Maas Companies, headquartered in Rochester, MN is an international marketing company specializing in the sale of biomass, biodiesel and ethanol plants and equipment. In business since 1920, we pride ourselves on being the leader in client satisfaction. We are experienced in customizing successful marketing plans that will market surplus assets for maximum price recovery. We utilize top industry consultants and engineers from around the world. Maas Companies has sold more biomass, ethanol and biodiesel plants with related equipment than any other company in the U.S. Therefore, we have a unique clientele of buyers from which to draw.