Atlantic Casualty Insurance Company (Atlantic Casualty) was formed by Strickland Insurance Group (SIG) in 1983 to underwrite a substantial book of non-standard personal auto. By the late 1990's, the book had grown to over $100 million of premium in seven states. In 1998 the decision was made to refocus the company in commercial products. Our current product lines include Commercial General Liability, Commercial Package, Inland Marine, Commercial Property, Boiler and Machinery and Commercial Auto (NC only). These products are distributed exclusively through Managing General Agencies. . In January of 2016, Atlantic Casualty and SIG were acquired and became part of the Auto-Owners Insurance Group. Auto-Owners Insurance Group has been in business for 100 years and has been ranked among the Fortune 500 for the past 13 years. Written premium for the group is over $6 billion with an A.M. Best rating of A++ (Superior).