Hmm.. Who are your corporate overlords, languages?
Rust (4 of big 5 tech)
https://foundation.rust-lang.org/members/
Julia (3 of the big 5 tech)
https://juliacomputing.com/
LLVM (3 of big 5 tech)
https://foundation.llvm.org/docs/sponsors/
Haskell (1 of big 5 tech)
https://haskell.foundation/
Ocaml (financial companies)
https://ocaml-sf.org/
Zig (individuals)
https://github.com/sponsors/ziglang
D (1 financial firm + individuals)
https://dlang.org/foundation/sponsors.html
R (researchers and universities)
https://www.r-project.org/foundation/donors.html
@jmw150 then it's four, only Facebook is absent.