Online coupon site Groupon and Internet radio company Pandora are moving ahead with plans for initial public offerings, according to sources familiar with the matter. Chicago-based Groupon is meeting with bankers to explore prospects for a “meaningfully-sized” IPO after a recent bid from Google Inc – reported at $6bn (£3.8bn) – fell apart, one source said. The company's IPO could be for $1bn to $1.5bn, CNBC reported. If the IPO goes ahead, it would rank among the largest tech IPOs in the US of the past decade, according to Thomson Reuters data. Pandora met with bankers on Tuesday about a possible $100m IPO and could pick banks to lead the offering as soon as Friday, said an unnamed source. Groupon was not immediately available for comment. Pandora declined to comment.