Groupon is raising the funds at a close to $12.7bn valuation, which looks set to net a big return for the European corporates which funded City Deal, owner of 10.3% of Groupon.

YY.com, an online entertainment portal backed by Disney's corporate venturing unit, is planning to file for an IPO next year, expected to raise up to $200m, according to reports from China.

The group buying website, backed by Reinet Investments, an investment company which span off from luxury goods group Richemont, and daily deals company Rebate Networks, files for an IPO set to raise up to $100m.

Siemens-backed medical device company Sphere Medical is set for an initial public offering, from which it expects to raise $24m.

Google and IDG-backed on-line media company Xunlei cancels float due to choppy markets after delaying the listing in July.

The India-based search engine's plans to reportedly list part of its business in the US come after the SAP Ventures-backed business separately filed to list its parent company in India in August.

The energy company backed by corporate venturing unit Energy Technology Ventures and venture firm Kleiner Perkins raised $26.5m in venture funding between November 2006 and May 2011.

Brian O'Kelley, founder and chief executive of AppNexus, told newswire Bloomberg: "The financials, the revenue, the profit and the growth are all strong enough that we could be going public as soon as late next year."

The currency trading platform is backed by 10 banking groups and financial services firms, some of which will be acting as book-running managers for the IPO.

The company floated in Australia rather than the US as its EndoBarrier product for type II diabetes has regulatory approval in the country but has yet to be passed by America's.