Select Medical Holdings Corp is a healthcare company that operates through four main segments: critical illness recovery hospitals, rehabilitation hospitals, outpatient rehabilitation clinics, and Concentra institutions. Critical illness recovery hospitals and rehabilitation centres are designed for patients requiring extended recovery time with medical services. These two sectors combined compose roughly half of the total revenue and include over 103 critical illness recovery hospitals and inpatient rehab facilities. The outpatient rehabilitation segment includes over 1,928 rehabilitation clinics. The Concentra segment includes over 540 occupational health centers and 147 onsite clinics. The company is headquartered in Pennsylvania, and it operates across the United States.