This seems overly redundant, especially if their name is in the package name. I don't see any benefits of adding their name to every single file. It's just going to make file names, class names, etc. longer and you'll have to mentally ignore the first word of every class name to see the class's real name. I wouldn't recommend this at all.
The only time I would add such information is if I have two similar classes, one for company A and one for company B (or replace company with library, etc.), which would cause need for such a distinction.