Satellites used to be owned almost exclusively by governments. These days, that is seldom the case. Satellite owners now tend to be corporations - either private ones or publicly listed companies.
Their websites (where they have them) can sometimes be useful sources of information - "sometimes" being the operative word. Their sites have varying degrees of information. The frequency of their updating can also vary a great deal. But nonetheless, they're worth checking out once in a while - and, if you're lucky, they may even answer your email!