Unum Group - Annual Report: 2010 (Form 10-K)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 10-K

(Mark One)

[X] Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the fiscal year ended December 31, 2010

[  ] 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 1-11294

Unum Group

(Exact name of registrant as specified in its charter)

1 FOUNTAIN SQUARE

CHATTANOOGA, TENNESSEE 37402

(Address of principal executive offices)

423.294.1011

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer as defined in Rule 405 of the Securities Act. Yes [X] No [  ]

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes [  ] No [X]

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [  ]

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 during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes [X] No [  ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [  ]

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.

(Check one): Large accelerated filer [X] Accelerated filer [  ] Non-accelerated filer [  ] Smaller reporting company [  ]

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes [  ] No [X]

The aggregate market value of the shares of the registrant’s common stock held by non-affiliates (based upon the closing price of these shares on the New York Stock Exchange) as of the last business day of the registrant’s most recently completed second fiscal quarter was $7.1 billion. As of February 18, 2011, there were 309,681,578 shares of the registrant’s common stock outstanding.

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DOCUMENTS INCORPORATED BY REFERENCE

Portions of the information required by Part III of this Form 10-K are incorporated herein by reference from the registrant’s definitive proxy statement for its 2011 Annual Meeting of Stockholders which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, within 120 days after the end of the registrant’s fiscal year ended December 31, 2010.

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Cautionary Statement Regarding Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” to encourage companies to provide prospective information, as long as those statements are identified as forward-looking and are accompanied by meaningful cautionary statements identifying important factors that could cause actual results to differ materially from those included in the forward-looking statements. Certain information contained in this Annual Report on Form 10-K (including certain statements in the business description in Item 1, Management’s Discussion and Analysis in Item 7, and the consolidated financial statements and related notes in Item 8), or in any other written or oral statements made by us in communications with the financial community or contained in documents filed with the Securities and Exchange Commission (SEC), may be considered forward-looking. Forward-looking statements are those not based on historical information, but rather relate to future operations, strategies, financial results, or other developments and speak only as of the date made. We undertake no obligation to update these statements, even if made available on our website or otherwise. These statements may be made directly in this document or may be made part of this document by reference to other documents filed by us with the SEC, a practice which is known as “incorporation by reference.” You can find many of these statements by looking for words such as “will,” “may,” “should,” “could,” “believes,” “expects,” “anticipates,” “estimates,” “intends,” “projects,” “goals,” “objectives,” or similar expressions in this document or in documents incorporated herein.

These forward-looking statements are subject to numerous assumptions, risks, and uncertainties, many of which are beyond our control. We caution readers that the following factors, in addition to other factors mentioned from time to time, may cause actual results to differ materially from those contemplated by the forward-looking statements:

All subsequent written and oral forward-looking statements attributable to us or any person acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this section.

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PART I

ITEM 1. BUSINESS

General

Unum Group, a Delaware general business corporation, and its insurance and non-insurance subsidiaries, which collectively with Unum Group we refer to as the Company, operate in the United States, the United Kingdom, and, to a limited extent, in certain other countries around the world. The principal operating subsidiaries in the United States are Unum Life Insurance Company of America (Unum America), Provident Life and Accident Insurance Company (Provident), The Paul Revere Life Insurance Company (Paul Revere Life), and Colonial Life & Accident Insurance Company, and in the United Kingdom, Unum Limited. We are the largest provider of disability insurance products in the United States and the United Kingdom. We also provide a complementary portfolio of other insurance products, including employer- and employee-paid group benefits, life insurance, long-term care insurance, and other related services.

We have three major business segments: Unum US, Unum UK, and Colonial Life. Our other segments are the Individual Disability – Closed Block segment and the Corporate and Other segment. These segments are discussed more fully under “Reporting Segments” included herein in Item 1.

Business Strategies

As one of the leading providers of employee benefits in the U.S. and the U.K., we offer a broad portfolio of products and services to meet the diverse and rapidly changing needs of employers and their employees. Specifically, we offer group, individual, and voluntary benefits — either as stand-alone products or combined with other coverages — that create comprehensive benefits solutions for employers of all sizes by helping them attract and retain a stronger workforce while protecting the incomes and lifestyles of their employees. We believe employer-sponsored benefits represent the single most effective way to provide workers with access to the information and options they need to protect their lifestyle and provide financial security. Working people and their families, particularly those at middle and lower incomes, are perhaps the most vulnerable in today’s economy yet are often overlooked by many providers of financial services and products. For many of these people, employer-sponsored benefits are the primary defense against the potentially catastrophic fallout of death, illness, or injury.

We have established a corporate culture consistent with the social values our products provide. We are committed to not only meeting the needs of our customers who depend on us, but also to operating with integrity and being accountable for our actions. Our sound and consistent business practices, strong internal compliance program, and comprehensive risk management strategy enable us to operate efficiently as well as to identify and address potential areas of risk from all corners of our business. We have also applied these same values to our social responsibility efforts. Because we see important links between the obligations we have to all of our stakeholders, we place a strong emphasis on contributing to positive change in our communities.

We are an industry leader, and we believe we are well-positioned in our sector with solid long-term growth prospects. Given the nature of our business, however, we are sensitive to economic and financial market movements, including consumer confidence, employment levels, and interest rates. Our business outlook, which recognizes both the challenges of the current economic environment as well as the mitigating impact of risk-reducing actions we have taken in recent years, is consistent with our risk appetite. Although the occurrence of one or more of the risk factors discussed herein may cause our results to differ materially from our outlook, our business plan has been tested against a variety of economic scenarios, and we believe we can continue to meet the challenges presented by the current economic environment. We remain cautious of the near-term outlook for employment levels and wages, both of which limit opportunities for premium growth, but we believe we are poised to profitably grow as employment trends improve.

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During 2011, our focus will remain on disciplined top-line growth and capital management. Objectives for the year include:

Reporting Segments

Our reporting segments are comprised of the following: Unum US, Unum UK, Colonial Life, Individual Disability – Closed Block, and Corporate and Other. Measured as a percentage of consolidated premium income for the year ended December 31, 2010, premium income was approximately 65.3 percent for the Unum US segment, 8.8 percent for Unum UK, 14.5 percent for Colonial Life, and 11.4 percent for the Individual Disability – Closed Block and Corporate and Other segments combined.

Financial information is provided in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 and Note 12 of the “Notes to Consolidated Financial Statements” contained herein in Item 8.

Unum US Segment

The Unum US segment includes group long-term and short-term disability insurance, group life and accidental death and dismemberment products, and supplemental and voluntary lines of business. The supplemental and voluntary lines of business are comprised of recently issued disability insurance, group and individual long-term care insurance, and voluntary benefits products. These products are issued primarily by Unum America, Provident, and Paul Revere Life. Paul Revere Life no longer actively markets new business but continues to service its existing business. Premium income for this segment totaled $4,854.6 million in 2010. These products are marketed through our field sales personnel who work in conjunction with independent brokers and consultants. We discontinued selling individual long-term care insurance in 2009.

Group Long-term and Short-term Disability

Group long-term and short-term disability products contributed approximately 42.7 percent of the Unum US segment premium income in 2010. We sell group long-term and short-term disability products to employers for the benefit of employees. Group long-term disability provides employees with insurance coverage for loss of income in the event of extended work absences due to sickness or injury. We offer services to employers and insureds to encourage and facilitate rehabilitation, retraining, and re-employment. Most policies begin providing benefits following 90 or 180 day waiting periods and continue providing benefits until the employee reaches a certain age, generally between 65 and 70. The benefits are limited to specified maximums as a percentage of income.

Group short-term disability insurance generally provides coverage from loss of income due to injury or sickness, effective immediately for accidents and after one week for sickness, for up to 26 weeks, limited to specified maximums as a percentage of income.

Premiums for group long-term and short-term disability are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Some cases carry experience rating provisions. Premiums for experience-rated group long-term and short-term disability business are based on the expected experience of the client given its demographics, industry group, and location, adjusted for the credibility of the specific claim experience of the client. We also offer accounts handled on an administrative services only (ASO) basis, with the responsibility for funding claim payments remaining with the customer. Both group long-term and short-term disability are sold primarily on a basis permitting periodic repricing to address the underlying claims experience.

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We have defined underwriting practices and procedures. If the coverage amount exceeds certain prescribed age and amount limits, we may require a prospective insured to submit evidence of insurability. Policies are typically issued, both at inception and renewal, with rate guarantees. For new group policyholders, the usual rate guarantee is one to three years. For group policies being renewed, the rate guarantee is generally one year, but may be longer. The profitability of the policy depends on the adequacy of the rate during the rate guarantee period. The contracts provide for certain circumstances in which the rate guarantees can be overridden.

Profitability of group long-term and short-term disability insurance is affected by claims experience, investment returns, persistency, and the level of administrative expenses. Morbidity is an important factor in disability claims experience, and many economic and societal factors can affect claim incidence for disability insurance. In general, experience-rated disability coverage for large groups has narrower profit margins and represents less risk to us than business of this type sold to small employers because we bear all of the risk of adverse claims experience in small case fully insured coverages while larger employers often bear much of this risk themselves. We routinely make pricing adjustments, when contractually permitted, which take into account the emerging experience on our group insurance products.

Group Life and Accidental Death and Dismemberment

Group life and accidental death and dismemberment products contributed approximately 24.7 percent of the Unum US segment premium income in 2010. Group life and accidental death and dismemberment products are sold to employers as employee benefit products. Group life consists primarily of renewable term life insurance with the coverages frequently linked to employees’ wages and includes a provision for waiver of premium, if disabled. Accidental death and dismemberment consists primarily of an additional benefit amount payable if death or severe injury is attributable to an accident.

Premiums are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Underwriting and rate guarantees are similar to those used for group disability products, and evidence of insurability is required for benefits in excess of a specified limit.

Profitability of group life and accidental death and dismemberment insurance is affected by claims experience, investment returns, persistency, and the level of administrative expenses.

Individual Disability – Recently Issued

Individual disability – recently issued products generated approximately 9.4 percent of the Unum US segment premium income in 2010. Individual disability – recently issued generally consists of those individual disability policies issued after the substantial changes in product offerings, pricing, distribution, and underwriting which occurred during the period 1994 through 1998 and were generally implemented to improve the overall risk profile of the product. Individual disability is offered primarily to multi-life employer groups, but the policy is owned by the employee and is portable should the employee change employers. Individual disability insurance provides the insured with a portion of earned income lost as a result of sickness or injury. Under an individual disability policy, monthly benefits generally are fixed at the time the policy is written. The benefits typically range from 30 percent to 75 percent of the insured’s monthly earned income. We provide various options with respect to length of benefit periods and waiting periods before benefit payments begin, which permits tailoring of the policy to a specific policyholder’s needs. We also market individual disability policies which include payments for the transfer of business ownership between partners and payments for business overhead expenses. Individual disability products do not provide for the accumulation of cash values.

Premium rates for individual disability products vary by age, gender, and occupation based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience. Our underwriters evaluate the medical and financial condition of prospective policyholders prior to the issuance of a policy. For larger multi-life groups, some underwriting requirements may be waived. The majority of our individual disability – recently issued policies are written on a noncancelable basis. Under a noncancelable policy, as long as the insured continues to pay the fixed annual premium for the policy’s duration, we cannot cancel the policy or raise the premium.

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Profitability of individual disability insurance is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

Group and Individual Long-term Care

Long-term care products generated approximately 12.3 percent of the Unum US segment premium income in 2010. Group long-term care insurance is offered to employers for the benefit of employees. Individual long-term care, which we discontinued selling in 2009, was previously marketed on a single-life customer basis. Long-term care insurance pays a benefit upon the loss of two or more activities of daily living and the insured’s requirement of standby assistance or cognitive impairment. Payment is made on an indemnity basis, regardless of expenses incurred, up to a lifetime maximum. Benefits begin after a waiting period, generally 90 days or less.

Premium rates for long-term care vary by age and gender and are based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience and published industry tables. Underwriting for group long-term care insurance is based primarily on the age and gender of the insured and certain characteristics of the group. There is an “active at work” requirement for insurability, and for coverage above a stated maximum, we evaluate the medical condition of the prospective individual insureds. Long-term care insurance is offered on a guaranteed renewable basis which allows us to re-price in-force policies, subject to regulatory approval.

Profitability is affected by claims experience, investment returns, persistency, and the level of administrative expenses.

Voluntary Benefits

Voluntary benefits products generated approximately 10.9 percent of the Unum US segment premium income in 2010. Voluntary benefits products are sold to groups of employees through payroll deduction at the workplace and include individual universal life and interest-sensitive life, individual disability, group and individual critical illness, and individual cancer products.

Premium rates for voluntary benefits products are based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience and published industry tables. Our underwriters evaluate the medical condition of prospective policyholders prior to the issuance of a policy on a simplified basis. For larger groups with high participation rates, some underwriting requirements may be waived. Voluntary benefits products other than life insurance are offered on a guaranteed renewable basis which allows us to re-price in-force policies, subject to regulatory approval.

Profitability of voluntary benefits products is affected by the level of employee participation, persistency, investment returns, claims experience, and the level of administrative expenses.

Unum UK Segment

The Unum UK segment includes insurance for group long-term disability, group life, and supplemental and voluntary lines of business. The supplemental and voluntary lines of business are comprised of individual disability, group and individual critical illness, and, more recently, voluntary benefits products. These products are issued by Unum Limited and are sold primarily in the United Kingdom through field sales personnel and independent brokers and consultants. Premium income for this segment totaled $650.6 million in 2010, or £420.6 million in local currency.

Group Long-term Disability

Group long-term disability products contributed approximately 64.7 percent of the Unum UK segment premium income in 2010. Group long-term disability products are sold to employers for the benefit of employees. Group long-term disability provides employees with insurance coverage for loss of income in the event of extended work absences due to sickness or injury. Services are offered to employers and insureds to encourage and facilitate

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rehabilitation, retraining, and re-employment. Most policies begin providing benefits following 90 or 180 day waiting periods and continue providing benefits until the employee reaches a certain age, generally between 60 and 65. The benefits are limited to specified maximums as a percentage of income.

Premiums for group long-term disability are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Some cases carry experience rating provisions. Premiums for experience-rated group long-term disability business are based on the expected experience of the client given its demographics, industry group, and location, adjusted for the credibility of the specific claim experience of the client.

We have defined underwriting practices and procedures. If the coverage amount exceeds certain prescribed age and amount limits, we may require a prospective insured to submit evidence of insurability. Policies are typically issued, both at inception and renewal, with rate guarantees. In both cases the usual rate guarantee is two years. Guarantees of one year may be offered either at the request of the client or as required by us to manage risk.

In a very limited number of circumstances guarantees of three years may be offered, but this will be at an additional cost. The profitability of the policy is dependent upon the adequacy of the rate during the rate guarantee period. The contracts provide for certain circumstances in which the rate guarantees can be overridden.

Profitability of group long-term disability insurance is affected by claims experience, investment returns, persistency, and the level of administrative expenses. Morbidity is an important factor in disability claims experience.

Group Life

Group life products contributed approximately 26.4 percent of the Unum UK segment premium income in 2010. Group life products are sold to employers as employee benefit products. Group life consists of two types of products, a renewable term life insurance product providing a lump sum benefit to the beneficiary on death of an employee and a group dependent life product which provides an annuity to the beneficiary on death of an employee. Both coverages are frequently linked to employees’ wages. Premiums for group life are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Underwriting and rate guarantees are similar to those utilized for group long-term disability products.

Profitability of group life is affected by claims experience, investment returns, persistency, and the level of administrative expenses.

Individual Disability

Individual disability products generated approximately 5.2 percent of the Unum UK segment premium income in 2010. Individual disability is offered primarily to individual retail customers. Individual disability insurance provides the insured with a portion of earned income lost as a result of sickness or injury. Under an individual disability policy, monthly benefits generally are fixed at the time the policy is written. The benefits typically range from 30 percent to 50 percent of the insured’s monthly earned income. Various options with respect to length of benefit periods and waiting periods before payment begins are available and permit tailoring of the policy to a specific policyholder’s needs. Individual disability products do not provide for the accumulation of cash values.

Premium rates for individual disability products vary by age, gender, and occupation based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience and published industry tables. Our underwriters evaluate the medical and financial condition of prospective policyholders prior to the issuance of a policy. Approximately one half of our individual disability policies are written on a noncancelable basis. The remainder is offered on a guaranteed renewable basis which allows us to re-price in-force policies.

Profitability of individual disability insurance is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

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Critical Illness

Critical illness products generated approximately 3.7 percent of the Unum UK segment premium income in 2010. Group critical illness products, previously reported with group long-term disability, are sold to groups of employees. Individual critical illness products, previously reported with individual disability, are offered to individual retail customers. Critical illness products provide a lump-sum benefit on the occurrence of a covered critical illness event.

Premiums for group critical illness products are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Underwriting and rate guarantees are similar to those utilized for group long-term disability products. Premium rates for individual critical illness products vary by age and gender based on assumptions concerning morbidity, persistency, administrative expenses, and investment income. Individual critical illness insurance is offered on a guaranteed renewable basis which allows us to re-price in-force policies. We develop our assumptions based on our own claims experience and published industry tables. Our underwriters evaluate the medical condition of prospective policyholders prior to the issuance of a policy.

Profitability of these products is affected by the level of employee participation, persistency, claims experience, investment returns, and the level of administrative expenses.

Voluntary Benefits

Unum UK launched its initial voluntary benefits product offering in the U.K. marketplace during the fourth quarter of 2010. The product offering includes group disability, group life, and group critical illness products. These products are sold to groups of employees through payroll deduction at the workplace.

Premium rates for voluntary benefits products are based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience and published industry tables. The extent of underwriting for these policies is based on guaranteed issue amounts, size of policy, and participation percentage. Policies include rate guarantees at inception and at renewal, generally for a period of two years.

Profitability of voluntary benefits products is affected by the level of employee participation, persistency, investment returns, claims experience, and the level of administrative expenses.

Colonial Life Segment

The Colonial Life segment includes insurance for accident, sickness, and disability products, life products, and cancer and critical illness products issued primarily by Colonial Life & Accident Insurance Company and marketed to employees at the workplace through an agency sales force and brokers. Premium income for this segment totaled $1,075.7 million in 2010.

Accident, Sickness, and Disability

The accident, sickness, and disability product line, which generated approximately 61.5 percent of the Colonial Life segment premium income in 2010, consists of short-term disability plans as well as accident-only plans providing benefits for injuries on a specified loss basis. It also includes accident and health plans covering hospital admissions, confinement, and surgeries on an indemnity basis and group limited benefit medical plans which provide limited indemnity benefits for basic healthcare expenses.

Premiums for accident, sickness, and disability products are generally based on assumptions for morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience. Premiums are primarily individual guaranteed renewable wherein we have the ability to change premiums on a state by state basis. A small percentage of the policies are written on a group basis wherein we retain the right to change premiums at the individual account level. We have defined underwriting practices and procedures for each of our products. Most policies are issued on a simplified issue basis, based on answers to simple health and employment questions. If the amount applied for exceeds certain levels, the applicant may be asked to answer additional health questions or submit to additional medical examinations.

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Profitability is affected by the level of employee participation, persistency, claims experience, investment returns, and the level of administrative expenses.

The accident and health products qualify as fringe benefits that can be purchased with pre-tax employee dollars as part of a flexible benefits program pursuant to Section 125 of the Internal Revenue Code. Flexible benefits programs assist employers in managing benefit and compensation packages and provide policyholders the ability to choose benefits that best meet their needs. Laws could be changed to limit or eliminate fringe benefits available on a pre-tax basis, eliminating our ability to continue marketing our products this way. However, we believe our products provide value to our policyholders that will remain even if the tax advantages offered by flexible benefits programs are modified or eliminated.

Life

Group and individual life products contributed approximately 16.4 percent of the Colonial Life segment premium income in 2010 and are primarily comprised of universal life, whole life, level term life, and a small block of group term life policies.

Premium rates vary by age and gender and are based on assumptions concerning mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience and published industry tables. Premiums for the whole life and level term products are guaranteed for the life of the contract. Premiums for the universal life products are flexible and may vary at the individual policyholder level. For the group term life product, we retain the right to change premiums at the account level based on the experience of the account.

Profitability is affected by the level of employee participation, persistency, claims experience, investment returns, and the level of administrative expenses.

Cancer and Critical Illness

Cancer and critical illness policies generated approximately 22.1 percent of the Colonial Life segment premium income in 2010. Cancer policies provide various benefits for the treatment of cancer including hospitalization, surgery, radiation, and chemotherapy. Critical illness policies provide a lump-sum benefit on the occurrence of a covered critical illness event.

Premiums are generally based on assumptions for morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience. Premiums are primarily individual guaranteed renewable wherein we have the ability to change premiums on a state by state basis.

Profitability of these products is affected by the level of employee participation, persistency, claims experience, investment returns, and the level of administrative expenses.

Individual Disability – Closed Block Segment

The Individual Disability – Closed Block segment generally consists of those individual disability policies in-force before the substantial changes in product offerings, pricing, distribution, and underwriting, which generally occurred during the period 1994 through 1998. A small amount of new business continued to be sold after these changes, but we stopped selling new policies in this segment at the beginning of 2004 other than update features contractually allowable on existing policies. Premium income for this segment totaled $847.0 million in 2010.

The majority of the policies included in this segment represent individual disability insurance which was written on a noncancelable basis. Profitability is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

We have reinsurance agreements in place providing for reimbursement of a proportion of losses in excess of an attachment point and for which such losses are capped by a maximum loss limit.

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Corporate and Other Segment

The Corporate and Other segment includes investment income on corporate assets not specifically allocated to a line of business, interest expense on corporate debt other than non-recourse debt, and certain other corporate income and expense not allocated to a line of business. Corporate and Other also includes results from certain Unum US insurance products not actively marketed, including individual life and corporate-owned life insurance, reinsurance pools and management operations, group pension, health insurance, and individual annuities.

Premium income for the insurance products in this segment totaled $3.5 million in 2010. We expect operating revenue and income from these insurance products to decline over time as these business lines wind down.

Reinsurance

In the normal course of business, we assume reinsurance from and cede reinsurance to other insurance companies. In a reinsurance transaction, a reinsurer agrees to indemnify another insurer for part or all of its liability under a policy or policies it has issued for an agreed upon premium. The primary purpose of ceded reinsurance is to limit losses from large exposures. However, if the assuming reinsurer is unable to meet its obligations, we remain contingently liable. We evaluate the financial condition of reinsurers to whom we cede business and monitor concentration of credit risk to minimize our exposure. We may also require assets to be held in trust, letters of credit, or other acceptable collateral to support reinsurance recoverable balances.

In general, the maximum amount of risk retained by our U.S. insurance subsidiaries and not ceded is $750,000 per covered life per policy under a group or individual life policy and $750,000 per covered life per policy under a group or individual accidental death and dismemberment policy. For Unum Limited, we generally retain £1.0 million per covered life. The amount of risk retained on individual disability products varies by policy type and year of issue. Other than catastrophic reinsurance coverage, we generally do not reinsure group or individual disability policies issued subsequent to 1999.

We have global catastrophic reinsurance coverage which includes four layers of coverage to limit our exposure under life, accidental death and dismemberment, long-term care, and disability policies in regards to a catastrophic event. We have 50 percent reinsurance coverage in the first layer and 80 percent coverage in the other three layers for a total of $305.0 million of catastrophic reinsurance coverage, after a $50.0 million deductible. Each of the first two layers provides $50.0 million of coverage, the third layer provides $100.0 million of coverage, and the fourth layer provides $200.0 million of coverage. Each layer provides coverage for all catastrophic events, including acts of war and any type of terrorism. In addition to the global catastrophic reinsurance coverage noted above, Unum Limited has an additional catastrophic treaty integrated with the global treaty to limit the exposure under group life and group dependent policies as a result of a catastrophic event. The coverage is placed at 100 percent for a total of £150.0 million of catastrophic reinsurance coverage, after a £200.0 million deductible. The coverage is for all catastrophic events, including acts of war and any type of terrorism. Events may occur which limit or eliminate the availability of catastrophic reinsurance coverage in future years.

The reinsurance recoverable of $4,827.9 million at December 31, 2010 relates to 93 companies. Fourteen major companies account for approximately 91 percent of the reinsurance recoverable at December 31, 2010, and all of these companies are rated A or better by A.M. Best Company (AM Best) or are fully securitized by letters of credit or investment-grade fixed maturity securities held in trust. Of the remaining reinsurance recoverable, approximately eight percent relates to business reinsured either with companies rated A- or better by AM Best, with overseas entities with equivalent ratings or backed by letters of credit or trust agreements, or through reinsurance arrangements wherein we retain the assets in our general account. Approximately one percent of the reinsurance recoverable is held by companies either rated below A- by AM Best or not rated.

The collectibility of our reinsurance recoverable is primarily a function of the solvency of the individual reinsurers. Although we have controls to minimize our exposure, the insolvency of a reinsurer or the inability or unwillingness of a reinsurer to comply with the terms of a reinsurance contract could have a material adverse effect on our results of operations.

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For further discussion of our reinsurance activities, refer to “Risk Factors” contained herein in Item 1A and Note 11 of the “Notes to Consolidated Financial Statements” contained herein in Item 8.

Reserves for Policy and Contract Benefits

The applicable insurance laws under which insurance companies operate require that they report, as liabilities, policy reserves to meet future obligations on their outstanding policies. These reserves are the amounts which, with the additional premiums to be received and interest thereon compounded annually at certain assumed rates, are calculated to be sufficient to meet the various policy and contract obligations as they mature. These laws specify that the reserves shall not be less than reserves calculated using certain specified mortality and morbidity tables, interest rates, and methods of valuation.

The reserves reported in our financial statements contained herein are calculated in conformity with U.S. generally accepted accounting principles (GAAP) and differ from those specified by the laws of the various states and reported in the statutory financial statements of our life insurance subsidiaries. These differences result from the use of mortality and morbidity tables and interest assumptions which we believe are more representative of the expected experience for these policies than those required for statutory accounting purposes and also result from differences in actuarial reserving methods.

The assumptions we use to calculate our reserves are intended to represent an estimate of experience for the period that policy benefits are payable. If actual experience is not less favorable than our reserve assumptions, then reserves should be adequate to provide for future benefits and expenses. If experience is less favorable than the reserve assumptions, additional reserves may be required. The key experience assumptions include disability claim incidence rates, disability claim recovery rates, mortality rates, policy persistency, and interest rates. We periodically review our experience and update our policy reserves for new issues and reserves for all claims incurred, as we believe appropriate.

The consolidated statements of income include the annual change in reserves for future policy and contract benefits. The change reflects a normal accretion for premium payments and interest buildup and decreases for policy terminations such as lapses, deaths, and benefit payments.

For further discussion of reserves, refer to “Risk Factors” contained herein in Item 1A, “Critical Accounting Estimates” and the discussion of segment operating results included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7, and Note 5 of the “Notes to Consolidated Financial Statements” contained herein in Item 8.

Investments

Investment activities are an integral part of our business, and profitability is significantly affected by investment results. We segment our invested assets into portfolios that support our various product lines. Generally, our investment strategy for our portfolios is to match the effective asset cash flows and durations with related expected liability cash flows and durations to consistently meet the liability funding requirements of our businesses. We seek to earn investment income while assuming credit risk in a prudent and selective manner, subject to constraints of quality, liquidity, diversification, and regulatory considerations. Our overall investment philosophy is to invest in a portfolio of high quality assets that provide investment returns consistent with that assumed in the pricing of our insurance products. Assets are invested predominately in fixed maturity securities. Changes in interest rates may affect the amount and timing of cash flows.

We actively manage our asset and liability cash flow match and our asset and liability duration match to limit interest rate risk. We may redistribute investments between our different lines of business, when necessary, to adjust the cash flow and/or duration of the asset portfolios to better match the cash flow and duration of the liability portfolios. Asset and liability portfolio modeling is updated on a quarterly basis and is used as part of the overall interest rate risk management strategy. Cash flows from the in-force asset and liability portfolios are projected at current interest rate levels and also at levels reflecting an increase and a decrease in interest rates to obtain a range of projected cash flows under the different interest rate scenarios. These results enable us to assess the impact of

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projected changes in cash flows and duration resulting from potential changes in interest rates. Testing the asset and liability portfolios under various interest rate scenarios enables us to choose the most appropriate investment strategy as well as to limit the risk of disadvantageous outcomes. We use this analysis in determining hedging strategies and utilizing derivative financial instruments for managing interest rate risk and the risk related to matching duration for our assets and liabilities. We do not use derivative financial instruments for speculative purposes.

Refer to “Risk Factors” contained herein in Item 1A, “Critical Accounting Estimates” and the discussion of investments in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7, and Notes 2, 3, and 4 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for information on our investments and derivative financial instruments.

Ratings

AM Best, Fitch Ratings (Fitch), Moody’s Investors Service (Moody’s), and Standard & Poor’s Corporation (S&P) are among the third parties that assign issuer credit ratings to Unum Group and financial strength ratings to our insurance subsidiaries. Issuer credit ratings reflect an agency’s opinion of the overall financial capacity of a company to meet its senior debt obligations. Financial strength ratings are specific to each individual insurance subsidiary and reflect each rating agency’s view of the overall financial strength (capital levels, earnings, growth, investments, business mix, operating performance, and market position) of the insuring entity and its ability to meet its obligations to policyholders. Both the issuer credit ratings and financial strength ratings incorporate quantitative and qualitative analyses by rating agencies and are routinely reviewed and updated on an ongoing basis.

Rating agencies assign an outlook statement of “positive,” “negative,” or “developing” to indicate an intermediate-term trend in credit fundamentals which could lead to a rating change. “Positive” means that a rating may be raised, “negative” means that a rating may be lowered, and “developing” means that a rating may be raised or lowered with equal probability. Alternatively, a rating may have a “stable” outlook to indicate that the rating is not expected to change.

“Credit watch” or “under review” highlights the potential direction of a short-term or long-term rating. It focuses on identifiable events and short-term trends that cause a rating to be placed under heightened surveillance by a rating agency. Events that may trigger this action include mergers, acquisitions, recapitalizations, or anticipated operating developments. Ratings may be placed on credit watch or under review when an event or a change in an expected trend occurs and additional information is needed to evaluate the current rating level. This status does not mean that a rating change is inevitable, and ratings may change without first being placed on a watch list.

Our financial strength ratings as of February 2011 for our principal U.S. domiciled insurance company subsidiaries were:

Our issuer credit ratings for Unum Group as of February 2011 were:

As of February 2011, all four rating agencies have a “stable” outlook for our Company. None of the ratings are currently under review or on credit watch. See further discussion in “Risk Factors” contained herein in Item 1A and in “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Ratings” contained herein in Item 7. A rating is not a recommendation to buy, sell, or hold securities and may be subject to revision or withdrawal at any time by the rating agency. Each rating should be evaluated independently of any other rating.

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Competition

There is intense competition among insurance companies for the types of products we sell. We believe that the principal competitive factors affecting our business are integrated product choices, price, quality of customer service and claims management, financial strength, and claims-paying ratings. In the individual and group disability markets, we compete in the United States with a limited number of major companies and regionally with other companies offering specialty products. Our principal competitors for our other products, including group life and long-term care as well as the product offerings sold to groups of employees through payroll deduction, include the largest insurance companies in the United States. Some of these companies have more competitive pricing or have higher claims-paying ratings. Some may also have greater financial resources with which to compete.

In the United Kingdom, we compete for individual and group products with a number of large internationally recognized providers. The life insurance market continues to go through a restructuring phase which has led to opportunities for both the strong specialist supplier and also new organizations that have recently been established to handle the run-off of closed businesses. Current penetration levels indicate that there is still significant upside growth potential in the United Kingdom for the types of products we offer.

All areas of the employee benefits markets are highly competitive due to the yearly renewable term nature of the products and the large number of insurance companies offering products in this market. There is a risk that purchasers of employee benefits products may be able to obtain more favorable terms from competitors in lieu of renewing coverage with us. The effect of competition may, as a result, adversely affect the persistency of these and other products, as well as our ability to sell products in the future.

We must attract and retain independent agents and brokers to actively market our products. Strong competition exists among insurers for agents and brokers. We compete with other insurers for sales agents and brokers primarily on the basis of our product offerings, financial strength, support services, and compensation. Sales of our products could be materially adversely affected if we are unsuccessful in attracting and retaining agents and brokers.

For further discussion, refer to “Risk Factors” contained herein in Item 1A.

Regulation

General

Our U.S. insurance subsidiaries are subject to comprehensive regulation and oversight by insurance departments in jurisdictions in which they do business and by the U.S. Department of Labor (DOL) on a national basis, primarily for the protection of policyholders. Unum Limited is subject to regulation by the Financial Services Authority (FSA) in the U.K. The state insurance departments in the U.S. and the FSA in the U.K. have broad administrative powers with respect to all aspects of the insurance business and, in particular, monitor the manner in which an insurance company offers, sells, and administers its products. This monitoring may include reviewing sales practices, including the content and use of advertising materials and the licensing and appointing of agents and brokers, as well as underwriting, claims, and customer service practices. The DOL enforces a comprehensive federal statute which regulates claims paying fiduciary responsibilities and reporting and disclosure requirements for most employee benefit plans. Our domestic insurance subsidiaries must meet the standards and tests for investments imposed by state insurance laws and regulations of the jurisdictions in which they are domiciled. Domestic insurance subsidiaries operate under insurance laws which require they establish and carry, as liabilities, statutory reserves to meet policyholder obligations. These reserves are verified periodically by various regulators. Our domestic insurance subsidiaries are examined periodically by examiners from their states of domicile and by other states in which they are licensed to conduct business. The domestic examinations have traditionally emphasized financial matters from the perspective of protection of policyholders, but they can and have covered other subjects that an examining state may be interested in reviewing, such as market conduct issues. Other states more typically perform market conduct examinations that include a review of a company’s sales practices, including advertising and licensing of agents and brokers, as well as underwriting, claims, and customer service practices to determine compliance with state laws.

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Capital Requirements

Risk-based capital (RBC) standards for U.S. life insurance companies have been prescribed by the National Association of Insurance Commissioners (NAIC). The domiciliary states of our U.S. insurance subsidiaries have all adopted a version of the RBC model formula of the NAIC, which prescribes a system for assessing the adequacy of statutory capital and surplus for all life and health insurers. The basis of the system is a risk-based formula that applies prescribed factors to the various risk elements in a life and health insurer’s business to report a minimum capital requirement proportional to the amount of risk assumed by the insurer. The life and health RBC formula is designed to measure annually (i) the risk of loss from asset defaults and asset value fluctuations, (ii) the risk of loss from adverse mortality and morbidity experience, (iii) the risk of loss from mismatching of asset and liability cash flow due to changing interest rates, and (iv) business risks. The formula is used as an early warning tool to identify companies that are potentially inadequately capitalized. The formula is intended to be used as a regulatory tool only and is not intended as a means to rank insurers generally.

The NAIC’s Solvency Modernization Initiative (SMI) began in June 2008. The SMI is a self-examination of the United States’ insurance solvency regulation framework and includes a review of international developments regarding insurance supervision, banking supervision, and international accounting standards and their potential use in U.S. insurance regulation. The SMI is a wide-ranging initiative that, by its nature, will evolve to respond to national and international insurance regulatory and solvency developments. Current SMI goals and the principles developed through the SMI’s exploration of capital requirements, group solvency, reinsurance, and international accounting will likely result in significant changes to U.S. insurance regulation and solvency standards.

Unum Limited is subject to regulation, including capital adequacy requirements and minimum solvency margins, by the FSA in the U.K. Current solvency standards require an insurance company to hold capital equal to the greater of (i) a formulaic calculation of capital related to liabilities or (ii) a risk-based assessment of capital which is company specific reflecting the insurance company’s individual risk profile. Unum Limited will adopt new capital requirements and risk management standards, Solvency II, resulting from a fundamental review of the capital adequacy standards for the European insurance industry. Solvency II will replace the current capital requirements for Unum Limited. Solvency II requirements are still being developed and have not yet been adopted, but the current proposals contain new requirements on capital adequacy and risk management for insurers, including (i) requirements to demonstrate adequate financial resources, including quantitative requirements, technical provisions, and calculation of Solvency II capital requirements through either an approved full or partial internal model or the European standard formula approach, (ii) requirements to demonstrate an adequate system of governance, including effective risk management and prospective risk identification, and (iii) disclosure and regulatory reporting requirements. The effective adoption date is expected to be January 1, 2013.

Our Bermuda-based insurance subsidiary is subject to regulation by the Bermuda Monetary Authority (BMA). Last year the BMA initiated a comprehensive review of its insurance regulatory and solvency framework. Throughout 2010, the BMA published and released a series of consultation papers with the stated purpose of being recognized as equivalent under the Solvency II directive. The BMA is working with European regulators and hopes to complete the assessment during the summer of 2011. The scope and scale of its proposed change is potentially broad, and requirements are expected to vary by insurer licensing classification. It is too early to assess the impact, but the insurance industry may ultimately be subject to new rules regarding governance, administrative and accounting processes, and/or long-term capital requirements.

See further discussion in “Risk Factors” contained herein in Item 1A and “Liquidity and Capital Resources” contained herein in Item 7.

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Insurance Holding Company Regulation

We are subject to regulation under the insurance holding company laws in the states in which our insurance subsidiaries are domiciled (or deemed to be commercially domiciled), which currently include Maine, Massachusetts, Tennessee, South Carolina, New York, Vermont, and California. These laws generally require each insurance company that is domiciled in the state and a member of an insurance holding company system to register with the insurance department of that state and to furnish at least annually financial and other information about the operations of companies within the holding company system, including intercompany transactions.

In addition, the laws of most states, including the states in which our insurance subsidiaries are domiciled (or deemed to be commercially domiciled), require regulatory approval of a change in control of an insurance company or its holding company. Where these laws apply to us, there can be no effective change in control of our Company or of any of our insurance subsidiaries unless the person seeking to acquire control has filed a statement containing specified information with the appropriate insurance regulators and has obtained their prior approval of the proposed change. The usual measure for a presumptive change of control pursuant to these laws is the acquisition of 10 percent or more of the voting stock of an insurance company or its holding company, although this presumption is rebuttable. Consequently, a person acquiring 10 percent or more of the voting stock of an insurance company or its holding company without the prior approval of the insurance regulators in the state(s) of domicile of the insurance company(ies) sought to be acquired (or whose holding company is sought to be acquired) will be in violation of these laws. Such a person may also be subject to one or more of the following actions: (i) injunctive action requiring the disposition or seizure of those securities by the applicable insurance regulators; (ii) prohibition of voting of such shares; and (iii) other actions determined by the relevant insurance regulators. Further, many states’ insurance laws require that prior notification be given to state insurance regulators of a change in control of a non-domiciled insurance company doing business in the state. These pre-notification statutes do not authorize the state insurance regulators to disapprove the change in control; however, they do authorize regulatory action in the affected state if particular conditions exist, such as undue market concentration. Any future transactions that would constitute a change in control of our Company or of any of our insurance subsidiaries may require prior notification in those states that have adopted pre-notification laws.

These laws may discourage potential acquisition proposals and may delay, deter, or prevent a change in control of our Company, including through transactions, and in particular unsolicited transactions, that some or all of our shareholders might consider to be desirable.

In addition, such laws and regulations restrict the amount of dividends that may be paid by our insurance subsidiaries to their respective shareholders, including our Company and certain of our intermediate holding company subsidiaries. See further discussion in “Risk Factors” contained herein in Item 1A and “Liquidity and Capital Resources – Cash Available from Subsidiaries” contained herein in Item 7.

We are also subject to regulation under applicable regulations and reporting requirements in the foreign jurisdictions in which we or our affiliates do business or have done business.

Federal Laws and Regulations

The Dodd-Frank Wall Street Reform and Consumer Protection Act (Dodd-Frank), which effects comprehensive changes to the regulation of financial services in the United States, will subject us to potentially significant additional federal regulation. Dodd-Frank directs existing and newly-created government agencies and bodies to promulgate regulations implementing the law, a process anticipated to occur over the next few years. Among other provisions impacting or potentially impacting us, Dodd-Frank:

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The USA PATRIOT Act of 2001 (Patriot Act) contains anti-money laundering and financial transparency laws and mandates the implementation of various new regulations applicable to broker-dealers and other financial services companies, including insurance companies. The Patriot Act seeks to promote cooperation among financial institutions, regulators and law enforcement entities in identifying parties that may be involved in terrorism or money laundering. Anti-money laundering laws outside of the United States contain some similar provisions. The increased obligations of financial institutions to identify their customers, watch for and report suspicious transactions, respond to requests for information by regulatory authorities and law enforcement agencies, and share information with other financial institutions, require the implementation and maintenance of internal practices, procedures, and controls.

For further discussion of regulation, refer to “Risk Factors” contained herein in Item 1A.

Geographic Areas

Segment operating revenue, which excludes net realized investment gains and losses, for our U.K. operations totaled $845.8 million, $828.2 million, and $1,086.1 million for 2010, 2009, and 2008, respectively. These amounts were approximately 8.3 percent, 8.2 percent, and 10.4 percent of consolidated segment operating revenue for 2010, 2009, and 2008, respectively. As of December 31, 2010, total assets and liabilities for our U.K. operations were $3.6 billion and $2.5 billion, respectively, or approximately 6.3 percent and 5.2 percent of consolidated assets and liabilities, respectively. Fluctuations in the U.S. dollar relative to the local currency of our U.K. operations will impact our reported operating results. See “Risk Factors” contained herein in Item 1A for further discussion of fluctuations in foreign currency exchange rates. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 and Note 12 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for further discussion of Unum UK’s operating results.

Employees

At December 31, 2010, we had approximately 9,500 full-time employees.

Available Information

Our internet website address is www.unum.com. We make available, free of charge, on or through our website our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after filing such material with the Securities and Exchange Commission.

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Executive Officers of the Registrant

Our executive officers, all of whom are also executive officers of certain of our principal subsidiaries, were appointed by Unum Group’s board of directors to serve until their successors are chosen and qualified or until their earlier resignation or removal.

Mr. Watjen became President and Chief Executive Officer in March 2003. He served as Vice Chairman and Chief Operating Officer from May 2002 until March 2003. He became Executive Vice President, Finance in June 1999 and assumed the additional Risk Management responsibilities in November 1999. Mr. Watjen originally joined a Unum Group predecessor company as Executive Vice President and Chief Financial Officer in 1994.

Mr. Best was named Executive Vice President, Global Business Technology in March 2010. Prior to that, he served as Executive Vice President, Chief Operating Officer, Unum US from January 2007 and Executive Vice President, Service Operations and Chief Information Officer from January 2006 to January 2007. He served as Executive Vice President, The Client Services Center, and Chief Information Officer from May 2003. Mr. Best originally joined a Unum Group predecessor company as Senior Vice President and Chief Information Officer in 1994.

Mr. Bishop became Executive Vice President and General Counsel in October 2008. Prior to this appointment, he officially began serving as Interim General Counsel in April 2008. From August 1979 through September 2008, Mr. Bishop practiced corporate and securities law with the law firm of Miller & Martin PLLC, except during the period from January 2005 through July 2007 when he was employed as deputy general counsel and corporate secretary of Coca-Cola Enterprises Inc.

Mr. Horn was named Executive Vice President, President and Chief Executive Officer, Colonial Life in May 2007. Prior to that, he served as Executive Vice President, President and Chief Executive Officer of Colonial Life & Accident Insurance Company from March 2004. Before joining the Company, he served as Executive Vice President of Mutual of Omaha Insurance Company from 1993 until 2003, having joined that company in 1981.

Mr. McCarthy was named Executive Vice President, President and Chief Executive Officer, Unum US in May 2007. He previously served as Executive Vice President, President, Unum US from January 2007. Prior to that, he served as Executive Vice President, Risk Operations from January 2006. He previously served as Executive Vice President, Underwriting from May 2003. Mr. McCarthy originally joined a Unum Group predecessor company in 1976.

Mr. McGarry was named Executive Vice President, President and Chief Executive Officer, Unum UK in July 2010. He previously served as Senior Vice President, Benefits, Individual Disability, and National Client Group Business, for Unum US from January 2010. Prior to that, he served in various other capacities within Unum US, including Senior Vice President, Benefits Operations and Risk Management from March 2008 to January 2010, Senior Vice President, Benefits Operations from January 2006 to March 2008, and Senior Vice President, Underwriting Operations from August 2005 to January 2006. Mr. McGarry originally joined a Unum Group predecessor company in 1986.

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Mr. McKenney was named Executive Vice President and Chief Financial Officer in August 2009, having joined the Company in July 2009. Before joining the Company, Mr. McKenney served as Executive Vice President and Chief Financial Officer of Sun Life Financial Inc., an international financial services company, since February 2007, having joined that company as Executive Vice President in September 2006. He served as Senior Vice President and Chief Financial Officer of Genworth Financial, Inc., a global financial security company, from May 2004 until August 2006.

ITEM 1A. RISK FACTORS

We face a wide range of risks, and our continued success depends on our ability to identify and appropriately manage our risk exposures. Discussed below are certain factors that may adversely affect our business, results of operations, or financial condition. Any one or more of the following factors may cause our actual results for various financial reporting periods to differ materially from those expressed in any forward looking statements made by or on behalf of the Company, including those in this document or made by us elsewhere, such as in earnings release investor calls, investor conference presentations, or press releases. The risks and uncertainties described herein may not be the only ones we face. Additional risks and uncertainties not presently known to us or that we currently believe to be immaterial may also adversely affect our business. See “Cautionary Statement Regarding Forward-Looking Statements” contained herein on page 1.

Unfavorable economic conditions may result in lower premium growth, higher disability claims incidence, or longer claims duration.

As a large financial institution, we are affected by conditions in the capital markets and the general economy, both in the United States and in the United Kingdom. Adversity in the capital markets and the general economy may adversely affect our business and results of operations. In particular, factors such as unemployment levels, consumer confidence levels, consumer spending, business investment, government spending, the volatility and strength of the capital markets, and inflation all affect the business and economic environment and, ultimately, the amount and profitability of our businesses. Given the nature of our products, in an economic environment characterized by higher unemployment, lower personal income, reduced consumer spending, and lower corporate earnings and investment, new product sales may be adversely affected. Our premium growth may also be negatively impacted by lower premium growth from existing customers due to lower salary growth and lower growth in the number of employees covered under an existing policy. In addition, during such periods we may experience higher disability claims incidence, longer disability claims duration, and/or an increase in policy lapses.

We and our insurance subsidiaries are subject to extensive supervision and regulation, which may affect the cost or demand for our products, may increase capital requirements for our insurance subsidiaries, or may impact our profitability or growth.

Our insurance company subsidiaries may not be able to obtain or maintain necessary licenses, permits, authorizations, or accreditations, or may be able to do so only at great cost. In addition, we may not be able to comply fully with, or obtain appropriate exemptions from, the wide variety of laws and regulations applicable to insurance companies and insurance holding companies. Failure to comply with or to obtain appropriate exemptions under any applicable laws could result in restrictions on our ability to do business in one or more of the jurisdictions in which we operate and could result in fines and other sanctions, which may have a material adverse effect on our business or results of operations.

It is possible that there will be heightened oversight of insurers by regulatory authorities in the jurisdictions in which our subsidiaries are domiciled and operate. We cannot predict specific proposals that might be adopted, or what impact, if any, such proposals or, if enacted, such laws, could have on our business, results of operations, or financial condition. The NAIC or state regulators may adopt revisions to the RBC formula, the FSA may revise its capital adequacy requirements and minimum solvency margins, other jurisdictions in which our subsidiaries operate, including the BMA, may increase their capital requirements, or rating agencies may incorporate higher capital thresholds into their quantitative analyses, thus requiring additional capital for our insurance subsidiaries. Increased financial services regulation, such as the NAIC Solvency Modernization Initiative and the European Commission’s Solvency II, may impose greater quantitative requirements, supervisory review, and disclosure requirements and may impact the business strategies, capital requirements, and profitability of our insurance subsidiaries.

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New programs, including healthcare reform or financial services sector reform, may compete with or diminish the need for our products, particularly as it may affect our ability to sell our products through employers or in the workplace.

Congress, as well as foreign, state, and local governments, could enact legislation related to changes in tax laws or tax rates or could eliminate current tax deductions. Any of these events could increase our tax costs or affect the desirability of our products to customers. Legislative changes related to pension funding requirements could negatively impact our cash flows from operations and our profitability.

The enactment of the Dodd-Frank Wall Street Reform and Consumer Protection Act will subject us to potentially significant additional federal regulation. The requirements of the regulations ultimately adopted could affect the financial markets generally and could impact our business, credit or financial strength ratings, results of operations, cash flows or financial condition, and the requirement, availability, or cost of capital. See “Regulation” contained herein in Item 1.

Most group long-term and short-term disability plans we administer are governed by the Employee Retirement Income Security Act (ERISA). Changes to ERISA enacted by Congress or via judicial interpretations may adversely affect the risk to us of managing employee benefit plans, increase the premiums associated with such plans, and ultimately affect their affordability and our profitability.

The insurance departments in jurisdictions wherein our insurance subsidiaries conduct business may limit our ability to obtain rate increases under guaranteed renewable contracts and may require changes in rates and/or benefits to meet minimum loss ratio requirements which could negatively impact the profitability of our products.

Many regulatory and governmental bodies have the authority to review our products and business practices and those of our agents and employees. These regulatory or governmental bodies may bring regulatory or other legal actions against us if, in their view, our practices are improper. These actions can result in substantial fines or restrictions on our business activities and may have a material adverse effect on our business or results of operations.

Regulatory examinations or investigations could result in, among other things, changes in our claims handling practices, changes in business practices, including changes in broker compensation and related disclosure practices, changes in the use and oversight of reinsurance, changes in governance and other oversight procedures, fines, and other administrative action. Such results, singly or in combination, may injure our reputation, cause negative publicity, adversely affect our issuer credit ratings and financial strength ratings, place us at a competitive disadvantage in marketing or administering our products, or impair our ability to sell or retain insurance policies, thereby adversely affecting our business, and potentially materially adversely affecting the results of operations. Determination by regulatory authorities that we have engaged in improper conduct may also adversely affect our defense of various lawsuits. See “Regulation” contained herein in Item 1 and Note 13 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for further discussion.

Sustained periods of low interest rates in the long-term investment market may adversely affect our reported net investment income and our ability to purchase securities at rates of return assumed in the pricing and reserving for our insurance products, which may have a material adverse effect on our results of operations or financial condition.

An interest, or discount, rate is used in calculating our policyholder reserves. We set our reserve discount rate assumptions based on our current and expected future investment yield for assets supporting the reserves, considering current and expected future market conditions. Continued low interest rates and yields on fixed income investments may cause the rates of return on our investment portfolio to decrease more than expected, leading to lower net investment income than assumed in the pricing and reserving for our insurance products. If the discount rate assumed in our reserve calculations is higher than our future investment returns, our invested assets will not earn enough investment income to support our future claim payments. In that case, the reserves may eventually be insufficient.

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See “Reserves for Policy and Contract Benefits” contained herein in Item 1 and “Critical Accounting Estimates” included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 for further discussion.

Changes in the risk results of our segments or lines of businesses may materially adversely affect our results or operations or financial condition.

In recent years, we have experienced improved risk results in various lines of business, with lower benefits and change in reserves for future benefits relative to premium income. These results may not be indicative of future performance due to, among other things, changes in our mix of business, re-pricing of certain lines of business, or any number of economic cyclical effects on our business. In addition, reserves, whether calculated under GAAP or statutory accounting principles, do not represent an exact calculation of future benefit liabilities but are instead estimates made by us using actuarial and statistical procedures. Actual claim experience may differ from our reserve assumptions. There can be no assurance that our reserves will be sufficient to fund our future liabilities in all circumstances. Future loss development may require reserves to be increased, which would adversely affect earnings in current and future periods. Adjustments to reserve amounts may be required in the event of changes from the assumptions regarding future morbidity (the incidence of claims and the rate of recovery, including the effects thereon of inflation and other societal and economic factors); persistency; mortality (improved life expectancies may require an increase in reserves for long-tailed products such as individual disability and long-term care); policy benefit offsets, including those for social security; and interest rates used in calculating the reserve amounts. See “Reserves for Policy and Contract Benefits” contained herein in Item 1 and “Critical Accounting Estimates” included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 for further discussion.

In addition to interest rate risk as previously discussed, we are exposed to other risks related to our investment portfolio which may adversely affect our results of operations, financial condition, or liquidity. These risks include default risk, credit spread fluctuations, the contractual terms of derivative contracts, the accuracy of valuations of securities, and the possibility that we might need to sell securities at disadvantageous times.

Investments are an integral part of our business, and our investments support our policyholder liabilities and shareholders’ equity. Our investment portfolio consists primarily of fixed maturity securities. These securities are issued by both domestic and foreign entities and are backed either by collateral or the credit of the underlying issuer. Factors such as an economic downturn or political change in the country of the issuer, a regulatory change pertaining to the issuer’s industry, a significant deterioration in the cash flows of the issuer, unforeseen accounting irregularities or fraud committed by the issuer, widening risk spreads, ratings downgrades, a change in the issuer’s marketplace or business prospects, or other events that adversely affect the issuers of these securities may result in the issuer defaulting on its obligations. Our investment portfolio also includes perpetual debentures, or “hybrid” securities. Interest on these securities due on any payment date may be deferred by the issuer. Because interest payments are deferrable and because these securities rank behind traditional debt obligations, events that adversely affect the issuers of these securities may have a greater adverse effect on these types of investments than on our traditional fixed maturity securities.

Our mortgage loan portfolio has default risk. Events or developments, such as economic conditions that impact the ability of tenants to pay their rents or limit the availability of refinancing, may have a negative effect on our mortgage loan portfolio. Events or developments that have a negative effect on any particular geographic region or sector may have a greater adverse effect on an investment portfolio to the extent that the portfolio is concentrated in that region or sector.

A default results in the recognition of an other-than-temporary impairment loss on the investment. A default may also adversely affect our ability to collect principal and interest due to us. The probability of credit downgrades and defaults increases when the fixed income markets experience periods of volatility and illiquidity.

Our exposure to credit spreads, which is the yield above comparable Treasury securities, primarily relates to market price and cash flow variability associated with changes in credit spreads. A widening of credit spreads may increase

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the net unrealized loss position of the investment portfolio. Credit spread tightening may reduce net investment income associated with new purchases of fixed income securities.

We use derivative instruments to help us manage interest rate risk. Risks to our results of operations, financial condition, or liquidity include:

We report our fixed maturity securities and certain other financial instruments at market value. Valuations may include inputs and assumptions that are less observable or require greater estimation, particularly during periods of market disruption, resulting in values which may be less than the value at which the investments may ultimately be sold. Further, rapidly changing and unprecedented credit and equity market conditions could materially impact the valuation of securities as reported in our financial statements, and the period to period changes in value could vary significantly. Decreases in value may have a material adverse effect on our results of operations or financial condition.

We evaluate our investment portfolio for impairments. There can be no assurance that we have accurately assessed the level of impairments taken. Additional impairments may need to be taken in the future, and historical trends may not be indicative of future impairments. Any event reducing the value of our securities other than on a temporary basis may have a material adverse effect on our business, results of operations, or financial condition.

While we attempt to match our asset cash flows and durations with expected liability cash flows and durations to meet the funding requirements of our business, we may in certain circumstances need to sell investments due to changes in regulatory or capital requirements, changes in tax laws, rating agency decisions, and/or unexpected changes in liquidity needs. Events such as these may force us to sell securities in an unfavorable interest rate or credit environment, with a resulting adverse effect on our results of operations, financial condition, or liquidity.

See “Critical Accounting Estimates” included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 and Notes 1, 2, 3, and 4 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for further discussion of our investments and derivatives.

Competition may adversely affect our market share or profitability.

All of our businesses are highly competitive. We believe that the principal competitive factors affecting our business are integrated product choices, price, quality of customer service and claims management, financial strength, and claims-paying ratings. We compete for new product sales, the retention of existing business, and the ability to attract and retain independent agents and brokers to market our products, all of which affect our profitability. The level and intensity of competition may grow due to existing competitors becoming more aggressive, new competitors entering the market, and an increase in merger and acquisition activity which may result

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in larger competitors with greater financial resources. There are many insurance companies which actively compete with us in our lines of business, and there is no assurance that we will be able to compete effectively against these companies and new competitors in the future. See “Competition” contained herein in Item 1 for further discussion.

Changes in accounting standards issued by the Financial Accounting Standards Board (FASB), the International Accounting Standards Board (IASB), the U.K. Accounting Standards Board (ASB), or other standard-setting bodies may adversely affect our financial statements.

Our financial statements are subject to the application of generally accepted accounting principles in both the United States and the United Kingdom, which are periodically revised and/or expanded. Accordingly, we are required to adopt new or revised accounting standards issued by recognized authoritative bodies, including the FASB and ASB. The FASB has several ongoing projects regarding accounting standards that will likely be adopted in the near future. It is expected that the United Kingdom will adopt International Financial Reporting Standards (IFRS) issued by the IASB in the near future. It is possible that the United States may also adopt IFRS. Future accounting standards we adopt will change current accounting and disclosure requirements applicable to our financial statements. Such changes may have a material effect on our reported results of operations or financial condition.

A decrease in our financial strength or issuer credit ratings may have an adverse effect on our competitive position, results of operations, or financial condition.

We compete based in part on the financial strength ratings provided by rating agencies. A downgrade of our financial strength ratings may adversely affect us and could potentially, among other things, adversely affect relationships with distributors of our products and services and retention of our sales force, negatively impact persistency and new sales, and generally adversely affect our ability to compete. A downgrade in the issuer credit rating assigned to Unum Group or a negative outlook statement by a rating agency could have an effect on our ability to raise capital and on our cost of capital. See “Ratings” contained herein in Item 1 and in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 for further discussion.

Events that damage our reputation may adversely affect our business, results of operations, or financial condition.

There are many events which may harm our reputation. These events could include but are not limited to those discussed herein in Item 1A regarding regulatory investigations concerning one or more aspects of broker compensation and related matters, as well as legal proceedings which have previously and may in the future result in court rulings and jury verdicts against us. Our reliance on independent contractors and brokers to distribute many of our products exposes our reputation to the possibility of being damaged by sales practices over which we have no means of direct control. Depending on the severity of the damage to our reputation, we may be unable to effectively compete for new products or retain our existing business. Damage to our reputation may also hinder our ability to raise new capital or increase our cost of capital. See “Regulation” contained herein in Item 1 and Note 13 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for additional information on regulatory matters and legal proceedings.

Volatility in long-term interest rates or the rate of return on pension plan assets may have a negative effect on the funded status of our pension plans and/or increase our pension costs.

The rate of return on pension plan assets is determined based on the fair value of the plan assets at the beginning and end of the measurement period. Declines in long-term interest rates or the fair value of our plan assets may result in a decrease in the funded status of our pension plans and/or increased pension costs, which may adversely affect our results of operations, financial condition, or liquidity. Conversely, a rise in interest rates could unfavorably impact the fair value of both the fixed income and equity investments in our pension plans. See “Critical Accounting Estimates” included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 and Note 8 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for further discussion.

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Our insurance products may be affected by many factors, and changes in any of those factors may materially affect our profitability.

Disability insurance may be affected by a number of social, economic, governmental, competitive, and other factors. Changes in societal attitudes, such as work ethic, motivation, or stability, can significantly affect the demand for and underwriting results from disability products. Competition in disability insurance has also been markedly affected by the growth of social security, workers’ compensation, and other governmental programs in the workplace.

Both economic and societal factors can affect claim incidence for disability insurance. Claim incidence and claim recovery rates may be influenced by, among other factors, the rate of unemployment and consumer confidence. Claim incidence and claim recovery rates may also be influenced by the emergence of new infectious diseases or illnesses. The relationship between these and other factors and overall incidence is very complex and will vary due to contract design features and the degree of expertise within the insuring organization to price, underwrite, and adjudicate the claims. Within the group disability market, pricing and renewal actions can be taken to react to higher claim rates. However, these actions take time to implement, and there is a risk that the market will not sustain increased prices. In addition, changes in economic and external conditions may not manifest themselves in claims experience for an extended period of time.

The pricing actions available in the individual disability market differ between product classes. Our individual noncancelable disability policies, in which the policy is guaranteed to be renewable through the life of the policy at a fixed premium, do not permit us to adjust premiums on our in-force business due to changes resulting from economic, societal, or other factors. Guaranteed renewable contracts that are not noncancelable can be re-priced to reflect adverse experience, but rate changes cannot be implemented as quickly as in the group disability market.

Long-term care insurance can be affected by a number of demographic, medical, economic, governmental, competitive, and other factors. Because long-term care insurance is a relatively new product for the insurance industry and is long-duration in nature, there is not as much historical data as is available for our other products. This creates a level of uncertainty in properly pricing the product and using appropriate assumptions when establishing reserves. Long-term care insurance is guaranteed renewable and can be re-priced to reflect adverse experience, but the re-pricing is subject to regulatory approval which can affect the length of time in which the re-pricing can be implemented, if at all. We monitor our own experience and industry studies concerning morbidity, mortality, and policyholder terminations to understand emerging trends. Changes in actual experience relative to our expectations may adversely affect our profitability and reserves. Mortality continues to improve for the general population, and life expectancy has increased, which could lengthen the time a claimant receives long-term disability and long-term care benefits. Due to the long duration of the product, we may be unable to purchase appropriate assets with cash flows and durations such that the timing and/or amount of our investment cash flows may not match those of our maturing liabilities. Sustained periods of low interest rates could result in lower than expected profitability or increases in reserves. In 2010, legislation related to healthcare reform was signed into law. Among other things, the new legislation includes the Community Living Assistance Services and Support Act (CLASS Act) which creates a nationwide voluntary long-term services insurance program. Details of the insurance program are still emerging, but the program is scheduled to begin taking effect in 2011, with enrollment expected to begin after benefits are set in late 2012. While we continue to monitor the impact of the CLASS Act on our company and the insurance industry as further details of the government program become available, it is possible that the program provided under the provisions of the CLASS Act may adversely affect the demand for and profitability of our long-term care products.

Group life insurance may be affected by the characteristics of the employees insured, the amount of insurance employees may elect voluntarily, our risk selection process, our ability to retain employer groups with favorable risk characteristics, the geographical concentration of employees, and mortality rates. Claim incidence may also be influenced by unexpected catastrophic events such as terrorist attacks and natural disasters, which may also affect the availability of reinsurance coverage. There are a series of lawsuits pending in federal courts challenging the use of retained asset accounts in group life plans that are governed by ERISA. If these challenges are upheld by the courts, our ability to use such accounts for the beneficiaries of these plans may be adversely affected.

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Voluntary products sold in the workplace may be affected by the characteristics of the employees insured, the level of employee participation and the amount of insurance the employees elect, our risk selection process, and our ability to retain employer groups with favorable risk characteristics. Our voluntary life insurance products generally include interest-sensitive forms of insurance which contain a guaranteed minimum interest crediting rate. It is possible that our investment returns could be lower than the guaranteed crediting rate. The non-life contracts are guaranteed renewable and can be repriced to reflect adverse experience, but rate changes cannot be implemented as quickly as for group disability and group life products.

An assessment by a governing tax authority may have a material adverse effect on our results of operations or financial condition.

The calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax laws in a multitude of jurisdictions, both domestic and foreign. The amount of income taxes we pay is subject to ongoing audits in various jurisdictions, and a material assessment by a governing tax authority could affect profitability. Such an assessment may have a material adverse effect on our results of operations or financial condition.

We may be required to establish a valuation allowance against our deferred income tax asset.

Factors in our ability to realize a tax benefit from our deferred income tax asset include the performance of our businesses and our ability to generate realized investment gains. If we determine that all or a portion of the deferred income tax asset will not result in a future tax benefit, a valuation allowance must be established with a corresponding charge to net income or other comprehensive income. Such charges may have a material adverse effect on our results of operations or financial condition. The likelihood of recording such a valuation increases during periods of economic downturn.

Our overall risk management program may leave us exposed to unidentified or unanticipated risk, which could negatively affect our business.

We have devoted significant resources to develop our enterprise risk management program, which has the objective of managing our strategic, market, credit, insurance, operations, capital and liquidity, and reputational risks. However, our program may not be comprehensive, and our methods for managing risk may not fully predict future exposures. See “Quantitative and Qualitative Disclosures About Market Risk” contained herein in Item 7A for further information about our risk management program.

Litigation is common in our businesses and may result in significant financial losses and/or harm to our reputation.

Unum Group and/or its subsidiaries’ directors and officers have been sued in several lawsuits. The outcome of these lawsuits is uncertain. An estimated loss is accrued when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. An adverse outcome in one or more of these actions may, depending on the nature, scope and amount of the ruling, adversely affect our results of operations or financial condition, encourage other litigation, and limit our ability to write new business, particularly if the adverse outcomes negatively impact certain of our ratings.

Unum Group and its insurance subsidiaries, as part of their normal operations in managing claims, are engaged in claim litigation where disputes arise as a result of a denial or termination of benefits. Typically those lawsuits are filed on behalf of a single claimant or policyholder, and in some of these individual actions punitive damages are sought, such as claims alleging bad faith in the handling of insurance claims. For our general claim litigation, we maintain reserves based on experience to satisfy judgments and settlements in the normal course. We expect that the ultimate liability, if any, with respect to general claim litigation, after consideration of the reserves maintained, will not be material to our financial condition. Nevertheless, given the inherent unpredictability of litigation, it is possible that an adverse outcome in certain claim litigation involving punitive damages may, from time to time, have a material adverse effect on our results of operations. We are unable to estimate a range of reasonably possible punitive losses.

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Refer to Note 13 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for additional information on legal proceedings.

United Kingdom currency translation risk could materially impact reported operating results.

The functional currency of our U.K. operations is the British pound sterling. Fluctuations in the pound to dollar exchange rate have an effect on our financial results. In periods when the pound weakens, translating pounds into dollars decreases current period results relative to the prior period. In periods when the pound strengthens, translating pounds into dollars increases current period results in relation to the prior period. However, it is important to distinguish between translating and converting foreign currency. Except for a limited number of transactions, we do not actually convert pounds into dollars. As a result, we view foreign currency translation as a financial reporting item and not a reflection of operations or profitability in the U.K.

We are subject to various operational risks resulting from inadequate or failed internal processes or from external events which may damage our market position and reputation and/or adversely affect our results of operations or financial condition.

We face challenges and risks associated with the development, sale, and retention of product offerings that meet the needs of our targeted markets; maintaining effective underwriting and pricing discipline; continued effective claim management and customer service performance; ongoing expense management; delivering effective technology solutions; continued execution of our capital management strategy; and the successful implementation of operational improvements and strategic growth initiatives. Failure to successfully manage our operational risks may adversely affect our competitiveness, profitability, or financial condition.

Our ability to finance our ongoing operations may not always be possible solely from internal sources of capital and liquidity. If we need to seek external capital, there is the risk that adverse market conditions may significantly affect our access to capital or our cost of capital.

A change in demand for our insurance products or an increase in the incidence of new claims or the duration of existing claims could negatively impact our cash flows from operations. Deterioration in the credit market, which could delay our ability to sell our positions in certain of our fixed maturity securities in a timely manner, could also negatively impact our cash flows. Without sufficient liquidity, we could be forced to curtail our operations, and our business may suffer. If our internal sources of liquidity prove to be insufficient, we may be unable to successfully obtain additional financing and capital on favorable terms, or at all, which may adversely affect us.

In the near term, we expect that our need for external financing is small, but changes in our business could increase our need. If our financial results are unfavorable, we may need to increase our capital in order to maintain our credit ratings or satisfy regulatory requirements. Maintaining appropriate levels of statutory surplus, as measured by state insurance regulations, is considered important by state insurance regulatory authorities and the rating agencies that rate insurers’ claims-paying abilities and financial strength. Failure to maintain certain levels of statutory surplus could result in increased regulatory scrutiny, action by state regulatory authorities, or a downgrade by the rating agencies. Regulatory changes such as those discussed herein in Item 1A may impose higher capital requirements on our insurance subsidiaries. Need for additional capital may limit a subsidiary’s ability to distribute funds to the holding company and adversely affect our ability to pay dividends on our common stock and meet our debt and other payment obligations.

Obtaining financing for even a small amount of capital could be complicated in unfavorable market conditions and during periods of economic uncertainty. The markets may exert downward pressure on availability of liquidity and credit capacity for certain issuers. The availability of financing will depend on a variety of factors such as market conditions, the general availability of credit, the overall availability of credit to the financial services industry, our credit ratings and credit capacity, and the possibility that customers or lenders could develop a negative perception of our financial prospects. Similarly, our access to funds may be impaired if regulatory authorities or rating agencies take negative actions against us. Raising capital in unfavorable market conditions could increase our interest expense or negatively impact our shareholders through increased dilution of their common stock holding in Unum Group.

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See “Liquidity and Capital Resources” included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 for further discussion.

Our subsidiaries may be restricted from paying dividends to our holding companies.

Unum Group and certain of its subsidiaries rely on dividends from our insurance and non-insurance company subsidiaries to make dividend payments on our common stock, meet debt payment obligations, and pay our other obligations. Our insurance company subsidiaries are subject to regulatory limitations on the payment of dividends and on other transfers of funds to affiliates. The level of statutory earnings and capital in our insurance subsidiaries could impact their ability to pay dividends or to make other transfers of funds to our holding companies, which could impair our ability to pay our dividends or meet our debt and other payment obligations. See “Liquidity and Capital Resources” included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 and Note 14 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for a discussion of the existing regulatory limitations on dividends.

Reinsurance may not be available or affordable, or reinsurers may be unwilling or unable to meet their obligations under our reinsurance contracts, which may adversely affect our results of operations or financial condition.

As part of our overall risk management strategy, we purchase reinsurance for certain risks underwritten by our various businesses. Market conditions beyond our control determine the availability and cost of the reinsurance protection. Any decrease in the amount of reinsurance will increase our risk of loss and any increase in the cost of reinsurance will, absent a decrease in the amount of reinsurance, reduce our results of operations. Accordingly, we may be forced to incur additional expenses for reinsurance or may be unable to obtain sufficient reinsurance on acceptable terms, which may adversely affect our ability to write future business or result in the assumption of more risk with respect to the policies we issue. The collectibility of our reinsurance recoverable is primarily a function of the solvency of the individual reinsurers. We cannot provide assurance that our reinsurers will pay the reinsurance recoverables owed to us or that they will pay these recoverables on a timely basis. The insolvency of a reinsurer or the inability or unwillingness of a reinsurer to comply with the terms of a reinsurance contract may have an adverse effect on our results of operations or financial condition.

We have intangible assets such as deferred acquisition costs (DAC), value of business acquired (VOBA), and goodwill. We may be required to accelerate amortization or recognize an impairment, which may adversely affect our results of operations or financial condition.

We defer certain costs incurred in acquiring new business and expense these costs over the life of the related policies. These costs include certain commissions, other agency compensation, selection and policy issue expenses, and field expenses. VOBA represents the present value of future profits recorded in connection with the acquisition of a block of insurance policies. DAC and VOBA are amortized based primarily upon expected future premium income of the related insurance policies. Recoverability testing for DAC and VOBA is performed on an annual basis. Insurance contracts are grouped on a basis consistent with our manner of acquiring, servicing, and measuring profitability of the contracts. If recoverability testing indicates that either DAC and/or VOBA are not recoverable, the deficiency is charged to expense. Accounting standard updates which we will be required to adopt in our first quarter 2012 filing will result in a decrease to our existing DAC asset if we choose retrospective application on adoption. See “Critical Accounting Estimates” included in Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained herein in Item 7 and Note 1 of the “Notes to Consolidated Financial Statements” contained herein in Item 8.

Goodwill is not amortized, but on an annual basis we review the carrying amount of goodwill for indications of impairment, considering in that review the financial performance and other relevant factors. In accordance with accounting guidance, we test for impairment at either the operating segment level or one level below. In addition, certain events including, but not limited to, a significant adverse change in legal factors or the business environment, an adverse action by a regulator or rating agency, or unanticipated competition would cause us to review goodwill for impairment more frequently than annually.

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Extreme events, including political instability or terrorism, can affect the economy in general, our industry, and us specifically.

Events such as epidemics, pandemics, political instability, terrorist attacks, natural disasters, or other extreme events may materially adversely affect our business, the level of claims, or our results of operations, and in the event of extreme circumstances, our financial condition or viability. Beyond obtaining insurance coverage for our facilities, there are few, if any, commercial options through which to transfer the exposure from extreme events away from us. The continued threat of terrorism could result in increased reinsurance prices and reduced insurance coverage and potentially cause us to retain more risk than we otherwise would retain if we were able to obtain reinsurance at lower prices. In the event of nuclear or bioterrorism attacks, epidemics, or other extreme events, we could face significant costs depending on the government’s actions and the responsiveness of public agencies and other insurers. In addition, we may also be adversely affected if we do not maintain adequate procedures to ensure disaster recovery and business continuity for our facilities and operations in the event of such occurrences.

We also face other risks that may adversely affect our business, results of operations, or financial condition, including but not limited to:

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ITEM 1B. UNRESOLVED STAFF COMMENTS

None

ITEM 2. PROPERTIES

We occupy approximately 2.6 million square feet of space at four principal United States operating centers in Chattanooga, Tennessee; Portland, Maine; Worcester, Massachusetts; and Columbia, South Carolina.

We own and occupy two connected buildings in Chattanooga, Tennessee, with approximately 861,000 square feet of office space. We own and occupy five facilities in Portland, Maine, with approximately 838,000 square feet of office space. We own and occupy facilities totaling approximately 378,000 square feet in Worcester, Massachusetts. We lease and occupy approximately 53,300 square feet of office space in Glendale, California. These properties are used primarily for operations supporting Unum US, Individual Disability – Closed Block, and Corporate and Other.

We own and occupy approximately 523,000 square feet of office space in Columbia, South Carolina, used primarily for operations supporting Colonial Life.

We also occupy office buildings in the United Kingdom which serve as the home offices of Unum UK. We own and occupy property located in Dorking, with approximately 63,000 square feet of office space. In addition, approximately 65,000 square feet of office space is leased and occupied in two office buildings located in Bristol and Basingstoke.

Additionally, we lease other office space, for periods principally from five to ten years, for use by our affiliates and sales forces.

Our properties and facilities are suitable and adequate for current operations.

ITEM 3. LEGAL PROCEEDINGS

Refer to Note 13 of the “Notes to Consolidated Financial Statements” contained herein in Item 8 for information on legal proceedings.

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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Common stock of Unum Group is traded on the New York Stock Exchange. The stock symbol is “UNM.” Quarterly market prices and dividends declared and paid per share of common stock are as follows:

The following graph shows a five year comparison of cumulative total returns for our common stock’s historical performance, the S&P 500 Index, and the Insurance Index (non-weighted average of “total returns” from the S&P Life & Health Index and the S&P Multi-line Index). Past performance is not an indication of future results.

As of February 18, 2011, there were 14,084 registered holders of common stock.

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The following table provides information about our share repurchase activity for the fourth quarter of 2010:

Our board of directors has the authority to declare cash dividends on shares of common stock. In determining dividends, the board takes into account a number of factors including our financial condition and results of operations, regulatory limitations on the payment of dividends from subsidiaries, cash requirements, general economic conditions, and other factors the board may deem relevant. For information on restrictions relating to our subsidiaries’ ability to pay dividends to Unum Group and certain of its intermediate holding company subsidiaries, see “Liquidity and Capital Resources – Cash Available from Subsidiaries” contained herein in Item 7 and Note 14 of the “Notes to Consolidated Financial Statements” contained herein in Item 8. For information relating to compensation plans under which Unum Group’s equity securities are authorized for issuance, see Item 12 contained herein.

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ITEM 6. SELECTED FINANCIAL DATA

(in millions of dollars, except share data)

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⁽¹⁾ Included are regulatory claim reassessment charges of $65.8 million and $396.4 million in 2007 and 2006, respectively.

⁽²⁾ Included are costs related to early retirement of debt of $0.4 million, $58.8 million, and $25.8 million in 2008, 2007, and 2006, respectively.

⁽³⁾ Includes the net increase in deferred acquisition costs, compensation expense, and other expenses. Included in these expenses are regulatory claim reassessment charges (credits) and broker compensation settlement expenses of $(12.8) million and $33.5 million in 2007 and 2006, respectively.

⁽⁴⁾ Amount reported for 2006 includes an income tax benefit of $91.9 million primarily as the result of group relief benefits obtained from the use of net operating losses in a foreign jurisdiction in which our businesses operate.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The discussion and analysis presented in this section should be read in conjunction with the “Cautionary Statement Regarding Forward-Looking Statements” included below the Table of Contents, “Risk Factors” included in Item 1A, “Selected Financial Data” included in Item 6, and the Consolidated Financial Statements and notes thereto included in Item 8.

Executive Summary

During 2010, our focus remained on disciplined top-line growth and capital management. Objectives for the year included:

A discussion of our operating performance and capital management follows.

2010 Operating Performance and Capital Management

For 2010 we reported net income per share, assuming dilution, of $2.71 compared to $2.57 in 2009. After-tax operating income was $2.69 per share compared to $2.57 per share in 2009. Our operating revenue by segment increased 0.9 percent over 2009, with the current economic environment continuing to negatively impact our premium growth. Operating income by segment increased 2.0 percent over 2009, with solid performance in many of our product lines. See “Reconciliation of Non-GAAP Financial Measures” contained herein in Item 7.

Our Unum US segment reported an increase in segment operating income of 6.6 percent in 2010 compared to 2009, with the overall risk experience across our product lines remaining generally stable. The benefit ratio for the Unum US segment for 2010 was 79.3 percent compared to 79.1 percent in 2009, with year over year improvement in benefit ratios for group disability and voluntary benefits slightly offset by the higher benefit ratio in the individual disability – recently issued and long-term care product lines. Unum US premium income decreased slightly in 2010 compared to 2009. Similar to 2009, the ongoing high levels of unemployment and the competitive environment continued to pressure our sales and premium income growth. In particular, premium growth from existing customers continued to be unfavorably impacted by lower salary growth and lower growth in the number of employees covered under an existing policy. Partially offsetting this unfavorable impact on premium growth was higher persistency. Unum US sales, which were also negatively impacted by the economy and the competitive environment, decreased 5.7 percent in 2010 compared to 2009. Our group core market segment, which we define for Unum US as employee groups with fewer than 2,000 lives, reported a sales decline of 8.3 percent in 2010 relative to 2009. Sales in the group large case market segment in 2010 declined 19.8 percent compared to 2009. Sales of voluntary benefits increased 15.6 percent in 2010 compared to 2009. Persistency for all product lines remains high relative to historical levels.

Our Unum UK segment reported a decrease in segment operating income of 15.8 percent in 2010, as measured in Unum UK’s local currency, relative to last year. The decrease was driven by a decline in premium income as well as less favorable risk results. The decline in premium income resulted from lower premium growth from existing customers and pricing actions due to the competitive U.K. market. The benefit ratio for Unum UK was 67.0 percent in 2010 compared to 54.5 percent in 2009, driven primarily by lower premium income, the impact of higher inflation on claim reserves associated with group long-term disability policies containing an inflation-linked benefit increase feature, and unfavorable claim experience in group life. Overall sales in Unum UK were generally consistent with the prior year, with a decline of 0.9 percent in 2010, as measured in Unum UK’s local currency. Negatively affecting year over year comparisons is an increase in 2009 sales which resulted from the exit of another large insurance provider from the U.K. group risk market. Persistency generally improved over the levels of last year.

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Our Colonial Life segment reported a slight increase in segment operating income of 0.5 percent in 2010 relative to 2009, with premium growth of 6.0 percent relative to last year. Risk results were less favorable than last year, with a benefit ratio of 49.7 percent in 2010 compared to 47.3 percent in 2009, driven primarily by unfavorable experience in the accident, sickness, and disability product line. Colonial Life’s sales increased 4.4 percent relative to 2009. The number of new accounts and new agent contracts both increased relative to the prior year, while the average new case size declined. Persistency continues to remain strong and is slightly higher than the levels of 2009.

Our investment portfolio continued to perform well, with an increase in net investment income of 6.3 percent over 2009. The net unrealized gain on our fixed maturity securities was $3.5 billion at the end of 2010, compared to a gain of $2.0 billion at year end 2009.

We believe our capital and financial positions are strong. At the end of 2010, the risk-based capital ratio for our traditional U.S. insurance subsidiaries, calculated on a weighted average basis using the NAIC Company Action Level formula, was approximately 398 percent, compared to 382 percent at the end of 2009. Our leverage ratio, when calculated using consolidated debt to total consolidated capital, was 25.9 percent at December 31, 2010 compared to 24.8 percent at December 31, 2009, reflecting the issuance of $400.0 million of senior notes during the third quarter of 2010. Our leverage ratio, when calculated excluding the non-recourse debt and associated capital of Tailwind Holdings, LLC (Tailwind Holdings) and Northwind Holdings, LLC (Northwind Holdings), was 22.8 percent at December 31, 2010 compared to 20.5 percent at the end of 2009. The cash and marketable securities at our holding companies equaled approximately $1.2 billion at the end 2010, compared to $915 million at the end of 2009. During 2010, we repurchased 16.4 million shares of Unum Group’s common stock under our $500.0 million share repurchase program, at a cost of approximately $356.0 million. In February 2011, our board of directors authorized the repurchase of up to $1.0 billion of Unum Group’s common stock over the next 18 months, in addition to the amount remaining to be repurchased under the $500.0 million program.

Despite the difficult economic environment, we continue to make steady and disciplined progress, executing on our business plans and strengthening our financial position. We remain cautious of the near-term outlook for employment levels and wages, both of which limit opportunities for premium growth, but we believe we are poised to profitably grow as employment trends improve.

Further discussion is included in “Segment Results,” “Investments,” and “Liquidity and Capital Resources” contained in this Item 7.

Outlook for 2011

During 2011, our focus will remain on disciplined top-line growth and capital management. Objectives for the year include:

Critical Accounting Estimates

We prepare our financial statements in accordance with GAAP. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in our financial statements and accompanying notes. The accounting estimates we deem to be most critical to our results of operations and balance sheets are those related to reserves for policy and contract benefits, deferred acquisition costs, valuation of investments, pension and postretirement benefit plans, income taxes, and contingent liabilities. Estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed in our financial statements.

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For additional information, refer to our significant accounting policies in Note 1 of the “Notes to Consolidated Financial Statements” contained herein in Item 8.

Reserves for Policy and Contract Benefits

Our largest liabilities are reserves for claims that we estimate we will eventually pay to our policyholders. The two primary categories of reserves are policy reserves for claims not yet incurred and claim reserves for claims that have been incurred or are estimated to have been incurred but not yet reported to us. These reserves equaled $38.2 billion and $37.8 billion at December 31, 2010 and 2009, respectively, or approximately 78.9 percent and 82.3 percent of our total liabilities, respectively. Reserves ceded to reinsurers were $6.7 billion at both December 31, 2010 and 2009, and are reported as reinsurance recoverable in our consolidated balance sheets.

Policy Reserves

Policy reserves are established in the same period we issue a policy and equal the difference between projected future policy benefits and future premiums, allowing a margin for expenses and profit. These reserves relate primarily to our traditional non interest-sensitive products, including our individual disability, individual and group long-term care, and voluntary benefits products in our Unum US segment; individual disability products in our Unum UK segment; disability and cancer and critical illness policies in our Colonial Life segment; and, the Individual Disability – Closed Block segment products. The reserves are calculated based on assumptions that were appropriate at the date the policy was issued and are not subsequently modified unless the policy reserves become inadequate (i.e., loss recognition occurs).

In establishing policy reserves, we use assumptions that reflect our best estimate while considering the potential for adverse variances in actual future experience, which results in a total policy reserve balance that has an embedded reserve for adverse deviation. We do not, however, establish an explicit and separate reserve as a provision for adverse deviation from our assumptions.

We perform loss recognition tests on our policy reserves annually, or more frequently if appropriate, using best estimate assumptions as of the date of the test, without a provision for adverse deviation. We group the policy reserves for each major product line within a segment when we perform the loss recognition tests. If the policy reserves determined using these best estimate assumptions are higher than our existing policy reserves net of any deferred acquisition cost balance, the existing policy reserves are increased or deferred acquisition costs are reduced to immediately recognize the deficiency. Thereafter, the policy reserves for the product line are calculated using the same method we used for the loss recognition testing, referred to as the gross premium valuation method, wherein we use our best estimate as of the gross premium valuation (loss recognition) date rather than the initial policy issue date to determine the expected future claims, commissions, and expenses we will pay and the expected future gross premiums we will receive.

Because the key policy reserve assumptions for policy persistency, mortality and morbidity, and discount rates are all locked in at policy issuance based on assumptions appropriate at that time, policy reserve assumptions are not changed due to a change in claim status from active to disabled subsequent to policy issuance. Therefore, we maintain policy reserves for a policy for as long as the policy remains in-force, even after a separate claim reserve is established. Incidence rates in industry standard valuation tables for policy reserves have traditionally included all lives, active and disabled. In addition, the waiver of premium provision provides funding for the policy reserve while a policyholder is disabled. As a result, the funding mechanisms and the cost of claims are aligned and require a policy reserve to be held while on claim. In addition, most policies allow for multiple occurrences of claims, and a policy reserve is consequently still maintained at the time of claim to fund any potential future claims. The policy reserves build up and release over time based on assumptions made at the time of policy issuance such that the reserve is eliminated as policyholders reach the terminal age for coverage, die, or voluntarily lapse the policy.

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Policy reserves for Unum US, Unum UK, and Colonial Life products, which at December 31, 2010 represented approximately 40.0 percent, 0.2 percent, and 9.5 percent, respectively, of our total gross policy reserves, are determined using the net level premium method as prescribed by GAAP. In applying this method, we use, as applicable by product type, morbidity and mortality incidence rate assumptions, claim resolution rate assumptions, and policy persistency assumptions, among others, to determine our expected future claim payments and expected future premium income. We then apply an interest, or discount, rate to determine the present value of the expected future claims and claim expenses we will pay and the expected future premiums we will receive, with a provision for profit allowed.

Policy reserves for our Individual Disability – Closed Block segment, which at December 31, 2010 represented approximately 9.0 percent of our total gross policy reserves, are determined using the gross premium valuation method based on assumptions established as of January 1, 2004, the date of loss recognition. Key assumptions are policy persistency, claim incidence, claim resolution rates, commission rates, and maintenance expense rates. We then apply an interest, or discount, rate to determine the present value of the expected future claims, commissions, and expenses we will pay as well as the expected future premiums we will receive, with no provision for future profit. The interest rate is based on our expected net investment returns on the investment portfolio supporting the reserves for this segment. Under the gross premium valuation method, we do not include an embedded provision for the risk of adverse deviation from these assumptions. Gross premium valuation assumptions do not change after the date of loss recognition unless reserves are again determined to be deficient. We perform loss recognition tests on the policy reserves for this block of business quarterly.

The Corporate and Other segment includes certain products no longer actively marketed, the majority of which have been reinsured. Policy reserves for this segment represent $5.7 billion on a gross basis, or approximately 41.3 percent, of our total policy reserves. We have ceded $4.4 billion of the related policy reserves to reinsurers. The ceded reserve balance is reported in our consolidated balance sheets as a reinsurance recoverable. We continue to service a block of group pension products, which we have not ceded, and the policy reserves for these products are based on expected mortality rates and retirement rates. Expected future payments are discounted at interest rates reflecting the anticipated investment returns for the assets supporting the liabilities.

Claim Reserves

Claim reserves are established when a claim is incurred or is estimated to have been incurred but not yet reported (IBNR) to us and, as prescribed by GAAP, equals our long-term best estimate of the present value of the liability for future claim payments and claim adjustment expenses. A claim reserve is based on actual known facts regarding the claim, such as the benefits available under the applicable policy, the covered benefit period, and the age and occupation of the claimant, as well as assumptions derived from our actual historical experience and expected future changes in experience for factors such as the claim duration and discount rate. Reserves for IBNR claims, similar to incurred claim reserves, include our assumptions for claim duration and discount rates but because we do not yet know the facts regarding the specific claims, are also based on historical incidence rate assumptions, including claim reporting patterns, the average cost of claims, and the expected volumes of incurred claims. Our incurred claim reserves and IBNR claim reserves do not include any provision for the risk of adverse deviation from our assumptions.

Claim reserves, unlike policy reserves, are subject to revision as current claim experience and projections of future factors affecting claim experience change. Each quarter we review our emerging experience to ensure that our claim reserves are appropriate. If we believe, based on our actual experience and our view of future events, that our long-term assumptions need to be modified, we adjust our reserves accordingly with a charge or credit to our current period income.

Multiple estimation methods exist to establish claim reserve liabilities, with each method having its own advantages and disadvantages. Available reserving methods utilized to calculate claim reserves include the tabular reserve method, the paid development method, the incurred loss development method, the count and severity method, and the expected claim cost method. No single method is better than the others in all situations and for all product lines. The estimation methods we have chosen are those that we believe produce the most reliable reserves.

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Claim reserves supporting our Unum US group and individual disability and group and individual long-term care lines of business and our Individual Disability – Closed Block segment represent approximately 39.5 percent and 43.7 percent, respectively, of our total claim reserves at December 31, 2010. We use a tabular reserve methodology for group and individual long-term disability and group and individual long-term care claims that have been reported. Under the tabular reserve methodology, reserves for reported claims are based on certain characteristics of the actual reported claimants, such as age, length of time disabled, and medical diagnosis. We believe the tabular reserve method is the most accurate to calculate long-term liabilities and allows us to use the most available known facts about each claim. IBNR claim reserves for our long-term products are calculated using the count and severity method using historical patterns of the claims to be reported and the associated claim costs. For group short-term disability products, an estimate of the value of future payments to be made on claims already submitted, as well as IBNR claims, is determined in aggregate rather than on the individual claimant basis that we use for our long-term products, using historical patterns of claim incidence as well as historical patterns of aggregate claim resolution rates. The average length of time between the event triggering a claim under a policy and the final resolution of those claims is much shorter for these products than for our long-term liabilities and results in less estimation variability.

Claim reserves supporting the Unum US group life and accidental death and dismemberment products represent approximately 3.8 percent of our total claim reserves at December 31, 2010. Claim reserves for these products are related primarily to death claims reported but not yet paid, IBNR death claims, and a liability for waiver of premium benefits. The death claim reserve is based on the actual face amount to be paid, the IBNR reserve is calculated using the count and severity method, and the waiver of premium benefits reserve is calculated using the tabular reserve methodology.

Claim reserves supporting our Unum UK segment represent approximately 9.0 percent of our total claim reserves at December 31, 2010, and are calculated using generally the same methodology that we use for Unum US disability and group life reserves. The assumptions used in calculating claim reserves for this line of business are based on standard United Kingdom industry experience, adjusted for Unum UK’s own experience.

The majority of the Colonial Life segment lines of business have short-term benefits, which generally have less estimation variability than our long-term products because of the shorter claim payout period. Our claim reserves for Colonial Life’s lines of business, which approximate 1.3 percent of our total claim reserves at December 31, 2010, are predominantly determined using the incurred loss development method based on our own experience. The incurred loss development method uses the historical patterns of payments by loss date to predict future claim payments for each loss date. Where the incurred loss development method may not be appropriate, we estimate the incurred claims using an expected claim cost per policy or other measure of exposure. The key assumptions for claim reserves for the Colonial Life lines of business are: (1) the timing, rate, and amount of estimated future claim payments; and (2) the estimated expenses associated with the payment of claims.

The following table displays policy reserves, incurred claim reserves, and IBNR claim reserves by major product line, with the summation of the policy reserves and claim reserves shown both gross and net of the associated reinsurance recoverable. Incurred claim reserves represent reserves determined for each incurred claim and also include estimated amounts for litigation expenses and other expenses associated with the payment of the claims as well as provisions for claims which we estimate will be reopened for our long-term care products. IBNR claim reserves include provisions for incurred but not reported claims and a provision for reopened claims for our disability products. The IBNR and reopen claim reserves for our disability products are developed and maintained in aggregate based on historical monitoring that has only been on a combined basis.

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(in millions of dollars)

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Key Assumptions

The calculation of policy and claim reserves involves numerous assumptions, but the primary assumptions used to calculate reserves are (1) the discount rate, (2) the claim resolution rate, and (3) the claim incidence rate for policy reserves and IBNR claim reserves. Of these assumptions, our discount rate and claim resolution rate assumptions have historically had the most significant effects on our level of reserves because many of our product lines provide benefit payments over an extended period of time.

Establishing reserve assumptions is complex and involves many factors. Reserves, particularly for policies offering insurance coverage for long-term disabilities, are dependent on numerous assumptions other than just those presented in the preceding discussion. The impact of internal and external events, such as changes in claims management procedures, economic trends such as the rate of unemployment and the level of consumer confidence, the emergence of new diseases, new trends and developments in medical treatments, and legal trends and legislative changes, among other factors, will influence claim incidence and resolution rates. Reserve assumptions differ by product line and by policy type within a product line. Additionally, in any period and over time, our actual experience may have a positive or negative variance from our long-term assumptions, either singularly or collectively, and these variances may offset each other. We test the overall adequacy of our reserves using all assumptions and with a long-term view of our expected experience over the life of a block of business rather than test just one or a few assumptions independently that may be aberrant over a short period of time. Therefore it is not possible to bifurcate the assumptions to evaluate the sensitivity of a change in each assumption, but rather in the aggregate by product line. We have presented in the following section an overview of our trend analysis for key assumptions and the results of variability in our assumptions, in aggregate, for the reserves which we believe are reasonably possible to have a material impact on our future financial results if actual claims yield a materially different amount than what we currently expect and have reserved for, either favorable or unfavorable.

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Trends in Key Assumptions

Because our actual experience regarding persistency and claim incidence has varied very little from our policy reserve and IBNR claim reserve assumptions, we have had minimal adjustments to our persistency assumptions and claim incidence assumptions during the years 2008 through 2010. Generally, we do not expect our mortality and morbidity claim incidence trends or our persistency trends to change significantly in the short-term, and to the extent that these trends do change, we expect those changes to be gradual over a longer period of time. However, we have historically experienced an increase in our group long-term disability morbidity claim incidence trends during and following a recessionary period, particularly in our Unum US operations. During 2010, claim incidence rates for Unum US group long-term disability were slightly elevated. Given the current economic conditions, it is possible that our claim incidence rates for this type of product may increase.

Throughout the period 2008 to 2010, actual new money interest rates varied with the changing market conditions, and the assumptions we used to discount our reserves generally trended downward slightly for all segments and product lines. Reserve discount rate assumptions for new policies and new claims have been adjusted to reflect our current and expected net investment returns. Changes in our average discount rate assumptions tend to occur gradually over a longer period of time because of the long-duration investment portfolio needed to support the reserves for the majority of our lines of business.

Both the mortality rate experience and the retirement rate experience for our block of group pension products have remained stable and consistent with expectations.

Claim resolution rates have a greater chance of significant variability in a shorter period of time than our other reserve assumptions. These rates are reviewed on a quarterly basis for the death and recovery components separately. Claim resolution rates in our Unum US segment group and individual long-term disability product lines and our Individual Disability – Closed Block segment have over the last several years exhibited some variability. Relative to the resolution rate we expect to experience over the life of the block of business, actual quarterly rates during 2009 and 2010 have varied by +3 and -4 percent in our Unum US group long-term disability line of business, between +10 and -12 percent in our Unum US individual disability – recently issued line of business, and between +5 and -3 percent in our Individual Disability – Closed Block segment.

Claim resolution rates are very sensitive to operational and environmental changes and can be volatile over short periods of time. Throughout the period 2008 to 2010, we had generally stable to improving claims management performance, and our claim resolution rates were fairly consistent with or slightly favorable to our long-term assumptions. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period, both favorably and unfavorably.

We monitor and test our reserves for adequacy relative to all of our assumptions in the aggregate. In our estimation, scenarios based on reasonably possible variations in each of our reserve assumptions, when modeled together in aggregate, could produce a potential result, either positive or negative, in our Unum US group disability line of business that would change our reserve balance by +/- 2.5 percent. Using our actual claim reserve balance at December 31, 2010, this variation would have resulted in an approximate change (either positive or negative) of $200 million to our claim reserves. Using the same sensitivity analysis approach for our Individual Disability – Closed Block segment, the claim reserve balance could potentially vary by +/- 2.6 percent of our reported balance, which at December 31, 2010, would have resulted in an approximate change (either positive or negative) of $260 million to our claim reserves. The major contributor to the variance for both the group long-term disability line of business and the Individual Disability – Closed Block segment is the claim resolution rate. We believe that these ranges provide a reasonable estimate of the possible changes in reserve balances for those product lines where we believe it is possible that variability in the assumptions, in the aggregate, could result in a material impact on our reserve levels, but we record our reserves based on our long-term best estimate. Because these product lines have long-term claim payout periods, there is a greater potential for significant variability in claim costs, either positive or negative.

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Deferred Acquisition Costs (DAC)

We defer certain costs incurred in acquiring new business and amortize (expense) these costs over the life of the related policies. Deferred costs include certain commissions, other agency compensation, selection and policy issue expenses, and field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from deferral.

Approximately 87.6 percent of our DAC relates to traditional non interest-sensitive products, and we amortize DAC in proportion to the premium income we expect to receive over the life of the policies. Key assumptions used in developing the future amortization of DAC are future persistency and future premium income. We use our own historical experience and expectation of the future performance of our businesses in determining the expected persistency and premium income. The estimated premium income in the early years of the amortization period is generally higher than in the later years due to the anticipated cumulative effect of policy persistency in the early years, which results in a greater proportion of the costs being amortized in the early years of the life of the policy. During 2010, our key assumptions used to develop the future amortization did not change materially from those used in 2009. Generally, we do not expect our persistency or interest rates to change significantly in the short-term, and to the extent that these trends do change, we expect those changes to be gradual over a longer period of time.

Presented below are our current assumptions regarding the length of our amortization periods, the approximate DAC balance that remains at the end of years 3, 10, and 15 as a percentage of the cost initially deferred, and our DAC balances as of December 31, 2010 and 2009.