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You can also look for companies doing Clojure a Lisp on JVM. You can view a list here http://dev.clojure.org/display/community/Clojure+Success+Sto...

Here is a list of succesful companies using Allegro Common Lisp:

[Note: I don't know if it's up-to-date and how significant is actually common lisp in those companies codebases.]

Also as a side note, Reddit is no longer using lisp, they are using python.

Here's a list of companies using Lisp in production: http://www.pchristensen.com/blog/lisp-companies/ . pg also has a list of Lisp applications: http://paulgraham.com/apps.html

Ask HN: Who's using Lisp today?