Yes! https://v3.ocaml.org/users has a list some of industrial users. The list might not be as large as say for languages like Rust, but its more than just Janestreet :)

Personally, I've also been lucky enough to have worked for two different employers (not in the finance or compiler space) over the past 2 years where I've mostly used OCaml for writing things that many people might consider "boring", namely lots of web services, database drivers, data processing, etc.

Facebook, Bloomberg, Citrix, Docker and a handful of others featured on their website[1]. I'm sure there are others that are quietly using it.

[1]https://ocaml.org/learn/companies.html