Edgar Filing: OneBeacon Insurance Group, Ltd.

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the period ended June 30, 2011

o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 1-33128

ONEBEACON INSURANCE GROUP, LTD.

(Exact name of Registrant as specified in its charter)

Bermuda		98-0503315
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)

601 Carlson Parkway Minnetonka, Minnesota		55305
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (952) 852-2431

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months, and (2) has been subject to such filing requirements for the past 90 days. Yes x No o

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files). Yes x No o

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer o		Accelerated Filer x

Non-accelerated filer o		Smaller reporting company o

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No x

As of July 29, 2011, 23,313,719 Class A common shares, par value of $0.01 per share, and 71,754,738 Class B common shares, par value of $0.01 per share, were outstanding.

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ONEBEACON INSURANCE GROUP, LTD.

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PART I	FINANCIAL INFORMATION

ITEM 1.	Financial Statements (Unaudited)

	Consolidated Balance Sheets: As of June 30, 2011 and December 31, 2010	2

	Consolidated Statements of Operations and Comprehensive Income: Three and six months ended June 30, 2011 and 2010	3

	Consolidated Statements of Common Shareholders’ Equity: Six months ended June 30, 2011 and 2010	4

	Consolidated Statements of Cash Flows: Six months ended June 30, 2011 and 2010	5

	Notes to Consolidated Financial Statements	6

ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	31

	Results of Operations —For the three and six months ended June 30, 2011 and 2010	33

	Liquidity and Capital Resources	48

	Critical Accounting Estimates	52

	Forward-Looking Statements	53

ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk	54

ITEM 4.	Controls and Procedures	54

PART II	OTHER INFORMATION

ITEM 1.	Legal Proceedings	54

ITEM 1A.	Risk Factors	54

ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	55

ITEM 6.	Exhibits	55

SIGNATURES		56

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PART 1. FINANCIAL INFORMATION

ITEM 1. Financial Statements

ONEBEACON INSURANCE GROUP, LTD.

CONSOLIDATED BALANCE SHEETS

	June 30,		December 31,
	2011		2010
	(Unaudited)
	(in millions, except share and per share amounts)
Assets
Investment Securities:
Fixed maturity investments, at fair value (amortized cost $2,171.9 and $2,359.7)	$	2,228.5	$	2,415.5
Short-term investments, at amortized cost (which approximates fair value)	116.2		300.0
Common equity securities, at fair value (cost $253.8 and $237.2)	304.7		285.3
Convertible bonds, at fair value (amortized cost $74.2 and $82.2)	79.8		93.8
Other investments	158.3		171.4
Total investments	2,887.5		3,266.0
Cash	31.3		33.6
Reinsurance recoverable on unpaid losses	1,825.9		1,893.2
Reinsurance recoverable on paid losses	16.2		44.5
Premiums receivable	276.9		275.0
Deferred acquisition costs	119.2		114.5
Ceded unearned premiums	26.2		113.9
Net deferred tax asset	90.8		101.2
Investment income accrued	15.8		19.4
Accounts receivable on unsettled investment sales	7.3		5.4
Other assets	276.4		300.0
Total assets	$	5,573.5	$	6,166.7
Liabilities
Loss and LAE reserves	$	3,131.5	$	3,295.5
Unearned premiums	570.0		627.5
Debt	269.7		419.6
Ceded reinsurance payable	51.0		149.3
Accounts payable on unsettled investment purchases	23.6		14.1
Other liabilities	356.5		411.8
Total liabilities	4,402.3		4,917.8
OneBeacon’s common shareholders’ equity and noncontrolling interests
OneBeacon’s common shareholders’ equity:
Common shares and paid-in surplus (par value $0.01; authorized, 200,000,000 shares; issued and outstanding, 95,068,457 and 94,416,477 shares)	1,001.2		1,000.5
Retained earnings	150.7		228.2
Accumulated other comprehensive income, after tax:
Other comprehensive income and loss items	0.4		0.3
Total OneBeacon’s common shareholders’ equity	1,152.3		1,229.0
Total noncontrolling interests	18.9		19.9
Total OneBeacon’s common shareholders’ equity and noncontrolling interests	1,171.2		1,248.9
Total liabilities, OneBeacon’s common shareholders’ equity and noncontrolling interests	$	5,573.5	$	6,166.7

See Notes to Consolidated Financial Statements.

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ONEBEACON INSURANCE GROUP, LTD.

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

(Unaudited)

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions, except per share amounts)
Revenues
Earned premiums	$	265.0		$	428.3		$	528.5		$	881.5
Net investment income	18.7			25.0			39.7			53.3
Net realized and unrealized investment gains (losses)	11.0			(14.4		)	34.1			28.0
Net other expenses	(11.5		)	(10.0		)	(10.7		)	(10.8		)
Total revenues	283.2			428.9			591.6			952.0
Expenses
Loss and LAE	151.8			261.9			296.4			595.6
Policy acquisition expenses	55.4			91.3			106.4			188.8
Other underwriting expenses	47.5			58.5			99.9			132.7
General and administrative expenses	2.6			3.0			4.9			7.3
Interest expense on debt	6.0			7.9			12.3			17.0
Total expenses	263.3			422.6			519.9			941.4
Pre-tax income	19.9			6.3			71.7			10.6
Income tax (expense) benefit	(3.9		)	2.8			(13.4		)	(1.2		)
Net income including noncontrolling interests	16.0			9.1			58.3			9.4
Less: Net income attributable to noncontrolling interests	(0.5		)	(0.5		)	(0.9		)	(0.8		)
Net income attributable to OneBeacon’s common shareholders	15.5			8.6			57.4			8.6
Change in other comprehensive income and loss items	—			—			0.1			0.2
Comprehensive income attributable to OneBeacon’s common shareholders	$	15.5		$	8.6		$	57.5		$	8.8

Earnings per share attributable to OneBeacon’s common shareholders — basic and diluted
Net income attributable to OneBeacon’s common shareholders	$	0.16		$	0.09		$	0.61		$	0.09

Dividends declared and paid per OneBeacon’s common share	$	1.21		$	0.21		$	1.42		$	0.42

See Notes to Consolidated Financial Statements.

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ONEBEACON INSURANCE GROUP, LTD.

CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS’ EQUITY

(Unaudited)

	OneBeacon’s Common Shareholders’ Equity
	Common shareholders’ equity			Common shares and paid-in surplus		Retained earnings			Accum. other comprehensive income, after tax		Noncontrolling interests, after tax
	($ in millions)

Balances at January 1, 2011	$	1,229.0		$	1,000.5	$	228.2		$	0.3	$	19.9
Net income	57.4			—		57.4			—		0.9
Amortization of restricted share and option awards	0.4			0.4		—			—		—
Issuance of common shares	0.3			0.3		—			—		0.3
Repurchases and retirements of common shares	—			—		—			—		(1.3		)
Dividends	(134.9		)	—		(134.9		)	—		(0.9		)
Other comprehensive income, after tax	0.1			—		—			0.1		—
Balances at June 30, 2011	$	1,152.3		$	1,001.2	$	150.7		$	0.4	$	18.9

	OneBeacon’s Common Shareholders’ Equity
	Common shareholders’ equity			Common shares and paid-in surplus			Retained earnings			Accum. other comprehensive (loss) income, after tax			Noncontrolling interests, after tax
	($ in millions)

Balances at January 1, 2010	$	1,429.0		$	1,009.7		$	425.5		$	(6.2	)	$	19.1
Net income	8.6			—			8.6			—			0.8
Amortization of option awards	0.5			0.5			—			—			—
Issuance of common shares	0.4			0.4			—			—			0.3
Repurchases and retirements of common shares	(5.9		)	(5.9		)	—			—			—
Dividends	(39.9		)	—			(39.9		)	—			(0.7		)
Contributions	—			—			—			—			0.5
Distributions	—			—			—			—			(0.9		)
Other comprehensive income, after tax	0.2			—			—			0.2			—
Balances at June 30, 2010	$	1,392.9		$	1,004.7		$	394.2		$	(6.0	)	$	19.1

See Notes to Consolidated Financial Statements.

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ONEBEACON INSURANCE GROUP, LTD.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Six months ended June 30,
	2011			2010
	($ in millions)
Cash flows from operations:
Net income including noncontrolling interests	$	58.3		$	9.4
Charges (credits) to reconcile net income to cash flows used for operations:
Net realized and unrealized investment gains	(34.1		)	(28.0		)
Net other realized losses	11.7			10.8
Deferred income tax expense	10.3			1.4
Other operating items:
Net change in loss and LAE reserves	(164.0		)	(76.9		)
Net change in unearned premiums	(57.5		)	(44.4		)
Net change in ceded reinsurance payable	(98.3		)	135.9
Net change in ceded unearned premiums	87.7			(121.6		)
Net change in premiums receivable	(1.9		)	5.2
Net change in reinsurance recoverable on paid and unpaid losses	95.6			65.6
Net change in other assets and liabilities	(25.2		)	(11.1		)
Net cash used for operations	(117.4		)	(53.7		)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	183.9			(517.0		)
Maturities of fixed maturity investments	303.9			809.0
Sales of fixed maturity investments	809.9			512.1
Sales of common equity securities	28.1			37.1
Sales of convertible bonds	29.5			67.4
Distributions and redemptions of other investments	26.6			0.6
Purchases of fixed maturity investments	(915.0		)	(481.2		)
Purchases of common equity securities	(40.6		)	(87.8		)
Purchases of convertible bonds	(16.3		)	(27.7		)
Contributions for other investments	(3.1		)	(32.6		)
Net change in unsettled investment purchases and sales	7.6			44.4
Net acquisitions of property and equipment	(2.9		)	(1.2		)
Net cash provided from investing activities	411.6			323.1
Cash flows from financing activities:
Repayment of debt	—			(14.0		)
Repurchases of debt	(161.6		)	(197.3		)
Cash dividends paid to common shareholders	(134.9		)	(39.9		)
Repurchases and retirements of Class A common shares	—			(5.9		)
Net cash used for financing activities	(296.5		)	(257.1		)
Net (decrease) increase in cash during period	(2.3		)	12.3
Cash reclassified to assets held for sale	—			(9.1		)
Net (decrease) increase after reclassification of cash to assets held for sale	(2.3		)	3.2
Cash balance at beginning of period	33.6			44.8
Cash balance at end of period	$	31.3		$	48.0

Supplemental cash flows information:
Interest paid	$	10.6		$	18.1
Net tax (refunds) payments to state and national governments	(4.3		)	5.2

See Notes to Consolidated Financial Statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1. Nature of Operations and Summary of Significant Accounting Policies

Basis of presentation

These interim consolidated financial statements include the accounts of OneBeacon Insurance Group, Ltd. (the “Company” or the “Registrant”) and its subsidiaries (collectively, “OneBeacon”) and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The Company is an exempted Bermuda limited liability company. The OneBeacon operating companies are U.S.-based property and casualty insurance writers, most of which operate in a multi-company pool. OneBeacon offers a wide range of specialty insurance products and services through independent agencies, regional and national brokers, wholesalers and managing general agencies.

OneBeacon was acquired by White Mountains Insurance Group, Ltd. (“White Mountains”) from Aviva plc (“Aviva”) in 2001 (the “OneBeacon Acquisition”). White Mountains is a holding company whose businesses provide property and casualty insurance, reinsurance and certain other products. As of June 30, 2011, White Mountains owned 75.5% of the Company’s common shares. Within this report, the term “OneBeacon” is used to refer to one or more entities within the consolidated organization, as the context requires. The Company’s headquarters are located at 14 Wesley Street, 5th Floor, Hamilton HM 11, Bermuda. The Company’s U.S. corporate headquarters are located at 601 Carlson Parkway, Minnetonka, Minnesota 55305 and its registered office is located at Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

OneBeacon’s reportable segments are Specialty Insurance Operations, Other Insurance Operations and Investing, Financing and Corporate Operations. The Specialty Insurance Operations segment is comprised of twelve underwriting units that are aggregated into three major underwriting units for financial reporting: Managing General Agency (“MGA”) Business, Specialty Industries and Specialty Products. OneBeacon’s Other Insurance Operations segment includes AutoOne Insurance (“AutoOne”), a division that offers products and services to assigned risk markets. Other Insurance Operations also includes the results of the non-specialty commercial lines business and the traditional personal lines business, other run-off business and certain purchase accounting adjustments relating to the OneBeacon Acquisition. Investing, Financing and Corporate Operations includes the investing and financing activities for OneBeacon on a consolidated basis, and certain other activities conducted through the top holding company, OneBeacon Insurance Group, Ltd., and the intermediate subsidiaries which include OneBeacon U.S. Enterprises Holdings, Inc. and OneBeacon U.S. Holdings, Inc. (“OBH”), both U.S.-domiciled companies, as well as various intermediate holding companies domiciled in the United States, Gibraltar, Luxembourg and Bermuda.

Historically, OneBeacon has offered a range of specialty, commercial and personal products and services, however, in the wake of recent transactions OneBeacon is now focused exclusively on specialty business. On December 3, 2009, OneBeacon sold the renewal rights to its non-specialty commercial lines business and on July 1, 2010, OneBeacon completed the sale of its traditional personal lines business (Note 2). To better align OneBeacon’s operating and reporting structure with its business profile as a result of the transactions, OneBeacon revised its segment structure into Specialty Insurance Operations, Other Insurance Operations and Investing, Financing and Corporate Operations, as described above. As part of the resegmentation, agency results for business written on OneBeacon paper for which OneBeacon has an ownership interest have been reclassified within the underwriting results. The prior periods have been reclassified to conform to the current presentation. See Note 7.

All significant intercompany transactions have been eliminated in consolidation. These interim financial statements include all adjustments, consisting of a normal recurring nature, considered necessary by management to fairly state the financial position, results of operations and cash flows of OneBeacon. These interim financial statements may not be indicative of financial results for the full year and should be read in conjunction with the Company’s 2010 Annual Report on Form 10-K. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Refer to the Company’s 2010 Annual Report on Form 10-K for a complete discussion regarding OneBeacon’s significant accounting policies. Certain amounts in the prior period financial statements have been reclassified to conform to the current presentation.

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Recently Issued Accounting Pronouncements

Policy Acquisition Costs

On October 13, 2010, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2010-26, Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts, codified within Accounting Standards Codification (“ASC”) 944. The new standard changes the types of policy acquisition costs that are eligible for deferral. Specifically, the new guidance limits deferrable costs to those that are incremental direct costs of contract acquisition and certain costs related to acquisition activities performed by the insurer, such as underwriting, policy issuance and processing, medical and inspection costs and sales force contract selling. ASU 2010-26 defines incremental direct costs as those costs that result directly from and were essential to the contract acquisition and would not have been incurred absent the acquisition. Accordingly, under the new guidance, deferrable acquisition costs are limited to costs related to successful contract acquisitions. Acquisition costs that are not eligible for deferral are to be charged to expense in the period incurred.

ASU 2010-26 is effective for interim periods and annual fiscal years beginning after December 15, 2011 and may be applied prospectively or retrospectively. OneBeacon is currently evaluating the effect the adoption of ASU 2010-26 will have on its financial position and results of operations.

Fair Value Measurements and Disclosures

On May 12, 2011, the FASB issued ASU 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in US GAAP and IFRS. ASU 2011-04 clarifies existing guidance with respect to the concepts of highest and best use and valuation premise and measuring instruments classified within a reporting entity’s shareholders’ equity. ASU 2011-04 also clarifies disclosure requirements, requiring disclosure of quantitative information about unobservable inputs used in Level 3 fair value measurements. ASU 2011-04 also amends existing guidance. In circumstances where a reporting entity manages a portfolio of financial assets and liabilities based on the net market and counterparty credit risk exposures, ASU 2011-04 permits determination of the fair value of those instruments to be based on the net risk exposure. In addition, ASU 2011-04 permits the application of premiums or discounts to be applied in a fair value measurement to the extent that market participants would consider them in valuing the financial instruments. ASU 2011-04 also expands the required disclosures for Level 3 measurements, requiring that reporting entities provide a narrative description of the sensitivity of Level 3 fair value measurements to changes in unobservable inputs and the interrelationships between those inputs, if any. ASU 2011-04 is effective for interim and annual periods beginning after December 15, 2011. OneBeacon is currently evaluating the effect the adoption of ASU 2011-04 will have on its financial position and results of operations.

NOTE 2. Acquisitions and Dispositions

During the first six months of 2011, there were no acquisitions or dispositions. Except as described below with respect to the Personal Lines Transaction, during the first six months of 2010, there were no acquisitions or dispositions.

On July 1, 2010, OneBeacon completed the sale of its traditional personal lines business (the “Personal Lines Transaction”) to Tower Group, Inc. (“Tower”). The Personal Lines Transaction included two insurance companies, York Insurance Company of Maine (“York”) and Massachusetts Homeland Insurance Company (“MHIC”), through which the majority of the traditional personal lines business was written on a direct basis, two attorneys-in-fact managing the reciprocal insurance exchanges (“reciprocals”) that wrote the traditional personal lines business in New York and New Jersey, the surplus notes issued by the New York and New Jersey reciprocals and the remaining renewal rights to certain other traditional personal lines insurance policies. In addition, the Personal Lines Transaction included the execution of reinsurance agreements with certain subsidiaries of the Company pursuant to which OneBeacon cedes, on a 100% quota share basis, traditional personal lines business not directly written by York and MHIC and assumes, on a 100% quota share basis, non-traditional personal lines business written directly by York. During the second quarter of 2011, OneBeacon and Tower reached agreement on post-closing adjustments resulting in no material change to the $24.6 million after tax net gain on sale that OneBeacon had recorded during 2010. OneBeacon’s financial statements for the second quarter of 2010 included a $5.6 million tax benefit, a component of the net gain recorded upon completion of the sale, related to the difference between the tax basis of the companies sold as part of the Personal Lines Transaction and the net asset value of those entities under GAAP.

OneBeacon and Tower also entered into a Transition Services Agreement (“TSA”), pursuant to which OneBeacon is providing certain services to Tower during the three-year term of the TSA. Tower reimburses OneBeacon for all expenses incurred to provide these services. Reimbursement for these services is netted against the expense incurred. Regulatory approvals for the transaction were received during June 2010 and accordingly, the transaction met the criteria for held for sale accounting. As a result, the assets and liabilities associated with the business being sold were presented separately as single line items in the asset and liability

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sections of the consolidated balance sheet as of June 30, 2010. The Personal Lines Transaction did not meet the criteria for discontinued operations accounting because of significant continuing cash flows between OneBeacon and the business sold relating to TSA services and reinsurance activities.

NOTE 3. Reserves for Unpaid Loss and LAE

The following table summarizes the loss and LAE reserve activities of OneBeacon’s insurance subsidiaries for the three and six months ended June 30, 2011 and 2010:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Gross beginning balance	$	3,224.7		$	3,991.3		$	3,295.5		$	3,934.8
Less beginning reinsurance recoverable on unpaid losses	(1,864.0		)	(2,200.8		)	(1,893.2		)	(2,192.9		)
Net loss and LAE reserves	1,360.7			1,790.5			1,402.3			1,741.9
Loss and LAE incurred relating to:
Current year losses	161.9			280.2			311.6			619.9
Prior year losses	(10.1		)	(18.3		)	(15.2		)	(24.3		)
Total incurred loss and LAE	151.8			261.9			296.4			595.6
Loss and LAE paid relating to:
Current year losses	(61.2		)	(132.9		)	(89.3		)	(205.9		)
Prior year losses	(145.7		)	(180.0		)	(303.8		)	(392.1		)
Total loss and LAE payments	(206.9		)	(312.9		)	(393.1		)	(598.0		)
Net loss and LAE reserves	1,305.6			1,739.5			1,305.6			1,739.5
Net loss and LAE reserves reclassified to held for sale	—			(231.0		)	—			(231.0		)
Net ending balance	1,305.6			1,508.5			1,305.6			1,508.5
Plus ending reinsurance recoverable on unpaid losses	1,825.9			2,100.7			1,825.9			2,100.7
Gross ending balance	$	3,131.5		$	3,609.2		$	3,131.5		$	3,609.2

During the three months ended June 30, 2011, OneBeacon experienced $10.1 million of favorable loss and LAE reserve development on prior accident year loss reserves, with $7.1 million in Specialty Insurance Operations and $3.0 million in Other Insurance Operations. The favorable loss reserve development was primarily due to lower than expected severity on non-catastrophe losses related to professional liability lines, multiple peril liability lines and other general liability lines. During the three months ended June 30, 2010, OneBeacon experienced $18.3 million of favorable loss and LAE reserve development on prior accident year loss reserves, with $8.3 million in Specialty Insurance Operations and $10.0 million in Other Insurance Operations. The favorable loss reserve development was primarily due to lower than expected severity on non-catastrophe losses related to professional liability lines, multiple peril liability lines and other general liability lines. The favorable development also included a one-time $6.5 million release of commercial and personal auto reserves associated with participation in an involuntary auto pool.

During the six months ended June 30, 2011, OneBeacon experienced $15.2 million of favorable loss and LAE reserve development on prior accident year loss reserves, with $8.3 million in Specialty Insurance Operations and $6.9 million in Other Insurance Operations. The favorable loss reserve development was primarily due to lower than expected severity on non-catastrophe losses related to professional liability lines, multiple peril liability lines and other general liability lines. During the six months ended June 30, 2010, OneBeacon experienced $24.3 million of favorable loss and LAE reserve development on prior accident year loss reserves, with $11.0 million in Specialty Insurance Operations and $13.3 million Other Insurance Operations. The favorable loss reserve development was primarily due to lower than expected severity on non-catastrophe losses related to professional liability lines, multiple peril liability lines and other general liability lines. The favorable development also included a one-time $6.5 million release of commercial and personal auto reserves associated with participation in an involuntary auto pool.

In connection with purchase accounting for the OneBeacon Acquisition, OneBeacon was required to adjust to fair value the loss and LAE reserves and the related reinsurance recoverables on the balance sheet. The net reduction to loss and LAE reserves was accreted through an income statement charge ratably with and over the period the claims were settled. As of both June 30, 2011 and December 31, 2010, the outstanding pre-tax unaccreted adjustment was $0.

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NOTE 4. Reinsurance

In the normal course of business, OneBeacon’s insurance subsidiaries seek to limit losses that may arise from catastrophes or other events by reinsuring with third party reinsurers. OneBeacon remains liable for risks reinsured even if the reinsurer does not honor its obligations under reinsurance contracts.

Effective May 1, 2011, OneBeacon renewed its property catastrophe reinsurance program through April 30, 2012. The program provides coverage for OneBeacon’s property business as well as certain acts of terrorism. Under the program, the first $50.0 million of losses resulting from any single catastrophe are retained and the next $175.0 million of losses resulting from the catastrophe are reinsured in three layers, although OneBeacon retains a co-participation (26% of losses in excess of $50.0 million up to $100.0 million and 10% of losses in excess of $100.0 million up to $175.0 million). Any loss above $225.0 million would be retained in full. In the event of a catastrophe, OneBeacon’s property catastrophe reinsurance program is reinstated for the remainder of the original contract term by paying a reinstatement premium that is based on the percentage of coverage reinstated and the original property catastrophe coverage premium.

OneBeacon had entered into a 30% quota share agreement with a group of reinsurers that ran from January 1, 2009 through December 31, 2009, and had renewed the agreement effective January 1, 2010. During the three and six months ended June 30, 2010, OneBeacon ceded $14.0 million and $25.6 million, respectively, of written premiums from its Northeast homeowners business written through OneBeacon Insurance Company (“OBIC”) and its subsidiary companies, along with Adirondack Insurance Exchange (“Adirondack Insurance”) and New Jersey Skylands Insurance Agency (“NJSIA”) in New York and New Jersey, respectively. Effective July 1, 2010, the closing date of the Personal Lines Transaction, the agreement was amended to remove OneBeacon as a signatory.

At June 30, 2011, OneBeacon had $16.2 million of reinsurance recoverables on paid losses and $1,995.8 million (gross of $169.9 million in purchase accounting adjustments, as described in Note 3) that will become recoverable if claims are paid in accordance with current reserve estimates. Reinsurance contracts do not relieve OneBeacon of its obligations. Therefore, collectibility of balances due from its reinsurers is critical to OneBeacon’s financial strength. OneBeacon is selective in regard to its reinsurers, principally placing reinsurance with those reinsurers with strong financial condition, industry ratings and underwriting ability. Management monitors the financial condition and ratings of its reinsurers on an ongoing basis. As a result, uncollectible amounts have historically not been significant.

The following table provides a listing of OneBeacon’s top reinsurers for its insurance operations, excluding industry pools and associations and affiliates of OneBeacon, based upon recoverable amounts, the percentage of total reinsurance recoverables and the reinsurers’ A.M. Best Company, Inc. (“A.M. Best”) ratings.

($ in millions)	Balance at June 30, 2011		% of total		A.M. Best Rating(1)
National Indemnity Company and General Reinsurance Corporation(2)	$	1,491.4	74	%	A++
Hanover Insurance Company	113.6		6	%	A
Tokio Marine and Nichido Fire(3)	64.2		3	%	A++
Tower Insurance Company	62.3		3	%	A-
Munich Reinsurance America	32.5		2	%	A+

(1) A.M. Best ratings as detailed above are: “A++” (Superior, which is the highest of fifteen financial strength ratings), “A+” (Superior, which is the second highest of fifteen financial strength ratings), “A” (Excellent, which is the third highest of fifteen financial strength ratings) and “A-” (Excellent, which is the fourth highest of fifteen financial strength ratings).

(2) Includes $193.5 million of Third-Party Recoverables (as defined below), which NICO (as defined below) would pay under the terms of the NICO Cover (as defined below) if they are unable to collect from third-party reinsurers.

(3) Includes $37.1 million of reinsurance recoverables from various reinsurers that are guaranteed by Tokio Marine and Nichido Fire under the terms of a 100% quota share reinsurance agreement between Houston General Insurance Company and Tokio Marine and Nichido Fire.

In connection with the OneBeacon Acquisition, Aviva caused OneBeacon to purchase two reinsurance contracts: a reinsurance contract with National Indemnity Company (“NICO”) for up to $2.5 billion in old asbestos and environmental (“A&E”) claims and certain other exposures (the “NICO Cover”) and an adverse loss reserve development cover from General Reinsurance Corporation (“GRC”) for up to $570.0 million, comprised of $400.0 million of adverse loss reserve development occurring in years 2000 and prior (the “GRC Cover”) in addition to $170.0 million of reserves ceded as of the date of the OneBeacon Acquisition. The

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NICO Cover and GRC Cover, which were contingent on and occurred contemporaneously with the OneBeacon Acquisition, were put in place in lieu of a seller guarantee of loss and LAE reserves and are therefore accounted for under GAAP as a seller guarantee.

Under the terms of the NICO Cover, NICO receives the economic benefit of reinsurance recoverables from certain of OneBeacon’s third party reinsurers (“Third Party Reinsurers”) in existence at the time the NICO Cover was executed (“Third Party Recoverables”). As a result, the Third Party Recoverables serve to protect the $2.5 billion limit of NICO coverage for the benefit of OneBeacon. OneBeacon estimates that on an incurred basis it has used approximately $2.2 billion of the coverage provided by NICO at June 30, 2011. Since entering into the NICO Cover, approximately 8% of the $2.2 billion of utilized coverage relates to uncollectible Third Party Recoverables and settlements on Third Party Recoverables through June 30, 2011. Net losses paid totaled approximately $1.3 billion as of June 30, 2011. To the extent that actual experience differs from OneBeacon’s estimate of ultimate A&E losses and Third Party Recoverables, future losses could exceed the $320.2 million of protection remaining under the NICO Cover at June 30, 2011.

Pursuant to the GRC Cover, OneBeacon is not entitled to recover losses to the full contract limit if such losses are reimbursed by GRC more quickly than anticipated at the time the contract was signed. OneBeacon intends to seek reimbursement from GRC only for claims which result in payment patterns similar to those supporting its recoverables recorded pursuant to the GRC Cover. The economic cost of not submitting certain other eligible claims to GRC is primarily the investment spread between the rate credited by GRC and the rate achieved by OneBeacon on its own investments. This cost, if any, is expected to be nominal. During the three and six months ended June 30, 2011, $13.3 million and $47.1 million, respectively, was collected under the GRC Cover.

NOTE 5. Investment Securities

OneBeacon’s invested assets are comprised of securities and other investments held for general investment purposes. Refer to the Company’s 2010 Annual Report on Form 10-K for a complete discussion.

In accordance with ASC 825, OneBeacon classifies its portfolio of fixed maturity investments and common equity securities, including convertible bonds, held for general investment purposes as trading securities. Trading securities are reported at fair value as of the balance sheet date as determined by quoted market prices when available. Realized and unrealized investment gains and losses on trading securities are reported in net realized and unrealized investment gains and losses in revenues on a pre-tax basis.

Short-term investments consist of money market funds, certificates of deposit and other securities which, at the time of purchase, mature or become available for use within one year. Short-term investments are carried at amortized cost, which approximated fair value as of June 30, 2011 and December 31, 2010.

Other investments primarily include hedge funds and private equity funds. OneBeacon measures its investments in hedge funds and private equity funds at fair value with changes therein reported in net realized and unrealized investment gains and losses in revenues on a pre-tax basis. Other investments also includes an investment in a community reinvestment vehicle which is accounted for at fair value and a tax advantaged federal affordable housing development fund which OneBeacon accounts for under the equity method.

OneBeacon’s net investment income is comprised primarily of interest income associated with OneBeacon’s fixed maturity investments, dividend income from its equity investments and interest income from its short-term investments. Net investment income for the three and six months ended June 30, 2011 and 2010 consisted of the following:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Investment income:
Fixed maturity investments	$	19.0		$	24.3		$	39.4		$	52.0
Short-term investments	0.1			0.4			0.1			0.5
Common equity securities	1.0			1.1			2.4			1.9
Convertible bonds	0.8			1.4			1.8			3.0
Other investments	(0.4		)	0.2			(0.4		)	0.6
Gross investment income	20.5			27.4			43.3			58.0
Less investment expenses	(1.8		)	(2.4		)	(3.6		)	(4.7		)
Net investment income, pre-tax	$	18.7		$	25.0		$	39.7		$	53.3

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The composition of net realized investment gains (losses), a component of net realized and unrealized investment gains (losses), consisted of the following:

	Three months ended June 30,					Six months ended June 30,
	2011		2010			2011		2010
	($ in millions)
Fixed maturity investments	$	11.4	$	5.6		$	18.6	$	30.0
Short-term investments	—		—			—		—
Common equity securities	1.5		1.3			4.2		1.6
Convertible bonds	1.2		6.4			4.5		10.5
Other investments(1)	2.8		(0.5		)	7.6		(2.9		)
Net realized investment gains (losses), pre-tax	$	16.9	$	12.8		$	34.9	$	39.2

(1) The three and six months ended June 30, 2010 includes $1.3 million of realized losses related to the impairment of a receivable related to an outstanding hedge fund redemption.

The net changes in fair value for the three and six months ended June 30, 2011 are as follows:

	Three months ended June 30, 2011									Six months ended June 30, 2011
	Changes in net unrealized gains and losses(1)			Changes in net foreign currency translation gains and losses(1)			Total net changes in fair value reflected in revenues(1)			Changes in net unrealized gains and losses(1)			Changes in net foreign currency translation gains and losses(1)			Total net changes in fair value reflected in revenues(1)
	($ in millions)
Fixed maturity investments	$	2.5		$	—		$	2.5		$	(0.4	)	$	0.1		$	(0.3	)
Short-term investments	—			0.1			0.1			—			0.1			0.1
Common equity securities	(5.6		)	(0.1		)	(5.7		)	2.9			(0.1		)	2.8
Convertible bonds	(4.1		)	—			(4.1		)	(6.3		)	—			(6.3		)
Other investments	1.3			—			1.3			2.9			—			2.9
Total	$	(5.9	)	$	—		$	(5.9	)	$	(0.9	)	$	0.1		$	(0.8	)

(1)	Includes changes in net deferred gains and losses on sales of investments between OneBeacon and entities under White Mountains’ common control of $(1.0) million and $(1.4) million, pre-tax, for the three and six months ended June 30, 2011, respectively.

The net changes in fair value for the three and six months ended June 30, 2010 are as follows:

	Three months ended June 30, 2010									Six months ended June 30, 2010
	Changes in net unrealized gains and losses(1)			Changes in net foreign currency translation gains and losses(1)			Total net changes in fair value reflected in revenues(1)			Changes in net unrealized gains and losses(1)			Changes in net foreign currency translation gains and losses(1)			Total net changes in fair value reflected in revenues(1)
	($ in millions)
Fixed maturity investments	$	0.9		$	(2.7	)	$	(1.8	)	$	(0.9	)	$	(0.1	)	$	(1.0	)
Short-term investments	—			(0.6		)	(0.6		)	—			(0.9		)	(0.9		)
Common equity securities	(11.8		)	—			(11.8		)	(4.6		)	—			(4.6		)
Convertible bonds	(10.5		)	—			(10.5		)	(8.4		)	—			(8.4		)
Other investments	(2.5		)	—			(2.5		)	3.7			—			3.7
Total	$	(23.9	)	$	(3.3	)	$	(27.2	)	$	(10.2	)	$	(1.0	)	$	(11.2	)

(1)	Includes changes in net deferred gains and losses on sales of investments between OneBeacon and entities under White Mountains’ common control of $(0.4) million and $(1.3) million, pre-tax, for the three and six months ended June 30, 2010, respectively.

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The components of OneBeacon’s ending net unrealized investment gains and losses, excluding the impact of net unrealized foreign currency translation gains and losses, on its investment portfolio as of June 30, 2011 and December 31, 2010 were as follows:

	June 30,			December 31,
	2011			2010
	($ in millions)
Investment securities:
Gross unrealized investment gains	$	153.5		$	162.8
Gross unrealized investment losses	(10.2		)	(20.0		)
Net unrealized gains from investment securities	143.3			142.8
Income taxes	(50.2		)	(50.0		)
Total net unrealized investment gains, after tax	$	93.1		$	92.8

The cost or amortized cost, gross unrealized investment gains and losses, net foreign currency gains and carrying values of OneBeacon’s fixed maturity investments as of June 30, 2011 and December 31, 2010 were as follows:

	June 30, 2011
	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net foreign currency gains		Carrying value
	($ in millions)
U.S. Government and agency obligations	$	219.9	$	2.2	$	—		$	—	$	222.1
Debt securities issued by corporations	784.6		40.1		(2.0		)	—		822.7
Municipal obligations	2.0		—		—			—		2.0
Asset-backed securities	1,080.8		11.1		(1.6		)	—		1,090.3
Foreign government obligations	7.7		0.6		—			0.1		8.4
Preferred stocks	76.9		6.1		—			—		83.0
Total fixed maturity investments	$	2,171.9	$	60.1	$	(3.6	)	$	0.1	$	2,228.5

	December 31, 2010
	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net foreign currency gains		Carrying value
	($ in millions)
U.S. Government and agency obligations	$	241.7	$	9.0	$	—		$	—	$	250.7
Debt securities issued by corporations	908.5		46.5		(6.4		)	—		948.6
Municipal obligations	2.1		—		—			—		2.1
Asset-backed securities	1,117.2		9.1		(8.9		)	—		1,117.4
Foreign government obligations	12.7		0.6		—			—		13.3
Preferred stocks	77.5		5.9		—			—		83.4
Total fixed maturity investments	$	2,359.7	$	71.1	$	(15.3	)	$	—	$	2,415.5

The cost or amortized cost, gross unrealized investment gains and losses, net foreign currency gains and carrying values of OneBeacon’s common equity securities, convertible bonds and other investments as of June 30, 2011 and December 31, 2010 were as follows:

	June 30, 2011
	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net foreign currency gains		Carrying value
	($ in millions)
Common equity securities	$	253.8	$	53.3	$	(2.4	)	$	—	$	304.7
Convertible bonds	74.2		6.7		(1.1		)	—		79.8
Other investments	128.0		33.4		(3.1		)	—		158.3

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	December 31, 2010
	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net foreign currency gains		Carrying value
	($ in millions)
Common equity securities	$	237.2	$	48.4	$	(0.4	)	$	0.1	$	285.3
Convertible bonds	82.2		11.6		—			—		93.8
Other investments	144.0		31.7		(4.3		)	—		171.4

As of June 30, 2011 and December 31, 2010, investments of $29.1 million and $33.5 million, respectively, were held in trusts required to be maintained in relation to various reinsurance agreements. The trust balance as of June 30, 2011 and December 31, 2010 includes $24.8 million and $29.0 million, respectively, related to investments held in a trust established in connection with the Personal Lines Transaction.

Fair value measurements

OneBeacon records its investments in accordance with ASC 820 which provides a revised definition of fair value, establishes a framework for measuring fair value and expands financial statement disclosure requirements for fair value information. Under ASC 820, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants (an “exit price”). ASC 820 establishes a fair value hierarchy that distinguishes between inputs based on market data from independent sources (“observable inputs”) and a reporting entity’s internal assumptions based upon the best information available when external market data is limited or unavailable (“unobservable inputs”). The fair value hierarchy prioritizes fair value measurements into three levels based on the nature of the inputs. Quoted prices in active markets for identical assets or liabilities have the highest priority (“Level 1”), followed by observable inputs other than quoted prices, including quoted prices for similar but not identical assets or liabilities (“Level 2”) and unobservable inputs, including the reporting entity’s estimates of the assumptions that market participants would use, having the lowest priority (“Level 3”).

As of both June 30, 2011 and December 31, 2010, approximately 91% of the investment portfolio recorded at fair value was priced based upon observable inputs.

OneBeacon uses brokers and outside pricing services to assist in determining fair values. For investments in active markets, OneBeacon uses the quoted market prices provided by the outside pricing services to determine fair value. The outside pricing services OneBeacon uses have indicated that they will only provide prices where observable inputs are available. In circumstances where quoted market prices are unavailable, OneBeacon utilizes fair value estimates based upon reference to other observable inputs other than quoted prices, including matrix pricing, benchmark interest rates, market comparables, broker quotes and other relevant observable inputs. In circumstances where observable inputs are adjusted to reflect management’s best estimate of fair value, such fair value measurements are considered a lower level measurement in the fair value hierarchy.

Other investments, which are primarily comprised of hedge funds and private equity funds for which the fair value option has been elected, are carried at fair value based upon OneBeacon’s proportionate interest in the underlying fund’s net asset value, which is deemed to approximate fair value. The fair value of OneBeacon’s investments in hedge funds and private equity funds has been estimated using net asset value because it reflects the fair value of the funds’ underlying investments in accordance with ASC 820. OneBeacon employs a number of procedures to assess the reasonableness of the fair value measurements, including obtaining and reviewing each fund’s audited financial statements and discussing each fund’s pricing with the fund’s manager. However, since the fund managers do not provide sufficient information to independently evaluate the pricing inputs and methods for each underlying investment, the inputs are considered to be unobservable. Accordingly, the fair values of OneBeacon’s investment in hedge funds and private equity funds have been classified as Level 3 under the fair value hierarchy.

In circumstances where the underlying investments are publicly traded, such as the investments made by hedge funds, the fair value of the underlying investments is determined using current market prices. In circumstances where the underlying investments are not publicly traded, such as the investments made by private equity funds, the private equity fund managers have considered the need for a liquidity discount on each of the underlying investments when determining the fund’s net asset value in accordance with ASC 820. In circumstances where OneBeacon’s portion of a fund’s net asset value is deemed to differ from fair value due to illiquidity or other factors associated with OneBeacon’s investment in the fund, including counterparty credit risk, the net asset value is adjusted accordingly. At June 30, 2011 and December 31, 2010, OneBeacon did not record a liquidity adjustment to the net asset value related to its investments in hedge funds or private equity funds.

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2010 were comprised of $53.6 million and $63.4 million, respectively, in hedge funds, $68.9 million and $72.7 million, respectively, in private equity funds, $14.1 million for both periods of an investment in a community reinvestment vehicle. At June 30, 2011 and December 31, 2010, OneBeacon held investments in 9 and 10 hedge funds, respectively, and 14 and 15 private equity funds, respectively. The largest investment in a single fund was $17.2 million and $24.6 million, respectively, at June 30, 2011 and December 31, 2010.

As of June 30, 2011 and December 31, 2010, other investments also included $21.7 million and $21.2 million, respectively, of an investment in a tax advantaged federal affordable housing development fund which is accounted for using the equity method.

The fair value measurements at June 30, 2011 and December 31, 2010 and their related inputs are as follows:

	Fair value at June 30, 2011		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs
	($ in millions)
Fixed maturity investments:
U.S. Government and agency obligations	$	222.1	$	222.1	$	—	$	—
Debt securities issued by corporations:
Consumer	303.2		—		303.2		—
Industrial	182.9		—		182.9		—
Financial	78.0		—		78.0		—
Communications	73.6		—		73.6		—
Energy	44.8		—		44.8		—
Basic materials	62.0		—		62.0		—
Utilities	63.3		—		63.3		—
Technology	14.9		—		14.9		—
Debt securities issued by corporations	822.7		—		822.7		—
Municipal obligations	2.0		—		2.0		—
Asset-backed securities	1,090.3		—		1,068.3		22.0
Foreign government obligations	8.4		7.6		0.8		—
Preferred stocks	83.0		—		12.7		70.3
Fixed maturity investments	2,228.5		229.7		1,906.5		92.3
Short-term investments	116.2		116.2		—		—
Common equity securities:
Financials	127.5		88.5		—		39.0
Basic Materials	52.7		52.7		—		—
Consumer	37.8		37.3		0.1		0.4
Energy	36.4		36.4		—		—
Utilities	24.3		21.2		—		3.1
Other	26.0		26.0		—		—
Common equity securities	304.7		262.1		0.1		42.5
Convertible bonds	79.8		—		79.8		—
Other investments(1)	136.6		—		—		136.6
Total(1)	$	2,865.8	$	608.0	$	1,986.4	$	271.4

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	Fair value at December 31, 2010		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs
	($ in millions)
Fixed maturity investments:
U.S. Government and agency obligations	$	250.7	$	250.7	$	—	$	—
Debt securities issued by corporations:
Consumer	330.4		—		330.4		—
Industrial	227.9		—		227.9		—
Financial	90.5		—		90.5		—
Communications	84.7		—		84.7		—
Energy	60.7		—		60.7		—
Basic materials	78.9		—		78.9		—
Utilities	61.0		—		61.0		—
Technology	14.5		—		14.5		—
Debt securities issued by corporations	948.6		—		948.6		—
Municipal obligations	2.1		—		2.1		—
Asset-backed securities	1,117.4		—		1,089.7		27.7
Foreign government obligations	13.3		12.6		0.7		—
Preferred stocks	83.4		—		12.0		71.4
Fixed maturity investments	2,415.5		263.3		2,053.1		99.1
Short-term investments	300.0		300.0		—		—
Common equity securities:
Financials	104.1		66.7		—		37.4
Basic Materials	57.0		57.0		—		—
Consumer	50.0		49.9		0.1		—
Energy	36.0		33.7		—		2.3
Utilities	22.4		22.4		—		—
Other	15.8		15.7		0.1		—
Common equity securities	285.3		245.4		0.2		39.7
Convertible bonds	93.8		—		93.8		—
Other investments(1)	150.2		—		—		150.2
Total(1)	$	3,244.8	$	808.7	$	2,147.1	$	289.0

(1) Excludes the carrying value of $21.7 million and $21.2 million, respectively, associated with a tax advantaged federal affordable housing development fund accounted for using the equity method as of June 30, 2011 and December 31, 2010.

At June 30, 2011 and December 31, 2010, OneBeacon held one private preferred stock that represented approximately 85% and 86%, respectively, of its preferred stock portfolio. OneBeacon used quoted market prices for similar securities that were adjusted to reflect management’s best estimate of fair value; this security is classified as a Level 3 measurement.

In addition to the investment portfolio described above, OneBeacon had $44.6 million and $41.3 million, respectively, of liabilities recorded at fair value and included in other liabilities as of June 30, 2011 and December 31, 2010. These liabilities relate to securities that have been sold short by a limited partnership that OneBeacon invests in and is required to consolidate in accordance with GAAP. As of June 30, 2011, $44.5 million of these liabilities have been classified as Level 1 measurements and $0.1 million of these liabilities have been classified as Level 2 measurements. As of December 31, 2010, all of the liabilities included in the $41.3 million have been classified as Level 1 measurements.

The following table summarizes the ratings of OneBeacon’s corporate debt securities as of June 30, 2011 and December 31, 2010:

	June 30, 2011		December 31, 2010
	($ in millions)
AA	$	52.4	$	88.6
A	332.0		387.7
BBB	432.9		463.1
BB	0.7		8.8
Other	4.7		0.4
Debt securities issued by corporations	$	822.7	$	948.6

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Rollforwards of Fair Value Measurements by Level

The changes in Level 1 fair value measurements for the three and six months ended June 30, 2011 are as follows:

	Fixed maturity investments			Common equity securities			Convertible bonds		Other investments		Total (1)
	($ in millions)
Balance at January 1, 2011	$	263.3		$	245.4		$	—	$	—	$	508.7
Amortization/accretion	0.8			—			—		—		0.8
Total net realized and unrealized gains (losses)	1.9			12.5			—		—		14.4
Purchases	130.7			35.2			—		—		165.9
Sales	(133.9		)	(25.6		)	—		—		(159.5		)
Transfers in	—			—			—		—		—
Transfers out	—			—			—		—		—
Balance at March 31, 2011	$	262.8		$	267.5		$	—	$	—	$	530.3
Amortization/accretion	0.6			—			—		—		0.6
Total net realized and unrealized gains (losses)	0.5			(4.7		)	—		—		(4.2		)
Purchases	39.5			12.7			—		—		52.2
Sales	(73.7		)	(13.4		)	—		—		(87.1		)
Transfers in	—			—			—		—		—
Transfers out	—			—			—		—		—
Balance at June 30, 2011	$	229.7		$	262.1		$	—	$	—	$	491.8

(1) Excludes short-term investments which are deemed to have a Level 1 designation.

The changes in Level 2 fair value measurements for the three and six months ended June 30, 2011 are as follows:

	Fixed maturity investments			Common equity securities			Convertible bonds			Other investments		Total
	($ in millions)
Balance at January 1, 2011	$	2,053.1		$	0.2		$	93.8		$	—	$	2,147.1
Amortization/accretion	(5.1		)	—			0.3			—		(4.8		)
Total net realized and unrealized gains (losses)	0.7			—			1.1			—		1.8
Purchases	576.2			—			17.4			—		593.6
Sales	(565.5		)	—			(21.7		)	—		(587.2		)
Transfers in	27.7			—			1.4			—		29.1
Transfers out	(1.4		)	—			—			—		(1.4		)
Balance at March 31, 2011	$	2,085.7		$	0.2		$	92.3		$	—	$	2,178.2
Amortization/accretion	(4.0		)	—			0.3			—		(3.7		)
Total net realized and unrealized gains (losses)	16.9			(0.1		)	(2.9		)	—		13.9
Purchases	356.1						6.3			—		362.4
Sales	(548.2		)	—			(16.2		)	—		(564.4		)
Transfers in	—			—			—			—		—
Transfers out	—			—			—			—		—
Balance at June 30, 2011	$	1,906.5		$	0.1		$	79.8		$	—	$	1,986.4

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The changes in Level 3 fair value measurements for the three and six months ended June 30, 2011 are as follows:

	Fixed maturity investments			Common equity securities			Convertible bonds		Other investments(1)			Total(1)
	($ in millions)
Balance at January 1, 2011	$	99.1		$	39.7		$	—	$	150.2		$	289.0
Amortization/accretion	—			—			—		—			—
Total net realized and unrealized gains (losses)	1.8			(1.3		)	—		6.4			6.9
Purchases	0.3			3.9			—		1.8			6.0
Sales	—			(0.1		)	—		(17.0		)	(17.1		)
Transfers in	—			—			—		—			—
Transfers out	(27.7		)	—			—		—			(27.7		)
Balance at March 31, 2011	$	73.5		$	42.2		$	—	$	141.4		$	257.1
Amortization/accretion	—			—			—		—			—
Total net realized and unrealized gains (losses)	(3.4		)	0.3			—		4.2			1.1
Purchases	22.2			—			—		0.8			23.0
Sales	—			—			—		(9.8		)	(9.8		)
Transfers in	—			—			—		—			—
Transfers out	—			—			—		—			—
Balance at June 30, 2011	$	92.3		$	42.5		$	—	$	136.6		$	271.4

(1) Excludes the carrying value of $21.7 million associated with a tax advantaged federal affordable housing development fund accounted for using the equity method.

“Transfers out” of Level 3 fixed maturity investments of $27.7 million for the three months ended March 31, 2011 were comprised of securities which had been previously classified as a Level 3 measurement and were recategorized as a Level 2 measurement when quoted market prices for similar securities that were considered reliable and could be validated against an alternative source became available.

The following table summarizes the change in net unrealized gains or losses for assets designated as Level 3 for the three and six months ended June 30, 2011 and 2010:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Fixed maturity investments	$	(3.1	)	$	(3.5	)	$	(1.3	)	$	(2.8	)
Short-term investments	—			—			—			—
Common equity securities	3.2			1.5			1.9			3.9
Convertible bonds	—			—			—			—
Other investments	1.3			(2.5		)	2.9			3.7
Total	$	1.4		$	(4.5	)	$	3.5		$	4.8

Asset-backed Securities

OneBeacon purchases commercial and residential mortgage-backed securities with the goal of maximizing its risk adjusted returns in the context of a diversified portfolio. OneBeacon’s non-agency commercial mortgage-backed portfolio (“CMBS”) is generally short tenor and structurally senior, with more than 20 points of subordination on average for fixed rate CMBS and more than 70 points of subordination on average for floating rate CMBS as of June 30, 2011. In general, subordination represents the percentage of principal loss on the underlying collateral that would have to occur before the security incurs a loss. These collateral losses, instead, are first absorbed by other securities lower in the capital structure. OneBeacon believes this structural protection mitigates the risk of loss tied to refinancing challenges facing the commercial real estate market. As of June 30, 2011, on average approximately 1% of the underlying loans were reported as non-performing for all CMBS held by OneBeacon. OneBeacon is not an originator of residential mortgage loans and did not hold any residential mortgage-backed securities (“RMBS”) categorized as sub-prime as of June 30, 2011. OneBeacon’s investments in hedge funds and private equity funds contain negligible amounts of sub-prime mortgage-backed securities as of June 30, 2011. OneBeacon considers sub-prime mortgage-backed securities to be those that have underlying loan pools that exhibit weak credit characteristics or are issued from dedicated sub-prime shelves or dedicated

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second-lien shelf registrations (i.e., OneBeacon considers investments backed primarily by second-liens to be a sub-prime risk regardless of credit scores or other metrics).

There are also mortgage-backed securities that OneBeacon categorizes as “non-prime” (also called “Alt A” or “A-”) that are backed by collateral that has overall credit quality between prime and sub-prime, as determined based on OneBeacon’s review of the characteristics of their underlying mortgage loan pools, such as credit scores and financial ratios. As of June 30, 2011, OneBeacon did not hold any mortgage-backed securities that were classified as non-prime. OneBeacon’s non-agency residential mortgage-backed portfolio is generally of moderate average life, fixed rate and structurally senior. OneBeacon does not own any collateralized debt obligations, including residential mortgage-backed collateralized debt obligations.

The following table summarizes the carrying value of OneBeacon’s asset-backed securities as of June 30, 2011 and December 31, 2010:

	June 30, 2011						December 31, 2010
	Fair Value		Level 2		Level 3		Fair Value		Level 2		Level 3
	($ in millions)
Mortgage-backed securities:
Agency:
GNMA	$	691.3	$	669.3	$	22.0	$	684.7	$	663.4	$	21.3
FNMA	139.2		139.2		—		143.0		143.0		—
FHLMC	17.9		17.9		—		19.0		19.0		—
Total agency(1)	848.4		826.4		22.0		846.7		825.4		21.3
Non-agency:
Residential	8.2		8.2		—		6.4		—		6.4
Commercial	36.6		36.6		—		36.3		36.3		—
Total Non-agency	44.8		44.8		—		42.7		36.3		6.4
Total mortgage-backed securities	893.2		871.2		22.0		889.4		861.7		27.7
Other asset-backed securities:
Credit card receivables	73.6		73.6		—		97.5		97.5		—
Vehicle receivables	123.5		123.5		—		130.5		130.5		—
Total other asset-backed securities	197.1		197.1		—		228.0		228.0		—
Total asset-backed securities	$	1,090.3	$	1,068.3	$	22.0	$	1,117.4	$	1,089.7	$	27.7

(1) Represents publicly traded mortgage-backed securities which carry the full faith and credit guaranty of the U.S. government (i.e., GNMA) or are guaranteed by a government sponsored entity (i.e., FNMA, FHLMC).

Non-agency Mortgage-backed Securities

The security issuance years of OneBeacon’s investments in non-agency RMBS and non-agency CMBS securities as of June 30, 2011 are as follows:

	Security Issuance Year
	Fair Value		2003		2005		2007		2010		2011
	($ in millions)
Non-agency RMBS	$	8.2	$	—	$	—	$	—	$	8.2	$	—
Non-agency CMBS	36.6		1.1		13.0		3.2		—		19.3
Total	$	44.8	$	1.1	$	13.0	$	3.2	$	8.2	$	19.3

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Non-agency Residential Mortgage-backed Securities

The classification of the underlying collateral quality and the tranche levels of OneBeacon’s non-agency RMBS securities are as follows as of June 30, 2011:

	Fair Value		Super Senior(1)		Senior(2)		Subordinate(3)
	($ in millions)
Prime	$	8.2	$	—	$	8.2	$	—
Sub-prime	—		—		—		—
Total	$	8.2	$	—	$	8.2	$	—

(1) At issuance, Super Senior were rated AAA by Standard & Poor’s Rating Service (“Standard & Poor’s”) or Aaa by Moody’s Investors Service, Inc. (“Moody’s”) and were senior to other AAA or Aaa bonds.

(2) At issuance, Senior were rated AAA by Standard & Poor’s and were senior to non-AAA bonds.

(3) At issuance, Subordinate were not rated AAA by Standard & Poor’s and were junior to other bonds.

Non-agency Commercial Mortgage-backed Securities

The amount of fixed and floating rate securities and their tranche levels are as follows as of June 30, 2011:

	Fair Value		Super Senior(1)		Senior(2)		Subordinate(3)
	($ in millions)
Fixed rate CMBS	$	22.5	$	2.1	$	20.4	$	—
Floating rate CMBS	14.1		14.1		—		—
Total	$	36.6	$	16.2	$	20.4	$	—

(1) At issuance, Super Senior were rated AAA by Standard & Poor’s and were senior to other AAA bonds.

(2) At issuance, Senior were rated AAA by Standard & Poor’s or Aaa by Moody’s and were senior to non-AAA or non-Aaa bonds.

(3) At issuance, Subordinate were not rated AAA by Standard & Poor’s and were senior to other bonds.

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Other Investments

OneBeacon holds investments in hedge funds and private equity funds which are included in other investments. The fair value of these investments has been estimated using the net asset value of the funds. The decrease in the fair value of hedge funds and private equity funds is due to net redemptions during the period. The following tables summarize investments in hedge funds and private equity funds at June 30, 2011 and December 31, 2010:

	June 30, 2011				December 31, 2010
	Fair Value		Unfunded Commitments		Fair Value		Unfunded Commitments
	($ in millions)
Hedge funds
Long/short credit and distressed	$	15.4	$	—	$	15.1	$	—
Long bank loan	0.4		—		2.0		—
Long/short equity	35.4		—		39.8		—
Long/short equity activist	2.4		—		6.5		—
Total hedge funds	$	53.6	$	—	$	63.4	$	—
Private equity funds
Insurance	$	3.4	$	0.1	$	3.5	$	0.1
Distressed residential real estate	17.1		—		24.6		—
Energy infrastructure and services	15.7		4.6		13.6		5.2
Healthcare	1.2		3.5		0.8		4.0
Multi-sector	19.4		5.7		19.1		6.3
Private equity secondaries	7.5		2.7		6.9		2.9
Real estate	4.6		0.5		4.2		0.7
Total private equity funds	$	68.9	$	17.1	$	72.7	$	19.2
Total hedge funds and private equity funds(1)	$	122.5	$	17.1	$	136.1	$	19.2

(1) Other investments also includes $14.1 million of an investment in a community reinvestment vehicle as of June 30, 2011 and December 31, 2010 and $21.7 million and $21.2 million, respectively, of an investment in a tax advantaged federal affordable housing development fund as of June 30, 2011 and December 31, 2010.

Redemptions of investments in certain funds are subject to restrictions including lock-up periods where no redemptions or withdrawals are allowed, restrictions on redemption frequency and advance notice periods for redemptions. Amounts requested for redemptions remain subject to market fluctuations until the redemption effective date, which generally falls at the end of the defined redemption period. The following summarizes the June 30, 2011 fair value of hedge funds subject to restrictions on redemption frequency and advance notice period requirements for investments in active hedge funds:

	Hedge Funds—Active Funds
	30 - 59 days notice		60 - 89 days notice		90 - 119 days notice		120+ days notice		Total
	($ in millions)
Redemption frequency
Monthly	$	—	$	—	$	—	$	5.7	$	5.7
Quarterly	25.3		8.2		11.6		—		45.1
Annual	—		—		2.4		0.4		2.8
Total	$	25.3	$	8.2	$	14.0	$	6.1	$	53.6

Certain of the hedge fund investments are no longer active and are in the process of disposing of their underlying investments. Distributions from such funds are remitted to investors as the fund’s underlying investments are liquidated. At June 30, 2011, $1.7 million of hedge funds were in liquidation. The actual amount of the final distribution is subject to market fluctuations. The date at which such distributions will be received is not determinable at June 30, 2011.

OneBeacon has also submitted redemption requests for certain of its investments in active hedge funds. At June 30, 2011, redemptions of $2.2 million were outstanding. The date at which such redemptions will be received is not determinable at June 30, 2011. Redemptions are recorded as receivables when approved by the hedge funds and when no longer subject to market fluctuations.

Investments in private equity funds are generally subject to “lock-up” periods during which investors may not request a redemption. Distributions prior to the expected termination date of the fund may be limited to dividends or proceeds arising from the liquidation of the fund’s underlying investment. In addition, certain private equity funds provide an option to extend the lock-up

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period at either the sole discretion of the fund manager or upon agreement between the fund and the investors. At June 30, 2011, investments in private equity funds were subject to lock-up periods as follows:

	1 - 3 years		3 - 5 years		5 - 10 years		>10 years		Total
	($ in millions)
Private Equity Funds—expected lock-up period remaining	$	20.5	$	—	$	48.4	$	—	$	68.9

NOTE 6. Debt

OneBeacon’s debt outstanding as of June 30, 2011 and December 31, 2010 consisted of the following:

	June 30, 2011			December 31, 2010
	($ in millions)
Senior unsecured notes, at face value	$	269.9		$	419.9
Unamortized original issue discount	(0.2		)	(0.3		)
Senior unsecured notes, carrying value	$	269.7		$	419.6

Senior Notes

In May 2003, OBH issued $700.0 million face value of senior unsecured debt through a public offering, at an issue price of 99.7% (the “Senior Notes”) and received $693.4 million of proceeds. The Senior Notes bear an annual interest rate of 5.875%, payable semi-annually in arrears on May 15 and November 15, until maturity on May 15, 2013, and are fully and unconditionally guaranteed as to the payment of principal and interest by White Mountains pursuant to a separation agreement. Refer to “Note 16. Related Party Disclosures” of the Company’s 2010 Annual Report on Form 10-K. OBH incurred $7.3 million in expenses related to the issuance of the Senior Notes (including the $4.5 million underwriting discount), which have been deferred and are being recognized into interest expense over the life of the Senior Notes. Taking into effect the amortization of the original issue discount and all underwriting and issuance expenses, the Senior Notes have an effective yield to maturity of approximately 6.0% per annum. At June 30, 2011, OBH was in compliance with all of the covenants under the Senior Notes.

On March 24, 2011, OBH commenced a cash tender offer for up to $150.0 million in aggregate principal amount of the Senior Notes at a price of $1,045 per $1,000 principal amount. The cash tender offer, which was not subject to the tender of any minimum principal amount of Senior Notes, expired on April 20, 2011. Holders of Senior Notes who tendered on or before April 6, 2011 received an early tender payment of $30 for every $1,000 principal amount of Senior Notes validly tendered. Payment for the Senior Notes included accrued and unpaid interest up to the settlement date. OBH accepted and retired $150.0 million aggregate principal amount of the Senior Notes for $161.6 million, which resulted in a $12.0 million pre-tax loss, including transaction fees.

On May 3, 2010, OBH commenced a cash tender offer for up to $200.0 million in aggregate principal amount of the Senior Notes at a price of $1,027.50 per $1,000 principal amount. The cash tender offer, which was not subject to the tender of any minimum principal amount of Senior Notes, expired on May 28, 2010. Holders of Senior Notes who tendered on or before May 14, 2010 received an early tender payment of $30 for every $1,000 principal amount of Senior Notes validly tendered. Payment for the Senior Notes included accrued and unpaid interest up to the settlement date. OBH accepted and retired $156.4 million aggregate principal amount of the Senior Notes, of which $155.2 million was tendered by the early tender deadline, for purchase for $165.4 million, which resulted in a $9.6 million pre-tax loss, including transaction fees.

During the second quarter of 2010, OBH repurchased and retired $18.2 million of outstanding Senior Notes for $18.9 million, which resulted in a $0.7 million loss. During the first quarter of 2010, OBH repurchased and retired $11.5 million of outstanding Senior Notes for $11.9 million, which resulted in a $0.5 million loss. During the first quarter of 2010, OBIC purchased $1.1 million of outstanding Senior Notes for $1.1 million.

Other Debt of Operating Subsidiaries

In connection with the acquisition of Atlantic Specialty Insurance Company on March 31, 2004, OneBeacon issued a $20.0 million ten-year note to the seller (the “Atlantic Specialty Note”). OneBeacon was required to repay $2.0 million of principal on the Atlantic Specialty Note each year, commencing in January 2007. During the three months ended March 31, 2010, OneBeacon repaid $14.0 million on the Atlantic Specialty Note, representing the outstanding principal on the note.

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NOTE 7. Segment Information

To better align its operating and reporting structure with OneBeacon’s go-forward business profile that resulted from the sale of the non-specialty commercial lines business to The Hanover Insurance Group (“The Hanover”) (the “Commercial Lines Transaction”) and the Personal Lines Transaction, which have transformed OneBeacon into a specialty lines company, management re-evaluated its segments during the fourth quarter of 2010 to determine the most effective management reporting structure. As a result, OneBeacon’s reportable segments are: (1) Specialty Insurance Operations, (2) Other Insurance Operations and (3) Investing, Financing and Corporate Operations. OneBeacon made its segment determination based on consideration of the following criteria: (i) the nature of the business activities of each of the Company’s subsidiaries and affiliates; (ii) the manner in which the Company’s subsidiaries and affiliates are organized; (iii) the existence of primary managers responsible for specific subsidiaries and affiliates; and (iv) the organization of information provided to the chief operating decision makers and the Board of Directors (the “Board”).

The Specialty Insurance Operations segment is comprised of twelve underwriting units that are aggregated into three major underwriting units for financial reporting: MGA Business, Specialty Industries and Specialty Products, representing an aggregation of OneBeacon’s specialty businesses based on those that are distributed through MGAs, those that are targeted to specific industries and those that offer targeted products. Currently, OneBeacon’s specialty lines products cover or include: professional liability, marine, collector cars and boats, property and inland marine, excess property, accident and health, technology, public entities, energy, entertainment, sports and leisure, tuition reimbursement and excess and surplus lines. In determining how to aggregate OneBeacon’s specialty businesses, management considered many factors, including the nature of its insurance products and services and the production processes, the types or classes of customers, methods of distribution and the regulatory environment.

The Other Insurance Operations segment includes AutoOne and the results of the non-specialty commercial lines business which was transferred to The Hanover and the traditional personal lines business which was sold in the Personal Lines Transaction, other run-off business which consists of national accounts, certain specialty programs and regional agency business transferred to Liberty Mutual Insurance Group effective November 1, 2001, and certain purchase accounting adjustments relating to the OneBeacon Acquisition.

Investing, Financing and Corporate Operations includes the investing and financing activities for OneBeacon on a consolidated basis, and certain other activities conducted through the Company and its intermediate holding company subsidiaries. Invested assets are not allocated to Specialty Insurance Operations or Other Insurance Operations since OneBeacon does not manage its assets by segment. Invested assets, net investment income and net realized and unrealized investment gains (losses) related to OneBeacon’s Specialty Insurance Operations and Other Insurance Operations segments are included in the Investing, Financing and Corporate Operations segment since these assets are available for payment of losses and expenses for all segments. Debt and the related interest expense on debt also are not allocated to or managed by segment and are included in the Investing, Financing and Corporate Operations segment.

Previously, OneBeacon reported and managed its business through an Insurance Operations segment and an Other Operations segment. Within the Insurance Operations segment, OneBeacon reported and managed its specialty lines businesses within a specialty lines underwriting unit and its traditional personal lines businesses and AutoOne within a personal lines underwriting unit, nearly all of which was subject to the Personal Lines Transaction. The Insurance Operations segment also included run-off business, which consisted primarily of non-specialty commercial lines business and other run-off business. Certain other activities conducted through the Company and its intermediate subsidiaries were included in the Other Operations segment. Investing and Financing activities were included within the Insurance Operations segment if they were owned or owed by insurance company legal entities or within the Other Operations segment if they were owned or owed by holding company legal entities.

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Financial information for OneBeacon’s segments follows:

	Specialty Insurance Operations			Other Insurance Operations			Investing, Financing and Corporate Operations			Total
	($ in millions)
Three months ended June 30, 2011
Earned premiums	$	246.9		$	18.1		$	—		$	265.0
Loss and LAE	(139.0		)	(12.8		)	—			(151.8		)
Policy acquisition expenses	(53.5		)	(1.9		)	—			(55.4		)
Other underwriting expenses	(42.0		)	(5.5		)	—			(47.5		)
Total underwriting income (loss)	12.4			(2.1		)	—			10.3
Net investment income	—			—			18.7			18.7
Net realized and unrealized investment gains	—			—			11.0			11.0
Net other revenues (expenses)	0.1			0.6			(12.2		)	(11.5		)
General and administrative expenses	(0.4		)	—			(2.2		)	(2.6		)
Interest expense on debt	—			—			(6.0		)	(6.0		)
Pre-tax income (loss)	$	12.1		$	(1.5	)	$	9.3		$	19.9
Three months ended June 30, 2010
Earned premiums	$	241.2		$	187.1		$	—		$	428.3
Loss and LAE	(143.1		)	(118.8		)	—			(261.9		)
Policy acquisition expenses	(50.9		)	(40.4		)	—			(91.3		)
Other underwriting expenses	(34.8		)	(23.7		)	—			(58.5		)
Total underwriting income	12.4			4.2			—			16.6
Net investment income	—			—			25.0			25.0
Net realized and unrealized investment losses	—			—			(14.4		)	(14.4		)
Net other revenues (expenses)	0.6			—			(10.6		)	(10.0		)
General and administrative expenses	(0.5		)	(0.2		)	(2.3		)	(3.0		)
Interest expense on debt	—			—			(7.9		)	(7.9		)
Pre-tax income (loss)	$	12.5		$	4.0		$	(10.2	)	$	6.3
Six months ended June 30, 2011
Earned premiums	$	488.8		$	39.7		$	—		$	528.5
Loss and LAE	(271.6		)	(24.8		)	—			(296.4		)
Policy acquisition expenses	(102.7		)	(3.7		)	—			(106.4		)
Other underwriting expenses	(88.4		)	(11.5		)	—			(99.9		)
Total underwriting income (loss)	26.1			(0.3		)	—			25.8
Net investment income	—			—			39.7			39.7
Net realized and unrealized investment gains	—			—			34.1			34.1
Net other revenues (expenses)	0.2			1.5			(12.4		)	(10.7		)
General and administrative expenses	(0.9		)	—			(4.0		)	(4.9		)
Interest expense on debt	—			—			(12.3		)	(12.3		)
Pre-tax income	$	25.4		$	1.2		$	45.1		$	71.7
Six months ended June 30, 2010
Earned premiums	$	477.1		$	404.4		$	—		$	881.5
Loss and LAE	(279.6		)	(316.0		)	—			(595.6		)
Policy acquisition expenses	(99.2		)	(89.6		)	—			(188.8		)
Other underwriting expenses	(75.9		)	(56.8		)	—			(132.7		)
Total underwriting income (loss)	22.4			(58.0		)	—			(35.6		)
Net investment income	—			—			53.3			53.3
Net realized and unrealized investment gains	—			—			28.0			28.0
Net other revenues (expenses)	0.8			—			(11.6		)	(10.8		)
General and administrative expenses	(0.8		)	(0.7		)	(5.8		)	(7.3		)
Interest expense on debt	—			—			(17.0		)	(17.0		)
Pre-tax income (loss)	$	22.4		$	(58.7	)	$	46.9		$	10.6

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	Specialty Insurance Operations		Other Insurance Operations		Investing, Financing and Corporate Operations		Total
	($ in millions)
June 30, 2011
Total investments	$	—	$	—	$	2,887.5	$	2,887.5
Reinsurance recoverable on paid and unpaid losses	60.9		1,781.2		—		1,842.1
Deferred acquisition costs	116.2		3.0		—		119.2
Ceded unearned premiums	10.3		15.9		—		26.2
Loss and LAE reserves	861.3		2,270.2		—		3,131.5
Unearned premiums	510.2		59.8		—		570.0
Debt	—		—		269.7		269.7
December 31, 2010
Total investments	$	—	$	—	$	3,266.0	$	3,266.0
Reinsurance recoverable on paid and unpaid losses	60.1		1,877.6		—		1,937.7
Deferred acquisition costs	111.3		3.2		—		114.5
Ceded unearned premiums	10.8		103.1		—		113.9
Loss and LAE reserves	841.5		2,454.0		—		3,295.5
Unearned premiums	475.3		152.2		—		627.5
Debt	—		—		419.6		419.6

The following tables provide net written premiums, earned premiums and ratios for OneBeacon’s insurance operations by segment and in total, as well as for the three major underwriting units within Specialty Insurance Operations, for the three and six months ended June 30, 2011 and 2010:

($ in millions)	MGA Business			Specialty Industries			Specialty Products			Specialty Insurance Operations			Other Insurance Operations(1)			Total
Three months ended June 30, 2011
Net written premiums	$	71.7		$	102.9		$	91.4		$	266.0		$	14.6		$	280.6
Earned premiums	68.3			83.7			94.9			246.9			18.1			265.0
Ratios:
Loss and LAE	53.3		%	50.9		%	63.2		%	56.3		%	n/m			57.3		%
Expense	41.6			40.4			35.1			38.7			n/m			38.8
Total GAAP combined	94.9		%	91.3		%	98.3		%	95.0		%	n/m			96.1		%
Three months ended June 30, 2010
Net written premiums	$	68.5		$	86.5		$	82.8		$	237.8		$	106.1		$	343.9
Earned premiums	67.2			73.8			100.2			241.2			187.1			428.3
Ratios:
Loss and LAE	54.5		%	52.7		%	67.4		%	59.3		%	63.5		%	61.1		%
Expense	35.7			40.4			31.9			35.4			34.2			35.0
Total GAAP combined	90.2		%	93.1		%	99.3		%	94.7		%	97.7		%	96.1		%
Six months ended June 30, 2011
Net written premiums	$	120.2		$	188.5		$	215.6		$	524.3		$	34.4		$	558.7
Earned premiums	134.3			164.6			189.9			488.8			39.7			528.5
Ratios:
Loss and LAE	49.4		%	53.9		%	61.4		%	55.6		%	n/m			56.1		%
Expense	41.8			41.4			35.2			39.1			n/m			39.0
Total GAAP combined	91.2		%	95.3		%	96.6		%	94.7		%	n/m			95.1		%
Six months ended June 30, 2010
Net written premiums	$	115.2		$	164.1		$	218.8		$	498.1		$	217.3		$	715.4
Earned premiums	130.4			146.3			200.4			477.1			404.4			881.5
Ratios:
Loss and LAE	51.3		%	55.8		%	65.4		%	58.6		%	78.1		%	67.6		%
Expense	37.6			40.8			33.2			36.7			36.2			36.5
Total GAAP combined	88.9		%	96.6		%	98.6		%	95.3		%	114.3		%	104.1		%

(1) As Other Insurance Operations consists primarily of business in run-off, GAAP ratios are not meaningful for the 2011 periods.

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NOTE 8. Variable Interest Entities

Reciprocals

Reciprocals are policyholder-owned insurance carriers organized as unincorporated associations. Each policyholder insured by the reciprocal shares risk with the other policyholders. Policyholders share profits and losses in the same proportion as the amount of insurance purchased but are not subject to assessment for net losses of the reciprocal.

OneBeacon had capitalized three reciprocals by loaning funds to them in exchange for surplus notes. In 2002, OneBeacon formed New Jersey Skylands Management LLC (“NJSM”) to provide management services for a fee to NJSIA, a reciprocal, and its wholly-owned subsidiary New Jersey Skylands Insurance Company (together, “New Jersey Skylands Insurance”). New Jersey Skylands Insurance was capitalized with a $31.3 million surplus note issued to OneBeacon in 2002. OneBeacon also loaned $0.2 million to New Jersey Skylands Insurance in the form of a security deposit. In 2004, OneBeacon formed Houston General Management Company to provide management services for a fee to another reciprocal, Houston General Insurance Exchange. During 2004, OneBeacon contributed $2.0 million of capital to Houston General Insurance Exchange. In 2005, OneBeacon contributed one of its subsidiaries, Houston General Insurance Company with assets of $149.4 million and liabilities of $127.6 million, to Houston General Insurance Exchange (together “Houston General Insurance”). Subsequent to the contribution of Houston General Insurance Company, Houston General Insurance Exchange issued a surplus note of $23.7 million to OneBeacon. In 2006, Adirondack AIF, LLC (“AAIF”), a wholly-owned subsidiary of OneBeacon, entered into an agreement to provide management services for a fee to Adirondack Insurance, a reciprocal. Adirondack Insurance was capitalized with a $70.7 million surplus note issued to OneBeacon in May 2006. Principal and interest on the surplus notes are repayable to OneBeacon only with regulatory approval. The obligation to repay principal on the notes is subordinated to all other liabilities including obligations to policyholders and claimants for benefits under insurance policies. OneBeacon has no ownership interest in the reciprocals.

Under the provisions of ASC 810, OneBeacon had determined that each of the reciprocals qualifies as a VIE. Further, OneBeacon had determined that it is the primary beneficiary as it has both the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and the obligation to absorb losses or receive benefits of the entity that could potentially be significant to the VIE as a result of the management services provided to the reciprocal and the funds loaned to it. Accordingly, OneBeacon consolidates Houston General Insurance and, until the completion of the Personal Lines Transaction in July 2010, consolidated New Jersey Skylands Insurance and Adirondack Insurance. As described in Note 2, the Personal Lines Transaction, which was completed in July 2010, included the sale of NJSM and AAIF and the transfer of the surplus notes issued by New Jersey Skylands Insurance and Adirondack Insurance. Completion of the Personal Lines Transaction triggered deconsolidation of New Jersey Skylands Insurance and Adirondack Insurance.

Subsequent to the Personal Lines Transaction, Houston General Insurance remains as OneBeacon’s only reciprocal. At June 30, 2011 and December 31, 2010, consolidated amounts related to Houston General Insurance included total assets of $113.1 million and $118.0 million, respectively, and total liabilities of $132.4 million and $136.2 million, respectively. At June 30, 2011, the net amount of capital at risk is equal to the surplus note of $23.7 million less the accumulated losses of $19.3 million which includes accrued interest on the surplus note of $15.7 million which eliminates in consolidation.

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NOTE 9. Retirement Plans

OneBeacon sponsors qualified and non-qualified, non-contributory, defined benefit pension plans covering substantially all employees who were employed as of December 31, 2001 and remain actively employed with OneBeacon. Current plans include a OneBeacon qualified pension plan (the “Qualified Plan”) and a OneBeacon non-qualified pension plan (the “Non-qualified Plan”) (collectively the “Plans”). OneBeacon’s Plans were frozen and curtailed in the fourth quarter of 2002.

The components of net periodic benefit cost for the three and six months ended June 30, 2011 and 2010 were as follows:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Service cost	$	0.2		$	0.2		$	0.4		$	0.4
Interest cost	1.3			1.5			2.6			3.0
Expected return on plan assets	(1.9		)	(1.9		)	(3.8		)	(3.8		)
Amortization of unrecognized loss	0.1			0.2			0.2			0.4
Net periodic pension income before special termination benefits expense	(0.3		)	—			(0.6		)	—
Special termination benefits expense(1)	0.2			0.2			0.4			0.4
Net periodic benefit (income) cost	$	(0.1	)	$	0.2		$	(0.2	)	$	0.4

(1) Special termination benefits represent additional payments made from the Qualified Plan to certain vested participants when their employment was terminated due to a reduction in force.

OneBeacon does not expect to make a contribution to its Qualified Plan in 2011. OneBeacon anticipates contributing $2.4 million to the Non-qualified Plan, for which OneBeacon has assets held in a rabbi trust. As of June 30, 2011, $1.2 million in contributions have been made to the Non-qualified Plan.

NOTE 10. Employee Share-Based Incentive Compensation Plans

OneBeacon’s share-based compensation plans consist of performance shares, stock options granted in connection with the initial public offering, restricted stock units and restricted shares. OneBeacon’s share-based compensation plans are designed to maximize shareholder value over long periods of time by aligning the financial interests of its management with those of its owners. Performance shares are payable only upon achievement of pre-defined business goals and are valued based on the market value of OneBeacon’s common shares at the time awards are earned. See “Performance Shares” below. Performance shares are typically paid in cash, though, in some instances, they may be paid in common shares or may be deferred in accordance with the terms of one of the deferred compensation plans of the Company’s subsidiaries. OneBeacon expenses the full cost of all its share-based compensation.

OneBeacon records its share-based compensation in accordance with ASC 718. ASC 718 applies to new grants of share-based awards, award modifications and the remaining portion of the fair value of unvested awards. The unvested portion of OneBeacon performance share awards, as well as the stock options granted in connection with the initial public offering and also restricted shares, are subject to the fair value measurement and recognition requirements of ASC 718.

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Performance Shares

The following summarizes performance share activity for performance shares whose value is based upon the market price of an underlying OneBeacon common share (“OB Performance Shares”) for the three and six months ended June 30, 2011 and 2010:

	Three months ended June 30,
	2011					2010
	Target OB Performance Shares outstanding		Accrued expense			Target OB Performance Shares outstanding		Accrued expense
	($ in millions)
Beginning of period	718,172		$	8.4		1,812,337		$	16.2
Payments and deferrals	—		—			—		—
New awards	—		—			6,449		—
Forfeitures and net change in assumed forfeitures	(46,445	)	(0.3		)	(48,363	)	(0.4		)
Expense (income) recognized	—		1.9			—		(0.6		)
End of period	671,727		$	10.0		1,770,423		$	15.2

	Six months ended June 30,
	2011					2010
	Target OB Performance Shares outstanding		Accrued expense			Target OB Performance Shares outstanding		Accrued expense
	($ in millions)
Beginning of period	1,464,295		$	18.5		2,224,215		$	15.1
Payments and deferrals (1)(2)	(936,150	)	(10.5		)	(682,344	)	(2.3		)
New awards	194,900		—			278,860		—
Forfeitures and net change in assumed forfeitures	(51,318	)	(0.3		)	(50,308	)	(0.4		)
Expense recognized	—		2.3			—		2.8
End of period	671,727		$	10.0		1,770,423		$	15.2

(1) Performance share payments in 2011 for the 2008-2010 performance cycle were based upon a performance factor of 68.5%. In addition, as a result of the Commercial Lines Transaction and the Personal Lines Transaction, payments were made to certain former employees of OneBeacon prior to the end of the performance cycle (2009-2011 and 2010-2012 performance cycles) on a pro rata basis based upon a performance factor of 100%.

(2) Performance share payments in 2010 for the 2007-2009 performance cycle were based upon a performance factor of 14.2%.

The following summarizes performance shares outstanding and accrued performance share expense at June 30, 2011 for each performance cycle:

	Target OB Performance Shares outstanding		Accrued expense
	($ in millions)
Performance cycle:
2009—2011	268,035		$	7.5
2010—2012	261,016		2.4
2011—2013	159,900		0.4
Sub-total	688,951		10.3
Assumed forfeitures	(17,224	)	(0.3		)
Total at June 30, 2011	671,727		$	10.0

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If 100% of the outstanding performance shares had been vested at June 30, 2011, the total additional compensation cost to be recognized would have been $5.7 million, based on accrual factors at June 30, 2011 (common share price and payout assumptions).

All performance shares earned and paid for the 2010-2012, 2009-2011, 2008-2010 and 2007-2009 performance cycles were settled in cash or by deferral into certain non-qualified deferred compensation plans of the Company’s subsidiaries.

Stock Options

As described in the Company’s 2010 Annual Report on Form 10-K, in November 2006, in connection with the initial public offering, OneBeacon issued to its key employees 1,420,000 options to acquire common shares of the Company at an above-market fixed exercise price. The following summarizes option activity for the three and six months ended June 30, 2011 and 2010:

	Three months ended June 30,
	2011				2010
	Target options outstanding		Expense amortized		Target options outstanding		Expense amortized
	($ in millions)
Beginning of period	768,652		$	4.6	916,827		$	4.0
Forfeitures	(18,522	)	—		(37,044	)	—
Expense recognized	—		0.2		—		0.1
End of period	750,130		$	4.8	879,783		$	4.1

	Six months ended June 30,
	2011				2010
	Target options outstanding		Expense amortized		Target options outstanding		Expense amortized
	($ in millions)
Beginning of period	768,652		$	4.5	1,015,610		$	3.6
Forfeitures	(18,522	)	—		(37,044	)	—
Vested and expired (1)	—		—		(98,783	)	—
Expense recognized	—		0.3		—		0.5
End of period	750,130		$	4.8	879,783		$	4.1

(1) During the six months ended June 30, 2010, 98,783 options vested as a result of the Commercial Lines Transaction were unexercised and expired.

The options vest in equal installments on each of the third, fourth and fifth anniversaries of their issuance. These options expire five and a half years from the anniversary of issuance. The fair value of each option award at grant date was estimated using a Black-Scholes option pricing model using an expected volatility assumption of 30%, a risk-free interest rate assumption of 4.6%, a forfeiture assumption of 5%, an expected dividend rate assumption of 3.4% and an expected term assumption of 5.5 years. The options originally had a per share exercise price of $30.00. On May 27, 2008, the Compensation Committee of the Board (the “Compensation Committee”) amended the exercise price to $27.97 as a result of the $2.03 per share special dividend paid in the first quarter of 2008. On November 16, 2010, the Compensation Committee adjusted the exercise price to $25.47 as a result of the $2.50 per share special dividend paid in the third quarter of 2010. The compensation expense associated with the options and the incremental fair value of the award modifications are being recognized ratably over the remaining period.

Restricted Stock Units

The options granted in connection with OneBeacon’s initial public offering did not include a mechanism in the options to reflect the contribution to total return from the regular quarterly dividend. As a result, on February 26, 2008, OneBeacon granted 116,270 Restricted Stock Units (“RSUs”) to actively employed option holders. Consistent with the terms of the RSU plan, the first and second tranches of RSUs vested by the 2010 vesting date, were deferred into one of the non-qualified deferred compensation plans of the Company’s subsidiaries and will be paid out in 2012 in cash or shares at the discretion of the Compensation Committee. The third tranche of RSUs will vest on November 9, 2011 subject to various factors including but not limited to the attainment of growth of 4% per cycle in adjusted book value per share. The expense associated with the RSUs is being recognized over the vesting period. For the three and six months ended June 30, 2011, OneBeacon recognized $0.1 million and $0 million, respectively, in expense. For the three and six months ended June 30, 2010, OneBeacon recognized $0 and $0.2 million, respectively, in expense. As of June 30, 2011, there were 23,057 RSUs outstanding to actively employed option holders.

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Restricted Shares

On May 25, 2011, OneBeacon issued 630,000 shares of restricted stock to its CEO that vest in equal installments on February 22, 2014, 2015, 2016 and 2017. Concurrently with the grant of the restricted stock, 35,000 performance shares issued to the CEO for the 2011-2013 performance share cycle were forfeited. Performance share awards to the CEO for the next five years will be reduced by a similar number of shares. The restricted shares contain dividend participation features, and therefore, are considered participating securities. At June 30, 2011, the Company had 630,000 unvested restricted shares outstanding. During the three months ended June 30, 2011, OneBeacon recognized $0.1 million in expense. As of June 30, 2011, the unrecognized compensation cost associated with the outstanding restricted share awards was $8.5 million, to be recognized ratably over the remaining vesting periods. Upon vesting, all restrictions initially placed upon the restricted shares lapse.

NOTE 11. Income Taxes

OneBeacon and its Bermuda-domiciled subsidiaries are not subject to Bermuda income tax under current Bermuda law. In the event that there is a change in the current law such that taxes are imposed, OneBeacon and its Bermuda-domiciled subsidiaries would be exempt from such tax until March 28, 2016, pursuant to the Bermuda Exempted Undertakings Tax Protection Act of 1966. OneBeacon also has subsidiaries that operate in Gibraltar, Luxembourg and the United States. U.S. operations are financed with a combination of debt and equity and the financing income currently accounts for the majority of non-U.S. income.

OneBeacon’s income tax expense (benefit) related to pre-tax income for the three months ended June 30, 2011 and 2010 represented net effective tax rates of 19.6% and (44.4)%, respectively. The net effective tax rates for the six months ended June 30, 2011 and 2010 were 18.7% and 11.3%, respectively. The effective tax rate for the three and six months ended June 30, 2011 were lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income taxed in a jurisdiction with a lower effective tax rate. The effective tax rate for the three and six months ended June 30, 2010 were lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income taxed in a jurisdiction with a lower effective tax rate, and recognition of a deferred tax asset for a higher tax basis in the companies sold as part of the Personal Lines Transaction, partially offset by an increase in the valuation allowance for insurance reciprocals. For the three months ended June 30, 2011 and 2010, the effective tax rate on non-U.S. income was 4.1% and 0.4%, respectively, and the effective tax rate on U.S. income was 237.5% and 19.4%, respectively. For the six months ended June 30, 2011 and 2010, the effective tax rate on non-U.S. income was 2.4% and 0.5%, respectively, and the effective tax rate on U.S. income (loss) was 37.4% and (3.4)%, respectively.

In arriving at the effective tax rate for the three and six months ended June 30, 2011 and 2010, OneBeacon forecasted the change in net realized and unrealized investment gains or losses for the years ending December 31, 2011 and 2010, respectively, and included these gains or losses in the effective tax rate calculation pursuant to ASC 740-270.

OneBeacon classifies all interest and penalties on unrecognized tax benefits as part of income tax expense. With few exceptions, OneBeacon is no longer subject to U.S. federal, state or non-U.S. income tax examinations by tax authorities for years before 2005. In October 2008, the IRS commenced examination of OneBeacon’s U.S. income tax returns for 2005 and 2006. On January 5, 2011, OneBeacon received a revised Form 4549-A (Income Tax Discrepancy Adjustments) from the IRS relating to the examination of tax years 2005 and 2006. The estimated total assessment, including interest and utilization of alternative minimum and foreign tax credit carryovers, is $18.7 million. OneBeacon disagrees with the adjustments proposed by the IRS and intends to defend its position. The timing of the resolution of these issues is uncertain, however, it is reasonably possible that the resolution could occur within the next twelve months. An estimate of the range of potential outcomes cannot be made at this time. When ultimately settled, OneBeacon does not expect the resolution of this examination to result in a material change to its financial position.

The IRS also examined the U.S. income tax return filed by WM Belvaux S.à.r.l., a Luxembourg company, for tax year 2007. On May 3, 2011, the exam was completed with no proposed adjustments.

NOTE 12. Fair Value of Financial Instruments

ASC 825 requires disclosure of fair value information of financial instruments. For certain financial instruments where quoted market prices are not available, other independent valuation techniques and assumptions are used. Because considerable judgment is used, these estimates are not necessarily indicative of amounts that could be realized in a current market exchange. Certain financial instruments are excluded from disclosure, including insurance contracts, other than financial guarantees and investment contracts. OneBeacon carries its financial instruments on its balance sheet at fair value with the exception of its fixed-rate, long-term indebtedness.

The fair values of the fixed-rate, long-term indebtedness were estimated by discounting future cash flows using current market rates for similar obligations or using quoted market prices. Considerable judgment is required to develop such estimates of fair

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value. Therefore, the estimate provided herein is not necessarily indicative of the amounts that could be realized in a current market exchange.

At June 30, 2011 and December 31, 2010, the fair value of OneBeacon’s Senior Notes (its fixed-rate, long-term indebtedness) was $282.2 million and $435.1 million, respectively, which compared to a carrying value of $269.7 million and $419.6 million, respectively.

NOTE 13. Earnings per Share

Basic and diluted earnings per share amounts have been determined in accordance with ASC 260, based on the weighted average number of common shares outstanding including unvested restricted shares that are considered participating securities (see Note 10). During the second quarters of 2011 and 2010, 21,980 and 20,068 shares, respectively, of the Company’s Class A common shares were awarded to certain non-employee members of the Company’s Board, in lieu of their 2011 and 2010 annual cash retainers. During the third quarter of 2007, the Company began a share repurchase program. Since the inception of this program, the Company has repurchased and retired 5.6 million of its Class A common shares. During the six months ended June 30, 2011, no shares were repurchased. During the three and six months ended June 30, 2010, the Company repurchased and retired 0.4 million of its Class A common shares for $5.9 million.

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Earnings attributable to OneBeacon’s common shareholders — basic and diluted (in millions):
Net income attributable to OneBeacon’s common shareholders	$	15.5		$	8.6		$	57.4		$	8.6
Dividends declared and paid	(115.1		)	(19.9		)	(134.9		)	(39.9		)
Overdistribution of current period earnings	$	(99.6	)	$	(11.3	)	$	(77.5	)	$	(31.3	)

Weighted average common shares outstanding	94.4			95.0			94.4			95.1
Weighted average unvested restricted shares(1)	0.3			—			0.1			—
Total(2)	94.7			95.0			94.5			95.1

Earnings per share attributable to OneBeacon’s common shareholders — basic and diluted (in dollars):
Net income attributable to OneBeacon’s common shareholders	$	0.16		$	0.09		$	0.61		$	0.09
Dividends declared and paid	(1.21		)	(0.21		)	(1.42		)	(0.42		)
Overdistribution of current period earnings	$	(1.05	)	$	(0.12	)	$	(0.81	)	$	(0.33	)

(1) Restricted shares outstanding vest in equal installments upon a stated date or upon the occurrence of a specified event (see Note 10).

(2) Common shares issuable upon exercise of the options (see Note 10) were not included as their inclusion would be anti-dilutive for the periods presented.

NOTE 14. Common Shareholders’ Equity

Dividends on Common Shares

During the six months ended June 30, 2011, the Company declared and paid cash dividends totaling $134.9 million, or $1.42 per common share, including $39.8 million, or $0.42 per common share, of regular quarterly cash dividends and $95.1 million, or $1.00 per common share, of a special dividend. During the six months ended June 30, 2010, the Company declared and paid cash dividends totaling $39.9 million, or $0.42 per common share, of regular quarterly cash dividends.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion contains “forward-looking statements.” Statements that are not historical in nature are forward-looking statements. OneBeacon cannot promise that its expectations in such forward-looking statements will turn out to be correct. OneBeacon’s actual results could be materially different from and worse than its expectations. See “Forward-Looking Statements” on page 53 for specific important factors that could cause actual results to differ materially from those contained in forward-looking statements.

Book Value Per Share

The following table presents our book value per share.

	June 30,		March 31,		December 31,
	2011		2011		2010
	(in millions, except per share amounts)
Numerator
OneBeacon’s common shareholders’ equity	$	1,152.3	$	1,251.3	$	1,229.0

Denominator
Common shares outstanding (1)	95.1		94.4		94.4

Book value per share	$	12.12	$	13.26	$	13.02

(1)	Common shares outstanding includes the impact of unvested restricted shares and also the impact of repurchases of Class A common shares made through the Company’s share repurchase program.

We ended the second quarter of 2011 with a book value per share of $12.12, reflecting an increase of 0.5% for the second quarter of 2011 and 4.1% through the six months ended June 30, 2011, including dividends (a quarterly dividend of $0.21 per share and a special dividend of $1.00 per share paid in June 2011), on an internal rate of return basis. Results for the quarter and through the six months ended June 30, 2011 were adversely impacted by the debt tender completed in April and the shares of restricted stock granted in May. The increase in book value per share includes a 1.0% and 2.5% total return on invested assets for the three and six months ended June 30, 2011, respectively. We reported comprehensive income attributable to OneBeacon’s common shareholders of $15.5 million and $57.5 million, respectively, in the three and six months ended June 30, 2011, compared to comprehensive income attributable to OneBeacon’s common shareholders of $8.6 million and $8.8 million, respectively, in the same periods of 2010. The increase in the quarter as compared to the prior year was primarily due to improved investment results. The increase through the six months ended June 30, 2011 as compared to the prior year was due primarily to improved underwriting results principally due to decreased current accident year losses, both catastrophe and non-catastrophe, as described below.

Our GAAP combined ratios were 96.1% and 95.1% for the three and six months ended June 30, 2011, respectively, compared to 96.1% and 104.1% for the three and six months ended June 30, 2010, respectively. The combined ratio for the three months ended June 30, 2011 was unchanged as compared with the prior year period as lower current accident year non-catastrophe losses were offset by higher current accident year catastrophe losses and the impact of other underwriting expenses on a lower earned premium base as a result of the Commercial Lines Transaction and Personal Lines Transaction described below, as compared to the three months ended June 30, 2010 which included a number of large losses, particularly in businesses that we have exited. The three months ended June 30, 2011 included 5.2 points of current accident year catastrophe losses primarily related to tornados in the southeastern and midwestern United States, compared to 2.3 points of current accident year catastrophe losses primarily related to severe wind and rainstorms in a number of states in the three months ended June 30, 2010. The decrease in the combined ratio for the six months ended June 30, 2011 was primarily due to lower current accident year non-catastrophe and catastrophe losses, as compared to the six months ended June 30, 2010, partially offset by the impact of other underwriting expenses on a lower earned premium base as a result of the Commercial Lines Transaction and Personal Lines Transaction described below. The six months ended June 30, 2011 included 4.0 points of current accident year catastrophe losses primarily related to tornados in the southeastern and midwestern United States as well as storms and freezing weather in the northeastern and southwestern United States, compared to 6.1 points of current accident year catastrophe losses primarily related to the March storms in the northeastern United States in the six months ended June 30, 2010. The six months ended June 30, 2010 also included a number of non-catastrophe large losses. Total net written premiums decreased 18.4% in the three months ended June 30, 2011 to $280.6 million, compared to $343.9 million for the three months ended June 30, 2010. Total net written premiums decreased 21.9% in the six months ended June 30, 2011 to $558.7 million, compared to $715.4 million for the six months ended June 30, 2010. The decrease in net written premiums was primarily due to the Personal Lines Transaction described below.

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Significant Transactions

Historically, we have offered a range of specialty, commercial and personal products and services, however, in the wake of recent transactions we are now focused exclusively on specialty business. In addition, the transactions freed up significant capital, increased our financial flexibility and substantially reduced our catastrophe exposure.

Commercial lines. On December 3, 2009, we sold the renewal rights to our non-specialty commercial lines business to The Hanover Insurance Group (The Hanover) (the Commercial Lines Transaction). The transaction included small commercial accounts and the non-specialty portion of the middle-market business, beginning with January 1, 2010 effective dates. We continue to manage claims from business written prior to the Commercial Lines Transaction. Through June 30, 2010, we also managed claims from business fronted by OneBeacon and reinsured to The Hanover. We continue to provide claims system access and first notice of loss service to The Hanover. The Hanover reimburses us for our expenses incurred to provide the claims administration services.

Personal lines. On July 1, 2010, we completed the sale of our traditional personal lines business to Tower Group, Inc. (Tower) (the Personal Lines Transaction). The Personal Lines Transaction included two insurance companies through which the majority of the traditional personal lines business was written on a direct basis, two attorneys-in-fact managing the reciprocals that wrote the traditional personal lines business in New York and New Jersey, the surplus notes issued by the New York and New Jersey reciprocals and the remaining renewal rights to certain other traditional personal lines insurance policies. In addition, the Personal Lines Transaction included the execution of reinsurance agreements with certain subsidiaries of the Company pursuant to which we cede, on a 100% quota share basis, traditional personal lines business not directly written by companies included in the sale and assume, on a 100% quota share basis, non-traditional personal lines business written directly by York Insurance Company of Maine. OneBeacon and Tower also entered into a Transition Services Agreement (TSA), pursuant to which we provide certain services to Tower during the three-year term of the TSA. Tower reimburses us for all of our expenses incurred to provide these services. Reimbursement for these services is netted against the expense incurred.

Recent Developments

To better align our operating and reporting structure with our business profile as a result of the transactions, we revised our segment structure into Specialty Insurance Operations, Other Insurance Operations and Investing, Financing and Corporate Operations. As part of the resegmentation, agency results for business written on our paper and in which we have an ownership interest have been reclassified within underwriting results. Previously, we reported and managed our business through an Insurance Operations segment and an Other Operations segment. Within the Insurance Operations segment, we reported and managed our specialty lines businesses within a specialty lines underwriting unit and our traditional personal lines businesses and AutoOne Insurance (AutoOne) within a personal lines underwriting unit, nearly all of which was subject to the Personal Lines Transaction. The Insurance Operations segment also included run-off business, which consisted primarily of non-specialty commercial lines business and other run-off business. Certain other activities conducted through the Company and our intermediate subsidiaries were included in our Other Operations segment. Investing and Financing activities were included within the Insurance Operations segment if they were owned or owed by insurance company legal entities or within the Other Operations segment if they were owned or owed by holding company legal entities. The prior periods have been reclassified to conform to the current presentation.

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Results of Operations

Review of Consolidated Results

A summary of our consolidated financial results for the three and six months ended June 30, 2011 and 2010 is as follows:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Net written premiums	$	280.6		$	343.9		$	558.7		$	715.4
Revenues
Earned premiums	$	265.0		$	428.3		$	528.5		$	881.5
Net investment income	18.7			25.0			39.7			53.3
Net realized and unrealized investment gains (losses)	11.0			(14.4		)	34.1			28.0
Net other expenses	(11.5		)	(10.0		)	(10.7		)	(10.8		)
Total revenues	283.2			428.9			591.6			952.0
Expenses
Loss and LAE	151.8			261.9			296.4			595.6
Policy acquisition expenses	55.4			91.3			106.4			188.8
Other underwriting expenses	47.5			58.5			99.9			132.7
General and administrative expenses	2.6			3.0			4.9			7.3
Interest expense on debt	6.0			7.9			12.3			17.0
Total expenses	263.3			422.6			519.9			941.4
Pre-tax income	19.9			6.3			71.7			10.6
Income tax (expense) benefit	(3.9		)	2.8			(13.4		)	(1.2		)
Net income including noncontrolling interests	16.0			9.1			58.3			9.4
Less: Net income attributable to noncontrolling interests	(0.5		)	(0.5		)	(0.9		)	(0.8		)
Net income attributable to OneBeacon’s common shareholders	15.5			8.6			57.4			8.6
Change in other comprehensive income and loss items	—			—			0.1			0.2
Comprehensive income attributable to OneBeacon’s common shareholders	$	15.5		$	8.6		$	57.5		$	8.8

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The following table provides ratios of our consolidated underwriting results for the three and six months ended June 30, 2011 and 2010:

	Three months ended June 30,				Six months ended June 30,
	2011		2010		2011		2010
Ratios:(1)(2)(3)(4)
Loss and LAE	57.3	%	61.1	%	56.1	%	67.6	%
Expense	38.8		35.0		39.0		36.5
Total GAAP combined	96.1	%	96.1	%	95.1	%	104.1	%

(1) As part of the resegmentation, agency results for business written on OneBeacon paper and in which OneBeacon has an ownership interest have been reclassified within the underwriting results. Financial information for the prior periods has been reclassified to conform to this presentation.

(2) Includes our long-term incentive compensation expense. For the three months ended June 30, 2011 and 2010, long-term incentive compensation expense increased our total combined ratio by 1.9 points and 0.9 points, respectively. For the six months ended June 30, 2011 and 2010, long-term incentive compensation expense increased our total combined ratio by 1.9 points and 1.8 points, respectively.

(3) Includes loss and LAE relating to catastrophes. For the three months ended June 30, 2011 and 2010, total calendar year incurred loss and LAE relating to catastrophes increased our loss and LAE and total combined ratios by 5.2 points and 2.3 points, respectively, including development on prior accident year catastrophes which had no impact on our loss and LAE and total combined ratios. For the six months ended June 30, 2011 and 2010, total calendar year incurred loss and LAE relating to catastrophes increased our loss and LAE and total combined ratios by 4.5 points and 6.1 points, respectively, including development on prior accident year catastrophes which increased our loss and LAE and total combined ratios by 0.5 points and 0, respectively.

(4) Prior accident year development, including development on catastrophes, for the three months ended June 30, 2011 and 2010 decreased our loss and LAE and total combined ratios by 3.8 points and 4.3 points, respectively. Prior accident year development, including development on catastrophes, for the six months ended June 30, 2011 and 2010 decreased our loss and LAE and total combined ratios by 2.9 points and 2.7 points, respectively.

Consolidated Results—Three months ended June 30, 2011 versus three months ended June 30, 2010

Our comprehensive income attributable to OneBeacon’s common shareholders was $15.5 million in the three months ended June 30, 2011, compared to $8.6 million in the three months ended June 30, 2010. Net income attributable to OneBeacon’s common shareholders was $15.5 million in the three months ended June 30, 2011, compared to $8.6 million in the three months ended June 30, 2010.

Our total revenues decreased 34.0% to $283.2 million in the three months ended June 30, 2011, compared to $428.9 million in the three months ended June 30, 2010. The decrease included a 38.1% reduction in earned premiums primarily due to the Personal Lines Transaction and the Commercial Lines Transaction. Net realized and unrealized investment gains (losses) increased 176.4% to $11.0 million, compared to $(14.4) million in the three months ended June 30, 2010. Net investment income decreased 25.2% to $18.7 million in the three months ended June 30, 2011 due to a 22.1% decline in average invested assets. The decline in average invested assets since June 30, 2010 was driven by the Personal Lines Transaction, return of capital to shareholders, repurchases of debt and the Commercial Lines Transaction, including the impact of claim payments related to non-specialty commercial lines reserves. Net other expenses increased to $11.5 million in the three months ended June 30, 2011, compared to $10.0 million in the three months ended June 30, 2010. The slight increase reflects a $12.0 million loss related to the purchase of a portion of our senior notes in the three months ended June 30, 2011, as compared to a $10.3 million loss related to the purchase of a portion of our senior notes in the three months ended June 30, 2010. During the three months ended June 30, 2011, we repurchased and retired $150.0 million aggregate principal of senior notes as a result of a cash tender offer. During the three months ended June 30, 2010, we repurchased and retired $174.6 million aggregate principal amount of senior notes, including $156.4 million as a result of a cash tender offer.

Our total expenses decreased 37.7% in the three months ended June 30, 2011 to $263.3 million, compared to $422.6 million in the three months ended June 30, 2010. Loss and LAE decreased 42.0% to $151.8 million in the three months ended June 30, 2011, reflective of the decrease in our book of business resulting from the Commercial Lines Transaction and Personal Lines Transaction, partially offset by higher current accident year catastrophe losses. Current accident year catastrophe losses were $13.7 million in the three months ended June 30, 2011, compared to $9.8 million in the three months ended June 30, 2010. Policy acquisition expenses

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decreased 39.3% to $55.4 million and other underwriting expenses decreased 18.8% to $47.5 million in the three months ended June 30, 2011, reflective of the shrink in our book of business resulting from the Commercial Lines Transaction and Personal Lines Transaction. General and administrative expenses decreased 13.3% to $2.6 million. Interest expense decreased 24.1% to $6.0 million in line with the reduction in outstanding debt.

Our income tax expense (benefit) related to pre-tax income for the three months ended June 30, 2011 and 2010 represented net effective tax rates of 19.6% and (44.4)%, respectively. The effective tax rate for the three months ended June 30, 2011 was lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income taxed in a jurisdiction with a lower effective tax rate. The effective tax rate for the three months ended June 30, 2010 was lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income taxed in a jurisdiction with a lower effective tax rate, and recognition of a deferred tax asset for a higher tax basis in the companies sold as part of the Personal Lines Transaction, partially offset by an increase in the valuation allowance for insurance reciprocals. For the three months ended June 30, 2011 and 2010, the effective tax rate on non-U.S. income was 4.1% and 0.4%, respectively, and the effective tax rate on U.S. income was 237.5% and 19.4%, respectively. In arriving at the effective tax rate for the three months ended June 30, 2011 and 2010, we forecasted the change in net realized and unrealized investment gains or losses for the years ending December 31, 2011 and 2010, respectively, and included these gains or losses in the effective tax rate calculation pursuant to ASC 740-270.

Our GAAP combined ratio for the three months ended June 30, 2011 was unchanged at 96.1% from the three months ended June 30, 2010. The loss and LAE ratio decreased by 3.8 points to 57.3% while the expense ratio increased by 3.8 points to 38.8%. The decrease in the loss and LAE ratio was primarily due to a decrease in current accident year non-catastrophe losses. We experienced a number of large losses in our property and inland marine business within Specialty Insurance Operations during the three months ended June 30, 2010. The decrease was partially offset by current accident year catastrophe losses and less favorable loss reserve development. The three months ended June 30, 2011 included $13.7 million or 5.2 points of current accident year catastrophe losses, as compared to $9.8 million or 2.3 points of current accident year catastrophe losses in the three months ended June 30, 2010. The three months ended June 30, 2011 included $10.1 million or 3.8 points of favorable loss reserve development, as compared to $18.3 million or 4.3 points of favorable loss reserve development in the three months ended June 30, 2010. The favorable loss reserve development was primarily related to lower than expected severity on non-catastrophe losses on professional liability lines, multiple peril liability lines and other general liability lines. The favorable development in the three months ended June 30, 2010 also included a one-time $6.5 million release of commercial and personal auto reserves associated with participation in an involuntary auto pool. The expense ratio increased primarily due to other underwriting expenses that have not decreased proportionately with the reduction in earned premium associated with the exited businesses, partially offset by a decrease in policy acquisition expenses.

Consolidated Results—Six months ended June 30, 2011 versus six months ended June 30, 2010

Our comprehensive income attributable to OneBeacon’s common shareholders was $57.5 million in the six months ended June 30, 2011, compared to $8.8 million in the six months ended June 30, 2010. Net income attributable to OneBeacon’s common shareholders was $57.4 million in the six months ended June 30, 2011, compared to $8.6 million in the six months ended June 30, 2010.

Our total revenues decreased 37.9% to $591.6 million in the six months ended June 30, 2011, compared to $952.0 million in the six months ended June 30, 2010. The decrease included a 40.0% reduction in earned premiums primarily due to the Personal Lines Transaction and the Commercial Lines Transaction. Net realized and unrealized investment gains increased 21.8% to $34.1 million, compared to $28.0 million in the six months ended June 30, 2010. Net investment income decreased 25.5% to $39.7 million in the six months ended June 30, 2011 due to a 21.3% decline in average invested assets. The decline in average invested assets since June 30, 2010 was driven by the Personal Lines Transaction, return of capital to shareholders, repurchases of debt and the Commercial Lines Transaction, including the impact of claim payments related to non-specialty commercial lines reserves. Net other expenses decreased 0.9% to $10.7 million in the six months ended June 30, 2011, compared to $10.8 million in the six months ended June 30, 2010. The six months ended June 30, 2011 includes a $12.0 million loss related to the purchase of a portion of our senior notes, partially offset by $0.8 million in additional consideration for aggregate premium renewals exceeding $200 million related to the Commercial Lines Transaction, as compared to a $10.8 million loss related to the purchase of a portion of our senior notes in the six months ended June 30, 2010.

Our total expenses decreased 44.8% in the six months ended June 30, 2011 to $519.9 million, compared to $941.4 million in the six months ended June 30, 2010. Loss and LAE decreased 50.2% to $296.4 million in the six months ended June 30, 2011, reflective of the decrease in our book of business resulting from the Commercial Lines Transaction and Personal Lines Transaction, as well as lower current accident year catastrophe losses. Current accident year catastrophe losses were $21.0 million in the six months ended June 30, 2011, compared to $54.1 million in the six months ended June 30, 2010. The six months ended June 30, 2010, also included a number of large losses, particularly in businesses we have exited as well as our property and inland marine business. Policy

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acquisition expenses decreased 43.6% to $106.4 million and other underwriting expenses decreased 24.7% to $99.9 million in the six months ended June 30, 2011, reflective of the shrink in our book of business resulting from the Commercial Lines Transaction and Personal Lines Transaction. The six months ended June 30, 2010 included amortization of previously deferred acquisition costs within the non-specialty commercial lines business as a result of the Commercial Lines Transaction. Additionally, there were also changes in the overall mix of business and the mix of products offered within the businesses, partially offset by changes in the deferral rate of policy acquisition expenses to better align with the individual products within the respective businesses. General and administrative expenses decreased 32.9% to $4.9 million. Interest expense decreased 27.6% in line with the reduction in outstanding debt.

Our income tax expense related to pre-tax income for the six months ended June 30, 2011 and 2010 represented net effective tax rates of 18.7% and 11.3%, respectively. The effective tax rate for the six months ended June 30, 2011 was lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income taxed in a jurisdiction with a lower effective tax rate. The effective tax rate for the six months ended June 30, 2010 was lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income taxed in a jurisdiction with a lower effective tax rate, and recognition of a deferred tax asset for a higher tax basis in the companies sold as part of the Personal Lines Transaction, partially offset by an increase in the valuation allowance for insurance reciprocals. For the six months ended June 30, 2011 and 2010, the effective tax rate on non-U.S. income was 2.4% and 0.5%, respectively, and the effective tax rate on U.S. income (loss) was 37.4% and (3.4)%, respectively. In arriving at the effective tax rate for the six months ended June 30, 2011 and 2010, we forecasted the change in net realized and unrealized investment gains or losses for the years ending December 31, 2011 and 2010, respectively, and included these gains or losses in the effective tax rate calculation pursuant to ASC 740-270.

Our GAAP combined ratio for the six months ended June 30, 2011 decreased to 95.1% from 104.1% for the six months ended June 30, 2010. The loss and LAE ratio decreased by 11.5 points to 56.1% while the expense ratio increased by 2.5 points to 39.0%. As described above, the decrease in the loss and LAE ratio was primarily due to a decrease in current accident year non-catastrophe losses, as well as catastrophe losses. The six months ended June 30, 2011 include $21.0 million or 4.0 points of current accident year catastrophe losses, as compared to $54.1 million or 6.1 points of current accident year catastrophe losses in the six months ended June 30, 2010. We also experienced a number of large losses in our property and inland marine business within Specialty Insurance Operations and in our non-specialty commercial lines business within Other Insurance Operations during the six months ended June 30, 2010. The six months ended June 30, 2011 included $15.2 million or 2.9 points of favorable loss reserve development, as compared to $24.3 million or 2.7 points of favorable loss reserve development in the six months ended June 30, 2010. The favorable loss reserve development was primarily related to lower than expected severity on non-catastrophe losses related to professional liability lines, multiple peril liability lines and other general liability lines. The favorable development also included a one-time $6.5 million release of commercial and personal auto reserves associated with participation in an involuntary auto pool. The expense ratio increased primarily due to other underwriting expenses that have not decreased proportionately with the reduction in earned premium associated with the exited businesses, partially offset by a decrease in policy acquisition expenses.

Summary of Operations By Segment

Specialty Insurance Operations is comprised of twelve underwriting units that are aggregated into three major underwriting units: MGA Business, Specialty Industries and Specialty Products. Other Insurance Operations includes AutoOne, the non-specialty commercial lines business and traditional personal lines business, other run-off business and certain purchase accounting adjustments relating to the OneBeacon Acquisition. Investing, Financing and Corporate Operations includes the investing and financing activities for OneBeacon on a consolidated basis, and certain other activities conducted through our holding companies. The prior periods have been reclassified to conform to the current presentation. Our segment information is presented in Note 7—“Segment Information” of the accompanying consolidated financial statements.

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Specialty Insurance Operations

Financial results for our Specialty Insurance Operations segment for the three and six months ended June 30, 2011 and 2010 are as follows:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Net written premiums	$	266.0		$	237.8		$	524.3		$	498.1
Earned premiums	$	246.9		$	241.2		$	488.8		$	477.1
Loss and LAE	(139.0		)	(143.1		)	(271.6		)	(279.6		)
Policy acquisition expenses	(53.5		)	(50.9		)	(102.7		)	(99.2		)
Other underwriting expenses	(42.0		)	(34.8		)	(88.4		)	(75.9		)
Total underwriting income	12.4			12.4			26.1			22.4
Net other revenues	0.1			0.6			0.2			0.8
General and administrative expenses	(0.4		)	(0.5		)	(0.9		)	(0.8		)
Pre-tax income	$	12.1		$	12.5		$	25.4		$	22.4

The following table provides net written premiums, earned premiums and underwriting ratios by major underwriting unit and Specialty Insurance Operations in total for the three and six months ended June 30, 2011 and 2010:


($ in millions)	MGA Business			Specialty Industries			Specialty Products			Specialty Insurance Operations

Three months ended June 30, 2011
Net written premiums	$	71.7		$	102.9		$	91.4		$	266.0
Earned premiums	68.3			83.7			94.9			246.9
Ratios:(1)(2)(3)
Loss and LAE	53.3		%	50.9		%	63.2		%	56.3		%
Expense	41.6			40.4			35.1			38.7
Total GAAP combined	94.9		%	91.3		%	98.3		%	95.0		%
Three months ended June 30, 2010
Net written premiums	$	68.5		$	86.5		$	82.8		$	237.8
Earned premiums	67.2			73.8			100.2			241.2
Ratios:(1)(2)(3)
Loss and LAE	54.5		%	52.7		%	67.4		%	59.3		%
Expense	35.7			40.4			31.9			35.4
Total GAAP combined	90.2		%	93.1		%	99.3		%	94.7		%
Six months ended June 30, 2011
Net written premiums	$	120.2		$	188.5		$	215.6		$	524.3
Earned premiums	134.3			164.6			189.9			488.8
Ratios:(1)(2)(3)
Loss and LAE	49.4		%	53.9		%	61.4		%	55.6		%
Expense	41.8			41.4			35.2			39.1
Total GAAP combined	91.2		%	95.3		%	96.6		%	94.7		%
Six months ended June 30, 2010
Net written premiums	$	115.2		$	164.1		$	218.8		$	498.1
Earned premiums	130.4			146.3			200.4			477.1
Ratios:(1)(2)(3)
Loss and LAE	51.3		%	55.8		%	65.4		%	58.6		%
Expense	37.6			40.8			33.2			36.7
Total GAAP combined	88.9		%	96.6		%	98.6		%	95.3		%
												_

(1) Includes our long-term incentive compensation expense. For the three months ended June 30, 2011 and 2010, long-term incentive compensation expense increased our Specialty Insurance Operations combined ratio by 1.8 points and 1.2 points, respectively. For each of the six months ended June 30, 2011 and 2010, long-term incentive compensation expense increased our Specialty Insurance Operations combined ratio by 1.9 points.

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(2) Includes loss and LAE relating to catastrophes. For the three months ended June 30, 2011 and 2010, total calendar year incurred loss and LAE relating to catastrophes increased our Specialty Insurance Operations loss and LAE and total combined ratios by 5.5 points and 4.1 points, respectively, including development on prior accident year catastrophes which decreased our Specialty Insurance Operations loss and LAE and total combined ratios by 0 and 0.1 points, respectively. For the six months ended June 30, 2011 and 2010, total calendar year incurred loss and LAE relating to catastrophes increased our Specialty Insurance Operations loss and LAE and total combined ratios by 4.6 points and 4.3 points, respectively, including development on prior accident year catastrophes which increased our Specialty Insurance Operations loss and LAE and total combined ratios by 0.3 points and 0, respectively.

(3) Prior accident year development, including development on catastrophes, for the three months ended June 30, 2011 and 2010 decreased our Specialty Insurance Operations loss and LAE and total combined ratios by 2.8 points and 3.5 points, respectively. Prior accident year development, including development on catastrophes, for the six months ended June 30, 2011 and 2010 decreased our Specialty Insurance Operations loss and LAE and total combined ratios by 1.7 points and 2.3 points, respectively.

Specialty Insurance Operations—Three months ended June 30, 2011 versus three months ended June 30, 2010

Overview. We reported a GAAP combined ratio of 95.0% for the three months ended June 30, 2011, essentially unchanged as compared to 94.7% for the three months ended June 30, 2010, with increases in the expense ratio almost entirely offset by decreases in the loss and LAE ratio. The slight increase in our combined ratio reflects higher other underwriting expenses and current accident year catastrophe losses primarily related to tornado activity in the southeastern United States in April, as well as lower favorable loss reserve development, essentially offset by lower current accident year non-catastrophe losses as the prior year period included significant large loss activity mainly related to OneBeacon Property and Inland Marine (PIM).

MGA Business. Net written premiums for MGA Business increased by 4.7% to $71.7 million in the three months ended June 30, 2011 from $68.5 million in the three months ended June 30, 2010. The increase compared to the prior year period was primarily due to a $4.4 million increase in net written premiums from our collector cars and boats business driven by growth in new business as well as retention, partially offset by a $0.8 million decrease in net written premiums from OneBeacon Entertainment (OBE) and a $0.4 million decrease in net written premiums from A.W.G. Dewar (Dewar).

The MGA Business combined ratio for the three months ended June 30, 2011 increased to 94.9% from 90.2% for the three months ended June 30, 2010. The loss and LAE ratio decreased by 1.2 points to 53.3%, while the expense ratio increased by 5.9 points to 41.6%. The increase in the loss and LAE ratio reflects a 3.1 point decrease in current accident year losses, partially offset by a 1.9 point change in loss reserve development as compared to the prior year period. Current accident year non-catastrophe losses were 3.2 points lower than the prior year period as the three months ended June 30, 2010 included the impact of several large losses at OBE. The three months ended June 30, 2011 includes 2.0 points of current accident year catastrophe losses, primarily related to tornados in the southeastern and midwestern United States which impacted our collector cars and boats business, as compared to 1.9 points, primarily related to severe wind and rainstorms in the northeastern and southeastern United States which impacted our collector cars and boats business, in the three months ended June 30, 2010. The three months ended June 30, 2011 included 1.0 point of adverse loss reserve development, compared to 0.9 points of favorable loss reserve development primarily related to OBE. The increase in the expense ratio was driven by higher other underwriting expenses and higher policy acquisition expenses related to compensation.

Specialty Industries. Net written premiums for Specialty Industries increased by 19.0% to $102.9 million in the three months ended June 30, 2011 from $86.5 million in the three months ended June 30, 2010. The increase compared to the prior year period was due to a $12.2 million increase in net written premiums from OneBeacon Accident Group (OBA), a $2.3 million increase in net written premiums from OneBeacon Energy Group (OBEG), a $1.8 million increase in net written premiums from OneBeacon Technology Insurance (OBTI) and a $0.9 million increase in net written premiums from OneBeacon Government Risks (OBGR), partially offset by a $0.8 million decrease in net written premiums from International Marine Underwriters (IMU). The increase was primarily due to new business at OBA as well as solid retention levels despite competition in the marketplace.

The Specialty Industries combined ratio for the three months ended June 30, 2011 decreased to 91.3% from 93.1% for the three months ended June 30, 2010. The loss and LAE ratio decreased by 1.8 points to 50.9% while the expense ratio remained flat at 40.4%. The decrease in the loss and LAE ratio was due to the impact of favorable loss reserve development. The three months ended June 30, 2011 included 4.1 points of favorable loss reserve development primarily related to OBTI and IMU, compared to no loss reserve development in the prior year period. The impact of the favorable loss reserve development was partially offset by a 2.3 point increase in current accident year losses, compared with the three months ended June 30, 2010. The three months ended June 30, 2011 included 2.7 points of current accident year catastrophe losses, primarily related to tornados in the southeastern and midwestern United States which impacted OBTI and OBGR, as compared to 2.6 points of current accident year catastrophe losses, primarily

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related to severe wind and rainstorms in a number of states. Within the expense ratio, a slight increase in other underwriting expenses was offset by a decrease in policy acquisition expenses.

Specialty Products. Net written premiums for Specialty Products increased by 10.4% to $91.4 million in the three months ended June 30, 2011 from $82.8 million in the three months ended June 30, 2010. The increase was primarily due to a $6.7 million increase in net written premiums from OneBeacon Professional Insurance (OBPI) primarily related to new business within the professional liability line and solid retention levels, a $1.2 million increase in net written premiums from OneBeacon Specialty Property (OBSP) and $0.8 million in net written premiums from OneBeacon Excess and Surplus (OBES) which we began writing in 2011. Net written premiums at PIM were essentially flat as compared to the prior year period, reflecting a revised underwriting strategy.

The Specialty Products combined ratio for the three months ended June 30, 2011 decreased to 98.3% from 99.3% for the three months ended June 30, 2010. The loss and LAE ratio decreased by 4.2 points to 63.2% while the expense ratio increased by 3.2 points to 35.1%. The decrease in the loss and LAE ratio was primarily due to a 7.4 point decrease in current accident year losses, compared with the three months ended June 30, 2010. Current accident year non-catastrophe losses decreased 10.9 points. The three months ended June 30, 2010 included the impact of a number of large losses experienced at PIM. The decrease in current accident year losses was partially offset by current accident year catastrophe losses and less favorable loss reserve development. The three months ended June 30, 2011 included 10.3 points of current accident year catastrophe losses, primarily related to tornados in the southeastern and midwestern United States impacting PIM and OBPI, compared to 6.8 points of current accident year catastrophe losses, primarily related to severe wind and rainstorms in a number of states at PIM. Further, the three months ended June 30, 2011 included 4.5 points of favorable loss reserve development primarily related to professional liability, compared to 7.7 points of favorable loss reserve development related to professional liability in the prior year period. The increase in the expense ratio was primarily due to an increase in other underwriting expenses, as well as a slight increase in policy acquisition expenses.

Reinsurance protection. We purchase reinsurance in order to minimize loss from large risks or catastrophic events. We also purchase individual property reinsurance coverage for certain risks to reduce large loss volatility through property-per-risk excess of loss reinsurance programs and individual risk facultative reinsurance. We also maintain excess of loss casualty reinsurance programs that provide protection for individual risk or catastrophe losses involving workers compensation, general liability, automobile liability, professional liability or umbrella liability. The availability and cost of reinsurance protection is subject to market conditions, which are outside of our control. Limiting our risk of loss through reinsurance arrangements serves to mitigate the impact of large losses; however, the cost of this protection in an individual period may exceed the benefit.

For the three months ended June 30, 2011, our net combined ratio was higher than our gross combined ratio by 4.1 points, primarily due to the impact of the cost of property reinsurance and catastrophe reinsurance, and to a lesser extent the cost of facultative reinsurance and marine reinsurance. For the three months ended June 30, 2010, our net combined ratio was higher than our gross combined ratio by 3.4 points, primarily due to the cost of property reinsurance and catastrophe reinsurance, and to a lesser extent the cost of facultative reinsurance.

Specialty Insurance Operations—Six months ended June 30, 2011 versus six months ended June 30, 2010

Overview. We reported a GAAP combined ratio of 94.7% for the six months ended June 30, 2011, compared to 95.3% for the six months ended June 30, 2010, with decreases in the loss and LAE ratio partially offset by increases in the expense ratio. The decrease in our combined ratio was primarily due to lower current accident year non-catastrophe losses, as the prior year period included significant large loss activity mainly related to PIM. Current accident year catastrophe losses were unchanged from the prior year period. The decrease was partially offset by lower favorable loss reserve development and higher other underwriting expenses.

MGA Business. Net written premiums for MGA Business increased by 4.3% to $120.2 million in the six months ended June 30, 2011 from $115.2 million in the six months ended June 30, 2010. The increase compared to the prior year period was primarily due to a $6.5 million increase in net written premiums from our collector cars and boats business driven by growth in new business as well as retention, and a $0.3 million increase in net written premiums from Dewar, partially offset by a $1.8 million decrease in net written premiums from OBE.

The MGA Business combined ratio for the six months ended June 30, 2011 increased to 91.2% from 88.9% for the six months ended June 30, 2010. The loss and LAE ratio decreased by 1.9 points to 49.4%, while the expense ratio increased by 4.2 points to 41.8%. The decrease in the loss and LAE ratio reflects a decrease in current accident year catastrophe and non-catastrophe losses as compared with the prior year period. The six months ended June 30, 2011 includes 1.3 points of current accident year catastrophe losses, primarily related to tornados in the southeastern and midwestern United States which impacted our collector cars and boats business, as compared to 2.5 points, primarily related to severe wind and rainstorms in the northeastern and southeastern United States which impacted our collector cars and boats business, in the six months ended June 30, 2010. Additionally, current accident year non-

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catastrophe losses were 2.6 points lower than the prior year period as the six months ended June 30, 2010 included the impact of several large losses at OBE. The decrease was partially offset by a 1.9 point increase in adverse loss reserve development. The six months ended June 30, 2011 included 3.7 points of adverse loss reserve development, compared to 1.8 points of adverse loss reserve development primarily related to OBE for both periods. The increase in the expense ratio was driven by higher other underwriting expenses, as well as higher policy acquisition expenses related to compensation.

Specialty Industries. Net written premiums for Specialty Industries increased by 14.9% to $188.5 million in the six months ended June 30, 2011 from $164.1 million in the six months ended June 30, 2010. The increase compared to the prior year period was due to a $13.3 million increase in net written premiums from OBA, a $5.9 million increase in net written premiums from OBGR, a $4.6 million increase in net written premiums from OBTI and a $3.9 million increase in net written premiums from OBEG. The increase was primarily due to new business at OBA as well as solid retention levels despite competition in the marketplace. These increases were partially offset by a $3.3 million decrease in net written premiums from IMU which reflects the competitive marketplace.

The Specialty Industries combined ratio for the six months ended June 30, 2011 decreased to 95.3% from 96.6% for the six months ended June 30, 2010. The loss and LAE ratio decreased by 1.9 points to 53.9% while the expense ratio increased by 0.6 points to 41.4%. The decrease in the loss and LAE ratio was primarily due to the impact of favorable loss reserve development. The six months ended June 30, 2011 included 4.1 points of favorable loss reserve development primarily related to OBTI, as well as IMU and OBGR, compared to 0.6 points of adverse loss reserve development primarily related to OBTI in the prior year period. This was partially offset by a 2.8 point increase in current accident year losses, compared with the six months ended June 30, 2010. The six months ended June 30, 2011 included 4.2 points of current accident year catastrophe losses, primarily related to storms and freezing weather in the northeastern and southwestern United States impacting IMU and tornados in the southeastern and midwestern United States impacting OBTI as well as OBGR and IMU, as compared to 2.7 points of current accident year catastrophe losses, primarily related to severe wind and rainstorms in the northeastern United States impacting IMU. The increase in the expense ratio was due to an increase in other underwriting expenses, partially offset by a small decrease in policy acquisition expenses.

Specialty Products. Net written premiums for Specialty Products decreased by 1.5% to $215.6 million in the six months ended June 30, 2011 from $218.8 million in the six months ended June 30, 2010. The decrease was primarily due to a $5.1 million decrease in net written premiums from PIM, reflecting a revised underwriting strategy, and a $1.0 million decrease in net written premiums from OBPI primarily related to the medical excess line, partially offset by a $1.9 million increase in net written premiums from OBSP and $1.0 million in net written premiums from OBES which we began writing in 2011.

The Specialty Products combined ratio for the six months ended June 30, 2011 decreased to 96.6% from 98.6% for the six months ended June 30, 2010. The loss and LAE ratio decreased by 4.0 points to 61.4% while the expense ratio increased by 2.0 points to 35.2%. The decrease in the loss and LAE ratio was primarily due to a 7.6 point decrease in current accident year losses, compared with the six months ended June 30, 2010. Current accident year non-catastrophe losses decreased 7.4 points. The six months ended June 30, 2010 included the impact of a number of large losses experienced at PIM. The six months ended June 30, 2011 included 6.4 points of current accident year catastrophe losses, primarily related to tornados in the southeastern and midwestern United States as well as storms and freezing weather in the northeastern and southwestern United States impacting PIM and to a lesser extent within the financial services business of OBPI, compared to 6.6 points of current accident year catastrophe losses, primarily related to severe wind and rainstorms in the northeastern United States experienced in the first quarter and elsewhere in the United States in the second quarter. The decrease in current accident year losses was partially offset by less favorable loss reserve development. The six months ended June 30, 2011 included 3.6 points of favorable loss reserve development primarily related to professional liability, compared to 7.2 points of favorable loss reserve development related to professional liability in the prior year period. The increase in the expense ratio was primarily due to an increase in other underwriting expenses, partially offset by a slight decrease in policy acquisition expenses.

Reinsurance protection. For the six months ended June 30, 2011, our net combined ratio was higher than our gross combined ratio by 4.5 points, primarily due to the impact of the cost of property reinsurance and facultative reinsurance, and also the cost of catastrophe reinsurance and marine reinsurance. For the six months ended June 30, 2010, our net combined ratio was higher than our gross combined ratio by 2.9 points, primarily due to the cost of facultative reinsurance and catastrophe reinsurance.

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Other Insurance Operations

Financial results for our Other Insurance Operations segment for the three and six months ended June 30, 2011 and 2010 are as follows:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Net written premiums	$	14.6		$	106.1		$	34.4		$	217.3
Earned premiums	$	18.1		$	187.1		$	39.7		$	404.4
Loss and LAE	(12.8		)	(118.8		)	(24.8		)	(316.0		)
Policy acquisition expenses	(1.9		)	(40.4		)	(3.7		)	(89.6		)
Other underwriting expenses	(5.5		)	(23.7		)	(11.5		)	(56.8		)
Total underwriting (loss) income	(2.1		)	4.2			(0.3		)	(58.0		)
Net other revenues	0.6			—			1.5			—
General and administrative expenses	—			(0.2		)	—			(0.7		)
Pre-tax (loss) income	$	(1.5	)	$	4.0		$	1.2		$	(58.7	)

As Other Insurance Operations consists primarily of business in run-off, GAAP ratios are not meaningful for the 2011 periods. The following table provides underwriting ratios for Other Insurance Operations for the three and six months ended June 30, 2010:

	Three months ended		Six months ended
	June 30, 2010
Ratios: (1)(2)(3)
Loss and LAE	63.5	%	78.1	%
Expense	34.2		36.2
Total GAAP combined	97.7	%	114.3	%

(1) Includes our long-term incentive compensation expense. For the three months ended June 30, 2010, long-term incentive compensation expense increased our Other Insurance Operations combined ratio by 0.5 points. For the six months ended June 30, 2010, long-term incentive compensation expense increased our Other Insurance Operations combined ratio by 1.7 points.

(2) Includes loss and LAE relating to catastrophes. For the three months ended June 30, 2010, total calendar year incurred loss and LAE relating to catastrophes increased our Other Insurance Operations loss and LAE and total combined ratios by 0.2 points, including development on prior accident year catastrophes which increased our Other Insurance Operations loss and LAE and total combined ratios by 0.3 points. For the six months ended June 30, 2010, total calendar year incurred loss and LAE relating to catastrophes increased our Other Insurance Operations loss and LAE and total combined ratios by 8.2 points, including development on prior accident year catastrophes which decreased our Other Insurance Operations loss and LAE and total combined ratios by 0.1 points.

(3) Prior accident year development, including development on catastrophes, for the three months ended June 30, 2010 decreased our Other Insurance Operations loss and LAE and total combined ratios by 5.2 points. Prior accident year development, including development on catastrophes, for the six months ended June 30, 2010 decreased our Other Insurance Operations loss and LAE and total combined ratios by 3.3 points

Other Insurance Operations—Three months ended June 30, 2011 versus three months ended June 30, 2010

Net written premiums for Other Insurance Operations decreased by 86.2% to $14.6 million in the three months ended June 30, 2011 from $106.1 million in the three months ended June 30, 2010, primarily due to the Personal Lines Transaction which closed in July 2010. The three months ended June 30, 2010 included $87.6 million of net written premiums related to the exited businesses. Further, net written premiums at AutoOne decreased by 18.9% to $15.0 million primarily due to actions taken to reduce our exposure in the voluntary private passenger automobile market.

Other Insurance Operations generated an underwriting loss of $2.1 million in the three months ended June 30, 2011, compared to underwriting income of $4.2 million in the three months ended June 30, 2010. Underwriting results from AutoOne were essentially unchanged from that for the prior year period. Underwriting results for the three months ended June 30, 2010 benefited from favorable loss reserve development, mainly due to lower than expected severity in commercial package business, the impact of

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which was partially offset by higher-than-average levels of large losses in the non-specialty commercial businesses and in the automobile line.

Other Insurance Operations—Six months ended June 30, 2011 versus six months ended June 30, 2010

Net written premiums for Other Insurance Operations decreased by 84.2% to $34.4 million in the six months ended June 30, 2011 from $217.3 million in the six months ended June 30, 2010, primarily due to the Personal Lines Transaction which closed in July 2010. The six months ended June 30, 2010 included $176.0 million of net written premiums related to the exited businesses. Further, net written premiums at AutoOne decreased by 19.4% to $33.3 million primarily due to actions taken to reduce our exposure in the voluntary private passenger automobile market.

Other Insurance Operations generated an underwriting loss of $0.3 million in the six months ended June 30, 2011, compared to $58.0 million in the six months ended June 30, 2010. The decrease in underwriting loss as compared to the prior year period reflects the impact of exiting businesses as a result of completing the Personal Lines Transaction and the Commercial Lines Transaction. The six months ended June 30, 2010 included significant catastrophe activity, primarily related to severe wind and rainstorms in the northeastern United States, and higher-than-average levels of large losses in the non-specialty commercial businesses and in the automobile line. Underwriting results from AutoOne were essentially unchanged from that for the prior year period.

Investing, Financing and Corporate Operations

A summary of results from our Investing, Financing and Corporate Operations segment for the three and six months ended June 30, 2011 and 2010 is as follows:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Net investment income	$	18.7		$	25.0		$	39.7		$	53.3
Net realized and unrealized investment gains (losses)	11.0			(14.4		)	34.1			28.0
Net other expenses	(12.2		)	(10.6		)	(12.4		)	(11.6		)
General and administrative expenses	(2.2		)	(2.3		)	(4.0		)	(5.8		)
Interest expense	(6.0		)	(7.9		)	(12.3		)	(17.0		)
Pre-tax income (loss)	$	9.3		$	(10.2	)	$	45.1		$	46.9

Investing, Financing and Corporate Operations— Three months ended June 30, 2011 versus three months ended June 30, 2010

Investing, Financing and Corporate Operations reported pre-tax income of $9.3 million in the three months ended June 30, 2011, compared to a pre-tax loss of $10.2 million in the three months ended June 30, 2010. The increase was primarily due to an increase in net realized and unrealized investment gains (losses), partially offset by a decrease in net investment income. Net realized and unrealized investment gains (losses) increased to $11.0 million in the three months ended June 30, 2011, compared to $(14.4) million in the prior year period, while net investment income decreased to $18.7 million in the three months ended June 30, 2011, compared to $25.0 million in the prior year period. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Summary of Investment Results”. The decrease in interest expense reflects actions taken to reduce outstanding debt. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Financing”. Net other expenses increased due to a $12.0 million loss related to the purchase of a portion of our senior notes in the three months ended June 30, 2011, compared to a $10.3 million loss related to the purchase of a portion of our senior notes in the three months ended June 30, 2010.

Investing, Financing and Corporate Operations— Six months ended June 30, 2011 versus six months ended June 30, 2010

Investing, Financing and Corporate Operations reported pre-tax income of $45.1 million in the six months ended June 30, 2011, compared to pre-tax income of $46.9 million in the six months ended June 30, 2010. The decrease was primarily related to a decrease in net investment income and an increase in net other expenses. Net investment income decreased to $39.7 million in the six months ended June 30, 2011, compared to $53.3 million in the prior year period. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Summary of Investment Results”. Net other expenses increased due to a $12.0 million loss related to the purchase of a portion of our senior notes in the six months ended June 30, 2011, compared to a $10.8 million loss related to the purchase of a portion of our senior notes in the six months ended June 30, 2010. These were partially offset by an increase in net realized and unrealized investment gains and a decrease in interest expense. Net realized and unrealized investment

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gains increased to $34.1 million in the six months ended June 30, 2011, compared to $28.0 million in the prior year period. The decrease in interest expense reflects actions taken to reduce outstanding debt. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Financing”.

Summary of Investment Results

Investment Philosophy

Our long-term investment philosophy has historically been to maximize our after tax risk-adjusted return while taking prudent levels of risk and maintaining a diversified portfolio. Under this approach, each dollar of after-tax investment income and realized and unrealized gains and losses is valued equally.

Our investment portfolio mix as of June 30, 2011 consisted in large part of high quality, fixed maturity investments and short-term investments, as well as a smaller allocation to equity investments which are comprised of common equity securities, convertible bonds and other investments such as hedge funds and private equity funds. Our management believes that prudent levels of investments in common equity securities, convertible bonds and other investments within our investment portfolio are likely to enhance long-term after tax total returns without significantly increasing the risk profile of the portfolio.

Our overall fixed maturity investment strategy is to purchase securities that are attractively priced in relation to their investment risks. We also generally manage the interest rate risk associated with holding fixed maturity investments by actively maintaining the average duration of the portfolio to achieve an adequate after tax total return without subjecting the portfolio to an unreasonable level of interest rate risk.

Our equity investment strategy is to maximize absolute risk-adjusted return through investments in a variety of common equity, equity-related and convertible bond instruments as well as other investments, primarily hedge funds and private equity funds. We invest in relatively concentrated positions in the United States and other developed markets. Our philosophy is to invest for risk-adjusted return using a bottom-up, value investing approach. Preservation of capital is of the utmost importance.

Investment Returns

A summary of our consolidated pre-tax investment results for the three and six months ended June 30, 2011 and 2010 is as follows:

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
	($ in millions)
Net investment income	$	18.7		$	25.0		$	39.7		$	53.3
Net realized investment gains	16.9			12.8			34.9			39.2
Change in net unrealized investment gains and losses	(5.9		)	(27.2		)	(0.8		)	(11.2		)
Total GAAP pre-tax investment results	$	29.7		$	10.6		$	73.8		$	81.3

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Gross investment returns versus typical benchmarks for the three and six months ended June 30, 2011 and 2010 are as follows:

	Three months ended June 30, (1)				Six months ended June 30, (1)
	2011		2010		2011		2010
Fixed maturity investments	1.4	%	1.2	%	2.5	%	3.2	%
Short-term investments	0.1		0.0		0.1		0.0
Total fixed income	1.3		0.8		2.2		2.4
Barclays U.S. Intermediate Aggregate Index	2.2		2.9		2.7		4.8
Common equity securities	(1.0	)	(3.9	)	3.1		(0.5	)
Convertible bonds	(2.4	)	(1.8	)	0.0		3.2
Total common equity securities and convertible bonds	(1.3	)	(3.1	)	2.4		1.0
Other investments	2.3		(1.6	)	6.2		0.9
Total common equity securities, convertible bonds and other investments	(0.3	)	(2.6	)	3.5		1.0
S&P 500 Index (total return)	0.1		(11.4	)	6.0		(6.7	)
Total consolidated portfolio	1.0	%	0.3	%	2.5	%	2.2	%

(1) Gross investment income returns exclude investment expenses of $1.8 million and $2.4 million, respectively, for the three months ended June 30, 2011 and 2010, and $3.6 million and $4.7 million, respectively, for the six months ended June 30, 2011 and 2010.

Investment Returns—Three months ended June 30, 2011 versus three months ended June 30, 2010

Overview

Our total pre-tax investment results were $29.7 million, a return of 1.0% for the three months ended June 30, 2011, compared to $10.6 million, a return of 0.3% for the three months ended June 30, 2010. Net investment income in the three months ended June 30, 2011 was $18.7 million, a decrease of $6.3 million, compared to $25.0 million in the three months ended June 30, 2010. The decrease was primarily due to a reduction in invested assets to $2,887.5 million as of June 30, 2011 as a result of the Personal Lines Transaction, return of capital to shareholders and repurchases of debt, from $3,788.3 million as of June 30, 2010, prior to the reclassification of assets being sold as part of the Personal Lines Transaction. Net realized investment gains were $16.9 million in the three months ended June 30, 2011, an increase of $4.1 million compared to $12.8 million in the three months ended June 30, 2010. The change in net unrealized investment gains and losses was a decrease of $5.9 million in the three months ended June 30, 2011, compared to a decrease of $27.2 million in the three months ended June 30, 2010.

Fixed income

Our fixed income portfolio, which includes fixed maturity and short-term investments, returned 1.3% for the three months ended June 30, 2011, compared to 0.8% for the three months ended June 30, 2010. We maintained a high quality fixed maturity portfolio with a relatively short duration of approximately 2.6 years excluding short-term investments and approximately 2.5 years including short-term investments at June 30, 2011. Our fixed income portfolio performed consistently with its characteristics and below the Barclays U.S. Intermediate Aggregate Index benchmark for the three months ended June 30, 2011 and 2010.

Common equity securities, convertible bonds and other investments

Our total common equity securities, convertible bonds and other investments portfolio returned (0.3)% for the three months ended June 30, 2011, compared to (2.6)% for the three months ended June 30, 2010. Our total common equity securities and convertible bonds portfolio returned (1.3)% and (3.1)% for the three months ended June 30, 2011 and 2010, respectively, or 140 basis points worse and 830 basis points better, respectively, than the Standard & Poor’s 500 Index (S&P 500) benchmark. Our other investments portfolio returned 2.3% for the three months ended June 30, 2011, compared to (1.6)% for the three months ended June 30, 2010.

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Investment Returns—Six months ended June 30, 2011 versus six months ended June 30, 2010

Overview

Our total pre-tax investment results were $73.8 million, a return of 2.5% for the six months ended June 30, 2011, compared to $81.3 million, a return of 2.2% for the six months ended June 30, 2010. Net investment income in the six months ended June 30, 2011 was $39.7 million, a decrease of $13.6 million, compared to $53.3 million in the six months ended June 30, 2010. The decrease was primarily due to a reduction in invested assets to $2,887.5 million as of June 30, 2011 as a result of the Personal Lines Transaction, return of capital to shareholders and repurchases of debt, from $3,788.3 million as of June 30, 2010, prior to the reclassification of assets being sold as part of the Personal Lines Transaction. Net realized investment gains were $34.9 million in the six months ended June 30, 2011, a decrease of $4.3 million compared to $39.2 million in the six months ended June 30, 2010. The change in net unrealized investment gains and losses was a decrease of $0.8 million in the six months ended June 30, 2011, compared to a decrease of $11.2 million in the six months ended June 30, 2010.

Fixed income

Our fixed income portfolio, which includes fixed maturity and short-term investments, returned 2.2% for the six months ended June 30, 2011, compared to 2.4% for the six months ended June 30, 2010. We maintained a high quality fixed maturity portfolio with a relatively short duration of approximately 2.6 years excluding short-term investments and approximately 2.5 years including short-term investments at June 30, 2011. Our fixed income portfolio performed consistently with its characteristics and slightly below the Barclays U.S. Intermediate Aggregate Index benchmark for the six months ended June 30, 2011 and 2010.

Common equity securities, convertible bonds and other investments

Our total common equity securities, convertible bonds and other investments portfolio returned 3.5% for the six months ended June 30, 2011, compared to 1.0% for the six months ended June 30, 2010. Our total common equity securities and convertible bonds portfolio returned 2.4% and 1.0% for the six months ended June 30, 2011 and 2010, respectively, or 360 basis points worse and 770 basis points better, respectively, than the S&P 500 benchmark. Our other investments portfolio returned 6.2% for the six months ended June 30, 2011, compared to 0.9% for the six months ended June 30, 2010.

Fair Value Considerations

We record our investments in accordance with ASC 820 which provides a revised definition of fair value, establishes a framework for measuring fair value and expands financial statement disclosure requirements for fair value information. Under ASC 820, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants (an exit price). ASC 820 establishes a fair value hierarchy that distinguishes between inputs based on market data from independent sources (observable inputs) and a reporting entity’s internal assumptions based upon the best information available when external market data is limited or unavailable (unobservable inputs). The fair value hierarchy in ASC 820 prioritizes fair value measurements into three levels based on the nature of the inputs. Quoted prices in active markets for identical assets or liabilities have the highest priority (Level 1), followed by observable inputs other than quoted prices, including prices for similar but not identical assets or liabilities (Level 2), and unobservable inputs, including the reporting entity’s estimates of the assumptions that market participants would use, having the lowest priority (Level 3).

We use brokers and outside pricing services to assist in determining fair values. For investments in active markets, we use the quoted market prices provided by the outside pricing services to determine fair value. The outside pricing services we use have indicated that they will only provide prices where observable inputs are available. In circumstances where quoted market prices are unavailable, we utilize fair value estimates based upon other observable inputs including matrix pricing, benchmark interest rates, market comparables and other relevant inputs. In circumstances where observable inputs are adjusted to reflect management’s best estimate of fair value, such fair value measurements are considered a lower level measurement in the fair value hierarchy.

Our process to validate the market prices obtained from the outside pricing sources includes, but is not limited to, periodic evaluation of model pricing methodologies and analytical reviews of certain prices. We also periodically perform back-testing of selected purchases and sales activity to determine whether there are any significant differences between the market price used to value the security prior to the purchase or sale and the actual purchase or sale price.

Other investments, which are comprised primarily of hedge funds and private equity funds for which the fair value option has been elected, are carried at fair value based upon our proportionate interest in the underlying fund’s net asset value, which is deemed to approximate fair value. The fair value of our investments in hedge funds and private equity funds has been estimated using net asset value because it reflects the fair value of the funds’ underlying investments in accordance with ASC 820. We employ a number of procedures to assess the reasonableness of the fair value measurements, including obtaining and reviewing each fund’s audited

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financial statements and discussing each fund’s pricing with the fund’s manager. However, since the fund managers do not provide sufficient information to independently evaluate the pricing inputs and methods for each underlying investment, the inputs are considered to be unobservable. Accordingly, the fair values of our investment in hedge funds and private equity funds have been classified as Level 3 under the fair value hierarchy.

In circumstances where the underlying investments are publicly traded, such as the investments made by hedge funds, the fair value of the underlying investments is determined using current market prices. In circumstances where the underlying investments are not publicly traded, such as the investments made by private equity funds, the private equity fund managers have considered the need for a liquidity discount on each of the underlying investments when determining the fund’s net asset value in accordance with ASC 820. In circumstances where our portion of a fund’s net asset value is deemed to differ from fair value due to illiquidity or other factors associated with our investment in the fund, including counterparty credit risk, the net asset value is adjusted accordingly. At June 30, 2011 and December 31, 2010, we did not record an adjustment to the net asset value related to our investments in hedge funds or private equity funds.

As of both June 30, 2011 and December 31, 2010, other investments reported at fair value represented approximately 5% of the investment portfolio recorded at fair value. Other investments accounted for at fair value as of June 30, 2011 and December 31, 2010 were comprised of $53.6 million and $63.4 million, respectively, in hedge funds, $68.9 million and $72.7 million, respectively, in private equity funds and $14.1 million for both periods of an investment in a community reinvestment vehicle. At June 30, 2011 and December 31, 2010, we held investments in 9 and 10 hedge funds, respectively, and 14 and 15 private equity funds, respectively. The largest investment in a single fund was $17.2 million and $24.6 million, respectively, at June 30, 2011 and December 31, 2010.

As of both June 30, 2011 and December 31, 2010, approximately 91% of the investment portfolio recorded at fair value was priced based upon observable inputs. Investments valued using Level 1 inputs include fixed maturities, primarily investments in U.S. Treasuries, common equities and short-term investments, which include U.S. Treasury Bills. Investments valued using Level 2 inputs comprise fixed maturities including corporate debt, state and other governmental debt, convertible fixed maturity securities and mortgage and asset-backed securities. Fair value estimates for investments that trade infrequently and have few or no observable market prices are classified as Level 3 measurements. Level 3 fair value estimates based upon unobservable inputs include our investments in hedge funds and private equity funds, as well as investments in debt and equity securities, including certain asset-backed securities, where quoted market prices are unavailable.

The fair value measurements at June 30, 2011 and December 31, 2010 for assets recorded in accordance with ASC 825 and any related Level 3 inputs are as follows:

	Fair value at June 30, 2011		Level 3 Inputs		Level 3 Percentage
	($ in millions)
Fixed maturity investments:
U.S. Government and agency obligations	$	222.1	$	—	—	%
Debt securities issued by corporations	822.7		—		—
Municipal obligations	2.0		—		—
Asset-backed securities	1,090.3		22.0		2.0
Foreign government obligations	8.4		—		—
Preferred stocks	83.0		70.3		84.7
Fixed maturity investments	2,228.5		92.3		4.1
Short-term investments	116.2		—		—
Common equity securities	304.7		42.5		13.9
Convertible bonds	79.8		—		—
Other investments(1)	136.6		136.6		100.0
Total(1)	$	2,865.8	$	271.4	9.5	%

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	Fair value at December 31, 2010		Level 3 Inputs		Level 3 Percentage
	($ in millions)
Fixed maturity investments:
U.S. Government and agency obligations	$	250.7	$	—	—	%
Debt securities issued by corporations	948.6		—		—
Municipal obligations	2.1		—		—
Asset-backed securities	1,117.4		27.7		2.5
Foreign government obligations	13.3		—		—
Preferred stocks	83.4		71.4		85.6
Fixed maturity investments	2,415.5		99.1		4.1
Short-term investments	300.0		—		—
Common equity securities	285.3		39.7		13.9
Convertible bonds	93.8		—		—
Other investments(1)	150.2		150.2		100.0
Total(1)	$	3,244.8	$	289.0	8.9	%

At June 30, 2011 and December 31, 2010, we held one private preferred stock that represented approximately 85% and 86%, respectively, of our preferred stock portfolio. We used quoted market prices for similar securities that were adjusted to reflect management’s best estimate of fair value; this security is classified as a Level 3 measurement.

In addition to the investment portfolio described above, we had $44.6 million and $41.3 million, respectively, of liabilities recorded at fair value and included in other liabilities as of June 30, 2011 and December 31, 2010. These liabilities relate to securities that have been sold short by a limited partnership in which we invest and are required to consolidate in accordance with GAAP. As of June 30, 2011, $44.5 million of these liabilities have been classified as Level 1 measurements and $0.1 million of these liabilities have been classified as Level 2 measurements. As of December 31, 2010, all of the liabilities included in the $41.3 million have been classified as Level 1 measurements.

The changes in Level 3 fair value measurements for the three and six months ended June 30, 2011 are as follows:

	Fixed maturity investments			Common equity securities			Convertible bonds		Other investments(1)			Total(1)
	($ in millions)
Balance at January 1, 2011	$	99.1		$	39.7		$	—	$	150.2		$	289.0
Amortization/accretion	—			—			—		—			—
Total net realized and unrealized gains (losses)	1.8			(1.3		)	—		6.4			6.9
Purchases	0.3			3.9			—		1.8			6.0
Sales	—			(0.1		)	—		(17.0		)	(17.1		)
Transfers in	—			—			—		—			—
Transfers out	(27.7		)	—			—		—			(27.7		)
Balance at March 31, 2011	$	73.5		$	42.2		$	—	$	141.4		$	257.1
Amortization/accretion	—			—			—		—			—
Total net realized and unrealized gains (losses)	(3.4		)	0.3			—		4.2			1.1
Purchases	22.2			—			—		0.8			23.0
Sales	—			—			—		(9.8		)	(9.8		)
Transfers in	—			—			—		—			—
Transfers out	—			—			—		—			—
Balance at June 30, 2011	$	92.3		$	42.5		$	—	$	136.6		$	271.4

(1) Excludes the carrying value of $21.7 million associated with a tax advantaged federal affordable housing development fund accounted for using the equity method.

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Liquidity and Capital Resources

Operating cash and short-term investments

Our sources and uses of cash are as follows:

Holding company level. The primary sources of cash for OneBeacon Insurance Group, Ltd. and certain of our intermediate holding companies are expected to be distributions and tax sharing payments received from our insurance operating subsidiaries, capital raising activities and net investment income and proceeds from sales and maturities of holding company investments. The primary uses of cash are expected to be common share repurchases, interest payments on our debt obligations, repurchases and retirements of our debt obligations, dividend payments on our common shares, purchases of investments, payments made to tax authorities, contributions to our operating subsidiaries, and holding company operating expenses.

Operating subsidiary level. The primary sources of cash for our operating subsidiaries are expected to be premium collections, net investment income, capital raising activities, contributions from our holding companies and proceeds from sales and maturities of investments. The primary uses of cash are expected to be claim payments, policy acquisition costs, interest payments on our debt obligations, repurchases and retirements of our debt obligations, operating expenses, purchases of investments, and distributions and tax sharing payments made to parent holding companies.

Insurance companies typically collect premiums on policies that they write prior to paying claims made under those policies. During periods of premium growth, insurance companies typically experience positive cash flow from operations, as premium receipts typically exceed claim payments. When this happens, positive cash flow from operations is usually offset by negative cash flow from investing activities, as the positive operating cash flow is used to purchase investments. Conversely, during periods of premium decline, insurance companies typically experience negative cash flow from operations, even during periods in which they report GAAP net income, as the claims that they pay exceed the premiums that they collect. When this happens, negative cash flow from operations is typically offset by positive cash flow from investing activities, as invested assets are sold to fund current claim payments.

Both internal and external forces influence our financial condition, results of operations and cash flows. Claim settlements, premium levels and investment returns may be impacted by changing rates of inflation and other economic conditions. In many cases, significant periods of time, ranging up to several years or more, may lapse between the occurrence of an insured loss, the reporting of the loss to us and the settlement of the liability for that loss. The exact timing of the payment of claims and benefits cannot be predicted with certainty. Our operating subsidiaries maintain portfolios of invested assets with varying maturities and a substantial amount of cash and short-term investments to provide adequate liquidity for the payment of claims.

Management believes that our cash balances, cash flows from operations and cash flows from investments are adequate to meet expected cash requirements for the foreseeable future on both a holding company and operating subsidiary level.

Dividend Capacity

Under the insurance laws of the states and jurisdictions under which our operating subsidiaries are domiciled, an insurer is restricted with respect to the timing or the amount of dividends it may pay without prior approval by regulatory authorities. Accordingly, there can be no assurance regarding the amount of such dividends that may be paid by such subsidiaries in the future.

Generally, our regulated insurance operating subsidiaries have the ability to pay dividends during any 12-month period without the prior approval of regulatory authorities in an amount set by formula based on the greater of prior year statutory net income or 10% of prior year end statutory surplus, subject to the availability of unassigned funds. Our top tier regulated insurance operating subsidiaries have the ability to pay $291 million of dividends during 2011 without the prior approval of regulatory authorities, subject to the availability of unassigned funds. At March 31, 2011, OneBeacon’s top tier regulated insurance operating subsidiaries had $0.7 billion of unassigned funds and at December 31, 2010, had statutory surplus of $1.1 billion. At June 30, 2011, we had approximately $248 million of net unrestricted cash, short-term investments and fixed maturity investments and approximately $13 million of common equity securities outside of our regulated insurance operating subsidiaries.

During the six months ended June 30, 2011, our top tier regulated operating subsidiaries distributed $150.0 million of extraordinary dividends to OneBeacon Insurance Group LLC (OneBeacon LLC). During the six months ended June 30, 2010, our top

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tier regulated operating subsidiaries distributed $311.0 million of dividends, including $71.0 million of ordinary dividends and $240.0 million of extraordinary dividends to OneBeacon LLC. During the six months ended June 30, 2011 and 2010, our unregulated operating subsidiaries paid $4.1 million and $8.1 million, respectively, of dividends to their immediate parent.

During the six months ended June 30, 2011, we paid cash dividends totaling $134.9 million, or $1.42 per common share, including $39.8 million, or $0.42 per common share, of regular quarterly cash dividends and $95.1 million, or $1.00 per common share, of a special dividend. During the six months ended June 30, 2010, we paid cash dividends totaling $39.9 million, or $0.42 per common share, of regular quarterly cash dividends.

Insurance Float

Insurance float is an important aspect of our insurance operations. Insurance float represents funds that an insurance company holds for a limited time. In an insurance operation, float arises because premiums are collected before losses are paid. This interval can extend over many years. During that time, the insurer invests the funds. When the premiums that an insurer collects do not cover the losses and expenses it eventually must pay, the result is an underwriting loss, which is considered to be the cost of insurance float. We calculate our insurance float by taking our net invested assets and subtracting our total capital. Although insurance float can be calculated using numbers determined under GAAP, insurance float is not a GAAP concept and, therefore, there is no comparable GAAP measure.

Insurance float can increase in a number of ways, including through acquisitions of insurance operations, organic growth in existing insurance operations and recognition of losses that do not cause a corresponding reduction in investment assets. Conversely, insurance float can decrease in a number of other ways, including sales of insurance operations, shrinking or run-off of existing insurance operations, the acquisition of operations that do not have substantial investment assets (e.g., an agency) and the recognition of gains that do not cause a corresponding increase in investment assets. We have historically obtained our insurance float through both acquisitions and organic growth. We intend to generate low-cost float over time through a combination of acquisitions and organic growth in our ongoing insurance operations. However, we will seek to increase our insurance float organically only when market conditions allow for an expectation of generating underwriting profits.

Certain operational leverage metrics can be measured with ratios that are calculated using insurance float. There are many activities that do not change the amount of insurance float at an insurance company but can have a significant impact on the company’s operational leverage metrics. For example, investment gains and losses, foreign currency gains and losses, debt issuances and repurchases/repayments, common share issuances and repurchases and dividends paid to shareholders are all activities that do not change insurance float but that can meaningfully impact operational leverage metrics.

The following table illustrates our consolidated insurance float position and four operational leverage ratios based on insurance float and net invested assets as of June 30, 2011 and December 31, 2010.

	June 30, 2011			December 31, 2010
	($ in millions)
Total investments	$	2,887.5		$	3,266.0
Cash	31.3			33.6
Accounts receivable on unsettled investment sales	7.3			5.4
Accounts payable on unsettled investment purchases	(23.6		)	(14.1		)
Net invested assets	$	2,902.5		$	3,290.9
OneBeacon’s common shareholders’ equity	$	1,152.3		$	1,229.0
Debt	269.7			419.6
Total capital	$	1,422.0		$	1,648.6
Insurance float	$	1,480.5		$	1,642.3
Insurance float as a multiple of total capital	1.0		x	1.0		x
Net invested assets as a multiple of total capital	2.0		x	2.0		x
Insurance float as a multiple of OneBeacon’s common shareholders’ equity	1.3		x	1.3		x
Net invested assets as a multiple of OneBeacon’s common shareholders’ equity	2.5		x	2.7		x

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Financing

The following table summarizes our capital structure at June 30, 2011 and December 31, 2010:

	June 30, 2011			December 31, 2010
	($ in millions)
Senior Notes, carrying value	$	269.7		$	419.6
OneBeacon’s common shareholders’ equity	1,152.3			1,229.0
Total capital	$	1,422.0		$	1,648.6
Ratio of debt to total capital	19.0		%	25.5		%

(1) See Note 6—“Debt” of the accompanying consolidated financial statements.

We believe that we have the flexibility and capacity to obtain funds externally as needed through debt or equity financing on both a short-term and long-term basis. However, we can provide no assurance that, if needed, we would be able to obtain additional debt or equity financing on satisfactory terms, if at all.

Senior Notes

On March 24, 2011, OBH commenced a cash tender offer for up to $150.0 million in aggregate principal amount of the 5.875% Senior Notes due 2013 of our subsidiary OBH, which we refer to as the Senior Notes, at a price of $1,045 per $1,000 principal amount. The cash tender offer, which was not subject to the tender of any minimum principal amount of Senior Notes, expired on April 20, 2011. Holders of Senior Notes who tendered on or before April 6, 2011 received an early tender payment of $30 for every $1,000 principal amount of Senior Notes validly tendered. Payment for the Senior Notes included accrued and unpaid interest up to the settlement date. On April 21, 2011, OBH accepted and retired $150.0 million aggregate principal amount of its Senior Notes for $161.6 million, which resulted in a $12.0 million pre-tax loss, including transaction fees.

On May 3, 2010, OBH commenced a cash tender offer for up to $200.0 million in aggregate principal amount of the Senior Notes at a price of $1,027.50 per $1,000 principal amount. The cash tender offer, which was not subject to the tender of any minimum principal amount of Senior Notes, expired on May 28, 2010. Holders of Senior Notes who tendered on or before May 14, 2010 received an early tender payment of $30 for every $1,000 principal amount of Senior Notes validly tendered. Payment for the Senior Notes included accrued and unpaid interest up to the settlement date. OBH accepted and retired $156.4 million aggregate principal amount of its Senior Notes, of which $155.2 million was tendered by the early tender deadline, for purchase for $165.4 million, which resulted in a $9.6 million pre-tax loss, including transaction fees.

During the second quarter of 2010, OBH repurchased and retired $18.2 million of outstanding Senior Notes for $18.9 million, which resulted in a $0.7 million loss. During the first quarter of 2010, OBH repurchased and retired $11.5 million of outstanding Senior Notes for $11.9 million, which resulted in a $0.5 million loss. During the first quarter of 2010, OneBeacon Insurance Company purchased $1.1 million of outstanding Senior Notes for $1.1 million.

White Mountains Insurance Group, Ltd. (White Mountains) currently provides an irrevocable and unconditional guarantee as to the payment of principal and interest on the Senior Notes. In consideration of this Guarantee, we have agreed to pay a specified fee to White Mountains in the amount of 25 basis points per annum on the outstanding principal amount of the Senior Notes. We have further agreed that if White Mountains’ voting interest in us ceases to represent more than 50% of all our voting securities, we will redeem, exchange or otherwise modify the Senior Notes in order to fully and permanently eliminate White Mountains’ obligations under the Guarantee (the Guarantee Elimination). White Mountains has agreed to provide written notice to us when its voting interest in us has been reduced below 50%. We will have 180 days from the receipt of such notification to complete the Guarantee Elimination. If the Guarantee Elimination is not completed within the initial 180-day period, the Guarantee fee shall increase by 200 basis points. The Guarantee fee shall further increase by 100 basis points for each subsequent 90-day period thereafter, up to a maximum Guarantee fee of 425 basis points, until the Guarantee Elimination has been completed.

The Senior Notes were issued under an indenture which contains restrictive covenants that, among other things, limit the ability of White Mountains, OBH and their respective subsidiaries, which includes us, as a subsidiary of White Mountains, to create liens and enter into sale and leaseback transactions and substantially limit the ability of OBH and its respective subsidiaries, which includes us, to consolidate, merge or transfer their properties and assets. The indenture does not contain any financial ratios or specified levels of net worth or liquidity to which White Mountains or OBH must adhere. At June 30, 2011, White Mountains and OBH were in compliance with all of the covenants under the Senior Notes.

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The indenture documents provide that, if White Mountains as guarantor of the Senior Notes has a payment default in excess of $25 million under a credit agreement, mortgage or similar debt agreement, there is a default under the Senior Notes. White Mountains has a revolving credit facility which provides for borrowing up to a maximum of $475 million and which contains restrictive financial covenants. Therefore, if White Mountains were to breach its financial covenants in its revolving credit facility, an event of default would result, which would allow lenders to declare all amounts owed under the credit facility to be immediately due and payable. A failure to pay the amount owed under the credit facility would permit the trustees or holders of 25% or more of the Senior Notes to declare an event of default under the indenture documents resulting in a required repayment of the Senior Notes. At June 30, 2011, the facility was undrawn. At June 30, 2011, White Mountains was in compliance with all of the covenants under the facility. See “Note 16. Related Party Disclosures” of the Company’s 2010 Annual Report on Form 10-K.

Share Repurchase Program

On August 22, 2007, our Board authorized us to repurchase up to $200.0 million of OneBeacon’s Class A common shares from time to time, subject to market conditions. Shares may be repurchased on the open market or through privately negotiated transactions. This program does not have a stated expiration date. During the three months ended June 30, 2011, no shares were repurchased. During the three months ended June 30, 2010, 0.4 million Class A common shares were repurchased for $5.9 million and retired, at an average price per share of $14.43.

Cash Flows

Detailed information concerning our cash flows for the six months ended June 30, 2011 and 2010 follows:

Cash flows from operations for the six months ended June 30, 2011 and 2010

Net cash flows used for operations were $117.4 million and $53.7 million, respectively, for the six months ended June 30, 2011 and 2010. Net cash flows for operations in the first six months of 2011 and 2010 were adversely impacted by the run-off of reserves related to the Commercial Lines Transaction.

Cash flows from investing and financing activities for the six months ended June 30, 2011

Financing and Other Capital Activities

During the first six months of 2011, we declared and paid $39.8 million of regular quarterly cash dividends and $95.1 million of a special dividend to holders of OneBeacon’s common shares.

During the first six months of 2011, we paid $10.6 million of interest on our debt obligations, all of it on the Senior Notes.

During the second quarter of 2011, OBH repurchased and retired a portion of the Senior Notes for $161.6 million in a cash tender offer, including transaction fees.

Other Liquidity and Capital Resource Activities

During the first quarter of 2011, we made payments with respect to our long-term incentive compensation plans totaling $16.8 million, in cash or by deferral into certain of our non-qualified compensation plans. These payments were made primarily with respect to 929,849 performance shares for the 2008-2010 performance cycle.

Cash flows from investing and financing activities for the six months ended June 30, 2010

Financing and Other Capital Activities

During the first six months of 2010, we declared and paid $39.9 million of regular quarterly cash dividends to holders of OneBeacon’s common shares.

During the first six months of 2010, we repurchased and retired 0.4 million of our Class A common shares for $5.9 million through our share repurchase program.

During the first six months of 2010, we paid $18.1 million of interest on our debt obligations, including $17.8 million of interest on the Senior Notes.

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During the first six months of 2010, OBIC purchased a portion of the Senior Notes for $1.1 million.

During the first six months of 2010, OBH repurchased and retired a portion of the Senior Notes for $30.8 million.

During the second quarter of 2010, OBH repurchased and retired a portion of the Senior Notes for $165.4 million in a cash tender offer, including transaction fees.

During the first quarter of 2010, we repaid the $14.0 million outstanding balance on the note issued in connection with the acquisition of the Atlantic Specialty Insurance Company

Other Liquidity and Capital Resource Activities

During the first quarter of 2010, we made payments with respect to our long-term incentive compensation plans totaling $21.4 million, in cash or by deferral into certain of our non-qualified compensation plans. These payments were made primarily with respect to 682,344 performance shares for the 2007-2009 performance cycle.

Critical Accounting Estimates

Refer to the Company’s 2010 Annual Report on Form 10-K for a complete discussion regarding our critical accounting estimates. As of June 30, 2011, there were no material changes to our critical accounting estimates.

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FORWARD-LOOKING STATEMENTS

The information contained in this report may contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements, other than statements of historical facts, included or referenced in this report that address activities, events or developments which we expect or anticipate will or may occur in the future are forward-looking statements. The words “will,” “believe,” “intend,” “expect,” “anticipate,” “project,” “estimate,” “predict” and similar expressions are also intended to identify forward-looking statements. These forward-looking statements include, among others, statements with respect to our:

· change in book value per share or return on equity;

· business strategy;

· financial and operating targets or plans;

· incurred loss and loss adjustment expenses and the adequacy of our loss and loss adjustment expense reserves and related reinsurance;

· projections of revenues, income (or loss), earnings (or loss) per share, dividends, market share or other financial forecasts;

· expansion and growth of our business and operations; and

· future capital expenditures.

These statements are based on certain assumptions and analyses made by us in light of our experience and perception of historical trends, current conditions and expected future developments, as well as other factors believed to be appropriate in the circumstances. However, whether actual results and developments will conform with our expectations and predictions is subject to a number of risks and uncertainties that could cause actual results to differ materially from expectations, including:

· the risks associated with Item 1A of the Company’s 2010 Annual Report on Form 10-K and in Item 1A of this Form 10-Q;

· recorded loss and loss adjustment expense reserves subsequently proving to have been inadequate;

· claims arising from catastrophic events, such as hurricanes, windstorms, earthquakes, floods or terrorist attacks;

· the continued availability and cost of reinsurance;

· competitive forces, including the conduct of other property and casualty insurers and agents;

· changes in domestic or foreign laws or regulations, or their interpretation, applicable to us, our competitors, our agents or our customers;

· the continued availability of capital and financing;

· general economic, market or business conditions;

· an economic downturn or other economic conditions adversely affecting our financial position;

· business opportunities (or lack thereof) that may be presented to us and pursued;

· actions taken by rating agencies from time to time, such as financial strength or credit rating downgrades or placing ratings on negative watch; and

· other factors, most of which are beyond our control.

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Consequently, all of the forward-looking statements made in this report are qualified by these cautionary statements, and there can be no assurance that the actual results or developments anticipated by us will be realized or, even if substantially realized, that they will have the expected consequences to, or effects on, us or our business or operations. We assume no obligation to update publicly any such forward-looking statements, whether as a result of new information, future events or otherwise.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Refer to our 2010 Annual Report on Form 10-K and in particular item 7A — “Quantitative and Qualitative Disclosures About Market Risk”. As of June 30, 2011, there were no material changes to the market risks described in our most recent Annual Report on Form 10-K.

ITEM 4. CONTROLS AND PROCEDURES

Management’s Quarterly Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in the reports that we file or submit under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), as appropriate, to allow timely decisions regarding required financial disclosure.

The CEO and CFO of OneBeacon (the principal executive officer and principal financial officer, respectively) have evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) of the Securities Exchange Act of 1934, as amended) as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on this evaluation, the CEO and CFO have concluded that as of June 30, 2011, our disclosure controls and procedures are adequate and effective to provide reasonable assurance that material information required to be included in our periodic SEC reports is recorded, processed, summarized and reported within the time periods specified in rules and forms. There were no significant changes with respect to our internal control over financial reporting or in other factors that materially affected, or are reasonably likely to materially affect, internal control over financial reporting during the quarter ended June 30, 2011.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

The Company from time to time is involved in various routine legal proceedings. We believe that the outcome of these proceedings, even if determined adversely, would not have a material adverse effect on our business, financial condition and results of operations.

In June 2011, Deutsche Bank Trust Company Americas, Law Debenture Company of New York and Wilmington Trust Company (collectively referred to as the “Plaintiff”), in their capacity as trustees for certain senior notes issued by the Tribune Company (the “Tribune”), filed lawsuits in various jurisdictions against numerous defendants including OneBeacon, OBIC-sponsored benefit plans and other affiliates of White Mountains in their capacity as former shareholders of the Tribune seeking recovery of the proceeds from the sale of common stock of the Tribune in connection with the Tribune’s leveraged buyout in 2007. The Plaintiff seeks recovery of the proceeds received by the former Tribune shareholders on the basis that the Tribune purchased or repurchased its common shares without receiving fair consideration at a time when it was, or as a result of the purchases of shares, was rendered, insolvent. OneBeacon has entered into a joint defense agreement with other affiliates of White Mountains that are defendants in the action. OneBeacon and OBIC-sponsored benefit plans received approximately $32 million for the Tribune common stock it tendered in connection with the leveraged buyout.

ITEM 1A. RISK FACTORS

Our business is subject to a number of risks, including those identified in Item 1A — “Risk Factors” of our 2010 Annual Report on Form 10-K, that could have a material effect on our business, results of operations, financial condition and/or liquidity and that could cause our operating results to vary significantly from period to period. As of June 30, 2011, there have been no material changes to the risk factors disclosed in our most recent Annual Report on Form 10-K, although we may disclose changes to such factors or disclose additional factors from time to time in our future filings with the Securities and Exchange Commission.

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ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

On August 22, 2007, the Company’s board of directors authorized the Company to repurchase up to $200.0 million of its Class A common shares from time to time, subject to market conditions. Shares may be repurchased on the open market or through privately negotiated transactions. This program does not have a stated expiration date. During the three months ended June 30, 2011, no shares were repurchased.

ITEM 6. EXHIBITS

		(a) Exhibits

11*		Statement Re Computation of Per Share Earnings.
31.1**		Certification of T. Michael Miller pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2**		Certification of Paul H. McDonough pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1***		Certification of T. Michael Miller pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2***		Certification of Paul H. McDonough pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.1***		The following financial information from OneBeacon Insurance Group, Ltd.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2011 formatted in XBRL: (i) Consolidated Balance Sheets, June 30, 2011 and December 31, 2010; (ii) Consolidated Statements of Operations and Comprehensive Income, Three and Six Months Ended June 30, 2011 and 2010; (iii) Consolidated Statements of Common Shareholders’ Equity, Six Months Ended June 30, 2011 and 2010; (iv) Consolidated Statements of Cash Flows, Six Months Ended June 30, 2011 and 2010; and (v) Notes to Consolidated Financial Statements.

*		Not included as an exhibit as the information is contained elsewhere within this report. See Note 13 of the Notes to the Consolidated Financial Statements.
**		Filed Herewith
***		Furnished Herewith

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.

	OneBeacon Insurance Group, Ltd.

	By:	/s/ ANN MARIE ANDREWS
		Ann Marie Andrews
Date: July 29, 2011		Chief Accounting Officer