Kind of amazing they are still a going business. I didn't realise any companies really used lisp for anything. I assume whoever is paying them money is doing so for some really niche or legacy?
I am a current LispWorks customer using the product for new product development. I wouldn’t consider my usage niche, but then again, I am not sure what you may consider to be niche or not.
I did some work for a machine translation business that used Common Lisp as their "secret sauce". As they considered it a serious competitive advantage, you wouldn't hear about it anywhere.
I've seen this with quite a few other companies since, but that means that lots of companies could be using lisp and nobody would ever know about it.
By niche, I assume you mean niche interest rather than niche purpose. They're both general-purpose languages that are usable on the latest OSes, after all.