Who is in the IW US 500?

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.