The term Hartford-based health care company is referring to AETNA, a 5 letter company. AETNA is an American managed health care company that was founded in 1853 and is based in Hartford, Connecticut. It is one of the largest health care companies in the United States, providing health insurance products and related services to more than 46 million people. AETNA offers a broad range of traditional, voluntary and consumer-directed health insurance products and related services, including medical, pharmacy, dental, behavioral health, group life and disability plans, and medical management capabilities.