.

American Superconductor Corp. (AMSC) stock plunged 5.53 percent to $3.93 in aftermarket trading session. The company stock climbed more than 8 percent in regular session.

Healthways, Inc. (HWAY) stock declined 4.71 percent to $7.28 in post market trading session.

Fortinet, Inc. (FTNT) stock fell 4.53 percent to $26.55 in post market trading. The stock has a 52-week low of $15.78, a 52-week high of $28.56 and $4.35 billion in market capitalization.

Entropic Communications, Inc. (ENTR) stock declined 4.26 percent to $6.07 in aftermarket trading session.

Medallion Financial Corp. (TAXI) stock declined 4.11 percent to $10.50 in post market trading session.

Great Wolf Resorts, Inc. (WOLF) stock declined 4.28 percent to $5.09 in aftermarket session. The company stock climbed nearly 27 percent in regular trading after WOLF announced that it has agreed to be acquired by alternative investment manager Apollo Global Management, LLC for about $703 million.

Silicon Motion Technology Corp. (SIMO) stock fell 2.3 percent to $17.98 in aftermarket session.

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