> There is an argument to be made here though when said owner is another corporate entity - that is not a person so maybe it doesn't deserve any privacy.

Agree on that point.

One argument I muster for the general case: say you disagree politically with a billionaire and don't wish to give them any money, if you don't know what companies they own: how can you act effectively in market actions with limited information? such an arrangement systemically gives power to the owner class compared to the consumer class on every exchange made between the two. We should strive for something fairer, something more open. And we should not be terrorized by the limited few deranged bad faith/violent actors.