The Andover Companies | 12,847 followers on LinkedIn. Committed to providing the highest quality insurance products & services to meet the needs of our customers and agents. | We Are The Andover Companies In 1828, a group of prominent town leaders in Andover, Massachusetts, met at a neighborhood tavern to determine how to financially protect local properties from fire. This meeting of the minds led to the creation of an insurance company, owned entirely by its policyholders. Today, we are The Andover Companies, one of the largest and longest-standing mutual insurance groups in the Northeast.