The top after-market Nasdaq gainers Wednesday were Amyris Inc, Theravance Inc, KiOR Inc, Mitcham Industries Inc and TechTarget Inc. The top after-market Nasdaq losers were Cross Country Healthcare Inc, Warner Chilcott plc, SeaChange International Inc, Conn's and ZAGG Inc.

Gainers

Amyris Inc (AMRS) shares climbed 10.76 percent to $3.50 in after-hours trading. The shares lost 9.71 percent in regular trading Wednesday. The company shares have a 52-week trading range of $ 1.57 - $21.47 and $ 185.62 million in market capitalization.  

Theravance Inc (THRX) rose 6.69 percent in post-market trading to close at $25.85. The company shares lost 6.27 percent in regular trading Wednesday. Theravance Inc shares have a 52-week trading range of $12.91-$31.87 and $2.35 billion in market capitalization.  

KiOR Inc (KIOR) shares advanced 6.67 percent to $7.36 in post-market trading. The shares lost 6.25 percent in regular trading Wednesday and have a 52-week trading range of $6.34 - $23.85 and $ 723.13 million in market capitalization.  

Mitcham Industries (MIND) shares gained 6.09 percent and reached $16.55 in after-hours trading. The company Wednesday reported the second quarter profits that exceeded analysts' estimates, helped mainly by a tax benefit.    The net income for the second quarter was $6.4 million or $0.48 per share (include a benefit of about $5.3 million in tax settlement benefit) and $1.1 million or $0.08 per share, excluding the tax benefit against the analysts' expectation of $0.05 per share for the second quarter. Analysts' estimates typically exclude special items.

Net revenues for the second quarter increased to $23.10 million from $21.28 million in the corresponding quarter a year ago, better than the market expectation of $21.68 million. 

TechTarget Inc (TTGT) shares went up 6.27 percent to $5.42 in post-market trading. The company shares have a 52-week trading range of $3.98 - $7.88 and $201.34 million in market capitalization.  

Losers

Cross Country Healthcare Inc (CCRN) shares plunged 8.71 percent to $4.09 in after-hours trading. Citigroup upgraded shares of Cross Country Healthcare from a neutral rating to a buy rating Wednesday, sending the shares up 9.54 percent in regular trading.  The shares have a 52-week low of $3.76, a 52-week high of $6.73 and $138.44 million in market capitalization.

Warner Chilcott Plc (WCRX) shares lost 8.39 percent in the after-hours trading to reach $13.00. The company announced a secondary offering of its ordinary shares by certain selling shareholders. The selling shareholders include funds affiliated with Bain Capital Partners, J.P. Morgan Partners (advised by CCMP Capital) and Thomas H. Lee Partners, L.P., and members of the company's senior management, Reuters reported. 

SeaChange International Inc (SEAC) shares dropped 8.14 percent to $7.90 in after-hours trading. The company reported the second-quarter adjusted profit below the Wall Street expectations, hurt by a sharp drop in gross margins, and the video management software maker forecast weak third-quarter earnings.

Conn's Inc (CONN) shares declined 7.49 percent to $23.95 in after-hours trading.  The shares surged 8.10 percent in regular trading Wednesday after the company reported an EPS of $0.36 for the quarter, beating the analysts' consensus estimate of $0.35 by $0.01.  

ZAGG Inc (ZAGG) slumped 6.64 percent to $7.87 in the post-market trading Wednesday.