The corporatization of health care in the US has continued for more than four decades, with an increase in the share of for-profit companies, consolidation, and integration of different levels of health care delivery. Less than half of ambulatory practices are now independently owned, and this proportion is steadily declining. Large conglomerates such as UnitedHealthcare and CVS-Aetna control doctors, home care, pharmacies and drug managers. Consolidation enables more efficient use of human, physical and financial resources, which can contribute to better coordination of care and research. At the same time, however, there is growing concern that corporations may prioritize financial results over clinical independence and quality of care. Oregon has implemented a new law that directly regulates the influence of corporations, particularly investor-owned management companies, in the provision of health care. Critics warn that the law may inadvertently increase pressure on independent practices and encourage their absorption into large health systems.