Many businesses are rated by Dun & Bradstreet (D&B). These businesses are rated according to several factors, and will vary depending upon whether a business provides information
The highest D&B ratings reflect the company size based on net worth or equity as computed by D&B which companies have provided D&B with current financial information, The next tier of D&B ratings reflect company size based on the total number of employees, both for companies that provide current financial statements and for those that do not, a creditworthiness assessment based on both payments and financial stability which also includes an analysis of public filings, trade payments, business age and other important factors, The Financial Stress model predicts the likelihood of a firm ceasing business without paying all creditors in full, or reorganizing or obtaining relief from creditors under state/federal law over the next twelve months, The US Commercial Credit Score predicts the likelihood of a firm paying in a delinquent manner (90 + days past terms) during the next 12 months, based on the information in D&B's file.
You can find Dun & Bradstreet’s Rating Interpretation Table on their site.