The top after-market Nasdaq gainers Monday were China Sunergy Co Ltd, JA Solar Holdings Co, Canadian Solar Inc, Rockwell Medical Inc, and BioMarin Pharmaceutical Inc. The top after-market Nasdaq losers were Urban Outfitters, Pain Therapeutics Inc, TCP Capital Corp, and Web.com Group Inc.

Gainers

China Sunergy Co Ltd (NASDAQ:CSUN) shares climbed 6.35 percent to $2.68 in post-market trading. The company stock surged 50 percent in regular trading on Monday.

JA Solar Holdings Co Ltd (NASDAQ:JASO) shares rose 5.68 percent to $10.10 in post-market trading. The company stock soared more than 70 percent in regular trading on Monday. JA Solar's operating loss fell to $13.7 million in the first quarter ended March 31, from $25.6 million a year earlier and net loss narrowed to $0.85 per share, from $1.03 per share a year earlier. Net revenues in the first quarter of 2013 were $270 million, an increase of 4.7% from $258 million in the first quarter of 2012.

Canadian Solar Inc. (NASDAQ:CSIQ) shares advanced 3.49 percent to $9.50 in post-market trading. The company stock jumped more than 17 percent in regular trading on Monday. The company announced that the Jiangsu Suzhou Intermediate Court dismissed the request by LDK Solar Co Ltd. (NYSE: LDK) to enforce an arbitration award decision by the former Shanghai branch of the China International Economic and Trade Arbitration Commission in the amount of RMB 248.9 million ($40.1 million).

Rockwell Medical Inc. (NASDAQ:RMTI) shares gained 2.27 percent to $3.60 in post-market trading. The company announced on Monday the closing of the sale of 13,196,721 common shares, including 1,721,311 common shares to cover over-allotments, at $3.05 a share in an underwritten public offering for an aggregate offering amount of about $40.3 million. Rockwell Medical plans to use the net proceeds of $37.7 million from the offering to fund SFP clinical trials and for other general corporate purposes.

BioMarin Pharmaceutical Inc. (NASDAQ:BMRN) shares rose 1.87 percent to $63.60 in post-market trading. The company shares lost more than 2 percent in regular trading on Monday.

Losers

Urban Outfitters Inc. (NASDAQ:URBN) shares fell 4.47 percent to $42.50 in post-market trading. The company’s net income rose 39 percent to $47.1 million, or $0.32 a share, in the quarter ended April 30, topping analysts’ estimate of $0.29 a share. However, overall sales rose 14 percent to $648.2 million in the quarter, but missed the average analyst estimate of $655.7 million.

Pain Therapeutics Inc. (NASDAQ:PTIE) shares dropped 3.99 percent to $2.89 in post-market trading. The company stock climbed more than 4 percent in regular trading on Monday after the biopharmaceutical company was upgraded by Zacks from an “underperform” rating to a “neutral” rating in a research note issued on Monday.

TCP Capital Corp. (NASDAQ:TCPC) shares declined 3.95 percent to $15.56 in post-market trading. The company announced on Monday that it has commenced a public offering of 4 million shares of its common stock. TCPC intends to use the net proceeds of this offering to repay amounts outstanding under its $116 million revolving credit facility.

Web.com Group Inc. (NASDAQ:WWWW) shares dropped 3.92 percent to $21.55 in post-market trading. The company stock gained more than 4 percent in regular trading on Monday. The company stock has a 52-week low of $13.25, a 52-week high of $22.84 and $1.12 billion in market capitalization.

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