Any  person or company that takes possession of refined petroleum products for the purpose of reselling those products is a petroleum marketer. This broad definition of a petroleum marketer encompasses a wide range of commercial businesses from wholesale to retail operations.

A petroleum marketer often owns gasoline stations, convenience stores, heating oil businesses, truck stops, lubricant warehouses, petroleum trucking companies and bulk storage facilities. PMAA members are independent companies operating in some or all of these businesses.