Banter and General Comments, page-4746

Borrowed shares remain registered to asset holder as do the votes.
When you borrow shares, they are not registered or transfered into your name.
So when you hold 100 shares and borrow 100 shares, you are physically registering 100 shares to your name.
However, when you sell 100 borrowed shares to a 3rd entity, they are registered into their name (pretty much as new share)

Once you buy shares they still don't go onto your register as they are marked as "return of borrowed stock" and removed from the register.

So no, in the whole process you won't register as having a change in your substantial holding as the borrowed and returned stock was never registered as your holding.

What exactly are you doing for living?