it does not really work that way, but for some imaginary purposes...OK.
owning company stock does
not make you a company owner, unless you own 50%+1.
you are just a minority shareholder and your rights are last in the queue if the company goes down.
as a minority shareholder you have no rights to the company other assets, again, unless there is a bankruptcy, and you are the last in line, usually getting nothing or close to nothing.
TL;DR no, WB does not own any bitcoin in the scenario described above.
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