Paul Graham, Brad Feld, Me, BBC
But I have said at this blog a few times that I don't see any iconic company emerging out of Y Combinator. Y Combinator has had a propensity to produce middling companies. A $200 million exist is not impressive.
Greplin
And let me make it very clear I have not been reading up on Y Combinator companies. There must be gems being spewed out every few months. But I only read about companies that show up in the news.