Franz, Inc. provides an inexhaustive list of success stories on their website. However:
Please don’t assume Lisp is only
useful for Animation and Graphics, AI,
Bioinformatics, B2B and E-Commerce,
Data Mining, EDA/Semiconductor
applications, Expert Systems, Finance,
Intelligent Agents, Knowledge
Management, Mechanical CAD, Modeling
and Simulation, Natural Language,
Optimization, Research, Risk Analysis,
Scheduling, Telecom, and Web Authoring
just because these are the only things
they happened to list. — Kent Pitman
We can find other success stories here: http://lisp-lang.org/success/
and a list of current companies using Common Lisp: https://github.com/azzamsa/awesome-lisp-companies