REX American Resources Corp is a U.S.-based investment holding company that is engaged in ethanol production through its holdings in several facilities. The company owns a majority interest in One Earth Energy, a company that operates ethanol in Illinois. In addition, it holds a nearly 100% stake in NuGen Energy, another ethanol producer. REX American Resources also owns a minority ownership interests in Big River Resources, which owns ethanol production entities in Iowa, Illinois, and Wisconsin.