Select Medical Holdings Corp. engages in the provision of medical rehabilitation services. The company is headquartered in Mechanicsburg, Pennsylvania and currently employs 37,800 full-time employees. The company went IPO on 2009-09-25. The firm operates through four business segments: Critical Illness Recovery Hospital, which consists of hospitals that serves the needs of patients recovering from critical illnesses; Rehabilitation Hospital, which consists of hospitals that serves patients that require intensive physical rehabilitation care; Outpatient Rehabilitation, which consists of clinics that provide physical, occupational, and speech rehabilitation services, and Concentra, which consists of occupational health centers that provides workers’ compensation injury care, physical therapy, and consumer health services and onsite clinics. The company operates approximately 103 critical illness recovery hospitals in 28 states, 31 rehabilitation hospitals in 12 states, and over 1,928 outpatient rehabilitation clinics in 39 states.