OneBeacon conducts business in all 50 states. In Rhode Island, the company operates under the OBI Insurance brand.

OneBeacon Insurance Companies

• Atlantic Specialty Insurance Company
• AutoOne Insurance Company
• AutoOne Select Insurance Company
• The Camden Fire Insurance Association
• The Employers' Fire Insurance Company
• Essentia Insurance Company
• Homeland Insurance Company of New York
• Houston General Insurance Company
• Houston General Insurance Exchange
• The Northern Assurance Company of America
• OneBeacon America Insurance Company
• OneBeacon Insurance Company
• OneBeacon Lloyd's of Texas
• OneBeacon Midwest Insurance Company
• Pennsylvania General Insurance Company
• Potomac Insurance Company
• Traders & General Insurance Company

Insurance Agencies

• A. W. G. Dewar, Inc.
• AutoOne Insurance Agency, Inc.
• National Marine Underwriters, Inc.
• TCH Insurance Agency, Inc.

Other Companies

• AutoOne Management Company, Inc.
• Houston General Insurance Management Company
• OneBeacon Entertainment, LLC
• OneBeacon Insurance Group, LLC
• OneBeacon Lloyd's, Inc.
• OneBeacon Professional Insurance, Inc.
• OneBeacon Risk Management, Inc.
• OneBeacon Services, LLC
• OneBeacon Sports and Leisure, LLC
• OneBeacon U.S. Enterprises Holdings, Inc.
• OneBeacon U.S. Financial Services, Inc.
• OneBeacon U.S. Holdings, Inc.