The top after-market Nasdaq gainers Tuesday were magicJack VocalTec Ltd, Zynga Inc, Novavax Inc, Zoltek Companies Inc, and Aware Inc. The top after-market Nasdaq losers were Sucampo Pharmaceuticals Inc, Vodafone Group Plc, Tesla Motors Inc, and Ares Capital Corporation.

Gainers

magicJack VocalTec Ltd (NASDAQ:CALL) shares climbed 15.05 percent to $17.20 in post-market trading. The company announced that Richard Harris has been named to its board of directors and Jose Gordo has been appointed senior vice president of finance.

Zynga Inc. (NASDAQ:ZNGA) shares rose 8.47 percent to $3.33 in post-market trading. Dan Porter, the head of Zynga's New York Studio and former chief executive of OMGPOP quit the social gaming company a year after its $180 million purchase of his mobile game start-up failed to produce the expected results. Dan Porter had earlier publicly apologized for commenting that Zynga copied games from other developers hurting the reputation of Zynga.  

Novavax Inc. (NASDAQ:NVAX) shares advanced 8.51 percent to $2.55 in post-market trading. The company announced that the top-line data from the Phase II dose-ranging clinical trial of its respiratory syncytial virus (RSV) vaccine candidate in women of childbearing age accomplished the trial's protocol-specified objectives and supports progression to the next stage of advanced clinical testing.

Zoltek Companies Inc. (NASDAQ:ZOLT) shares gained 5.70 percent to $12.98 in post-market trading. The company announced that it is commencing a process to explore and evaluate strategic alternatives to maximize shareholder value. The company has engaged J.P. Morgan Securities LLC as the company's financial advisor for this process.

Aware Inc. (NASDAQ:AWRE) shares surged 5.64 percent to $5.06 in post-market trading. The company shares gained over 4 percent in regular trading.

Losers

Sucampo Pharmaceuticals Inc. (NASDAQ:SCMP) shares plunged 4.90 percent to $6.02 in post-market trading. The company shares have a 52-week trading range of $3.78-$8.50 and a market capitalization of $265.67 million.

Vodafone Group Plc. (NASDAQ:VOD) shares declined 2.91 percent to $28.55 in post-market trading.  The company shares gained over 3 percent in regular trading.

Tesla Motors Inc. (NASDAQ:TSLA) shares lost 2.80 percent to $43.10 in post-market trading. The company shares have a 52-week trading range of $25.52-$46.68 and a market capitalization of $5.08 billion.

Ares Capital Corporation (NASDAQ:ARCC) shares dropped 2.77 percent to $17.53 in post-market trading. The company shares have a 52-week trading range of $14.60-$18.67 and a market capitalization of $4.48 billion.