The IW U.S. 500 includes:
- Manufacturing companies with a majority of their business in a manufacturing industry.
- Companies that generated less than 50% of revenues from manufacturing, but more revenue from manufacturing than the lowest-revenue-producing companies on this year’s list.
- Oil and gas companies that derive at least 50% of their revenues from the refining of oil and gas products.
- Companies that derive at least 50% of their revenues from the manufacture of mined materials.