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First of all, what’s “ancient”? As in “Ancient Greece”? Assuming you meant “historical” instead:
People do. Not companies. Why do you think a Stradivari violin is called that? Because Stradivari built it. So if you want an instrument like that, it stands to reason that you use the same process.
I just learned from another comment that these people are called luthiers. Some still exist.
razorcandy@discuss.tchncs.de 5 days ago
My guess is that many ancient instruments would be custom ordered from a luthier or other craftsman who specializes in a specific group of instruments. It would help to know which instrument you are looking for or which region it comes from.