How Zynga’s IPO went from a $20B valuation to $8.9B in five months

When credible reports about Zynga’s upcoming IPO filing started flying this July, expectations for the social gaming giant’s value were running $15 billion to $20 billion. Now, with Zynga detailing the offering ahead of trading set to start December 15th, the actual offering price could value the company from $5.9 billion to $6.99 billion, or $7.6 billion to $8.9 billion including employee stock options.