There are tons, I can name at least 4 in my city alone, all fintech. Elixir really excels, and is heavily used, at payment processing workflows, where genservers and the concurrency model is amazingly useful at handling complex, multi-step transactions involving multiple, often external, actors.

None of the companies appear on that list, I think those kinds of things should always be taken with a grain of salt.

There's a pretty large list here: https://elixir-companies.com

Some case studies of Elixir's use at various companies can be found on the main Elixir site.[0]

[0] https://elixir-lang.org/cases.html

Based on the customer list of Oban.pro and knowledge from previous conferences there's also Nintendo (one of their online game stores uses it?), PepsiCo, Apple, Toyota...

Discord uses it for their backend I think. Interestingly WhatsApp's backend is also built on Beam, but using Erlang directly instead.

Adobe and Apple.