I guess, but that is how private companies are valued every day. I sell you 5% for $1 million, we are both agreeing that the company is worth $20 million.
Groupon floated a record-low percentage of its total outstanding shares among U.S. Internet companies, helping to stoke demand. Only 4.7 percent of the stock was made available to the public, based on the offering terms. That’s less than in any U.S. Internet company IPO of more $200 million since at least 2000, Bloomberg data show.
http://www.bloomberg.com/news/2011-11-03/groupon-said-to-rai...
Recall Google: http://en.wikipedia.org/wiki/History_of_Google#Financing_and...
They floated 14m out of 271m total shares, and other stockholders added another 5m or so... so the total amount it IPO'd for was around 7% of the company but GOOG's share was roughly 5%