Companies offer such service on a subscription basis, typically granting regular access to one's credit history, alerts of critical changes to one's credit history, and additional services.
It is often advisable to see data with all three bureaus (Equifax, Experian and TransUnion) to detect identity theft.
Likewise, TransUnion provide a premium credit reporting service with similar features.
In the United Kingdom, the Big Three credit agencies all offer this service as well as smaller bureaus.
The activities mentioned are usually the filing of latest accounts, board appointments and resignations, share capital amendments, change of company name or Registered Office address, CCJs and changes to the credit rating.