Milhouse: Your last description about it depending on the minds of the buyer/seller would mean there’s no halachic distinction between a private business and a privately held company, your original point in the OP.
Regarding your first answer (in your last post), are you positing that we halachicly disregard Choshen Mishpat in favor of dina d’malchusa?
Regarding your second answer, the tzibur comparison is obviously inapplicable to a corporate entity with sole ownership. As such you cannot extrapolate from it to corporations in halacha, in general.