TRAVELERS COMPANIES, INC. - Annual Report: 2015 (Form 10-K)

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TABLE OF CONTENTS
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS AND SCHEDULES

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

Commission file number 001-10898

The Travelers Companies, Inc.
(Exact name of registrant as specified in its charter)

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 ý No o

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 o No ý

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 ý No o

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

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.    o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Act (Check one):

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

As of June 30, 2015, the aggregate market value of the registrant's voting and non-voting common equity held by non-affiliates was $29,961,887,660.

As of February 5, 2016, 294,977,349 shares of the registrant's common stock (without par value) were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant's Proxy Statement relating to the 2016 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.

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The Travelers Companies, Inc.

Annual Report on Form 10-K

For Fiscal Year Ended December 31, 2015

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PART I

Item 1.    BUSINESS

        The Travelers Companies, Inc. (together with its consolidated subsidiaries, the Company) is a holding company principally engaged, through its subsidiaries, in providing a wide range of commercial and personal property and casualty insurance products and services to businesses, government units, associations and individuals. The Company is incorporated as a general business corporation under the laws of the state of Minnesota and is one of the oldest insurance organizations in the United States, dating back to 1853. The principal executive offices of the Company are located at 485 Lexington Avenue, New York, New York 10017, and its telephone number is (917) 778-6000. The Company also maintains executive offices in Hartford, Connecticut, and St. Paul, Minnesota. The term "TRV" in this document refers to The Travelers Companies, Inc., the parent holding company excluding subsidiaries.

        For a summary of the Company's revenues, operating income and total assets by reportable business segments, see note 2 of notes to the consolidated financial statements herein.

PROPERTY AND CASUALTY INSURANCE OPERATIONS

        The property and casualty insurance industry is highly competitive in the areas of price, service, product offerings, agent relationships and methods of distribution. Distribution methods include the use of independent agents, exclusive agents, direct marketing and/or salaried employees. According to A.M. Best, there are approximately 1,250 property and casualty groups in the United States, comprising approximately 2,700 property and casualty companies. Of those groups, the top 150 accounted for approximately 92% of the consolidated industry's total net written premiums in 2014. The Company competes with both foreign and domestic insurers. In addition, several property and casualty insurers writing commercial lines of business, including the Company, offer products for alternative forms of risk protection in addition to traditional insurance products. These products include large deductible programs and various forms of self-insurance, some of which utilize captive insurance companies and risk retention groups. The Company's competitive position in the marketplace is based on many factors, including the following:

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premiums charged;



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contract terms and conditions;



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products and services offered;



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claim service;



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agent, broker and client relationships;



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local presence;



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geographic scope of business;



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overall financial strength;



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ratings assigned by independent rating agencies;



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experience and qualifications of employees; and



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technology and information systems.

        In addition, the marketplace is affected by available capacity of the insurance industry, as measured by statutory capital and surplus, and the availability of reinsurance from both traditional sources, such as reinsurance companies, and non-traditional sources, such as hedge funds and pension plans. Industry capacity as measured by statutory capital and surplus expands and contracts primarily in conjunction with profit levels generated by the industry, less amounts returned to shareholders through

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dividends and share repurchases. Capital raised by debt and equity offerings may also increase statutory capital and surplus.

Pricing and Underwriting

        Pricing of the Company's property and casualty insurance products is generally developed based upon an estimation of expected losses, the expenses associated with producing, issuing and servicing business and managing claims, the time value of money related to the expected loss and expense cash flows, and a reasonable allowance for profit that considers the capital needed to support the Company's business. The Company has a disciplined approach to underwriting and risk management that emphasizes product returns and profitable growth over the long-term rather than premium volume or market share. The Company's insurance subsidiaries are subject to state laws and regulations regarding rate and policy form approvals. The applicable state laws and regulations establish standards in certain lines of business to ensure that rates are not excessive, inadequate, unfairly discriminatory, or used to engage in unfair price competition. The Company's ability to increase rates and the relative timing of the process are dependent upon each respective state's requirements, as well as the competitive market environment.

Geographic Distribution

        The following table shows the geographic distribution of the Company's consolidated direct written premiums for the year ended December 31, 2015:

Catastrophe Exposure

        The wide geographic distribution of the Company's property and casualty insurance operations exposes it to claims arising out of catastrophes. The Company uses various analyses and methods, including proprietary and third-party computer modeling processes, to continually monitor and analyze

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underwriting risks of business in natural catastrophe-prone areas and target risk areas for conventional terrorist attacks (defined as attacks other than nuclear, biological, chemical or radiological events). The Company relies, in part, upon these analyses to make underwriting decisions designed to manage its exposure on catastrophe-exposed business. For example, as a result of these analyses, the Company has limited the writing of new property and homeowners business in some markets and has selectively taken underwriting actions on new and existing business. These underwriting actions on new and existing business include tightened underwriting standards, selective price increases and changes to deductibles specific to hurricane-, tornado-, wind- and hail-prone areas. See "Item 7—Management's Discussion and Analysis of Financial Condition and Results of Operations—Catastrophe Modeling" and "—Changing Climate Conditions." The Company also utilizes reinsurance to manage its aggregate exposures to catastrophes. See "—Reinsurance."

BUSINESS AND INTERNATIONAL INSURANCE

        The Business and International Insurance segment offers a broad array of property and casualty insurance and insurance related services to its clients, primarily in the United States and in Canada, as well as in the United Kingdom, the Republic of Ireland, Brazil and throughout other parts of the world as a corporate member of Lloyd's. Business and International Insurance is organized as follows:

Domestic

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Select Accounts provides small businesses with property and casualty products, including commercial multi-peril, commercial property, general liability, commercial auto and workers' compensation insurance.



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Middle Market provides mid-sized businesses with property and casualty products, including commercial multi-peril, commercial property, general liability, commercial auto and workers' compensation insurance, as well as risk management, claims handling and other services. Middle Market generally provides these products to mid-sized businesses through Commercial Accounts, as well as to targeted industries through Construction, Technology, Public Sector Services and Oil & Gas. Middle Market also provides mono-line umbrella and excess coverage insurance through Excess Casualty and insurance coverages for foreign organizations with United States exposures through Global Partner Services.



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National Accounts provides large companies with casualty products and services, including workers' compensation, general liability and automobile liability, generally utilizing loss-sensitive products, on both a bundled and unbundled basis. National Accounts also includes the Company's commercial residual market business, which primarily offers workers' compensation products and services to the involuntary market.



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First Party provides traditional and customized property insurance programs to large and mid-sized customers through National Property, insurance for goods in transit and movable objects, as well as builders' risk insurance, through Inland Marine, insurance for the marine transportation industry and related services, as well as other businesses involved in international trade, through Ocean Marine, and comprehensive breakdown coverages for equipment, including property and business interruption coverages, through Boiler & Machinery.



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Specialized Distribution markets and underwrites its products to customers predominantly through brokers, wholesale agents, program managers and specialized retail agents that manage customers' unique insurance requirements. Specialized Distribution provides insurance coverage for the commercial transportation industry, as well as commercial liability and commercial property policies for small, difficult to place specialty classes of commercial business primarily on an excess and surplus lines basis, through Northland, and tailored property and casualty programs on an admitted basis for customers with common risk characteristics or coverage

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requirements through National Programs. Specialized Distribution also serves small to medium-sized agricultural businesses, including farms, ranches, wineries and related operations, through Agribusiness.

International

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International, through its operations in Canada, the United Kingdom and the Republic of Ireland, offers property and casualty insurance and risk management services to several customer groups, including, among others, those in the technology, public services, and financial and professional services industry sectors. In addition, International markets personal lines and small commercial insurance business in Canada through The Dominion of Canada General Insurance Company (Dominion), which the Company acquired on November 1, 2013. International, through its Lloyd's syndicate (Syndicate 5000), for which the Company provides 100% of the capital, underwrites five principal businesses—marine, global property, accident & special risks, power & utilities and aviation.

International also includes results from J. Malucelli Participações em Seguros e Resseguros S.A. (JMalucelli) and J. Malucelli Latam S.A. in Brazil. The Company owns 49.5% of both JMalucelli, a market leader in surety coverages in Brazil, and J. Malucelli Latam S.A., which in September 2015 acquired a majority interest in JMalucelli Travelers Seguros S.A., a Colombian start-up surety provider. These joint venture investments are accounted for using the equity method and are included in "other investments" on the consolidated balance sheet. Also, as a result of a transaction that was completed in October 2015 with Paraná Banco S.A., the Company's joint venture partner in Brazil, the Company acquired 100% of the common stock of Travelers Participações em Seguros Brasil S.A., which comprises JMalucelli's former property and casualty insurance business other than surety. The Company consolidates this investment in its financial statements and includes Paraná Banco S.A.'s preferred stock interest in "other liabilities."

        Business and International Insurance also includes the Special Liability Group (which manages the Company's asbestos and environmental liabilities) and the assumed reinsurance and certain other runoff operations, which are collectively referred to as Business and International Insurance Other.

Selected Market and Product Information

        The following table sets forth the Business and International Insurance segment's net written premiums by market and product line for the periods indicated. For a description of the markets and

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product lines referred to in the table, see "—Principal Markets and Methods of Distribution" and "—Product Lines," respectively.

Principal Markets and Methods of Distribution

        The Business and International Insurance segment distributes its products through approximately 11,300 independent agencies and brokers. Agencies and brokers are serviced by 127 field offices and three customer service centers.

        Business and International Insurance continues to make significant investments in enhanced technology utilizing internet-based applications to provide real-time interface capabilities with independent agencies and brokers. Business and International Insurance builds relationships with well-established, independent insurance agencies and brokers. In selecting new independent agencies and brokers to distribute its products, Business and International Insurance considers, among other attributes, each agency's or broker's financial strength, staff experience and strategic fit with the Company's operating and marketing plans. Once an agency or broker is appointed, Business and International Insurance carefully monitors its performance. The majority of products offered in the United States are distributed through a common base of independent agents and brokers, many of whom also sell the Company's Personal Insurance products. Additionally, several operations may underwrite business with agents that specialize in servicing the needs of certain of the industries served by these operations.

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Select Accounts is a leading provider of commercial property and casualty insurance products to small businesses in the U.S., generally with fewer than 50 employees, and sells these products through a large network of independent agents and brokers. Products offered by Select Accounts

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are guaranteed-cost policies, including packaged products covering property and liability exposures. Each small business risk is independently evaluated via an automated underwriting platform which in turn enables agents to quote, bind and issue a substantial amount of new small business risks at their desktop in an efficient manner that significantly reduces the time period between quoting a price on a new policy and issuing that policy. Risks with more complex characteristics are underwritten with the assistance of Company personnel. Select Accounts has established a strong marketing relationship with its distribution network and has provided this network with defined underwriting policies, a broad array of products and competitive prices. In addition, the Company has established centralized service centers to help agents perform many service functions, in return for a fee.

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Middle Market sells a broad range of commercial property and casualty insurance products and services through a large network of independent agents and brokers, primarily targeting mid-sized businesses in the U.S. with 50 to 1,000 employees. The Company offers a full line of products to its Middle Market customers with an emphasis on guaranteed cost programs. Each account is underwritten based on the unique risk characteristics, loss history and coverage needs of the account. The ability to underwrite at this detailed level allows Middle Market to have a broad risk appetite and a diversified customer base. Within Middle Market, products and services are tailored to certain targeted industry segments of significant size and complexity that require unique underwriting, claim, risk management or other insurance-related products and services.



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National Accounts sells a variety of casualty products and services to large companies in the U.S. through a network of national and regional brokers, primarily utilizing loss-sensitive products in connection with a large deductible or self-insured program and, to a lesser extent, a retrospectively rated or a guaranteed cost insurance policy. National Accounts also provides casualty products and services through retail brokers on an unbundled basis, using third-party administrators for insureds who utilize programs such as collateralized deductibles, captive reinsurers and self-insurance. National Accounts provides insurance-related services, such as risk management services, claims administration, loss control and risk management information services, either in addition to, or in lieu of, pure risk coverage, and generated $253 million of fee income in 2015, excluding commercial residual market business. The commercial residual market business of National Accounts sells claims and policy management services to workers' compensation pools throughout the United States, and generated $138 million of fee income in 2015. National Accounts services approximately 36% of the total workers' compensation assigned risk market, making the Company one of the largest servicing carriers in the industry. Workers' compensation accounted for approximately 73% of sales to National Accounts customers during 2015, based on direct written premiums and fees.



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First Party markets commercial property and casualty insurance products and services through a large network of agents and brokers to a wide customer base in the U.S. having specialized property and casualty coverage requirements. First Party provides traditional and customized property insurance programs to large and mid-sized customers; insurance for goods in transit and movable objects; builders' risk insurance; and insurance for the marine transportation industry, providers of related services and other businesses involved in international trade. In addition, First Party provides comprehensive breakdown coverages for equipment, including property and business interruption coverages.



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Specialized Distribution distributes admitted as well as excess and surplus lines property and casualty products predominantly through selected brokers, wholesale agents, program managers and specialized retail agents, including on a brokerage and delegated authority underwriting basis. These brokers, wholesale agents, program managers and specialized retail agents operate in certain markets in the U.S. that are not typically served by the Company's appointed retail

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agents, or they maintain certain affinity arrangements in specialized market segments. The wholesale excess and surplus lines market, which is characterized by the absence of rate and form regulation, allows for more flexibility to write certain classes of business. In working with agents or program managers on a brokerage basis, Specialized Distribution underwrites the business and sets the premium level. In working with agents or program managers with delegated underwriting authority, the agents produce and underwrite business subject to underwriting guidelines that have been specifically designed for each facility or program.

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International distributes its products principally through brokers in each of the countries in which it operates. International also writes business at Lloyd's, where its products are distributed through Lloyd's wholesale and retail brokers. By virtue of Lloyd's worldwide licenses, the Business and International Insurance segment has access to international markets across the world.

Pricing and Underwriting

        Business and International Insurance utilizes underwriting, claims, engineering, actuarial and product development disciplines for particular industries, in conjunction with extensive amounts of proprietary data gathered and analyzed over many years, to facilitate its risk selection process and develop pricing parameters. The Company utilizes both standard industry forms and proprietary forms for the insurance policies it issues.

        A portion of business in this segment, particularly in National Accounts and Construction, is written with large deductible insurance policies. Under workers' compensation insurance contracts with deductible features, the Company is obligated to pay the claimant the full amount of the claim. The Company is subsequently reimbursed by the contractholder for the deductible amount and is subject to credit risk until such reimbursement is made. At December 31, 2015, contractholder payables on unpaid losses within the deductible layer of large deductible policies and the associated receivables were each approximately $4.37 billion. Business and International Insurance also utilizes retrospectively rated policies for another portion of the business, primarily for workers' compensation coverage. Although the retrospectively rated feature of the policy substantially reduces insurance risk for the Company, it introduces additional credit risk to the Company. Premium receivables from holders of retrospectively rated policies totaled approximately $88 million at December 31, 2015. Significant collateral, primarily letters of credit and, to a lesser extent, cash collateral, trusts or surety bonds, is generally obtained for large deductible plans and/or retrospectively rated policies that provide for deferred collection of deductible recoveries and/or ultimate premiums. The amount of collateral requested is predicated upon the creditworthiness of the customer and the nature of the insured risks. Business and International Insurance continually monitors the credit exposure on individual accounts and the adequacy of collateral. For additional information concerning credit risk in certain of the Company's businesses, see "Item 1A—Risk Factors—We are exposed to credit risk in certain of our business and investment operations including reinsurance or structured settlements."

Product Lines

        The Business and International Insurance segment writes the following types of coverages:

Domestic

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Workers' Compensation.  Provides coverage for employers for specified benefits payable under state or federal law for workplace injuries to employees. There are typically four types of benefits payable under workers' compensation policies: medical benefits, disability benefits, death benefits and vocational rehabilitation benefits. The Company emphasizes managed care cost containment strategies, which involve employers, employees and care providers in a cooperative

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effort that focuses on the injured employee's early return to work and cost-effective quality care. The Company offers the following types of workers' compensation products:

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guaranteed-cost insurance products, in which policy premium charges are fixed for the period of coverage and do not vary as a result of the insured's loss experience;



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loss-sensitive insurance products, including large deductible and retrospectively rated policies, in which fees or premiums are adjusted based on actual loss experience of the insured during the policy period; and



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service programs, which are generally sold to the Company's National Accounts customers, where the Company receives fees rather than premiums for providing loss prevention, risk management, and claim and benefit administration services to organizations under service agreements.

The Company also participates in state assigned risk pools as a servicing carrier and pool participant.

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Commercial Automobile.  Provides coverage for businesses against losses incurred from personal bodily injury, bodily injury to third parties, property damage to an insured's vehicle and property damage to other vehicles and other property resulting from the ownership, maintenance or use of automobiles and trucks in a business.



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Commercial Property.  Provides coverage for loss of or damage to buildings, inventory and equipment from a variety of events, including, among others, hurricanes and other windstorms, tornadoes, earthquakes, hail, wildfires, severe winter weather, floods, volcanic eruptions, tsunamis, theft, vandalism, fires, explosions, terrorism and financial loss due to business interruption resulting from covered property damage. For additional information on terrorism coverages, see "Reinsurance—Catastrophe Reinsurance—Terrorism Risk Insurance Program." Commercial property also includes specialized equipment insurance, which provides coverage for loss or damage resulting from the mechanical breakdown of boilers and machinery, and ocean and inland marine insurance, which provides coverage for goods in transit and unique, one-of-a-kind exposures.



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General Liability.  Provides coverages for businesses against third-party claims arising from accidents occurring on their premises or arising out of their operations, including as a result of injuries sustained from products sold. Specialized liability policies may also include coverage for directors' and officers' liability arising in their official capacities, employment practices liability insurance, fiduciary liability for trustees and sponsors of pension, health and welfare, and other employee benefit plans, errors and omissions insurance for employees, agents, professionals and others arising from acts or failures to act under specified circumstances, as well as umbrella and excess insurance.



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Commercial Multi-Peril.  Provides a combination of the property and liability coverages described in the foregoing product line descriptions.

International

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Provides coverage for auto and motor (similar to automobile coverage in the United States), personal property, employers' liability (similar to workers' compensation coverage in the United States), public and product liability (the equivalent of general liability), professional indemnity (similar to professional liability coverage), commercial property, surety, marine, aviation, personal accident and kidnap & ransom. Marine provides coverage for ship hulls, cargoes carried, private yachts, marine-related liability, offshore energy, ports and terminals, fine art and terrorism. Aviation provides coverage for worldwide aviation risks including physical damage and

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liabilities for airline, aerospace, general aviation, aviation war and space risks. Personal accident provides financial protection in the event of death or disablement due to accidental bodily injury, while kidnap & ransom provides financial protection against kidnap, hijack, illegal detention and extortion. While the covered hazards may be similar to those in the U.S. market, the different legal environments can make the product risks and coverage terms potentially very different from those the Company faces in the United States.

Net Retention Policy Per Risk

        The following discussion reflects the Company's retention policy with respect to the Business and International Insurance segment as of January 1, 2016. For third-party liability, Business and International Insurance generally limits its net retention, through the use of reinsurance, to a maximum of $16.0 million per insured, per occurrence. For property exposures, Business and International Insurance generally limits its retained amount per risk to $20.0 million per occurrence, net of reinsurance. Business and International Insurance generally retains its workers' compensation exposures. Reinsurance treaties often have aggregate limits or caps which may result in larger net per-risk retentions if the aggregate limits or caps are reached. Business and International Insurance utilizes facultative reinsurance to provide additional limits capacity or to reduce retentions on an individual risk basis. Business and International Insurance may also retain amounts greater than those described herein based upon the individual characteristics of the risk.

Geographic Distribution

        The following table shows the geographic distribution of Business and International Insurance's direct written premiums for the year ended December 31, 2015:

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Competition

        The insurance industry is represented in the commercial marketplace by many insurance companies of varying size as well as other entities offering risk alternatives, such as self-insured retentions or captive programs. Market competition works within the insurance regulatory framework to set the price charged for insurance products and the levels of coverage and service provided. A company's success in the competitive commercial insurance landscape is largely measured by its ability to profitably provide insurance and services, including claims handling and risk control, at prices and terms that retain existing customers and attract new customers.

Domestic

        Competitors typically write Select Accounts business through independent agents and, to a lesser extent, regional brokers, and as direct writers. Both national and regional property and casualty insurance companies compete in the Select Accounts market which generally comprises lower-hazard, "Main Street" business customers. Risks are underwritten and priced using standard industry practices and a combination of proprietary and standard industry product offerings. Competition in this market is primarily based on product offerings, service levels, ease of doing business and price.

        Competitors typically write Middle Market business through independent agents and brokers. Several of Middle Market's operations require unique combinations of industry knowledge, customized coverage, specialized risk control and loss handling services, along with partnerships with agents and brokers that also focus on these markets. Competitors in this market are primarily national property and casualty insurance companies that write most classes of business using traditional products and pricing, and regional insurance companies. Companies compete based on product offerings, service levels, price and claim and loss prevention services. Efficiency through automation and rapid response time to agent, broker and customer needs is one key to success in this market.

        In the National Accounts market, competition is based on price, product offerings, claim and loss prevention services, managed care cost containment, risk management information systems and collateral requirements. National Accounts primarily competes with national property and casualty insurance companies, as well as with other underwriters of property and casualty insurance in the alternative risk transfer market, such as self-insurance plans, captives managed by others, and a variety of other risk-financing vehicles and mechanisms. The residual market division competes for state contracts to provide claims and policy management services.

        First Party and Specialized Distribution compete in focused target markets. Each of these markets is different and requires unique combinations of industry knowledge, customized coverage, specialized risk control and loss handling services, along with partnerships with agents and brokers that also focus on these markets. Some of these businesses compete with national carriers with similarly dedicated underwriting and marketing groups, whereas others compete with smaller regional companies. Each of these businesses has regional structures that allow them to deliver personalized service and local knowledge to their customer base. Specialized agents and brokers, including wholesale agents and program managers, supplement this strategy. In all of these businesses, the competitive strategy typically is the application of focused industry knowledge to insurance and risk needs.

International

        International competes with numerous international and domestic insurers in Canada, the United Kingdom, the Republic of Ireland and Brazil. Companies compete on the basis of price, product offerings and the level of claim and risk management services provided. The Company has developed expertise in various markets in these countries similar to those served in the United States and provides both property and casualty coverage for these markets.

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        At Lloyd's, International competes with other syndicates operating in the Lloyd's market as well as international and domestic insurers in the various markets where the Lloyd's operation writes business worldwide. Competition is again based on price, product and service. The Company focuses on lines it believes it can underwrite effectively and profitably with an emphasis on short-tail insurance lines.

BOND & SPECIALTY INSURANCE

        The Bond & Specialty Insurance segment provides surety, fidelity, management liability, professional liability, and other property and casualty coverages and related risk management services to a wide range of primarily domestic customers, utilizing various degrees of financially-based underwriting approaches. The range of coverages includes performance, payment and commercial surety and fidelity bonds for construction and general commercial enterprises; management liability coverages including directors and officers liability, employee dishonesty, employment practices liability, fiduciary liability and cyber risk for public corporations, private companies and not-for-profit organizations; professional liability coverage for a variety of professionals including, among others, lawyers and design professionals; and management liability, professional liability, property, workers' compensation, auto and general liability for financial institutions.

Selected Market and Product Information

        The following table sets forth Bond & Specialty Insurance net written premiums by product line for the periods indicated. For a description of the product lines referred to in the table, see "Principal Markets and Methods of Distribution" and "Product Lines," respectively.

Principal Markets and Methods of Distribution

        Bond & Specialty Insurance distributes the vast majority of its products in the United States through approximately 5,900 of the same independent agencies and brokers that distribute the Business and International Insurance segment's products in the U.S. The Bond & Specialty Insurance segment, in conjunction with the Business and International Insurance segment, continues to make investments in enhanced technology utilizing internet-based applications to provide real-time interface capabilities with its independent agencies and brokers. Bond & Specialty Insurance builds relationships with well-established, independent insurance agencies and brokers. In selecting new independent agencies and brokers to distribute its products, Bond & Specialty Insurance considers, among other attributes, each agency's or broker's profitability, financial stability, staff experience and strategic fit with its operating and marketing plans. Once an agency or broker is appointed, its ongoing performance is closely monitored.

Pricing and Underwriting

        Bond & Specialty Insurance utilizes underwriting, claims, engineering, actuarial and product development disciplines for specific accounts and industries, in conjunction with extensive amounts of proprietary data gathered and analyzed over many years, to facilitate its risk selection process and develop pricing parameters. The Company utilizes both standard industry forms and proprietary forms for the insurance policies it issues.

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Product Lines

        The Bond & Specialty Insurance segment writes the following types of coverages:

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Fidelity and Surety.  Provides fidelity insurance coverage, which protects an insured for loss due to embezzlement or misappropriation of funds by an employee, and surety, which is a three-party agreement whereby the insurer agrees to pay a third party or make complete an obligation in response to the default, acts or omissions of an insured. Surety is generally provided for construction performance, legal matters such as appeals, trustees in bankruptcy and probate and other performance bonds.



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General Liability.  Provides coverage for specialized liability exposures as described above in more detail in the "Business and International Insurance" section of this report, as well as cyber risk coverages.



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Other.  Coverages include Property, Workers' Compensation, Commercial Automobile and Commercial Multi-Peril, which are described above in more detail in the "Business and International Insurance" section of this report.

Net Retention Policy Per Risk

        The following discussion reflects the Company's retention policy with respect to the Bond & Specialty Insurance segment as of January 1, 2016. For third party liability, including but not limited to umbrella liability, professional liability, directors' and officers' liability, employment practices liability and cyber risk liability, Bond & Specialty Insurance generally limits net retentions to $25.0 million per policy. For surety protection, where insured limits are often significant, Bond & Specialty Insurance generally retains up to $115.0 million probable maximum loss (PML) per principal, after reinsurance, but may retain higher amounts based on the type of obligation, credit quality and other credit risk factors. Reinsurance treaties often have aggregate limits or caps which may result in larger net per risk retentions if the aggregate limits or caps are reached. Bond & Specialty Insurance utilizes facultative reinsurance to provide additional limits capacity or to reduce retentions on an individual risk basis. Bond & Specialty Insurance may also retain amounts greater than those described herein based upon the individual characteristics of the risk.

Geographic Distribution

        The following table shows the geographic distribution of Bond & Specialty Insurance's direct written premiums for the year ended December 31, 2015:

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Competition

        The competitive landscape in which the Bond & Specialty Insurance segment operates is affected by many of the same factors described previously for the Business and International Insurance segment. Competitors in this market are primarily national property and casualty insurance companies that write most classes of business and, to a lesser extent, regional insurance companies and companies that have developed niche programs for specific industry segments.

        Bond & Specialty Insurance underwrites and markets its products to all sizes of businesses and other organizations, as well as individuals. The Company believes that its reputation for timely and consistent decision making, a nationwide network of local underwriting, claims and industry experts and strong producer and customer relationships, as well as its ability to offer its customers a full range of products, provides Bond & Specialty Insurance an advantage over many of its competitors and enables it to compete effectively in a complex, dynamic marketplace. The Company believes that the ability of the Bond & Specialty Insurance segment to cross-sell its products to customers of the Business and International Insurance and Personal Insurance segments provides additional competitive advantages for the Company.

PERSONAL INSURANCE

        The Company's Personal Insurance segment writes a broad range of property and casualty insurance covering individuals' personal risks. The primary products of automobile and homeowners insurance are complemented by a broad suite of related coverages.

Selected Product and Distribution Channel Information

        The following table sets forth net written premiums for the Personal Insurance segment's business by product line for the periods indicated. For a description of the product lines referred to in the following table, see "—Product Lines." In addition, see "—Principal Markets and Methods of Distribution" for a discussion of distribution channels for Personal Insurance's product lines.

Principal Markets and Methods of Distribution

        Personal Insurance products are distributed primarily through approximately 11,100 active independent agencies located throughout the United States, supported by personnel in nine sales regions. In addition, sales and service are provided to customers through five contact centers. While the principal markets for Personal Insurance products continue to be in states along the East Coast, California and Texas, the business continues to expand its geographic presence across the United States. See "Competition" below for a discussion of the Company's newest private passenger automobile product, Quantum Auto 2.0.

        In selecting new independent agencies to distribute its products, Personal Insurance considers, among other attributes, each agency's profitability, financial stability, staff experience and strategic fit with the segment's operating and marketing plans. Once an agency is appointed, Personal Insurance carefully monitors its performance.

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        Agents can access the Company's agency service portal for a number of resources including customer service, marketing and claims management. In addition, agencies can choose to shift the ongoing service responsibility for Personal Insurance's customers to one of the Company's Customer Care Centers, where the Company provides, on behalf of an agency, a comprehensive array of customer service needs, including response to billing and coverage inquiries, and policy changes. Approximately 1,400 agents take advantage of this service alternative, for which they generally pay a fee.

        Personal Insurance also distributes its products through additional channels, including corporations that make the company's product offerings available to their employees primarily through payroll deduction, consumer associations and affinity groups. Personal Insurance handles the sales and service for these programs either through a sponsoring independent agent or through the Company's contact center locations. In addition, since 1995, the Company has had a marketing agreement with GEICO to underwrite homeowners business for certain of their auto customers.

        In 2009, the Company began marketing its insurance products directly to consumers, largely through online channels. The investment in the direct-to-consumer initiative has generated growing but still modest premium volume for Personal Insurance in recent years, reflective of the Company's targeted customer base. The direct-to-consumer initiative, while intended to enhance the Company's long-term ability to compete successfully in a consumer-driven marketplace, is expected to remain modest with respect to premium volume and remain unprofitable for a number of years.

Pricing and Underwriting

        Personal Insurance has developed a product management methodology that integrates the disciplines of underwriting, claim, actuarial and product development. This approach is designed to maintain high quality underwriting discipline and pricing segmentation. Proprietary data accumulated over many years is analyzed and Personal Insurance uses a variety of risk differentiation models to facilitate its pricing segmentation. The Company's product management area establishes underwriting guidelines integrated with its filed pricing and rating plans, which enable Personal Insurance to effectively execute its risk selection and pricing processes.

        Pricing for personal automobile insurance is driven in large part by changes in the frequency of claims and by inflation in the cost of automobile repairs, medical care and litigation of liability claims. Pricing in the homeowners business is driven in large part by changes in the frequency of claims and by inflation in the cost of building supplies, labor and household possessions. In addition to the normal risks associated with any multiple peril coverage, the profitability and pricing of both homeowners and automobile insurance are affected by the incidence of natural disasters, particularly those related to weather and, for homeowners insurance, earthquakes. Insurers writing personal lines property and casualty policies may be unable to increase prices until some time after the costs associated with coverage have increased, primarily because of state insurance rate regulation. The pace at which an insurer can change rates in response to increased costs depends, in part, on whether the applicable state law requires prior approval of rate increases or notification to the regulator either before or after a rate change is imposed. In states with prior approval laws, rates must be approved by the regulator before being used by the insurer. In states having "file-and-use" laws, the insurer must file rate changes with the regulator, but does not need to wait for approval before using the new rates. A "use-and-file" law requires an insurer to file rates within a period of time after the insurer begins using the new rate. Approximately one-half of the states require prior approval of most rate changes. In addition, changes to methods of marketing and underwriting in some jurisdictions are subject to state-imposed restrictions, which can make it more difficult for an insurer to significantly manage catastrophe exposures.

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        The Company's ability or willingness to raise prices, modify underwriting terms or reduce exposure to certain geographies may be limited due to considerations of public policy, the competitive environment, the evolving political environment and/or changes in the general economic climate. The Company also may choose to write business it might not otherwise write in some states for strategic purposes, such as improving access to other commercial or personal underwriting opportunities. In choosing to write business in some states, the Company also considers the costs and benefits of those states' residual markets and guaranty funds, as well as other property and casualty business the Company writes in those states.

Product Lines

        The primary coverages in Personal Insurance are personal automobile and homeowners and other insurance sold to individuals. Personal Insurance had approximately 6.4 million active policies (e.g., policies-in-force) at December 31, 2015.

        The Personal Insurance segment writes the following types of coverages:

•

Personal Automobile provides coverage for liability to others for both bodily injury and property damage, uninsured motorist protection, and for physical damage to an insured's own vehicle from collision, fire, flood, hail and theft. In addition, many states require policies to provide first-party personal injury protection, frequently referred to as no-fault coverage.



•

Homeowners and Other provides protection against losses to residences and contents from a variety of perils (excluding flooding) as well as coverage for personal liability. The Company writes homeowners insurance for dwellings, condominiums and tenants, and rental properties. The Company also writes coverage for boats and yachts and valuable personal items such as jewelry, and also writes coverages for umbrella liability, identity fraud, and weddings and special events.

Net Retention Policy Per Risk

        The following discussion reflects the Company's retention policy with respect to the Personal Insurance segment as of January 1, 2016. Personal Insurance generally retains its primary personal auto exposures in their entirety. For personal property insurance, there is an $8.0 million maximum retention per risk, net of reinsurance. Personal Insurance uses facultative reinsurance to provide additional limits capacity or to reduce retentions on an individual risk basis. Personal Insurance issues umbrella policies up to a maximum limit of $10.0 million per risk. Personal Insurance may also retain amounts greater than those described herein based upon the individual characteristics of the risk.

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Geographic Distribution

        The following table shows the geographic distribution of Personal Insurance's direct written premiums for the year ended December 31, 2015:

Competition

        Although national companies write the majority of this business, Personal Insurance also faces competition from many regional and hundreds of local companies. Personal Insurance primarily competes based on breadth of product offerings, price, service (including claims handling), ease of doing business, stability of the insurer and name recognition. Personal Insurance competes for business within each independent agency since these agencies also offer policies of competing companies. At the agency level, competition is primarily based on price, service (including claims handling), the level of automation and the development of long-term relationships with individual agents. In recent years, most independent personal insurance agents have begun utilizing price comparison rating technology, sometimes referred to as "comparative raters," as a cost-efficient means of obtaining quotes from multiple companies. Because the use of this technology facilitates the process of generating multiple quotes, the technology has increased price comparison on new business and, increasingly, on renewal business. Personal Insurance also competes with insurance companies that use exclusive agents or salaried employees to sell their products, as well as those that employ direct marketing strategies. See "Item 1A—Risk Factors—The intense competition that we face could harm our ability to maintain or increase our business volumes and our profitability" herein.

        The Agency Automobile line of business has been negatively impacted by various factors, including the use of price comparison technology by agents and brokers as discussed above. The Company's actions in response to these factors have included, among other things, the reduction of claim adjustment and other insurance expenses, with the majority of the impact in the Agency Automobile line of business. Additionally, in the fourth quarter of 2013, the Company launched its newest private passenger automobile product, Quantum Auto 2.0, which has a lower base commission rate than the Company's prior Quantum Auto 1.0 product. These changes in cost structure enabled the Company to

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price Quantum Auto 2.0 more competitively while maintaining expected returns at appropriate levels over time. By December 31, 2015, the Company was offering Quantum Auto 2.0 in all of the states in which it had intended to introduce the product. All new accounts in these states are being written using Quantum Auto 2.0, and the product is available to agents at their discretion for existing accounts.

CLAIMS MANAGEMENT

        The Company's claim functions are managed through its Claims Services organization, with locations in the United States and in the other countries where it does business. With more than 11,000 employees, Claims Services employs a group of professionals with diverse skills, including claim adjusters, appraisers, attorneys, investigators, engineers, accountants, system specialists and training, management and support personnel. Approved external service providers, such as investigators, attorneys and, in the rare circumstances when necessary, independent adjusters and appraisers, are available for use as appropriate.

        U.S. field claim management teams located in 21 claim centers and 53 satellite and specialty-only offices in 45 states are organized to maintain focus on the specific claim characteristics unique to the businesses within the Company's business segments. Claim teams with specialized skills, required licenses, resources and workflows are matched to the unique exposures of those businesses, with local claims management dedicated to achieving optimal results within each segment. The Company's home office operations provide additional support in the form of workflow design, quality management, information technology, advanced management information and data analysis, training, financial reporting and control, and human resources strategy. This structure permits the Company to maintain the economies of scale of a large, established company while retaining the agility to respond promptly to the needs of customers, brokers, agents and underwriters. Claims management for International, while generally provided locally by staff in the respective international locations due to local knowledge of applicable laws and regulations, is also managed by the Company's Claims Services organization in the U.S. to leverage that knowledge base and to share best practices.

        An integral part of the Company's strategy to benefit customers and shareholders is its continuing industry leadership in the fight against insurance fraud through its Investigative Services unit. The Company has a nationwide staff of experts who investigate a wide array of insurance fraud schemes using in-house forensic resources and other technological tools. This staff also has specialized expertise in fire scene examinations, medical provider fraud schemes and data mining. The Company also dedicates investigative resources to ensure that violations of law are reported to and prosecuted by law enforcement agencies.

        Claims Services uses technology, management information and data analysis to assist the Company in reviewing its claim practices and results in order to evaluate and improve its claims management performance. The Company's claims management strategy is focused on segmentation of claims and appropriate technical specialization to drive effective claim resolution. The Company continually monitors its investment in claim resources to maintain an effective focus on claim outcomes and a disciplined approach to continual improvement. The Company operates a state-of-the-art claims training facility which offers hands-on experiential learning to help ensure that its claim professionals are properly trained. In recent years, the Company has invested significant additional resources in many of its claim handling operations and routinely monitors the effect of those investments to ensure a consistent optimization among outcomes, cost and service.

        Claims Services' catastrophe response strategy is to respond to a significant catastrophic event using its own personnel, enabling it to minimize reliance on independent adjusters and appraisers. The Company has developed a large dedicated catastrophe response team and trained a large Enterprise Response Team of existing employees who can be deployed on short notice in the event of a catastrophe that generates claim volume exceeding the capacity of the dedicated catastrophe response team. In recent years, these internal resources were successfully deployed to respond to a record number of catastrophe claims.

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REINSURANCE

        The Company reinsures a portion of the risks it underwrites in order to manage its exposure to losses and to protect its capital. The Company cedes to reinsurers a portion of these risks and pays premiums based upon the risk and exposure of the policies subject to such reinsurance. The Company utilizes a variety of reinsurance agreements to manage its exposure to large property and casualty losses, including catastrophe, treaty, facultative and quota share reinsurance. Ceded reinsurance involves credit risk, except with regard to mandatory pools and associations, and is predominantly subject to aggregate loss limits. Although the reinsurer is liable to the Company to the extent of the reinsurance ceded, the Company remains liable as the direct insurer on all risks reinsured. Reinsurance recoverables are reported after reductions for known insolvencies and after allowances for uncollectible amounts. The Company also holds collateral, including trust agreements, escrow funds and letters of credit, under certain reinsurance agreements. The Company monitors the financial condition of reinsurers on an ongoing basis and reviews its reinsurance arrangements periodically. Reinsurers are selected based on their financial condition, business practices, the price of their product offerings and the value of collateral provided. After reinsurance is purchased, the Company has limited ability to manage the credit risk to a reinsurer. In addition, in a number of jurisdictions, particularly the European Union and the United Kingdom, a reinsurer is permitted to transfer a reinsurance arrangement to another reinsurer, which may be less creditworthy, without a counterparty's consent, provided that the transfer has been approved by the applicable regulatory and/or court authority.

        For additional information regarding reinsurance, see note 5 of notes to the consolidated financial statements and "Item 1A—Risk Factors" herein. For a description of reinsurance-related litigation, see note 16 of notes to the consolidated financial statements herein.

Catastrophe Reinsurance

        Catastrophes can be caused by a variety of events, including, among others, hurricanes, tornadoes and other windstorms, earthquakes, hail, wildfires, severe winter weather, floods, tsunamis, volcanic eruptions and other naturally-occurring events, such as solar flares. Catastrophes can also result from terrorist attacks and other intentionally destructive acts including those involving nuclear, biological, chemical, radiological, cyber-attacks, explosions and infrastructure failures. The incidence and severity of catastrophes are inherently unpredictable. The extent of losses from a catastrophe is a function of both the total amount of insured exposure in the area affected by the event and the severity of the event. Most catastrophes are restricted to small geographic areas; however, hurricanes and earthquakes may produce significant damage in larger areas, especially those areas that are heavily populated. The Company generally seeks to manage its exposure to catastrophes through individual risk selection and the purchase of catastrophe reinsurance. The following discussion summarizes the Company's catastrophe reinsurance coverage at December 31, 2015.

        Corporate Catastrophe Excess-of-Loss Reinsurance Treaty.    This treaty covers the accumulation of certain property losses arising from one or multiple occurrences for the period January 1, 2016 through and including December 31, 2016: 75% ($1.5 billion) of qualifying losses covered by the treaty and 25% ($500 million) of qualifying losses retained by the Company part of $2.0 billion excess of $3.0 billion. Qualifying losses for each occurrence are after a $100 million deductible. The treaty covers all of the Company's exposures in the United States and Canada and their territories and possessions, the Caribbean Islands, Mexico and all waters contiguous thereto. The treaty only provides coverage for terrorism events in limited circumstances and excludes entirely losses arising from nuclear, biological, chemical or radiological attacks.

        Catastrophe Bonds.    The Company has catastrophe protection through two indemnity reinsurance agreements with Long Point Re III Ltd. (Long Point Re III), an independent Cayman Islands company licensed as a Class C insurer in the Cayman Islands. The reinsurance agreements expire in May 2016

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and May 2018, respectively, and both agreements meet the requirements to be accounted for as reinsurance in accordance with the guidance for reinsurance contracts. In connection with the reinsurance agreements, Long Point Re III issued notes (generally referred to as "catastrophe bonds") to investors in amounts equal to the full coverage provided under the reinsurance agreements as described below. The proceeds of both issuances were deposited in reinsurance trust accounts. The businesses covered by these reinsurance agreements are subsets of the Company's overall insurance portfolio, comprising specified property coverages spread across the following geographic locations: Connecticut, Delaware, District of Columbia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Virginia and Vermont.

        One reinsurance agreement with Long Point Re III expires in May 2016 and provides coverage of up to $300 million to the Company for certain losses from hurricanes in the locations listed above. The Company will be entitled to begin recovering amounts under this reinsurance agreement if the losses in the covered area for a single occurrence reach an initial attachment amount of $1.058 billion. The full $300 million coverage amount is available on a proportional basis until such covered losses reach a maximum $1.608 billion. The coverage under the reinsurance agreement is limited to specified property coverage written in the Company's Personal Insurance segment, and within Select Accounts and Commercial Accounts in the Company's Business and International Insurance segment.

        The other reinsurance agreement was entered into in May 2015 in connection with Long Point Re III's offering to unrelated investors of $300 million aggregate principal amount of catastrophe bonds. This reinsurance agreement expires in May 2018 and provides coverage of up to $300 million to the Company for losses from tropical cyclones, earthquakes, severe thunderstorms or winter storms in the locations listed above. The attachment point and maximum limit under this agreement will be reset annually to adjust the expected loss of the layer within a predetermined range. For the period May 16, 2015 through and including May 15, 2016, the Company will be entitled to begin recovering amounts under the reinsurance agreement if the losses in the covered area for a single occurrence reach an initial attachment amount of $2.0 billion. The full $300 million coverage amount is available on a proportional basis until such covered losses reach a maximum $2.50 billion. The coverage under the reinsurance agreement is limited to specified property coverage written in the Company's Personal Insurance segment; Select Accounts, Middle Market (excluding Excess Casualty and Global Partner Services), First Party (excluding Boiler & Machinery) and Specialized Distribution in the Company's Business and International Insurance segment; and Bond & Specialty Insurance Other in the Company's Bond & Specialty Insurance segment.

        Under the terms of both reinsurance agreements, the Company is obligated to pay annual reinsurance premiums to Long Point Re III for the reinsurance coverage. Amounts payable to the Company under both reinsurance agreements with respect to any covered event cannot exceed the Company's actual losses from such event. The principal amount of the respective catastrophe bond will be reduced by any amounts paid to the Company under the respective reinsurance agreement.

        As with any reinsurance agreement, there is credit risk associated with collecting amounts due from reinsurers. With regard to Long Point Re III, the credit risk is mitigated by reinsurance trust accounts that have been funded by Long Point Re III with money market funds that invest solely in direct government obligations and obligations backed by the U.S. government with maturities of no more than 13 months. The money market funds must have a principal stability rating of at least AAAm by Standard & Poor's on the issuance date of the bonds and thereafter must be rated by Standard & Poor's. Other permissible investments include money market funds which invest in repurchase and reverse repurchase agreements collateralized by direct government obligations and obligations of any agency backed by the U.S. government with terms of no more than 397 calendar days, and cash.

        At the time the agreements were entered into with Long Point Re III, the Company evaluated the applicability of the accounting guidance that addresses variable interest entities or VIEs. Under this

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guidance, an entity that is formed for business purposes is considered a VIE if: (a) the equity investors lack the direct or indirect ability through voting rights or similar rights to make decisions about an entity's activities that have a significant effect on the entity's operations, or (b) the equity investors do not provide sufficient financial resources for the entity to support its activities. Additionally, a company that absorbs a majority of the expected losses from a VIE's activities or is entitled to receive a majority of the entity's expected residual returns, or both, is considered to be the primary beneficiary of the VIE and is required to consolidate the VIE in the company's financial statements.

        As a result of the evaluation of the reinsurance agreements with Long Point Re III, the Company concluded that it was a VIE because the conditions described in items (a) and (b) above were present. However, while Long Point Re III was determined to be a VIE, the Company concluded that it did not have a variable interest in the entity, as the variability in its results, caused by the reinsurance agreements, is expected to be absorbed entirely by the investors in the catastrophe bonds issued by Long Point Re III and residual amounts earned by it, if any, are expected to be absorbed by the equity investors (the Company has neither an equity nor a residual interest in Long Point Re III).

        Accordingly, the Company is not the primary beneficiary of Long Point Re III and does not consolidate that entity in the Company's consolidated financial statements. Additionally, because the Company has no intention to pursue any transaction that would result in it acquiring interest in and becoming the primary beneficiary of Long Point Re III, the consolidation of that entity in the Company's consolidated financial statements in future periods is unlikely.

        The Company has not incurred any losses that have resulted or are expected to result in a recovery under the Long Point Re III agreements since their inception.

        Northeast General Catastrophe Reinsurance Treaty.    This northeast general catastrophe treaty provides up to $800 million part of $850 million of coverage, subject to a $2.25 billion retention, for certain losses arising from hurricanes, tornados, hail storms, earthquakes and winter storm or freeze losses from Virginia to Maine for the period July 1, 2015 through and including June 30, 2016. Losses from a covered event (occurring over several days) anywhere in the United States, Canada, the Caribbean and Mexico and waters contiguous thereto may be used to satisfy the retention. Recoveries (if any) under the catastrophe bonds described above would be first applied to reduce losses subject to this treaty.

        Middle Markets Earthquake Catastrophe Excess-of-Loss Reinsurance Treaty.    This earthquake excess-of-loss treaty provides for up to $150 million part of $165 million of coverage, subject to a $60 million retention, for losses arising from an earthquake, including fire following and sprinkler leakage incurred under policies written by Technology, Public Sector Services and Commercial Accounts in the Company's Business and International Insurance segment for the period July 1, 2015 through and including June 30, 2016.

        Personal Insurance Earthquake Excess-of-Loss Reinsurance Treaty.    This earthquake excess-of-loss treaty provides for up to $200 million of coverage, subject to a $150 million retention, for losses arising from an earthquake, including fire following and sprinkler leakage incurred under policies written by the Company's Personal Insurance segment for the period January 1, 2016 through December 31, 2016.

        Canadian Property Catastrophe Excess-of-Loss Reinsurance Contract.    This contract covers the accumulation of net property losses arising out of one occurrence on business written by the Company's Canadian businesses for the period July 1, 2015 through and including June 30, 2016. The treaty covers all property written by the Company's Canadian businesses for Canadian insureds, including, but not limited to, habitational property, commercial property, inland marine, ocean marine and auto physical damages exposures, with respect to risks located worldwide, written for Canadian insureds. The treaty provides coverage for 100% of loss retained in excess of C$100 million (US$72 million at December 31, 2015), up to C$800 million (US$578 million at December 31, 2015).

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        Other International Reinsurance Treaties.    For other business underwritten in Canada, as well as for business written in the United Kingdom, the Republic of Ireland, Brazil and in the Company's operations at Lloyd's, separate reinsurance protections are purchased locally that have lower net retentions more commensurate with the size of the respective local balance sheet. The Company conducts an ongoing review of its risk and catastrophe coverages and makes changes as it deems appropriate.

        Terrorism Risk Insurance Program.    The Terrorism Risk Insurance Program is a Federal program administered by the Department of the Treasury authorized through December 31, 2020 that provides for a system of shared public and private compensation for certain insured losses resulting from certified acts of terrorism. For a further description of the program, including the Company's estimated deductible under the program in 2016, see note 5 of notes to the consolidated financial statements and "Item 1A—Risk Factors—Catastrophe losses could materially and adversely affect our results of operations, our financial position and/or liquidity, and could adversely impact our ratings, our ability to raise capital and the availability and cost of reinsurance" herein.

CLAIMS AND CLAIM ADJUSTMENT EXPENSE RESERVES

        Claims and claim adjustment expense reserves represent management's estimate of ultimate unpaid costs of losses and loss adjustment expenses for claims that have been reported and claims that have been incurred but not yet reported.

        The Company continually refines its reserve estimates as part of a regular ongoing process that includes review of key assumptions, underlying variables and historical loss experience. The Company reflects adjustments to reserves in the results of operations in the periods in which the estimates are changed. In establishing reserves, the Company takes into account estimated recoveries for reinsurance, salvage and subrogation. The reserves are also reviewed regularly by qualified actuaries employed by the Company. For additional information on the process of estimating reserves and a discussion of underlying variables and risk factors, see "Item 7—Management's Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Estimates."

        The process of estimating loss reserves involves a high degree of judgment and is subject to a number of variables. These variables (discussed by product line in the "Critical Accounting Estimates" section of "Item 7—Management's Discussion and Analysis of Financial Condition and Results of Operations") are affected by both internal and external events, such as changes in claims handling procedures, inflation, judicial trends and legislative changes, among others. The impact of many of these items on ultimate costs for claims and claim adjustment expenses is difficult to estimate. Reserve estimation difficulties also differ significantly by product line due to differences in the underlying insurance contract (e.g., claims-made versus occurrence), claim complexity, the volume of claims, the potential severity of individual claims, the determination of the occurrence date for a claim, and reporting lags (the time between the occurrence of the insured event and when it is actually reported to the insurer). Informed judgment is applied throughout the process.

        The Company derives estimates for unreported claims and development with respect to reported claims principally from actuarial analyses of historical patterns of loss development by accident year for each type of exposure and business unit. Similarly, the Company derives estimates of unpaid loss adjustment expenses principally from actuarial analyses of historical development patterns of the relationship of loss adjustment expenses to losses for each line of business and type of exposure. For a description of the Company's reserving methods for asbestos and environmental claims, see "Item 7—Management's Discussion and Analysis of Financial Condition and Results of Operations—Asbestos Claims and Litigation," and "—Environmental Claims and Litigation."

        Certain of the Company's claims and claim adjustment expense reserves are discounted to present value. See note 1 of notes to the consolidated financial statements herein for further discussion.

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Claims and Claim Adjustment Expense Development Table

        The table that follows sets forth the year-end reserves from 2005 through 2015 and the subsequent changes in those reserves, presented on a historical basis. The original estimates, cumulative amounts paid and re-estimated reserves in the table for 2005 through 2012 have not been restated to reflect the acquisition of Dominion in November 2013 or the acquisition of Travelers Participações em Seguros Brasil S.A. in October 2015. The table includes Dominion's reserves beginning at December 31, 2013 and Travelers Participações em Seguros Brasil S.A.'s reserves beginning at December 31, 2015.

        The data in the table is presented in accordance with reporting requirements of the Securities and Exchange Commission (SEC). Care must be taken to avoid misinterpretation by those unfamiliar with this information or familiar with other data commonly reported by the insurance industry. The data in the table is not accident year data, but rather a display of 2005 to 2015 year-end reserves and the subsequent changes in those reserves.

        For instance, the cumulative deficiency or redundancy shown in the table for each year represents the aggregate amount by which original estimates of reserves as of that year-end have changed in subsequent years. Accordingly, the cumulative deficiency or redundancy for a year relates only to reserves at that year-end and those amounts are not additive. Expressed another way, if the original reserves at the end of 2005 included $4 million for a loss that is finally paid in 2009 for $5 million, the $1 million deficiency (the excess of the actual payment of $5 million over the original estimate of $4 million) would be included as a reduction in the cumulative redundancies in each of the years 2005 to 2008 shown in the accompanying table.

        Various factors may distort the re-estimated reserves and cumulative deficiency or redundancy shown in the table. For example, each year is impacted by claims on policies written prior to the mid-1980's involving liability exposures such as asbestos and environmental claims. In the post-1984 period, the Company has developed more stringent underwriting standards and policy exclusions and has significantly contracted or terminated the writing of these risks. See "Item 7—Management's Discussion and Analysis of Financial Condition and Results of Operations—Asbestos Claims and Litigation," and "—Environmental Claims and Litigation." General conditions and trends that have affected the development of these liabilities in the past will not necessarily recur in the future.

        Other factors that affect the data in the table include the discounting of certain reserves (as discussed above) and the use of retrospectively rated insurance policies. For example, reserves for long-term disability and annuity claim payments (tabular reserves), primarily arising from workers' compensation insurance and workers' compensation excess insurance policies, are discounted to reflect the time value of money. Apparent deficiencies will continue to occur as the discount on these workers' compensation reserves is accreted at a 5% interest rate. Also, a portion of National Accounts business is underwritten with retrospectively rated insurance policies in which the ultimate loss experience is primarily borne by the insured. For this business, increases in loss experience result in an increase in reserves and an offsetting increase in amounts recoverable from insureds. Likewise, decreases in loss experience result in a decrease in reserves and an offsetting decrease in amounts recoverable from these insureds. The amounts recoverable on these retrospectively rated policies mitigate the impact of the cumulative deficiencies or redundancies on the Company's earnings but are not reflected in the table.

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        Because of these and other factors, it is difficult to develop a meaningful extrapolation of estimated future redundancies or deficiencies in loss reserves from the data in the table.