After all the hullabaloo last week when Groupon debuted on NASDAQ, this week hasn't seen any big Groupon news. Instead, the company's scribbled down to a low on Wednesday of 23.61 and then bounced back a bit to end the week at 24.25, down from its open at 28.

Here's the chart:

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At the current share price, the company has a market value of more than $15 billion, greater than Delta and United Continental Airlines combined. That said, Groupon is among the top ten companies people are betting against; 5.5 percent of the company's shares are held by short sellers.