I use OCaml at work. We work with the Binary Analysis Platform https://github.com/BinaryAnalysisPlatform/bap https://github.com/BinaryAnalysisPlatform/bap which

I use OCaml at work. We work with the Binary Analysis Platform https://github.com/BinaryAnalysisPlatform/bap https://github.com/BinaryAnalysisPlatform/bap which is a pretty essential part of what we do. In general, OCaml seems somewhat popular in the area of compilers and program analysis. Facebook Infer is written in OCaml for example https://fbinfer.com/ https://fbinfer.com/. This may be as you said because of these areas sometimes more academic flavor. There are companies out there using OCaml for all sorts of things, although of course it is a small fraction of those using python or C++.