The top after-market NASDAQ stock market gainers are: Genoptix, Infinera, Amgen, Powerwave Technologies, Pixelworks, SmartHeat, Endwave, SuperMedia, Cytokinetics, and YRC Worldwide.

Genoptix, Inc. (GXDX) surged 16.80 percent to $21 in the after-market trading. The company has put itself up for sale, the Bloomberg reported citing people familiar with the process. The Carlsbad, California-based Genoptix, having a market cap of $316.61 million as of Monday, has reportedly hired Barclays Plc to conduct an auction.

Infinera Corp. (INFN) soared 8.38 percent to $11.12 in the after-hours session.

Amgen Inc. (AMGN) jumped 7.36 percent to $58.09 in the after-market trading. The company announced encouraging results from a Phase 3 trial evaluating XGEVA versus placebo in men afflicted with castrate-resistant prostate cancer. The trail known as the '147 study' showed that XGEVA or Denosumab perceptibly improved median bone metastasis-free survival by 4.2 months compared with placebo, which was the primary endpoint.

Powerwave Technologies Inc. (PWAV) improved 5.23 percent to $2.52 in the after-hours session.

Pixelworks Inc. (PXLW) climbed 3.88 percent to $3.75 in the after-market trading.

SmartHeat Inc. (HEAT) grew 3.67 percent to $5.79 in the after-hours session.

Endwave Corp. (ENWV) gained 3.52 percent to $2.35 in the after-market trading.

SuperMedia Inc. (SPMD) increased 3.41 percent to $9.10 in the after-hours session.

Cytokinetics Inc. (CYTK) rose 3.07 percent to $2.35 in the after-market trading.

YRC Worldwide Inc. (YRCW) moved up 3.04 percent to $3.39 in the after-hours session.

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