Historical stock prices for Amerigroup Corp. (AGP). AMERIGROUP Corporation is a multi-state managed healthcare company focused on serving people who receive healthcare benefits through publicly funded healthcare programs, including Medicaid, Children's Health Insurance Program (CHIP), Medicaid expansion programs and Medicare Advantage. The Company offers a continuum of care management, including disease management, pharmacy integration, centralized telephonic case management, in-person case management within healthcare facilities, and home visit case management for some of its members. As of December 31, 2011, the Company provided a number of healthcare products to approximately 2,024,000 members in Texas, Florida, Georgia, Maryland, Tennessee, New Jersey, New York, Nevada, Ohio, Virginia and New Mexico. Effective February 1, 2012, it provides managed care services in Louisiana. On May 1, 2012, it acquired Health Plus.