There is no concept of a "corperate account" for FormsCentral, each user would have their own subscription. The closest we've had was something called "Team Admin" where you could purchase a pack of subscriptions under one users name and they could administer those accounts granting access to other users. The Team Admin method of purchase is no longer available but it is possible your company purchased a Team Admin account.
Do you know what email address would have been used if a Team Admin account was purchased? There would be one "master" account.