Stocks Vonage Holdings Corp

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    Check out which companies are making headlines after the bell Monday.

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    Groupon may be one of the most harshly criticized initial public offerings in years. It seems almost every market pundit has offered damning words on the company's valuation, business model, and its prospects.

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    Luxembourg-based Skype tentatively put the value of the offering at $100 million, but that's a rough estimate only used as a basis for calculating the filing fee for the Securities and Exchange Commission.

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    Exploiting weaknesses in online ad systems is an increasingly common approach for computer criminals around the globe who hope to make a quick buck from the audiences of the sites they attack.

  • Vonage

    Vonage Holdings Corp.  shares surged more than 35 percent Wednesday on growing views the company would survive despite skepticism over its business model. The stock has climbed more than 300 percent in the last week, a rally that has surprised analysts.