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updated Apr 28, 2022. The top health insurers by market share are UnitedHealth Group, Anthem, Centene, Humana and Health Care Service Corp. (HCSC). Together these companies control nearly 46% of the health insurance market. All of these providers offer basic health insurance products to individuals and companies, along with other services that can include Medicaid and Medicare policies, long-term care insurance, dental insurance and vision benefits.