Also: the title. It is not "at exit", but really "at IPO", which might be the most infrequent exit there is.
My favorite startup exit is PlentyOfFish.com. 100% owned by one dude who made over half a billion cash selling it to Match.com.
It is also curious the table rounded Accel's ownership up (12.7 -> 13), but truncated the founders' (37.7 -> 37).
[1] https://www.sec.gov/Archives/edgar/data/1650372/000155837015...
There are many more notable bootstrapped exits, e.g. Mojang/Minecraft.
Lots of bootstrapped companies that could IPO, e.g. Mailchimp
And many other examples of companies that took very little money making their founders richer than comparable funded founders. E.g. Each of the founders of Wayfair made more than EVERYONE involved in the sale of Zappos.