I made a list a while ago but it's a couple years out of date. It's probably a big underestimate because I last updated it before Clojure started to boom. I'll add anything people mention in this thread and if anyone knows more, email peter @ pchristensen . com

http://www.pchristensen.com/blog/lisp-companies/

Yep, I just been to the new lisp meeting in Zürich. The meeting was by a startup that do pretty cool networking stuff. The use like 80% lisp, some low level C code and a tiny bit of R.

http://teclo.net/

There's a ton. I'm working at a new company and we use JazzScheme for everything, but it's a spin-off and not a startup.

The author of the original post made an angel investment in a Common Lisp-based startup after they went through YC.

ITA uses Lisp and was bought by Google for $700M.

The startup that Akamai bought that helps companies make mobile versions of their websites primarily used Clojure, and continues to do so at Akamai.

My creation, the world's best photo sharing site, primarily uses Kawa Scheme: http://ourdoings.com/

Flightcaster was using clojure as a core part of their infrastructure.

PG's Viaweb: http://en.wikipedia.org/wiki/Viaweb ...and they managed a good exit ;-)

PG's take on this subject: it's about beating the averages: http://www.paulgraham.com/avg.html

Does it have to be a _startup_?