The top after-market NASDAQ gainers Friday were: DepoMed, Pacific Biosciences of California, Oclaro, Zynga and Eagle Rock Energy Partners. The top after-market NASDAQ losers were: Zogenix, RAM Energy Resources, Electronics for Imaging, 21Vianet Group and Micron Technology.

Gainers:

DepoMed Inc. (DEPO) shares surged 4.78 percent to $7.02 in aftermarket trading session. The company announced that Merck disclosed on Feb. 2, 2012 that the U.S. Food and Drug Administration (FDA) approved JANUMET XR ( sitagliptin and metformin hydrochloride extended-release) tablets, a new treatment for type 2 diabetes that combines sitagliptin with extended-release metformin.

Pacific Biosciences of California Inc. (PACB) shares gained 4.55 percent to $5.05 in post market trading session. The company stock gained more than 4 percent in regular trading session.

Oclaro Inc. (OCLR) shares advanced 4.17 percent to $5 in aftermarket trading session.

Zynga Inc. (ZNGA) shares rose 4.11 percent to $13.44 in post market trading session. The stock has a 52-week low of $7.97, a 52-week high of $14.44 and $9.36 billion in market capitalization.

Eagle Rock Energy Partners, L.P. (EROC) shares advanced 3.56 percent to $11.35 in post market trading session.

Losers:

Zogenix Inc. (ZGNX) shares slumped 12.09 percent to $2.40 in post market trading session on news that the company filed a plan to sell as much as $75 million of securities, Bloomberg reported.

RAM Energy Resources Inc. (RAM) shares plunged 4.2 percent to $3.65 in post market trading session.

Electronics for Imaging Inc. (EFII) shares declined 2.93 percent to $17.24 in aftermarket trading session. The stock has a 52-week low of $12.71, a 52-week high of $19.17 and $1.36 billion in market capitalization.

21Vianet Group Inc. (VNET) shares declined 2.27 percent to $11.83 in post market trading session.

Micron Technology Inc. (MU) shares fell 2.14 percent to $7.78 in post market trading session. The company appointed Mark Durcan as chief executive officer of the company and also as a member of its Board of Directors after CEO Steven R. Appleton died in a Feb. 3 airplane accident in Boise, Idaho.

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