Answer

The Fortune 500 is an annual list compiled and published by Fortune magazine that ranks 500 of the largest United States corporations by total revenue for their respective fiscal years. The list includes publicly held companies, along with privately held companies for which revenues are publicly available. 

Go to the Virtual Business Library's Company & Financial Information section for links to useful resources including a link to the following suggested resource.

Hoovers: Provides rankings data for an individual company, including their Fortune 500 rank. It also provides a link to the Fortune website. 

You may also want to go to the Fortune website, Fortune 500 or go to the Virtual Business Library's Journals/Newspapers/E-Books section and search in the database Business Source Complete.  Generally, the Fortune 500 issue is published in April.