No. The LLVM foundation is.
By numbers, Apple probably isn't even the largest contributor anymore (but this is just a guess based on mailing list traffic)
The LLVM project as a whole has many contributors from many different companies working on things they care about and contributing it back to the community.
DannyBee|11 years ago
bla2|11 years ago
zturner|11 years ago
ossreality|11 years ago
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