Anyone who comes across my post in here, I have found a solution:
So the first issue is that yes, the creator of the database set Pride and a few others to have mandatory owners, but there were all listed as None, so no one was opening the company. The solution is to obviously change that but if you have already started a game, what I have done is I changed the name of the necessary companies and then just imported them (with the owner thing changed to preferred) and with their current opening dates, they automatically are already open (if you have passed their opening date) without any owner