Exhibit 21.1
LIST OF SUBSIDIARIES OF ONEBEACON INSURANCE GROUP, LTD.
as of December 31, 2012
| Subsidiary | Jurisdiction of Incorporation | |
| A. W. G. Dewar, Inc. | Massachusetts | |
| Atlantic Specialty Insurance Company | New York | |
| The Camden Fire Insurance Association | New Jersey | |
| EBI Claims Services, LLC | Delaware | |
| The Employers’ Fire Insurance Company | Massachusetts | |
| Essentia Insurance Company | Missouri | |
| Homeland Insurance Company of Delaware | Delaware | |
| Homeland Insurance Company of New York | New York | |
| Houston General Insurance Company | Texas | |
| Houston General Insurance Exchange | Texas | |
| Houston General Insurance Management Company | Texas | |
| Mill Shares Holdings (Bermuda) Ltd. | Bermuda | |
| National Marine Underwriters, Inc. | Massachusetts | |
| The Northern Assurance Company of America | Massachusetts | |
| OBI National Insurance Company | Pennsylvania | |
| OneBeacon America Insurance Company | Massachusetts | |
| OneBeacon Entertainment, LLC | Delaware | |
| OneBeacon Holdings (Gibraltar) Limited | Gibraltar | |
| OneBeacon Insurance Company | Pennsylvania | |
| OneBeacon Insurance Group LLC | Delaware | |
| OneBeacon Investments (Luxembourg) S.à r.l. | Luxembourg | |
| OneBeacon Midwest Insurance Company | Wisconsin | |
| OneBeacon Professional Insurance, Inc. | Delaware | |
| OneBeacon Risk Management, Inc. | Delaware | |
| OneBeacon Select Insurance Company | Pennsylvania | |
| OneBeacon Services, LLC | Delaware | |
| OneBeacon Specialty Insurance Company | Pennsylvania | |
| OneBeacon Sports and Leisure, LLC | Delaware | |
| OneBeacon U.S. Enterprises Holdings, Inc. | Delaware | |
| OneBeacon U.S. Financial Services, Inc. | Delaware | |
| OneBeacon U.S. Holdings, Inc. | Delaware | |
| Potomac Insurance Company | Pennsylvania | |
| Public Entities of America, LLC | Florida | |
| Traders & General Insurance Company | Texas | |
| WM Belvaux (Luxembourg) S.à r.l. | Luxembourg | |
| WM Findel (Luxembourg) S.à r.l. | Luxembourg | |
| WM Kehlen (Luxembourg) S.à r.l. | Luxembourg | |
| WM Queensway (Gibraltar) Limited | Gibraltar | |