Would you say…
Johnson & Johnson wish you a happy birthday
Johnson & Johnson wishes you a happy birthday
I don't believe these are complete sentences and have read that a company really should be more formal when trying to send a message because a company can't really wish as it is not a person.
Maybe something along the lines of…
All of us at Johnson & Johnson would like to wish you a happy birthday
I am just trying to find a short correct way of stating this.