UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 13F
FORM 13F COVER PAGE
INFORMATION REQUIRED OF INSTITUTIONAL INVESTMENT MANAGERS PURSUANT
TO SECTION 13(f) OF THE SECURITIES EXCHANGE ACT OF 1934 AND RULES THEREUNDER
Report for the Calendar Year or Quarter Ended: March 31, 2009.
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Check Here if Amendment / /; Amendment Number:
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This Amendment (Check only one.): / / is a restatement.
/ / adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name: OneBeacon Insurance Group, Ltd.
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Address: 601 Carlson Parkway
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Minnetonka, Minnesota 55305
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U.S.A.
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Form 13F File Number: 028-12951
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The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.
Person Signing this Report on Behalf of Reporting Manager:
Name: Paul H. McDonough
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Title: Chief Financial Officer
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Phone: (781) 332-7000
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Signature, Place, and Date of Signing:
/s/ Paul H. McDonough Canton, Massachusetts May 8, 2009
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[Signature] [City, State] [Date]
Report Type (Check only one.):
/ / 13F HOLDINGS REPORT. (Check here if all holdings of this reporting
manager are reported in this report.)
/ / 13F NOTICE. (Check here if no holdings reported are in this report,
and all holdings are reported by other reporting manager(s).)
/X/ 13F COMBINATION REPORT. (Check here if a portion of the holdings for this
reporting manager are reported in this report and a portion are reported by
other reporting manager(s).)
List of Other Managers Reporting for this Manager:
[If there are no entries in this list, omit this section.]
No. Form 13F File Number Name
1. 028-04685 Prospector Partners, LLC
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FORM 13F SUMMARY PAGE
Report Summary:
Number of Other Included Managers: 1
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Form 13F Information Table Entry Total: 25
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Form 13F Information Table Value Total: 21,309
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(thousands)
List of Other Included Managers:
Provide a numbered list of the name(s) and Form 13F file number(s) of all
institutional investment managers with respect to which this report is filed,
other than the manager filing this report.
No. Form 13F File Number Name
1 28-N/A Copley Square Capital Management, LLC
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INVESTMENT DISCRETION VOTING AUTHORITY SHARES
NAME OF ISSUER CLASS CUSIP FAIR MV SHARES SOLE SHARED AS SHARED-OTHER SOLE SHARED NONE
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Automatic Data Proc Com 053015103 703,200 20,000 x x
Caterpillar Inc Del Com 149123101 279,600 10,000 x x
Comcast Corp New CL A Com 20030N101 545,600 40,000 x x
Colgate Palmolive Com 194162103 1,474,500 25,000 x x
CVS Caremark Corp Com 126650100 1,649,400 60,000 x x
Honda Motor ADR New AMERN SHS 438128308 948,000 40,000 x x
Honeywell Intl Inc Del Com 438516106 1,448,720 52,000 x x
Illinois Tool Works Inc Com 452308109 1,234,000 40,000 x x
Kraft Foods Inc VA CL A CL A 50075N104 557,250 25,000 x x
L-3 Communications Hldgs Com 502424104 1,695,000 25,000 x x
Marathon Oil Corp Com 565849106 788,700 30,000 x x
Monsanto Co New Del Com Com 61166W101 831,000 10,000 x x
Nucor Corporation Com 670346105 1,145,100 30,000 x x
Patriot Coal Corp Com 70336T104 3,710 1,000 x x
Peabody Energy Corp Com Com 704549104 375,600 15,000 x x
Petrleo Bras VTG SPD ADR ADR 71654V408 304,700 10,000 x x
Plum Creek Timber Co Inc Com 729251108 726,750 25,000 x x
Staples Inc Com 855030102 362,200 20,000 x x
TJX Cos Inc New Com 872540109 1,282,000 50,000 x x
Toronto Dominion Bank Com 891160509 345,800 10,000 x x
United Techs Corp Com Com 913017109 1,289,400 30,000 x x
Wellpoint Inc Com 94973V107 949,250 25,000 x x
Weyerhaeuser Co Com 962166104 275,700 10,000 x x
Yum Brands Inc Com 988498101 1,099,200 40,000 x x
3M Company Com 88579Y101 994,400 20,000 x x