EX-21.0 9 wtm-20121231x10xkxex21.htm EXHIBIT 21
Exhibit 21
SUBSIDIARIES OF THE REGISTRANT
AS OF DECEMBER 31, 2012

FULL NAME OF SUBSIDIARY | PLACE OF INCORPORATION
CENTRAL NATIONAL INSURANCE COMPANY OF OMAHA | NEBRASKA, USA
SIRIUS INTERNATIONAL HOLDING COMPANY, INC. | NEW YORK, USA
SIRIUS AMERICA INSURANCE COMPANY | NEW YORK, USA
FUND AMERICAN HOLDINGS AB | SWEDEN
GUILFORD HOLDINGS, INC. | DELAWARE, USA
HOMELAND INSURANCE COMPANY OF DELAWARE | DELWARE, USA
LONE TREE HOLDINGS LTD. | BERMUDA
MILL SHARES HOLDINGS BERMUDA LIMITED | BERMUDA
ONEBEACON U.S. ENTERPRISES HOLDINGS, INC. | DELAWARE, USA
ONEBEACON U.S. FINANCIAL SERVICES, INC. | DELAWARE, USA
ONEBEACON U.S. HOLDINGS, INC. | DELAWARE, USA
ONEBEACON AMERICA INSURANCE COMPANY | MASSACHUSETTS, USA
ONEBEACON HOLDINGS (GIBRALTAR) LIMITED | GIBRALTAR
S.I. HOLDINGS (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
ONEBEACON INSURANCE COMPANY | PENNSYLVANIA, USA
ATLANTIC SPECIALTY INSURANCE COMPANY | NEW YORK, USA
ONEBEACON INSURANCE GROUP LLC | DELAWARE, USA
ONEBEACON INSURANCE GROUP LTD. | BERMUDA
ONEBEACON INVESTMENTS (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
PSC HOLDINGS LTD. | BERMUDA
SIRIUS INSURANCE HOLDING SWEDEN AB | SWEDEN
SIRIUS INTERNATIONAL INSURANCE CORPORATION | SWEDEN
THE NORTHERN ASSURANCE COMPANY OF AMERICA | MASSACHUSETTS, USA
WHITE MOUNTAINS ADVISORS LLC | DELAWARE, USA
WHITE MOUNTAIN HOLDING (NL)B.V. | NETHERLANDS
WHITE MOUNTAINS HOLDINGS (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WHITE MOUNTAINS INTERNATIONAL S.A.R.L. | LUXEMBOURG
WHITE MOUNTAINS INVESTMENTS BERMUDA LTD. | BERMUDA
WHITE MOUNTAINS LIFE REINSURANCE (BERMUDA) LTD. | BERMUDA
SIRIUS INTERNATIONAL FINANCIAL SERVICES LTD. | BERMUDA
SIRIUS INTERNATIONAL GROUP, LTD. | BERMUDA
SIRIUS RE HOLDINGS, INC. | DELAWARE, USA
SIRIUS INTERNATIONAL HOLDINGS, LTD. | BERMUDA
SIRIUS INTERNATIONAL INSURANCE GROUP, LTD. | BERMUDA
WHITE MOUNTAINS RE UNDERWRITING SERVICES LTD | BERMUDA
WHITE ROCK HOLDINGS (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WHITE SANDS HOLDINGS (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM ALAMEDA (GIBRALTAR) LIMITED | GIBRALTAR
WM BECH (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM BELVAUX (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM CALETA (GIBRALTAR) LIMITED | GIBRALTAR
WM CLAY (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM CUMBERLAND (GIBRALTAR) LIMITED | GIBRALTAR
WM FINDEL (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM KAOLIN (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM KEHLEN (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM LAGUNA (GIBRALTAR) LIMITED. | GIBRALTAR
WM LIMESTONE (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM LINGER (LUXEMBOURG) S.A.R.L. | LUXEMBOURG

WM MERL (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM MONTAGU (GIBRALTAR) LIMITED | GIBRALTAR
WM OLM (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM QUEENSWAY (GIBRALTAR) LIMITED | GIBRALTAR
WM REULER (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM VIANDEN (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WM PHOENIX (LUXEMBOURG) S.A.R.L. | LUXEMBOURG
WHITE SHOALS RE LTD. | BERMUDA
WHITE MOUNTAINS RE SIRIUS CAPITAL LTD. | UNITED KINGDOM
WHITE MOUNTAINS RE UNDERWRITING SERVICES AMERICA LLC. | NEW YORK, USA
SIRIUS GLOBAL SERVICES LLC. | DELAWARE, USA
WHITE MOUNTAINS SPECIALTY UNDERWRITING, INC. | CONNECTICUT, USA
WHITE MOUNTAINS SOLUTIONS HOLDINGS COMPANY | CONNECTICUT, USA
WHITE MOUNTAINS SOLUTIONS INC | CONNECTICUT, USA
SIRIUS INTERNATIONAL HOLDINGS (NL)B.V. | NETHERLANDS
STAR RE LTD | BERMUDA
BRIDGE HOLDINGS (BERMUDA) LTD | BERMUDA
WHITE MOUNTAINS CAPITAL, INC | DELAWARE, USA
WHITE MOUNTAINS FINANCIAL SERVICES LLC | DELAWARE, USA
WHITE MOUNTAINS SERVICES LLC | DELAWARE, USA
ONEBEACON SERVICES LLC | DELAWARE, USA
SYA INSURANCE HOLDINGS (NL)B.V. | NETHERLANDS
HG GLOBAL LTD | BERMUDA
HG HOLDINGS LTD | BERMUDA
HG SERVICES LTD | BERMUDA
HG RE LTD | BERMUDA
HG (GIBRALTAR) LIMITED | GIBRALTAR
HGR (GIBRALTAR) LIMITED | GIBRALTAR
HG ROOSEVELT (LUXEMBOURG) S.A.R.L | LUXEMBOURG
HGR PATTON (LUXEMBOURG) S.A.R.L | LUXEMBOURG
WHITE MOUNTAINS INVESTMENTS (LUXEMBOURG) S.A.R.L | LUXEMBOURG
TLP HOLDINGS (GIBRALTAR) LIMITED | GIBRALTAR
TLP HOLDINGS (LUXEMBOURG) S.A.R.L | LUXEMBOURG
AMERICAN GENERAL PROPERTY INSURANCE COMPANY | TENNESSEE, USA
PHYSICIAN’S INSURANCE COMPANY OF OHIO | OHIO, USA
CITATION INSURANCE COMPANY | CALIFORNIA, USA
AMERICAN GENERAL INDEMNITY COMPANY | ILLINOIS, USA

Certain other subsidiaries of the Company have been omitted since, in the aggregate, they would not constitute a significant subsidiary.