It is a US magazine which ranks the top 500 US co-operations in public and private sector by estimating their gross revenue after making an estimation of the money paid in the form of taxes. The magazine was first published in 1955. Walmat is the largest company on this list in 2007 and 08 with Exxon mobile securing the 2nd place. However, in 2009 this mobile company claimed the number one spot on this list. But this was just once in a blue moon as till to date Walmat is the one which has remained stable on the top most spot since then. There are also other versions of this magazine like fortune 1000, 100 and 50. Where 1000 deals with very small groups which have the greatest fluctuation rate, followed by fortune 100 which depicts relatively stable trends of energy sector, mining and manufacturing industry. Lastly, fortune 50 which keeps a close eye on the commercial banks and insurance organizations.