The Consumer Financial Protection Bureau (CFPB) listed specialty consumer reporting companies which are required to give consumers an easy way to get a free copy of their reports every 12 months. Here's how the CFPB blog post described these companies:
These are companies that collect information on a nationwide basis about medical records or payments, residential or tenant history, check-writing history, employment history, or insurance claims. Like the three largest nationwide consumer reporting companies (Experian, Equifax, and TransUnion), they gather and report information about you to creditors, landlords, insurance companies, employers, and others.
The specialty consumer reporting company that most affects savers is Chex Systems which banks use in their account application process. You can request one free Chex System report every 12 months at ConsumerDebit.com
You can see all of these specialty consumer reporting companies in this CFPB document