Sadly, no. It's a list of the top 500 publicly-held companies in the US, based on rankings by Fortune magazine. It's a boring magazine about making money.
My superiors feel it is imperative to know how many of the clients on my 800+client list are included in the Fortune 500. So, I had to look them up individually, because I didn't have a list I could just scan.
IT WAS VERY SAD, I TELL YOU!