In recent history, Mint.com is the poster child, however there is still an open question about whether he sold too early. Lots of people like to point out Drew

In recent history, Mint.com is the poster child, however there is still an open question about whether he sold too early. Lots of people like to point out Drew Houston of Dropbox as another single-founder success story (and it is!), but he did have a co-founder by the time they presented at Demo Day (if not before YC started, I can't remember which). However, he did apply as a single-founder. Here is his YC S07 application: http://dl.dropbox.com/u/27532820/app.html http://dl.dropbox.com/u/27532820/app.html