The top after-market NASDAQ gainers Friday were: Metabolix, AXT Inc, Echelon Corp, Ku6 Media Co, Saba Software and Penford Corp. The top after-market NASDAQ losers were: Nortek, TripAdvisor, Groupon, Vera Bradley, Illumina and Amsurg Corp.

Gainers:

Metabolix Inc. (MBLX) stock climbed 7.77 percent to $3.05 in aftermarket trading. The company stock plunged more than 5 percent in regular session.

AXT Inc. (AXTI) stock climbed 7.4 percent to $6.82 in post market trading. The stock has a 52-week low of $3.63, a 52-week high of $9.24 and $204.09 million in market capitalization.

Echelon Corp. (ELON) stock surged 3.84 percent to $4.60 in aftermarket session.

Ku6 Media Co. Ltd. (KUTV) stock gained 2.79 percent to $2.21 in post market session. The company announced that it has entered into an agreement with Star China to launch Channel V's online channel on Ku6's platform.

Saba Software Inc. (SABA) stock gained 1.83 percent to $9.99 in aftermarket session. The company said last Wednesday that it is delaying its third quarter fiscal year 2012 earnings release and investor conference call to allow the company additional time to complete an internal review of the accounting treatment of certain international transactions.

Penford Corp. (PENX) stock advanced 1.82 percent to $6.88 in aftermarket session. The stock has a 52-week low of $4.78, a 52-week high of $7.35 and $76.59 million in market capitalization.

Losers:

Nortek Inc. (NTK) stock slumped 9.35 percent to $39.88 in post market trading. The company stock climbed more than 11 percent in regular session as its fourth quarter net loss narrowed to $800,000 or $0.05 loss per share from $10.1 million or $0.67 loss per share in the same period a year earlier.

TripAdvisor Inc. (TRIP) stock slumped 6.03 percent to $33.52 in aftermarket trading. The stock has a 52-week low of $23.99, a 52-week high of $36.86 and $4.76 billion in market capitalization.

Groupon Inc. (GRPN) stock plunged 5.93 percent to $17.29 in aftermarket session. Shareholder Rights Law Firm Johnson & Weaver, LLP is investigating whether certain officers and directors of Groupon breached their fiduciary duties tothe company and its shareholders in connection with issuing false and misleading statements to the investing public, particularly in light of significant accounting errors in Groupon’s public financial statements.

Vera Bradley Inc. (VRA) stock declined 4.57 percent to $28.81 in aftermarket session.

Illumina Inc. (ILMN) stock fell 4.01 percent to $50.50 in post market trading. Roche Holding AG (ROG), a Basel, Switzerland-based drugmaker, looks forward to the “swift completion” of its takeover offer for Illumina Inc, Bloomberg reported.

Amsurg Corp. (AMSG) stock fell 3.5 percent to $27.00 in aftermarket trading. The stock has a 52-week low of $19.08, a 52-week high of $28.29 and $881.32 illion in market capitalization.

China Law firm Software China