APL came out a LONG time ago and was sold by IBM for awhile. If you look for Dyalog's customers you'll see some recognizable names. Volvo has their entire inventory system in Dyalog APL or something like that if iirc. Kdb+ is used a good bit on Wall Street and also by F1 racing and a few other places. I'm sure J is in use somewhere, but it's probably a bit rarer.

https://www.dyalog.com/case-studies/hercules.htm