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Brazilian nubank, they mainly use clojure

And they recently acquired Plataformatec, the company behind Elixir.

Syscog is a Portuguese company heavily focused on Lisp.

SimCorp uses Ocaml as well.

And APL. As I understand it, they have quite a bit of APL code, and only a little bit of OCaml and F# (and a crapload of C#).