Online coupon company Groupon may be raising, or may have already raised, up to $950 million more in venture capital, according to documents reported on today by venture blog VC Experts.

This would be the company's Series G round of funding. Rounds A through F totalled $171 million, according to Crunchbase. That means that after walking away from a rumored $6 billion acquisition offer from Google, the company may have gone on to raise more than five times all its previous funding. Mystery investors have been watching, and they like what they have seen. VC Experts argues that the funding will be used in order for the site to expand internationally, something it has said it intends to do before filing an IPO, instead of being acquired.