The top after-market Nasdaq gainers Friday were Cynosure Inc, Maxygen Inc, KiOR Inc and Cray Inc. The top after-market Nasdaq losers were TGC Industries Inc, Emmis Communications Corporation, Steel Dynamics Inc and Merge Healthcare Inc.

Gainers

Cynosure Inc (CYNO) shares climbed 3.61percent to $28.16 in after-hours trading. The company shares have a 52-week low of $9.27, a 52-week high of $28.00 and $352.13 million in market capitalization.  

Maxygen Inc (MAXY) rose 3.32 percent in post-market trading to close at $2.80. The company announced that the Board of Directors has authorized a special pro rata distribution of $3.60 per share for each outstanding share of Maxygen common stock owned on the close of business August 21. The cash distribution will total approximately $100.0 million in the aggregate based on the shares of the company's common stock outstanding July 31.

KiOR Inc (KIOR) shares advanced 2.46 percent to $7.50 in post-market trading. The company shares have a 52-week trading range of $6.34 - $23.85 and $767.14 million in market capitalization.

Cray Inc (CRAY) shares went up 2.53 percent to $12.17 in post-market trading Friday. The company stock has a 52-week trading range of $4.96 -$12.93 and $456.49 million in market capitalization.  

Losers

TGC Industries Inc (TGE) slumped 4.08 percent to $6.35 in the post-market trading Friday.  The shares have a 52-week low of $3.70, a 52-week high of $11.85 and $135.31 million in market capitalization.   

Emmis Communications Corporation (EMMS) shares declined 3.12 percent to $2.34 in after-hours trading.  The shares have a 52-week low of $0.58, a 52-week high of $2.57 and $93.90 million in market capitalization.   

Steel Dynamics Inc (STLD) shares lost 1.70 percent in the after-hours trading to reach $12.11. The company shares surged 3.18 percent in regular trading on news that the Chinese government had approved 60 infrastructure projects to boost growth.   

Merge Healthcare Inc (MRGE) shares dropped 1.46 percent to $3.37 in after-hours trading. The shares lost 3.39 percent in regular trading Friday. The shares were downgraded by Dougherty & Co from a buy rating to a neutral rating in a research note issued Friday.