Hello, everyone.
I really can't see the problem with this sentence. In my opinion, it's as fine as He is a manager of our company.
Perhaps there's something I haven't noticed here?
I'd like to hear your thoughts.
Many thanks
Does your company have two or more managers or just the one?
The one in the subject line is correct, but your second example, He is a manager of our company, sounds strange to me. If there are many managers, we would not use "of" our company, but "at", "for", "in" or "with."
The genitive implies possession, meaning there is only one manager for the one company.