I dont think there is a maximum of owners of a private company, but you would propably be the owner of stock in a public fund, that owns stock in a private comp

I dont think there is a maximum of owners of a private company, but you would propably be the owner of stock in a public fund, that owns stock in a private company called Tesla. You would no longer get quarterly reports, but propably various updates, and a yearly report (my best guess).