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 (formerly American Central 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 Insurance Group, Ltd.
- OneBeacon Lloyd's, Inc.
- OneBeacon Professional Partners, Inc.
- OneBeacon Risk Management, Inc.
- OneBeacon Sports and Leisure, LLC
- OneBeacon U.S. Enterprises Holdings, Inc.
- OneBeacon U.S. Financial Services, Inc.
- OneBeacon U.S. Holdings, Inc.
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