I think there are about 100 of them.
Ask YC: Where can I get a list of YC funded companies?
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Re: Ask YC: Where can I get a list of YC funded companies?
#2The latest number I heard is 102, but I think it's more, if you consider adding the latest round that included divvyshot.
You will find some here: http://ycombinator.com/faq.html at the first question. And you will find some here: http://en.wikipedia.org/wiki/Y_Combinator
Also consider searching TechCrunch for ycombinator, as they write about the startups that's funded by YC.
Re: Ask YC: Where can I get a list of YC funded companies?
#3I don't think there's any public list of non-launched YC companies, but the ones which have launched are listed at http://ycombinator.com/faq.html .