Company Information Company History: American United Mutual Insurance Holding company is the ultimate parent company of, Indiana based, OneAmerica Financial Partners, Inc and its subsidiary Pioneer Mutual Life Insurance Company, based in Fargo, North Dakota. The mutual holding company structure was created in 2000 and Pioneer was merged into the mutual holding company in 2002. OneAmerica has three principal business units: Retirement Services (60% of premium income), Individual Operations (25%) and Group Operations (15%). Pioneer's primary ...