First of all, I don't think that PG will answer this question [1]: Q: Have there been any startups you've later regretted rejecting from YCombinator? A: Sure,

First of all, I don't think that PG will answer this question [1]: Q: Have there been any startups you've later regretted rejecting from YCombinator? A: Sure, several. But I can't name names because it's not for me to disclose that they applied. However, YC keeps track of the successful companies that they initially rejected and here are some of them of them that are known to have been rejected who have gone onto raise funding etc: - http://sendgrid.com/ http://sendgrid.com/ (went through TechStars and have raised a series B) - CouchOne - http://www.couchbase.com/ http://www.couchbase.com/ - AfterTheDeadline - Acquired By Automattic - Light Sail Energy - raised money from Khosla Ventures - http://lightsailenergy.com/ http://lightsailenergy.com/ - SignPost - https://www.signpost.com/ https://www.signpost.com/ - Raised $1MM off Google Ventures - MyFit - Raised $1MM - http://www.myfit.com/ http://www.myfit.com/ - Storenvy although they were kicked out of YC [2] - Mark Zuckerberg's Sister Was Also Rejected To YC [3] [1] http://askolo.com/pg#4f6d068aa499a758250003aa http://askolo.com/pg#4f6d068aa499a758250003aa [2] http://joncrawford.com/post/20378314843/how-i-got-kicked-out-of-y-combinator-and-then-raised http://joncrawford.com/post/20378314843/how-i-got-kicked-out... [3] http://www.businessinsider.com/y-combinator-arielle-zuckerbergs-rachel-sklar-2011-11 http://www.businessinsider.com/y-combinator-arielle-zuckerbe...