So if D&B's financial evaluation of a company is 5A 1. What does this mean?

5A 1 can be divided into two parts. "5A" stands for the size of the company, which is basically different from net assets and registered capital. Generally, large listed companies can reach the "5A" rating. The following number "1" is the credit score, and 1-4 stands for "excellent", "good", "fair" and "poor" respectively. Therefore, even the ratings of 4A or even B, C and D, followed by "1", indicate that the credit rating is excellent. It's just that the companies are different in size.