Rich can be in the eye of the beholder. Companies like Apple have a huge market capitalization—which is the total value of all the outstanding shares of stock for a company—but don't do near as much business as other companies. Since the market cap has to do with stock value, it's only tangentially related to the actual wealth of the company. Kind of like saying that Tiger Woods' ability to sell video games makes him the best golfer in the world. The “Fortune” 500 list uses a better approach that balances factors like revenue, assets and market cap.