Oak Street Health, Inc. engages in the ownership and operation of primary care centers. The company is headquartered in Chicago, Illinois and currently employs 5,500 full-time employees. The company went IPO on 2020-08-06. The firm operates primary care centers serving Medicare beneficiaries. The Company, through its centers and management services organization, combines a care model with patient experience. The firm invests resources in primary care to prevent unnecessary acute events and manage chronic illnesses. The company engages Medicare-eligible patients using a community outreach approach. Once patients are engaged, it integrates population health analytics, social support services, and primary care into the care model. The company operates through its direct and indirect subsidiaries, primarily Oak Street Health MSO, LLC (OSH MSO). OSH MSO operates as a management services organization and is in the business of providing management and other administrative services to its affiliated physician practice organizations. The company operates approximately 170 centers across 21 states.