Company Information Company History: Ohio Security Insurance Company was incorporated in 1950 and became a part of the Ohio Casualty Group in 1962. The ultimate parent of the group of companies is a publicly traded holding company, Ohio Casualty Corporation. Ohio Security's business is largely (95%) from workers' compensation with most of the remaining premiums coming from private passenger auto liability insurance. Ohio Security's direct premiums written in 2005 totaled $16.3 million with Pennsylvania accounting for 23.7%, Maryland 23.0%, ...