Mergent Horizon includes companies' bond ratings.

• Search for your company
• Then click the portraits tab to find corporate bond portraits and bond ratings.

LexisNexis Academic has bond ratings too.

• Use the "find company info" box to search for a company by name or ticker symbol.
• Then, on the "company dossier" view, scroll down to find the company's bond rating/

You might also wish to use Bloomberg, available in the Margolis Market Information Lab.

• Type the ticker symbol for the company you want
• Hit the CORP key
• Then type CRPR and hit the GO key.
• You can find historical bond ratings for particular issues.

WRDS is also available in the Margolis Market Information Lab.

• Choose Compustat
• Scroll to Ratings Xpress
• Choose your ratings category