The top after-market Nasdaq gainers Friday were Geron Corporation, Harmonic Inc, Vitesse Semiconductor Corporation and Exelixis Inc.

The top after-market Nasdaq losers were ZAGG Inc, Myriad Genetics, Questcor Pharmaceuticals Inc and Corinthian Colleges Inc.

Gainers

Geron Corporation (GERN) shares climbed 3.29 percent to $2.20 in after-hours trading. The company shares gained after a media report that two of its experimental cancer drugs are in mid-stage development and are expected to be ready for the market in two years.

Harmonic Inc (HLIT) rose 2.45 percent in post-market trading to close at $4.60. The company shares have a 52-week low of $3.76, a 52-week high of $6.81 and $527.90 million in market capitalization.  

Vitesse Semiconductor Corporation (VTSS) shares advanced 1.62 percent to $ 2.51 in post-market trading. The company shares had lost 6.44 percent in regular trading.

Exelixis Inc (EXEL) shares went up by 1.60 percent to $4.45 in the post-market trading Friday. The company stock has a 52-week trading range of $3.94-$8.25 and $652.12 million in market capitalization.  

Losers

ZAGG Inc (ZAGG) slumped 4.99 percent to $8.00 in the post-market trading Friday. The company announced that Robert G. Pedersen II has stepped down as Chief Executive Officer (CEO) and Chairman. ZAGG President and COO Randall Hales has been appointed the interim CEO by the Board of Directors.

Myriad Genetics (MYGN) shares declined 2.48 percent to $5.90 in after-hours trading.  The shares have a 52-week low of $17.90, a 52-week high of $27.00 and $2.07 billion in market capitalization.   

Questcor Pharmaceuticals Inc (QCOR) shares lost 3.46 percent in the after-hours trading to reach $38.22. The shares have a 52-week low of $24.14, a 52-week high of $58.91 and $2.36 billion in market capitalization.   

Corinthian Colleges Inc (COCO) shares dropped 2.41 percent to $2.39 in after-hours trading. The shares have a 52-week low of $1.24, a 52-week high of $5.21 and $208.68 million in market capitalization.