HCA Healthcare, Inc., through its subsidiaries, owns and operates hospitals and related healthcare entities in the United States. It operates general and acute care hospitals that offers medical and surgical services, including inpatient care, intensive care, cardiac care, diagnostic, and emergency services; and outpatient services, such as outpatient surgery, laboratory, radiology, respiratory therapy, cardiology, and physical therapy. The company also operates outpatient health care facilities consisting of freestanding ambulatory surgery centers, freestanding emergency care facilities, urgent care facilities, walk-in clinics, diagnostic and imaging centers, rehabilitation and physical therapy centers, radiation and oncology therapy centers, physician practices, and various other facilities. In addition, it operates behavioral hospitals, which provide therapeutic programs comprising child, adolescent and adult psychiatric care, adolescent and adult alcohol, drug abuse treatment, and counseling services. The company was formerly known as HCA Holdings, Inc. HCA Healthcare, Inc. was founded in 1968 and is headquartered in Nashville, Tennessee.

Tenet Healthcare Corporation operates as a diversified healthcare services company in the United States. The company operates through two segments: Hospital Operations and Services, and Ambulatory Care. Its general hospitals offer acute care services, operating and recovery rooms, radiology and respiratory therapy services, clinical laboratories, and pharmacies. The company also provides intensive and critical care, and/or coronary care units; cardiovascular, digestive disease, neurosciences, musculoskeletal, and obstetrics services; outpatient services, including physical therapy; tertiary care services, such as cardiothoracic surgery, complex spinal surgery, neonatal intensive care, and neurosurgery services; quaternary care services in heart and kidney transplants; and limb salvaging vascular procedure, acute level 1 trauma, intravascular stroke care, minimally invasive cardiac valve replacement, imaging, surgical robotic, and telemedicine access services. In addition, it offers a range of procedures and services, such as orthopedics, total joint replacement, and spinal and other musculoskeletal procedures; gastroenterology; pain management; otolaryngology; ophthalmology; and urology. It operates hospitals, ambulatory surgery centers, imaging centers, surgical hospitals, off-campus emergency departments, and micro-hospitals. Tenet Healthcare Corporation was founded in 1967 and is headquartered in Dallas, Texas.

Universal Health Services, Inc., through its subsidiaries, owns and operates acute care hospitals, and outpatient and behavioral health care facilities. It operates through Acute Care Hospital Services and Behavioral Health Care Services segments. The company's hospitals offer general and specialty surgery, internal medicine, obstetrics, emergency room care, radiology, oncology, diagnostic and coronary care, pediatric services, pharmacy services, and/or behavioral health services. It also provides commercial health insurance services; and various management services, which include central purchasing, information, finance and control systems, facilities planning, physician recruitment, administrative personnel management, marketing, and public relations services. Universal Health Services, Inc. founded in 1978 and is headquartered in King of Prussia, Pennsylvania.

Surgery Partners, Inc., together with its subsidiaries, owns and operates a network of surgical facilities and ancillary services in the United States. The company provides ambulatory surgery centers and surgical hospitals that offer non-emergency surgical procedures in various specialties, including orthopedics and pain management, ophthalmology, gastroenterology, and general surgery. It offers diagnostic imaging, laboratory, obstetrics, oncology, pharmacy, physical therapy, and wound care; and ancillary services, including multi-specialty physician practices, urgent care facilities, and anesthesia services. In addition, it offers single- and multi-specialty facilities. Surgery Partners, Inc. was founded in 2004 and is headquartered in Brentwood, Tennessee.

Select Medical Holdings Corporation, through its subsidiaries, operates critical illness recovery hospitals, rehabilitation hospitals, outpatient rehabilitation clinics, and occupational health centers in the United States. It operates in four segments: Critical Illness Recovery Hospital, Rehabilitation Hospital, Outpatient Rehabilitation, and Concentra. The Critical Illness Recovery Hospital segment consists of hospitals that provide services for heart failure, infectious disease, respiratory failure and pulmonary disease, surgery requiring prolonged recovery, renal disease, neurological events, and trauma. The Rehabilitation Hospital segment offers therapy and rehabilitation treatments, including rehabilitative services for brain and spinal cord injuries, strokes, amputations, neurological disorders, orthopedic conditions, pediatric congenital or acquired disabilities, and cancer. The Outpatient Rehabilitation segment operates rehabilitation clinics that provide physical, occupational, and speech rehabilitation programs and services; and specialized programs, such as functional programs for work related injuries, hand therapy, post-concussion rehabilitation, pediatric and cancer rehabilitation, and athletic training services. The Concentra segment operates and provides occupational health centers, telemedicine platforms, onsite clinics, and contract services at employer worksites that deliver occupational health services, consumer health, physical therapy, and preventive care. Select Medical Holdings Corporation was founded in 1996 and is headquartered in Mechanicsburg, Pennsylvania.

Acadia Healthcare Company, Inc. provides behavioral healthcare services in the United States and Puerto Rico. The company develops and operates acute inpatient psychiatric facilities, specialty treatment facilities comprising residential recovery facilities and eating disorder facilities, comprehensive treatment centers, and residential treatment centers, as well as facilities offering outpatient behavioral healthcare services for the behavioral healthcare and recovery needs of communities. Acadia Healthcare Company, Inc. was founded in 2005 and is headquartered in Franklin, Tennessee.

Ardent Health Partners, Inc. owns and operates a network of hospitals and clinics that provides a range of healthcare services in the United States. It operates acute care hospitals, including rehabilitation hospitals and surgical hospitals. The company was founded in 2001 and is based in Brentwood, Tennessee. Ardent Health Partners, Inc. is a subsidiary of EGI-AM Investments, L.L.C.

National HealthCare Corporation engages in the operation of services to skilled nursing facilities, assisted and independent living facilities, homecare and hospice agencies, and health hospitals. Its skilled nursing facilities offer licensed therapy services, nutrition services, social services, activities, and housekeeping and laundry services, as well as medical services prescribed by physicians; and rehabilitative services, such as physical, speech, respiratory, and occupational therapy for patients recovering from strokes, heart attacks, orthopedic conditions, neurological illnesses, or other illnesses, injuries, or disabilities. The company's medical specialty units comprise memory care units and sub-cute nursing units that provide specialized care and programs for persons with Alzheimer's or related disorders; and assisted living facilities offer personal care services and assistance with general activities of daily living, such as dressing, bathing, meal preparation, and medication management. Its independent living facilities offers specially designed residential units for the active and ambulatory elderly and provide various ancillary services for residents, including restaurants, activity rooms and social areas; and behavioral health services to both adults and geriatric patients with psychiatric, emotional, and addictive disorders. In addition, the company's homecare agencies assist those who wish to stay at home or in assisted living residences but still require some degree of medical care or assistance with daily activities; hospice agencies that provides hospice and palliative care; and operates pharmacies, as well as managed care insurance solutions. Further, it offers management, accounting, and financial services; and leases its properties to third party operators. The company was founded in 1971 and is based in Murfreesboro, Tennessee.