Believe it or not, some of Groupon's (NASDAQ:GRPN) IPO underwriters have launched coverage on...

Believe it or not, some of Groupon's (NASDAQ:GRPN) IPO underwriters have launched coverage on the daily deals kingpin with neutral ratings. Included within this group is Deutsche, which is concerned about the profitability of Groupon's future growth, and Citi, which thinks Groupon's current valuation can only be justified if unproven new products pan out. GRPN -2.1%. (yesterday)