We're approaching the closing bell and Groupon, Inc. (Nasdaq Ticker: GRPN) last traded at $27.21, up 36% from it's IPO price of $20 a share.  A total of 45 million shares traded hands. Groupon, an Internet darling with no profits but plenty of momentum, opened at $28 - a 40% jump and, at its high, traded at $31.14.  At that price, Groupon had a valuation of $19 billion.  Its low for the day was $25.90. As anticipated, the small float of shares helped buffer the price.  Only 35 million shares were sold in the IPO - or about 5% of the total.  Underwriters also have the option to sell an additional 4.5 million shares.  The $700 million offering - the 2nd largest for a technology company this year - did not eclipse the 1995 IPO of web browser Netscape, the offering that is credited with launching a thousand dot-com IPO’s. Nevertheless, today's showing was welcome news for Internet companies that are waiting in the wings to go public.  Demand for Groupon shares was so high that orders were more than 10 times the amount of the shares offered.  And, at least for the time being, people appear to be willing to take risk again.  It remains to be seen if, come Monday, the new batch of Groupon investors and wannabe investors will be as faithful.    [DealBook, 11/4/11]