Groupon Inc, the largest online daily deals company, has added 11 new underwriters for its upcoming initial public offering.

JPMorgan , Allen & Co, Bank of America Merrill Lynch , Barclays Capital , Citigroup , Deutsche Bank Securities , William Blair & Co, Citadel Securities, Loop Capital Markets, RBC Capital Markets and the Williams Capital Group, were added as underwriters, according to an updated regulatory filing.

Morgan Stanley , Goldman Sachs and Credit Suisse were the lead underwriters named on Groupon's original IPO filing on June 2.

(Reporting by Alistair Barr. Editing by Robert MacMillan)