High Quality Content by WIKIPEDIA articles! Amerigroup (NYSE: AGP) is a health insurance company headquartered in Virginia Beach, Virginia. It is the largest publicly-traded company focused exclusively on meeting the needs of those enrolled in publicly-funded healthcare programs such as Medicaid and Medicare. In 1994, Amerigroup was founded to respond to the growing need for private-sector partners in states managing healthcare programs for lower-income families and people with disabilities.