The top after-market NASDAQ losers Tuesday were: X-Rite, OPNET Technologies, Premier Exhibitions, Applied Micro Circuits Corp, Shuffle Master, Central European Distribution, JDA Software Group, Amylin Pharmaceuticals, Zix Corp and Gencor Industries Inc.

X-Rite, Inc. (XRIT) stock slumped 27.93 percent to $4 in post market session. Shareholder rights firm Robbins Umeda LLP has commenced an investigation into possible breaches of fiduciary duty and other violations of the law by members of the board of directors of XRIT in connection with their efforts to sell the company to Danaher Corp.

OPNET Technologies Inc. (OPNT) stock slumped 6.02 percent to $25.00 in post market session after lowering its fourth quarter guidance. The company currently expects fourth quarter GAAP net income to be in a range of $0.16 to $0.17 per share on revenues of $44.4 to $44.6 million, down from earlier estimation of $0.17 to $0.29 per share on revenues of $45 to $49 million, while analysts’ expect quarterly net profit of $0.26 per share on revenues of $46.99 million.

Premier Exhibitions, Inc. (PRXI) stock plunged 5.77 percent to $2.45 in post market session. Premier Exhibitions and its subsidiary RMS Titanic, Inc., in conjunction with Guernsey's Auction House, is holding for auction more than 5,000 artifacts recovered from the Titanic wreck site, along with related intellectual property and intangibles.

Applied Micro Circuits Corp. (AMCC) stock plunged 4.95 percent to $5.95 after lowering its fourth quarter earnings outlook. The company currently expects adjusted loss to be in a range of $0.10 to $0.12 per share, wider than prior estimation of $0.07 to $0.08 per share.

Shuffle Master, Inc. (SHFL) stock declined 3.51 percent to $15.93 in post market session.

Central European Distribution Corp. (CEDC) stock fell 3.27 percent to $3.85 in post market session.

JDA Software Group, Inc. (JDAS) stock declined 3.20 percent to $26.00 in aftermarket session. The company announced that it will restate its results for fiscal years 2008 to 2010 and the first three quarters of 2011 based on an ongoing review of its revenue recognition policies.

Amylin Pharmaceuticals, Inc. (AMLN) stock fell 2.56 percent to $22.88 in post market session. The stock has a 52-week low of $8.03, a 52-week high of $25.84 and $3.46 billion in market capitalization.

Zix Corp. (ZIXI) stock declined 1.45 percent to $2.71 in post market session.

Gencor Industries Inc. (GENC) stock declined 1.43 percent to $6.90 in aftermarket session.

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