0000011544wrb:InsuranceDomesticSegmentMemberus-gaap:OperatingSegmentsMemberus-gaap:NonUsMember2022-01-012022-12-31

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 10-K
(Mark One) 
☒ANNUAL REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 20222023
OR
☐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 1-15202

W. R. BERKLEY CORPORATION
(Exact name of registrant as specified in its charter)
Delaware 22-1867895
(State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification Number)
475 Steamboat RoadGreenwich,CT06830
(Address of principal executive offices)(Zip Code)
Registrant’s telephone number, including area code: (203) 629-3000
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading Symbol(s)Name of each exchange on which registered
 
Common Stock, par value $.20 per shareWRBNew York Stock Exchange
5.700% Subordinated Debentures due 2058WRB-PENew York Stock Exchange
5.100% Subordinated Debentures due 2059WRB-PFNew York Stock Exchange
4.250% Subordinated Debentures due 2060WRB-PGNew York Stock Exchange
4.125% Subordinated Debentures due 2061WRB-PHNew York Stock Exchange
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 ☒ No ☐
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. 
 Yes  ☐   No ☒

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 ☒   No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files).   Yes ☒     No ☐




Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer☒Accelerated filer☐
Non-accelerated filer☐Smaller reporting company☐
Emerging growth company☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
    ☐
Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.            ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements
of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant
to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).      Yes ☐     No ☒
The aggregate market value of the registrant's common stock held by non-affiliates as of June 30, 2022,2023, the last business day of the registrant’s most recently completed second fiscal quarter, was $14,340,165,170.$12,125,876,386.
Number of shares of common stock, $.20 par value, outstanding as of February 15, 2023: 263,446,3212024: 256,548,669
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Company’s definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, are incorporated herein by reference in Part III.

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PART I
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PART II
PART I
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SAFE HARBOR STATEMENT
UNDER THE PRIVATE SECURITIES
LITIGATION REFORM ACT OF 1995

    This is a “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995. This document may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Some of the forward-looking statements can be identified by the use of forward-looking words such as “believes,” “expects,” “potential,” “continued,” “may,” “will,” “should,” “seeks,” “approximately,” “predicts,” “intends,” “plans,” “estimates,” “anticipates” or the negative version of those words or other comparable words. Any forward-looking statements contained in this report including statements related to our outlook for the industry and for our performance for the year 20232024 and beyond, are based upon our historical performance and on current plans, estimates and expectations. The inclusion of this forward-looking information should not be regarded as a representation by us that the future plans, estimates or expectations contemplated by us will be achieved. They are subject to various risks and uncertainties, including but not limited to:

•the cyclical nature of the property casualty industry;
•the impact of significant competition, including new entrants to the industry;
•the long-tail and potentially volatile nature of the insurance and reinsurance business;
•product demand and pricing;
•claims development and the process of estimating reserves;
•investment risks, including those of our portfolio of fixed maturity securities and investments in equity securities, including investments in financial institutions, municipal bonds, mortgage-backed securities, loans receivable, investment funds, including real estate, merger arbitrage, energy related and private equity investments;
•the effects of emerging claim and coverage issues;
•the uncertain nature of damage theories and loss amounts, including claims for cyber security-related risks;
•natural and man-made catastrophic losses, including as a result of terrorist activities;
•the ongoing effects of the COVID-19 pandemic;pandemic or other potential pandemics;
•the impact of climate change, which may alter the frequency and increase the severity of catastrophe events;
•general economic and market activities, including inflation, interest rates and volatility in the credit and capital markets;
•the impact of conditions in the financial markets and the global economy, and the potential effect of legislative, regulatory, accounting or other initiatives taken in response to it, on our results and financial condition;
•cyber security breaches of our information technology systems and the information technology systems of our vendors and other third parties;
•foreign currency and political risks relating to our international operations;
•our ability to attract and retain key personnel and qualified employees;
•continued availability of capital and financing;
•the success of our new ventures or acquisitions and the availability of other opportunities;
•the availability of reinsurance;
•our retention under the Terrorism Risk Insurance Program Reauthorization Act of 2019 ("TRIPRA");
•the ability or willingness of our reinsurers to pay reinsurance recoverables owed to us;
•other legislative and regulatory developments, including those related to business practices in the insurance industry;
•credit risk relating to our policyholders, independent agents and brokers;
•changes in the ratings assigned to us or our insurance company subsidiaries by rating agencies;
•the availability of dividends from our insurance company subsidiaries;
•cyber security breaches of our information technology systems and the information technology systems of our vendors and other third parties;
•the effectiveness of our controls to ensure compliance with guidelines, policies and legal and regulatory standards; and
•other risks detailed in this Form 10-K and from time to time in our other filings with the Securities and Exchange Commission (“SEC”).
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We describe these risks and uncertainties in greater detail in Item 1A, Risk Factors. These risks and uncertainties could cause our actual results for the year 20232024 and beyond to differ materially from those expressed in any forward-looking statement we make. Any projections of growth in our revenues would not necessarily result in commensurate levels of earnings. Our future financial performance is dependent upon factors discussed elsewhere in this Form 10-K and our other SEC filings. Forward-looking statements speak only as of the date on which they are made.
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PART I
ITEM 1. BUSINESS
    W. R. Berkley Corporation is an insurance holding company that is among the largest commercial lines writers in the United States and operates worldwide in two segments of the property casualty insurance business:

•Insurance - Our Insurance businessbusinesses underwrite predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in Asia, Australia, Canada, Continental Europe, Mexico, Scandinavia, South America and the United Kingdom.

•Reinsurance & Monoline Excess - Our Reinsurance businesses provide facultative and treaty reinsurance in the United States, as well as in the Asia Pacific region, Australia, Continental Europe, South Africa and the United Kingdom. Monoline Excess businesses retain risk solely on an excess basis.
    Our two reporting segments are each composed of individual businesses that serve a market defined by geography, products, services or industry served. Each of our businesses is positioned close to its customer base and participates in a niche market requiring specialized knowledge. This strategy of decentralized operations allows each of our businesses to identify and respond quickly and effectively to changing market conditions and specific customer needs, while capitalizing on the benefits of centralized capital, investment and reinsurance management, and corporate actuarial, financial, enterprise risk management and legal staff support.
    Our business approach is focused on meeting the needs of our customers, maintaining a high quality balance sheet, and allocating capital to our best opportunities. New businesses are started when opportunities are identified and when the right talent and expertise are found to lead a business. Of our 5960 businesses, 5253 have been organized and developed internally and seven have been added through acquisition.
    Net premiums written, as reported based on United States generally accepted accounting principles (“GAAP”), for each of our reporting segments for each of the past three years were as follows:
Year Ended December 31,
Year Ended December 31,
Year Ended December 31,
Year Ended December 31,
(In thousands)(In thousands)202220212020
Net premiums written:
Net premiums written:
Net premiums written:Net premiums written:
InsuranceInsurance$8,784,146 $7,743,814 $6,347,101 
Insurance
Insurance
Reinsurance & Monoline ExcessReinsurance & Monoline Excess1,219,924 1,119,053 915,336 
Reinsurance & Monoline Excess
Reinsurance & Monoline Excess
Total
Total
TotalTotal$10,004,070 $8,862,867 $7,262,437 
Percentage of net premiums written:Percentage of net premiums written:
Percentage of net premiums written:
Percentage of net premiums written:
Insurance
Insurance
InsuranceInsurance87.8 %87.4 %87.4 %
Reinsurance & Monoline ExcessReinsurance & Monoline Excess12.2 12.6 12.6 
Reinsurance & Monoline Excess
Reinsurance & Monoline Excess
TotalTotal100.0 %100.0 %100.0 %
Total
Total
Thirty-two of our insurance company subsidiaries are rated by A.M. Best Company, Inc. ("A.M. Best") and have financial strength ratings of A+ (Superior) (the second highest rating out of 15 possible ratings). A.M. Best's ratings are based upon factors of concern to policyholders, insurance agents and brokers and are not directed toward the protection of investors. A.M. Best states: “A Best's Financial Strength Rating (FSR) is an independent opinion of an insurer's financial strength and ability to meet its ongoing insurance policy and contract obligations. An FSR is not assigned to specific insurance policies or contracts and does not address any other risk.” A.M. Best reviews its ratings on a periodic basis, and its ratings of the Company's subsidiaries are therefore subject to change.
Our twenty-three insurance company subsidiaries rated by Standard & Poor's (“S&P”) have financial strength ratings of A+ (the seventhfifth highest rating out of twenty-seven possible ratings).
Our Moody's financial strength ratings are A1 for Berkley Insurance Company, Berkley Regional Insurance Company and Admiral Insurance Company (the fifth highest rating out of twenty-one possible ratings).
Our twenty-five insurance company subsidiaries rated by Fitch Ratings ("Fitch") have insurer financial strength ratings of AA- (the fourth highest rating out of twenty-seven possible ratings).
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The following sections describe our reporting segments and their businesses in greater detail. These businesses underwrite on behalf of one or more affiliated insurance companies within the group. The businesses are identified for descriptive purposes only and are not legal entities, but for marketing purposes may sometimes be referred to individually as "a Berkley company" or collectively as "Berkley companies." Unless otherwise indicated, all references in this Form 10-K to “Berkley,” “we,” “us,” “our,” the “Company” or similar terms refer to W. R. Berkley Corporation together with its subsidiaries and businesses. W. R. Berkley Corporation is a Delaware corporation formed in 1970.
Insurance
Our U.S.-basedInsurance businesses underwrite predominantly underwrite commercial and specialty personal lines insurance business primarily throughout the United States, although manyStates. Many units offer coverage globally, focusingwhile others specialize in specific international markets. The Insurance businesses focus on the following general areas:
Excess & Surplus Lines: A number of our businesses are dedicated to the U.S. excess and surplus lines market. They serve a diverse group of customers that often have complex risk or unique exposures that typically fall outside the underwriting guidelines of the standard insurance market. Lines of business underwritten by our excess and surplus lines businesses include premises operations, commercial automobile,auto, property, products liability, general liability and professional liability lines. Products are generally distributed through wholesale agents and brokers.
Industry Specialty: Certain other businesses focus on providing specialty coverages to customers within a particular industry that are best served by underwriters and claims professionals with specialized knowledge of that industry. They offer multiple lines of business with policies tailored to address the unique exposures of these industries, often with the flexibility of providing coverages on either an admitted or a non-admitted basis in the U.S., as well as internationally. Each business delivers its products through one or more distribution channels, including retail and wholesale agents, brokers, and managing general agents (MGAs), depending on the customer and the particular risks insured.
Product Specialty: Other businesses specialize in providing specific lines of insurance coverage, such as workers’ compensation or professional liability, to a wide range of customers. They offer insurance products, analytical tools and risk management services such as loss control and claims management that enable clients to manage their risk appropriately. Business is typically written on an admitted basis, although some businesses may offer non-admitted products in the U.S. and offer products internationally. Independent agents and brokers are the primary means of distribution.
Regional: Certain businesses offer standard insurance products and services focused on meeting the specific needs of a geographically differentiated customer base. Key clients are small-to-midsized businesses. These regionally focused businesses provide a broad array of commercial insurance products to customers primarily in 45 states and the District of Columbia and have developed expertise in niches that reflect local economies. They are organized geographically in order to provide them with the flexibility to adapt quickly to local market conditions and customer needs.
In addition, through our non-U.S. insurance businesses, we write business in more than 60 countries worldwide, with branches or offices in 43 cities outside the United States, in Asia, Australia, Canada, Continental Europe, Mexico, Scandinavia, South America and the United Kingdom. In each of our operating territories, we have built decentralized structures that allow products and services to be tailored to each regional customer base. Our businesses are managed by teams of professionals with expertise in local markets and knowledge of regional environments.
In addition to providing insurance products, certain businesses also provide a wide variety of fee-based services, including claims, administrative and consulting services.
Businesses comprising the Insurance segment are as follows:
Acadia Insurance is a Northeast regional property casualty underwriter offering a broad portfolio of products exclusively through local independent agents in Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island and Vermont. In addition to its general offerings, Acadia has specialized expertise in insuring regional industries such as construction, service contractors, lumber, and transportation.
Admiral Insurance provides excess and surplus lines coverage for commercial risks that generally consist of hard-to- place, specialized risks that involve moderate to high degrees of hazard. In both general liability and professional lines, Admiral has a broad line of products to meet the needs of existing as well as emerging opportunities. The distribution of products is limited solely to wholesale brokers.
Berkley Accident and Health underwrites accident and health insurance and reinsurance products in four primary areas: medical stop loss, managed care, special risk and group captive. It has a diversified product and service portfolio serving a range of clients from small employers, health care organizations, and membership groups to Fortune 500 companies.
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Berkley Agribusiness offers insurance for larger commercial risks across the United States involved in the supply, storage, handling, processing and distribution of commodities related to the agriculture and food industries.     
Berkley Alliance Managers offers tailored insurance coverages and comprehensive risk management solutions designed to enhance profitability and reduce susceptibility to loss in four target markets - Design Professionals, Construction Professionals, Accounting Professionals and miscellaneous non-medical Service Professionals.
Berkley Aspire provides excess and surplus lines coverage on a national basis to small to medium-sized insureds with low to moderate insurance risk. Its product lines include general liability, liquorexcess liability and some property and inland marine coverage. It serves a limited distribution channel, including select Berkley business agents.
Berkley Asset Protection provides specialized insurance coverages for fine arts and jewelry exposures to commercial and individual clients.
Berkley Canada underwrites specialty, casualty and surety lines of business on behalf of the Canadian branch of Berkley Insurance Company. It specializes in commercial casualty and professional liability, and offers a broad portfolio of risk products that include commercial general liability, umbrella, professional liability, directors and officers, commercial property and surety, in addition to niche products for specific industries such as technology, life sciences and travel.
Berkley Construction Solutions provides excess liability coverage to residential and commercial contractors on a project or practice basis.
Berkley Custom Insurance focuses on the excess casualty insurance market and offers umbrella and excess liability coverages to clients from the small/middle market to Fortune 1000 companies in target classes of business including construction, manufacturing, retail/wholesale trade, finance, real estate, public entities and oil & gas.
Berkley Cyber Risk Solutions focuses on insurance and risk management products that respond to the changing cyber security vulnerabilities of organizations around the world. It offers specialty commercial cyber insurance coverages on a worldwide basis to clients of all sizes.
Berkley E&S Solutions provides general liability excess and surplus lines coverages for mid-market U.S. companies with generally hard-to-place, specialized risks that involve moderate to high degrees of hazard and require tailored terms, primarily utilizing self-insurance retentions. The distribution of products is highly limited to a small number of individually appointed wholesale brokers.
Berkley Enterprise Risk Solutions provides custom workers' compensation programs to large motivated employers operating in a broad range of industries. Loss sensitive and/or guaranteed cost programs are offered to employers with exposure predominately in California.
Berkley Entertainment underwrites property casualty insurance products, both on an admitted and non-admitted basis, for clients in the entertainment industry and sports-related organizations.
Berkley Environmental underwrites casualty and specialty environmental products for environmental customers including contractors, consultants, property owners and facilities operators.
Berkley Financial Specialists serves the insurance needs of companies predominantly in the financial services sector and beyond.sector. Its Berkley Crime division provides crime and fidelity related insurance products for commercial organizations, financial sector businesses and governmental entities on a primary and excess basis. Its Financial Services segment provides management liability and fidelity products to financial institutions, insurance companies and asset management firms.
Berkley Fire & Marine offers a broad range of preferred inland marine and related property risks and services to customers throughout the United States. Products are distributed through independent agents and brokers.
Berkley Healthcare underwrites customized, comprehensive insurance solutions for the full spectrum of healthcare providers. Through Berkley Healthcare Medical Professional, it offers a wide range of medical professional coverages. Through Berkley Healthcare Financial Lines, it offers a comprehensive suite of financial lines coverages.
Berkley Human Services provides property casualty insurance coverages to human services organizations, including nonprofit and for-profit organizations. Its product offerings include traditional primary and excess coverages.
Berkley Industrial Comp specializes in writing workers' compensation insurance for diverse high hazard industries in select states. Its products are distributed by a select group of independent retail agents.agents and wholesale brokers.
Berkley Insurance Asia underwrites specialty commercial insurance coverages to clients in North Asia and Southeast Asia through offices in Hong Kong, Singapore, Labuan and Shanghai.
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Berkley Insurance Australia underwrites general insurance business in Australia, including professional indemnity insurance for companies of all sizes.
Berkley Latinoamérica provides property, casualty, automobile,auto, surety, group life and workers' compensation products and services in its operating territories of Argentina, Brazil, the Caribbean, Colombia, Mexico and Uruguay.
Berkley Life Sciences offers a comprehensive spectrum of property casualty products to the life sciences industry on a global basis, including both primary and excess product liability coverages. It serves pharmaceutical and biotech companies, medical device companies, dietary supplement companies, medical and research related software developers, contract research and manufacturing organizations, research institutions and organizations, and other related businesses.
Berkley Luxury Group provides commercial package insurance programs for high-end cooperative, condominium, and quality rental apartment buildings and upscale restaurants in the New York, New Jersey, Chicago and Washington, D.C. metropolitan markets, as well as other select markets.
Berkley Management Protection offers a modular suite of management liability products for small and middle market companies through a bespoke and easy to use platform tailored to independent agents. The management liability coverages they provide include directors and officers, employment practices, fiduciary, cyber, crime and miscellaneous professional liability.
Berkley Mid-Atlantic Group provides commercial property casualty coverages to a wide variety of businesses in Delaware, the District of Columbia, Maryland, Ohio, Pennsylvania, and Virginia. Focusing on small and middle market accounts, it complements its standard writings with specialized products in areas such as construction.
Berkley Net Underwriters focuses on small and medium-sized commercial risks, using a web-based system to allow producers to quote, bind and service workers' compensation insurance products on behalf of Berkley member insurance companies.
Berkley North Pacific offers preferred insurance products and services to a broad range of small to medium size commercial entities. It operates through independent agents in Idaho, Montana, Oregon, Utah and Washington.
Berkley Offshore Underwriting Managers is a specialist global underwriter of energy and marine risks. Its three divisions provide specialty insurance products in the energy upstream, energy liability and marine sectors.    
Berkley Oil & Gas provides property casualty products and risk services to the United States energy sector. Its customer base includes risks of all sizes that work in the oil patch, including operators, drillers, geophysical contractors, well-servicing contractors, and manufacturers/distributors of oil field products, as well as those in the renewable energy sector.    
Berkley One provides a customizable suite of personal lines insurance solutions including home, condo/co-op, auto, fine art and collectibles, liability, collector vehicle and collectibles.recreational marine. Berkley One targets high net worth individuals and families with sophisticated risk management needs.
Berkley Product Protection offers a broad product suite, including Product Liabilityproduct liability and Product Recallproduct recall and Contamination, to assist clients in the manufacturing, wholesale and import space with their risk management and insurance needs.
Berkley Professional Liability specializes in professional liability insurance for publicly-traded and private entities on a worldwide basis. Its liability coverages include directors and officers, errors and omissions, fiduciary, employment practices, and sponsored insurance agents' errors and omissions. Berkley Transactional, a division of Berkley Professional Liability, underwrites a full suite of transactional insurance products, including representations and warranties insurance, and tax opinion insurance.
Berkley Program Specialists is a program management companybusiness offering both admitted and non-admitted insurance support on a nationwide basis for commercial casualty and property program administrators with specialized insurance expertise. Its book is built around blocks of homogeneous business or programs, allowing for efficient processes, effective oversight of existing programs and sound implementation of new programs.    
Berkley Public Entity specializes in providing excess coverage and services to individual governmental and scholastic entities and intergovernmental risk sharing groups. Products include general liability, automobileauto liability, law enforcement liability, public officials and educator's legal liability, employment practices liability, incidental medical, property and crime.
Berkley Risk provides at-risk and alternative risk insurance program management services for a broad range of groups and individuals including public entity pools, professional associations, captives and self-insured clients. As a third party administrator, it manages workers’ compensation, liability and property claims nationwide.
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Berkley Select specializes in underwriting professional liability insurance for law firms and accounting firms, as well as other professional firms and their practices. It also offers executive liability products, including directors and officers liability, employment practices and fiduciary liability, to small to middle market privately held and not-for-profit customers. Berkley Select provides these insurance products on both an admitted and surplus lines basis.    
Berkley Small Business Solutions offers commercial insurance products for small businesses through a modern technology platform that leverages data and analytics. Its initial product offering focuses on preferred risks in the non-fleet transportation market.
Berkley Southeast offers a wide array of commercial lines products in six southeastern states: Alabama, Georgia, Mississippi, North Carolina, South Carolina and Tennessee, specializing in small to mid-sized accounts.
Berkley Specialty Excess provides excess and surplus lines coverages for hard-to-place risks involved in moderate to high degrees of hazard. It focuses on highly specialized risk exposures within specific industry verticals such as the environmental and energy industries. Its predominate focus is on providing excess insurance; however, in some cases it provides highly specialized environmental primary products tailored to the individual risk. Products are distributed through a minimal number of insurance brokers and agents that specialize in these industry verticals.
Berkley Surety provides a full spectrum of surety bonds for construction, environmental and commercial surety accounts in the U.S. and Canada, through an independent agency and broker platform across 2019 field locations.    
Berkley Technology Underwriters provides a broad range oftechnology error & omission (TE&O) and first party cyber coverage along with traditional package, umbrella and third-party insurance programsworker's compensation products. TE&O and cyber products provide industry specialization for both domestic and foreign technology, exposuresgovernment contracting, telecommunications, digital media, manufacturing and technology industries on both a local and global basis.private equity firms.
Carolina Casualty is a national provider of primary commercial insurance products and services to the transportation industry. It underwrites on an admitted basis in all 50 states and the District of Columbia. Its Berkley Prime Transportation business provides primary auto liability, auto physical damage and general liability to a broad array of trucking operations.
Continental Western Group is a Midwest regional property and casualty insurance operation based in Des Moines, Iowa, providing underwriting and risk management services to a broad array of regional businesses in thirteen Midwest states. In addition to its generalist portfolio, Continental Western offers specialty underwriting solutions for diversified agriculture, construction, light manufacturing, transportation, volunteer fire departments, rural utilities and public entities.
Gemini Transportation is a national provider of excess liability insurance for various domestic surface transportation businesses, including the railroad industry as well as the trucking, busing and other industries that use rubber-wheeled vehicles for over-the-road use.
Intrepid Direct provides business insurance coverages through a direct distribution model focused on the franchise market, with specialties including the restaurant, garage and fitness industries.
Key Risk specializes in writing workers' compensation insurance for diverse industries including healthcare, human services, transportation, temporary staffing, professional employer organizations and contractors requiring coverage under the United States Longshore and Harbor Workers' Compensation Act (USL&H). Its products are distributed by a select group of independent retail agents and wholesale brokers located throughout the United States.
Nautilus Insurance Group insures excess and surplus lines risks for small to medium-sized commercial risks with low to moderate susceptibility to loss. It writes commercial excess and surplus lines business nationwide and admitted lines commercial business in a limited number of states. A substantial portion of Nautilus' business is written through its close, long-standing network of general agents, who are chosen on a highly selective basis.
Preferred Employers Insurance focuses exclusively on workers' compensation products and services for businesses based in California. It serves thousands of customers covering a broad spectrum of industries throughout the state.    
Union Standard offers preferred commercial property and casualty insurance products and services to a wide range of small to medium size commercial entities with a focus on the construction, farm/ranch, retail and service industries. It operates through independent agents in Arizona, Arkansas, New Mexico, Oklahoma and Texas.
Vela Insurance Services specializes in commercial casualty insurance on an excess and surplus lines basis. Its primary focus is on general liability insurance for construction, manufacturing and general casualty clients as well as products liability and miscellaneous professional liability coverages distributed through wholesale insurance brokers.
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Verus Specialty Insurance offers general liability,tailored casualty, professional liability, and propertygarage coverages, for small to mid-sized commercial risksspecializing in the excess and surplus lines insurance marketmarket. It primarily serves the construction, manufacturing, garage service and professional sectors through a select group of appointedselective wholesale brokers.broker network.
W R B Europe is comprised of specialist businesses offering a focused range of insurance products to markets in Continental Europe.
W / R / B Underwriting provides a broad range of insurance products to the Lloyd's marketplace, with a concentration in specialist classes of business including property, professional indemnity and financial lines.
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    The following table sets forth the percentage of gross premiums written by each Insurance business:
 Year Ended December 31,
 202220212020
Acadia Insurance5.2%5.5%6.0%
Admiral Insurance6.25.95.6
Berkley Accident and Health5.15.05.2
Berkley Agribusiness0.80.81.2
Berkley Alliance Managers2.72.82.8
Berkley Aspire0.90.70.5
Berkley Asset Protection1.00.80.8
Berkley Canada1.21.21.1
Berkley Construction Solutions0.4——
Berkley Custom Insurance3.13.23.5
Berkley Cyber Risk Solutions0.90.80.5
Berkley E&S Solutions——���
Berkley Enterprise Risk Solutions———
Berkley Entertainment1.81.82.1
Berkley Environmental5.65.25.4
Berkley Financial Specialists0.60.60.8
Berkley Fire & Marine0.70.80.8
Berkley Healthcare1.81.81.7
Berkley Human Services1.11.01.0
Berkley Industrial Comp0.70.80.8
Berkley Insurance Asia0.80.80.7
Berkley Insurance Australia1.71.71.4
Berkley Latinoamérica2.92.72.8
Berkley Life Sciences0.50.50.5
Berkley Luxury Group0.80.91.1
Berkley Management Protection0.1——
Berkley Mid-Atlantic Group1.01.31.2
Berkley Net Underwriters2.22.12.2
Berkley North Pacific0.70.70.7
Berkley Offshore Underwriting Managers1.41.51.5
Berkley Oil & Gas3.53.03.2
Berkley One1.81.20.7
Berkley Product Protection0.30.40.4
Berkley Professional Liability5.87.54.8
Berkley Program Specialists1.72.01.7
Berkley Public Entity0.60.60.5
Berkley Risk0.30.20.3
Berkley Select1.82.02.4
Berkley Small Business Solutions———
Berkley Southeast2.22.32.3
Berkley Surety1.11.11.2
Berkley Technology Underwriters0.60.60.7
Carolina Casualty2.11.70.9
Continental Western Group2.42.52.8
Gemini Transportation3.13.03.4
Intrepid Direct1.21.10.9
Key Risk2.22.52.5
Nautilus Insurance Group4.74.54.9
Preferred Employers Insurance1.21.51.9
Union Standard1.51.72.0
Vela Insurance Services2.52.62.6
Verus Specialty Insurance0.80.80.7
W R B Europe1.01.11.0
W/R/B Underwriting3.64.04.3
Other2.11.22.0
Total100.0%100.0%100.0%
 Year Ended December 31,
 202320222021
Acadia Insurance5.3%5.2%5.5%
Admiral Insurance7.06.25.9
Berkley Accident and Health5.35.15.0
Berkley Agribusiness0.80.80.8
Berkley Alliance Managers2.32.72.8
Berkley Aspire1.20.90.7
Berkley Asset Protection0.91.00.8
Berkley Canada1.01.21.2
Berkley Construction Solutions0.60.4—
Berkley Custom Insurance2.93.13.2
Berkley Cyber Risk Solutions0.80.90.8
Berkley E&S Solutions0.1——
Berkley Enterprise Risk Solutions0.1——
Berkley Entertainment1.71.81.8
Berkley Environmental6.65.65.2
Berkley Financial Specialists0.60.60.6
Berkley Fire & Marine0.90.70.8
Berkley Healthcare1.51.81.8
Berkley Human Services1.31.11.0
Berkley Industrial Comp0.70.70.8
Berkley Insurance Asia0.80.80.8
Berkley Insurance Australia1.61.71.7
Berkley Latinoamérica3.22.92.7
Berkley Life Sciences0.50.50.5
Berkley Luxury Group0.70.80.9
Berkley Management Protection0.20.1—
Berkley Mid-Atlantic Group0.91.01.3
Berkley Net Underwriters1.92.22.1
Berkley North Pacific0.70.70.7
Berkley Offshore Underwriting Managers1.51.41.5
Berkley Oil & Gas3.03.53.0
Berkley One2.61.81.2
Berkley Product Protection0.30.30.4
Berkley Professional Liability3.85.87.5
Berkley Program Specialists0.91.72.0
Berkley Public Entity0.70.60.6
Berkley Risk0.30.30.2
Berkley Select1.81.82.0
Berkley Small Business Solutions0.2——
Berkley Southeast2.32.22.3
Berkley Specialty Excess0.2——
Berkley Surety1.11.11.1
Berkley Technology Underwriters0.60.60.6
Carolina Casualty2.12.11.7
Continental Western Group2.62.42.5
Gemini Transportation3.03.13.0
Intrepid Direct1.51.21.1
Key Risk2.12.22.5
Nautilus Insurance Group4.74.74.5
Preferred Employers Insurance1.01.21.5
Union Standard1.31.51.7
Vela Insurance Services2.62.52.6
Verus Specialty Insurance1.00.80.8
W R B Europe1.11.01.1
W/R/B Underwriting3.93.64.0
Other1.72.12.11.2
Total100.0%100.0%100.0%
1113


    The following table sets forth percentages of gross premiums written, by line, by our Insurance operations:
Year Ended December 31,
202220212020
Year Ended December 31,
Year Ended December 31,
Year Ended December 31,
2023
Other liability
Other liability
Other liabilityOther liability37.0%35.6%36.0%
Short-tail lines (1)Short-tail lines (1)23.222.223.3
Short-tail lines (1)
Short-tail lines (1)
Professional liabilityProfessional liability15.517.314.6
Professional liability
Professional liability
Auto
Auto
Auto
Workers' compensationWorkers' compensation11.712.414.3
Commercial auto12.612.511.8
Workers' compensation
Workers' compensation
Total Total100.0%100.0%100.0%
Total
Total
___________________
(1)Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler    and machinery, high net worth homeowners and other lines.
Reinsurance & Monoline Excess
We provide other insurance companies and self-insureds with assistance in managing their net risk through reinsurance on either a portfolio basis, through treaty reinsurance, or on an individual basis, through facultative reinsurance. Our monoline excess operations solely retain risk on an excess basis.
Businesses comprising the Reinsurance & Monoline Excess segment are as follows:
Berkley Re America provides treaty and facultative reinsurance solutions on a variety of product lines through reinsurance brokers to companies whose primary operations are within the United States and Canada.
Berkley Re Asia Pacific provides property and casualty reinsurance to the Asia Pacific marketplace. With offices in Brisbane, Sydney, Beijing, Labuan and Singapore, each branch focuses on excess of loss reinsurance, targeting both property and casualty treaty and facultative contracts, through multiple distribution channels.
Berkley Re Solutions is a direct casualty facultative reinsurance underwriter serving clients through a nationwide network of regional offices. Its facultative reinsurance products include automatic, semi-automatic and individual risk assumed reinsurance. It also provides its customers with turnkey products such as cyber, employment practices liability insurance ("EPLI"), liquor liability insurance and violent events coverage to help enhance their clients' product offerings, along with underwriting, claims, and actuarial consultation.
Berkley Re UK writes international property casualty treaty and property facultative accounts. Its territorial scope includes reinsured clients domiciled in the United Kingdom, Europe, Africa, the Middle East and the Caribbean.
Lloyd's Syndicate 2791 Participation represents the Company's minority participation in a Lloyd's syndicate that writes a broad range of mainly short-tail classes of business.
Midwest Employers Casualty provides excess workers' compensation insurance products to individual employers, groups and workers' compensation insurance companies across the United States. Its workers' compensation excess of loss products include self-insured excess of loss coverages and large deductible policies. Through its relationship with Berkley Net Underwriters, Midwest Employers Casualty also offers multi-state coverage for group self-insureds. It has developed sophisticated, proprietary analytical tools and risk management services designed to help its insureds lower their total cost of risk.

1214


The following table sets forth the percentages of gross premiums written by each Reinsurance & Monoline Excess business:
Year Ended December 31,Year Ended December 31,
202220212020
Berkley Re AmericaBerkley Re America34.6%31.2%31.6%
Berkley Re America
Berkley Re America
Berkley Re Asia Pacific
Berkley Re Asia Pacific
Berkley Re Asia PacificBerkley Re Asia Pacific15.615.413.5
Berkley Re SolutionsBerkley Re Solutions12.513.814.4
Berkley Re Solutions
Berkley Re Solutions
Berkley Re UK
Berkley Re UK
Berkley Re UKBerkley Re UK12.813.814.7
Lloyd's Syndicate 2791 ParticipationLloyd's Syndicate 2791 Participation6.16.86.0
Lloyd's Syndicate 2791 Participation
Lloyd's Syndicate 2791 Participation
Midwest Employers Casualty
Midwest Employers Casualty
Midwest Employers CasualtyMidwest Employers Casualty18.419.019.8
TotalTotal100.0%100.0%100.0%
Total
Total

The following table sets forth the percentages of gross premiums written, by line, by our Reinsurance & Monoline Excess operations:
Year Ended December 31,Year Ended December 31,
202220212020
CasualtyCasualty61.7%61.8%58.1%
Casualty
Casualty
Property
Property
PropertyProperty19.919.222.1
Monoline ExcessMonoline Excess18.419.019.8
Monoline Excess
Monoline Excess
Total Total100.0%100.0%100.0%
Total
Total

Results by Segment
Summary financial information about our segments is presented on a GAAP basis in the following table:
Year Ended December 31,Year Ended December 31,
(In thousands)
(In thousands)
202220212020
InsuranceInsurance  
Insurance
Insurance
Revenue
Revenue
RevenueRevenue$8,952,493 $7,578,592 $6,478,834 
Income before income taxesIncome before income taxes1,455,658 1,219,798 668,012 
Income before income taxes
Income before income taxes
Reinsurance & Monoline Excess
Reinsurance & Monoline Excess
Reinsurance & Monoline ExcessReinsurance & Monoline Excess
RevenueRevenue1,386,639 1,203,647 1,009,203 
Revenue
Revenue
Income before income taxes
Income before income taxes
Income before income taxesIncome before income taxes316,527 270,563 205,587 
Other (1)Other (1)
Other (1)
Other (1)
Revenue
Revenue
RevenueRevenue827,367 673,227 610,888 
Loss before income taxesLoss before income taxes(52,504)(207,456)(168,797)
Loss before income taxes
Loss before income taxes
Total
Total
TotalTotal
RevenueRevenue$11,166,499 $9,455,466 $8,098,925 
Revenue
Revenue
Income before income taxesIncome before income taxes$1,719,681 $1,282,905 $704,802 
Income before income taxes
Income before income taxes

(1)Represents corporate revenues and expenses, net investment gains and losses, and revenues and expenses from non-insurance businesses that are consolidated for financial reporting purposes.
    





1315


The table below represents summary underwriting ratios on a GAAP basis for our segments. Loss ratio is losses and loss expenses incurred expressed as a percentage of net premiums earned. Expense ratio is underwriting expenses expressed as a percentage of net premiums earned. Underwriting expenses do not include expenses related to insurance services or unallocated corporate expenses. Combined ratio is the sum of the loss ratio and the expense ratio. The combined ratio represents a measure of underwriting profitability, excluding investment income. A number in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit:
Year Ended December 31,Year Ended December 31,
202220212020
InsuranceInsurance  
Insurance
Insurance
Loss ratio
Loss ratio
Loss ratioLoss ratio61.3 %61.1 %64.9 %
Expense ratioExpense ratio27.9 28.3 30.3 
Expense ratio
Expense ratio
Combined ratio
Combined ratio
Combined ratioCombined ratio89.2 %89.4 %95.2 %
Reinsurance & Monoline ExcessReinsurance & Monoline Excess
Reinsurance & Monoline Excess
Reinsurance & Monoline Excess
Loss ratio
Loss ratio
Loss ratioLoss ratio61.3 %61.0 %61.3 %
Expense ratioExpense ratio28.4 29.7 31.8 
Expense ratio
Expense ratio
Combined ratio
Combined ratio
Combined ratioCombined ratio89.7 %90.7 %93.1 %
TotalTotal
Total
Total
Loss ratio
Loss ratio
Loss ratioLoss ratio61.3 %61.1 %64.5 %
Expense ratioExpense ratio28.0 28.5 30.4 
Expense ratio
Expense ratio
Combined ratioCombined ratio89.3 %89.6 %94.9 %
Combined ratio
Combined ratio

Investments
Investment results, before income taxes, were as follows:
Year Ended December 31,Year Ended December 31,
(In thousands) (In thousands) 202220212020
Average investments, at cost (1)Average investments, at cost (1)$24,438,112 $22,234,975 $20,012,182 
Average investments, at cost (1)
Average investments, at cost (1)
Net investment income (1)
Net investment income (1)
Net investment income (1)Net investment income (1)$779,185 $671,618 $583,821 
Percent earned on average investments (1)Percent earned on average investments (1)3.2 %3.0 %2.9 %
Percent earned on average investments (1)
Percent earned on average investments (1)
Net investment gainsNet investment gains$202,397 $90,632 $103,000 
Change in unrealized investment (losses) gains (2)$(1,248,128)$(254,939)$164,645 
Net investment gains
Net investment gains
Change in unrealized investment gains (losses) (2)
Change in unrealized investment gains (losses) (2)
Change in unrealized investment gains (losses) (2)

(1)Includes investments, cash and cash equivalents, trading accounts receivable (payable) from brokers and clearing organizations, trading account securities sold but not yet purchased and unsettled purchases.
(2)Represents the change in unrealized investment gains (losses) gains for available for sale securities recognized in stockholders' equity.
For comparison, the following are the coupon returns for the Barclays U.S. Aggregate Bond Index and the dividend returns for the S&P 500® Index:
Year Ended December 31,Year Ended December 31,
202220212020
Barclays U.S. Aggregate Bond IndexBarclays U.S. Aggregate Bond Index2.7 %2.3 %2.8 %
Barclays U.S. Aggregate Bond Index
Barclays U.S. Aggregate Bond Index
S&P 500® Index
S&P 500® Index
1.3 1.8 1.8 
S&P 500® Index
S&P 500® Index
    
The percentages of the fixed maturity portfolio categorized by contractual maturity, based on fair value, on the dates indicated, are set forth below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay certain obligations.
1416


Year Ended December 31,Year Ended December 31,
202220212020
1 year or less1 year or less8.7%9.5%11.4%
1 year or less
1 year or less
Over 1 year through 5 years
Over 1 year through 5 years
Over 1 year through 5 yearsOver 1 year through 5 years47.246.138.9
Over 5 years through 10 yearsOver 5 years through 10 years23.425.225.0
Over 5 years through 10 years
Over 5 years through 10 years
Over 10 years
Over 10 years
Over 10 yearsOver 10 years11.212.717.4
Mortgage-backed securitiesMortgage-backed securities9.56.57.3
Mortgage-backed securities
Mortgage-backed securities
TotalTotal100.0%100.0%100.0%
Total
Total

At botheach of December 31, 20222023 and 2021,2022, the fixed maturity portfolio, including cash and cash equivalents, had an effective duration of 2.4 years.
Loss and Loss Expense Reserves
To recognize liabilities for unpaid losses, either known or unknown, insurers establish reserves, which is a balance sheet account representing estimates of future amounts needed to pay claims and related expenses with respect to insured events which have occurred. Estimates and assumptions relating to reserves for losses and loss expenses are based on complex and subjective judgments, often including the interplay of specific uncertainties with related accounting and actuarial measurements. Such estimates are also susceptible to change as significant periods of time may elapse between the occurrence of an insured loss, the report of the loss to the insurer, the ultimate determination of the cost of the loss and the insurer’s payment of that loss.
In general, when a claim is reported, claims personnel establish a “case reserve” for the estimated amount of the ultimate payment based upon known information about the claim at that time. The estimate represents an informed judgment based on general reserving practices and reflects the experience and knowledge of the claims personnel regarding the nature and value of the specific type of claim. Reserves are also established on an aggregate basis to provide for losses incurred but not reported (“IBNR”) to the insurer, potential inadequacy of case reserves and the estimated expenses of settling claims, including legal and other fees and general expenses of administrating the claims adjustment process. Reserves are established based upon the then current legal interpretation of coverage provided.
In examining reserve adequacy, several factors are considered in estimating the ultimate economic value of losses. These factors include, among others, historical data, legal developments, changes in social attitudes and economic conditions, including the effects of inflation. The actuarial process relies on the basic assumption that past experience, adjusted judgmentally for the effects of current developments and anticipated trends, is an appropriate basis for predicting future outcomes. Reserve amounts are necessarily based on management’s informed estimates and judgments using currently available data. As additional experience and other data become available and are reviewed, these estimates and judgments may be revised. This may result in reserve increases or decreases that would be reflected in our results in periods in which such estimates and assumptions are changed.
The risk and complexity of estimating loss reserves are greater when economic conditions are uncertain. It is especially difficult to estimate the impact of inflation on loss reserves given the current economic environment and related government actions. Whereas a slowing economy would generally lead to lower inflation or even deflation, increased government spending would generally lead to higher inflation. A change in our assumptions regarding inflation would result in reserve increases or decreases that would be reflected in our earnings in periods in which such assumptions are changed.
Reserves do not represent an exact calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claim administration will cost. While the methods for establishing the reserves are well tested over time, some of the major assumptions about anticipated loss emergence patterns are subject to unanticipated fluctuation. These estimates, which generally involve actuarial projections, are based on management’s assessment of facts and circumstances then known, as well as estimates of trends in claims severity and frequency, judicial theories of liability and other factors, including the actions of third parties, which are beyond the Company’s control. These variables are affected by external and internal events, such as inflation and economic volatility, judicial and litigation trends, reinsurance coverage, legislative changes and claim handling and reserving practices, which make it more difficult to accurately predict claim costs. The inherent uncertainties of estimating reserves are greater for certain types of liabilities where long periods of time elapse before a definitive determination of liability is made. Although the loss reserves included in the Company’s financial statements represent management’s best estimates, setting reserves is inherently uncertain and the Company cannot provide assurance that its current reserves will prove adequate in light of subsequent events.
1517


The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,267$1,352 million and $1,387$1,464 million at December 31, 20222023 and 2021,2022, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $416$390 million and $452$416 million at December 31, 20222023 and 2021,2022, respectively. At December 31, 2022,2023, discount rates by year ranged from 0.7% to 6.5%, with a weighted average discount rate of 3.4%3.5%.
Substantially all discounted workers’ compensation reserves (97% of total discounted reserves at December 31, 2022)2023) are excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.  
The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at December 31, 2022)2023), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates permitted by the Department of Insurance of the State of Delaware.
To date, known environmental and asbestos claims have not had a material impact on the Company’s operations, because its subsidiaries generally did not insure large industrial companies that are subject to significant environmental or asbestos exposures prior to 1986 when an absolute exclusion was incorporated into standard policy language.
The Company’s net reserves for losses and loss expenses relating to environmental and asbestos claims on policies written before adoption of the absolute exclusion was $17 million and $20 million at both December 31, 2023 and 2022, and 2021.respectively. The estimation of these liabilities is subject to significantly greater than normal variation and uncertainty because it is difficult to make an actuarial estimate of these liabilities due to the absence of a generally accepted actuarial methodology for these exposures and the potential effect of significant unresolved legal matters, including coverage issues, as well as the cost of litigating the legal issues. Additionally, the determination of ultimate damages and the final allocation of such damages to financially responsible parties are highly uncertain.
The table below provides a reconciliation of the beginning of year and end of year property casualty reserves for the indicated years:
(In thousands)202220212020
Net reserves at beginning of year$12,848,362 $11,620,393 $10,697,998 
Cumulative effect adjustment resulting from changes in accounting principles (1)— — 5,927 
Restated net reserves at beginning of period12,848,362 11,620,393 10,703,925 
Net provision for losses and loss expenses:
Claims occurring during the current year (2)5,774,713 4,921,191 4,432,937 
Increase in estimates for claims occurring in prior years (3)54,511 863 627 
Loss reserve discount amortization32,526 31,906 35,142 
Total5,861,750 4,953,960 4,468,706 
  Net payments for claims:
Current year1,068,577 887,896 921,054 
Prior years3,279,333 2,777,798 2,677,595 
Total4,347,910 3,665,694 3,598,649 
Foreign currency translation(113,323)(60,297)46,411 
Net reserves at end of year14,248,879 12,848,362 11,620,393 
Ceded reserves at end of year2,762,344 2,542,526 2,164,037 
Gross reserves at end of year$17,011,223 $15,390,888 $13,784,430 
Net change in premiums and losses occurring in prior years:
Increase in estimates for claims occurring in prior years (3)$(54,511)$(863)$(627)
Retrospective premium adjustments for claims occurring in prior years (4)18,106 7,510 16,807 
Net premium and reserve development on prior years$(36,405)$6,647 $16,180 
(In thousands)202320222021
Net reserves at beginning of year$14,248,879 $12,848,362 $11,620,393 
Net provision for losses and loss expenses:
Claims occurring during the current year (1)6,311,780 5,774,713 4,921,191 
Increase in estimates for claims occurring in prior years (2)29,681 54,511 863 
Loss reserve discount amortization30,681 32,526 31,906 
Total6,372,142 5,861,750 4,953,960 
  Net payments for claims:
Current year1,217,078 1,068,577 887,896 
Prior years3,764,532 3,279,333 2,777,798 
Total4,981,610 4,347,910 3,665,694 
Foreign currency translation22,409 (113,323)(60,297)
Net reserves at end of year15,661,820 14,248,879 12,848,362 
Ceded reserves at end of year3,077,832 2,762,344 2,542,526 
Gross reserves at end of year$18,739,652 $17,011,223 $15,390,888 
Net change in premiums and losses occurring in prior years:
Increase in estimates for claims occurring in prior years (2)$(29,681)$(54,511)$(863)
Retrospective premium adjustments for claims occurring in prior years (3)10,782 18,106 7,510 
Net premium and reserve development on prior years$(18,899)$(36,405)$6,647 

____________________________________
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(1)The cumulative effect adjustment resulting from changes in accounting principles relates to the allowance for expected credit losses on reinsurance recoverables that commenced on January 1, 2020 due to the adoption of ASU 2016-13.
(2)Claims occurring during the current year are net of loss reserve discounts of $47 million, $35 million and $21 million in 2023, 2022 and $10 million in 2022, 2021, and 2020, respectively.
(3)(2)The change in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $13 million in 2023, increased by $16 million in 2022, and decreased by $19 million in 2021 and $21 million in 2020, respectively.2021.
(4)(3)For certain retrospectively rated insurance policies and reinsurance agreements, changes in loss and loss expenses for prior years are offset by additional or return premiums.
    
Also, see Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and note 14,13, Reserves for Losses and Loss Expenses included in our audited consolidated financial statements for further information regarding the changes in estimates for claims occurring in prior years.
A reconciliation between the reserves as of December 31, 20222023 as reported in the accompanying consolidated GAAP financial statements and those reported on the basis of statutory accounting principles (“SAP”) in the Company’s U.S. regulatory filings is as follows:
(In thousands)
Net reserves reported in U.S. regulatory filings on a SAP basis$13,640,48914,954,598 
Reserves for non-U.S. companies679,246780,762 
Loss reserve discounting (1)(78,336)(80,832)
Ceded reserves2,762,3443,077,832 
Allowance for expected credit losses on due from reinsurers7,4807,292 
Gross reserves reported in the consolidated GAAP financial statements$17,011,22318,739,652 
_________________________
(1)For statutory purposes, the Company discounts its workers’ compensation reinsurance reserves at 2.5% as prescribed or permitted by the Department of Insurance of the State of Delaware. In its GAAP financial statements, the Company discounts excess workers’ compensation reserves at the risk-free rate and assumed workers’ compensation reserves at the statutory rate.
Reinsurance
We follow a common industry practice of reinsuring a portion of our exposures and paying to reinsurers a portion of the premiums received on the policies that we write. Reinsurance is purchased principally to reduce net liability on individual risks and to protect against catastrophic losses. Although reinsurance does not legally discharge an insurer from its primary liability for the full amount of the policies, it does make the assuming reinsurer contractually liable to the insurer to the extent of the reinsurance coverage. We monitor the financial condition of our reinsurers and attempt to place our coverages only with substantial, financially sound carriers. As a result, generally the reinsurers who reinsure our casualty insurance must have an A.M. Best rating of “A (Excellent)” or better with at least $1 billion in policyholder surplus and the reinsurers who cover our property insurance must have an A.M. Best rating of “A- (Excellent)” or better with at least $1 billion in policyholder surplus.

Regulation
U.S. Regulation 
Our U.S. insurance subsidiaries are principally regulated by their domiciliary state insurance departments and are subject to varying degrees of regulation and supervision in the other U.S. jurisdictions in which they do business. As of January 1, 2023,2024, there are six domiciliary states related to our U.S. insurance subsidiaries.

Overview. Our domestic insurance subsidiaries are subject to statutes which delegate regulatory, supervisory and administrative powers to state insurance commissioners. This regulation relates to such matters as the standards of solvency which must be met and maintained; the licensing of insurers and their agents; the nature of and limitations on investments; deposits of securities for the benefit of policyholders; approval of certain policy forms and premium rates; periodic examination of the affairs of insurance companies; annual and other reports required to be filed on the financial condition of insurers or for other purposes; establishment and maintenance of reserves for unearned premiums, loss expenses and losses; and requirements regarding numerous other matters. Our property casualty subsidiaries, other than our excess and surplus lines and reinsurance subsidiaries, must generally file all rates with the insurance department of each state in which they operate. Our excess and
17


surplus lines and reinsurance subsidiaries generally operate free of rate and form regulation.

19
Legislative and Regulatory Activity Related to the COVID-19 Pandemic.
In response to the outbreak of the COVID-19 pandemic in 2020, legislators in several states and in the United States Congress introduced proposals that would have mandated insurance coverage for certain pandemic-related losses, including business interruption losses, under previously-issued policies that were not designed or priced to provide such coverage. Federal lawmakers also discussed the possibility of a public-private partnership, and there appears to have been a broadly held and bipartisan consensus that pandemic risk is generally uninsurable absent some kind of publicly-funded backstop. While these state and federal proposals have not meaningfully progressed, there remains a risk that they might be revived, or that future variants of COVID-19 or concerns about the possibility of a future pandemic might prompt similar legislative and regulatory proposals. See “Risk Factors — Risks Related to Our Industry — The COVID-19 pandemic has materially and adversely affected our results of operations, and is expected to continue and therefore may materially and adversely affect our results of operations, financial position and liquidity.”

Holding Company Statutes. In addition to regulatory supervision of our insurance subsidiaries, we are subject to state statutes governing insurance holding company systems. Under the terms of applicable state statutes, any person or entity desiring to purchase more than a specified percentage (commonly 10%) of our outstanding voting securities would be required to obtain prior regulatory approval of the purchase. Typically, such statutes require that we periodically file information with the appropriate domiciliary state insurance commissioner, including information concerning our capital structure, ownership, financial condition and general business operations.
We must also annually submit to the lead state regulator for our group an “enterprise risk management report” which identifies the activities and circumstances of any affiliated company that might have a material adverse effect on the financial condition of our group or our U.S. licensed insurers.
In addition, all states have adopted changes to the holding company act that authorize U.S. insurance regulators to lead or participate in the group-wide supervision of certain international insurance groups. In November 2019, the International Association of Insurance Supervisors (“IAIS”), an international standard setter, adopted a global framework for the supervision of internationally active insurance groups (“IAIGs”), as discussed below under “International Regulation.” This framework includes a risk-based, group-wide global insurance capital standard (“ICS”), which is undergoing a five-year monitoring period that started in January 2020. We have received notice from Delaware, our lead state insurance regulator, that we may be considered an IAIG. In the event that we are deemed to be an IAIG, we would be subject to international oversight coordinated by the Delaware Department of Insurance.
In the United States, the National Association of Insurance Commissioners (the “NAIC”) has developed a group capital calculation tool that uses a risk-based capital aggregation methodology for all entities in an insurance holding company system. The goal is to provide U.S. regulators with a method to aggregate the available capital and the minimum capital of each entity in a group in a way that applies to all companies regardless of their structure. In 2020,2022, Delaware, our lead state regulator, adopted the NAIC adopted amendments to the model holding company act and regulation that implement the group capital calculation by requiringrequire the ultimate controlling person of an insurer subject to holding company registration to filesubmit the group capital calculation filing annually with its lead state regulator. The annual filing requirement will become effective once the states have adopted the NAIC holding company amendments. This annual filing requirement became effective in Delaware, our lead state insurance regulator, on February 7, 2022.
All states have adopted the NAIC's Risk Management and Own Risk and Solvency Assessment Model Act (the “ORSA Model Act”), which requires an insurance holding company system’s chief risk officer to submit annually to its lead state insurance regulator an Own Risk and Solvency Assessment Summary Report (“ORSA Report”). The ORSA Report is a confidential internal assessment of the material and relevant risks associated with an insurer’s current business plan and the sufficiency of capital resources to support those risks. Under the ORSA Model Act, as enacted by the states, we are required to:
•regularly, no less than annually, conduct an ORSAOwn Risk and Solvency Assessment to assess the adequacy of our risk management framework, and current and estimated projected future solvency position;
•internally document the process and results of the assessment; and
•provide an ORSA Report annually to the State of Delaware's Insurance Commissioner.
Cybersecurity Regulations. New York’s cybersecurity regulation applies to financial services institutions authorized by the New York State Department of Financial Services (the “NYDFS”), including our insurance subsidiaries licensed in New York. The regulation requires these entities to assess risks associated with their information systems and establish and maintain a cybersecurity program reasonably designed to protect consumers’ private data and the confidentiality, integrity and availability of the licensee’s information systems. InOn November 2022,1, 2023, the NYDFS proposedadopted amendments to New York’s cybersecurity regulation, which if adopted, would require additional reporting, governance and oversight measures, and enhanced cybersecurity safeguards to be implemented. The amendments take effect in phases that began in 2023 and continue through 2025.

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The NAIC has adopted the Insurance Data Security Model Law (the “Cybersecurity Model Law”) for consideration by state legislatures, which when adopted by the states, establishes standards for data security, the investigation of cybersecurity events involving the unauthorized access to, or the misuse of, certain nonpublic information, and reporting to insurance commissioners. The Cybersecurity Model Law imposes significant regulatory burdens intended to protect the confidentiality, integrity and availability of information systems. As of December 31, 2022,2023, the Cybersecurity Model Law, or a form thereof, had been adopted by several states, including three of our U.S. insurance subsidiaries’ domiciliary states. A drafting note in the Cybersecurity Model Law states that a licensee’s compliance with New York's cybersecurity regulation is intended to constitute compliance with the Cybersecurity Model Law, but compliance remains a state-by-state issue and we would need to considerrequiring consideration of any State differences in implementation and enforcement of the Cybersecurity Model Law as part of our compliance efforts. Additionally, the Federal Trade Commission amended the “Standards for Safeguarding Customer Information Rules (otherwise known as the “Safeguards Rule”) in 2021 to require covered financial institutions to implement certain data security measures and practices in their information security programs. Many of the requirements of the amended Safeguards Rule are similar to New York's cybersecurity regulation and the Cybersecurity Model Law, but there are some differences that may impose increased operational burdens and compliance costs. The amended Safeguards Rule will become effective in June 2023.Law.

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Certain other states have enacted or are also developing or have developedconsidering laws and regulations related to privacy and data security. For example, the California Consumer Privacy Act (“CCPA”), which became effective in January 2020, broadly regulates the collection, processing and disclosure of California residents’ personal information, imposes limits on the “sale” of personal information and grants California residents certain rights to, among other things, access and delete data about them in certain circumstances. The CCPA also established a private right of action, with potentially significant statutory damages, whereby businesses that fail to implement reasonable security measures to protect against breaches of personal information could be liable to affected California consumers. California subsequently enacted the California Privacy Rights Act (“CPRA”), which came into full effect in January 2023. The CPRA amends2023 and amended the CCPA by imposing additional limitations and obligations with respect to covered businesses’ use and sharing of certain personal data. Compliance with the CCPA/CPRA may increase the cost of providing our products and services in California. Other states have considered – and someAn increasing number of U.S. states have adopted, -or are considering legislation similar proposals. For instance, Virginia enactedto the CCPA.
Additionally, the NAIC is working on a data privacy lawnew Insurance Consumer Privacy Protections Model Law to
reflect the extensive innovations in 2021 that became effective in January 2023. Additionally, Colorado, Connecticutcommunications and Utah have enacted data privacy laws that will come into effect later in 2023. These laws establish in those states manytechnology since the adoption of the same data privacy and security requirements as other existing laws, such as the CCPA.prior model laws.
We cannot predict the impact, if any, that any current, proposed or future federal or state cybersecurity laws or regulations will have on our business, financial condition or results of operations.
Innovation and Technology. As a result of increased innovation and use of technology in the insurance sector, the NAIC and insurance regulators have been focusing on the use of “big data” techniques, such as artificial intelligence, machine learning and automated decision-making. In December 2023, the NAIC adopted the Model Bulletin on the Use of Artificial Intelligence Systems by Insurers (the “AI Bulletin”). The AI Bulletin may be adopted and issued by state regulators to licensed insurers. In addition to affirming that the use of artificial intelligence must comply with existing state law, the AI Bulletin sets forth regulators’ expectations on how insurers will develop, acquire and use artificial intelligence technologies. In 2024, the NAIC plans to form a new task force to create a regulatory framework for the oversight of insurers’ use of third-party data and models.
The NAIC and state insurance regulators are also focused on addressing unfair discrimination by insurers in the use of consumer data and technology, and certain states have passed laws or are considering action targeting unfair discrimination practices. For example, in 2021 Colorado enacted a law that prohibits insurers from using external consumer data and information sources (“ECDIS”), as well as algorithms or predictive models that use ECDIS, in a way that unfairly discriminates based on race, color, national or ethnic origin, religion, sex, sexual orientation, disability, gender identity or gender expression. In August 2023, Colorado adopted regulations requiring life insurers to adopt a governance and risk management framework for the use of artificial intelligence, machine learning and other technologies that utilize “external consumer data.” It is expected that Colorado will also adopt governance and testing regulations for other lines of insurance, in accordance with the requirements of its 2021 law.
We cannot predict whether states will adopt the AI Bulletin, or what, if any, changes to laws or regulations may be enacted with regard to “big data” or artificial intelligence technologies.
Risk-Based Capital Requirements. The NAIC utilizes a Risk-Based Capital (“RBC”) formula that is designed to measure the adequacy of an insurer's statutory surplus in relation to the risks inherent in its business. The RBC formula develops a risk adjusted target level of adjusted statutory capital by applying certain factors to various asset, premium and reserve items. The NAIC RBC Model Law provides for four incremental levels of regulatory attention for insurers whose surplus is below the calculated RBC target. These levels of attention range in severity from requiring the insurer to submit a plan for corrective action to actually placing the insurer under regulatory control. The RBC of each of our domestic insurance subsidiaries was above the calculated RBC target level as of December 31, 2022.2023. 
Insurance Regulatory Information System. The NAIC also has developed a set of 13 financial ratios for property and casualty insurers referred to as the Insurance Regulatory Information System (“IRIS”). On the basis of statutory financial statements filed with state insurance regulators, the NAIC annually calculates these IRIS ratios to assist state insurance regulators in monitoring the financial condition of insurance companies. The NAIC has established an acceptable range for each of the IRIS financial ratios.
Guaranty Funds. Our U.S. insurance subsidiaries are also subject to assessment by state guaranty funds in states where we transact admitted business when an insurer in a particular jurisdiction has been judicially declared insolvent and the insolvent company's available funds are insufficient to pay policyholders and claimants the amounts to which they are entitled. The protection afforded under a state's guaranty fund to policyholders of the insolvent insurer varies from state to state. Generally, all licensed property casualty insurers are considered to be members of the fund, and assessments are based upon their pro rata share of direct written premiums in that state. The NAIC Post-Assessment Property and Liability Insurance Guaranty Association Model Act, a version of which has been adopted by all states, limits assessments to 2% of an insurer’s subject premiums and permits recoupment of assessments through rate setting. Likewise, several states (or underwriting
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organizations of which our insurance subsidiaries are required to be members) have limited assessment authority with regard to deficits in certain lines of business.
Additionally, state insurance laws and regulations require us to participate in mandatory property-liability “shared market,” “pooling” or similar arrangements that provide certain types of insurance coverage to individuals or others who otherwise are unable to purchase coverage voluntarily provided by private insurers. Shared market mechanisms include assigned risk plans and fair access to insurance requirement or “FAIR” plans. In addition, some states require insurers to
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participate in reinsurance pools for claims that exceed specified amounts. Our participation in these mandatory shared market or pooling mechanisms generally is related to the amount of our direct writings for the type of coverage written by the specific mechanism in the applicable state. 
Dividends. We receive funds from our insurance company subsidiaries in the form of dividends and management fees for certain management services. Annual dividends in excess of maximum amounts prescribed by state statutes may not be paid without the approval of the insurance commissioner of the state in which an insurance subsidiary is domiciled. See “Management's Discussion and Analysis of Financial Condition and Results of Operations-Liquidity and Capital Resources.” 
Trade Practices. State insurance laws and regulations include numerous provisions governing trade practices and the marketplace activities of insurers, including provisions governing marketing and sales practices, policyholder services, claims management and complaint handling. State regulatory authorities generally enforce these provisions through periodic market conduct examinations.
Investment Regulation. Investments by our domestic insurance companies must comply with applicable laws and regulations which prescribe the kind, quality and concentration of investments. In general, these laws and regulations permit investments in federal, state and municipal obligations, corporate bonds, preferred and common equity securities, mortgage loans, real estate and certain other investments, subject to specified limits and certain other qualifications. Investments that do not comply with these limits and qualifications are deducted in our insurance subsidiaries' calculation of their statutory capital and surplus.
Terrorism Risk Insurance. The Terrorism Risk Insurance Act of 2002 established a Federal program that provides for a system of shared public and private compensation for insured losses resulting from acts of terrorism. Pursuant to the Terrorism Risk Insurance Program Reauthorization Act of 2019 (“TRIPRA”), the program was extended until December 31, 2027.
TRIPRA provides a federal backstop to all U.S. based property and casualty insurers for insurance related losses resulting from any act of terrorism on U.S. soil or against certain U.S. air carriers, vessels or foreign missions. TRIPRA is applicable to almost all commercial lines of property and casualty insurance but excludes commercial auto, burglary and theft, surety, professional liability and farm owners' multi-peril insurance. Insurers with direct commercial property and casualty insurance exposure in the United States are required to participate in the program and make available coverage for certified acts of terrorism. TRIPRA's definition of certified acts includes domestic terrorism. Federal participation will be triggered under TRIPRA when the Secretary of Treasury certifies an act of terrorism.
Under the program, the federal government will pay 80% of an insurer's covered losses in excess of the insurer's applicable deductible. The insurer's deductible is calculated as 20% of earned premium for the prior year for covered lines of commercial property and casualty insurance. Based on our 20222023 earned premiums, our aggregate deductible under TRIPRA during 20232024 will be approximately $1,310$1,464 million. The federal program will not pay losses for certified acts unless such losses exceed $200 million industry-wide for any calendar year after 2020.year. TRIPRA limits the federal government's share of losses at $100 billion for a program year. In addition, an insurer that has satisfied its deductible is not liable for the payment of losses in excess of the $100 billion cap.
Excess and Surplus Lines. The regulation of our U.S. subsidiaries' excess and surplus lines insurance business differs significantly from the regulation of our admitted business. Our surplus lines subsidiaries are subject to the surplus lines regulation and reporting requirements of the jurisdictions in which they are eligible to write surplus lines insurance. Although surplus lines business is generally less regulated than admitted business, principally with respect to rates and policy forms, strict regulations apply to surplus lines placements in the laws of every state and the regulation of surplus lines insurance may undergo changes in the future. Federal or state measures may be introduced to increase the oversight of surplus lines insurance in the future.
Climate Change and Financial Risks. The NAIC and state insurance regulators are evaluatingcontinue to evaluate issues related to the topicmanagement of climate risk. The NAIC’s goal isIn 2022, the NAIC adopted a new standard for insurance companies to addressreport their climate-related risks through three areasas part of insurance regulation: financial risk analysis; insurance market availabilityits annual Climate Risk Disclosure Survey, which applies to insurers that meet the reporting threshold of $100 million in U.S. direct premium and affordability; and consumer education and outreach. In New York,are licensed in one of the NYDFS issued aparticipating jurisdictions. The NYDFS’s 2020 circular letter, in September 2020 thatwhich applies to both New York domestic and foreign authorized insurers, such as our insurance subsidiaries licensed in New York. The circular letterYork, states that the NYDFS expects theseregulated insurers are expected to integrate
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financial risks related to climate change into their governance frameworks, risk management processes, business strategies and scenario analysis, and develop their approach to climate-related financial disclosure. For example, an insurer should designate a board member or board committee, as well as a senior management function, to oversee the management of financial risks associated with climate change. The NYDFS also adopted an amendment to the regulation governing enterprise risk management, which applies to our insurance subsidiaries licensed in New York, that requires an insurance group's enterprise risk management function to address certain additional risks, including climate change risk.

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In addition, the Federal Insurance Office (the “FIO”) is authorized to monitor the U.S. insurance industry under the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (the “Dodd-Frank Act”), as discussed below under “Federal Regulation.” ThePursuant to this statutory authority, the FIO is assessing how the insurance sector may help mitigate climate-relatedclimate risks and help achieve national climate-related goals.

 In June 2023, the FIO released a report urging insurance regulators to adopt climate-related risk-monitoring guidance in order to enhance their regulation and supervision of insurers.
Diversity and Corporate Governance.The NAIC and state insurance regulators are evaluatingalso continue to evaluate issues related to diversity within the insurance industry, such as the diversity of an insurer’s board of directors and management. The NAIC is also examining practices in the insurance industry in order to determine how barriers are created that disadvantage or discriminate against people of color or historically underrepresented groups. OnIn March 16, 2021, the NYDFS issued a circular letter stating that it expects the insurers it regulates, such as our insurance subsidiaries licensed in New York, to make diversity of their leadership a business priority and a key element of their corporate governance.governance, and it includes diversity-related questions in its examination process. In addition, the NAIC is examining practices in the insurance industry in order to determine how barriers are created that disadvantage or discriminate against people of color or historically underrepresented groups. NAIC goals include improving access to different types of insurance products in minority communities, addressing issues related to affordability, and providing guidance to regulators on ways to improve insurance access and the understanding of insurance in underserved communities. See “Human Capital Resources” below.
Federal Regulation. The federal government and its regulatory agencies generally do not directly regulate the business of insurance, although federal initiatives could have an impact on our business in a variety of ways. The Dodd-Frank Act effected sweeping changes to financial services regulation in the United States, and created two new federal government bodies, the FIO and the Financial Stability Oversight Council (the “FSOC”). The FIO does not have general supervisory or regulatory authority over the business of insurance, although it has preemption authority over state insurance laws that conflict with certain international agreements, as discussed below. The FIO also has authority to represent the United States in international insurance matters and is authorized to monitor the U.S. insurance industry and identify potential regulatory gaps that could contribute to systemic risk. The Economic Growth, Regulatory Relief and Consumer Protection Act of 2018 addresses the roles played by federal regulators at international insurance standard-setting forums, and it directs the Director of the FIO and the Board of Governors of the Federal Reserve to support increased transparency at international standard-setting regulatory forums (e.g., the IAIS). These federal regulations also instruct the FIO and the Federal Reserve to achieve consensus positions with the states through the NAIC prior to taking a position on any insurance proposal by a global insurance regulatory forum.
The Dodd-Frank Act authorizes the Secretary of the Treasury and U.S. Trade Representative to enter into international agreements of mutual recognition regarding the prudential regulation of insurance or reinsurance. The U.S. and the European Union ("EU") signed such a covered agreement (the "EU Covered Agreement") in September 2017. The EU Covered Agreement2017, which addresses three areas of prudential supervision: reinsurance, group supervision and the exchange of information between the U.S. and EU. Under the EU Covered Agreement, reinsurance collateral requirements no longer apply to qualifying EU reinsurers that sell reinsurance to the U.S. market, and U.S. reinsurers operating in the EU market are no longer subject to “local presence” requirements. The EU Covered Agreement establishes group supervision practices that apply only to U.S. and EU insurance groups operating in both territories. For instance, the EU Covered Agreement states that, provided the U.S. has adopted group supervision including worldwide group governance, solvency, capital and reporting, U.S.-headquartered insurance groups with operations in the EU will be supervised at the worldwide level only by U.S. insurance regulators, thereby precluding EU insurance supervisors from exercising solvency and capital requirements over the worldwide operations of those insurers.
In December 2018, the U.S. Department of the Treasury and the Office of the U.S. Trade Representative entered into a covered agreement with the U.K. (the “U.K. Covered Agreement,” and together with the EU Covered Agreement, the “Covered Agreements”) in anticipation of the U.K.’s exit from the EU. The U.K. Covered Agreement largely reflects the provisions of the EU Covered Agreement and incorporates the same timeframes within it.
Under the Dodd-Frank Act, the FIO has preemption authority over state insurance laws that conflict with the Covered Agreements as of September 1, 2022, such as state credit for reinsurance laws that result in non-U.S. reinsurers subject to the Covered Agreements being treated less favorably than U.S. reinsurers. The NAIC previously adopted amendments to its Credit for Reinsurance Model Law to satisfy the substantive and timing requirements of the Covered Agreements, which amendments have been enacted by all states. On September 30, 2022,2023, the FIO reported that it did not recommend taking any preemption action as a result of inconsistency between the Covered Agreements and state credit for reinsurance laws, although it is still monitoring state measures implementing the NAIC’s revisions to the Credit for Reinsurance Model Law. The FIO plansUnder the Covered Agreements, reinsurance collateral requirements no longer apply to publish an update to its preemption report during 2023.qualifying EU and U.K. reinsurers. The amended Credit for Reinsurance Model Law also extends the zero reinsurance collateral provisions in the Covered Agreements to qualified reinsurers domiciled in U.S. jurisdictions that are accredited by the NAIC and to non-U.S. jurisdictions that have not entered into a covered agreement with the U.S. but which the NAIC has identified as “reciprocal jurisdictions” pursuant to the NAIC Qualified Jurisdiction Process.
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We cannot currently predict the impact of these changes to the law or whether any other covered agreements will be successfully adopted, and cannot currently estimate the impact of these changes to the law and any such adopted covered agreements on our business, financial condition or operating results.
The FIO also can recommend thatDodd-Frank Act authorizes the FSOC to designate an insurer as an entity posing risks to the United States’ financial stability in the event of the insurer’s material financial distress or failure, i.e., a “systemically important financial institution” or a “non-bank SIFI.” AnSIFI” if the insurer’s material financial distress could pose a systemic risk to the financial system or the nature or scale of its activities could pose a threat to U.S. financial stability. The FIO can recommend that an insurer sobe designated byas a non-bank SIFI, which would subject the FSOC will be subjectcompany to Federal Reserve supervision and
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heightened prudential standards. There are currently no such non-bank SIFIs designated by the FSOC. TheIn November 2023, the FSOC changed itsadopted final guidance that establishes a new process for designating certain financial companies as non-bank SIFIs, effectiveSIFIs. The revised process is based on the consideration of risk factors set forth in January 2020, by adoptinga new analytic framework, which describes how the FSOC intends to monitor a broad range of institutions and activities and respond to potential risks to U.S. financial stability. The financial vulnerabilities that most often contribute to this type of risk include leverage, liquidity risk and maturity mismatch, inadequate risk management, concentration and destabilizing activities. Under the new guidance, the FSOC is no longer required to conduct a cost-benefit analysis and an activities-based approachassessment of the likelihood of a non-bank financial company’s material financial distress before considering the designation of the company. The revised process could have the effect of simplifying and moving away from the entities-based approach.shortening FSOC’s procedures for designating certain financial companies as non-bank SIFIs.
Based upon our current business model and balance sheet, we do not believe that we will be designated by the FSOC as such an institution. Although the potential impact of any future amendments to the Dodd-Frank Act on the U.S. insurance industry is not clear, our business could be affected by changes to the U.S. system of insurance regulation or our designation or the designation of insurers or reinsurers with which we do business as systemically important non-bank SIFIs.
Legislative and Regulatory Activity Related to the COVID-19 Pandemic or Other Potential Pandemics.In response to the outbreak of the COVID-19 pandemic in 2020, legislators in several states and in the United States Congress introduced proposals that would have mandated insurance coverage for certain pandemic-related losses, including business interruption losses, or that would have established a federal insurance program for addressing pandemic risk. None of these proposals were enacted. However, there remains some risk that in the event of another pandemic event, whether related to COVID-19 or another contagious disease, Congress could take similar actions. See “Risk Factors — Risks Related to Our Industry — The COVID-19 pandemic materially and adversely affected our results of operations, and, whether as a result of COVID-19's long-term effects, or new or emerging variants, or other potential pandemics, may further materially and adversely affect our results of operations, financial companies.position and liquidity in the future."
International Regulation
Our insurance subsidiaries based in the United Kingdom are regulated by the Prudential Regulation Authority (“PRA”) and/or the Financial Conduct Authority (“FCA”). The PRA’s primary objectives with regard to insurers are to promote the safety and soundness of insurers and to contribute to the securing of an appropriate degree of protection for current and future policyholders. The FCA has three operational objectives: (i) to secure an appropriate degree of protection for consumers, (ii) to protect and enhance the integrity of the United Kingdom’s financial system, and (iii) to promote effective competition in the interests of consumers in the financial services markets. The PRA and FCA employ a variety of regulatory tools to achieve their objectives, including periodic auditing and reporting requirements, risk assessment reviews, minimum solvency margins and individual capital assessment requirements, dividend restrictions, in certain cases, approval requirements governing the appointment of key officers, approval requirements governing controlling ownership interests and various other requirements.
Our Lloyd’s managing agency is also regulated by Lloyd’s, and the Lloyd’s syndicate business is subject to Lloyd’s supervision. Through Lloyd’s, we are licensed to write business in various countries throughout the world by virtue of Lloyd’s international licenses. In each such country, we are subject to the laws and insurance regulation of that country. Our insurance subsidiary based in Liechtenstein is regulated by the Financial Market Authority of Liechtenstein ("FMA"), which has regulatory tools analogous to those of the U.K. regulators noted above.
Additionally, U.K. and Liechtenstein laws and regulations also impact us as “controllers” of our European-regulated subsidiaries, whereby we are required to notify the appropriate authorities about significant events relating to such regulated subsidiaries’ controllers (i.e. persons or entities which have certain levels of direct or indirect voting power or economic interests in the regulated entities) as well as changes of control, and to submit annual reports regarding their controllers. The PRA/FCA’s Senior Managers and Certification Regime and analogous regulation in Liechtenstein further provide regulatory frameworks for standards of fitness and propriety, conduct and accountability for individuals in positions of responsibility at insurers. In addition, certain employees are individually registered at Lloyd’s.
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Our insurance business throughout the EU and EEA is subject to “Solvency II,” an insurance regulatory regime governing, among other things, capital adequacy and risk management. Following the U.K.’s withdrawal from the EU, or Brexit, our Lloyd’s managing agency (and the U.K. branch of our Liechtenstein subsidiary) are now subject to a separate U.K. prudential regime, which is broadly identical to Solvency II but will diverge from January 1, 2021. However, the two regimes are likely to divergeSolvency II in the near future. The U.K. has undertaken a reviewrecently adopted legislative reforms that amended various parts of Solvency II and of the regulatory regime applicable to U.K. authorized insurers and reinsurers.
Following this review, on November 17, 2022, the U.K.’s HM Treasury published a finalized package of proposed reforms to the U.K.’s prudential regime, which covers a range of areas including the risk margin, matching adjustment requirements and regulatory reporting obligations. TheseThe legislative reforms relating to the risk margin took effect from December 31, 2023, and other areas of reform will be reflected in new U.K. legislation and regulation.come into force throughout 2024.
Similarly, the European Commission hasEU’s legislative bodies have undertaken its owna review of Solvency II and, onII. In September 22, 2021, the European Commission published a package of proposed legislative reforms for amending the existing regulatory framework. The European Council published its agreed positionlegislative bodies reached a provisional agreement on the European Commission’s proposed reformsrevised text of Solvency II in June 2022,December 2023. A finalized set of rules will now be prepared, which it is currently negotiating with the European Parliament, although the full extent of the changesEU member states will only be known once the package of legislative reforms is finalized.implement into their domestic legislation.
Solvency II provides for the supervision of group solvency. Under Solvency II, it is possible that the U.S. parent of a European Union subsidiary could be subject to certain Solvency II requirements if the U.S. company is not already subject to regulations deemed “equivalent” to Solvency II. Currently, the U.S. system of insurance regulation relating to group supervision is not deemed “equivalent” to Solvency II by European Union authorities. The PRA will also perform separate, but comparable, supervision of group solvency under the U.K.’s own domestic prudential regime where a U.S. holding company is a parent of a subsidiary U.K. insurer or reinsurer.
The Liechtenstein financial services regulator, the FMA, is the group supervisor for our European-regulated subsidiaries. However, the Covered Agreements prohibit any EU supervisor or the PRA (as applicable) from exercising group-wide supervision at any level above the highest company organized in the country of that supervisor.
We must also comply with the EU General Data Protection Regulation (EU) 2016/879) (“GDPR”), which took effect
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in May 2018.2018, including EEA member state legislation implementing the GDPR. The regulation’s goal is to impose increased individual rights and protections for all personal data located in or originating from the EU. The Data Protection Act 2018 and the U.K. General Data Protection Regulation, which is the retained EU law version of the GDPR by virtue of the European Union (Withdrawal) Act 2018 and as amended by the Data Protection, Privacy and Electronic Communications (Amendments etc.) (EU Exit) Regulations 2019 (together, “U.K. GDPR”), regulate data protection for all individuals within the U.K. Both the GDPR and the U.K. GDPR are extraterritorial in that they apply to all businesses in the EU and the U.K. respectively and any business outside the EU and the U.K. that processoffers services, or monitors the behavior of individuals, in the EU and/or U.K., and that processes the personal data of individuals in the EU and/or the U.K. Moreover, there are significant fines associated with non-compliance. In particular, we need to monitor our compliance with all relevant member states’ laws and regulations, including where permitted derogations from the GDPR and the U.K. GDPR are introduced. The introduction of the GDPR and the U.K. GDPR, and any resultant changes in EU member states’ or U.K. national laws and regulations, has increased our compliance obligations and has necessitated the review and implementation of policies and processes relating to our collection and use of data, and has required us to change our business practices regarding these matters.
In addition, we may become subject to or affected by regulatory policies adopted by the IAIS, an international standard setter consisting of supervisors and regulators from more than 200 jurisdictions. The IAIS has been working on several initiatives to consider changes to insurer solvency standards and group supervision of companies in a holding company system in response to the increasing globalization of the insurance sector. In November 2019, the IAIS formally adopted a global framework for the supervision of internationally active insurance groups (“IAIGs”),IAIGs, which is referred to as the Common Framework for the Supervision of Internationally Active Insurance Groups, or “ComFrame.” ComFrame is intended to provide a framework of basic standards for IAIGs and a process for supervisors to cooperate in the supervision of IAIGs. Also in November 2019, the IAIS adopted a risk-based group-wide global insurance capital standard (“ICS”) that will apply to IAIGs and ultimately form a part of ComFrame. The ICS commenced a five-year monitoring period in January 2020 which is being used for confidential reporting and discussion in supervisory colleges to provide feedback to the IAIS on the ICS’s design and performance, but will not trigger any supervisory action. Following this monitoring period, the ICS is expected to be implemented in 2025 as a group-wide prescribed capital requirement for IAIGs and integrated into the rest of ComFrame. The IAIS is also conducting a comparability assessment to determine whether an aggregation method approach to a group capital standard, which forms part of the NAIC’s group capital calculation, produces comparable outcomes to the ICS. As noted above under “U.S. Regulation,” it is unclear how the development of the ICS will interact with existing capital requirements for insurance companies in the United States and the NAIC’s development of the group capital calculation. We have received notice from Delaware, our lead state insurance regulator, that we may be considered an IAIG. In the event that we are deemed to be an IAIG, we would be subject to international oversight coordinated by the Delaware Department of Insurance.
Our international operations are also subject to varying degrees of regulation in Mexico, Australia and Canada and in certain other countries in Europe, South America, and Southeast Asia. Generally, our subsidiaries must satisfy local regulatory
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requirements. While each country imposes licensing, solvency, auditing and financial reporting requirements, the type and extent of the requirements differ substantially. Key areas where country regulations may differ include: (i) the type of financial reports to be filed; (ii) a requirement to use local intermediaries; (iii) the amount of reinsurance permissible; (iv) the scope of any regulation of policy forms and rates; and (v) the type and frequency of regulatory examinations.
Competition 
The property casualty insurance and reinsurance businesses are highly competitive, with many insurance companies of various sizes, as well as other entities offering risk alternatives such as self-insured retentions or captive programs, transacting business in the United States and internationally. We compete directly with a large number of these companies. Competition in our industry is largely measured by the ability to provide insurance and services at a price and on terms that are reasonable and acceptable to the customer. Our strategy in this highly fragmented industry is to seek specialized areas or geographic regions where our businesses can gain a competitive advantage by responding quickly to changing market conditions. Our businesses establish their own pricing practices based upon a Company-wide philosophy to price products with the intent of making an underwriting profit.
Competition for insurance business within the United States comes from other specialty insurers, regional carriers, large national multi-line companies and reinsurers. Our specialty businesses compete with excess and surplus insurers as well as standard carriers. Our regional businesses compete with mutual and other regional stock companies as well as national carriers. Additionally, direct writers of property casualty insurance compete with our regional businesses by writing insurance through their salaried employees, generally at a lower acquisition cost than through independent agents such as those used by the Company. We compete internationally with native insurance operations both large and small, which in some cases are related to government entities, as well as with branches or local subsidiaries of multinational companies.
Competition for reinsurance business, which is especially strong, comes from domestic and foreign reinsurers, which produce their business either on a direct basis or through the broker market. These competitors include Swiss Re, Munich Re, Berkshire Hathaway, Partner Re and others.
In recent years, various institutional investors have increasingly sought to participate in the property and casualty insurance and reinsurance industries. Well-capitalized new entrants to the property and casualty insurance and reinsurance industries, or existing competitors that receive substantial infusions of capital, provide increasing competition, which may
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adversely impact our business and profitability. Further, an expanded supply of reinsurance capital may lower costs for insurers that rely on reinsurance and, as a consequence, those insurers may be able to price their products more competitively.
Human Capital Resources 
As of January 15, 2023,2024, we employed 8,1868,329 individuals. Of this number, our subsidiaries employed 8,0498,194 individuals and the remaining individuals were employed at the parent company.
We believe that our people are our greatest asset and that our corporate culture is the most important intangible driver of long-term value creation for our Company and the highest priority for pursuing long-term risk-adjusted returns and growth in stockholder value.
Human Capital Management: The Company fosters a performance culture. We are focused on creating a respectful, rewarding, diverse, and inclusive work environment that allows our employees to build meaningful and productive careers. The success of these human capital management objectives is essential to our strategy, as it is our people who drive our success. We invest in their growth as individuals and professionals through training and engagement, as well as in their well-being through robust health and wellness programs and a commitment to diversity.
The Company provides developmental opportunities for our employees through formal and informal programs that focus on enabling employees to build skills and thought leadership in specific facets of our business. Our leadership programs cultivate the talent of our high-potential, strong-performing employees as we strive to deepen, enhance and diversify the Company’s leadership team.
We strive to align employee incentives with the risk and performance frameworks of the Company. The Company’s “pay for performance” philosophy connects individual, business and Company results to employee compensation, providing employees with opportunities to share in the Company’s overall growth and success. The Company offers employees a comprehensive benefits package, including health and wellness, financial, educational and life management benefits. In addition, we support employees in making an impact in their local communities and globally through environmental and social efforts that are meaningful to them.
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Our Board of Directors engages with our senior leadership team, including our senior vice president - human resources, on a periodic basis across a range of human capital management issues, including succession planning and development, compensation, benefits, talent recruiting and retention, engagement, diversity and inclusion, and employee feedback.
Culture: The Board of Directors has recognized Accountability, People Oriented Strategy, Responsible Financial Practices, Risk-Adjusted Returns and Transparency as the elements of corporate culture necessary for the Company to achieve success. Our culture unifies our employees across our decentralized business model, positions us to serve our diverse clients globally and propels the Company’s continuous evolution.
We are committed to fostering a unifying culture and encouraging innovation across our enterprise. Our culture encompasses the beliefs that (i) specialized knowledge and having a customer-centric focus are competitive advantages and (ii) an environment that promotes integrity, embraces the commitment to “always do right,” fosters entrepreneurship and innovation, and values making thoughtful decisions for the long-term benefit of our enterprise. While there is no one “Berkley” way, each of our businesses has its own culture that embodies a shared set of values that define our enterprise. Our structure, with more than 5560 distinct businesses, facilitates the prompt identification of and appropriate action with respect to addressing individual business or cultural issues arising within a business, without affecting the larger enterprise. Furthermore, our businesses are overseen by senior corporate business managers and senior corporate functional managers, including actuarial, claims, underwriting, compliance and finance, providing a governance oversight structure that makes it easier to identify such issues. Because our Board of Directors diligently exercises its risk management oversight through, among other activities, regular interactions with employees beyond corporate senior management, our directors have visibility into and receive timely feedback on cultural issues that may affect our business.
As significant owners of our Company who are required to hold their shares until separation from service, each of our directors and senior executives have a vested interest in cultivating talent and perpetuating a culture that facilitates the execution of our long-term objectives.
Other Information about the Company's Business
We maintain an interest in evaluating the startup of possible new ventures and the acquisition and startup of complementary businesses and continue to evaluate possible acquisitions and new ventures on an ongoing basis. In addition, our businesses develop new coverages or enter lines of business to meet the needs of insureds.
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Seasonal weather variations and other events affect the severity and frequency of losses sustained by the insurance and reinsurance businesses. Although the effect on our business of catastrophes such as tornadoes, hurricanes, hailstorms, wildfires, earthquakes and terrorist acts may be mitigated by reinsurance, they nevertheless can have a significant impact on the results of any one or more reporting periods. 
We have no customer that accounts for 10 percent or more of our consolidated revenues.
Compliance by W. R. Berkley and its subsidiaries with federal, state and local provisions that have been enacted or adopted regulating the discharge of materials into the environment, or otherwise relating to protection of the environment, has not had a material effect upon our capital expenditures, earnings or competitive position.
The Company's internet address is www.berkley.com. The information on our website is not incorporated by reference in this annual report on Form 10-K. The Company's annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act and other reports filed by us or with respect to our securities by others are accessible free of charge through this website as soon as reasonably practicable after they have been electronically filed with or furnished to the SEC.


ITEM 1A. RISK FACTORS
Our businesses face significant risks. If any of the events or circumstances described as risks below occur, our businesses, results of operations and/or financial condition could be materially and adversely affected. In addition to those described below, our businesses may also be adversely affected by risks and uncertainties not currently known to us or that we currently consider immaterial.
Risks Relating to Our Industry 
Our results may fluctuate as a result of many factors, including cyclical changes in the insurance and reinsurance industry.
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The results of companies in the property casualty insurance industry historically have been subject to significant fluctuations and uncertainties in demand and pricing, causing cyclical changes in the insurance and reinsurance industry. The demand for insurance is influenced primarily by general economic conditions, while the supply of insurance is often directly related to available capacity or the perceived profitability of the business. WeAt times, we have faced significant competition in our business as a result of existing insurers seeking to gain or maintain market share as well as new entrants and capital providers. Recently, premium rates have increased for most lines of business, while they have decreased in others, most notably workers' compensation.compensation and certain professional liability lines of business. The adequacy of premium rates is affected mainly by the severity and frequency of claims, which are influenced by many factors, including natural disasters, regulatory measures and court decisions that define and expand the extent of coverage, and the effects of economic and social inflation on the amount of claims payments due for injuries or losses. In addition, investment rates of return impact rate adequacy. These factors can have a significant impact on ultimate profitability because a property casualty insurance policy is priced before its costs are known as premiums usually are determined long before claims are reported. These factors could produce results that would have a negative impact on our results of operations and financial condition.
We face significant competitive pressures in our businesses, which can pressure premium rates in certain areas and could harm our ability to maintain or increase our profitability and premium volume in some parts of our business. 
We compete with a large number of other companies in our selected lines of business. We compete, and will continue to compete, with major U.S. and non-U.S. insurers and reinsurers, other regional companies, as well as mutual companies, specialty insurance companies, underwriting agencies, diversified financial services companies and insurtech companies. Competitiveness in our businesses is based on many factors, including premium charges, ratings assigned by independent rating agencies, commissions paid to producers, the perceived financial strength of the company, other terms and conditions offered, services provided, ease of doing business, speed of claims payment and reputation and experience in the lines to be written. Periods of insurance industry consolidation may further increase competition in some parts of our business and may cause our insurance subsidiaries to incur greater customer retention and acquisition expenses, affecting the profitability of existing and new business.
Some of our competitors, particularly in the reinsurance business, have greater financial and/or marketing resources than we do. These competitors within the reinsurance market include Swiss Re, Munich Re, Berkshire Hathaway and Partner Re. We expect that perceived financial strength, in particular, will become more important as customers seek high quality reinsurers.
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Recently, insurance prices have generally increased for most lines of business, excluding workers' compensation.compensation and certain professional liability lines of business. However, loss costs have also increased and the duration and magnitude of the improving pricing environment remains uncertain. Despite risinghigher interest rates, current price levels for certain lines of business may remain below the prices required for us to achieve our long-term return objectives. We expect to continue to face strong competition in our business.
In recent years, various types of investors have increasingly sought to participate in the property and casualty insurance and reinsurance industries. Well-capitalized new entrants to the property and casualty insurance and reinsurance industries, or existing competitors that receive substantial infusions of capital or access to third-party capital, provide increasing competition, which may adversely impact our business and profitability. Further, an expanded supply of capital may lower costs for insurers and, as a consequence, those insurers may be able to price their products more competitively. In addition, technology companies or other third parties have created, and may in the future create, technology-enabled business models, processes, platforms or alternate distribution channels that may adversely impact our competitive position in some parts of our business.
This intense competition could cause the supply and/or demand for insurance or reinsurance to change, which affect our ability to price our products at attractive rates and retain existing business or write new products at adequate rates or on terms and conditions acceptable to us. If we are unable to retain existing business or write new business at adequate rates or on terms and conditions acceptable to us, our results of operations could be materially and adversely affected.
Our actual claims losses may exceed our reserves for claims, which may require us to establish additional reserves. 
Our gross reserves for losses and loss expenses were approximately $17.0$18.7 billion as of December 31, 2022.2023. Our loss reserves reflect our best estimates of the cost of settling claims and related expenses with respect to insured events that have occurred. 
Reserves do not represent an exact calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claims administration will cost for claims that have occurred, whether known or unknown. The major assumptions about anticipated loss emergence patterns are subject to unanticipated fluctuation. These estimates, which generally involve actuarial projections, are based on management's assessment of facts and circumstances then known, as
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well as estimates of future trends in claims severity and frequency, inflation, judicial theories of liability, reinsurance coverage, legislative changes and other factors, including the actions of third parties, which are beyond our control. 
The inherent uncertainties of estimating reserves are greater for certain types of liabilities, where long periods of time elapse before a definitive determination of liability is made and settlement is reached. In periods with increased economic volatility, it becomes more difficult to accurately estimate claim costs. It is especially difficult to estimate the impact of inflation on loss reserves given the current economic environment and related government actions. Both inflation overall and medical cost inflation, which has historically been greater than inflation overall, can have an adverse impact. In addition, although the Company has estimated the potential COVID-19 impact to its contingency and event cancellation, workers’ compensation, and other lines of business under a number of possible scenarios, there remains uncertainty around COVID-19's ultimate impact on the Company and its related reserves.
Reserve estimates are continually refined in an ongoing process as experience develops and further claims are reported and settled. Adjustments to reserves are reflected in the results of the periods in which such estimates are changed. Because setting reserves is inherently uncertain, we cannot assure that our current reserves will prove adequate in light of subsequent events. Should we need to increase our reserves, our pre-tax income for the reporting period would decrease by a corresponding amount. 
We discount our reserves for excess and assumed workers' compensation business because of the long period of time over which losses are paid. Discounting is intended to appropriately match losses and loss expenses to income earned on investment securities supporting liabilities. The expected loss and loss expense payout pattern subject to discounting is derived from our loss payout experience. Changes in the loss and loss expense payout pattern are recorded in the period they are determined. If the actual loss payout pattern is shorter than anticipated, the discount will be reduced and pre-tax income will decrease by a corresponding amount.
The effects of emerging claim and coverage issues on our business are uncertain.    
As industry practices and economic, legal, judicial, social, technological and other environmental conditions change, unexpected and unintended issues related to claim and coverage may emerge. These issues may adversely affect our business by either extending coverage beyond our underwriting intent or by increasing the number or size of claims. Examples of emerging claims and coverage issues include, but are not limited to:
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•judicial expansion of policy coverage and a greater propensity to grant claimants more favorable amounts and the impact of new theories of liability;
•plaintiffs targeting property and casualty insurers, including us, in purported class action litigation relating to claims-handling and other practices;
•social inflation trends, including higher and more frequent claims, more favorable judgments and legislated increases;
•medical developments that link health issues to particular causes, resulting in liability claims;
•claims relating to unanticipated consequences of current or new technologies, including cyber security related risks;    
•claims relating to potentially changing climate conditions; and
•increased claims due to third party funding of litigation.
In some instances, these emerging issues may not become apparent for some time after we have issued the affected insurance policies. As a result, the full extent of liability under our insurance policies may not be known until many years after the policies are issued.
In addition, the potential passage of new legislation designed to expand the right to sue, to remove limitations on recovery, to extend the statutes of limitations or otherwise to repeal or weaken tort reforms could have an adverse impact on our business.
The effects of these and other unforeseen emerging claim and coverage issues are difficult to predict and could harm our business and materially and adversely affect our results of operations.
As a property casualty insurer, we face losses from natural and man-made catastrophes. 
Property casualty insurers are subject to claims arising out of catastrophes that may have a significant effect on their results of operations, liquidity and financial condition. Catastrophe losses have had a significant impact on our results. For example, catastrophe losses net of reinsurance recoveries, including COVID-19 related losses, were $195 million in 2023, $212
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million in 2022, and $202 million in 2021, and $340 million in 2020.2021. Similarly, man-made catastrophes can also have a material impact on our financial results. Depending on market conditions and other factors, we may seek to increase our writing of property casualty insurance, and, accordingly, our exposure to catastrophic events would be increased.
Catastrophes can be caused by various events, including hurricanes, windstorms, earthquakes, tsunamis, hailstorms, explosions, severe winter weather and fires, pandemics, as well as terrorist and other man-made activities, including drilling, mining and other industrial accidents, the bankruptcy of a major company, war or other military actions, social unrest,
cyber events or terrorist activities. The incidence and severity of catastrophes are inherently unpredictable, and longer-term natural catastrophe trends may be changing due to climate change causing increased variability and unpredictability. 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. Some catastrophes are restricted to small geographic areas; however, hurricanes, earthquakes, tsunamis and other disasters may produce significant damage in large, heavily populated areas. Catastrophes can cause losses in a variety of our property and casualty lines, and most of our past catastrophe-related claims have resulted from severe storms. Seasonal weather variations or the impact of climate change may affect the severity and frequency of our losses. Insurance companies are not permitted to reserve for a catastrophe until it has occurred. It is therefore possible that a catastrophic event or multiple catastrophic events could produce significant losses and have a material adverse effect on our results of operations and financial condition.
The COVID-19 pandemic has previously materially and adversely affected our results of operations, and, whether as a result of COVID-19's long-term effects, or new or emerging variants, or other potential pandemics, may further materially and adversely affect our results of operations, financial position and liquidity in the future.
The ongoing COVID-19 pandemic, including the related impact on the U.S. and global economies, materially and adversely affected our results of operations. The pandemic and itspandemic's impact on our business may continue, and potentially even worsen, whether as a result of COVID-19's long-term effects, or new or emerging variants, or even other potential pandemics. We cannot predict the magnitude or duration of such impact, particularly given the uncertainties associated with COVID-19 including regarding the U.S. and global economies and the recovery from its devastating economic andor other effects.potential pandemics. The ultimate impact of COVID-19 or other potential pandemics on our results of operations, financial position and liquidity is not yet known, but includes the following:following:
Adverse Legislative and Regulatory Action. Legislative and regulatory initiatives in response to COVID-19 or other similar future pandemics may adversely affect us, particularly in our workers’ compensation and property coverages businesses. For
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example, our business may be subject to, certain initiatives, including, but not limited to: legislative and regulatory action that seeks to retroactively mandate coverage for losses that our insurance policies would not otherwise cover and which were not priced to cover; legislative and regulatory action providing for shifting presumptions with respect to the burdens of proof for “essential” workers on workers’ compensation coverages and varying definitions of “essential” workers; actions prohibiting us from cancelling insurance policies in accordance with our policy terms or non-renewing policies at their natural expiration; and/or orders to provide premium refunds, grant extended grace periods for premium payments, and provide extended time to pay past due premiums. Any such action would likely increase both our underwriting losses and our expenses and any legal challenges to any such action could take years to resolve.
Claim Losses Related to COVID-19 May Exceed Reserves. As of December 31, 2022,2023, we recorded approximately $341$384 million for COVID-19-related losses. Our reserves do not represent an exact calculation of liability, but represent an estimate of what management expects the ultimate settlement and claims administration will cost for claims that have occurred, whether known or unknown. Accordingly, given the uncertainties still associated with COVID-19 and its impact, our reserves and the underlying estimated level of claim losses and costs arising from COVID-19 may materially change.
Claim Losses and Adjustment Expenses May Increase. As the effects of COVID-19 or future pandemics on industry practices and economic, legal, judicial, social and other environmental conditions occur, unexpected and unintended issues related to claims and coverages may emerge. These issues may adversely affect our business by extending coverage beyond our underwriting intent (including in the area of property coverages where physical damage requirements and communicable disease exclusions are currently being challenged) or by increasing the number and/or size of claims, each of which could adversely impact our results.
Reinsurance. We purchase reinsurance in order to transfer part of the risk that we have assumed by writing insurance policies to reinsurance companies in exchange for part of the premium we receive in connection with assuming such risk. Although reinsurance makes the reinsurer contractually liable to us to the extent the risk is transferred to the reinsurer, it does not relieve us of our liability to our policyholders. There may be uncertainty surrounding the availability of reinsurance coverage for COVID-19-related losses related to COVID-19 or any future pandemics as our reinsurers may dispute the applicability of reinsurance to such losses (including the application of reinsurance reinstatements) and, as a result, our reinsurers may refuse to pay reinsurance recoverables related thereto or they may not pay them on a timely basis. On December 22, 2023, one of the
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Company’s subsidiaries filed a lawsuit against certain reinsurers to recover in excess of $90 million in respect of certain losses paid to its policyholders under certain event cancellation and related insurance policies. See, "Item 3. Legal Proceedings." In addition, we may be unable to renew our current reinsurance coverages or obtain appropriate new reinsurance covers with respect to certain exposures under our policies, including COVID-19-related exposures related to COVID-19 or any future pandemics, and therefore our net exposures could increase, or if we are unwilling to bear such increase in net exposure, we may reduce our level of underwriting commitments.
Premium Volumes May Be Negatively Impacted. The demand for insurance is significantly influenced by general economic conditions. Consequently, any reduced economic activity relating to COVID-19 or other potential pandemics is likely to decrease demand for our insurance products and services and negatively impact our premium volumes (and, in certain cases, may result in return of premiums due to a decrease in exposures). This may continue for an indefinite period, with the magnitude of the impact impossible to predict. In addition, as we continue to evaluate the effects of COVID-19 on the insurance coverages we currently offer, our appetite for providing certain coverages in various jurisdictions may change, which could further negatively impact our premium volumes. Any such reduction in our premiums would likely cause our expense ratio to rise.
Investments. Further disruptionsDisruptions in global financial markets due to the continuing impact of COVID-19 or future pandemics could cause us to incur additional unrealized and/or realized investment losses, including impairments in our fixed maturity portfolio and other investments. In addition, the economic uncertainty may result in a decline in interest rates, which may negatively impact our net investment income from future investment activity.
Operational Disruptions and Costs. Our operations could be disrupted if key members of our senior management or a significant percentage of our workforce or the workforce of our agents, brokers, suppliers or other third party service providers are unable to continue to work because of illness, government directives or otherwise. In addition, our agents, brokers, suppliers and other third party service providers, which we rely on for key aspects of our operations, are subject to similar risks and uncertainties, which may interfere with their ability to fulfill their respective commitments and responsibilities to us in a timely manner and in accordance with the agreed-upon terms. Any remote working policies we implement may result in disruptions to our business routines, heightened risk to cybersecurity attacks and data security incidents and a greater dependency on internet and telecommunication access and capabilities.
Changing climate conditions may alter the frequency and increase the severity of catastrophic events and thereby adversely affect our financial condition and results.    
Over the past severalIn recent years, changing weather patterns and climatic conditions, such as global warming, appear to have contributed to the unpredictability, frequency and severity of natural disasters and created additional uncertainty as to future
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trends and exposures. There is a growing scientific consensus that global warming and other climate change are altering the frequency, severity and peril characteristics of catastrophic weather events, such as hurricanes, windstorms, floods and other natural disasters. Such changes make it more difficult for us to predict and model catastrophic events, reducing our ability to accurately price our exposure to such events and mitigate our risks. Any increase in the frequency or severity of natural disasters may adversely affect our financial condition and results.
We, as a primary insurer, may have significant exposure for terrorist acts. 
To the extent an act of terrorism, whether a domestic or foreign act, is certified by the Secretary of Treasury, we may be covered under the Terrorism Risk Insurance Program Reauthorization Act of 2019 (“TRIPRA”), for up to 80% of our covered losses for certain property/casualty lines of insurance. However, any such coverage would be subject to a mandatory deductible based on 20% of earned premium for the prior year for the covered lines of commercial property and casualty insurance. Based on our 20222023 earned premiums, our aggregate deductible under TRIPRA during 20232024 is approximately $1,310$1,464 million. In addition, the coverage provided under TRIPRA does not apply to reinsurance that we write. To the extent that our reinsurers have excluded coverage for certain terrorist acts or have priced this coverage at rates that make purchasing such coverage economically infeasible, we may not have reinsurance protection and could be exposed to potential losses as a result of any acts of terrorism.  
We are exposed to, and may face adverse developments involving, mass tort claims.
We are exposed to, and may face adverse developments involving, mass tort claims such as those relating to exposure to potentially harmful products or substances. We face potential exposure to mass tort claims, including claims related to exposure to potentially harmful products or substances, such as lead paint, polyfluoroalkyl substances, talc and opioids. Establishing loss reserves for mass tort claims is subject to uncertainties because of many factors, including adverse changes to the tort environment (e.g., increased and more aggressive attorney involvement in insurance claims, increased litigation, expanded theories of liability, higher jury awards, lawsuit abuse and third-party litigation finance, among others); evolving judicial interpretations, including application of various theories of joint and several liabilities; disputes concerning medical causation with respect to certain diseases; geographical concentration of the lawsuits asserting the claims; and the potential for a large rise in the total number of claims without underlying epidemiological developments suggesting an increase in disease rates. Because of the uncertainties set forth above, additional liabilities may arise for amounts in excess of the current loss
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reserves. In addition, our estimate of loss reserves may change. These additional liabilities or increases in estimates, or a range of either, could vary significantly from period to period and could materially and adversely affect our results of operations and/or our financial position.
We are subject to extensive governmental regulation, which increases our costs and could restrict the conduct of our business. 
We are subject to extensive governmental regulation and supervision in both the United States and foreign jurisdictions. Most insurance regulations are designed to protect the interests of policyholders rather than stockholders and other investors. This system of regulation, generally administered in the United States by a department of insurance in each state in which we do business, relates to, among other things:
•standards of solvency, including risk-based capital measurements;
•restrictions on the nature, quality and concentration of investments;
•limitations on the amount of dividends, tax distributions, intercompany loans and other payments that can be made without prior regulatory approval;

•requirements pertaining to certain methods of accounting;

•evaluating enterprise risk to an insurer;
•privacy, data protection, and cybersecurity;
•rate and form regulation pertaining to certain of our insurance businesses; 
•potential assessments for the provision of funds necessary for the settlement of covered claims under certain policies provided by impaired, insolvent or failed insurance companies; and
•involvement in the payment or adjudication of catastrophe or other claims beyond the terms of the policies.
State insurance departments conduct periodic examinations of the affairs of insurance companies and require the filing of annual and other reports relating to the financial condition of insurance companies, holding company issues and other matters. Our Insurance business internationally is also generally subject to a similar regulatory scheme in each of the jurisdictions where we conduct operations outside the United States.
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Federal financial services modernization legislation and legislative and regulatory initiatives taken or which may be taken in response to conditions in the financial markets, global insurance supervision and other factors may lead to additional federal regulation of the insurance industry in the coming years.
The Dodd-Frank Act effected sweeping changes to financial services regulation in the United States. The Dodd-Frank Act established the Financial Stability Oversight Council (“FSOC”),FSOC, which is authorized to recommend that certain systemically significant non-bank financial companies, including insurance companies, be regulated by the Board of Governors of the Federal Reserve. The Dodd-Frank Act also established a Federal Insurance Office (“FIO”)FIO which is authorized to study, monitor and report to Congress on the U.S. insurance industry and the significance of global reinsurance to the U.S. insurance market. The FIO also can recommend that the FSOC designate an insurer as an entity posing risks to the United States financial stability in the event of the insurer's material financial distress or failure. Our business could be affected by changes, whether as a result of potential changes to the Dodd-Frank Act, to the U.S. system of insurance regulation or our designation or the designation of insurers or reinsurers with which we do business as systemically significant non-bank financial companies.
The topic of climate risk has come under increased scrutiny by the NAIC and insurance regulators. For instance, in New York, the NYDFS issued aNYDFS’s circular letter, in September 2020 thatwhich applies to both New York domestic and foreign authorized insurers, such as our insurance subsidiaries licensed in New York. The circular letterYork, states that the NYDFS expects theseregulated insurers are expected to integrate financial risks related to climate change into their governance frameworks, risk management processes, business strategies and scenario analysis, and develop their approach to climate-related financial disclosure. The NYDFS also amended the regulation governing enterprise risk management, which applies to our insurance subsidiaries licensed in New York, that requires an insurance group's enterprise risk management function to address certain additional risks, including climate change risk. In addition, the FIO is assessing how the insurance sector may help mitigate climate-relatedclimate- related risks and achieve national climate-related goals.goals, and it released a report in June 2023 urging insurance regulators to adopt climate-related risk monitoring guidance. These measures may subject us to increased oversight at the state and federal level.
State regulation is the primary form of regulation of insurance and reinsurance in the United States, although Congress has considered various proposals regarding federal regulation of insurance, in addition to the changes brought about by the
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Dodd-Frank Act, such as proposals for the creation of an optional federal charter for insurance companies. We may be subject to potentially increased federal oversight as a financial institution. In addition, the current U.S. administration and the volatile political environment may increase(including, in particular, the upcoming U.S. presidential election in November 2024) increases the chance of other federal legislative and regulatory changes that could affect us in ways we cannot predict.
With respect to international measures, Solvency II, the EU regime concerning the capital adequacy, risk management and regulatory reporting for insurers and reinsurers may affect our insurance businesses. Implementation of Solvency IIAs described in “International Regulation” above, the EU member states occurred on January 1, 2016, and as the Solvency II regime evolves over time, we may be required to utilize a significant amount of resources to ensure compliance. In particular, the European Commission has undertakenis performing a review of Solvency II and on September 22, 2021, published a package of proposed legislativevarious regulatory reforms for amending the existing regulatory framework. The European Council published its agreed position on the European Commission’s proposed reformsare expected to be introduced during 2024, which EU member states will implement in June 2022, and it is now discussing this proposed legislation with the European Parliament.their domestic regulation. In addition, despite the waiver of the Solvency II group capital requirements we received, Solvency II may have the effect of increasing the capital requirements of our EU domiciled insurers. Additionally, our capital requirements and compliance requirements may be adversely affected if the European Commission does not deem the insurance regulatory regimes of the jurisdictions outside the EU in which we have insurance or reinsurance companies domiciled to be “equivalent” to Solvency II.
Similar considerations apply to our U.K. subsidiaries, which are now subject to a separate U.K. prudential regime, which is broadly identical to Solvency II. However, the two regimes, and their respective requirements, are likely to diverge in the near futurediverging due to both the EU’s review of Solvency II described above and HM Treasury’s publication of a finalized package ofthe recently adopted reforms to the U.K.’s domestic prudential regime on November 17, 2022 (please see “International Regulation” above for more information). We therefore may be required to utilize additional resources to ensure compliance with the different rules in each regime.
If our compliance with Solvency II, the U.K.’s prudential regime or any other regulatory regime is challenged, we may be subject to monetary or other penalties. In addition, in order to ensure compliance with applicable regulatory requirements or as a result of any investigation, including remediation efforts, we could be required to incur significant expenses and undertake additional work, which in turn may divert resources from our business.
We may be unable to maintain all required licenses and approvals and our business may not fully comply with the wide variety of applicable laws and regulations or the relevant authority's interpretation of the laws and regulations. Also, some regulatory authorities have relatively broad discretion to grant, renew or revoke licenses and approvals. If we do not have the requisite licenses and approvals or do not comply with applicable regulatory requirements, the insurance regulatory authorities
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could preclude or temporarily suspend us from carrying on some or all of our activities or monetarily penalize us. Also, changes in the level of regulation of the insurance industry, whether federal, state or foreign, or changes in laws or regulations themselves or interpretations thereof by regulatory authorities, may further restrict the conduct of our business. 
Risks Relating to Our Business
Our expanding international operations expose us to increased investment, political, legal/regulatory, and economic risks, including foreign currency and credit risk.
Our expanding international operations in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, the Asia-Pacific region, South Africa and Australia expose us to increased investment, political, legal/regulatory, and economic risks, including foreign currency and credit risk. Changes in the value of the U.S. dollar relative to other currencies have had and could in the future have an adverse effect on our results of operations and financial condition. 
Our investments in non-U.S.-denominated assets are subject to fluctuations in non-U.S. securities and currency markets, and those markets can be volatile. Non-U.S. currency fluctuations also affect the value of any dividends paid by our non-U.S. subsidiaries to their parent companies in the U.S.
We face additional risks as a result of our international operations which could have an adverse effect on our results of operations and financial condition including: burdens and costs of compliance with a variety of foreign laws and regulations and the associated risk and costs of non-compliance; exposure to undeveloped or evolving legal systems, which may result in unpredictable or inconsistent application of laws and regulations; exposure to commercial, political, legal or regulatory corruption; political, economic or other instability in countries in which we conduct business, including possible terrorist acts; the imposition of tariffs, trade barriers or other protectionist laws or business practices that favor local competition, increased costs and adverse effects on our business; changes to visa or immigration policies; diminished ability to enforce our contractual rights; potential increased risk of data breaches; differences in cultural environments; sociopolitical instability; social, political or economic instability resulting from climate change; changes in regulatory requirements, including changes in regulatory treatment of certain products or services; exposure to local economic conditions and its impact on our clients’ performance and creditworthiness; and restrictions on the repatriation of non-U.S. investments and earnings.
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Our U.K. business could be specifically adversely impacted by the imposition of trade barriers between the EU and the U.K. following Brexit, which has already reduced the level of trade between the two markets and the U.K.’s overall trade exports, thereby negatively affecting the attractiveness of the U.K. market.
We may be unable to attract and retain key personnel and qualified employees.
We depend on our ability to attract and retain key personnel, including our President and CEO, Executive Chairman, senior executive officers, presidents of our businesses, experienced underwriters and other skilled employees who are knowledgeable about our business. If the quality of our underwriting team and other personnel decreases, we may be unable to maintain our current competitive position in the specialized markets in which we operate, and be unable to expand our operations into new products and markets.
We cannot guarantee that our reinsurers will pay in a timely fashion, if at all, and, as a result, we could experience losses. 
We purchase reinsurance by transferring part of the risk that we have assumed, known as ceding, to a reinsurance company in exchange for part of the premium we receive in connection with the risk. Although reinsurance makes the reinsurer contractually liable to us to the extent the risk is transferred or ceded to the reinsurer, it does not relieve us, the reinsured, of our liability to our policyholders. Our reinsurers may not pay the reinsurance recoverables that they owe to us or they may not pay such recoverables on a timely basis. This failure to pay or failure to pay on a timely basis may be due to factors such as whether reinsurers, their affiliates or certain indemnitors have the financial capacity and willingness to make payments under the terms of a reinsurance treaty or contract. Accordingly, we bear credit risk with respect to our reinsurers, and if our reinsurers fail to pay us, our financial results would be adversely affected. Underwriting results and investment returns of some of our reinsurers may affect their future ability to pay claims. As of December 31, 2022,2023, the amount due from our reinsurers was approximately $3,188$3,535 million, including amounts due from state funds and industry pools where it was intended that we would bear no risk. Certain of these amounts are secured by letters of credit or by funds held in trust on our behalf.
We are subject to credit risk relating to our policyholders, independent agents and brokers.
In addition to exposure to credit risk related to our reinsurance recoverables and investment portfolio, we are exposed to credit risk in several other areas of our business, including credit risk relating to policyholders, independent agents and brokers. For example our policyholders, independent agents or brokers may not pay a part of or the full amount of premiums owed to us
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or our brokers or other third party claim administrators may not deliver amounts owed on claims under our insurance and reinsurance contracts for which we have provided funds.
As credit risk is generally a function of the economy, we face a greater credit risk in an economic downturn. While we attempt to manage credit risks through underwriting guidelines, collateral requirements and other oversight mechanisms, our efforts may not be successful. For example, to reduce such credit risk, we require certain third parties to post collateral for some or all of their obligations to us. In cases where we receive pledged securities and the applicable counterparty is unable to honor its obligations, we may be exposed to credit risk on the securities pledged and/or the risk that our access to that collateral may be stayed as a result of bankruptcy. In cases where we receive letters of credit from banks as collateral and one of our counterparties is unable to honor its obligations, we are exposed to the credit risk of the banks that issued the letters of credit.
We are rated by A.M. Best, Standard & Poor's, Moody's, and Fitch, and a decline in these ratings could affect our standing in the insurance industry and cause our sales and earnings to decrease.
Ratings have become an increasingly important factor in establishing the competitive position of insurance companies. Certain of our insurance company subsidiaries are rated by A.M. Best, Standard & Poor's, Moody's and Fitch. Our ratings are subject to periodic review, and we cannot assure you that we will be able to retain our current or any future ratings, especially given that rating agencies may change their criteria or increase capital requirements for various rating levels. For instance, Standard & Poor's has recently proposed changes to its rating model which could impact our rating depending on final changes that are implemented.
If our ratings are reduced from their current levels by A.M. Best, Standard & Poor's, Moody's or Fitch, our competitive position in the insurance industry could suffer and it would be more difficult for us to market our products. A ratings downgrade could also adversely limit our access to capital markets, which may increase the cost of debt. A significant downgrade could result in a substantial loss of business as policyholders move to other companies with higher financial strength ratings.
If market conditions cause reinsurance to be more costly or unavailable, we may be required to bear increased risks or reduce the level of our underwriting commitments.
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As part of our overall risk and capacity management strategy, we purchase reinsurance for certain amounts of risk underwritten by our insurance company subsidiaries, especially catastrophe risks and those risks with relatively high policy limits. We also purchase reinsurance on risks underwritten by others which we reinsure. Market conditions beyond our control determine the availability and cost of the reinsurance protection we seek to purchase, which may affect the level of our business and profitability. Our reinsurance contracts are generally subject to annual renewal, and we may be unable to maintain our current reinsurance contracts or to obtain other reinsurance contracts in adequate amounts and at favorable rates. In addition, we may be unable to obtain reinsurance on terms acceptable to us relating to certain lines of business that we intend to begin writing. If we are unable to renew our expiring contracts or to obtain new reinsurance contracts, either our net exposures would increase or, if we are unwilling to bear an increase in net exposures, we would have to reduce the level of our underwriting commitments, especially catastrophe exposed risks.
Depending on conditions in the financial markets and the general economy, we may be unable to raise debt or equity capital if needed.
If conditions in the financial markets and the general economy are unfavorable, which may result from disruptions, uncertainty or volatility in the capital and credit markets, we may be unable to access debt or equity capital on acceptable terms if needed, which could have a negative impact on our ability to invest in our insurance company subsidiaries and/or to take advantage of opportunities to expand our business, such as possible acquisitions and the creation of new ventures and possible acquisitions, and inhibit our ability to refinance our existing indebtedness if we desire to do so, on terms acceptable to us.
We may not find suitable acquisition candidates or new insurance ventures and acquisition candidates and even if we do, we may not successfully invest in such ventures or successfully integrate any such acquired companies or successfully invest in such ventures.companies.

As part of our present strategy, we continue to evaluate the possible acquisition transactions and the start-up of complementary businesses and acquisition transactions on an ongoing basis, and at any given time we may be engaged in discussions with respect to possible acquisitionsnew ventures and new ventures.acquisitions. We cannot assure you that we will be able to identify suitable insurance ventures or acquisition targets, or insurance ventures, that such transactions will be financed and completed on acceptable terms or that our future acquisitionsstart-up ventures or start-up venturesacquisitions will be successful. Our financial results could be adversely affected by acquired businesses not performing as projected, unforeseen liabilities, routine and unanticipated transaction-related charges, diversion of management time and resources to acquisition integration challenges or growth strategies, loss of key employees, challenges in integrating information technology systems of acquired companies with our own, amortization of expenses related to intangibles, charges
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for impairment of long-term assets or goodwill and indemnification. The process of investing in new ventures or integrating any companies we do acquire or investing in new ventures may have a material adverse effect on our results of operations and financial condition.
If we experience difficulties with our information technology, telecommunications or other computer systems become unavailable or unreliable, our ability to conduct our business could be negatively or severely impacted.    
Our business is highly dependent upon our employees' ability to perform necessary business functions in an efficient and uninterrupted fashion. A shut-down of, or inability to access, one or more of our facilities, a power outage or a failure of one or more of our information technology, telecommunications or other computer systems could significantly impair our employees' ability to perform such functions on a timely basis. In the event of a disaster such as a natural catastrophe, terrorist attack or industrial accident, physical or electronic security breaches, such as breaches by computer hackers, the infection of our systems by a malicious computer virus, denial of service attack, or other cybersecurity incident, our systems could be inaccessible for an extended period of time. In addition, because our information technology and telecommunications systems interface with and depend on third-party systems, we could experience service denials or failures of controls if demand for our service exceeds capacity or a third-party system fails or experiences an interruption. If our business continuity plans or system security does not sufficiently address such a business interruption, system failure or service denial, our ability to write and process new and renewal business, provide customer service, pay claims in a timely manner or perform other necessary business functions could be significantly impaired and our business could be harmed.
Failure to maintain the security of information technology systems and confidential data may expose us to liability.
Although we have taken steps intended to protect our data and information technology systems and mitigate the risk of harm caused by cybersecurity incidents or breaches, no safeguards are perfect and any failure of these safeguards could cause a substantial disruption of our business operations, which could result in service interruptions, data security compromises, regulatory action, and other similar operational and legal issues, as well as substantial remediation and other costs. Our operations rely on the secure processing, storage and transmission of confidential and other sensitive information, including personal information, in our computer systems and networks. Cybersecurity breaches, including physical or electronic break-ins, computer viruses, malware, attacks by hackers, ransomware attacks, phishing attacks, supply chain attacks, breaches due to employee error or misconduct and other similar breaches can create system disruptions, shutdowns or unauthorized access to, or disclosure of, information maintained in our information technology systems and in the information technology systems of our
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vendors and other third parties. We have in the past experienced cybersecurity breaches of our information technology systems as well as the information technology systems of our vendors and other third parties, but, to our knowledge, we have not experienced any material cybersecurity breaches. We expect cybersecurity breaches to continue to occur in the future and we are constantly managing efforts to infiltrate and compromise our systems and data. Our electronic transmission of personal, confidential and proprietary information to third parties with whom we have business relationships and our outsourcing of certain technology and business process functions to third parties may expose us to enhanced risk related to data security. While we attempt to develophave implemented secure data transmission capabilities with these third-party vendors and others with whom we do business, such capabilities may not function as intended and our vendors and third parties could still suffer data breaches that could result in the exposure of sensitive data and the infiltration of our computer systems. Our failure to effectively protect sensitive personal and/or proprietary information, whether owing to breaches of our own systems or those of our vendors and other third parties, could result in significant monetary and reputational damages, material adverse effects to our financial condition, costly litigation, or other regulatory enforcement actions. These increased risks, and expanding regulatory requirements regarding data security, including required compliance with applicable privacy and data protection laws (e.g., the GDPR, CCPA, CPRA and additionalother state-specific privacy statutes and regulations, could expose us to data loss, monetary and reputational damages and significant increases in compliance costs. As a result, our ability to conduct our business could be materially and adversely affected.
We could be adversely affected if our controls to ensure compliance with guidelines, policies and legal and regulatory standards are not effective.    
Our business is highly dependent on our ability to engage on a daily basis in a large number of insurance underwriting, claim processing and investment activities, many of which are highly complex. These activities often are subject to internal guidelines and policies, as well as legal and regulatory standards, including those related to privacy and data security, anti-corruption, anti-bribery and global finance and insurance matters. Our continued expansion into new international markets has brought about additional requirements. A control system, no matter how well designed and operated, can provide only reasonable assurance that the control system's objectives will be met. If our controls are not effective, it could lead to financial loss, unanticipated risk exposure (including underwriting, credit and investment risk), regulatory scrutiny, and/or damage to our reputation.
We could be adversely affected by changes in U.S. Federal income tax laws.
Tax legislation commonly referred to as the Tax Cuts and Jobs Act, which was signed into law on December 22, 2017, fundamentally overhauled the U.S. tax system by, among other significant changes, reducing the U.S. corporate income tax rate to 21%. In the context of the taxation of U.S. property/casualty insurance companies such as the Company, the Act also modified the loss reserve discounting rules and the proration rules that apply to reduce reserve deductions to reflect the lower
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corporate income tax rate. It is possible that other legislation could be introduced and enacted by the current Congress or future Congresses that could have an adverse impact on us. New regulations or pronouncements interpreting or clarifying provisions of the Act may be forthcoming. We cannot predict if, when or in what form such regulations or pronouncements may be provided, whether such guidance will have a retroactive effect or their potential impact on us.
Limitations in risk management and loss limitation methods may adversely impact our business.
We seek to effectively manage risk and limit our losses in a variety of ways including through effective underwriting, tailoring policy terms, and the use of reinsurance. However, there are certain limitations in these and similar tactics and as a result, loss levels may be higher than modeled or otherwise expected, which could have a material adverse effect on our business.
Increased scrutiny on social responsibility and the efforts we take to implement related measures, or the failure to take such measures, may adversely impact our business.
There is increased scrutiny from regulators and investors on the measures companies take to be socially responsible. Although we have made efforts to be responsible in this manner, for example through our commitment to fostering a unifying culture and encouraging innovation across our operating units, these types of pressures may nonetheless present challenges and have an adverse impact on our business. In addition, we may be subject to negative publicity based on a failure or perceived failure to achieve various social responsibility initiatives and goals relating to diversity, equity and inclusion, and commitment to long-term sustainability we may announce from time to time, or based on an actual or perceived increase in related risks as a result of our or our industry’s business activities.
Risks Relating to Our Investments 
A significant amount of our assets is invested in fixed maturity securities and is subject to market fluctuations. 
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Our investment portfolio consists substantially of fixed maturity securities. As of December 31, 2022,2023, our investment in fixed maturity securities was approximately $17.6$20.2 billion, or 72.4%75.8% of our total investment portfolio including cash and cash equivalents. As of that date, our portfolio of fixed maturity securities consisted of the following types of securities: U.S. Government securities (5.1%(8.4%); state and municipal securities (16.8%(13.3%); corporate securities (38.1%(37.9%); asset-backed securities (22.6%(20.8%); mortgage-backed securities (9.4%(11.3%) and foreign government (8.0%(8.3%). 
The fair value of these assets and the investment income from these assets fluctuate depending on general economic and market conditions. The fair value of fixed maturity securities generally decreases as interest rates rise. If a significant increase in interest rates were to occur, the fair value of our fixed maturity securities would be negatively impacted, while investment income earned from future investments in fixed-maturityfixed maturity securities would be higher. Conversely, if interest rates decline, the fair value of our fixed-maturityfixed maturity securities would be positively impacted, and investment income earned from future investments in fixed maturity securities will be lower. Some fixed maturity securities, such as mortgage-backed and other asset-backed securities, also carry prepayment risk as a result of interest rate fluctuations. In low interest rate environments, we may not be able to successfully reinvest the proceeds from maturing securities at yields commensurate with our target performance goals.
The value of investments in fixed maturity securities is subject to impairment as a result of deterioration in the credit worthiness of the issuer, default by the issuer (including states and municipalities) in the performance of its obligations in respect of the securities and/or increases in market interest rates. To a large degree, the credit risk we face is a function of the economy; accordingly, we face a greater risk in an economic downturn or recession. During periods of market disruption, it may be difficult to value certain of our securities, particularly if trading becomes less frequent and/or market data becomes less observable. There may be certain asset classes that were in active markets with significant observable data that become illiquid due to the then current financial environment. In such cases, more securities may require additional subjectivity and management judgment.
Although the historical rates of default on state and municipal securities have been relatively low, our state and municipal fixed maturity securities could be subject to a higher risk of default or impairment due to declining municipal tax bases and revenue. Many states and municipalities operate under deficits or projected deficits, the severity and duration of which could have an adverse impact on both the valuation of our state and municipal fixed maturity securities and the issuer's ability to perform its obligations thereunder. Additionally, our investments are subject to losses as a result of a general decrease in commercial and economic activity for an industry sector in which we invest, as well as risks inherent in particular securities.
Although we attempt to manage these risks through the use of investment guidelines and other oversight mechanisms and by diversifying our portfolio and emphasizing preservation of principal, our efforts may not be successful. Impairments, defaults and/or rate increases could reduce our net investment income or realized and net realizedunrealized investment gains or result in investment
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losses. Investment returns are currently, and will likely continue to remain, under pressure due tobe, impacted by economic uncertainty, more generally, and the shape of the yield curve. As a result, our exposure to the risks described above could materially and adversely affect our results of operations, liquidity and financial condition.
We have invested a portion of our assets in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets, which are subject to significant volatility and may decline in value.
We invest a portion of our investment portfolio in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets. At December 31, 2022,2023, our investment in these assets was approximately $5.3$5.1 billion, or 21.6%19.1%, of our investment portfolio, including cash and cash equivalents.
Merger and arbitrage trading securities were $0.9 billion, or 3.9%3.5% of our investment portfolio, including cash and cash equivalents at December 31, 2022.2023. Merger arbitrage involves investing in the securities of publicly held companies that are the targets in announced tender offers and mergers. Merger arbitrage differs from other types of investments in its focus on transactions and events believed likely to bring about a change in value over a relatively short time period, usually four months or less. Our merger arbitrage positions are exposed to the risk associated with the completion of announced deals, which are subject to regulatory as well as political and other risks.
Real estate related investments, including directly owned, investment funds and loans receivable, were $1.7 billion, or 7.1%6.2% of our investment portfolio, including cash and cash equivalents, at December 31, 2022.2023. We also invest in real estate, financial services, energy, transportation and other investment funds. The values of these investments are subject to fluctuation based on changes in the economy and interest rates in general and the related asset valuations in particular. In addition, our investments in real estate related assets and other alternative investments are less liquid than our other investments.
These investments are subject to significant volatility as a result of the conditions in the financial and commodity markets and the global economy.
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Risks Relating to Limitations on Dividends from Subsidiaries and Anti-Takeover Provisions
We are an insurance holding company and, therefore, may not be able to receive dividends in needed amounts.
As an insurance holding company, our principal assets are the shares of capital stock of our insurance company subsidiaries. We have to rely on dividends from our insurance company subsidiaries to meet our obligations for paying principal and interest on outstanding debt obligations, paying dividends to stockholders and repurchasing our shares and paying corporate expenses. The payment of dividends by our insurance company subsidiaries is subject to regulatory restrictions and competitive pressures on maintaining financial strength ratings and will depend on the surplus and future earnings of these subsidiaries. During 2023,2024, the maximum amount of dividends that can be paid without regulatory approval is approximately $1.2 billion. Future regulatory actions could further restrict our insurance subsidiaries’ ability to pay us dividends. As a result, in the future we may not be able to receive dividends from these subsidiaries at times and in amounts necessary to meet our obligations, pay dividends or repurchase shares.
Laws and regulations of the jurisdictions in which we conduct business could delay, deter or prevent an attempt to acquire control of us that stockholders might consider to be desirable, and may restrict a stockholder's ability to purchase our common stock.
Generally, United States insurance holding company laws require that, before a person can acquire control of an insurance company, prior written approval must be obtained from the insurance regulatory authority in the state in which that insurance company is domiciled. Pursuant to applicable laws and regulations, “control” over an insurer is generally presumed to exist if any person, directly or indirectly, owns, controls, holds the power to vote, or holds proxies representing 10% or more of the voting securities of that insurer or any parent company of such insurer. Indirect ownership includes ownership of the shares of our common stock. Thus, the insurance regulatory authorities of the states in which our insurance subsidiaries are domiciled are likely to apply these restrictions on acquisition of control to any proposed acquisition of our common stock. Some states require a person seeking to acquire control of an insurer licensed but not domiciled in that state to make a filing prior to completing an acquisition if the acquirer and its affiliates, on the one hand, and the target insurer and its affiliates, on the other hand, have specified market shares in the same lines of insurance in that state. Additionally, many foreign jurisdictions where we conduct business impose similar restrictions and requirements.
These provisions can also lead to the imposition of conditions on an acquisition that could delay or prevent its consummation. These laws may discourage potential acquisition proposals and may delay, deter or prevent a change in control of us through transactions, and in particular unsolicited transactions, that some or all of our stockholders might consider to be desirable. 
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Certain provisions in our organizational documents may have the effect of hindering, delaying or preventing third party takeovers and thus may prevent our stockholders from receiving premium prices for their shares in an unsolicited takeover or make it more difficult for third parties to replace our current management.
Provisions of our Restated Certificate of Incorporation and By-Laws, as well as state insurance statutes, may hinder, delay or prevent unsolicited acquisitions or changes of our control. These provisions may also have the effect of making it more difficult for third parties to cause the replacement of our current management without the concurrence of our boardBoard of directors.Directors. 
These provisions include:
•our classified board of directors and the ability of our board to increase its size and to appoint directors to fill newly created directorships;
•the requirement that the holders of 80% of our shares must approve mergers and other transactions between us and the holder of 5% or more of our shares, unless the transaction was approved by our board of directors prior to such holder's acquisition of 5% of our shares; and
•the need for advance notice in order to raise business or make nominations at stockholders' meetings.
These provisions may discourage potential acquisition proposals and may delay, deter or prevent a change in control of us through transactions, and in particular unsolicited transactions, that some or all of our stockholders might consider to be desirable.



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ITEM 1B. UNRESOLVED STAFF COMMENTS

There are no unresolved written comments that were received from the SEC staff 180 days or more before the end of our fiscal year relating to our periodic or current reports under the Securities Exchange Act of 1934.

ITEM 1C. CYBERSECURITY
Cybersecurity Strategy and Risk Management Program
The Company has a documented information security program (the Program) to identify, assess, monitor and manage potential cybersecurity threats and incidents. The Program is designed to protect the confidentiality, integrity and availability of our information systems and assets that store, process, or transmit information. The Program is modeled on the global standard for risk assessment, International Organization for Standardization 27001, and is guided by the six domains of cybersecurity established by the National Institute of Standards and Technology Cybersecurity Framework (i.e., govern, identify, protect, detect, respond, and recovery). The Program seeks to adhere to applicable U.S. and international laws and regulations, including New York State’s cybersecurity regulation applicable to financial services institutions authorized by the New York State Department of Financial Services.
The Program’s security and risk policies and standards, implemented by either the Company or third party assessors or consultants, include:
–information security management tools, such as firewalls, intrusion prevention and detection systems, anti-malware functionality, and access privilege controls;
–vulnerability management, including penetration and control testing and vulnerability scans of information systems;
–incident monitoring, breach notification and escalation, including disaster recovery and incident response plans and resources;
–risk based assessment of third party service providers; and
–annual cybersecurity awareness training for employees and contractors.
The Company has not identified any cybersecurity incidents that have materially affected or are reasonably likely to materially affect the Company, including its business strategy, results of operations, or financial condition, for the period covered by this annual report. For a discussion regarding risks associated with cybersecurity threats, see Risk Factors – Risks Relating to Our Business – “If our information technology, telecommunications or other computer systems become unavailable or unreliable, our ability to conduct our business could be negatively or severely impacted” and “Failure to maintain the security of information technology systems and confidential data may expose us to liability.”
Board Oversight, Governance and Risk Management
The entire Board of Directors has oversight of risks from cybersecurity threats and receives periodic updates on such risks from the Company’s management, including from the Company’s President and CEO and its Vice President, Chief Information Security Officer (CISO).
Our CISO is principally responsible for assessing and managing all aspects of the Program, including the Company’s Regional Information Security Officers (RISOs), third-party consultants, development of industry trends and control testing and tracking by risk level. Our CISO meets periodically with senior executives, including the Company’s President and Chief Executive Officer, to discuss the Company’s cybersecurity strategy, and its monitoring, prevention, detection, mitigation, and remediation of cybersecurity risks. Regular reporting on the Program is also provided to the Company’s Enterprise Risk Management Committee, which is comprised of the President and CEO, Senior Vice President – Enterprise Risk Management, Executive Vice President – Investments, Executive Vice President – Chief Financial Officer, Executive Vice President – Secretary, and the Of Counsel and Assistant Secretary. Collectively, the CISO and RISOs, along with their teams, in collaboration with the technology and business owners, implement the Program. Legal, Compliance, and Internal Audit functions also assess the Program’s adherence to regulatory requirements and internal controls.
In the event of a potentially material cybersecurity incident, the Company’s incident response plans establish escalation protocols for relevant IT leaders and functional leaders within Enterprise Risk Management, Legal, Compliance and Internal Audit to engage management as appropriate.
Our CISO has over 25 years of information security experience and is licensed as a Certified Information Systems Security Professional.
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ITEM 2. PROPERTIES

W. R. Berkley and its subsidiaries own or lease office buildings or office space suitable to conduct their operations. At December 31, 2022,2023, the Company had aggregate office space of 4,295,1654,333,225 square feet, of which 1,048,1361,042,156 were owned and 3,247,0293,291,069 were leased.
Rental expense for the Company's operations was approximately $44,256,000, $43,383,000 and $44,051,000 for 2023, 2022 and $44,291,000 for 2022, 2021, and 2020, respectively. Future minimum lease payments, without provision for sublease income, are $32,282,796 in 2023, $33,528,105$50,222,000 in 2024, $41,249,000 in 2025 and $599,371,375$166,192,000 thereafter.

ITEM 3. LEGAL PROCEEDINGS

The Company's subsidiaries are subject to disputes, including litigation and arbitration, arising in the ordinary course of their insurance and reinsurance businesses. The Company's estimates of the costs of settling such matters are reflected in its aggregate reserves for losses and loss expenses, and the Company does not believe that the ultimate outcome of such matters will have a material adverse effect on its financial condition or results of operations.

On December 22, 2023, one of the Company’s subsidiaries filed a lawsuit against certain reinsurers to recover in excess of $90 million in respect of certain losses paid to its policyholders under certain event cancellation and related insurance policies. The Company believes its claims against the reinsurers are meritorious and expects a positive resolution to its lawsuit. Whilean adverse outcome is possible, the Company believes that the outcome, in any case, will notbe material to the Company’s financial condition.
ITEM 4. MINE SAFETY DISCLOSURES
Not applicable.
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PART II
ITEM 5. MARKET FOR THE REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
The common stock of the Company is traded on the New York Stock Exchange under the symbol “WRB”.
In 2022,2023, the Board declared regular quarterly cash dividends of $0.09$0.10 per share in the first quarter and $0.10$0.11 per share in each of the remaining three quarters, andas well as special dividends of $0.50 per share in the second quarter. Subject to availability, the Board currently expects to continue such regular quarterly cash dividends.first, third, and fourth quarters, for a total of $501 million in aggregate dividends in 2023.

The approximate number of record holders of the common stock on February 15, 20232024 was 323.327.
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The chart below shows a comparison of 5 year cumulative total return.
Comparison of 5 Year Cumulative Total Return
Assumes initial investment of $100 on January 1, 2017,2018, with dividends reinvested.

wrb-20221231_g1.jpg732
As of December 31, 2022,2023, the S&P 500® Property and Casualty Insurance Index consists of The Allstate Corporation, Arch Capital Group Ltd. (added Nov. 2022), Chubb Ltd.,Limited, Cincinnati Financial Corporation, The Hartford Financial Services Group, Inc., Loews Corporation (CNA), The Progressive Corporation, The Travelers Companies, Inc., and W. R. Berkley Corporation (added Dec. 2019).
201720182019202020212022
2018201820192020202120222023
W. R. Berkley CorporationW. R. Berkley CorporationCum $100.00104.61150.46145.72185.56240.56W. R. Berkley CorporationCum $100.00143.83139.30177.37237.46238.04
S&P 500 Index - Total ReturnsS&P 500 Index - Total ReturnsCum $100.0095.61125.70148.81191.48156.69S&P 500 Index - Total ReturnsCum $100.00131.48155.64200.28163.89207.05
S&P 500 Property and Casualty Insurance IndexS&P 500 Property and Casualty Insurance IndexCum $100.0095.31119.97127.56149.90178.27S&P 500 Property and Casualty Insurance IndexCum $100.00125.87133.84157.28187.04207.20
Set forth below is a summary of the shares repurchased by the Company during the fourth quarter of 20222023 and the remaining number of shares authorized for purchase by the Company during such period.
Total Number of
Shares Purchased		Average Price
Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or ProgramsMaximum Number of Shares that may yet be Purchased Under the Plans or Programs
October 2022325,596 $69.22 325,596 14,568,100 
November 2022938,494 69.29 938,494 13,629,606 
December 2022— — — 13,629,606 
Total Number of
Shares Purchased		Average Price
Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or ProgramsMaximum Number of Shares that may yet be Purchased Under the Plans or Programs
October 2023371,497 $63.75 371,497 14,430,487 
November 2023— — — 14,430,487 
December 20231,189,204 69.75 1,189,204 13,241,283 

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

Overview
W. R. Berkley Corporation is an insurance holding company that is among the largest commercial lines writers in the United States and operates worldwide in two segments of the property and casualty business: Insurance and Reinsurance & Monoline Excess. Our decentralized structure provides us with the flexibility to respond quickly and efficiently to local or specific market conditions and to pursue specialty business niches. It also allows us to be closer to our customers in order to better understand their individual needs and risk characteristics. While providing our business units with certain operating autonomy, our structure allows us to capitalize on the benefits of economies of scale through centralized capital, investment, reinsurance, enterprise risk management, and actuarial, financial and corporate legal staffcompliance support. The Company’s primary sources of revenues and earnings are its insurance operations and its investments.
An important part of our strategy is to form new businesses to capitalize on various opportunities. Over the years, the Company has formed numerous businesses that are focused on important parts of the economy in the U.S., including healthcare, cyber security, energy and agriculture, and on growing international markets, including the Asia-Pacific region, South America and Mexico.
The profitability of the Company’s insurance business is affected primarily by the adequacy of premium rates. The ultimate adequacy of premium rates is not known with certainty at the time an insurance policy is issued because premiums are determined before claims are reported. The ultimate adequacy of premium rates is affected mainly by the severity and frequency of claims, which are influenced by many factors, including natural and other disasters, regulatory measures and court decisions that define and change the extent of coverage and the effects of economic or social inflation on the amount of compensation for injuries or losses. General insurance prices are also influenced by available insurance capacity, i.e., the level of capital employed in the industry, and the industry’s willingness to deploy that capital.
The Company’s profitability is also affected by its investment income and investment gains. The Company’s invested assets are invested principally in fixed maturity securities. The return on fixed maturity securities is affected primarily by general interest rates, as well as the credit quality and duration of the securities.
The Company also invests in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets. The Company's investments in investment funds and its other alternative investments have experienced, and the Company expects to continue to experience, greater fluctuations in investment income. The Company's share of the earnings or losses from investment funds is generally reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.
On February 25, 2022, the Company announced that its Board of Directors approved a 3-for-2 common stock split which was paid in the form of a stock dividend to holders of record as ofIn March 9, 2022. The additional shares were issued on March 23, 2022. Shares outstanding and per share amounts in this Form 10-K reflect such 3-for-2 common stock split.
On March 7, 2022, the Company sold a real estate investment consisting of an office building located in London for £718 million. The Company realized a pretax gain of $317 million in the first quarter of 2022, before transaction expenses and the impact of foreign currency, including the reversal of the currency translation adjustment. The gain was $251 million after such adjustments.
The COVID-19 pandemic, includingIn June 2023, the related impactCompany completed a sale of the property and casualty insurance services division of Breckenridge IS, Inc. and recognized a pre-tax net realized gain on the U.S. and global economies, continued to adversely affect our resultsinvestment of operations. At the same time, COVID-19 has led to reduced loss frequency in certain lines of business (which partially returned to pre-pandemic levels as many economies and legal systems have reopened). $89 million.
The ultimate impact of COVID-19 on the economy and the Company’s results of operations, financial position and liquidity is not within the Company’s control and remains unclear due to, among other factors, its ongoing impact and uncertainty in connection with its claims, reserves and reinsurance recoverables.



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Critical Accounting Estimates
The following presents a discussion of accounting policies and estimates relating to reserves for losses and loss expenses, assumed reinsurance premiums and other-than-temporary impairments of investments. Management believes these policies and estimates are the most critical to its operations and require the most difficult, subjective and complex judgments.
Reserves for Losses and Loss Expenses. To recognize liabilities for unpaid losses, either known or unknown, insurers establish reserves, which is a balance sheet account representing estimates of future amounts needed to pay claims and related expenses with respect to insured events which have occurred. Estimates and assumptions relating to reserves for losses and loss expenses are based on complex and subjective judgments, often including the interplay of specific uncertainties with related accounting and actuarial measurements. Such estimates are also susceptible to change as significant periods of time may elapse between the occurrence of an insured loss, the report of the loss to the insurer, the ultimate determination of the cost of the loss and the insurer’s payment of that loss.
In general, when a claim is reported, claims personnel establish a “case reserve” for the estimated amount of the ultimate payment based upon known information about the claim at that time. The estimate represents an informed judgment based on general reserving practices and reflects the experience and knowledge of the claims personnel regarding the nature and value of the specific type of claim. Reserves are also established on an aggregate basis to provide for losses incurred but not reported (“IBNR”) to the insurer, potential inadequacy of case reserves and the estimated expenses of settling claims, including legal and other fees and general expenses of administrating the claims adjustment process. Reserves are established based upon the then current legal interpretation of coverage provided.
In examining reserve adequacy, several factors are considered in estimating the ultimate economic value of losses. These factors include, among other things, historical data, legal developments, changes in social attitudes and economic conditions, including the effects of inflation. The actuarial process relies on the basic assumption that past experience, adjusted judgmentally for the effects of current developments and anticipated trends, is an appropriate basis for predicting future outcomes. Reserve amounts are based on management’s informed estimates and judgments using currently available data. As additional experience and other data become available and are reviewed, these estimates and judgments may be revised. This may result in reserve increases or decreases that would be reflected in our results in periods in which such estimates and assumptions are changed.
Reserves do not represent a certain calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claim administration will cost. While the methods for establishing reserves are well tested over time, the major assumptions about anticipated loss emergence patterns are subject to uncertainty. These estimates, which generally involve actuarial projections, are based on management’s assessment of facts and circumstances then known, as well as estimates of trends in claims severity and frequency, judicial theories of liability and other factors, including the actions of third parties which are beyond the Company’s control. These variables are affected by external and internal events, such as inflation and economic volatility, judicial and litigation trends, reinsurance coverage, legislative changes and claim handling and reserving practices, which make it more difficult to accurately predict claim costs. The inherent uncertainties of estimating reserves are greater for certain types of liabilities where long periods of time elapse before a definitive determination of liability is made. Because setting reserves is inherently uncertain, the Company cannot provide assurance that its current reserves will prove adequate in light of subsequent events.
Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each business. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. For example, the paid loss and incurred loss development methods rely on historical paid and incurred loss data. For new lines of business, where there is insufficient history of paid and incurred claims data, or in circumstances where there have been significant changes in claim practices, the paid and incurred loss development methods would be less credible than other actuarial methods. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” and in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each business.
The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions. Examples of changes in terms and conditions that can have a significant impact on reserve levels are the use of aggregate policy limits, the expansion of coverage exclusions, whether or not defense costs are within policy limits, and changes in deductibles and attachment points.
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The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is priced and written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each business. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns. Management believes the estimates and assumptions it makes in the reserving process provide the best estimate of the ultimate cost of settling claims and related expenses with respect to insured events which have occurred; however, different assumptions and variables could lead to significantly different reserve estimates.
Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.
Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile,auto, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of businesses with short reporting lags than for lines of business with long reporting lags.
The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed. If the actual level of loss frequency and severity are higher or lower than expected, the ultimate losses will be different than management’s estimate. The following table reflects the impact of changes (which could be favorable or unfavorable) in frequency and severity, relative to our assumptions, on our loss estimate for claims occurring in 2022:2023:
(In thousands)(In thousands)Frequency (+/-)(In thousands)Frequency (+/-)
Severity (+/-)Severity (+/-)1%5%10%Severity (+/-)1%5%10%
1%1%$116,072 $349,370 $640,993 
5%5%349,370 591,908 895,081 
10%10%640,993 895,081 1,212,690 
Our net reserves for losses and loss expenses of approximately $14.2$15.7 billion as of December 31, 20222023 relate to multiple accident years. Therefore, the impact of changes in frequency or severity for more than one accident year could be higher or lower than the amounts reflected above. The impact of such changes would likely be manifested gradually over the course of many years, as the magnitude of the changes became evident.
Approximately $3.0$3.1 billion, or 21%20%, of the Company’s net loss reserves as of December 31, 20222023 relate to the Reinsurance & Monoline Excess segment. There is a higher degree of uncertainty and greater variability regarding estimates of excess workers' compensation and assumed reinsurance loss reserves. In the case of excess workers’ compensation, our policies generally attach at $1 million or higher. The claims which reach our layer therefore tend to involve the most serious injuries and many remain open for the lifetime of the claimant, which extends the claim settlement tail. These claims also occur less frequently but tend to be larger than primary claims, which increases claim variability. In the case of assumed reinsurance our loss reserve estimates are based, in part, upon information received from ceding companies. If information received from ceding companies is not timely or correct, the Company’s estimate of ultimate losses may not be accurate. Furthermore, due to
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delayed reporting of claim information by ceding companies, the claim settlement tail for assumed reinsurance is also extended. Management considers the impact of delayed reporting and the extended tail in its selection of loss development factors for these lines of business.
Information received from ceding companies is used to set initial expected loss ratios, to establish case reserves and to estimate reserves for incurred but not reported losses on assumed reinsurance business. This information, which is generally provided through reinsurance intermediaries, is gathered through the underwriting process and from periodic claim reports and other correspondence with ceding companies. The Company performs underwriting and claim audits of selected ceding companies to determine the accuracy and completeness of information provided to the Company. The information received from the ceding companies is supplemented by the Company’s own loss development experience with similar lines of business as well as industry loss trends and loss development benchmarks.
Following is a summary of the Company’s reserves for losses and loss expenses by business segment as of December 31, 20222023 and 2021:2022:
 
(In thousands)(In thousands)20222021(In thousands)20232022
InsuranceInsurance$11,233,924 $10,060,420 
Reinsurance & Monoline ExcessReinsurance & Monoline Excess3,014,955 2,787,942 
Net reserves for losses and loss expensesNet reserves for losses and loss expenses14,248,879 12,848,362 
Ceded reserves for losses and loss expensesCeded reserves for losses and loss expenses2,762,344 2,542,526 
Gross reserves for losses and loss expensesGross reserves for losses and loss expenses$17,011,223 $15,390,888 

Following is a summary of the Company’s net reserves for losses and loss expenses by major line of business as of December 31, 20222023 and 2021:2022:
 
(In thousands)(In thousands)Reported Case
Reserves		Incurred But
Not Reported		Total(In thousands)Reported Case
Reserves		Incurred But
Not Reported		Total
December 31, 2022
December 31, 2023
Other liability
Other liability
Other liabilityOther liability$1,808,700 $3,826,444 $5,635,144 
Workers’ compensation (1)Workers’ compensation (1)1,023,961 899,215 1,923,176 
Professional liabilityProfessional liability501,572 1,243,604 1,745,176 
Commercial automobile629,149 528,398 1,157,547 
Auto
Short-tail lines (2)Short-tail lines (2)403,974 368,907 772,881 
Total InsuranceTotal Insurance4,367,356 6,866,568 11,233,924 
Reinsurance & Monoline Excess (1) (3)Reinsurance & Monoline Excess (1) (3)1,551,687 1,463,268 3,014,955 
TotalTotal$5,919,043 $8,329,836 $14,248,879 
December 31, 2021
December 31, 2022
Other liability
Other liability
Other liabilityOther liability$1,724,907 $3,319,665 $5,044,572 
Workers’ compensation (1)Workers’ compensation (1)1,016,014 903,448 1,919,462 
Professional liabilityProfessional liability468,680 1,019,344 1,488,024 
Commercial automobile504,821 424,382 929,203 
Auto
Short-tail lines (2)Short-tail lines (2)322,917 356,242 679,159 
Total InsuranceTotal Insurance4,037,339 6,023,081 10,060,420 
Reinsurance & Monoline Excess (1) (3)Reinsurance & Monoline Excess (1) (3)1,475,623 1,312,319 2,787,942 
TotalTotal$5,512,962 $7,335,400 $12,848,362 
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(1)Reserves for excess and assumed workers’ compensation business are net of an aggregate net discount of $416$390 million and $452$416 million as of December 31, 20222023 and 2021,2022, respectively.
(2)Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery, high net worth homeowners and other lines.
(3)Reinsurance & Monoline Excess includes property and casualty reinsurance as well as operations that solely retain risk on an excess basis.
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The Company evaluates reserves for losses and loss expenses on a quarterly basis. Changes in estimates of prior year losses are reported when such changes are made. The changes in prior year loss reserve estimates are generally the result of ongoing analysis of recent loss development trends. Original estimates are increased or decreased as additional information becomes known regarding individual claims and aggregate claim trends.
Certain of the Company's insurance and reinsurance contracts are retrospectively rated, whereby the Company collects more or less premiums based on the level of loss activity. For those contracts, changes in loss and loss expenses for prior years may be fully or partially offset by additional or return premiums.
Net prior year development (i.e, the sum of prior year reserve changes and prior year earned premiums changes) for each of the last three years ended December 31, are as follows:
(In thousands)(In thousands)202220212020
(In thousands)
(In thousands)
Increase in prior year loss reserves
Increase in prior year loss reserves
Increase in prior year loss reservesIncrease in prior year loss reserves$(54,511)$(863)$(627)
Increase in prior year earned premiumsIncrease in prior year earned premiums18,106 7,510 16,807 
Increase in prior year earned premiums
Increase in prior year earned premiums
Net (unfavorable) favorable prior year developmentNet (unfavorable) favorable prior year development$(36,405)$6,647 $16,180 
Net (unfavorable) favorable prior year development
Net (unfavorable) favorable prior year development
The COVID-19 global pandemic has impacted, and may further impact, the Company’s results through its effect on claim frequency and severity. Loss cost trends have been impacted and may be further impacted by COVID-19-related claims in certain lines of business. Losses incurred from COVID-19-related claims have been offset, to a certain extent, by lower claim frequency in certain lines of our businesses; however, asloss costs. Accordingly, the economy and legal systems have reopened, the benefit of lower claim frequency has partially abated. The ultimate net impact of COVID-19 on the CompanyCompany's reserves remains uncertain. New variants of the COVID-19 virus continue to create risks with respect to loss costs and the potential for renewed impact of the other effects of COVID-19 associated with economic conditions, inflation, and social distancing and work from home rules.
Most of the COVID-19-related claims reported to the Company to date involve certain short-tailed lines of business, including contingency and event cancellation, business interruption, and film production delay. The Company has also received COVID-19-related claims for longer-tailed casualty lines of business such as workers’ compensation and other liability; however, the estimated incurred loss impact for these reported claims are not material at this time. Given the continuing uncertainty regarding the pandemic's pervasiveness, the future impact that the pandemic may have on claim frequency and severity remains uncertain at this time.
The Company has estimated the potential COVID-19 impact to its contingency and event cancellation, workers’ compensation, and other lines of business under a number of possible scenarios; however, due to COVID-19’s continued evolving impact, there remains uncertainty around the Company’s COVID-19 reserves. In addition, should the pandemic continue or worsen as a result of new COVID-19 variants or otherwise, governments in the jurisdictions where we operate may impose restrictions, including lockdowns, as well as renew their efforts to expand policy coverage terms beyond the policy’s intended coverage. Accordingly, losses arising from these actions, and the other factors described above, could exceed the Company’s reserves established for those related policies.
As of December 31, 2022,2023, the Company had recognized losses for COVID-19-related claims activity, net of reinsurance, of approximately $341$384 million, of which $290$326 million relates to the Insurance segment and $51$58 million relates to the Reinsurance & Monoline Excess segment. Such $341$384 million of COVID-19-related losses included $337$381 million of reported losses and $4$3 million of IBNR. For the year ended December 31, 2022,2023, the Company recognized current accident year losses for COVID-19-related claims activity, net of reinsurance, of approximately $5$1 million, all of which $3 million relates to the Insurance segment.
Unfavorable prior year development (net of additional and return premiums) was $19 million in 2023.
Insurance – Reserves for the Insurance segment developed unfavorably by $24 million in 2023 (net of additional and $2 million relatesreturn premiums).The unfavorable development for the segment was concentrated in the early part of the year, with reserve development being flat overall during the second half of 2023.A key driver of the unfavorable development early in 2023 was property catastrophe losses related to 2022 events which were still being adjusted and settled during the early part of 2023.In particular, losses related to U.S. winter storms which occurred during the month of December 2022 were a significant contributor to the development, as information gathering and evaluation of many of these claims were still ongoing into the new year.
In addition to the property prior year development discussed above, during 2023 the Insurance segment also experienced adverse prior year development on casualty lines of business for the 2016 through 2019 accident years, which was offset by favorable prior year development on casualty lines of business for the 2020 through 2022 accident years. The unfavorable development on the 2016 through 2019 accident years was concentrated in the general liability and commercial auto liability lines of business. The development, which particularly impacted business attaching excess of primary policy limits, was driven by a larger than expected number of large losses reported. The Company believes social inflation is contributing to an increase in the frequency of large losses for these accident years. Social inflation can include higher settlement demands from plaintiffs, use of tactics such as litigation funding by the plaintiffs’ bar, negative public sentiment towards large businesses and corporations, and erosion of tort reforms, among others.
The favorable prior year development on casualty lines for the 2020 through 2022 accident years in the Insurance segment was concentrated in the professional liability, workers’ compensation, and general liability lines of business. Due to elevated uncertainty regarding incurred loss frequency and severity as a result of ongoing social inflation and the impacts of the COVID-19 pandemic, the Company set its initial loss ratios for the 2020 through 2022 accident years prudently, and largely maintained these estimates through the end of each respective accident year. The reported loss experience to date for these lines of business for the 2020 through 2022 accident years has been significantly better than was expected, and the Company has begun to react to this favorable emergence as the accident years mature beyond the age of twelve months. It should also be noted that commercial auto liability experienced adverse prior year development for the 2020 through 2022 accident years, which partially offset the favorable development discussed above; the adverse development was driven by a larger than expected number of large losses reported.
Reinsurance & Monoline Excess – Reserves for the Reinsurance & Monoline Excess segment.segment developed favorably by $5 million in 2023 (net of additional and return premiums). The overall favorable prior year development for the segment was driven mainly by favorable development in excess workers’ compensation, substantially offset by unfavorable development in the non-proportional reinsurance assumed liability and excess general liability (including umbrella) lines of business.The favorable excess workers’ compensation development was driven by continued lower claim frequency and reported losses
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relative to our expectations, and to favorable claim settlements.The favorable development was spread across many prior accident years.The unfavorable development for non-proportional reinsurance assumed liability and excess general liability was associated primarily with our U.S. assumed reinsurance business, and related to accounts reinsuring excess and umbrella business and construction projects.The adverse development was concentrated mainly in accident years 2017 through 2020.
Unfavorable prior year development (net of additional and return premiums) was $36 million in 2022.
Insurance – Reserves for the Insurance segment developed unfavorably by $40 million in 2022 (net of additional and return premiums). The unfavorable development in the segment primarily related to COVID-19 losses at two businesses. These businesses wrote policies providing coverage for event cancellation and film production delay which were heavily impacted by losses directly caused by the COVID-19 pandemic. Most of this COVID-19 related unfavorable development emerged during the third quarter as a result of settlements of claims at values higher than our expectations. However, the Company believes that as a result of these settlements the remaining level of uncertainty around the ultimate value of its known COVID-19 claims has been significantly reduced.
The unfavorable development mentioned above also includes favorable prior year development for the Insurance segment primarily attributable to the 2020 and 2021 accident years and unfavorable development on the 2015 through 2019 accident years. The favorable development on the 2020 and 2021 accident years was concentrated in certain casualty lines of business including general liability, professional liability, and workers’ compensation. The Company experienced lower
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reported claim frequency in these lines of business during 2020 and 2021 relative to historical averages, and continued to experience lower reported incurred losses relative to its expectations for these accident years as they developed during 2022. These trends began in 2020 and we believe were caused by the impacts of the COVID-19 pandemic, including for example, lockdowns, reduced driving/traffic and increased work from home. Due to the ongoing uncertainty regarding the ultimate impacts of the pandemic on accident years 2020 and 2021 incurred losses, the Company has beenwas cautious in reacting to these lower trends in setting and updating its loss ratio estimates for these years. As these accident years have continued to mature, the Company has continued to recognize some of the favorable reported experience in its ultimate loss estimates made during 2022.
The unfavorable development on the 2015 through 2019 accident years was concentrated in the general liability and professional liability, including medical professional, lines of business, as well as commercial auto liability. The development was driven by a larger than expected number of large losses reported. The Company believes social inflation is contributing to an increase in the frequency of large losses for these accident years. Social inflation can include higher settlement demands from plaintiffs, use of tactics such as litigation funding by the plaintiffs’ bar, negative public sentiment towards large businesses and corporations, and erosion of tort reforms, among others.
Reinsurance & Monoline Excess – Reserves for the Reinsurance & Monoline Excess segment developed favorably by $4 million in 2022 (net of additional and return premiums). The overall favorable development for the segment was driven mainly by favorable development in excess workers compensation, substantially offset by unfavorable development in the professional liability and non-proportional reinsurance assumed liability lines of business. The favorable excess workers’ compensation development was spread across most prior accident years, including 2012 and prior years, and was driven by a review of the Company’s claim reporting patterns as well as a number of favorable claim settlements relative to expectations. The unfavorable professional liability and non-proportional reinsurance assumed liability development was concentrated mainly in accident years 2016 through 2018 and was associated primarily with our U.S. assumed reinsurance business and related to accounts insuring construction projects and professional liability exposures.
Favorable prior year development (net of additional and return premiums) was $7 million in 2021.
Insurance – Reserves for the Insurance segment developed favorably by $20 million in 2021 (net of additional and return premiums). The overall favorable development in 2021 was attributable to favorable development on the 2020 accident year, partially offset by adverse development on the 2016 through 2019 accident years.
The favorable development on the 2020 accident year was largely concentrated in the commercial auto liability and other liability lines of business, including commercial multi-peril liability. During 2020 the Company achieved larger rate increases in these lines of business than were contemplated in its budget and in its initial loss ratio selections. The Company also experienced significantly lower reported claim frequency in these lines in 2020 relative to historical averages, and lower reported incurred losses relative to its expectations. We believe that the lower claim frequency and lower reported incurred losses were caused by the impacts of the COVID-19 pandemic, for example, lockdowns, reduced driving and traffic, work from home, and court closures. However, due to the uncertainty regarding the ultimate impacts of the pandemic on accident year 2020 incurred losses, the Company elected not to react to these lower reported trends during 2020. As more information became available and the 2020 accident year continued to mature, during 2021 the Company started to recognize favorable accident year 2020 development in response to the continuing favorable reported loss experience relative to its expectations.
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The adverse development on the 2016 through 2019 accident years is concentrated largely in the other liability line of business, including commercial multi-peril liability, but is also seen to a lesser extent in commercial auto liability. The adverse development for these accident years is driven by a higher than expected number of large losses reported, and particularly impacted the directors and officers liability, lawyers professional liability, and excess and surplus lines casualty classes of business. We also believe that increased social inflation is contributing to the increased number of large losses, for example, higher jury awards on cases which go to trial, and the corresponding higher demands from plaintiffs and higher values required to reach settlement on cases which do not go to trial.
Reinsurance & Monoline Excess – Reserves for the Reinsurance & Monoline Excess segment developed unfavorably by $13 million in 2021. The unfavorable development in the segment was driven by the non-proportional reinsurance assumed liability and other liability lines of business, related primarily to accident years 2017 through 2019, and was partially offset by favorable development in excess workers’ compensation business which was spread across many prior accident years. The unfavorable non-proportional reinsurance assumed liability and other liability development was associated with our U.S. and U.K. assumed reinsurance business, and related primarily to accounts insuring construction projects and professional liability exposures.

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Favorable prior year development (net of additional and return premiums) was $16 million in 2020.
Insurance - Reserves for the Insurance segment developed favorably by $24 million in 2020 (net of additional and return premiums). Continuing the pattern seen in recent years, the overall favorable development in 2020 resulted from more significant favorable development on workers’ compensation business, which was partially offset by unfavorable development on professional liability, including excess professional liability
For workers’ compensation, the favorable development was spread across almost all prior accident years, including prior to 2011, but was most significant in accident years 2016 through 2019. The favorable workers’ compensation development reflects a continuation of the benign loss cost trends experienced during recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure). The long term trend of declining workers’ compensation frequency can be attributable to improved workplace safety. Loss severity trends were also aided by our continued investment in claims handling initiatives such as medical case management services and vendor savings through usage of preferred provider networks and pharmacy benefit managers. Reported workers’ compensation losses in 2020 continued to be below our expectations at most of our businesses, and were below the assumptions underlying our initial loss ratio picks and our previous reserve estimates for most prior accident years.
For professional liability business, unfavorable development was driven mainly by large losses reported in the directors and officers (“D&O”), lawyers professional and excess hospital professional liability lines of business. For these lines of business, we continue to see an increase in the number of large losses reported and a lengthening of the reporting “tail” beyond historical levels. We believe a contributing cause is rising social inflation in the form of, for example, higher jury awards on cases that go to trial, and the corresponding higher demands from plaintiffs and higher values required to reach settlement on cases that do not go to trial. The unfavorable development for professional liability affected mainly accident years 2016 through 2018.
Reinsurance & Monoline Excess – Reserves for the Reinsurance & Monoline Excess segment developed unfavorably by $8 million in 2020. The unfavorable development in the segment was driven by non-proportional assumed liability business written in both the U.S. and U.K., and was partially offset by favorable development on excess workers’ compensation business. The unfavorable non-proportional assumed liability development was concentrated in accident years 2014 through 2018, and related primarily to accounts insuring construction projects and professional liability exposures.
Reserve Discount. The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,267$1,352 million and $1,387$1,464 million at December 31, 20222023 and 2021,2022, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $416$390 million and $452$416 million at December 31, 20222023 and 2021,2022, respectively. At December 31, 2022,2023, discount rates by year ranged from 0.7% to 6.5%, with a weighted average discount rate of 3.4%.
Substantially all discounted workers’ compensation reserves (97% of total discounted reserves at December 31, 2022)2023) are excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.
The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at December 31, 2022)2023), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates prescribed or permitted by the Department of Insurance of the State of Delaware.
Assumed Reinsurance Premiums. The Company estimates the amount of assumed reinsurance premiums that it will receive under treaty reinsurance agreements at the inception of the contracts. These premium estimates are revised as the actual amount of assumed premiums is reported to the Company by the ceding companies. As estimates of assumed premiums are made or revised, the related amount of earned premiums, commissions and incurred losses associated with those premiums are recorded. Estimated assumed premiums receivable were approximately $65 million and $60 million at both December 31, 2023 and 2022, and 2021.respectively. The assumed premium estimates are based upon terms set forth in reinsurance agreements, information received from ceding companies during the underwriting and negotiation of agreements, reports received from ceding companies and discussions and correspondence with reinsurance intermediaries. The Company also considers its own view of market conditions, economic trends and experience with similar lines of business. These premium estimates represent management’s best estimate of the ultimate amount of premiums to be received under its assumed reinsurance agreements.
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Allowance for Expected Credit Losses on Investments.
Fixed Maturity Securities – For fixed maturity securities in an unrealized loss position where the Company intends to sell, or it is more likely than not that it will be required to sell the security before recovery in value, the amortized cost basis is written down to fair value through net investment gains (losses). For fixed maturity securities in an unrealized loss position where the Company does not intend to sell, or it is more likely than not that it will not be required to sell the security before recovery in value, the Company evaluates whether the decline in fair value has resulted from credit losses or all other factors (non-credit factors). In making this assessment, the Company considers the extent to which fair value is less than amortized cost, changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, an allowance for expected credit losses is recorded for the credit loss through net investment gains (losses), limited by the amount that the fair value is less than the amortized cost basis. Effective January 1, 2020, theThe allowance is adjusted for any change in expected credit losses and subsequent recoveries through net investment gains (losses). The
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impairment related to non-credit factors is recognized in other comprehensive income (loss).
    The Company’s credit assessment of allowance for expected credit losses uses a third party model for available for sale and held to maturity securities, as well as loans receivable. The allowance for expected credit losses is generally based on the performance of the underlying collateral under various economic and default scenarios that involve subjective judgments and estimates by management. Modeling these securities involves various factors, such as projected default rates, the nature and realizable value of the collateral, if any, the ability of the issuer to make scheduled payments, historical performance and other relevant economic and performance factors. A discounted cash flow analysis is used to ascertain the amount of the allowance for expected credit losses, if any. In general, the model reverts to the rating-level long-term average marginal default rates based on 10 years of historical data, beyond the forecast period. For other inputs, the model in most cases reverts to the baseline long-term assumptions linearly over 5 years beyond the forecast period. The long-term assumptions are based on the historical averages.
    The Company classifies its fixed maturity securities by credit rating, primarily based on ratings assigned by credit rating agencies. For purposes of classifying securities with different ratings, the Company uses the average of the credit ratings assigned, unless in limited situations the Company’s own analysis indicates an internal rating is more appropriate. Securities that are not rated by a rating agency are evaluated and classified by the Company on a case-by-case basis.
A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at December 31, 20222023 is presented in the table below.
 
($ in thousands)($ in thousands)Number of
Securities		Aggregate
Fair Value		Unrealized
Loss		($ in thousands)Number of
Securities		Aggregate
Fair Value		Unrealized
Loss
Foreign governmentForeign government36 $119,332 $73,900 
State and municipal
CorporateCorporate10 39,347 4,649 
State and municipal1 12,247 2,756 
Mortgage-backed securitiesMortgage-backed securities14 4,464 269 
Asset-backed securitiesAsset-backed securities1 16 10 
TotalTotal62 $175,406 $81,584 
As of December 31, 2022,2023, the Company has recorded an allowance for expected credit losses on fixed maturity securities of $37 million. The Company has evaluated the remaining fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due.
Loans Receivable – For loans receivable, the Company estimates an allowance for expected credit losses based on relevant information about past events, including historical loss experience, current conditions and forecasts that affect the expected collectability of the amortized cost of the financial asset. The allowance for expected credit losses is presented as a reduction to amortized cost of the financial asset in the consolidated balance sheet and changes to the estimate for expected credit losses are recognized through net investment gains (losses). Loans receivable are reported net of an allowance for expected credit losses of $3 million and $2 million as of both December 31, 2023 and 2022, and 2021.respectively.
Fair Value Measurements. The Company’s fixed maturity available for sale securities, equity securities, and its trading account securities are carried at fair value. Fair value is defined as "the price that would be received to sell an asset or
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paid to transfer a liability in an orderly transaction between market participants at the measurement date". The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for similar assets in active markets. Level 3 inputs are unobservable inputs for the asset or liability. Unobservable inputs may only be used to measure fair value to the extent that observable inputs are not available. The fair value of the vast majority of the Company’s portfolio is based on observable data (other than quoted prices) and, accordingly, is classified as Level 2.
In classifying particular financial securities in the fair value hierarchy, the Company uses its judgment to determine whether the market for a security is active and whether significant pricing inputs are observable. The Company determines the existence of an active market by assessing whether transactions occur with sufficient frequency and volume to provide reliable pricing information. The Company determines whether inputs are observable based on the use of such information by pricing services and external investment managers, the uninterrupted availability of such inputs, the need to make significant
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adjustments to such inputs and the volatility of such inputs over time. If the market for a security is determined to be inactive or if significant inputs used to price a security are determined to be unobservable, the security is categorized in Level 3 of the fair value hierarchy.
Because many fixed maturity securities do not trade on a daily basis, the Company utilizes pricing models and processes which may include benchmark curves, benchmarking of like securities, sector groupings and matrix pricing. Market inputs used to evaluate securities include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data. Quoted prices are often unavailable for recently issued securities that are infrequently traded or securities that are only traded in private transactions. For publicly traded securities for which quoted prices are unavailable, the Company determines fair value based on independent broker quotations and other observable market data. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial data, projections and business developments of the issuer and other relevant information.
The following is a summary of pricing sources for the Company's fixed maturity securities available for sale as of December 31, 2022:2023:
(In thousands)(In thousands)Carrying
Value		Percent
of Total		(In thousands)Carrying
Value		Percent
of Total
Pricing source:Pricing source:
Independent pricing servicesIndependent pricing services$17,025,723 97.1 %
Independent pricing services
Independent pricing services$19,589,441 97.3 %
Syndicate managerSyndicate manager62,966 0.4 
Directly by the Company based on:Directly by the Company based on:
Observable dataObservable data447,364 2.5 
Observable data
Observable data
TotalTotal$17,536,053 100.0 %
Total
Total$20,124,936 100.0 %
Independent pricing services - Substantially all of the Company’s fixed maturity securities available for sale were priced by independent pricing services (generally one U.S. pricing service plus additional pricing services with respect to a limited number of foreign securities held by the Company). The prices provided by the independent pricing services are generally based on observable market data in active markets (e.g., broker quotes and prices observed for comparable securities). The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness based upon current trading levels for similar securities. If the prices appear unusual to the Company, they are re-examined and the value is either confirmed or revised. In addition, the Company periodically performs independent price tests of a sample of securities to ensure proper valuation and to verify our understanding of how securities are priced. As of December 31, 2022,2023, the Company did not make any adjustments to the prices provided by the pricing services. Based upon the Company’s review of the methodologies used by the independent pricing services, these securities were classified as Level 2.
Syndicate manager – The Company has a 15% participation in a Lloyd’s syndicate, and the Company’s share of the securities owned by the syndicate is priced by the syndicate’s manager. The majority of the securities are liquid, short duration fixed maturity securities. The Company reviews the syndicate manager’s pricing methodology and audited financial statements and holds discussions with the syndicate manager as necessary to confirm its understanding and agreement with security prices. Based upon the Company’s review of the methodologies used by the syndicate manager, these securities were classified as Level 2.
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Observable data – If independent pricing is not available, the Company prices the securities directly. Prices are based on observable market data where available, including current trading levels for similar securities and non-binding quotations from brokers. The Company generally requests two or more quotes. If more than one quote is received, the Company sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes obtained from brokers. Since these securities were priced based on observable data, they were classified as Level 2.
Cash flow model – If the above methodologies are not available, the Company prices securities using a discounted cash flow model based upon assumptions as to prevailing credit spreads, interest rates and interest rate volatility, time to maturity and subordination levels. Discount rates are adjusted to reflect illiquidity where appropriate. These securities were classified as Level 3.

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Results of Operations for the Years Ended December 31, 20222023 and 20212022
Business Segment Results
Following is a summary of gross and net premiums written, net premiums earned, loss ratios (losses and loss expenses incurred expressed as a percentage of net premiums earned), expense ratios (underwriting expenses expressed as a percentage of net premiums earned) and GAAP combined ratios (sum of loss ratio and expense ratio) for each of our business segments for the years ended December 31, 20222023 and 2021.2022. The GAAP combined ratio represents a measure of underwriting profitability, excluding investment income. A GAAP combined ratio in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit. 
(In thousands)(In thousands)20222021(In thousands)20232022
InsuranceInsurance
Gross premiums written
Gross premiums written
Gross premiums writtenGross premiums written$10,583,785 $9,471,667 
Net premiums writtenNet premiums written8,784,146 7,743,814 
Net premiums earnedNet premiums earned8,369,062 7,077,708 
Loss ratioLoss ratio61.3 %61.1 %Loss ratio62.3 %61.3 %
Expense ratioExpense ratio27.9 28.3 
GAAP combined ratioGAAP combined ratio89.2 89.4 
Reinsurance & Monoline ExcessReinsurance & Monoline Excess
Gross premiums writtenGross premiums written$1,325,267 $1,228,467 
Gross premiums written
Gross premiums written
Net premiums writtenNet premiums written1,219,924 1,119,053 
Net premiums earnedNet premiums earned1,192,367 1,028,323 
Loss ratioLoss ratio61.3 %61.0 %Loss ratio53.8 %61.3 %
Expense ratioExpense ratio28.4 29.7 
GAAP combined ratioGAAP combined ratio89.7 90.7 
ConsolidatedConsolidated
Gross premiums writtenGross premiums written$11,909,052 $10,700,134 
Gross premiums written
Gross premiums written
Net premiums writtenNet premiums written10,004,070 8,862,867 
Net premiums earnedNet premiums earned9,561,429 8,106,031 
Loss ratioLoss ratio61.3 %61.1 %Loss ratio61.3 %61.3 %
Expense ratioExpense ratio28.0 28.5 
GAAP combined ratioGAAP combined ratio89.3 89.6 

Net Income to Common Stockholders. The following table presents the Company’s net income to common stockholders and net income per diluted share for the years ended December 31, 20222023 and 2021.2022.
(In thousands, except per share data)(In thousands, except per share data)20222021(In thousands, except per share data)20232022
Net income to common stockholdersNet income to common stockholders$1,381,062 $1,022,490 
Weighted average diluted sharesWeighted average diluted shares279,461 279,749 
Net income per diluted shareNet income per diluted share$4.94 $3.66 
The Company reported net income of $1,381 million in 2022 compared to $1,022 million in 2021.both 2023 and 2022. The $359 million increase in2023 net income was primarily due to an after-tax increase in underwriting income of $145 million mainly due to the growth in premium rates and exposure as well as reductions in expense ratio driven by net earned premium growth outpacing expense growth, an after-tax increase in net investment gains of $90 million primarily due to the sale of a real estate investment in London as well as change in market value of equity securities,reflected an after-tax increase in net investment income of $87$216 million primarily due to rising interest rates and a larger investment portfolio related to fixed maturity securities, an after-tax increase in foreign currency gainsunderwriting income of $20$38 million mainly due to the growth in premium rates, an after-tax reduction in interest expenses of $14$2 million due to debt repayment and refinancings, an after-tax reduction on debt extinguishment expense of $9 million for debt redeemed in 2021,2022, an after-tax increase in profit from insurance service businesses of $5$1 million and an after-tax increase of $5$1 million in minority interest, andoffset by an after-tax reduction in net investment gains of $123 million mainly due to the gain on sale of a reductionreal estate investment in 2022, an after-tax increase in foreign currency losses of $2$65 million mainly due to weakening of the U.S. dollar against other currencies in 2023, an after-tax increase in corporate expenses of $37 million due to increased compensation-related costs, an increase of $28 million in tax expense due to a change in the effective tax rate partially offset by an after-tax increase in corporate expenses of $17 million mainly due to performance-based compensation costs and an after-tax decrease in profits from non-insurance businesses of $1$5 million. The number of weighted average diluted shares decreased by 0.36.2 million for 20222023 compared to 20212022, mainly reflecting shares repurchased in 2021 and 2022.2023.
Premiums. Gross premiums written were $12,972 million in 2023, an increase of 9% from $11,909 million in 2022, an increase of 11% from $10,700 million in 2021.2022. The increase was due to the growth in the Insurance segment of $1,112$977 million and $97$86 million in the Reinsurance & Monoline Excess segment. Approximately 81% and 82% of premiums expiring were renewed in 2023 and 2022, respectively.
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Excess segment. Approximately 82% of premiums expiring were renewed in both 2022 and 2021.
Average renewal premium rates for insurance and facultative reinsurance increased 7.1% in 2023 and 6.4% in 2022, and 9.1% in 2021, when adjusted for changes in exposures. Average renewal premium rates for insurance and facultative reinsurance excluding workers' compensation increased 8.1% in 2023 and 7.5% in 2022, and 10.4% in 2021, when adjusted for changes in exposures.
A summary of gross premiums written in 20222023 compared with 20212022 by line of business within each business segment follows:
•Insurance gross premiums increased 12%9% to $11,561 million in 2023 from $10,584 million in 2022 from $9,472 million in 2021.2022. Gross premiums increased $539$516 million (16%(13%) for other liability, $354$454 million (17%(19%) for short-tail lines, $143$141 million (12%(11%) for commercial auto $70and $10 million (6%(1%) for workers' compensation, and $6partially offset by a reduction of $144 million (0.4%(9%) for professional liability.
•Reinsurance & Monoline Excess gross premiums increased 8%6% to $1,411 million in 2023 from $1,325 million in 2022 from $1,228 million in 2021.2022. Gross premiums written increased $58$79 million (8%) for casualty lines, $28 million (12%(30%) for property lines and $11$28 million (5%(12%) for monoline excess.excess, partially offset by a reduction of $22 million (3%) for casualty lines.
Net premiums written were $10,954 million in 2023, an increase of 10% from $10,004 million in 2022, an increase of 13% from $8,863 million in 2021.2022. Ceded reinsurance premiums as a percentage of gross written premiums were 16% in 2022both 2023 and 17% in 2021.2022.
Premiums earned increased 18%9% to $10,401 million in 2023 from $9,561 million in 2022 from $8,106 million in 2021.2022. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly recent rate increases will be earned over the upcoming quarters. Premiums earned in 20222023 are related to business written during both 20222023 and 2021.2022. Audit premiums were $363 million in 2023 compared with $312 million in 2022 compared with $195 million in 2021.2022.
Net Investment Income. Following is a summary of net investment income (loss) for the years ended December 31, 20222023 and 2021:2022:
AmountAverage Annualized
Yield
AmountAmountAverage Annualized
Yield
(In thousands)(In thousands)2022202120222021(In thousands)2023202220232022
Fixed maturity securities, including cash and cash equivalents and loans receivableFixed maturity securities, including cash and cash equivalents and loans receivable$549,281 $382,001 2.9 %2.2 %Fixed maturity securities, including cash and cash equivalents and loans receivable$929,098 $$549,281 4.4 4.4 %2.9 %
Arbitrage trading account
Equity securities
Investment fundsInvestment funds145,099 220,014 8.9 15.8 
Equity securities52,600 32,020 4.9 5.0 
Arbitrage trading account45,213 37,676 4.0 5.3 
Real estateReal estate(3,087)7,703 (0.2)0.4 
Gross investment incomeGross investment income789,106 679,414 3.2 3.1 
Investment expensesInvestment expenses(9,921)(7,796)— — 
TotalTotal$779,185 $671,618 3.2 %3.0 %Total$1,052,835 $$779,185 4.0 4.0 %3.2 %
Net investment income increased 16%35% to $1,053 million in 2023 from $779 million in 2022 from $672 million in 2021 due primarily to an $167a $380 million increase in income from fixed maturity securities mainly driven by risinghigher interest rates and a larger investment portfolio, a $21$24 million increase from the arbitrage trading account (including investment income from trading account receivables from brokers and clearing organizations), a $3 million increase from equity securities and a $7$3 million increase from the arbitrage trading account,reduction in investment expenses, partially offset by a $75$128 million decrease in income from investment funds primarily due to financial service funds and real estate funds and an $11$8 million decrease in real estate and a $2 million increase in investment expenses.estate. Investment funds are reported on a one quarter lag. The average annualized yield for fixed maturity securities was 4.4% in 2023 and 2.9% in 2022 and 2.2% in 2021.2022. The effective duration of the fixed maturity portfolio was 2.4 years at both December 31, 20222023 and 2021.2022. The Company maintained the shortened duration of its fixed maturity security portfolio, thereby reducing the potential impact of mark-to-market on the portfolio and positioning the Company to react quickly to changes in the current interest rate environment. Average invested assets, at cost (including cash and cash equivalents), were $26.4 billion in 2023 and $24.4 billion in 2022 and $22.2 billion in 2021.2022.
Insurance Service Fees. The Company earns fees from an insurance distribution business (part of which was sold in June 2023), a third-party administrator, and as a servicing carrier of workers' compensation assigned risk plans for certain states. Insurance service fees increased towere $106 million in 2023 and $111 million in 20222022. The decrease in service fees resulted from $94 million in 2021 due to organic growth within
the business.sale of the property and casualty insurance services division of Breckenridge IS, Inc.
Net Realized and Unrealized Gains on Investments. The Company buys and sells securities and other investment assets on a regular basis in order to maximize its total return on investments. Decisions to sell securities and other investment assets are based on management’s view of the underlying fundamentals of specific investments as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Net realized and unrealized gains on investments were $48 million in 2023 compared with $217 million in 2022 compared with $1072022. In 2023, the gains reflected a change in unrealized
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gains on equity securities of $70 million, in 2021.partially offset by net realized losses on investments of $23 million. In 2022, the gains reflected net realized gains on investments of $218 million (primarily due to a $251 million net gain from the sale of a real estate investment in London after
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transaction expenses and the foreign currency impact including reversal of the currency translation adjustment), partially offset by a change in unrealized losses on equity securities of $1 million. In 2021, the gains reflected net realized gains on investments of $145 million (primarily due to the sale of certain real estate assets and the disposition of an investment fund), partially offset by an increase in unrealized losses on equity securities of $38 million.
Change in Allowance for Expected Credit Losses on Investments. Based on credit factors, the allowance for expected credit losses is increased or decreased depending on the percentage of unrealized loss relative to amortized cost by security, changes in rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. ForIn 2023, the year ended December 31,pre-tax change in allowance for expected credit losses on investments increased by $498 thousand ($393 thousand after-tax), which is reflected in net investment gains. In 2022, the pre-tax change in allowance for expected credit losses on investments increased by $15 million ($12 million after-tax), which is reflected in net investment gains, primarily due to change in estimate. For the year ended December 31, 2021, the pre-tax change in allowance for expected credit losses on investments increased by $16 million ($13 million after-tax), which is reflected in net investment gains, primarily related to foreign government securities which did not previously have an allowance.
Revenues from Non-Insurance Businesses. Revenues from non-insurance businesses were derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aviation-related businesses that provide services to aviation markets, including (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenues from non-insurance businesses were $536 million in 2023 and $510 million in 2022 and $489 million in 2021.2022. The increase mainly relates to theaviation-related business recovery from COVID-19 on promotional merchandise and textile business as well as a newly acquiredthe commercial and residential textile business, which we acquired in 2022, partially offset by athe decrease for the aviation-relatedof promotional merchandise and existing textile business.
Losses and Loss Expenses. Losses and loss expenses increased to $6,372 million in 2023 from $5,862 million in 2022 from $4,954 million in 2021.2022. The consolidated loss ratio was 61.3% in 2022both 2023 and 61.1% in 2021.2022. Catastrophe losses, net of reinsurance recoveries, were $212$195 million (including current accident year losses of approximately $1 million related to COVID-19) in 2023 compared with $212 million (including losses of approximately $5 million related to COVID-19) in 2022 compared with $202 million in 2021 (including losses of approximately $58 million related to COVID-19).2022. Adverse prior year reserve development (net of premium offsets) was $19 million in 2023 and $36 million in 2022 and favorable prior year reserve development was $7 million in 2021 (refer to Note 1413 of our consolidated financial statements for more detail). The loss ratio excluding catastrophe losses and prior year reserve development was 59.2% and 58.7% in both2023 and 2022, and 2021.respectively.
A summary of loss ratios in 20222023 compared with 20212022 by business segment follows:
•Insurance - The loss ratio ofwas 62.3% in 2023 and 61.3% in 2022 was 0.2 points higher than the loss ratio of 61.1% in 2021.2022. Catastrophe losses were $160 million in 2023 compared with $127 million in 2022 compared with $150 million in 2021. The Company reflected a best estimate (net of reinsurance) based upon available information for current accident year COVID-19-related losses of approximately $3 million.2022. Adverse prior year reserve development was $24 million in 2023, principally from property catastrophe losses, and $40 million in 2022, driven by two businesses that wrote policies providing coverage for event cancellation, and film production delay which were heavily impacted by losses directly caused by the COVID-19 pandemic and favorable prior year reserve development was $20 million in 2021.2022. The loss ratio excluding catastrophe losses and prior year reserve development wasincreased 1.0 points to 60.3% in 2023 from 59.3% in both 2022 and 2021.2022.
•Reinsurance & Monoline Excess - The loss ratio ofwas 53.8% in 2023 and 61.3% in 2022 was 0.3 points higher than the loss ratio of 61.0% in 2021.2022. Catastrophe losses were $35 million in 2023 compared with $85 million in 2022 compared with $52 million in 2021.The Company reflected a best estimate (net of reinsurance) based upon available information for current accident year COVID-19-related losses of approximately $2 million.2022. Favorable prior year reserve development was $5 million in 2023 and $4 million in 2022, and adverse prior year reserve development was $13 million in 2021.2022. The loss ratio excluding catastrophe losses and prior year reserve development decreased 0.23.1 points to 51.4% in 2023 from 54.5% in 2022 from 54.7% in 2021.2022.
Other Operating Costs and Expenses. Following is a summary of other operating costs and expenses:
(In thousands)20222021
Policy acquisition and insurance operating expenses$2,673,903 $2,306,727 
Insurance service expenses96,419 86,003 
Net foreign currency gains(50,930)(25,725)
Debt extinguishment costs— 11,521 
Other costs and expenses242,113 220,744 
Total$2,961,505 $2,599,270 
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(In thousands)20232022
Policy acquisition and insurance operating expenses$2,954,686 $2,673,903 
Insurance service expenses91,714 96,419 
Net foreign currency losses (gains)31,799 (50,930)
Other costs and expenses285,737 242,113 
Total$3,363,936 $2,961,505 
Policy acquisition and insurance operating expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Policy acquisition and insurance operating expenses increased 16% from 2021, while11% and net premiums earned increased 18% over that period.9% from 2022. The expense ratio (underwriting expenses expressed as a percentage of net premiums earned) wasincreased by 0.4 points to 28.4% in 2023 from 28.0% in 2022 down from 28.5% in 2021. The improvement is primarily attributablemainly due to higher net premiums earned outpacinglower ceding
commissions, increased compensation expense growth. However, to the extent our net premiums earned decrease or travelcosts and entertainment expenses increase, our expense ratio would be expected to increase.new start-up operating unit expenses.
Service expenses, which represent the costs associated with the fee-based businesses, was $92 million in 2023, down from $96 million in 2022, as a result of the sale of the property and $86 million in 2021 due to the organic growth within the business.casualty insurance services division of Breckenridge IS, Inc.
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Net foreign currency gainslosses (gains) result from transactions denominated in a currency other than a businesses’ functional currency. Net foreign currency losses were $32 million in 2023 compared to gains wasof $51 million in 2022, and $26 million in 2021, mainlyprimarily related to the strengthening of the U.K. sterling and Euro against the U.S. dollar compared to the majority of other currencies.
Debt extinguishment costs of $12 million in 2021 related to the redemption of $400 million of subordinated debentures in March and June 2021 that were due in 2056.2023.
Other costs and expenses represent general and administrative expenses of the parent company and other expenses not allocated to business segments, including the cost of certain long-term incentive plans and new business ventures. Other costs and expenses increased to $286 million in 2023 from $242 million in 2022, from $221 million in 2021, primarily due to the increase in performance-based compensationcompensation-related costs in 2022.2023.
Expenses from Non-Insurance Businesses. Expenses from non-insurance businesses represent costs associated with businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aviation-related businesses that include (i) cost of goods sold related to aircraft and products sold and services provided and (ii) general and administrative expenses. Expenses from non-insurance businesses were $525 million in 2023 compared to $493 million in 2022 compared to $472 million in 2021.2022. The increase mainly relates to the aviation-related business recovery from COVID-19 on promotional merchandise and textile business as well as a newly acquiredthe residential and commercial textile business, which we acquired in 2022, partially offset by athe decrease for the aviation-relatedof promotional merchandise and existing textile business.
Interest Expense. Interest expense was $127 million in 2023, down from $130 million in 2022, and $147 million in 2021. In March 2021,primarily due to the Company issued $400 million aggregate principal amount of 3.55% senior notes due 2052 and redeemed its $110 million aggregate principal amount of 5.90% subordinated debentures due 2056. In June 2021, the Company redeemed the $290 million aggregate principal amount of its 5.75% subordinated debentures due 2056. In September 2021, the Company issued $350 million aggregate principal amount of 3.15% senior notes due 2061.
In the first quarter of 2022, the Company repaidrepayment at maturity of its $77 million aggregate principal amount of 8.7% senior notes in January and its $350 million aggregate principal amount of 4.625% senior notes in March. The above redemptions during the year ended December 31, 2021 resulted in debt extinguishment costs of $12 million. Additionally, in the secondfirst quarter of 2021, the Company sold a real estate asset, which resulted in a $102 million reduction of the Company's non-recourse debt that was supporting the property.
The repayment at maturity and redemption of senior notes and debentures and issuance of additional senior notes and debentures in 2022 and 2021 decreased interest expense in 2022.
Income Taxes. The effective income tax rate was 21.1% in 2023 and 19.5% in 2022 and 19.6% in 2021.2022. The lowerhigher effective income tax rate for the year, as compared to 2022, was primarily due to a net reduction into the Company’s valuation allowance against foreign tax credits and foreign net operating losses. The effective income tax rate reflects tax benefits attributable to tax-exempt investment income and equity-based compensationlosses in both periods.the earlier period. See Note 1716 of the Consolidated Financial Statements for a reconciliation of the income tax expense and the amounts computed by applying the Federal income tax rate of 21%.
The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $169$261 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. In the future, if such earnings were distributed the Company projects that the incremental tax, if any, will be immaterial.
On August 16, 2022, the Inflation Reduction Act of 2022 was enacted. Among other things, the legislation introduced a corporate alternative minimum tax on certain corporations. The tax is applicable for taxable years beginning after December 31, 2022 and imposes a 15% minimum tax on a corporation’s applicable financial statement income. WeWhile we are continuingnot subject to this tax in 2023, we continue to evaluate the overall impact of this tax legislation on our operations and U.S. federal income tax position. In addition, a 1% excise tax on the value of corporate share repurchases (net of issuance) went into effect on January 1, 2023, but was not material for 2023.
Further, the Company is monitoring the impact of the implementation of a global minimum tax rate of 15%, also known as Pillar Two, as introduced by the Organization for Economic Co-operation and Development, which applies in some countries commencing in 2024. Our initial assessment is that the impact will not be significant, as the Company mainly operates in jurisdictions with a statutory tax rate above 15%.
The “Bermuda Corporate Income Tax Act 2023” was passed into law December 27, 2023 in Bermuda. The income tax will be based on a statutory tax rate of 15% on Bermuda businesses, subject to reductions for foreign tax credits, and will be effective for fiscal years beginning on or after January 1, 2025. Although we do not currently believe that this will have a material impact on our income tax position, atwe will continue to evaluate this time.tax legislation in 2024.

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Results of Operations for the Years Ended December 31, 20212022 and 20202021
For a comparison of the Company’s results of operations for the year ended December 31, 20212022 to the year ended December 31, 2020,2021, see Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021,2022, which was filed with the Securities and Exchange Commission on February 24, 2022.2023.
5355


Investments
As part of its investment strategy, the Company establishes a level of cash and highly liquid short-term and intermediate-term securities that, combined with expected cash flow, it believes is adequate to meet its payment obligations. In addition to fixed-maturityfixed maturity securities, the Company invests in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets. The Company's investments in investment funds and its other alternative investments have experienced, and the Company expects to continue to experience, greater fluctuations in investment income.
The Company also attempts to maintain an appropriate relationship between the effective duration of the investment portfolio and the approximate duration of its liabilities (i.e., policy claims and debt obligations). The effective duration of the investment portfolio was 2.4 years at both December 31, 20222023 and 2021, respectively.2022. The Company’s investment portfolio and investment-related assets as of December 31, 20222023 were as follows:
($ in thousands)($ in thousands)Carrying
Value		Percent
of Total		($ in thousands)Carrying
Value		Percent
of Total
Fixed maturity securities:Fixed maturity securities:
U.S. government and government agenciesU.S. government and government agencies$892,258 3.7 %
U.S. government and government agencies
U.S. government and government agencies$1,716,731 6.4 %
State and municipal:State and municipal:
Special revenueSpecial revenue1,721,497 7.1 
Special revenue
Special revenue
State general obligation
Local general obligationLocal general obligation441,097 1.8 
State general obligation416,713 1.7 
Corporate backedCorporate backed199,639 0.8 
Pre-refunded (1)Pre-refunded (1)158,840 0.6 
Total state and municipalTotal state and municipal2,937,786 12.0 
Mortgage-backed securities:Mortgage-backed securities:
Agency
Agency
AgencyAgency901,332 3.7 
CommercialCommercial528,609 2.2 
Residential-PrimeResidential-Prime235,315 1.0 
Residential-Alt AResidential-Alt A3,762 — 
Total mortgage-backed securitiesTotal mortgage-backed securities1,669,018 6.9 
Asset-backed securitiesAsset-backed securities3,982,773 16.4 
Corporate:Corporate:
Industrial
Industrial
IndustrialIndustrial3,252,999 13.4 
FinancialFinancial2,470,372 10.2 
UtilitiesUtilities551,048 2.3 
OtherOther429,573 1.7 
Total corporateTotal corporate6,703,992 27.6 
Foreign governmentForeign government1,401,522 5.8 
Total fixed maturity securitiesTotal fixed maturity securities17,587,349 72.4 
Equity securities available for sale:Equity securities available for sale:
Common stocksCommon stocks982,751 4.0 
Common stocks
Common stocks
Preferred stocksPreferred stocks203,143 0.8 
Total equity securities available for saleTotal equity securities available for sale1,185,894 4.8 
Investment fundsInvestment funds1,608,548 6.6 
Cash and cash equivalentsCash and cash equivalents1,449,346 6.0 
Real estateReal estate1,340,622 5.5 
Arbitrage trading accountArbitrage trading account944,230 3.9 
Loans receivableLoans receivable193,002 0.8 
Total investmentsTotal investments$24,308,991 100.0 %Total investments$26,642,699 100.0 100.0 %
______________
(1)Pre-refunded securities are securities for which an escrow account has been established to fund the remaining payments of principal and interest through maturity. Such escrow accounts are funded almost exclusively with U.S. Treasury and U.S. government agency securities.
Fixed Maturity Securities. The Company’s investment policy with respect to fixed maturity securities is generally to purchase instruments with the expectation of holding them to their maturity. However, management of the available for sale
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portfolio is considered necessary to maintain an approximate matching of assets and liabilities as well as to adjust the portfolio as a result of changes in financial market conditions and tax considerations.
The Company’s philosophy related to holding or selling fixed maturity securities is based on its objective of maximizing total return. The key factors that management considers in its investment decisions as to whether to hold or sell fixed maturity securities are its view of the underlying fundamentals of specific securities as well as its expectations regarding interest rates, credit spreads and currency values. In a period in which management expects interest rates to rise, the Company may sell longer duration securities in order to mitigate the impact of an interest rate rise on the fair value of the portfolio. Similarly, in a period in which management expects credit spreads to widen, the Company may sell lower quality securities, and in a period in which management expects certain foreign currencies to decline in value, the Company may sell securities denominated in those foreign currencies. The sale of fixed maturity securities in order to achieve the objective of maximizing total return may result in realized gains; however, there is no reason to expect these gains to continue in future periods.
Equity Securities. Equity securities primarily represent investments in common and preferred stocks in companies with potential growth opportunities in different sectors, mainly in the financial institutions and energy sectors.
Investment Funds. At December 31, 2022,2023, the carrying value of investment funds was $1,609$1,622 million, including investments in financial services funds of $466$433 million, other funds of $370$397 million (which includes a deferred compensation trust asset of $30$36 million), transportation funds of $337$344 million, real estate funds of $205$202 million, energyinfrastructure funds of $116$131 million and infrastructureenergy funds of $115 million. Investment funds are primarily reported on a one-quarter lag.
Real Estate. Real estate is directly owned property held for investment. At December 31, 2022,2023, real estate properties in operation included a long-term ground lease in Washington D.C., an office complex in New York City and the completed portion of a mixed-use project in Washington D.C. In addition, part of the previously mentioned mixed-use project in Washington D.C. is under development. The Company expects to fund further development costs for the project with a combination of its own funds and external financing. The Company recognized impairments on real estate of $72 million in 2023. During the first quarter of 2022, the Company sold an office building in London.
Arbitrage Trading Account. The arbitrage trading account is comprised of direct investments in arbitrage securities. Merger arbitrage is the business of investing in the securities of publicly held companies that are the targets in announced tender offers and mergers.
Loans Receivable. Loans receivable, net of allowance for expected credit losses, had an amortized cost of $193$201 million and an aggregate fair value of $188$198 million at December 31, 2022.2023. The amortized cost of loans receivable is net of an allowance for expected credit losses of $2$3 million as of December 31, 2022.2023. Loans receivable include real estate loans of $174$200 million that are secured by commercial and residential real estate located primarily in London and New York. Real estate loans generally earn interest at fixed or stepped interest rates and have maturities through 2026. Loans receivable include commercial loans of $19$1 million that are secured by business assets and have fixed interest rates with varying maturities not exceeding 10 years.
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Liquidity and Capital Resources
Cash Flow. Cash flow provided from operating activities increased to $2,929 million in 2023 from $2,569 million in 2022, from $2,184 million in 2021, primarily due to an increase in premium receipts partially offset by increased loss and loss expense payments.
The Company's insurance subsidiaries' principal sources of cash are premiums, investment income, service fees and proceeds from sales and maturities of portfolio investments. The principal uses of cash are payments for claims, taxes, operating expenses and dividends. The Company expects its insurance subsidiaries to fund the payment of losses with cash received from premiums, investment income and fees. The Company generally targets an average duration for its investment portfolio that is within 1.5 years of the average durationnumber of years held for its liabilities so that portions of its investment portfolio mature throughout the claim cycle and are available for the payment of claims if necessary. In the event operating cash flow and proceeds from maturities and prepayments of fixed maturity securities are not sufficient to fund claim payments and other cash requirements, the remainder of the Company's cash and investments is available to pay claims and other obligations as they become due. The Company's investment portfolio is highly liquid, with approximately 76%81% invested in cash, cash equivalents and marketable fixed maturity securities as of December 31, 2022.2023. If the sale of fixed maturity securities were to become necessary, a realized gain or loss equal to the difference between the cost and sales price of securities sold would be recognized.
Debt. At December 31, 2022,2023, the Company had senior notes, subordinated debentures and other debt outstanding with a carrying value of $2,837 million and a face amount of $2,862$2,865 million. In the first quarter of 2022, the Company repaid at maturity its $77 million aggregate principal amount of 8.7% senior notes in January and its $350 million aggregate principal amount of 4.625% senior notes in March. The maturities of the outstanding debt are $5$7 million in 2024, $2$3 million in 2025, $250 million in 2037, $350 million in 2044, $470 million in 2050, $400 million in 2052, $185 million in 2058, $300 million in 2059, $250 million in 2060, and $650 million in 2061.
On April 1, 2022, the Company entered into a senior unsecured revolving credit facility that provides for revolving, unsecured borrowings up to an aggregate of $300 million with a $50 million sublimit for letters of credit. The Company may increase the amount available under the facility to a maximum of $500 million subject to obtaining lender commitments for the increase and other customary conditions. Borrowings under the facility may be used for working capital and other general corporate purposes. All borrowings under the facility must be repaid by April 1, 2027, except that letters of credit outstanding on that date may remain outstanding until April 1, 2028 (or such later date approved by all lenders). Our ability to utilize the facility is conditioned on the satisfaction of representations, warranties and covenants that are customary for facilities of this type. As of December 31, 2022,2023, there were no borrowings outstanding under the facility.
Equity. At December 31, 2022,2023, total common stockholders’ equity was $6.7$7.5 billion, common shares outstanding were 264,546,100256,544,757 and stockholders’ equity per outstanding share was $25.51.$29.06. The Company repurchased 1,370,3948,707,676 and 1,752,6191,370,394 shares of its common stock in 20222023 and 2021,2022, respectively. The aggregate cost of the repurchases was $537 million in 2023 and $94 million in 2022 and $122 million in 2021.2022. In 2022,2023, the Board declared regular quarterly cash dividends of $0.09$0.10 per share in the first quarter and $0.10$0.11 per share in each of the remaining three quarters, as well as special dividends of $0.50 per share in the second quarter,first, third, and fourth quarters, for a total of $235$501 million in aggregate dividends in 2022.2023.
Total Capital. Total capitalization (equity, debt and subordinated debentures) was $9.6$10.3 billion at December 31, 2022.2023. The percentage of the Company’s capital attributable to senior notes, subordinated debentures and other debt was 30%28% and 33%30% at December 31, 20222023 and 2021,2022, respectively.

Federal and Foreign Income Taxes
The Company files a consolidated income tax return in the U.S. and foreign tax returns in each of the countries in which it has overseas operations. At December 31, 2022,2023, the Company had a gross deferred tax asset of $801$777 million (which primarily relates to, unrealized losses on investments, loss and loss expense reserves, and unearned premium reserves)reserves and unrealized losses on investments). The Company also has a $47$36 million valuation allowance against the gross deferred tax asset and a gross deferred tax liability of $425$473 million (which primarily relates to deferred policy acquisition costs, and various investment funds) resulting in a net deferred tax asset of $329$267 million. The realization of this asset is dependent upon the Company's ability to generate sufficient taxable income in future periods. Based on historical results and the prospects for future operations, management anticipates that it is more likely than not that future taxable income will be sufficient for the realization of this asset.
5658


Reinsurance
The Company follows customary industry practice of reinsuring a portion of its exposures in exchange for paying reinsurers a part of the premiums received on the policies it writes. Reinsurance is purchased by the Company principally to reduce its net liability on individual risks and to protect against catastrophic losses. Although reinsurance does not legally discharge an insurer from its primary liability for the full amount of the policies, it does make the assuming reinsurer liable to the insurer to the extent of the reinsurance coverage. The Company monitors the financial condition of its reinsurers and attempts to place its coverages only with financially sound carriers. Reinsurance coverage and retentions vary depending on the line of business, location of the risk and nature of loss. The Company’s reinsurance purchases include the following:
•Property reinsurance treaties - The Company purchases property reinsurance to reduce its exposure to large individual property losses and catastrophe events. Following is a summary of significant property reinsurance treaties in effect as of January 1, 2023: 2024:
◦The Company’s property per risk reinsurance generally covers losses between $2.5 million and $80$85 million.
◦The Company’s catastrophe excess of loss reinsurance program provides protection for net losses in excess of between $65 million and $80 million up to $500 million for the majority of U.S. business written by its Insurance segment businesses and U.S. and non-U.S. business written by Lloyd's Syndicate, excluding offshore energy; this includes some co-participation in lower layers.energy. For terrorism, we currently retain the first $95 million and then fully insure above this to our desired limit of $400 million. For 2023,2024, some of our property catcatastrophe reinsurance is placed via an industry loss warranty (ILW) covercovers and the equivalent W. R. Berkley limit and retention (and resulting net position) are estimated based on our market share and modeled outcome when applying the ILW layering. The Company’s catastrophe reinsurance agreementsRetentions by territory and peril range between $62.1 million and $83.6 million. Limits purchased are subject to certain limits, exclusionsthe difference between the corresponding retention and reinstatement premiums.the following amounts:
▪For terrorism: $700 million.
▪For Northeast wind exposures: $600 million.
▪For all other perils and/or territories: $500 million.
•Casualty reinsurance treaties - The Company purchases casualty reinsurance to reduce its exposure to large individual casualty losses, workers’ compensation catastrophe losses and casualty losses involving multiple claimants or insureds for the majority of business written by its U.S. companies. A significant casualty treaty (casualty catastrophe) in effect as of January 1, 20232024 provides significant protection for losses between $10 million and $60$70 million from single events with claims involving two or more insurable interests or for systemic events involving multiple insureds and/or policy years. The treaty also covers casualty contingency losses in excess of $5 million and up to $100 million. We have a co-participation on this casualty catastrophe treaty. For losses involving two or more claimants for primary workers’ compensation business, coverage is generally in place for losses between $10 million and $500 million. For excess workers’ compensation business, such coverage is generally in place for losses between $25 million and $500 million. Our workers’ compensation catastrophe reinsurance program is a shared cover for both excess and primary workers’ compensation business.
•Facultative reinsurance - The Company also purchases facultative reinsurance on certain individual policies or risks that are in excess of treaty reinsurance capacity.
•Other reinsurance - Depending on the business, the Company purchases specific additional reinsurance to supplement the above programs.
•Effective January 1, 2023, Lifson Re will continue to be a participant on the majority of the Company’s reinsurance placements for a 30.0% share of the placed amounts. This pertains to all traditional treaty reinsurance/retrocessional placements for both property and casualty business where there is more than one open market reinsurer participating. Lifson Re has beenis currently capitalized with $380 million of equity from a small group of sophisticated global investors with long-term investment horizons, including a minority participation by the Company. Lifson Re will participate on a fully collateralized basis.
The Company places a number of its casualty treaties on a “risk attaching” basis. Under risk attaching treaties, all claims from policies incepting during the period of the reinsurance contract are covered even if they occur after the expiration date of the reinsurance contract. If the Company is unable to renew or replace its existing reinsurance coverage, protection for unexpired policies would remain in place until their expiration. In such case, the Company could revise its underwriting strategy for new business to reflect the absence of reinsurance protection. The casualty catastrophe treaty highlighted above was purchased on a losses discovered“losses discovered” basis. Property catastrophe and workers’ compensation catastrophe reinsurance is generally placed on a “losses occurring basis,” whereby only claims occurring during the period are covered. If the Company is unable to renew or replace these reinsurance coverages, unexpired policies would not be protected, though we frequentlygenerally have the option to purchase run-off coverage in our treaties.
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Following is a summary of earned premiums and loss and loss expenses ceded to reinsurers for each of the three years ended December 31, 2022:2023:
Year Ended December 31,Year Ended December 31,
(In thousands)(In thousands)202220212020
Earned premiumsEarned premiums$1,883,263 $1,805,341 $1,499,948 
Earned premiums
Earned premiums
Losses and loss expensesLosses and loss expenses1,269,338 1,236,960 955,630 
Losses and loss expenses
Losses and loss expenses
Ceded earned premiums increased 4.3%4.0% in 20222023 to $1,883$1,959 million. The ceded losses and loss expenses ratio decreased 2increased 3 points to 70% in 2023 from 67% in 2022 from 69% in 2021.
57


2022.
The following table presents the credit quality of amounts due from reinsurers as of December 31, 2022.2023.
(In thousands)
ReinsurerRating(1)Amount
Amounts due in excess of $20 million:
Lloyd’s of LondonA+$347,927402,210 
Partner Re A+314,471 
Munich Re AA-310,985 
Berkshire HathawayAA+332,034307,878 
Munich ReAA-306,530 
Partner ReA+275,410 
Hannover Re GroupAA-191,264231,172 
Renaissance Re A+217,008 
Swiss ReAA-189,591176,377 
Renaissance ReA+163,973 
Everest ReA+155,847145,155 
Liberty MutualA96,402117,556 
Axis CapitalA+81,53886,680 
Fairfax Financial A64,300 
Korean ReA59,88457,530 
Fairfax FinancialA-55,228 
Axa InsuranceAA-46,058 
Arch Capital GroupA+45,66354,175 
Sompo Holdings GroupA+36,15747,520 
Axa Insurance AA-45,680 
TOA RE A37,140 
Nationwide Group A+32,411 
Markel Corp Group A31,827 
Helvetia Holdings GroupA+30,82331,429 
Markel CorpChubb GroupAA24,459 
MS & AD Insurance GroupA30,21620,144 
Validus Holdings GroupA24,548 
TOA ReA+22,945 
Other reinsurers:
  Rated A- or better163,198115,696 
  Secured (2)332,502485,906 
  All Others27,29950,429 
Subtotal$3,015,0373,408,138 
Residual market pools (3)180,757134,793 
Allowance for expected credit losses(8,064)(8,404)
Total$3,187,7303,534,527 
_________________
(1)S&P rating, or if not rated by S&P, A.M. Best rating.
(2)Secured by letters of credit or other forms of collateral.
(3)Many states require licensed insurers that provide workers' compensation insurance to participate in programs that provide workers' compensation to employers that cannot procure coverage from an insurer on a voluntary basis. Insurers can fulfill this residual market obligation by participating in pools where results are shared by the participating companies. The Company acts as a servicing carrier for workers' compensation pools in certain states. As a servicing carrier, the Company writes residual market business directly and then cedes 100% of this business to the respective pool. As a servicing carrier, the Company receives fee income for its services. The Company does not retain underwriting risk, and credit risk is limited as ceded balances are jointly shared by all the pool members.

5860


Contractual Obligations
Following is a summary of the Company's contractual obligations as of December 31, 2022:2023:
(In thousands)(In thousands)
(In thousands)
(In thousands)
Estimated Payments By Periods
Estimated Payments By Periods
Estimated Payments By PeriodsEstimated Payments By Periods20232024202520262027 Thereafter20242025202620272028 Thereafter
Gross reserves for lossesGross reserves for losses$4,586,303 $3,268,257 $2,461,737 $1,788,739 $1,439,989 $3,895,626 
Operating lease obligationsOperating lease obligations47,024 41,788 32,928 25,973 16,472 68,912 
Purchase obligationsPurchase obligations148,593 51,602 51,456 53,819 52,821 55,395 
Subordinated debenturesSubordinated debentures— — — — — 1,035,000 
Senior notes and other debtSenior notes and other debt— 5,300 1,954 — — 1,820,000 
Interest paymentsInterest payments125,580 125,580 125,580 125,580 125,580 3,154,164 
Other long-term liabilitiesOther long-term liabilities2,489 2,228 2,035 1,859 1,698 20,232 
Total Total$4,909,989 $3,494,755 $2,675,690 $1,995,970 $1,636,560 $10,049,329 
The estimated payments for reserves for losses and loss expenses in the above table represent the projected (undiscounted) payments for gross loss and loss expense reserves related to losses incurred as of December 31, 2022.2023. The estimated payments in the above table do not consider payments for losses to be incurred in future periods. These amounts include reserves for reported losses and reserves for incurred but not reported losses. Estimated amounts recoverable from reinsurers are not reflected. The estimated payments by year are based on historical loss payment patterns.The actual payments may differ from the estimated amounts due to changes in ultimate loss reserves and in the timing of the settlement of those reserves. In addition, at December 31, 2022,2023, the Company had commitments to invest up to $402$339 million and $146$106 million in certain investment funds and real estate construction projects, respectively. These amounts are not included in the above table.

The Company utilizes letters of credit to back certain reinsurance payments and obligations. Outstanding letters of credit were $5$29 million as of December 31, 2022.2023. The Company has made certain guarantees to state regulators that the statutory capital of certain subsidiaries will be maintained above certain minimum levels.

Off-Balance Sheet Arrangements
An off-balance sheet arrangement is any transaction, agreement or other contractual arrangement involving an unconsolidated entity under which a company has (1) made guarantees, (2) a retained or contingent interest in transferred assets, (3) an obligation under derivative instruments classified as equity or (4) any obligation arising out of a material variable interest in an unconsolidated entity that provides financing, liquidity, market risk or credit risk support to the Company, or that engages in leasing, hedging or research and development arrangements with the Company. The Company has no arrangements of these types that management believes may have a material current or future effect on our financial condition, liquidity or results of operations.
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ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
Market Risk. The fair value of the Company’s investments is subject to risks of fluctuations in credit quality and interest rates. The Company uses various models and stress test scenarios to monitor and manage interest rate risk. The Company attempts to manage its interest rate risk by maintaining an appropriate relationship between the effective duration of the investment portfolio and the approximate durationaverage number of years held for its liabilities (i.e., policy claims and debt obligations). The effective duration for the fixed maturity portfolio (including cash and cash equivalents) was 2.4 years at both December 31, 20222023 and 2021.2022.
In addition, the fair value of the Company’s international investments is subject to currency risk. The Company attempts to manage its currency risk by matching its foreign currency assets and liabilities where considered appropriate.
The following table outlines the groups of fixed maturity securities and their effective duration at December 31, 2022:2023:
Effective
Duration
Effective
Duration
Duration
Duration
($ in thousands)
($ in thousands)
($ in thousands)($ in thousands)(Years)Fair Value(Years)Fair Value
Mortgage-backed securitiesMortgage-backed securities4.5$1,669,056 
Mortgage-backed securities
Mortgage-backed securities
State and municipalState and municipal3.32,942,025 
U.S. government and government agenciesU.S. government and government agencies3.1892,258 
Foreign government
CorporateCorporate2.76,703,992 
Foreign government2.21,401,522 
Loans receivableLoans receivable1.3187,981 
Asset-backed securitiesAsset-backed securities0.93,982,773 
Cash and cash equivalentsCash and cash equivalents0.01,449,346 
TotalTotal2.4$19,228,953 
Duration is a common measure of the price sensitivity of fixed maturity securities to changes in interest rates. The Company determines the estimated change in fair value of the fixed maturity securities, assuming parallel shifts in the yield curve for treasury securities while keeping spreads between individual securities and treasury securities static. The estimated fair value at specified levels at December 31, 20222023 would be as follows:
(In thousands)(In thousands)Estimated Fair ValueChange in Fair Value(In thousands)Estimated Fair ValueChange in Fair Value
Change in interest rates:Change in interest rates:Change in interest rates:
300 basis point rise300 basis point rise$17,931,180 $(1,297,772)
200 basis point rise200 basis point rise18,344,941 (884,011)
100 basis point rise100 basis point rise18,778,053 (450,899)
Base scenarioBase scenario19,228,952 — 
100 basis point decline100 basis point decline19,692,291 463,339 
200 basis point decline200 basis point decline20,161,330 932,378 
300 basis point decline300 basis point decline20,632,243 1,403,291 

Arbitrage investing differs from other types of investments in that its focus is on transactions and events believed likely to bring about a change in value over a relatively short time period (usually four months or less). The Company believes that this makes arbitrage investments less vulnerable to changes in general stock market conditions. Potential changes in market conditions are also mitigated by the implementation of hedging strategies, including short sales.
Additionally, the arbitrage positions are generally hedged against market declines by purchasing put options, selling call options or entering into swap contracts. The Company's merger arbitrage securities are primarily exposed to the risk of completion of announced deals, which are subject to regulatory as well as transactional and other risks.
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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
Report of Independent Registered Public Accounting Firm
To the Stockholders and the Board of Directors
W. R. Berkley Corporation:

Opinion on the Consolidated Financial Statements
We have audited the accompanying consolidated balance sheets of W. R. Berkley Corporation and subsidiaries (the Company) as of December 31, 20222023 and 2021,2022, the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the years in the three‑year period ended December 31, 2022,2023, and the related notes and financial statement schedules II to VI (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 20222023 and 2021,2022, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2022,2023, in conformity with U.S. generally accepted accounting principles.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2022,2023, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 24, 202323, 2024 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.
Basis for Opinion
These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of a critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
Reserves for losses and loss expenses
As discussed in Notes 1 and 1413 to the consolidated financial statements, the Company estimates the reserves for losses and loss expenses (reserves) using a variety of actuarial techniques and methods. The key assumptions used to arrive at the best estimate of recorded reserves are expected loss ratios, rate of loss cost inflation, reported and paid loss emergence patterns, loss frequency and severity, and the loss reporting lag. Such amounts are adjusted for certain qualitative factors. The reserves as of December 31, 20222023 were $17.0$18.7 billion.
We identified the assessment of the estimate of reserves as a critical audit matter because it involved significant measurement uncertainty, which required complex auditor judgement. Specialized actuarial skills and knowledge were required to evaluate the actuarial method or methods and assumptions used. Assumptions included loss development
6163


factors; the weighting of actuarial methods when more than one was used; the impact of qualitative factors; and whether payments are fixed and reliably determinable for certain reserves subject to discounting.
The following are the primary procedures we performed to address the critical audit matter. WeWith the assistance of actuarial professionals, when appropriate, we evaluated the design and tested the operating effectiveness of certain internal controls over the Company’s reserving process. This included controls over the Company’s process to develop the Company’s best estimate of reserves based on actuarial methodologies and assumptions employed by the Company’s actuaries. We involved actuarial professionals with specialized skills and knowledge, who assisted in:
•examining the Company’s actuarial methodologies for compliance with Actuarial Standards of Practice;Practice
•evaluating the Company’s ability to discount certain reserves by comparing the expected payout pattern of claims paid to actual claims paid;paid
•evaluating the Company’s actuarial point estimate by performing independent actuarial analyses for certain of the larger, more complex businesses;businesses
•evaluating the Company’s actuarial point estimate by examining the Company actuaries’ process, and key assumptions for certain of the remaining businesses;businesses
•developing an independent range of reserves based on actuarial methodologies and assumptions and comparing to the Company’s recorded reserves;reserves
•evaluating the Company’s recorded reserves and year-over-year movements of the Company’s reserves relative to, and within, the independently developed range of reserves.

/S/ KPMG LLP
We have served as the Company’s auditor since 1972.
New York, New York
February 24, 202323, 2024


6264


W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF INCOME
Year Ended December 31, Year Ended December 31,
(In thousands, except per share data)(In thousands, except per share data)202220212020(In thousands, except per share data)202320222021
REVENUES:REVENUES:
Net premiums writtenNet premiums written$10,004,070 $8,862,867 $7,262,437 
Net premiums written
Net premiums written
Change in net unearned premiumsChange in net unearned premiums(442,641)(756,836)(331,594)
Net premiums earnedNet premiums earned9,561,429 8,106,031 6,930,843 
Net investment incomeNet investment income779,185 671,618 583,821 
Net investment gains:Net investment gains:
Net realized and unrealized gains on investments
Net realized and unrealized gains on investments
Net realized and unrealized gains on investments Net realized and unrealized gains on investments217,311 106,958 73,514 
Change in allowance for expected credit losses on investmentsChange in allowance for expected credit losses on investments(14,914)(16,326)29,486 
Net investment gainsNet investment gains202,397 90,632 103,000 
Revenues from non-insurance businessesRevenues from non-insurance businesses509,548 489,151 389,888 
Insurance service feesInsurance service fees110,544 93,857 88,777 
Other incomeOther income3,396 4,177 2,596 
Total revenuesTotal revenues11,166,499 9,455,466 8,098,925 
OPERATING COSTS AND EXPENSES:OPERATING COSTS AND EXPENSES:  
Losses and loss expenses
Losses and loss expenses
Losses and loss expensesLosses and loss expenses5,861,750 4,953,960 4,468,706 
Other operating costs and expensesOther operating costs and expenses2,961,505 2,599,270 2,390,392 
Expenses from non-insurance businessesExpenses from non-insurance businesses493,189 472,151 384,488 
Interest expenseInterest expense130,374 147,180 150,537 
Total operating costs and expensesTotal operating costs and expenses9,446,818 8,172,561 7,394,123 
Income before income taxesIncome before income taxes1,719,681 1,282,905 704,802 
Income tax expenseIncome tax expense(334,727)(251,890)(171,817)
Net income before noncontrolling interestsNet income before noncontrolling interests1,384,954 1,031,015 532,985 
Noncontrolling interestsNoncontrolling interests(3,892)(8,525)(2,315)
Net income to common stockholdersNet income to common stockholders$1,381,062 $1,022,490 $530,670 
NET INCOME PER SHARE:NET INCOME PER SHARE:  
BasicBasic$4.99 $3.69 $1.89 
Basic
Basic
DilutedDiluted$4.94 $3.66 $1.87 
See accompanying notes to consolidated financial statements.



6365


W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, Year Ended December 31,
(In thousands)(In thousands)202220212020(In thousands)202320222021
Net income before noncontrolling interestsNet income before noncontrolling interests$1,384,954 $1,031,015 $532,985 
Other comprehensive (loss) gain.:  
Other comprehensive gain (loss):
Change in unrealized translation adjustmentsChange in unrealized translation adjustments1,179 (20,969)29,927 
Change in unrealized investment (losses) gains, net of taxes(983,803)(198,812)140,250 
Change in unrealized translation adjustments
Change in unrealized translation adjustments
Change in unrealized investment gains (losses), net of taxes
Other comprehensive (loss) gain(982,624)(219,781)170,177 
Other comprehensive gain (loss)
Other comprehensive gain (loss)
Other comprehensive gain (loss)
Comprehensive incomeComprehensive income402,330 811,234 703,162 
Noncontrolling interestsNoncontrolling interests(3,890)(8,523)(2,313)
Comprehensive income to common stockholdersComprehensive income to common stockholders$398,440 $802,711 $700,849 
See accompanying notes to consolidated financial statements.


64


W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
 December 31,
(In thousands, except share data)20222021
Assets  
Investments:  
Fixed maturity securities (amortized cost of $18,715,483 and $16,471,304; allowance for expected credit losses of $37,466 and $22,625 at December 31, 2022 and 2021)$17,587,349 $16,602,673 
Investment funds1,608,548 1,480,612 
 Real estate1,340,622 1,852,508 
Arbitrage trading account944,230 1,179,606 
Equity securities1,185,894 941,243 
Loans receivable (net of allowance for expected credit losses of $1,791 and $1,718 at December 31, 2022 and 2021)193,002 115,172 
Total investments22,859,645 22,171,814 
Cash and cash equivalents1,449,346 1,568,843 
Premiums and fees receivable (net of allowance for expected credit losses of $30,660 and $25,218 at December 31, 2022 and 2021)2,779,244 2,522,972 
Due from reinsurers (net of allowance for expected credit losses of $8,064 and $7,713 at December 31, 2022 and 2021)3,187,730 2,923,026 
Deferred policy acquisition costs763,486 676,145 
Prepaid reinsurance premiums696,468 676,915 
Trading account receivable from brokers and clearing organizations233,863 — 
Property, furniture and equipment423,232 419,883 
Goodwill185,509 169,652 
Accrued investment income166,784 122,938 
Current federal and foreign income taxes39,123 23,570 
Deferred federal and foreign income taxes340,647 57,425 
Other assets736,022 753,231 
Total assets$33,861,099 $32,086,414 
Liabilities and Equity  
Liabilities:  
Reserves for losses and loss expenses$17,011,223 $15,390,888 
Unearned premiums5,297,654 4,847,160 
Due to reinsurers523,131 514,980 
Trading account securities sold but not yet purchased— 1,169 
Trading account payable to brokers and clearing organizations— 53,636 
Current federal and foreign income taxes34,350 21,068 
Deferred federal and foreign income taxes11,646 17,470 
Senior notes and other debt1,828,823 2,259,416 
Subordinated debentures1,008,371 1,007,652 
Other liabilities1,377,740 1,305,245 
         Total liabilities27,092,938 25,418,684 
Equity: 
Preferred stock, par value $.10 per share:  
Authorized 5,000,000 shares; issued and outstanding — none— — 
Common stock, par value $.20 per share:  
Authorized 1,250,000,000 shares and 750,000,000 shares, respectively, issued and outstanding, net of treasury shares, 264,546,100 and 265,170,882 shares, respectively105,803 105,803 
Additional paid-in capital997,534 981,104 
Retained earnings10,161,005 9,015,135 
Accumulated other comprehensive loss(1,264,581)(281,955)
Treasury stock, at cost, 264,468,528 and 263,843,868 shares, respectively(3,251,429)(3,167,076)
Total common stockholders’ equity6,748,332 6,653,011 
Noncontrolling interests19,829 14,719 
Total equity6,768,161 6,667,730 
Total liabilities and equity$33,861,099 $32,086,414 
See accompanying notes to consolidated financial statements.
65


W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
 Year Ended December 31,
(In thousands, except per share data)202220212020
COMMON STOCK:  
Beginning and end of period$105,803 $105,803 $105,803 
ADDITIONAL PAID IN CAPITAL:  
Beginning of period$981,104 $977,215 $1,020,774 
Restricted stock units issued(32,622)(44,041)(38,491)
Restricted stock units expensed49,052 47,930 48,567 
Change in controlling financial interest of a subsidiary— — (53,635)
End of period$997,534 $981,104 $977,215 
RETAINED EARNINGS:  
Beginning of period$9,015,135 $8,348,381 $7,932,372 
Cumulative effect adjustment resulting from changes in accounting principles— — (30,514)
Net income to common stockholders1,381,062 1,022,490 530,670 
Dividends ($0.89, $1.34, and $0.31 per share, respectively)(235,192)(355,736)(84,147)
End of period$10,161,005 $9,015,135 $8,348,381 
ACCUMULATED OTHER COMPREHENSIVE LOSS:  
Unrealized investment (losses) gains:  
Beginning of period$90,900 $289,714 $124,514 
Cumulative effect adjustment resulting from changes in accounting principles— — 24,952 
Change in unrealized (losses) gains on securities without an allowance for expected
credit losses		(955,435)(208,938)108,244 
Change in unrealized (losses) gains on securities with an allowance for expected credit losses(28,370)10,124 32,004 
End of period(892,905)90,900 289,714 
Currency translation adjustments:  
Beginning of period(372,855)(351,886)(381,813)
Net change in period1,179 (20,969)29,927 
End of period(371,676)(372,855)(351,886)
Total accumulated other comprehensive loss$(1,264,581)$(281,955)$(62,172)
TREASURY STOCK:  
Beginning of period$(3,167,076)$(3,058,425)$(2,726,711)
Stock exercised/vested9,428 13,264 13,917 
Stock issued359 511 726 
Stock repurchased(94,140)(122,426)(346,357)
End of period$(3,251,429)$(3,167,076)$(3,058,425)
NONCONTROLLING INTERESTS:  
Beginning of period$14,719 $14,995 $43,403 
Contributions (distributions)1,220 (8,799)(30,721)
Net income3,892 8,525 2,315 
Other comprehensive loss, net of tax(2)(2)(2)
End of period$19,829 $14,719 $14,995 
See accompanying notes to consolidated financial statements.

66


W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
 December 31,
(In thousands, except share data)20232022
Assets  
Investments:  
Fixed maturity securities (amortized cost of $20,915,245 and $18,715,483; allowance for expected credit losses of $36,751 and $37,466 at December 31, 2023 and 2022)$20,178,308 $17,587,349 
Investment funds1,621,655 1,608,548 
 Real estate1,249,874 1,340,622 
Arbitrage trading account938,049 944,230 
Equity securities1,090,347 1,185,894 
Loans receivable (net of allowance for expected credit losses of $3,004 and $1,791 at December 31, 2023 and 2022)201,271 193,002 
Total investments25,279,504 22,859,645 
Cash and cash equivalents1,363,195 1,449,346 
Premiums and fees receivable (net of allowance for expected credit losses of $35,110 and $30,660 at December 31, 2023 and 2022)3,109,334 2,779,244 
Due from reinsurers (net of allowance for expected credit losses of $8,404 and $8,064 at December 31, 2023 and 2022)3,534,527 3,187,730 
Deferred policy acquisition costs861,609 763,486 
Prepaid reinsurance premiums758,927 696,468 
Trading account receivable from brokers and clearing organizations303,614 233,863 
Property, furniture and equipment426,803 423,232 
Goodwill174,597 185,509 
Accrued investment income213,408 166,784 
Current federal and foreign income taxes1,318 39,123 
Deferred federal and foreign income taxes309,623 340,647 
Other assets865,556 736,022 
Total assets$37,202,015 $33,861,099 
Liabilities and Equity  
Liabilities:  
Reserves for losses and loss expenses$18,739,652 $17,011,223 
Unearned premiums5,922,326 5,297,654 
Due to reinsurers631,164 523,131 
Trading account securities sold but not yet purchased9,357 — 
Current federal and foreign income taxes47,525 34,350 
Deferred federal and foreign income taxes42,660 11,646 
Senior notes and other debt1,827,951 1,828,823 
Subordinated debentures1,009,090 1,008,371 
Other liabilities1,503,053 1,377,740 
         Total liabilities29,732,778 27,092,938 
Equity: 
Preferred stock, par value $.10 per share:  
Authorized 5,000,000 shares; issued and outstanding — none— — 
Common stock, par value $.20 per share:  
Authorized 1,250,000,000 shares; issued and outstanding, net of treasury shares, 256,544,757 and 264,546,100 shares, respectively105,803 105,803 
Additional paid-in capital1,017,691 997,534 
Retained earnings11,040,908 10,161,005 
Accumulated other comprehensive loss(925,838)(1,264,581)
Treasury stock, at cost, 272,469,871 and 264,468,528 shares, respectively(3,783,133)(3,251,429)
Total common stockholders’ equity7,455,431 6,748,332 
Noncontrolling interests13,806 19,829 
Total equity7,469,237 6,768,161 
Total liabilities and equity$37,202,015 $33,861,099 
See accompanying notes to consolidated financial statements.
67


W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
 Year Ended December 31,
(In thousands, except per share data)202320222021
COMMON STOCK:  
Beginning and end of period$105,803 $105,803 $105,803 
ADDITIONAL PAID IN CAPITAL:  
Beginning of period$997,534 $981,104 $977,215 
Restricted stock units issued(29,043)(32,622)(44,041)
Restricted stock units expensed49,200 49,052 47,930 
End of period$1,017,691 $997,534 $981,104 
RETAINED EARNINGS:  
Beginning of period$10,161,005 $9,015,135 $8,348,381 
Net income to common stockholders1,381,359 1,381,062 1,022,490 
Dividends ($1.93, $0.89, and $1.34 per share, respectively)(501,456)(235,192)(355,736)
End of period$11,040,908 $10,161,005 $9,015,135 
ACCUMULATED OTHER COMPREHENSIVE LOSS:  
Unrealized investment (losses) gains:  
Beginning of period$(892,905)$90,900 $289,714 
Change in unrealized gains (losses) on securities without an allowance for expected
credit losses		305,908 (955,435)(208,938)
Change in unrealized gains (losses) on securities with an allowance for expected credit losses643 (28,370)10,124 
End of period(586,354)(892,905)90,900 
Currency translation adjustments:  
Beginning of period(371,676)(372,855)(351,886)
Net change in period32,192 1,179 (20,969)
End of period(339,484)(371,676)(372,855)
Total accumulated other comprehensive loss$(925,838)$(1,264,581)$(281,955)
TREASURY STOCK:  
Beginning of period$(3,251,429)$(3,167,076)$(3,058,425)
Stock exercised/vested10,381 9,787 13,775 
Stock repurchased(537,163)(94,140)(122,426)
Other(4,922)— — 
End of period$(3,783,133)$(3,251,429)$(3,167,076)
NONCONTROLLING INTERESTS:  
Beginning of period$19,829 $14,719 $14,995 
(Distributions) contributions(8,508)1,220 (8,799)
Net income2,487 3,892 8,525 
Other comprehensive loss, net of tax(2)(2)(2)
End of period$13,806 $19,829 $14,719 
See accompanying notes to consolidated financial statements.

68


W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
Year Ended December 31, Year Ended December 31,
(In thousands)(In thousands)202220212020(In thousands)202320222021
CASH FROM OPERATING ACTIVITIES:CASH FROM OPERATING ACTIVITIES:  CASH FROM OPERATING ACTIVITIES:  
Net income to common stockholdersNet income to common stockholders$1,381,062 $1,022,490 $530,670 
Adjustments to reconcile net income to net cash from operating activities:Adjustments to reconcile net income to net cash from operating activities:  Adjustments to reconcile net income to net cash from operating activities:  
Net investment gainsNet investment gains(202,397)(90,632)(103,000)
Depreciation and amortization55,872 129,682 135,065 
Depreciation and (accretion) amortization
Noncontrolling interestsNoncontrolling interests3,892 8,525 2,315 
Investment fundsInvestment funds(145,099)(220,015)(54,253)
Stock incentive plansStock incentive plans49,411 46,680 49,658 
Change in:Change in: Change in: 
Arbitrage trading accountArbitrage trading account(53,291)(268,649)(67,943)
Premiums and fees receivablePremiums and fees receivable(268,171)(364,395)(173,618)
Reinsurance accountsReinsurance accounts(266,307)(433,644)(313,525)
Deferred policy acquisition costsDeferred policy acquisition costs(88,844)(121,663)(38,691)
Current income taxesCurrent income taxes(3,534)(43,890)49,021 
Deferred income taxesDeferred income taxes(64,712)7,630 (34,057)
Reserves for losses and loss expensesReserves for losses and loss expenses1,684,254 1,635,774 1,176,049 
Unearned premiumsUnearned premiums466,590 786,627 415,956 
OtherOther19,878 89,467 43,039 
Net cash from operating activitiesNet cash from operating activities2,568,604 2,183,987 1,616,686 
CASH FLOWS (USED IN) FROM INVESTING ACTIVITIES:  
CASH FLOWS USED IN INVESTING ACTIVITIES:CASH FLOWS USED IN INVESTING ACTIVITIES:  
Proceeds from sale of fixed maturity securitiesProceeds from sale of fixed maturity securities797,948 1,842,139 3,832,555 
Proceeds from sale of equity securitiesProceeds from sale of equity securities82,319 126,980 114,763 
Distributions from (contributions to) investment funds24,623 101,050 (3,042)
(Contributions to) distributions from investment funds
Proceeds from maturities and prepayments of fixed maturity securitiesProceeds from maturities and prepayments of fixed maturity securities4,891,179 6,067,230 3,864,327 
Purchase of fixed maturity securitiesPurchase of fixed maturity securities(8,036,680)(10,716,748)(7,551,591)
Purchase of equity securitiesPurchase of equity securities(340,482)(464,645)(253,031)
Real estate (purchased) soldReal estate (purchased) sold(45,920)166,886 178,934 
Change in loans receivableChange in loans receivable(83,212)(27,421)1,467 
Change in loans receivable
Change in loans receivable
Net additions to property, furniture and equipmentNet additions to property, furniture and equipment(52,684)(66,634)(38,171)
Change in balances due from security brokersChange in balances due from security brokers14,337 (17,983)(26,515)
Cash received in connection with business dispositionCash received in connection with business disposition906,789 — — 
Payment for business purchased, net of cash acquiredPayment for business purchased, net of cash acquired(49,572)— — 
Net cash (used in) from investing activities(1,891,355)(2,989,146)119,696 
Net cash used in investing activities
CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES:CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES:  CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES:  
Net (payments) proceeds from issuance of debtNet (payments) proceeds from issuance of debt(3,309)1,034,107 741,637 
Repayment of senior notes and other debt
Repayment of senior notes and other debt
Repayment of senior notes and other debtRepayment of senior notes and other debt(426,503)(504,952)(652,751)
Cash dividends to common stockholdersCash dividends to common stockholders(235,192)(355,736)(84,147)
Purchase of common treasury sharesPurchase of common treasury shares(94,140)(122,426)(346,357)
Other, netOther, net(12,848)(45,162)(56,225)
Net cash (used in) from financing activitiesNet cash (used in) from financing activities(771,992)5,831 (397,843)
Net impact on cash due to change in foreign exchange ratesNet impact on cash due to change in foreign exchange rates(24,754)(4,195)10,117 
Net (decrease) increase in cash and cash equivalents(119,497)(803,523)1,348,656 
Net decrease in cash and cash equivalents
Cash and cash equivalents at beginning of yearCash and cash equivalents at beginning of year1,568,843 2,372,366 1,023,710 
Cash and cash equivalents at end of yearCash and cash equivalents at end of year$1,449,346 $1,568,843 $2,372,366 
See accompanying notes to consolidated financial statements.
6769


W. R. BERKLEY CORPORATION AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
For the years ended December 31, 2023, 2022 2021 and 20202021

(1) Summary of Significant Accounting Policies
(A) Principles of consolidation and basis of presentation
The consolidated financial statements, which include the accounts of W. R. Berkley Corporation and its subsidiaries (the "Company"), have been prepared on the basis of U.S. generally accepted accounting principles ("GAAP"). All significant intercompany transactions and balances have been eliminated. Reclassifications have been made in the 20212022 and 20202021 financial statements as originally reported to conform to the presentation of the 20222023 financial statements. Shares outstanding and per share amounts have been adjusted to reflectFor the 3-for-2 common stock split effected on March 23, 2022. In the fourth quarter of 2022,year ended December 31, 2021, the Company adjusteddid not correct the proceeds from sale of fixed maturity securities and purchase of fixed maturity securities lines within the consolidated statements of cash flows for an incremental inter-company elimination which resulted in no impact on the total amount of investing activities. For the years ended December 31, 2021 and 2020, the Company did not correct these line items as the effects were not material and had no impact on the total amount of investing activities.
The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the revenues and expenses reflected during the reporting period. The most significant items on our balance sheet that involve a greater degree of accounting estimates that are subject to change in the future are the valuation of investments, allowance for expected credit losses on investments, reserves for losses and loss expenses and premium estimates. Actual results could differ from those estimates.
(B) Revenue recognition
Insurance premiums are recognized as written at the inception of the policy. Reinsurance premiums are estimated based upon information received from ceding companies, and subsequent differences from such estimates are recorded in the period they are determined. Insurance and reinsurance premiums are primarily earned on a pro rata basis over the policy term. Fees for services are earned over the period that the services are provided. Premiums and fees receivable are reported net of an allowance for expected credit losses, with the allowance being estimated based on current and future expected conditions, historical loss data and specific identification of collectability concerns where applicable. Changes in the allowance are reported within other operating costs and expenses.
Audit premiums are recognized when they are reliably determinable. The change in accruals for earned but unbilled audit premiums increased (decreased) net premiums written and premiums earned by $19 million, $25 million and $10 million in 2023, 2022 and $(27) million in 2022, 2021, and 2020, respectively.
Revenues from non-insurance businesses are derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aircraft services provided to the general, commercial and military aviation markets. These aircraft services include (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenue is recognized upon the shipment of products and parts, the delivery of aircraft, the delivery of fuel, and over the completion period of services.
Insurance service fee revenue represents servicing fees for program administration and claims management services provided by the Company, including workers' compensation assigned risk plans, as well as insurance brokerage and risk management services. Fees for program administration, claims management and risk management services are primarily recognized ratably over the related contract period for which the underlying services are rendered. Commissions for insurance brokerage are generally recognized when the underlying insurance policy is effective.
(C) Cash and cash equivalents
Cash equivalents consist of funds invested in money market accounts and investments with an effective maturity of three months or less when purchased.
(D) Investments
Fixed maturity securities classified as available for sale are carried at estimated fair value, with unrealized gains and losses, net of applicable income taxes, excluded from earnings and reported as a component of comprehensive income and a separate component of stockholders' equity. Fixed maturity securities that the Company has the positive intent and ability to
68


hold to maturity are classified as held to maturity and reported at amortized cost. Investment income from fixed maturity securities is recognized based on the constant effective yield method. Premiums and discounts on mortgage-backed securities are adjusted for the effects of actual and anticipated prepayments on a retrospective basis.
70


Equity securities with readily determinable fair values are measured at fair value, with changes in the fair value recognized in net income within net realized and unrealized gains on investments.
Fixed maturity securities that the Company purchased with the intent to sell in the near-term are classified as trading account securities and are reported at estimated fair value. Realized and unrealized gains and losses from trading activity are reported as net investment income and are recorded at the trade date. Short sales and short call options are presented as trading securities sold but not yet purchased. Unsettled trades and the net margin balances held by the clearing broker are presented as a trading account receivable from brokers and clearing organizations.
Investment funds are carried under the equity method of accounting. The Company's share of the earnings or losses of investment funds is primarily reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.
Loans receivable primarily represent commercial and real estate mortgage loans and bank loans and are carried at amortized cost. The accrual of interest on loans receivable is discontinued if the loan is 90 days past due based on the contractual terms of the loan unless the loan is adequately secured and in process of collection. In general, loans are placed on non-accrual status or charged off at an earlier date if collection of principal or interest is considered doubtful. Interest on these loans is accounted for on a cash basis until qualifying for return to accrual status. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” Fair value of investments is determined based on a fair value hierarchy that prioritizes the use of observable inputs over the use of unobservable inputs and requires the use of observable inputs when available. (See Note 1312 of the Notes to Consolidated Financial Statements.)
Realized gains or losses represent the difference between the cost of securities sold and the proceeds realized upon sale and are recorded at the trade date. The Company uses primarily the first-in, first-out method to determine the cost of securities sold.
For available for sale securities in an unrealized loss position where the Company intends to sell, or it is more likely than not that it will be required to sell the security before recovery in value, the amortized cost basis is written down to fair value through net investment gains. For available for sale securities in an unrealized loss position where the Company does not intend to sell, or it is more likely than not that it will not be required to sell the security before recovery in value, the Company evaluates whether the decline in fair value has resulted from credit losses or all other factors (non-credit factors). In making this assessment, the Company considers the extent to which fair value is less than amortized cost, changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, an allowance for expected credit losses is recorded for the credit loss through net investment gains, limited by the amount that the fair value is less than the amortized cost basis. The allowance is adjusted for any change in expected credit losses and subsequent recoveries through net investment gains. The impairment related to non-credit factors is recognized in comprehensive income (loss).
For financial assets carried at amortized cost, which includes held to maturity securities and loans receivable, the Company estimates an allowance for expected credit losses based on relevant information about past events, including historical loss experience, current conditions and forecasts that affect the expected collectability of the amortized cost of the financial asset. The allowance for expected credit losses is presented as a reduction to amortized cost of the financial asset in the consolidated balance sheet and changes to the estimate for expected credit losses are recognized through net investment gains.
The Company’s credit assessment of allowance for expected credit losses uses a third party model for available for sale and held to maturity securities, as well as loans receivable. The allowance for expected credit losses is generally based on the performance of the underlying collateral under various economic and default scenarios that involve subjective judgments and estimates by management. Modeling these securities involves various factors, such as projected default rates, the nature and realizable value of the collateral, if any, the ability of the issuer to make scheduled payments, historical performance and other relevant economic and performance factors. A discounted cash flow analysis is used to ascertain the amount of the allowance for expected credit losses, if any. In general, the model reverts to the rating-level long-term average marginal default rates based on 10 years of historical data, beyond the forecast period. For other inputs, the model in most cases reverts to the baseline long-
69


termlong-term assumptions linearly over 5 years beyond the forecast period. The long-term assumptions are based on the historical averages.
71


The Company reports accrued investment income separately from fixed maturity securities, and has elected not to measure an allowance for expected credit losses for accrued investment income. Accrued investment income is written off through net investment income at the time the issuer of the bond defaults or is expected to default on payments.
Real estate held for investment purposes is initially recorded at the purchase price, which is generally fair value, and is subsequently reported at cost less accumulated depreciation. Real estate taxes, interest and other costs incurred during development and construction are capitalized. Buildings are depreciated on a straight-line basis over the estimated useful lives of the building. Minimum rental income is recognized on a straight-line basis over the lease term. Income and expenses from real estate are reported as net investment income. The carrying value of real estate is reviewed for impairment and an impairment loss is recognized if the estimated undiscounted cash flows from the use and disposition of the property are less than the carrying value of the property.
(E) Per share data
The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by weighted average number of common shares outstanding during the year (including 11,416,85611,663,450 common shares held in a grantor trust). The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since the shares deliverable under vested RSUs were already included in diluted shares outstanding. Diluted EPS is based upon the weighted average number of basic and common equivalent shares outstanding during the year and is calculated using the treasury stock method for stock incentive plans. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect.
(F) Deferred policy acquisition costs
Acquisition costs associated with the successful acquisition of new and renewed insurance and reinsurance contracts are deferred and amortized ratably over the terms of the related contracts. Ceding commissions received on reinsurance contracts are netted against acquisition costs and are recognized ratably over the life of the contract. Deferred policy acquisition costs are presented net of unearned ceding commissions. Deferred policy acquisition costs are comprised primarily of commissions, as well as employment-related underwriting costs and premium taxes. Deferred policy acquisition costs are reviewed to determine if they are recoverable from future income and, if not, are charged to expense. The recoverability of deferred policy acquisition costs is evaluated separately by each of our operating companies.units. Future investment income is taken into account in measuring the recoverability of deferred policy acquisition costs.
(G) Reserves for losses and loss expenses
Reserves for losses and loss expenses are an accumulation of amounts determined on the basis of (1) evaluation of claims for business written directly by the Company; (2) estimates received from other companies for reinsurance assumed by the Company; and (3) estimates for losses incurred but not reported (based on Company and industry experience). These estimates are periodically reviewed and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments are reflected in the statements of income in the period in which they are determined. The Company discounts its reserves for excess and assumed workers' compensation claims using a risk-free or statutory rate. (See Note 1413 of Notes to Consolidated Financial Statements.)
(H) Reinsurance ceded
The unearned portion of premiums ceded to reinsurers is reported as prepaid reinsurance premiums and earned ratably over the policy term. The estimated amounts of reinsurance recoverable on unpaid losses are reported as due from reinsurers. To the extent any reinsurer does not meet its obligations under reinsurance agreements, the Company must discharge its liability. Amounts due from reinsurers are reflected net of funds held where the right of offset is present. The Company has provided an allowance for expected credit losses for estimated uncollectible reinsurance. The allowance is estimated based on the composition of the recoverable balance, considering reinsurer credit ratings, collateral received from financial institutions and funds withheld arrangements, length of collection periods, probability of default methodology, and specific identification of collectability concerns. Changes in the allowance are reported within losses and loss expenses.

70


(I) Deposit accounting
Contracts that do not meet the risk transfer requirements of GAAP are accounted for using the deposit accounting method. Under this method, an asset or liability is recognized at the inception of the contract based on consideration paid or received. The amount of the deposit asset or liability is adjusted at subsequent reporting dates using the interest method with a
72


corresponding credit or charge to interest income or expense. Deposit liabilities for assumed reinsurance contracts were $33$31 million and $35$33 million at December 31, 20222023 and 2021,2022, respectively.
(J) Federal and foreign income taxes
The Company files a consolidated income tax return in the U.S. and foreign tax returns in countries where it has overseas operations. The Company's method of accounting for income taxes is the asset and liability method. Under this method, deferred tax assets and liabilities are measured using tax rates currently in effect or expected to apply in the years in which those temporary differences are expected to reverse. Interest and penalties, if any, are reported as income tax expense. The Company believes there are no uncertain tax positions that would require disclosure under GAAP. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that all or a portion of the deferred tax assets will not be realized.
(K) Foreign currency
Gains and losses resulting from foreign currency transactions (transactions denominated in a currency other than the entity's functional currency) are reported on the statements of income as other operating costs and expenses. Unrealized gains or losses resulting from translating the results of non-U.S. dollar denominated operations are reported in accumulated other comprehensive income. Revenues and expenses denominated in currencies other than U.S. dollars are generally translated at the weighted average exchange rate during the year. Assets and liabilities are translated at the rate of exchange in effect at the balance sheet date.
(L) Property, furniture and equipment
Property, furniture and equipment are carried at cost less accumulated depreciation. Depreciation is calculated using the estimated useful lives of the respective assets. Depreciation expense was $52$51 million, $52 million and $53$52 million for 2023, 2022 2021 and 2020,2021, respectively.
(M) Comprehensive income
Comprehensive income encompasses all changes in stockholders' equity (except those arising from transactions with stockholders) and includes net income, net unrealized holding gains or losses on available for sale securities and unrealized foreign currency translation adjustments.
(N) Goodwill and other intangible assets
Goodwill and other intangible assets are tested for impairment on an annual basis and at interim periods where circumstances require. The Company's impairment test as of December 31, 20222023 indicated that there were no material impairment losses related to goodwill and other intangible assets. Intangible assets of $102$119 million and $85$102 million are included in other assets as of December 31, 20222023 and 2021,2022, respectively.
(O) Restricted stock units
The costs resulting from all share-based payment transactions with employees are recognized in the consolidated financial statements using a fair-value-based measurement method. Compensation cost is recognized for financial reporting purposes over the period in which the employee is required to provide service in exchange for the award (generally the vesting period).
(P) Statements of cash flows
Interest payments were $114 million, $138 million and $141 million in 2023, 2022 and $155 million in 2022, 2021, and 2020, respectively. Income taxes paid were $332 million, $295 million and $244 million in 2023, 2022 and $103 million in 2022, 2021, and 2020, respectively. Other non-cash items include unrealized investment gains and losses. (See Note 1110 of Notes to Consolidated Financial Statements.)


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(Q) Recent accounting pronouncements
Recently adopted accounting pronouncements:
All accounting and reporting standards that became effective in 20222023 were either not applicable to the Company or their adoption did not have a material impact on the Company.
Accounting and reporting standards that are not yet effective:
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All recently issued but not yet effective accounting and reporting standards are either not applicable to the Company or are not expected to have a material impact on the Company.

(2)    Acquisitions

In March 2022, the Company acquired an 80.0% ownership interest for $51.1 million in a company engaged in residential and commercial textiles. The fair value of the assets acquired and liabilities assumed have been estimated based on a third party valuation.

    The following table summarizes the estimated fair value of net assets acquired and liabilities assumed for the business combination completed in 2022:
(In thousands)2022
Cash and cash equivalents$1,564 
Real estate, furniture and equipment6,000 
Intangible assets25,600 
Goodwill15,857 
Other assets20,349 
Total assets acquired69,370 
Other liabilities assumed(12,420)
Noncontrolling interest(5,814)
  Net assets acquired$51,136 
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(3)    Consolidated Statements of Comprehensive Income (Loss) Income
The following tables present the components of the changes in accumulated other comprehensive income (loss) income(AOCI) as of and for the years ended December 31, 20222023 and 2021:2022:
(In thousands)(In thousands)
December 31, 2022Unrealized Investment (Losses) GainsCurrency Translation AdjustmentsAccumulated Other Comprehensive Loss
(In thousands)
(In thousands)
December 31, 2023
December 31, 2023
December 31, 2023Unrealized Investment Gains (Losses)Currency Translation AdjustmentsAccumulated Other Comprehensive Income (Loss)
Changes in AOCIChanges in AOCI
Beginning of period
Beginning of period
Beginning of periodBeginning of period$90,900 $(372,855)$(281,955)
Other comprehensive (loss) income before reclassifications(1,054,838)1,179 (1,053,659)
Other comprehensive income before reclassifications
Other comprehensive income before reclassifications
Other comprehensive income before reclassifications
Amounts reclassified from AOCIAmounts reclassified from AOCI71,035 — 71,035 
Other comprehensive (loss) income(983,803)1,179 (982,624)
Other comprehensive income
Unrealized investment loss related to noncontrolling interestUnrealized investment loss related to noncontrolling interest(2)— (2)
Ending balanceEnding balance$(892,905)$(371,676)$(1,264,581)
Amounts reclassified from AOCIAmounts reclassified from AOCI
Pre-taxPre-tax$89,918 (1)$— $89,918 
Pre-tax
Pre-tax
Tax effectTax effect(18,883)(2)— (18,883)
After-tax amounts reclassifiedAfter-tax amounts reclassified$71,035 $— $71,035 
Other comprehensive (loss) income
Other comprehensive income
Pre-tax
Pre-tax
Pre-taxPre-tax$(1,248,128)$1,179 $(1,246,949)
Tax effectTax effect264,325 — 264,325 
Other comprehensive (loss) income$(983,803)$1,179 $(982,624)
Other comprehensive income

(In thousands)(In thousands)
December 31, 2021Unrealized Investment Gains (Losses)Currency Translation AdjustmentsAccumulated Other Comprehensive Loss
(In thousands)
(In thousands)
December 31, 2022
December 31, 2022
December 31, 2022Unrealized Investment (Losses) GainsCurrency Translation AdjustmentsAccumulated Other Comprehensive Income (Loss)
Changes in AOCIChanges in AOCI
Beginning of periodBeginning of period$289,714 $(351,886)$(62,172)
Other comprehensive loss before reclassifications(222,359)(20,969)(243,328)
Beginning of period
Beginning of period
Other comprehensive (loss) income before reclassifications
Amounts reclassified from AOCIAmounts reclassified from AOCI23,547 — 23,547 
Other comprehensive loss(198,812)(20,969)(219,781)
Other comprehensive (loss) income
Other comprehensive (loss) income
Other comprehensive (loss) income
Unrealized investment loss related to non-controlling interestUnrealized investment loss related to non-controlling interest(2)— (2)
Ending balanceEnding balance$90,900 $(372,855)$(281,955)
Amounts reclassified from AOCIAmounts reclassified from AOCI
Pre-taxPre-tax$29,806 (1)$— $29,806 
Pre-tax
Pre-tax
Tax effectTax effect(6,259)(2)— (6,259)
After-tax amounts reclassifiedAfter-tax amounts reclassified$23,547 $— $23,547 
Other comprehensive loss
Other comprehensive (loss) income
Pre-tax
Pre-tax
Pre-taxPre-tax$(254,939)$(20,969)$(275,908)
Tax effectTax effect56,127 — 56,127 
Other comprehensive loss$(198,812)$(20,969)$(219,781)
Other comprehensive (loss) income
_______________
(1) Net investment gains in the consolidated statements of income.
(2) Income tax expense in the consolidated statements of income.



7374


(4)(3)    Investments in Fixed Maturity Securities
At December 31, 20222023 and 2021,2022, investments in fixed maturity securities were as follows:
(In thousands)(In thousands)Amortized
Cost		Allowance for Expected Credit Losses (1)Gross UnrealizedFair
Value		Carrying
Value
GainsLosses
December 31, 2022
(In thousands)
Gains
Gains
December 31, 2023
December 31, 2023
December 31, 2023
Held to maturity:
Held to maturity:
Held to maturity:Held to maturity:
State and municipalState and municipal$47,802 $(114)$4,239 $— $51,927 $47,688 
State and municipal
State and municipal
Residential mortgage-backed
Residential mortgage-backed
Residential mortgage-backedResidential mortgage-backed3,608 — 38 — 3,646 3,608 
Total held to maturityTotal held to maturity51,410 (114)4,277 — 55,573 51,296 
Total held to maturity
Total held to maturity
Available for sale:
Available for sale:
Available for sale:Available for sale:
U.S. government and government agencyU.S. government and government agency960,479 — 937 (69,158)892,258 892,258 
U.S. government and government agency
U.S. government and government agency
State and municipal:
State and municipal:
State and municipal:State and municipal:
Special revenue Special revenue1,837,309 — 3,662 (119,474)1,721,497 1,721,497 
Special revenue
Special revenue
State general obligation
State general obligation
State general obligation State general obligation387,709 — 2,651 (21,335)369,025 369,025 
Pre-refunded Pre-refunded156,106 — 2,741 (7)158,840 158,840 
Pre-refunded
Pre-refunded
Corporate backed
Corporate backed
Corporate backed Corporate backed210,228 — 334 (10,923)199,639 199,639 
Local general obligation Local general obligation454,983 — 2,967 (16,853)441,097 441,097 
Local general obligation
Local general obligation
Total state and municipal
Total state and municipal
Total state and municipal Total state and municipal3,046,335 — 12,355 (168,592)2,890,098 2,890,098 
Mortgage-backed securities:Mortgage-backed securities:
Mortgage-backed securities:
Mortgage-backed securities:
Residential
Residential
ResidentialResidential1,308,019 (18)395 (171,595)1,136,801 1,136,801 
CommercialCommercial547,757 — 215 (19,363)528,609 528,609 
Commercial
Commercial
Total mortgage-backed securities
Total mortgage-backed securities
Total mortgage-backed securitiesTotal mortgage-backed securities1,855,776 (18)610 (190,958)1,665,410 1,665,410 
Asset-backed securitiesAsset-backed securities4,132,365 — 2,730 (152,322)3,982,773 3,982,773 
Asset-backed securities
Asset-backed securities
Corporate:
Corporate:
Corporate:Corporate:
Industrial Industrial3,491,645 (1,704)4,439 (241,381)3,252,999 3,252,999 
Industrial
Industrial
Financial
Financial
Financial Financial2,585,247 (2,997)5,505 (117,383)2,470,372 2,470,372 
Utilities Utilities586,066 — 1,307 (36,325)551,048 551,048 
Utilities
Utilities
Other
Other
Other Other441,230 — — (11,657)429,573 429,573 
Total corporateTotal corporate7,104,188 (4,701)11,251 (406,746)6,703,992 6,703,992 
Total corporate
Total corporate
Foreign government
Foreign government
Foreign governmentForeign government1,564,930 (32,633)4,283 (135,058)1,401,522 1,401,522 
Total available for saleTotal available for sale18,664,073 (37,352)32,166 (1,122,834)17,536,053 17,536,053 
Total available for sale
Total available for sale
Total investments in fixed maturity securitiesTotal investments in fixed maturity securities$18,715,483 $(37,466)$36,443 $(1,122,834)$17,591,626 $17,587,349 
Total investments in fixed maturity securities
Total investments in fixed maturity securities

7475


(In thousands)(In thousands)Amortized
Cost		Allowance for Expected Credit Losses (1)Gross UnrealizedFair
Value		Carrying
Value		(In thousands)Amortized
Cost		Allowance for Expected Credit Losses (1)Gross UnrealizedFair
Value		Carrying
Value
GainsLossesGainsLosses
December 31, 2021
December 31, 2022
Held to maturity:Held to maturity:
Held to maturity:
Held to maturity:
State and municipal
State and municipal
State and municipalState and municipal$69,539 $(387)$10,813 $— $79,965 $69,152 
Residential mortgage-backedResidential mortgage-backed4,829 — 632 — 5,461 4,829 
Total held to maturityTotal held to maturity74,368 (387)11,445 — 85,426 73,981 
Total held to maturity
Total held to maturity
Available for sale:Available for sale:
U.S. government and government agencyU.S. government and government agency851,128 — 8,509 (4,294)855,343 855,343 
U.S. government and government agency
U.S. government and government agency
State and municipal:State and municipal:
Special revenue
Special revenue
Special revenue Special revenue2,016,382 — 62,961 (5,706)2,073,637 2,073,637 
State general obligation State general obligation388,110 — 23,152 (1,015)410,247 410,247 
Pre-refunded Pre-refunded202,633 — 14,891 (574)216,950 216,950 
Corporate backed Corporate backed166,943 — 7,191 (1,532)172,602 172,602 
Local general obligation Local general obligation401,974 — 29,455 (732)430,697 430,697 
Total state and municipal Total state and municipal3,176,042 — 137,650 (9,559)3,304,133 3,304,133 
Mortgage-backed securities:Mortgage-backed securities:
ResidentialResidential940,744 — 9,896 (11,321)939,319 939,319 
Residential
Residential
CommercialCommercial125,709 — 3,388 (341)128,756 128,756 
Total mortgage-backed securitiesTotal mortgage-backed securities1,066,453 — 13,284 (11,662)1,068,075 1,068,075 
Asset-backed securitiesAsset-backed securities4,504,950 — 4,409 (18,794)4,490,565 4,490,565 
Corporate:Corporate:
Industrial
Industrial
Industrial Industrial3,231,520 (16)62,751 (21,092)3,273,163 3,273,163 
Financial Financial1,739,282 — 30,709 (6,591)1,763,400 1,763,400 
Utilities Utilities396,242 — 13,262 (3,202)406,302 406,302 
Other Other154,210 — 125 (1,525)152,810 152,810 
Total corporateTotal corporate5,521,254 (16)106,847 (32,410)5,595,675 5,595,675 
Foreign governmentForeign government1,277,109 (22,222)7,508 (47,494)1,214,901 1,214,901 
Total available for saleTotal available for sale16,396,936 (22,238)278,207 (124,213)16,528,692 16,528,692 
Total investments in fixed maturity securitiesTotal investments in fixed maturity securities$16,471,304 $(22,625)$289,652 $(124,213)$16,614,118 $16,602,673 
——————————
(1) Represents the amount of impairment that has resulted from credit-related factors. The change in the allowance for expected credit losses is recognized in the consolidated statements of income. Amount excludes unrealized losses relating to non-credit factors.

The following table presents the rollforward of the allowance for expected credit losses for held to maturity securities for the years ended December 31, 20222023 and 2021:2022:
State and Municipal
State and MunicipalState and Municipal
(In thousands)(In thousands)20222021(In thousands)20232022
Allowance for expected credit losses, beginning of periodAllowance for expected credit losses, beginning of period$387 $798 
Change in allowance for expected credit lossesChange in allowance for expected credit losses(273)(411)
Change in allowance for expected credit losses
Change in allowance for expected credit losses
Allowance for expected credit losses, end of periodAllowance for expected credit losses, end of period$114 $387 

The following table presents the rollforward of the allowance for expected credit losses for available for sale securities for the years ended December 31, 20222023 and 2021:2022:
7576


20222021
202320232022
(In thousands)(In thousands)Foreign GovernmentCorporateMortgage- BackedTotalForeign GovernmentCorporateTotal(In thousands)Foreign GovernmentCorporateMortgage- BackedAsset-backedState and MunicipalTotalForeign GovernmentCorporateMortgage- BackedTotal
Allowance for expected credit losses, beginning of periodAllowance for expected credit losses, beginning of period$22,222 $16 $— $22,238 $1,264 $518 $1,782 
Expected credit losses on securities for which credit losses were not previously recordedExpected credit losses on securities for which credit losses were not previously recorded1,910 2,648 21 4,579 19,072 16 19,088 
Expected credit losses (gains) on securities for which credit losses were previously recorded8,534 2,042 (3)10,573 2,438 (513)1,925 
Expected credit losses on securities for which credit losses were not previously recorded
Expected credit losses on securities for which credit losses were not previously recorded
Expected credit (gains) losses on securities for which credit losses were previously recorded
Reduction due to disposalsReduction due to disposals(33)(5)— (38)(552)(5)(557)
Allowance for expected credit losses, end of periodAllowance for expected credit losses, end of period$32,633 $4,701 $18 $37,352 $22,222 $16 $22,238 
During the year ended December 31, 2022,2023, the Company increaseddecreased the allowance for expected credit losses for available for sale securities utilizing its credit loss assessment process and inputs used in its credit loss model due to an increasea reduction in unrealized losses primarily associated with foreign government securities. During the year ended December 31, 2021,2022, the Company increased the allowance for expected credit losses primarilyfor available for sale securities due to an increase in unrealized losses primarily associated with foreign government securities that had no reserve in prior periods.securities.
The amortized cost and fair value of fixed maturity securities at December 31, 2022,2023, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.
(In thousands)(In thousands)Amortized
Cost (1)		Fair Value(In thousands)Amortized
Cost (1)		Fair Value
Due in one year or lessDue in one year or less$1,570,480 $1,527,090 
Due after one year through five yearsDue after one year through five years8,746,271 8,299,945 
Due after five years through ten yearsDue after five years through ten years4,395,236 4,119,772 
Due after ten yearsDue after ten years2,143,998 1,975,763 
Mortgage-backed securitiesMortgage-backed securities1,859,384 1,669,056 
TotalTotal$18,715,369 $17,591,626 
________________
(1) Amortized cost is reduced by the allowance for expected credit losses of $114$43 thousand related to held to maturity securities.    
At December 31, 20222023 and 2021,2022, there were no investments, other than investments in United States government and government agency securities, which exceeded 10% of common stockholders’ equity. At December 31, 2022,2023, investments with a carrying value of $1,910$2,162 million were on deposit in custodial or trust accounts, of which $1,218$1,180 million was on deposit with insurance regulators, $656$921 million was on deposit in support of the Company’s underwriting activities at Lloyd’s, $31$32 million was on deposit as security for reinsurance clients and $5$29 million was on deposit as security for letters of credit issued in support of the Company’s reinsurance operations.








7677


(5)(4)    Investments in Equity Securities
At December 31, 20222023 and 2021,2022, investments in equity securities were as follows:
(In thousands)(In thousands)CostGross UnrealizedFair
Value		Carrying
Value		(In thousands)CostGross UnrealizedFair
Value		Carrying
Value
GainsLosses
December 31, 2023
December 31, 2023
December 31, 2023  
Common stocks
Preferred stocks
Total
December 31, 2022
December 31, 2022
December 31, 2022December 31, 2022        
Common stocksCommon stocks$855,987 $192,165 $(65,401)$982,751 $982,751 
Preferred stocksPreferred stocks259,341 1,053 (57,251)203,143 203,143 
TotalTotal$1,115,328 $193,218 $(122,652)$1,185,894 $1,185,894 
December 31, 2021    
Common stocks$619,896 $92,401 $(16,894)$695,403 $695,403 
Preferred stocks250,149 7,874 (12,183)245,840 245,840 
Total$870,045 $100,275 $(29,077)$941,243 $941,243 


(6)(5)    Arbitrage Trading Account
At December 31, 20222023 and 2021,2022, the fair value and carrying value of the arbitrage trading account were $944$938 million and $1,180$944 million, respectively. The primary focus of the trading account is merger arbitrage. Merger arbitrage is the business of investing in the securities of publicly held companies which are the targets in announced tender offers and mergers. Arbitrage investing differs from other types of investing in its focus on transactions and events believed likely to bring about a change in value over a relatively short time period (usually four months or less).
The Company uses put options and call options in order to mitigate the impact of potential changes in market conditions on the merger arbitrage trading account. These options are reported at fair value. As of December 31, 2022,2023, the fair value of long option contracts outstanding was $185 thousand (notional amount of $75 million) and the fair value of short option contracts outstanding was $0.1 thousand$9 million (notional amount of $10 thousand)$75 million). Other than with respect to the use of these trading account securities, the Company does not make use of derivatives.

(7)(6)    Net Investment Income
Net investment income consists of the following:
(In thousands)(In thousands)202220212020(In thousands)202320222021
Investment income (loss) earned on:Investment income (loss) earned on:   Investment income (loss) earned on:  
Fixed maturity securities, including cash and cash equivalents and loans receivableFixed maturity securities, including cash and cash equivalents and loans receivable$549,281 $382,001 $426,563 
Arbitrage trading account (1)
Equity securities
Investment fundsInvestment funds145,099 220,014 54,253 
Arbitrage trading account45,213 37,676 77,931 
Real estateReal estate(3,087)7,703 24,027 
Equity securities52,600 32,020 10,172 
Gross investment incomeGross investment income789,106 679,414 592,946 
Investment expenseInvestment expense(9,921)(7,796)(9,125)
Net investment incomeNet investment income$779,185 $671,618 $583,821 

(1) Net investment income includes earnings from trading account receivables from brokers and clearing organizations.

7778


(8)(7)    Investment Funds
The Company evaluates whether it is an investor in a variable interest entity ("VIE").  Such entities do not have sufficient equity at risk to finance their activities without additional subordinated financial support, or the equity investors, as a group, do not have the characteristics of a controlling financial interest (primary beneficiary). The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose, and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE and on an ongoing basis. The Company is not the primary beneficiary in any of its investment funds, and accordingly, carries its interests in investments funds under the equity method of accounting.
The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and its unfunded commitments of $402$339 million as of December 31, 2022.2023.
Investment funds consist of the following:
Carrying Value
as of December 31,		Income (Loss) From Investment Funds For the Year Ended
Carrying Value
as of December 31,		Carrying Value
as of December 31,		Income (Loss) From Investment Funds For the Year Ended
(In thousands)(In thousands)20222021202220212020(In thousands)20232022202320222021
Financial servicesFinancial services$465,683 $431,818 $34,030 $98,893 $34,763 
TransportationTransportation336,753 336,688 53,180 42,424 (616)
Real estateReal estate204,644 273,690 48,723 29,484 7,543 
EnergyEnergy116,432 150,224 1,425 22,118 (11,039)
InfrastructureInfrastructure115,428 12,314 4,603 1,372 1,672 
Other fundsOther funds369,608 275,878 3,138 25,723 21,930 
TotalTotal$1,608,548 $1,480,612 $145,099 $220,014 $54,253 
The Company's share of the earnings or losses of investment funds is primarily reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.
Financial services investment funds include the Company’s minority investment in Lifson Re, a Bermuda reinsurance company. Effective January 1, 2021, Lifson Re participated on a fully collateralized basis in a majority of the Company’s reinsurance placements for a 22.5% share of placed amounts. The percentage increased from 22.5% to 30.0% effective July 1, 2022. This pertains to all traditional reinsurance/retrocessional placements for both property and casualty business where there is more than one open market reinsurer participating. For the years ended December 31, 20222023 and 2021,2022, the Company ceded approximately $399$437 million and $245$399 million, respectively, of written premiums to Lifson Re.
Other funds include deferred compensation trust assets of $36 million and $30 million in 2023 and $34 million in 2022, and 2021, respectively. These assets support other liabilities reflected in the balance sheet of an equal amount for employees who have elected to defer a portion of their compensation. The change in the net asset value of the trust is recorded in other funds within net investment income with an offsetting equal amount within corporate expenses.

(9)(8)    Real Estate
Investment in real estate represents directly owned property held for investment, as follows:    
As of December 31,
As of December 31,As of December 31,
(In thousands)(In thousands)20222021(In thousands)20232022
Properties in operationProperties in operation$1,114,167 $1,626,826 
Properties under developmentProperties under development226,455 225,682 
TotalTotal$1,340,622 $1,852,508 
In 2022,2023, properties in operation included a long-term ground lease in Washington, D.C., an office complex in New York City and the completed portion of a mixed-use project in Washington D.C. Properties in operation are net of accumulated depreciation and amortization of $33,206,000$32,745,000 and $57,391,000$33,206,000 as of December 31, 20222023 and 2021,2022, respectively. Related
7879


depreciation expense was $12,269,000$8,935,000 and $19,688,000$12,269,000 for the years ended December 31, 20222023 and 2021,2022, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $32,282,796 in 2023, $33,528,105$35,757,855 in 2024, $31,015,149$35,614,848 in 2025, $29,250,535$33,617,000 in 2026, $28,334,384$32,748,310 in 2027, $33,186,534 in 2028 and $510,771,307$503,569,887 thereafter.
The Company recognized impairments on real estate of $72 million in 2023.
During the first quarter of 2022, the Company sold a real estate investment in London (proceeds from the real estate and related entity is presented on the business disposition line within the consolidated statements of cash flows).
A mixed-use project in Washington, D.C. had been under development in 20222023 and 2021,2022, with the completed portion as noted above reported in properties in operation as of December 31, 2022.2023.

(10)(9)    Loans Receivable
At December 31, 20222023 and 2021,2022, loans receivable were as follows:
As of December 31,
As of December 31,As of December 31,
(In thousands)(In thousands)20222021(In thousands)20232022
Amortized cost (net of allowance for expected credit losses):Amortized cost (net of allowance for expected credit losses):
Real estate loans
Real estate loans
Real estate loansReal estate loans$173,616 $89,431 
Commercial loansCommercial loans19,386 25,741 
TotalTotal$193,002 $115,172 
Fair value:Fair value:
Fair value:
Fair value:
Real estate loans
Real estate loans
Real estate loansReal estate loans$168,595 $90,793 
Commercial loansCommercial loans19,386 25,741 
TotalTotal$187,981 $116,534 
The real estate loans are secured by commercial and residential real estate primarily located in London and New York. These loans generally earn interest at fixed or stepped interest rates and have maturities through 2026. The commercial loans are with small business owners who have secured the related financing with the assets of the business. Commercial loans primarily earn interest on a fixed basis and have varying maturities generally not exceeding 10 years.
In 2023, the Company recognized an $18.8 million impairment on commercial loans.
Loans receivable in non-accrual status was none and $0.2 million as of December 31, 20222023 and 2021,2022, respectively.
The following table presents the rollforward of the allowance for expected credit losses for loans receivable for the years ended December 31, 20222023 and 2021:2022:
20222021
202320232022
(In thousands)(In thousands)Real Estate LoansCommercial LoansTotalReal Estate LoansCommercial LoansTotal(In thousands)Real Estate LoansCommercial LoansTotalReal Estate LoansCommercial LoansTotal
Allowance for expected credit losses, beginning of periodAllowance for expected credit losses, beginning of period$1,362 $356 $1,718 $1,683 $3,754 $5,437 
Reduction due to write-offs
Change in allowance for expected credit lossesChange in allowance for expected credit losses(262)335 73 (321)(3,398)(3,719)
Allowance for expected credit losses, end of periodAllowance for expected credit losses, end of period$1,100 $691 $1,791 $1,362 $356 $1,718 
During the year ended December 31, 2023, the Company increased the allowance for expected credit losses due to changes in economic assumptions utilized in its credit loss model.
The Company monitors the performance of its loans receivable and assesses the ability of the borrower to pay principal and interest based upon loan structure, underlying property values, cash flow and related financial and operating performance of the property and market conditions.
In evaluating the real estate loans, the Company considers their credit quality indicators, including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower’s financial condition and performance with respect to loan terms, the position in the capital structure, the overall leverage in the capital structure and other market conditions.

7980


(11)(10)    Net Investment Gains
Net investment gains were as follows:
(In thousands)(In thousands)202220212020(In thousands)202320222021
Net investment gains:Net investment gains:   Net investment gains:  
Fixed maturity securities:Fixed maturity securities:   Fixed maturity securities:  
GainsGains$4,224 $18,981 $27,819 
LossesLosses(11,654)(6,975)(56,096)
Equity securities (1):Equity securities (1):
Net realized (losses) gains on investment sales(12,879)16,365 32,647 
Change in unrealized losses(632)(38,455)(25,868)
Net realized gains (losses) on investment sales (2)
Net realized gains (losses) on investment sales (2)
Net realized gains (losses) on investment sales (2)
Change in unrealized gains (losses)
Investment fundsInvestment funds12,407 44,778 31,481 
Real estate (2)293,525 94,911 101,554 
Real estate (3) (4)
Loans receivableLoans receivable(32)(881)— 
OtherOther(67,648)(21,766)(38,023)
Net realized and unrealized gains on investments in earnings before allowance for expected credit lossesNet realized and unrealized gains on investments in earnings before allowance for expected credit losses217,311 106,958 73,514 
Change in allowance for expected credit losses on investments:Change in allowance for expected credit losses on investments:
Fixed maturity securities
Fixed maturity securities
Fixed maturity securities Fixed maturity securities(14,841)(20,045)33,134 
Loans receivable Loans receivable(73)3,719 (3,648)
Change in allowance for expected credit losses on investmentsChange in allowance for expected credit losses on investments(14,914)(16,326)29,486 
Net investment gainsNet investment gains202,397 90,632 103,000 
Income tax expenseIncome tax expense(42,670)(17,710)(21,630)
After-tax net investment gains After-tax net investment gains$159,727 $72,922 $81,370 
Change in unrealized investment (losses) gains:   
Change in unrealized investment gains (losses):Change in unrealized investment gains (losses):  
Fixed maturity securities without allowance for expected credit lossesFixed maturity securities without allowance for expected credit losses$(1,216,292)$(262,221)$134,129 
Fixed maturity securities with allowance for expected credit lossesFixed maturity securities with allowance for expected credit losses(28,370)10,124 32,004 
Investment fundsInvestment funds(2,019)(1,270)2,280 
Investment funds
Investment funds
OtherOther(1,447)(1,572)(3,768)
Total change in unrealized investment (losses) gains(1,248,128)(254,939)164,645 
Income tax benefit (expense)264,325 56,127 (24,395)
Total change in unrealized investment gains (losses)
Income tax (expense) benefit
Noncontrolling interestsNoncontrolling interests(2)(2)(2)
After-tax change in unrealized investment (losses) gains$(983,805)$(198,814)$140,248 
After-tax change in unrealized investment gains (losses)
____________________
(1) The net realized gains or losses on investment sales represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains (losses) gains consists of two components: (i) the reversal of the gain or loss recognized in previous periods on equity securities sold and (ii) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.
(2) In June 2023, the Company completed a sale of the property and casualty insurance services division of Breckenridge IS, Inc. and recognized a pre-tax net realized gain on investment of $89 million on the sale (proceeds from the sale is presented on the business disposition line within the Consolidated Statements of Cash Flows).
(3) The Company recognized impairments on real estate of $72 million in 2023.
(4) During March 2022, the Company realized a gain on the sale of a real estate investment in London, U.K. of $251 million, net of transaction expenses and the foreign currency impact, including the reversal of the currency translation adjustment.




8081


(12)(11)    Fixed Maturity Securities in an Unrealized Loss Position
The following tables summarize all fixed maturity securities in an unrealized loss position at December 31, 20222023 and 20212022 by the length of time those securities have been continuously in an unrealized loss position.
Less Than 12 Months12 Months or GreaterTotal Less Than 12 Months12 Months or GreaterTotal
(In thousands)(In thousands)Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		(In thousands)Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
December 31, 2023December 31, 2023  
U.S. government and government agency
State and municipal
Mortgage-backed securities
Asset-backed securities
Corporate
Foreign government
Fixed maturity securities
December 31, 2022
December 31, 2022
December 31, 2022December 31, 2022         
U.S. government and government agencyU.S. government and government agency$285,391 $10,219 $453,520 $58,939 $738,911 $69,158 
State and municipalState and municipal1,720,443 89,272 598,797 79,320 2,319,240 168,592 
Mortgage-backed securitiesMortgage-backed securities1,099,549 75,430 473,318 115,528 1,572,867 190,958 
Asset-backed securitiesAsset-backed securities1,569,647 48,390 2,176,638 103,932 3,746,285 152,322 
CorporateCorporate3,690,856 150,115 2,349,281 256,631 6,040,137 406,746 
Foreign governmentForeign government477,672 29,815 711,786 105,243 1,189,458 135,058 
Fixed maturity securitiesFixed maturity securities$8,843,558 $403,241 $6,763,340 $719,593 $15,606,898 $1,122,834 
December 31, 2021     
U.S. government and government agency$487,712 $4,026 $17,021 $268 $504,733 $4,294 
State and municipal502,333 7,403 29,547 2,156 531,880 9,559 
Mortgage-backed securities558,751 6,900 106,130 4,762 664,881 11,662 
Asset-backed securities3,832,944 18,503 75,385 291 3,908,329 18,794 
Corporate2,582,860 29,322 51,095 3,088 2,633,955 32,410 
Foreign government758,975 15,793 82,057 31,701 841,032 47,494 
Fixed maturity securities$8,723,575 $81,947 $361,235 $42,266 $9,084,810 $124,213 
Substantially all of the securities in an unrealized loss position are rated investment grade, except for the securities in the foreign government classification. A significant amount of the unrealized loss on foreign government securities is the result of changes in currency exchange rates.
Fixed Maturity Securities — A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at December 31, 20222023 is presented in the table below:
($ in thousands)($ in thousands)Number of
Securities		Aggregate
Fair Value		Gross
Unrealized
Loss		($ in thousands)Number of
Securities		Aggregate
Fair Value		Gross
Unrealized
Loss
Foreign governmentForeign government36 $119,332 $73,900 
State and municipal
CorporateCorporate10 39,347 4,649 
State and municipal1 12,247 2,756 
Mortgage-backed securities
Mortgage-backed securities
Mortgage-backed securitiesMortgage-backed securities14 4,464 269 
Asset-backed securitiesAsset-backed securities1 16 10 
TotalTotal62 $175,406 $81,584 
For fixed maturity securities that management does not intend to sell or to be required to sell, the portion of the decline in value that is considered to be due to credit factors is recognized in earnings, and the portion of the decline in value that is considered to be due to non-credit factors is recognized in other comprehensive income.
The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due.

8182


(13)(12)    Fair Value Measurements
The Company’s fixed maturity and equity securities classified as available for sale and its trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date”. The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:
Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.  
Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.     
Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.
Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.
If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.
For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.
8283


The following tables present the assets and liabilities measured at fair value as of December 31, 20222023 and 20212022 by level:
(In thousands)(In thousands)TotalLevel 1Level 2Level 3(In thousands)TotalLevel 1Level 2Level 3
December 31, 2022    
December 31, 2023December 31, 2023  
Assets:Assets:    Assets:  
Fixed maturity securities available for sale:Fixed maturity securities available for sale:   Fixed maturity securities available for sale:   
U.S. government and government agencyU.S. government and government agency$892,258 $— $892,258 $— 
State and municipalState and municipal2,890,098 — 2,890,098 — 
Mortgage-backed securitiesMortgage-backed securities1,665,410 — 1,665,410 — 
Asset-backed securitiesAsset-backed securities3,982,773 — 3,982,773 — 
CorporateCorporate6,703,992 — 6,703,992 
Foreign governmentForeign government1,401,522 — 1,401,522 — 
Total fixed maturity securities available for saleTotal fixed maturity securities available for sale17,536,053 — 17,536,053 — 
Equity securities:Equity securities:    Equity securities:  
Common stocksCommon stocks982,751 978,991 1,161 2,599 
Preferred stocksPreferred stocks203,143 — 191,844 11,299 
Total equity securitiesTotal equity securities1,185,894 978,991 193,005 13,898 
Arbitrage trading accountArbitrage trading account944,230 822,192 118,448 3,590 
TotalTotal$19,666,177 $1,801,183 $17,847,506 $17,488 
Total
Total
Liabilities:Liabilities:    Liabilities:  
Trading account securities sold but not yet purchasedTrading account securities sold but not yet purchased$— $— $— $— 
December 31, 2021    
December 31, 2022
December 31, 2022
December 31, 2022  
Assets:Assets:    Assets:  
Fixed maturity securities available for sale:Fixed maturity securities available for sale:   Fixed maturity securities available for sale:   
U.S. government and government agencyU.S. government and government agency$855,343 $— $855,343 $— 
State and municipalState and municipal3,304,133 — 3,304,133 — 
Mortgage-backed securitiesMortgage-backed securities1,068,075 — 1,068,075 — 
Asset-backed securitiesAsset-backed securities4,490,565 — 4,490,565 — 
CorporateCorporate5,595,675 — 5,595,675 — 
Foreign governmentForeign government1,214,901 — 1,214,901 — 
Total fixed maturity securities available for saleTotal fixed maturity securities available for sale16,528,692 — 16,528,692 — 
Equity securities:Equity securities:    Equity securities:  
Common stocksCommon stocks695,403 684,470 1,639 9,294 
Preferred stocksPreferred stocks245,840 — 234,544 11,296 
Total equity securitiesTotal equity securities941,243 684,470 236,183 20,590 
Arbitrage trading accountArbitrage trading account1,179,606 1,153,079 26,527 — 
TotalTotal$18,649,541 $1,837,549 $16,791,402 $20,590 
Liabilities:Liabilities:    Liabilities:  
Trading account securities sold but not yet purchasedTrading account securities sold but not yet purchased$1,169 $1,137 $32 $— 


8384


The following tables summarize changes in Level 3 assets and liabilities for the years ended December 31, 20222023 and 2021:2022:
Gains (Losses) Included in:Gains (Losses) Included in:
(In thousands)(In thousands)Beginning BalanceEarnings (Losses)Other Comprehensive Income (Losses)ImpairmentsPurchasesSalesPaydowns/MaturitiesTransfers In / OutEnding Balance(In thousands)Beginning BalanceEarnings (Losses)Other Comprehensive Income (Losses)ImpairmentsPurchasesSalesPaydowns/MaturitiesTransfers In / OutEnding Balance
Year ended December 31, 2022        
Year ended December 31, 2023Year ended December 31, 2023     
Assets:Assets:
Fixed maturity securities available for sale:
Fixed maturity securities available for sale:
Fixed maturity securities available for sale:Fixed maturity securities available for sale:             
CorporateCorporate$— $— $— $— $— $— $— $— $— 
Corporate
Corporate
TotalTotal— — — — — — — — — 
Equity securities:Equity securities:
Common stocks
Common stocks
Common stocksCommon stocks9,294 (6,695)— — — — — — 2,599 
Preferred stocksPreferred stocks11,296 3 — — 925 (925)— — 11,299 
TotalTotal20,590 (6,692)— — 925 (925)— — 13,898 
Arbitrage trading accountArbitrage trading account— (179)— — 4,685 (917)— 1 3,590 
TotalTotal$20,590 $(6,871)$— $— $5,610 $(1,842)$— $1 $17,488 
Liabilities:Liabilities:
Trading account securities sold but not yet purchasedTrading account securities sold but not yet purchased$— $— $— $— $— $— $— $— $— 
Trading account securities sold but not yet purchased
Trading account securities sold but not yet purchased
Year ended December 31, 2021        
Year ended December 31, 2022
Year ended December 31, 2022
Year ended December 31, 2022     
Assets:Assets:
Fixed maturity securities available for sale:
Fixed maturity securities available for sale:
Fixed maturity securities available for sale:Fixed maturity securities available for sale:             
CorporateCorporate$1,000 $— $— $— $— $(1,000)$— $— $— 
Corporate
Corporate
TotalTotal1,000 — — — — (1,000)— — — 
Equity securities:Equity securities:
Common stocks
Common stocks
Common stocksCommon stocks9,215 640 — — — (561)— — 9,294 
Preferred stocksPreferred stocks9,331 (35)— — 2,000 — — — 11,296 
TotalTotal18,546 605 — — 2,000 (561)— — 20,590 
Arbitrage trading accountArbitrage trading account— 8 — — — (8)— — — 
TotalTotal$19,546 $613 $— $— $2,000 $(1,569)$— $— $20,590 
Liabilities:Liabilities:
Trading account securities sold but not yet purchasedTrading account securities sold but not yet purchased$— $1 $— $— $(1)$— $— $— $— 
Trading account securities sold but not yet purchased
Trading account securities sold but not yet purchased
For the yearsyear ended December 31, 2023, an equity security, which no longer had a publicly traded price, was transferred into Level 3. For the year ended December 31, 2022, and 2021, there were no fixed maturity securitysecurities transferred into or out of Level 3.


8485


(14)(13) Reserves for Losses and Loss Expenses
The Company's reserves for losses and loss expenses are comprised of case reserves and incurred but not reported liabilities (IBNR). When a claim is reported, a case reserve is established for the estimated ultimate payment based upon known information about the claim. As more information about the claim becomes available over time, case reserves are adjusted up or down as appropriate. Reserves are also established on an aggregate basis to provide for IBNR liabilities and expected loss reserve development on reported claims.
Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each business. These methods may include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each business.
The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in claims handling procedures, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions.
The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is priced and written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each business. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns.
Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.
Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile,auto, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of businesses with short reporting lags than for lines of business with long reporting lags.
The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed.
A claim may be defined as an event, as a claimant (number of parties claiming damages from an event) or by exposure type (e.g., an event may give rise to two parties, each claiming loss for bodily injury and property damage).
8586


The most commonly used claim count method is by event. Most of the Company's businesses use the number of events to define and quantify the number of claims. However, in certain lines of business, where it is common for multiple parties to claim damages arising from a single event, a business may quantify claims on the basis of the number of separate parties involved in an event. This may be the case with businesses writing substantial automobileauto or transportation exposure.
Claim counts for assumed reinsurance will vary based on whether the business is written on a facultative or treaty basis. Further variability as respects treaty claim counts may be reflective of the nature of the treaty, line of business coverage, and type of participation such as quota share or excess of loss contracts. Accordingly, the claim counts have been excluded from the below Reinsurance & Monoline Excess segment tables due to this variability.
The claim count information set forth in the tables presented below may not provide an accurate reflection of ultimate loss payouts by product line.
The following tables present undiscounted incurred and paid claims development as of December 31, 2022,2023, net of reinsurance, as well as cumulative claim frequency and the total of incurred but not reported liabilities (IBNR). The information about incurred and paid claims development for the years ended December 31, 20132014 to 20212022 is presented as supplementary information. To enhance the comparability of the loss development data, the Company has removed the impact of foreign exchange rate movements by using the December 31, 20222023 exchange rate for all periods.
8687


Insurance
Other Liability
(In thousands)
Loss and Loss Expenses Incurred, Net of ReinsuranceLoss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2022Loss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2023
For the Year Ended December 31,For the Year Ended December 31,
UnauditedIBNRCumulative Number of Reported Claims
Unaudited
Unaudited
UnauditedIBNRCumulative Number of Reported Claims
Accident YearAccident Year2013201420152016201720182019202020212022IBNRCumulative Number of Reported Claims
2013$749,261 $788,581 $779,908 $779,706 $800,593 $806,914 $801,689 $805,915 $807,998 $809,358 
2014
2014
20142014844,832 845,564 843,501 848,138 861,313 867,400 862,749 861,382 862,630 35,808 28$846,005 $847,308 $845,254 $849,657 $862,568 $868,639 $863,890 $862,440 $863,636 $863,342 $$28,447 2828
20152015948,389 984,262 958,734 961,761 964,301 974,345 981,071 1,010,796 55,430 272015949,853 985,529 985,529 960,136 960,136 963,237 963,237 965,497 965,497 975,534 975,534 982,145 982,145 1,011,753 1,011,753 1,018,418 1,018,418 42,923 42,923 2828
201620161,016,106 1,009,051 1,018,253 1,029,821 1,043,948 1,059,897 1,091,569 96,310 2820161,017,074 1,010,016 1,010,016 1,019,067 1,019,067 1,030,490 1,030,490 1,044,563 1,044,563 1,060,478 1,060,478 1,092,036 1,092,036 1,134,162 1,134,162 80,989 80,989 2828
201720171,065,550 1,099,396 1,121,833 1,138,785 1,178,604 1,249,129 142,974 2820171,065,837 1,099,566 1,099,566 1,121,979 1,121,979 1,138,821 1,138,821 1,178,596 1,178,596 1,249,086 1,249,086 1,267,359 1,267,359 95,118 95,118 2828
201820181,103,900 1,131,549 1,121,317 1,156,157 1,232,803 181,880 2720181,104,011 1,131,672 1,131,672 1,121,429 1,121,429 1,156,233 1,156,233 1,232,803 1,232,803 1,299,691 1,299,691 141,108 141,108 2828
201920191,240,560 1,237,336 1,237,824 1,294,681 292,625 2820191,240,667 1,237,516 1,237,516 1,237,950 1,237,950 1,294,768 1,294,768 1,371,217 1,371,217 205,380 205,380 2929
202020201,339,565 1,212,790 1,158,880 489,718 2220201,339,702 1,212,875 1,212,875 1,158,966 1,158,966 1,167,753 1,167,753 317,212 317,212 2323
202120211,534,580 1,390,790 841,854 2320211,534,634 1,390,800 1,390,800 1,347,336 1,347,336 537,640 537,640 2525
202220221,823,680 1,507,284 2020221,823,703 1,830,125 1,830,125 1,116,619 1,116,619 2525
202320232,120,365 1,815,051 19
TotalTotal$11,924,316 
Cumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022
2013$63,243 $188,023 $330,127 $470,566 $585,608 $646,257 $691,495 $717,908 $738,858 $761,461 
Accident Year
Accident Year2014201520162017201820192020202120222023
2014201478,705 190,419 337,426 478,924 592,828 678,490 728,718 758,098 781,533 
2015201582,638 210,151 381,328 536,855 674,665 755,641 814,191 872,657 
2016201669,407 208,828 389,862 557,998 676,735 766,515 870,981 
2017201779,887 255,603 453,097 638,934 774,738 930,630 
2018201886,798 264,299 435,729 615,753 806,869 
2019201988,195 275,343 471,239 704,928 
2020202072,232 225,068 423,283 
2021202176,612 267,685 
2022202293,519 
2023
TotalTotal$6,513,546 
Reserves for loss and loss adjustment expenses before 2013, net of reinsurance125,357 
Reserves for loss and loss adjustment expenses, net of reinsurance$5,536,127 
Reserves for loss and loss adjustment expenses before 2014, net of reinsurance
Reserves for loss and loss adjustment expenses, net of reinsurance
8788



Workers' Compensation
(In thousands)
Loss and Loss Expenses Incurred, Net of ReinsuranceLoss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2022Loss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2023
For the Year Ended December 31,For the Year Ended December 31,
UnauditedIBNRCumulative Number of Reported Claims
Unaudited
Unaudited
UnauditedIBNRCumulative Number of Reported Claims
Accident YearAccident Year2013201420152016201720182019202020212022IBNRCumulative Number of Reported Claims
2013$552,570 $547,295 $546,995 $543,238 $547,000 $542,274 $541,926 $540,322 $538,503 $534,948 
2014
2014
20142014639,436 637,307 627,767 617,242 615,435 604,030 600,194 602,000 598,977 21,528 57$639,436 $637,307 $627,767 $617,242 $615,435 $604,030 $600,194 $602,000 $598,977 $589,283 $$12,555 5757
20152015712,800 690,525 650,997 641,169 626,432 620,741 617,478 612,687 29,213 582015712,800 690,525 690,525 650,997 650,997 641,169 641,169 626,432 626,432 620,741 620,741 617,478 617,478 612,687 612,687 603,732 603,732 18,013 18,013 5858
20162016702,716 696,339 684,700 660,520 651,278 657,972 654,385 36,834 582016702,716 696,339 696,339 684,700 684,700 660,520 660,520 651,278 651,278 657,972 657,972 654,385 654,385 641,549 641,549 19,823 19,823 5858
20172017762,093 733,505 689,622 673,216 683,880 682,153 41,944 582017762,093 733,505 733,505 689,622 689,622 673,216 673,216 683,880 683,880 682,153 682,153 675,871 675,871 22,933 22,933 5858
20182018778,964 724,697 715,055 724,056 721,170 43,766 562018778,964 724,697 724,697 715,055 715,055 724,056 724,056 721,170 721,170 715,018 715,018 27,179 27,179 5656
20192019784,281 721,018 732,762 734,034 67,254 542019784,281 721,018 721,018 732,762 732,762 734,034 734,034 722,456 722,456 39,081 39,081 5454
20202020725,245 716,430 704,008 96,322 422020725,245 716,430 716,430 704,008 704,008 668,222 668,222 36,045 36,045 4242
20212021742,687 701,703 149,447 452021742,687 701,703 701,703 667,517 667,517 67,127 67,127 4646
20222022772,620 348,348 412022772,620 745,218 745,218 153,476 153,476 4646
20232023784,906 352,511 43
TotalTotal$6,716,685 
Cumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022
2013$117,900 $277,538 $363,028 $414,160 $447,894 $466,580 $479,104 $489,075 $496,809 $502,181 
Accident Year
Accident Year2014201520162017201820192020202120222023
20142014148,405 319,743 412,611 471,235 503,915 521,141 531,475 538,914 547,894 
20152015139,320 323,744 421,734 477,541 512,933 531,512 544,849 557,215 
20162016142,998 338,835 446,072 504,850 537,861 558,934 572,669 
20172017153,456 362,299 468,817 525,753 559,198 583,258 
20182018171,006 397,464 508,546 574,889 613,675 
20192019184,715 397,376 515,914 581,003 
20202020172,478 380,454 485,203 
20212021172,729 384,867 
20222022180,982 
2023
TotalTotal$5,008,947 
Reserves for loss and loss adjustment expenses before 2013, net of reinsurance214,233 
Reserves for loss and loss adjustment expenses, net of reinsurance$1,921,971 
Reserves for loss and loss adjustment expenses before 2014, net of reinsurance
Reserves for loss and loss adjustment expenses, net of reinsurance

8889



Professional Liability
(In thousands)
Loss and Loss Expenses Incurred, Net of ReinsuranceLoss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2022Loss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2023
For the Year Ended December 31,For the Year Ended December 31,
UnauditedIBNRCumulative Number of Reported Claims
Unaudited
Unaudited
UnauditedIBNRCumulative Number of Reported Claims
Accident YearAccident Year2013201420152016201720182019202020212022IBNRCumulative Number of Reported Claims
2013$265,061 $244,556 $241,046 $246,943 $267,978 $276,566 $281,888 $279,824 $279,870 $283,216 
2014
2014
20142014250,740 244,574 257,309 241,376 236,961 255,850 254,868 254,243 253,244 12,284 7$252,473 $245,854 $258,874 $242,903 $238,388 $257,205 $256,157 $255,527 $254,514 $256,527 $$10,067 77
20152015257,946 256,595 272,899 274,546 290,141 281,718 282,065 286,271 19,949 82015259,122 257,634 257,634 274,233 274,233 275,604 275,604 291,157 291,157 282,452 282,452 282,806 282,806 286,950 286,950 286,320 286,320 13,275 13,275 88
20162016309,417 323,222 360,110 400,799 438,065 467,545 463,102 33,241 92016310,140 324,043 324,043 360,778 360,778 401,569 401,569 438,761 438,761 468,154 468,154 463,625 463,625 449,678 449,678 15,850 15,850 99
20172017333,267 332,400 338,723 377,410 384,416 393,409 53,786 102017333,255 332,317 332,317 338,526 338,526 377,209 377,209 384,107 384,107 393,054 393,054 401,661 401,661 45,095 45,095 1010
20182018334,848 322,176 333,408 359,566 382,409 73,828 102018335,128 322,297 322,297 333,413 333,413 359,493 359,493 382,239 382,239 397,593 397,593 81,991 81,991 1010
20192019336,129 332,385 345,614 354,283 93,387 112019336,397 332,426 332,426 345,548 345,548 354,121 354,121 362,983 362,983 89,944 89,944 1111
20202020394,107 375,577 337,961 159,767 112020394,304 375,559 375,559 337,796 337,796 313,386 313,386 100,150 100,150 1111
20212021524,879 471,266 315,877 112021525,389 471,456 471,456 446,596 446,596 215,820 215,820 1111
20222022648,941 543,483 102022649,725 586,327 586,327 405,848 405,848 1111
20232023648,231 509,380 12
TotalTotal$3,874,102 
Cumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022
2013$23,295 $63,503 $118,767 $176,079 $204,955 $246,616 $255,863 $261,106 $267,776 $273,094 
Accident Year
Accident Year2014201520162017201820192020202120222023
2014201419,225 83,063 137,341 174,524 197,272 213,888 225,236 234,459 237,145 
2015201520,331 85,047 139,205 186,688 215,408 232,143 239,150 246,031 
2016201628,517 102,173 201,019 254,872 296,863 356,812 404,742 
2017201736,503 96,312 162,829 243,088 261,225 306,713 
2018201828,101 99,598 155,212 198,697 244,284 
2019201931,674 97,466 147,985 200,521 
2020202028,106 80,408 129,168 
2021202128,586 86,056 
2022202233,446 
2023
TotalTotal$2,161,200 
Reserves for loss and loss adjustment expenses before 2013, net of reinsurance36,484 
Reserves for loss and loss adjustment expenses, net of reinsurance$1,749,386 
Reserves for loss and loss adjustment expenses before 2014, net of reinsurance
Reserves for loss and loss adjustment expenses, net of reinsurance
8990



Commercial AutomobileAuto
(In thousands)
Loss and Loss Expenses Incurred, Net of ReinsuranceLoss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2022Loss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2023
For the Year Ended December 31,For the Year Ended December 31,
UnauditedIBNRCumulative Number of Reported Claims
Unaudited
Unaudited
UnauditedIBNRCumulative Number of Reported Claims
Accident YearAccident Year2013201420152016201720182019202020212022IBNRCumulative Number of Reported Claims
2013$327,514 $349,136 $368,894 $376,243 $366,646 $366,166 $365,275 $364,207 $364,439 $364,607 
2014
2014
20142014363,891 385,241 416,802 414,732 412,120 411,920 407,470 406,589 407,970 403 47$363,882 $385,214 $417,539 $415,490 $412,929 $412,757 $408,304 $407,435 $408,816 $408,743 $$291 4747
20152015389,577 415,446 421,522 429,608 430,557 428,981 426,107 427,923 1,362 532015389,529 416,251 416,251 422,344 422,344 430,503 430,503 431,514 431,514 429,950 429,950 427,079 427,079 428,898 428,898 428,339 428,339 1,013 1,013 5353
20162016429,329 429,074 440,334 441,408 438,192 437,884 439,682 2,244 522016430,132 429,762 429,762 441,051 441,051 442,122 442,122 438,917 438,917 438,616 438,616 440,412 440,412 442,164 442,164 2,410 2,410 5252
20172017430,440 428,419 430,198 434,170 439,991 444,472 4,800 472017430,445 428,420 428,420 430,205 430,205 434,186 434,186 440,004 440,004 444,483 444,483 445,263 445,263 3,148 3,148 4747
20182018442,610 462,544 478,966 494,315 521,667 10,720 462018442,701 462,657 462,657 479,085 479,085 494,442 494,442 521,794 521,794 530,374 530,374 6,234 6,234 4545
20192019483,019 488,291 504,813 530,876 22,483 452019483,120 488,379 488,379 504,901 504,901 530,967 530,967 548,688 548,688 11,878 11,878 4545
20202020523,736 428,759 442,163 31,172 302020523,739 428,761 428,761 442,165 442,165 469,184 469,184 16,227 16,227 3030
20212021614,422 596,810 111,412 382021614,422 596,810 596,810 632,918 632,918 54,629 54,629 3838
20222022792,553 342,905 402022792,553 825,359 825,359 192,025 192,025 4444
20232023916,722 444,715 40
TotalTotal$4,968,723 
Cumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022
2013$142,929 $218,596 $267,253 $321,855 $342,961 $352,792 $361,499 $362,252 $362,624 $364,147 
Accident Year
Accident Year2014201520162017201820192020202120222023
20142014155,564 237,648 326,854 364,054 392,658 400,577 403,273 404,259 405,004 
20152015159,987 263,663 323,429 368,448 396,018 409,426 415,170 418,993 
20162016183,160 277,665 339,657 388,554 407,989 418,499 426,955 
20172017180,545 267,326 326,861 371,761 401,844 419,545 
20182018180,056 281,475 350,110 412,874 463,117 
20192019185,236 290,124 374,479 440,378 
20202020142,815 228,357 308,451 
20212021180,860 319,941 
20222022253,206 
2023
TotalTotal$3,819,737 
Reserves for loss and loss adjustment expenses before 2013, net of reinsurance3,731 
Reserves for loss and loss adjustment expenses, net of reinsurance$1,152,717 
Reserves for loss and loss adjustment expenses before 2014, net of reinsurance
Reserves for loss and loss adjustment expenses, net of reinsurance
9091



Short-tail lines
(In thousands)
Loss and Loss Expenses Incurred, Net of ReinsuranceLoss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2022Loss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2023
For the Year Ended December 31,For the Year Ended December 31,
UnauditedIBNRCumulative Number of Reported Claims
Unaudited
Unaudited
UnauditedIBNRCumulative Number of Reported Claims
Accident YearAccident Year2013201420152016201720182019202020212022IBNRCumulative Number of Reported Claims
2013$565,391 $573,905 $565,810 $549,518 $548,169 $544,681 $542,863 $542,148 $541,857 $541,728 
2014
2014
20142014691,971 697,845 659,563 658,252 659,230 659,568 662,012 660,250 658,557 1,549 30$697,102 $701,133 $658,437 $656,704 $657,637 $657,968 $660,388 $658,600 $656,931 $656,326 $$1,483 3030
20152015736,523 726,287 723,206 721,789 713,899 712,361 710,663 710,978 3,842 322015737,494 725,927 725,927 722,556 722,556 721,082 721,082 713,225 713,225 711,665 711,665 709,937 709,937 710,266 710,266 714,974 714,974 2,044 2,044 3232
20162016771,390 775,308 762,460 757,009 751,530 753,952 752,604 3,363 342016771,829 775,358 775,358 762,449 762,449 757,010 757,010 751,510 751,510 753,926 753,926 752,541 752,541 752,960 752,960 3,288 3,288 3434
20172017752,727 753,326 747,630 747,003 746,603 747,869 8,195 422017752,865 753,274 753,274 747,521 747,521 746,878 746,878 746,475 746,475 747,710 747,710 746,406 746,406 4,267 4,267 4242
20182018759,634 748,931 746,265 744,544 742,289 11,491 482018759,748 748,859 748,859 746,183 746,183 744,467 744,467 742,212 742,212 741,264 741,264 7,835 7,835 4848
20192019721,073 701,241 691,015 684,708 18,311 432019721,072 701,168 701,168 690,928 690,928 684,606 684,606 684,707 684,707 14,592 14,592 4343
20202020900,683 904,580 922,333 24,934 382020900,816 904,545 904,545 922,258 922,258 926,379 926,379 7,624 7,624 3838
20212021828,187 832,183 57,246 362021828,347 832,240 832,240 815,228 815,228 24,478 24,478 3636
20222022944,842 235,121 322022945,041 928,562 928,562 54,776 54,776 3636
202320231,075,325 286,870 27
TotalTotal$7,538,091 
Cumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022
2013$310,750 $480,140 $526,031 $527,789 $534,569 $535,756 $536,416 $537,582 $538,985 $539,081 
Accident Year
Accident Year2014201520162017201820192020202120222023
20142014368,865 587,607 609,948 628,440 643,619 650,816 653,272 653,784 654,089 
20152015392,921 608,748 664,084 686,029 695,563 701,341 708,065 708,214 
20162016416,611 669,891 711,385 726,549 731,651 738,390 739,244 
20172017445,285 689,662 718,538 730,688 734,509 741,685 
20182018414,910 661,741 708,214 725,138 725,228 
20192019404,975 615,869 645,374 657,819 
20202020460,434 784,670 845,714 
20212021405,512 698,092 
20222022472,024 
2023
TotalTotal$6,781,190 
Reserves for loss and loss adjustment expenses before 2013, net of reinsurance4,727 
Reserves for loss and loss adjustment expenses, net of reinsurance$761,628 
Reserves for loss and loss adjustment expenses before 2014, net of reinsurance
Reserves for loss and loss adjustment expenses, net of reinsurance
9192



Reinsurance & Monoline Excess
Casualty
(In thousands)
Loss and Loss Expenses Incurred, Net of ReinsuranceLoss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2022Loss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2023
For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022IBNR
2013$318,365 $269,340 $272,475 $282,307 $291,105 $298,317 $302,595 $301,415 $302,672 $302,135 $12,543 
Accident Year
Accident Year2014201520162017201820192020202120222023IBNR
20142014319,454 318,904 318,443 330,382 324,693 324,150 335,883 336,990 341,649 16,184 
20152015259,019 231,430 230,085 252,277 293,094 303,261 304,805 309,317 19,728 
20162016240,655 252,638 245,268 267,850 301,663 301,355 310,451 24,928 
20172017231,082 220,699 238,883 261,482 281,254 298,486 36,491 
20182018221,193 210,397 230,790 246,898 261,148 44,474 
20192019236,318 230,460 239,131 240,848 72,504 
20202020299,602 293,345 289,878 136,865 
20212021359,952 346,736 243,222 
20222022446,676 402,204 
2023
TotalTotal$3,147,324 
Cumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022
2013$28,945 $63,745 $108,852 $144,331 $178,060 $205,553 $225,882 $241,573 $254,273 $263,467 
Accident Year
Accident Year2014201520162017201820192020202120222023
2014201421,297 68,374 115,779 155,070 197,996 227,448 252,155 271,512 284,360 
2015201517,888 48,442 91,140 141,254 178,521 205,289 233,643 250,880 
2016201619,904 61,770 100,200 140,299 171,719 205,354 225,077 
2017201716,469 40,085 69,350 123,614 147,311 175,059 
2018201811,076 40,953 77,498 109,474 141,553 
2019201914,560 39,091 64,020 94,856 
2020202020,750 49,664 81,789 
2021202110,918 43,838 
2022202211,595 
2023
TotalTotal$1,572,474 
Reserves for loss and loss adjustment expenses before 2013, net of reinsurance417,861 
Reserves for loss and loss adjustment expenses, net of reinsurance$1,992,711 
Reserves for loss and loss adjustment expenses before 2014, net of reinsurance
Reserves for loss and loss adjustment expenses, net of reinsurance



9293


Monoline Excess
(In thousands)
Loss and Loss Expenses Incurred, Net of ReinsuranceLoss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2022Loss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2023
For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022IBNR
2013$63,995 $50,355 $48,143 $44,162 $40,207 $35,120 $31,752 $29,758 $25,701 $23,306 $5,184 
Accident Year
Accident Year2014201520162017201820192020202120222023IBNR
2014201463,561 57,650 49,570 45,823 41,671 42,541 42,618 40,652 35,707 7,484 
2015201569,977 57,897 50,099 45,115 39,682 39,781 36,774 30,104 8,683 
2016201672,657 70,281 71,404 64,957 65,485 65,222 61,432 13,634 
2017201776,701 80,508 70,749 71,025 66,795 62,647 16,529 
2018201877,820 72,505 71,448 66,180 57,847 20,826 
2019201978,929 77,482 76,242 73,978 21,878 
2020202084,354 83,468 80,452 35,638 
2021202198,110 87,980 48,670 
2022202298,923 66,865 
2023
TotalTotal$612,376 
Cumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022
2013$647 $1,897 $3,588 $3,008 $3,396 $4,418 $5,349 $6,476 $8,805 $9,490 
Accident Year
Accident Year2014201520162017201820192020202120222023
20142014377 2,341 3,354 4,175 5,808 7,595 11,154 11,938 13,491 
201520152,069 2,481 3,272 4,099 4,416 5,083 5,421 6,457 
201620162,498 4,783 5,573 5,928 7,685 9,883 11,819 
201720176,282 12,810 15,356 17,327 18,375 19,275 
201820186,141 8,230 9,368 10,359 12,414 
201920196,241 10,884 12,728 15,436 
202020204,869 8,699 10,471 
202120214,586 6,026 
202220225,898 
2023
TotalTotal$110,777 
Reserves for loss and loss adjustment expenses before 2013, net of reinsurance644,712 
Reserves for loss and loss adjustment expenses, net of reinsurance$1,146,311 
Reserves for loss and loss adjustment expenses before 2014, net of reinsurance
Reserves for loss and loss adjustment expenses, net of reinsurance

9394



Property
(In thousands)
Loss and Loss Expenses Incurred, Net of ReinsuranceLoss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2022Loss and Loss Expenses Incurred, Net of ReinsuranceAs of December 31, 2023
For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022IBNR
2013$141,380 $112,616 $114,100 $111,937 $112,572 $111,890 $109,697 $107,552 $106,316 $105,711 $72 
Accident Year
Accident Year2014201520162017201820192020202120222023IBNR
20142014112,907 96,492 97,195 99,941 99,176 98,838 99,244 97,315 96,656 177 
20152015127,118 117,452 131,625 130,301 129,398 131,071 130,642 131,342 1,061 
20162016167,901 174,423 181,634 180,885 186,159 184,150 185,249 1,482 
20172017206,560 200,394 199,410 197,978 191,867 192,379 1,209 
20182018108,220 112,068 103,104 105,101 102,953 1,754 
20192019103,113 77,062 81,858 81,014 3,637 
20202020114,590 117,867 116,774 3,946 
20212021133,938 146,761 28,634 
20222022167,039 78,818 
2023
TotalTotal$1,325,878 
Cumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of ReinsuranceCumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,For the Year Ended December 31,For the Year Ended December 31,
Unaudited
Unaudited
Accident YearAccident Year2013201420152016201720182019202020212022
2013$36,577 $74,572 $92,625 $101,538 $104,323 $106,043 $107,603 $104,403 $104,388 $105,059 
Accident Year
Accident Year2014201520162017201820192020202120222023
2014201438,780 66,829 82,119 88,257 91,390 93,099 94,565 95,198 95,633 
2015201553,474 89,121 109,051 118,552 122,566 125,439 126,848 127,995 
2016201678,920 133,516 157,404 168,506 175,949 178,060 182,411 
2017201772,126 141,340 171,675 179,749 182,609 185,823 
2018201833,991 65,079 82,259 87,736 94,870 
2019201923,081 54,499 68,457 71,054 
2020202026,574 65,575 86,888 
2021202115,235 71,797 
2022202225,584 
2023
TotalTotal$1,047,114 
Reserves for loss and loss adjustment expenses before 2013, net of reinsurance1,036 
Reserves for loss and loss adjustment expenses, net of reinsurance$279,800 
Reserves for loss and loss adjustment expenses before 2014, net of reinsurance
Reserves for loss and loss adjustment expenses, net of reinsurance
9495



The reconciliation of the net incurred and paid claims development tables to the reserves for losses and loss expenses in the consolidated balance sheet is as follows:
(In thousands)December 31, 20222023
Undiscounted reserves for loss and loss expenses, net of reinsurance:
Other liability$5,536,1276,371,675 
Workers' compensation1,921,9711,812,508 
Professional liability1,749,3861,971,299 
Commercial automobileAuto1,152,7171,452,830 
Short-tail lines761,628771,268 
Other124,586151,204 
  Insurance11,246,41512,530,784 
Casualty1,992,7112,174,132 
Monoline excess1,146,3111,071,431 
Property279,800275,397 
  Reinsurance & Monoline Excess3,418,8223,520,960 
Total undiscounted reserves for loss and loss expenses, net of reinsurance$14,665,23716,051,744 
(In thousands)December 31, 20222023
Due from reinsurers on unpaid claims:
Other liability$730,029951,773 
Workers' compensation221,769189,182 
Professional liability1,019,8101,138,129 
Commercial automobileAuto67,89581,334 
Short-tail lines414,549379,621 
Other97,511127,581 
  Insurance2,551,5632,867,620 
Casualty108,390116,198 
Monoline excess35,92640,467 
Property66,46553,547 
  Reinsurance & Monoline Excess210,781210,212 
Total due from reinsurers on unpaid claims$2,762,3443,077,832 
9596


(In thousands)December 31, 20222023
Loss reserve discount:
Other liability$— 
Workers' compensation(12,491)(12,193)
Professional liability— 
Commercial automobileAuto— 
Short-tail lines— 
Other— 
  Insurance(12,491)(12,193)
Casualty(84,668)(72,503)
Monoline excess(319,199)(305,228)
Property— 
  Reinsurance & Monoline Excess(403,867)(377,731)
Total loss reserve discount$(416,358)(389,924)
Total gross reserves for loss and loss expenses$17,011,22318,739,652 
The following is supplementary information regarding average historical claims duration as of December 31, 2022:2023:
InsuranceInsurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of ReinsuranceAverage Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years
Years
YearsYears1234567891012345678910
Other liabilityOther liability6.9 %13.7 %16.3 %16.0 %13.1 %9.2 %6.7 %4.2 %2.7 %2.8 %Other liability6.4 %13.4 %15.8 %15.6 %12.9 %10.4 %7.5 %5.5 %4.1 %3.3 %
Workers' compensationWorkers' compensation23.5 %29.9 %15.7 %9.1 %5.5 %3.2 %2.1 %1.7 %1.5 %1.0 %Workers' compensation24.4 %30.6 %16.0 %9.2 %5.3 %3.4 %2.3 %1.7 %1.4 %1.0 %
Professional liabilityProfessional liability7.4 %17.6 %17.7 %15.7 %9.1 %10.3 %5.1 %2.6 %3.0 %1.9 %Professional liability7.3 %17.1 %17.2 %14.5 %9.0 %9.4 %5.8 %2.6 %4.0 %2.0 %
Commercial automobile36.1 %20.9 %15.5 %11.5 %6.7 %2.8 %1.6 %0.4 %0.1 %0.4 %
AutoAuto34.5 %20.6 %15.8 %11.3 %7.3 %3.6 %1.6 %0.8 %0.3 %0.3 %
Short-tail linesShort-tail lines54.7 %32.8 %5.8 %2.0 %1.0 %0.8 %0.4 %0.1 %0.2 %— %Short-tail lines54.4 %33.4 %5.5 %2.8 %1.0 %0.9 %0.5 %0.3 %0.4 %0.3 %
Reinsurance & Monoline ExcessReinsurance & Monoline Excess
Reinsurance & Monoline Excess
Reinsurance & Monoline Excess
Average Annual Percentage Payout of Incurred Claims by Age, Net of ReinsuranceAverage Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years
Years
YearsYears1234567891012345678910
CasualtyCasualty5.7 %10.9 %12.5 %13.7 %11.0 %9.3 %7.4 %5.5 %4.0 %3.0 %Casualty4.7 %10.0 %11.7 %13.9 %11.7 %10.1 %8.2 %5.6 %4.4 %3.7 %
Monoline excessMonoline excess6.1 %4.7 %3.1 %1.7 %2.6 %3.3 %4.6 %3.5 %7.2 %2.9 %Monoline excess7.2 %5.1 %3.1 %2.7 %3.4 %3.2 %4.9 %3.2 %3.1 %3.5 %
PropertyProperty30.5 %33.2 %16.1 %5.8 %3.6 %1.7 %1.6 %0.3 %0.1 %— %Property28.8 %33.5 %17.1 %5.6 %3.5 %1.6 %1.6 %0.6 %0.2 %— %










9697


The table below provides a reconciliation of the beginning and ending reserve balances:
(In thousands)(In thousands)202220212020(In thousands)202320222021
Net reserves at beginning of yearNet reserves at beginning of year$12,848,362 $11,620,393 $10,697,998 
Cumulative effect adjustment resulting from changes in accounting principles (1)— — 5,927 
Restated net reserves at beginning of period12,848,362 11,620,393 10,703,925 
Net provision for losses and loss expenses:Net provision for losses and loss expenses:
Claims occurring during the current year (2)5,774,713 4,921,191 4,432,937 
Increase in estimates for claims occurring in prior years (3)54,511 863 627 
Net provision for losses and loss expenses:
Net provision for losses and loss expenses:
Claims occurring during the current year (1)
Claims occurring during the current year (1)
Claims occurring during the current year (1)
Increase in estimates for claims occurring in prior years (2)
Loss reserve discount accretionLoss reserve discount accretion32,526 31,906 35,142 
TotalTotal5,861,750 4,953,960 4,468,706 
Net payments for claims:Net payments for claims:   Net payments for claims:  
Current yearCurrent year1,068,577 887,896 921,054 
Prior yearPrior year3,279,333 2,777,798 2,677,595 
TotalTotal4,347,910 3,665,694 3,598,649 
Foreign currency translationForeign currency translation(113,323)(60,297)46,411 
Net reserves at end of yearNet reserves at end of year14,248,879 12,848,362 11,620,393 
Ceded reserve at end of yearCeded reserve at end of year2,762,344 2,542,526 2,164,037 
Gross reserves at end of yearGross reserves at end of year$17,011,223 $15,390,888 $13,784,430 
Net change in premiums and losses occurring in prior years:Net change in premiums and losses occurring in prior years:
Increase in estimates for claims occurring in prior years (3)$(54,511)$(863)$(627)
Retrospective premium adjustments for claims occurring in prior years (4)18,106 7,510 16,807 
Net change in premiums and losses occurring in prior years:
Net change in premiums and losses occurring in prior years:
Increase in estimates for claims occurring in prior years (2)
Increase in estimates for claims occurring in prior years (2)
Increase in estimates for claims occurring in prior years (2)
Retrospective premium adjustments for claims occurring in prior years (3)
Net premium and reserve development on prior yearsNet premium and reserve development on prior years$(36,405)$6,647 $16,180 

(1)The cumulative effect adjustment resulting from changes in accounting principals relates to the allowance for expected credit losses on reinsurance recoverables that commenced on January 1, 2020 due to the adoption of ASU 2016-13. See Note 1 for more details.
(2)Claims occurring during the current year are net of loss reserve discounts of $47 million, $35 million and $21 million in 2023, 2022, and $10 million in 2022, 2021, and 2020, respectively.
(3)(2)The change in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $13 million in 2023, increased by $16 million in 2022, and decreased by $19 million in 2021, and decreased by $21 million in 2020, respectively.2021.
(4)(3)For certain retrospectively rated insurance polices and reinsurance agreements, changes in loss and loss expenses for prior years are offset by additional or return premiums.
The COVID-19 global pandemic has impacted, and may further impact, the Company’s results through its effect on claim frequency and severity. Loss cost trends have been impacted and may be further impacted by COVID-19-related claims in certain lines of business. Losses incurred from COVID-19-related claims have been offset, to a certain extent, by lower claim frequency in certain lines of our businesses; however, asloss costs. Accordingly, the economy and legal systems have reopened, the benefit of lower claim frequency has partially abated. The ultimate net impact of COVID-19 on the CompanyCompany’s reserves remains uncertain. New variants of the COVID-19 virus continue to create risks with respect to loss costs and the potential for renewed impact of the other effects of COVID-19 associated with economic conditions, inflation, and social distancing and work from home rules.
Most of the COVID-19-related claims reported to the Company to date involve certain short-tailed lines of business, including contingency and event cancellation, business interruption, and film production delay. The Company has also received COVID-19-related claims for longer-tailed casualty lines of business such as workers’ compensation and other liability; however, the estimated incurred loss impact for these reported claims are not material at this time. Given the continuing uncertainty regarding the pandemic's pervasiveness, the future impact that the pandemic may have on claim frequency and severity remains uncertain at this time.
The Company has estimated the potential COVID-19 impact to its contingency and event cancellation, workers’ compensation, and other lines of business under a number of possible scenarios; however, due to COVID-19’s continued
97


evolving impact, there remains uncertainty around the Company’s COVID-19 reserves. In addition, should the pandemic continue or worsen as a result of new COVID-19 variants or otherwise, governments in the jurisdictions where we operate may impose restrictions, including lockdowns, as well as renew their efforts to expand policy coverage terms beyond the policy’s intended coverage. Accordingly, losses arising from these actions, and the other factors described above, could exceed the Company’s reserves established for those related policies.
As of December 31, 2022,2023, the Company had recognized losses for COVID-19-related claims activity, net of reinsurance, of approximately $341$384 million, of which $290$326 million relates to the Insurance segment and $51$58 million relates to the Reinsurance & Monoline Excess segment. Such $341$384 million of COVID-19-related losses included $337$381 million of reported losses and $4$3 million of IBNR. For the year ended December 31, 2022,2023, the Company recognized current accident year losses for COVID-19-related claims activity, net of reinsurance, of approximately $5$1 million, all of which $3 million relates to the Insurance segment.
Unfavorable prior year development (net of additional and return premiums) was $19 million in 2023.
Insurance – Reserves for the Insurance segment developed unfavorably by $24 million in 2023 (net of additional and $2 million relatesreturn premiums).The unfavorable development for the segment was concentrated in the early part of the year, with reserve development being flat overall during the second half of 2023.A key driver of the unfavorable development early in 2023 was property catastrophe losses related to 2022 events which were still being adjusted and settled during the early part of 2023.In particular, losses related to U.S. winter storms which occurred during the month of December 2022 were a significant contributor to the development, as information gathering and evaluation of many of these claims were still ongoing into the new year.
In addition to the property prior year development discussed above, during 2023 the Insurance segment also experienced adverse prior year development on casualty lines of business for the 2016 through 2019 accident years, which was offset by favorable prior year development on casualty lines of business for the 2020 through 2022 accident years. The unfavorable development on the 2016 through 2019 accident years was concentrated in the general liability and commercial auto liability
98


lines of business. The development, which particularly impacted business attaching excess of primary policy limits, was driven by a larger than expected number of large losses reported. The Company believes social inflation is contributing to an increase in the frequency of large losses for these accident years. Social inflation can include higher settlement demands from plaintiffs, use of tactics such as litigation funding by the plaintiffs’ bar, negative public sentiment towards large businesses and corporations, and erosion of tort reforms, among others.
The favorable prior year development on casualty lines for the 2020 through 2022 accident years in the Insurance segment was concentrated in the professional liability, workers’ compensation, and general liability lines of business. Due to elevated uncertainty regarding incurred loss frequency and severity as a result of ongoing social inflation and the impacts of the COVID-19 pandemic, the Company set its initial loss ratios for the 2020 through 2022 accident years prudently, and largely maintained these estimates through the end of each respective accident year. The reported loss experience to date for these lines of business for the 2020 through 2022 accident years has been significantly better than was expected, and the Company has begun to react to this favorable emergence as the accident years mature beyond the age of twelve months. It should also be noted that commercial auto liability experienced adverse prior year development for the 2020 through 2022 accident years, which partially offset the favorable development discussed above; the adverse development was driven by a larger than expected number of large losses reported.
Reinsurance & Monoline Excess – Reserves for the Reinsurance & Monoline Excess segment.segment developed favorably by $5 million in 2023 (net of additional and return premiums). The overall favorable prior year development for the segment was driven mainly by favorable development in excess workers’ compensation, substantially offset by unfavorable development in the non-proportional reinsurance assumed liability and excess general liability (including umbrella) lines of business.The favorable excess workers’ compensation development was driven by continued lower claim frequency and reported losses relative to our expectations, and to favorable claim settlements.The favorable development was spread across many prior accident years.The unfavorable development for non-proportional reinsurance assumed liability and excess general liability was associated primarily with our U.S. assumed reinsurance business, and related to accounts reinsuring excess and umbrella business and construction projects.The adverse development was concentrated mainly in accident years 2017 through 2020.
Unfavorable prior year development (net of additional and return premiums) was $36 million in 2022.
Insurance – Reserves for the Insurance segment developed unfavorably by $40 million in 2022 (net of additional and return premiums). The unfavorable development in the segment primarily related to COVID-19 losses at two businesses. These businesses wrote policies providing coverage for event cancellation and film production delay which were heavily impacted by losses directly caused by the COVID-19 pandemic. Most of this COVID-19 related unfavorable development emerged during the third quarter as a result of settlements of claims at values higher than our expectations. However, the Company believes that as a result of these settlements the remaining level of uncertainty around the ultimate value of its known COVID-19 claims has been significantly reduced.
The unfavorable development mentioned above also includes favorable prior year development for the Insurance segment primarily attributable to the 2020 and 2021 accident years and unfavorable development on the 2015 through 2019 accident years. The favorable development on the 2020 and 2021 accident years was concentrated in certain casualty lines of business including general liability, professional liability, and workers’ compensation. The Company experienced lower reported claim frequency in these lines of business during 2020 and 2021 relative to historical averages, and continued to experience lower reported incurred losses relative to ourits expectations for these accident years as they developed during 2022. These trends began in 2020 and we believe were caused by the impacts of the COVID-19 pandemic, including for example, lockdowns, reduced driving/traffic and increased work from home. Due to the ongoing uncertainty regarding the ultimate impacts of the pandemic on accident years 2020 and 2021 incurred losses, the Company has beenwas cautious in reacting to these lower trends in setting and updating its loss ratio estimates for these years. As these accident years have continued to mature, the Company has continued to recognize some of the favorable reported experience in its ultimate loss estimates made during 2022.
The unfavorable development on the 2015 through 2019 accident years was concentrated in the general liability and professional liability, including medical professional, lines of business, as well as commercial auto liability. The development was driven by a larger than expected number of large losses reported. The Company believes social inflation is contributing to an increase in the frequency of large losses for these accident years. Social inflation can include higher settlement demands from plaintiffs, use of tactics such as litigation funding by the plaintiffs’ bar, negative public sentiment towards large businesses and corporations, and erosion of tort reforms, among others.
Reinsurance & Monoline Excess – Reserves for the Reinsurance & Monoline Excess segment developed favorably by $4 million in 2022 (net of additional and return premiums). The overall favorable development for the segment was driven mainly by favorable development in excess workers compensation, substantially offset by unfavorable development in the
99


professional liability and non-proportional reinsurance assumed liability lines of business. The favorable excess workers’ compensation development was spread across most prior accident years, including 2012 and prior years, and was driven by a review of the Company’s claim reporting patterns as well as a number of favorable claim settlements relative to expectations. The unfavorable professional liability and non-proportional reinsurance assumed liability development was concentrated mainly in accident years 2016 through 2018 and was associated primarily with our U.S. assumed reinsurance business and related to accounts insuring construction projects and professional liability exposures.
Favorable prior year development (net of additional and return premiums) was $7 million in 2021.
Insurance – Reserves for the Insurance segment developed favorably by $20 million in 2021 (net of additional and return premiums). The overall favorable development in 2021 was attributable to favorable development on the 2020 accident year, partially offset by adverse development on the 2016 through 2019 accident years.
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The favorable development on the 2020 accident year was largely concentrated in the commercial auto liability and other liability lines of business, including commercial multi-peril liability. During 2020 the Company achieved larger rate increases in these lines of business than were contemplated in its budget and in its initial loss ratio selections. The Company also experienced significantly lower reported claim frequency in these lines in 2020 relative to historical averages, and lower reported incurred losses relative to its expectations. We believe that the lower claim frequency and lower reported incurred losses were caused by the impacts of the COVID-19 pandemic, for example, lockdowns, reduced driving and traffic, work from home, and court closures. However, due to the uncertainty regarding the ultimate impacts of the pandemic on accident year 2020 incurred losses, the Company elected not to react to these lower reported trends during 2020. As more information became available and the 2020 accident year continued to mature, during 2021 the Company started to recognize favorable accident year 2020 development in response to the continuing favorable reported loss experience relative to its expectations.
The adverse development on the 2016 through 2019 accident years is concentrated largely in the other liability line of business, including commercial multi-peril liability, but is also seen to a lesser extent in commercial autoAuto liability. The adverse development for these accident years is driven by a higher than expected number of large losses reported, and particularly impacted the directors and officers liability, lawyers professional liability, and excess and surplus lines casualty classes of business. We also believe that increased social inflation is contributing to the increased number of large losses, for example, higher jury awards on cases which go to trial, and the corresponding higher demands from plaintiffs and higher values required to reach settlement on cases which do not go to trial.
Reinsurance & Monoline Excess – Reserves for the Reinsurance & Monoline Excess segment developed unfavorably by $13 million in 2021. The unfavorable development in the segment was driven by the non-proportional reinsurance assumed liability and other liability lines of business, related primarily to accident years 2017 through 2019, and was partially offset by favorable development in excess workers’ compensation business which was spread across many prior accident years. The unfavorable non-proportional reinsurance assumed liability and other liability development was associated with our U.S. and U.K. assumed reinsurance business, and related primarily to accounts insuring construction projects and professional liability exposures.
Favorable prior year development (net of additional and return premiums) was $16 million in 2020.
Insurance - Reserves for the Insurance segment developed favorably by $24 million in 2020 (net of additional and return premiums). Continuing the pattern seen in recent years, the overall favorable development in 2020 resulted from more significant favorable development on workers’ compensation business, which was partially offset by unfavorable development on professional liability, including excess professional liability
For workers’ compensation, the favorable development was spread across almost all prior accident years, including prior to 2011, but was most significant in accident years 2016 through 2019. The favorable workers’ compensation development reflects a continuation of the benign loss cost trends experienced during recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure). The long term trend of declining workers’ compensation frequency can be attributable to improved workplace safety. Loss severity trends were also aided by our continued investment in claims handling initiatives such as medical case management services and vendor savings through usage of preferred provider networks and pharmacy benefit managers. Reported workers’ compensation losses in 2020 continued to be below our expectations at most of our businesses, and were below the assumptions underlying our initial loss ratio picks and our previous reserve estimates for most prior accident years.
For professional liability business, unfavorable development was driven mainly by large losses reported in the directors and officers (“D&O”), lawyers professional and excess hospital professional liability lines of business. For these lines of business, we continue to see an increase in the number of large losses reported and a lengthening of the reporting “tail” beyond historical levels. We believe a contributing cause is rising social inflation in the form of, for example, higher jury awards on cases that go to trial, and the corresponding higher demands from plaintiffs and higher values required to reach settlement on cases that do not go to trial. The unfavorable development for professional liability affected mainly accident years 2016 through 2018.
Reinsurance & Monoline Excess – Reserves for the Reinsurance & Monoline Excess segment developed unfavorably by $8 million in 2020. The unfavorable development in the segment was driven by non-proportional assumed liability business written in both the U.S. and U.K., and was partially offset by favorable development on excess workers’ compensation business. The unfavorable non-proportional assumed liability development was concentrated in accident years 2014 through 2018, and related primarily to accounts insuring construction projects and professional liability exposures.
Environmental and Asbestos — To date, known environmental and asbestos claims have not had a material impact on the Company’s operations, because its subsidiaries generally did not insure large industrial companies that are subject to
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significant environmental or asbestos exposures prior to 1986 when an absolute exclusion was incorporated into standard policy language.
The Company’s net reserves for losses and loss expenses relating to asbestos and environmental claims on policies written before adoption of the absolute exclusion was $17 million and $20 million at both December 31, 2023 and 2022, and 2021.respectively. The estimation of these liabilities is subject to significantly greater than normal variation and uncertainty because it is difficult to make an actuarial estimate of these liabilities due to the absence of a generally accepted actuarial methodology for these exposures and the potential effect of significant unresolved legal matters, including coverage issues, as well as the cost of litigating the legal issues. Additionally, the determination of ultimate damages and the final allocation of such damages to financially responsible parties are highly uncertain.
Discounting — The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,267$1,352 million and $1,387$1,464 million at December 31, 20222023 and 2021,2022, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $416$390 million and $452$416 million at December 31, 20222023 and 2021,2022, respectively. At December 31, 2022,2023, discount rates by year ranged from 0.7% to 6.5%, with a weighted average discount rate of 3.4%3.5%.
Substantially all discounted workers’ compensation reserves (97% of total discounted reserves at December 31, 2022)2023) are excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment
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securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.
The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at December 31, 2022)2023), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates prescribed or permitted by the Department of Insurance of the State of Delaware.

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(15)(14)    Premiums and Reinsurance Related Information
The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. Reinsurance coverage and retentions vary depending on the line of business, location of the risk and nature of loss. The Company’s reinsurance purchases include the following: property reinsurance treaties that reduce exposure to large individual property losses and catastrophe events; casualty reinsurance treaties that reduce its exposure to large individual casualty losses, workers’ compensation catastrophe losses and casualty losses involving multiple claimants or insureds; and facultative reinsurance that reduces exposure on individual policies or risks for losses that exceed treaty reinsurance capacity. Depending on the business, the Company purchases specific additional reinsurance to supplement the above programs.
The following is a summary of reinsurance financial information:
(In thousands)(In thousands)202220212020(In thousands)202320222021
Written premiums:Written premiums:   Written premiums:  
DirectDirect$10,695,138 $9,531,050 $7,874,050 
AssumedAssumed1,213,914 1,169,084 973,597 
CededCeded(1,904,982)(1,837,267)(1,585,210)
Total net written premiumsTotal net written premiums$10,004,070 $8,862,867 $7,262,437 
Earned premiums:Earned premiums:  
Earned premiums:
Earned premiums:  
DirectDirect$10,217,891 $8,825,568 $7,489,470 
AssumedAssumed1,226,801 1,085,804 941,321 
CededCeded(1,883,263)(1,805,341)(1,499,948)
Total net earned premiumsTotal net earned premiums$9,561,429 $8,106,031 $6,930,843 
Ceded losses and loss expenses incurredCeded losses and loss expenses incurred$1,269,338 $1,236,960 $955,630 
Ceded losses and loss expenses incurred
Ceded losses and loss expenses incurred
Ceded commission earnedCeded commission earned$477,437 $449,739 $358,253 

The following table presents the rollforward of the allowance for expected credit losses for premiums and fees receivable for the years ended December 31, 20222023 and 2021:2022:
(In thousands)(In thousands)20222021(In thousands)20232022
Allowance for expected credit losses, beginning of periodAllowance for expected credit losses, beginning of period$25,218 $22,883 
Change in allowance for expected credit lossesChange in allowance for expected credit losses5,442 2,335 
Change in allowance for expected credit losses
Change in allowance for expected credit losses
Allowance for expected credit losses, end of periodAllowance for expected credit losses, end of period$30,660 $25,218 
Estimated amounts due from reinsurers are reported net of an allowance for expected credit losses of $8.4 million, $8.1 million $7.7 million and $7.8$7.7 million as of December 31, 2023, 2022 2021 and 2020,2021, respectively. The following table presents the rollforward of the allowance for expected credit losses associated with due from reinsurers for the years ended December 31, 20222023 and 2021:
(In thousands)20222021
Allowance for expected credit losses, beginning of period$7,713 $7,801 
Change in allowance for expected credit losses351 (88)
Allowance for expected credit losses, end of period$8,064 $7,713 


2022:
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(In thousands)20232022
Allowance for expected credit losses, beginning of period$8,064 $7,713 
Change in allowance for expected credit losses340 351 
Allowance for expected credit losses, end of period$8,404 $8,064 
The following table presents the amounts due from reinsurers as of December 31, 2022:2023:
(In thousands)
Lloyd’s of London$347,927402,210 
Lifson Re335,382 
Partner Re314,471 
Munich Re310,985 
Berkshire Hathaway332,034307,878 
Munich Re306,530 
Partner Re275,410 
Hannover Re Group191,264231,172 
Renaissance Re217,008 
Swiss Re189,591176,377 
Lifson Re180,724 
Renaissance Re163,973 
Everest Re155,847145,155 
Liberty Mutual96,402117,556 
Axis Capital81,53886,680 
Fairfax Financial64,300 
Korean Re59,88457,530 
Fairfax Financial55,228 
Axa Insurance46,058 
Arch Capital Group45,66354,175 
Sompo Holdings Group36,15747,520 
Axa Insurance45,680 
TOA RE37,140 
Nationwide Group32,411 
Markel Corp Group31,827 
Helvetia Holdings Group30,82331,429 
Markel CorpChubb Group30,21624,459 
Validus HoldingsMS & AD Insurance Group24,54820,144 
TOA Re22,945 
Other reinsurers less than $20,000342,275316,649 
Subtotal3,015,0373,408,138 
Residual market pools (1)180,757134,793 
Allowance for expected credit losses(8,064)(8,404)
Total$3,187,7303,534,527 
(1)Many states require licensed insurers that provide workers' compensation insurance to participate in programs that provide workers' compensation to employers that cannot procure coverage from an insurer on a voluntary basis. Insurers can fulfill this residual market obligation by participating in pools where results are shared by the participating companies. The Company acts as a servicing carrier for workers' compensation pools in certain states. As a servicing carrier, the Company writes residual market business directly and then cedes 100% of this business to the respective pool. As a servicing carrier, the Company receives fee income for its services. The Company does not retain underwriting risk, and credit risk is limited as ceded balances are jointly shared by all the pool members.
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(16)(15)    Indebtedness
Indebtedness consisted of the following as of December 31, 20222023 (the difference between the face value and the carrying value is unamortized discount and debt issuance costs):
Carrying Value
Carrying ValueCarrying Value
(In thousands)(In thousands)Interest RateFace Value20222021(In thousands)Interest RateFace Value20232022
Senior notes and other debt due on:Senior notes and other debt due on:    Senior notes and other debt due on:  
January 1, 2022 (1)8.700%$— $— $76,503 
March 15, 2022 (1)4.625%— — 349,923 
February 15, 2037
February 15, 2037
February 15, 2037February 15, 20376.250%250,000 248,446 248,336 
August 1, 2044August 1, 20444.750%350,000 346,020 345,836 
May 12, 2050May 12, 20504.000%470,000 490,721 491,478 
March 30, 2052March 30, 20523.550%400,000 394,213 394,015 
September 30, 2061September 30, 20613.150%350,000 342,945 342,761 
Subsidiary debt and other (2)Various6,478 6,478 10,564 
Subsidiary debt and other (1)
Subsidiary debt and other (1)
Subsidiary debt and other (1)
Total senior notes and other debt Total senior notes and other debt $1,826,478 $1,828,823 $2,259,416 
Subordinated debentures due on:Subordinated debentures due on:
March 30, 2058
March 30, 2058
March 30, 2058March 30, 20585.700%$185,000 $179,328 $179,166 
December 30, 2059December 30, 20595.100%300,000 291,179 290,941 
September 30, 2060September 30, 20604.250%250,000 244,523 244,378 
March 30, 2061March 30, 20614.125%300,000 293,341 293,167 
Total subordinated debenturesTotal subordinated debentures$1,035,000 $1,008,371 $1,007,652 
________________
(1) In the first quarter of 2022, the Company repaid at maturity its $77 million aggregate principal amount of 8.7% senior notes in January and its $350 million aggregate principal amount of 4.625% senior notes in March.
(2) Subsidiary debt of $6 million is due as follows: $5 million in 2024, and $2 million in 2025, partially offset by the unamortized cost of $0.8$0.6 million due to entering into the $300 million senior unsecured revolving credit facility.
On April 1, 2022, the Company entered into a senior unsecured revolving credit facility that provides for revolving, unsecured borrowings up to an aggregate of $300 million with a $50 million sublimit for letters of credit. The Company may increase the amount available under the facility to a maximum of $500 million subject to obtaining lender commitments for the increase and other customary conditions. Borrowings under the facility may be used for working capital and other general corporate purposes. All borrowings under the facility must be repaid by April 1, 2027, except that letters of credit outstanding on that date may remain outstanding until April 1, 2028 (or such later date approved by all lenders). Our ability to utilize the facility is conditioned on the satisfaction of representations, warranties and covenants that are customary for facilities of this type. As of December 31, 2022,2023, there were no borrowings outstanding under the facility.
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(17)(16)    Income Taxes
Income tax expense (benefit) consists of:
(In thousands)(In thousands)Current
Expense		Deferred (Benefit) ExpenseTotal(In thousands)Current
Expense		Deferred (Benefit) ExpenseTotal
December 31, 2023December 31, 2023  
Domestic
Foreign
Total expense (benefit)
December 31, 2022
December 31, 2022
December 31, 2022December 31, 2022     
DomesticDomestic$295,849 $(27,544)$268,305 
ForeignForeign42,890 23,532 66,422 
Total expense (benefit)Total expense (benefit)$338,739 $(4,012)$334,727 
December 31, 2021December 31, 2021   
December 31, 2021
December 31, 2021  
DomesticDomestic$239,090 $2,752 $241,842 
ForeignForeign— 10,048 10,048 
Total expenseTotal expense$239,090 $12,800 $251,890 
December 31, 2020   
Domestic$162,305 $17 $162,322 
Foreign23,375 (13,880)9,495 
Total expense (benefit)$185,680 $(13,863)$171,817 
        

Income before income taxes from domestic operations was $1,430 million, $1,240 million $1,224 million and $831$1,224 million for the years ended December 31, 2023, 2022 2021 and 2020,2021, respectively. Income (loss) before income taxes from foreign operations was $324 million, $480 million $59 million and ($126)$59 million for the years ended December 31, 2023, 2022 2021 and 2020,2021, respectively.

A reconciliation of the income tax expense and the amounts computed by applying the Federal and foreign income tax rate of 21% for 2023, 2022 2021 and 20202021 to pre-tax income are as follows:
(In thousands)(In thousands)202220212020(In thousands)202320222021
Computed “expected” tax expenseComputed “expected” tax expense$361,133 $269,410 $148,008 
Tax-exempt investment incomeTax-exempt investment income(10,815)(11,380)(12,770)
Change in valuation allowanceChange in valuation allowance(28,064)2,974 46,238 
Impact of foreign tax ratesImpact of foreign tax rates(453)(2,368)6,753 
State and local taxesState and local taxes8,976 4,230 2,561 
Other, netOther, net3,950 (10,976)(18,973)
Other, net
Other, net
Total expenseTotal expense$334,727 $251,890 $171,817 















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At December 31, 20222023 and 2021,2022, the tax effects of differences that give rise to significant portions of the deferred tax asset and deferred tax liability are as follows:
(In thousands)(In thousands)20222021(In thousands)20232022
Deferred tax asset:Deferred tax asset:  Deferred tax asset:  
Loss reserve discountingLoss reserve discounting$192,181 $162,636 
Unearned premiumsUnearned premiums180,326 163,143 
Unrealized investment lossesUnrealized investment losses228,456 — 
Net operating losses & foreign tax creditsNet operating losses & foreign tax credits58,182 88,502 
Other-than-temporary impairmentsOther-than-temporary impairments5,935 5,176 
Employee compensation plansEmployee compensation plans63,313 61,301 
OtherOther72,536 54,269 
Gross deferred tax assetGross deferred tax asset800,929 535,027 
Less valuation allowanceLess valuation allowance(47,166)(75,230)
Deferred tax assetDeferred tax asset753,763 459,797 
Deferred tax liability:Deferred tax liability:  Deferred tax liability:  
Amortization of intangiblesAmortization of intangibles13,973 12,787 
Loss reserve discounting - transition ruleLoss reserve discounting - transition rule14,843 19,796 
Deferred policy acquisition costsDeferred policy acquisition costs157,055 137,893 
Unrealized investment gains— 36,850 
Property, furniture and equipment
Property, furniture and equipment
Property, furniture and equipmentProperty, furniture and equipment45,887 43,186 
Investment fundsInvestment funds125,525 101,999 
OtherOther67,479 67,331 
Deferred tax liabilityDeferred tax liability424,762 419,842 
Net deferred tax assetNet deferred tax asset$329,001 $39,955 

The Company had a net current tax payable of $46 million and a net taxreceivable of $5 million and $3 million at December 31, 20222023 and 2021,2022, respectively. At December 31, 2022,2023, the Company had foreign net operating loss carryforwards of $4$220 million that begin to expire in 2027 and an additional $225 million that have no expiration date. At December 31, 2022,2023, the Company had a valuation allowance of $47$36 million as compared to $75$47 million at December 31, 2021.2022. The Company has provided a valuation allowance against the utilization of foreign tax credits and the future net operating loss carryforward benefits of certain foreign operations. The statute of limitations for the Company’s U.S. Federal income tax returns has closed for all years through December 31, 2018.2019.

The realization of the deferred tax asset is dependent upon the Company’s ability to generate sufficient taxable income in future periods. Based on historical results and the prospects for future current operations, management anticipates that it is more likely than not that future taxable income will be sufficient for the realization of this asset.

The Tax Cuts and Jobs Act of 2017 (the "Tax Act") provided for a reduction of the U.S. corporate income tax rate from 35% to 21% effective January 1, 2018. The U.S. tax law requires insurance reserves to be discounted for tax purposes. The Tax Act modified this computation. The IRS issued revised discount factors to be applied to the 2017 reserves, which increased the beginning of year 2018 deferred tax asset for loss reserve discounting. Under the related transition rule, a deferred tax liability was established which will be included in taxable income over the eight year period that began in 2018.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $169$261 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. In the future, if such earnings were distributed the Company projects that the incremental tax, if any, will be immaterial.
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(18)(17)    Dividends from Subsidiaries and Statutory Financial Information
The Company’s insurance subsidiaries are restricted by law as to the amount of dividends they may pay without the approval of regulatory authorities. The Company’s lead insurer, Berkley Insurance Company ("BIC"), directly or indirectly owns all of the Company’s other insurance companies. During 2023,2024, the maximum amount of dividends that can be paid by BIC without such approval is approximately $1.2 billion.
BIC’s combined net income and statutory capital and surplus, as determined in accordance with statutory accounting practices ("SAP"), are as follows:
(In thousands)(In thousands)202220212020(In thousands)202320222021
Net incomeNet income$1,358,813 $1,040,342 $771,990 
Statutory capital and surplusStatutory capital and surplus$8,330,587 $6,817,535 $6,188,121 
    The significant variances between SAP and GAAP are that for statutory purposes bonds are carried at amortized cost, unrealized gains and losses on equity securities are recorded in surplus, acquisition costs are charged to income as incurred, deferred Federal income taxes are subject to limitations, excess and assumed workers’ compensation reserves are discounted at different discount rates and certain assets designated as “non-admitted assets” are charged against surplus. The Commissioner of Insurance of the State of Delaware has allowed BIC to recognize a non-tabular discount on certain workers' compensation loss reserves, which is a permitted practice that differs from SAP. The effect of using this permitted practice was an increase to BIC’s statutory capital and surplus by $171$159 million at December 31, 20222023.
The National Association of Insurance Commissioners (“NAIC”) has risk-based capital (“RBC”) requirements that require insurance companies to calculate and report information under a risk-based formula which measures statutory capital and surplus needs based on a regulatory definition of risk in a company’s mix of products and its balance sheet. This guidance is used to calculate two capital measurements: Total Adjusted Capital and RBC Authorized Control Level. Total Adjusted Capital is equal to the Company’s statutory capital and surplus excluding capital and surplus derived from the use of permitted practices that differ from statutory accounting practices. RBC Authorized Control Level is the capital level used by regulatory authorities to determine whether remedial action is required. Generally, no remedial action is required if Total Adjusted Capital is 200% or more of the RBC Authorized Control Level. At December 31, 2022,2023, BIC’s Total Adjusted Capital of $8.2$8.6 billion was 408%391% of its RBC Authorized Control Level.
See Note 4,3, Investments in Fixed Maturity Securities, for a description of assets held on deposit as security.

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(19)(18)    Common Stockholders’ Equity
The weighted average number of shares used in the computation of net income per share was as follows:
(In thousands)(In thousands)202220212020(In thousands)202320222021
BasicBasic276,852 277,430 280,386 
DilutedDiluted279,461 279,749 283,145 

Treasury shares have been excluded from average outstanding shares from the date of acquisition. The weighted average number of basic shares outstanding includes the impact of 11,416,85611,663,450 common shares held in a grantor trust. The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since shares deliverable under vested RSUs were already included in diluted shares outstanding. The difference in calculating basic and diluted net income per share is attributable entirely to the dilutive effect of stock-based compensation plans. Changes in shares of common stock outstanding, net of treasury shares, are presented below. Shares of common stock issued and outstanding do not include shares related to unissued restricted stock units (including shares held in the grantor trust).
202220212020
2023202320222021
Balance, beginning of yearBalance, beginning of year265,170,882 266,737,725275,117,861Balance, beginning of year264,546,100 265,170,882265,170,882266,737,725
Shares issuedShares issued745,612 1,062,086 1,164,816Shares issued706,333 745,612 745,612 1,062,0861,062,086
Shares repurchasedShares repurchased(1,370,394)(2,628,929)(9,544,952)Shares repurchased(8,707,676)(1,370,394)(1,370,394)(2,628,929)(2,628,929)
Balance, end of yearBalance, end of year264,546,100 265,170,882266,737,725Balance, end of year256,544,757 264,546,100264,546,100265,170,882

The amount of dividends paid is dependent upon factors such as the receipt of dividends from our subsidiaries, our results of operations, cash flow, financial condition and business needs, the capital and surplus requirements of our subsidiaries, and applicable insurance regulations that limit the amount of dividends that may be paid by our regulated insurance subsidiaries.

(20)
(19)    Fair Value of Financial Instruments
The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments as of December 31, 20222023 and 2021:2022:
20222021 20232022
(In thousands)(In thousands)Carrying ValueFair ValueCarrying ValueFair Value(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:Assets:    Assets:  
Fixed maturity securitiesFixed maturity securities$17,587,349 $17,591,626 $16,602,673 $16,614,118 
Equity securitiesEquity securities1,185,894 1,185,894 941,243 941,243 
Arbitrage trading accountArbitrage trading account944,230 944,230 1,179,606 1,179,606 
Loans receivableLoans receivable193,002 187,981 115,172 116,534 
Cash and cash equivalentsCash and cash equivalents1,449,346 1,449,346 1,568,843 1,568,843 
Trading accounts receivable from brokers and clearing organizationsTrading accounts receivable from brokers and clearing organizations233,863 233,863 — — 
Due from brokerDue from broker3,609 3,609 20,448 20,448 
Liabilities:Liabilities:
Due to broker— — 53,636 53,636 
Liabilities:
Liabilities:
Trading account securities sold but not yet purchased
Trading account securities sold but not yet purchased
Trading account securities sold but not yet purchasedTrading account securities sold but not yet purchased— — 1,169 1,169 
Senior notes and other debtSenior notes and other debt1,828,823 1,439,188 2,259,416 2,526,630 
Subordinated debenturesSubordinated debentures1,008,371 805,600 1,007,652 1,095,600 
The estimated fair values of the Company’s fixed maturity securities, equity securities available for sale and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 1312 above. The fair value of loans receivable is estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

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(21)(20)    Commitments, Litigation and Contingent Liabilities
In the ordinary course of business, the Company is subject to disputes, litigation and arbitration arising from its insurance and reinsurance businesses. These matters are generally related to insurance and reinsurance claims and are considered in the establishment of loss and loss expense reserves. In addition, the Company may also become involved in legal actions which seek extra-contractual damages, punitive damages or penalties, including claims alleging bad faith in handling of insurance claims. The Company expects its ultimate liability with respect to such matters will not be material to its financial condition. However, adverse outcomes on such matters are possible, from time to time, and could be material to the Company’s results of operations in any particular financial reporting period.
On December 22, 2023, one of the Company’s subsidiaries filed a lawsuit against certain reinsurers to recover in excess of $90 million in respect of certain losses paid to its policyholders under certain event cancellation and related insurance policies. The Company believes its claims against the reinsurers are meritorious and expects a positive resolution to its lawsuit. Whilean adverse outcome is possible, the Company believes that the outcome, in any case, will notbe material to the Company’s financial condition.

At December 31, 2022,2023, the Company had commitments to invest up to $402$339 million and $146$106 million in certain investment funds and real estate construction projects, respectively.


(22)(21) Leases
    Lessees are required to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months on the balance sheet. All leases disclosed within this note are classified as operating leases. Recognized right-of-use asset and lease liability are reported within other assets and other liabilities, respectively, in the consolidated balance sheet. Lease expense is reported in other operating costs and expenses in the consolidated statement of income and accounted for on a straight-line basis over the lease term.
    To determine the discount rate used to calculate present value of future minimum lease payments, the Company uses its incremental borrowing rate during the lease commencement period in line with the respective lease duration. In certain cases, the Company has the option to renew the lease. Lease renewal future payments are included in the present value of the future minimum lease payments when the Company determines it is reasonably certain to renew.
    The main leases entered into by the Company are for office space used by the Company’s operating units across the world. Additionally, the Company, to a lesser extent, has equipment leases mainly for office equipment. Further information relating to operating lease expense and other operating lease information is as follows:
For the Year Ended December 31,For the Year Ended December 31,
For the Year Ended December 31,
(In thousands)(In thousands)2021
(In thousands)
(In thousands)20232022
Leases:Leases:
Lease cost
Lease cost
Lease costLease cost$43,383 $44,051 
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flowsCash paid for amounts included in the measurement of lease liabilities reported in operating cash flows$43,871 $45,592 
Right-of-use assets obtained in exchange for new lease liabilitiesRight-of-use assets obtained in exchange for new lease liabilities$28,075 $38,929 

As of December 31,
As of December 31,As of December 31,
($ in thousands)($ in thousands)20222021($ in thousands)20232022
Right-of-use assetsRight-of-use assets$169,271 $172,180 
Lease liabilitiesLease liabilities$204,088 $208,729 
Weighted-average remaining lease termWeighted-average remaining lease term7.1 years7.2 yearsWeighted-average remaining lease term7.3 years7.1 years
Weighted-average discount rateWeighted-average discount rate4.40 %4.83 %Weighted-average discount rate5.10 %4.40 %
    




108


Contractual maturities of the Company’s future minimum lease payments are as follows:
(In thousands)(In thousands)December 31, 2022
(In thousands)
(In thousands)
Contractual Maturities:Contractual Maturities:
2023$47,024 
Contractual Maturities:
Contractual Maturities:
2024
2024
2024202441,788 
2025202532,928 
2025
2025
2026
2026
2026202625,973 
2027202716,472 
2027
2027
2028
2028
2028
Thereafter
Thereafter
ThereafterThereafter68,912 
Total undiscounted future minimum lease paymentsTotal undiscounted future minimum lease payments233,097 
Total undiscounted future minimum lease payments
Total undiscounted future minimum lease payments
Less: Discount impact
Less: Discount impact
Less: Discount impactLess: Discount impact29,009 
Total lease liabilityTotal lease liability$204,088 
Total lease liability
Total lease liability


(23)(22)    Stock Incentive Plan
Pursuant to the Company's stock incentive plan, the Company may issue restricted stock units ("RSUs") to employees of the Company and its subsidiaries. The RSUs generally vest three to five years from the award date and are subject to other vesting and forfeiture provisions contained in the award agreement. The following table summarizes RSU information for the three years ended December 31, 2022:2023:
202220212020
2023202320222021
RSUs granted and unvested at beginning of period:RSUs granted and unvested at beginning of period:5,144,519 5,706,504 6,186,390 
GrantedGranted1,024,960 1,272,990 1,443,680 
VestedVested(1,258,680)(1,523,960)(1,667,382)
CanceledCanceled(292,373)(311,016)(256,184)
RSUs granted and unvested at end of period:RSUs granted and unvested at end of period:4,618,426 5,144,519 5,706,504 
    
Upon vesting, shares of the Company’s common stock equal to the number of vested RSUs are issued or deferred to a later date, depending on the terms of the specific award agreement. As of December 31, 2022, 11,403,4562023, 11,560,624 RSUs had been deferred. RSUs that have not yet vested and vested RSUs that have been deferred are not considered to be issued and outstanding shares.

The fair value of RSUs at the date of grant are recorded as unearned compensation, a component of stockholders’ equity, and expensed over the vesting period. Following is a summary of changes in unearned compensation for the three years ended December 31, 2022:2023:
(In thousands)(In thousands)202220212020(In thousands)202320222021
Unearned compensation at beginning of yearUnearned compensation at beginning of year$135,535 $132,310 $128,390 
RSUs granted, net of cancellationsRSUs granted, net of cancellations60,628 56,711 54,270 
RSUs expensed RSUs expensed(47,611)(46,441)(47,108)
RSUs forfeitures RSUs forfeitures(6,492)(7,045)(3,242)
Unearned compensation at end of yearUnearned compensation at end of year$142,060 $135,535 $132,310 

109


(24)(23)    Compensation Plans
The Company and its subsidiaries have profit sharing plans in which substantially all employees participate. The plans provide for minimum annual contributions of 5% of eligible compensation; contributions above the minimum are discretionary and vary with each participating businesses's profitability. Employees become eligible to participate in the plan on the first day of the calendar quarter following the first full calendar quarter after the employee's date of hire provided the employee has completed 250 hours of service during the calendar quarter. The plans provide that 40% of the contributions vest immediately and that the remaining 60% vest at varying percentages based upon years of service. Profit sharing expense was $75 million, $62 million and $50 million in 2023, 2022 and $48 million in 2022, 2021, and 2020, respectively.
The Company has a long-term incentive compensation plan ("LTIP") that provides for compensation to key executives based on the growth in the Company's book value per share over a five year period.
The following table summarizes the outstanding LTIP awards as of December 31, 2022:2023:
Units OutstandingMaximum ValueInception to date earned through December 31, 2022 on outstanding units
2018 grant188,500 $18,850,000 $18,850,000 
Units OutstandingUnits OutstandingMaximum ValueInception to date earned through December 31, 2023 on outstanding units
2019 grant2019 grant205,000 20,500,000 17,164,589 
2020 grant2020 grant216,000 21,600,000 13,943,707 
2021 grant2021 grant221,750 22,175,000 11,426,223 
2022 grant2022 grant241,000 24,100,000 6,232,260 
2023 grant

The following table summarizes the LTIP expense for each of the three years ended December 31, 2022:2023:
(In thousands)(In thousands)202220212020(In thousands)202320222021
2015 grant$— $— $(168)
2016 grant
2016 grant
2016 grant2016 grant— (117)3,176 
2017 grant2017 grant— 6,012 2,914 
2018 grant2018 grant4,299 5,503 2,776 
2019 grant2019 grant6,904 5,309 2,490 
2020 grant2020 grant6,653 5,065 2,276 
2021 grant2021 grant6,574 4,906 — 
2022 grant2022 grant6,232 — — 
2023 grant
TotalTotal$30,662 $26,678 $13,464 
    
(25)(24)    Supplemental Financial Statement Data
Other operating costs and expenses consist of the following:
(In thousands)(In thousands)202220212020(In thousands)202320222021
Amortization of deferred policy acquisition costsAmortization of deferred policy acquisition costs$1,038,903 $961,628 $904,955 
Insurance operating expensesInsurance operating expenses1,635,000 1,345,099 1,206,058 
Insurance service expensesInsurance service expenses96,419 86,003 85,724 
Net foreign currency (gains) losses(50,930)(25,725)363 
Net foreign currency losses (gains)
Debt extinguishment costsDebt extinguishment costs— 11,521 8,440 
Other costs and expensesOther costs and expenses242,113 220,744 184,852 
TotalTotal$2,961,505 $2,599,270 $2,390,392 

(26)(25)    Industry Segments
The Company’s reportable segments include the following two business segments, plus a corporate segment:
•Insurance - predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in Asia, Australia, Canada, Continental Europe, Mexico, Scandinavia, South America and the United Kingdom.

110

•Reinsurance & Monoline Excess - reinsurance business on a facultative and treaty basis, primarily in the United States, United Kingdom, Continental Europe, Australia, the Asia-Pacific region and South Africa, as well as operations that solely retain risk on an excess basis.
The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Income tax expense and benefits are calculated based upon the Company’s overall effective tax rate.
Summary financial information about the Company’s reporting segments is presented in the following table. Income before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.
Revenues
(In thousands)
(In thousands)
(In thousands)Earned
Premiums (1)		Investment
Income		OtherTotal (2)Pre-Tax
Income
(Loss)		Net
Income
(Loss)
to Common Stockholders
Year ended December 31, 2023Year ended December 31, 2023  
Insurance
Reinsurance & Monoline Excess
Corporate, other and eliminations (3)
Net investment gains
Consolidated
Revenues
(In thousands)Earned
Premiums (1)		Investment
Income		OtherTotal (2)Pre-Tax
Income
(Loss)		Net
Income
(Loss)
to Common Stockholders
Year ended December 31, 2022Year ended December 31, 2022      
Year ended December 31, 2022
Year ended December 31, 2022
Insurance
Insurance
InsuranceInsurance$8,369,062 $550,084 $33,347 $8,952,493 $1,455,658 $1,173,425 
Reinsurance & Monoline ExcessReinsurance & Monoline Excess1,192,367 194,272 — 1,386,639 316,527 251,386 
Corporate, other and eliminations (3)Corporate, other and eliminations (3)— 34,829 590,141 624,970 (254,901)(203,476)
Net investment gainsNet investment gains— — 202,397 202,397 202,397 159,727 
ConsolidatedConsolidated$9,561,429 $779,185 $825,885 $11,166,499 $1,719,681 $1,381,062 
Year ended December 31, 2021Year ended December 31, 2021
Year ended December 31, 2021
Year ended December 31, 2021
Insurance
Insurance
InsuranceInsurance$7,077,708 $468,821 $32,063 $7,578,592 $1,219,798 $976,184 
Reinsurance & Monoline ExcessReinsurance & Monoline Excess1,028,323 175,324 — 1,203,647 270,563 215,439 
Corporate, other and eliminations (3)Corporate, other and eliminations (3)— 27,473 555,122 582,595 (298,088)(242,055)
Net investment gainsNet investment gains— — 90,632 90,632 90,632 72,922 
ConsolidatedConsolidated$8,106,031 $671,618 $677,817 $9,455,466 $1,282,905 $1,022,490 
Year ended December 31, 2020
Insurance$6,067,669 $375,554 $35,611 $6,478,834 $668,012 $487,125 
Reinsurance & Monoline Excess863,174 146,029 — 1,009,203 205,587 164,655 
Corporate, other and eliminations (3)— 62,238 445,650 507,888 (271,797)(214,291)
Net investment gains— — 103,000 103,000 103,000 93,181 
Consolidated$6,930,843 $583,821 $584,261 $8,098,925 $704,802 $530,670 


Identifiable AssetsIdentifiable AssetsIdentifiable Assets
(In thousands)(In thousands)December 31,(In thousands)December 31,
20222021
202320232022
InsuranceInsurance$27,009,652 $24,414,305 
Reinsurance & Monoline ExcessReinsurance & Monoline Excess5,195,752 4,916,894 
Corporate, other and eliminations (3)Corporate, other and eliminations (3)1,655,695 2,755,215 
ConsolidatedConsolidated$33,861,099 $32,086,414 

(1) Certain amounts included in earned premiums of each segment are related to inter-segment transactions.
(2) Revenues for Insurance includes $1,171 million, $1,029 million, and $873 million in 2023, 2022 and $692 million in 2022, 2021, and 2020, respectively, from foreign countries. Revenues for Reinsurance & Monoline Excess includes $463 million, $412 million, and $380 million in 2023, 2022 and $292 million in 2022, 2021, and 2020, respectively, from foreign countries.
(3) Corporate, other and eliminations represent corporate revenues and expenses and other items that are not allocated to business segments.
111

business segments.

Net premiums earned by major line of business were as follows:
(In thousands)(In thousands)202220212020(In thousands)202320222021
InsuranceInsurance   Insurance 
Other liabilityOther liability$3,206,846 $2,673,098 $2,269,458 
Short-tail linesShort-tail lines1,630,371 1,389,068 1,247,908 
Auto
Workers' compensationWorkers' compensation1,197,811 1,131,283 1,127,487 
Commercial automobile1,208,241 990,945 794,171 
Professional liabilityProfessional liability1,125,793 893,314 628,645 
Total InsuranceTotal Insurance8,369,062 7,077,708 6,067,669 
Reinsurance & Monoline ExcessReinsurance & Monoline Excess
CasualtyCasualty764,793 643,193 521,559 
Casualty
Casualty
Property
Monoline ExcessMonoline Excess217,017 201,187 171,522 
Property210,557 183,943 170,093 
Total Reinsurance & Monoline ExcessTotal Reinsurance & Monoline Excess1,192,367 1,028,323 863,174 
TotalTotal$9,561,429 $8,106,031 $6,930,843 



(27)    Subsequent Event
On January 3, 2023, the Company's Board of Directors declared a special cash dividend on its common stock of 50 cents per share that was paid on January 24, 2023 to stockholders of record at the close of business on January 13, 2023.
112

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
None.

ITEM 9A. CONTROLS AND PROCEDURES

The Company's management, including its Chief Executive Officer and Chief Financial Officer, have conducted an evaluation of the effectiveness of the Company's disclosure controls and procedures pursuant to Exchange Act Rule 13a-15(b) as of the end of the period covered by this annual report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the Company has in place effective controls and procedures designed to ensure that information required to be disclosed by the Company in the reports it files or submits under the Exchange Act and the rules thereunder, is recorded, processed, summarized and reported within the time periods specified in the Commission's rules and forms.
During the quarter ended December 31, 2022,2023, there have been no changes in our internal controls over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.
Management's Report On Internal Control Over Financial Reporting

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of Treadway Commission. Based on our evaluation under the framework in Internal Control - Integrated Framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2022.2023.


113


Report of Independent Registered Public Accounting Firm
To the Stockholders and the Board of Directors
W. R. Berkley Corporation:
Opinion on Internal Control Over Financial Reporting
We have audited W. R. Berkley Corporation and subsidiaries’ (the Company) internal control over financial reporting as of December 31, 2022,2023, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2022,2023, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 20222023 and 2021,2022, the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2022,2023, and the related notes and financial statement schedules II to VI (collectively, the consolidated financial statements), and our report dated February 24, 202323, 2024 expressed an unqualified opinion on those consolidated financial statements.
Basis for Opinion
The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report On Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
Definition and Limitations of Internal Control Over Financial Reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/S/ KPMG LLP

New York, New York
February 24, 202323, 2024
114

ITEM 9B. OTHER INFORMATION
    
    None.


ITEM 9C. DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

Not applicable.
115

PART III
ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, and which is incorporated herein by reference.

ITEM 11. EXECUTIVE COMPENSATION

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, and which is incorporated herein by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

(a) Security ownership of certain beneficial owners

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, and which is incorporated herein by reference.

(b) Security ownership of management

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, and which is incorporated herein by reference.

(c) Changes in control

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, and which is incorporated herein by reference.

(d) Equity compensation plan information

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, and which is incorporated herein by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, and which is incorporated herein by reference.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES
Our independent registered public accounting firm is KPMG LLP, New York, NY, Auditor Firm ID: 185.
Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2022,2023, and which is incorporated herein by reference.
116

PART IV
ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
(a) Index to Financial Statements
The schedules to the consolidated financial statements listed below should be read in conjunction with the consolidated financial statements included in this Annual Report on Form 10-K. Financial statement schedules not included in this Annual Report on Form 10-K have been omitted because they are not applicable or required information is shown in the financial statements or notes thereto.
Index to Financial Statement SchedulesPage
124123
128127
129128
130129
131130

117

(b) Exhibits
EXHIBITS
Number 
(3.1)
The Company’s Restated Certificate of Incorporation, as amended through May 10, 2004 (incorporated by reference to Exhibits 3.1 and 3.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 6, 2003).
(3.2)
Amendment, dated May 11, 2004, to the Company’s Restated Certificate of Incorporation, as amended (incorporated by reference to Exhibit 3.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 5, 2004).
(3.3)
Amendment, dated May 16, 2006, to the Company’s Restated Certificate of Incorporation, as amended (incorporated by reference to Exhibit 3.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on May 17, 2006).
(3.4)
Amendment, dated June 12, 2020, to the Company’s Restated Certificate of Incorporation, as amended (incorporated by reference to Exhibit 3.1 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on June 16, 2020).
Amendment, dated June 15, 2022, to the Company’s Restated Certificate of Incorporation, as amended (incorporated by reference to Exhibit 3.1 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on June 16, 2022).
(3.6)
Amended and Restated By-Laws of the Company (incorporated by reference to Exhibit 3 (ii)3.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on August 5, 2015)March 1, 2023).
(4.1)
Description of Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934.1934 (incorporated by reference to Exhibit 4.1 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on February 24, 2023).
(4.2)
Indenture, dated as of February 14, 2003, between the Company and The Bank of New York, as Trustee (incorporated by reference to Exhibit 4.1 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on March 31, 2003).
(4.3)
Fifth Supplemental Indenture, dated as of February 9, 2007, between the Company and The Bank of New York, as Trustee, relating to $250,000,000 principal amount of the Company’s 6.250% Senior Notes due 2037, including the form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.7 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on March 1, 2007).
(4.4)
Ninth Supplemental Indenture, dated as of August 6, 2014, between the Company and The Bank of New York Mellon, as Trustee, relating to $350,000,000 principal amount of the Company’s 4.750% Senior Notes due 2044, including the form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on August 6, 2014).
(4.5)
Indenture, dated as of May 12, 2020, between the Company and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on May 12, 2020).
(4.6)
First Supplemental Indenture, dated as of May 12, 2020, between the Company and The Bank of New York Mellon, as Trustee, relating to $470,000,000 principal amount of the Company’s 4.000% Senior Notes due 2050, including the form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on May 12, 2020).
Second Supplemental Indenture, dated as of March 16, 2021, between the Company and The Bank of New York Mellon, as Trustee, relating to $400,000,000 principal amount of the Company’s 3.550% Senior Notes due 2052, including the form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on March 16, 2021).
Third Supplemental Indenture, dated as of September 15, 2021, between the Company and The Bank of New York Mellon, as Trustee, relating to $350,000,000 principal amount of the Company’s 3.150% Senior Notes due 2061, including the form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on September 15, 2021).
118

Subordinated Indenture, dated as of March 26, 2018, between the Company and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on March 26, 2018).
118

First Supplemental Indenture, dated as of March 26, 2018, between the Company and The Bank of New York Mellon, as Trustee, relating to $185,000,000 principal amount of the Company’s 5.700% Subordinated Debentures due 2058, including the form of the Securities as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on March 26, 2018).
Second Supplemental Indenture, dated as of December 16, 2019, between the Company and the Bank of New York Mellon, as Trustee, relating to $300,000,000 principal amount of the Company's 5.100% Subordinated Debentures due 2059, including the form of the Securities as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on December 16, 2019).
Third Supplemental Indenture, dated as of September 21, 2020, between the Company and The Bank of New York Mellon, as Trustee, relating to $250,000,000 principal amount of the Company’s 4.250% Subordinated Debentures due 2060, including the form of the Securities as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on September 21, 2020).
Fourth Supplemental Indenture, dated as of February 10, 2021, between the Company and The Bank of New York Mellon, as Trustee, relating to $300,000,000 principal amount of the Company’s 4.125% Subordinated Debentures due 2061, including the form of the Securities as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on February 10, 2021).
(4.14)The instruments defining the rights of holders of the other long term debt securities of the Company are omitted pursuant to Section (b)(4)(iii)(A) of Item 601 of Regulation S-K. The Company agrees to furnish supplementally copies of these instruments to the Commission upon request.
Credit Agreement, dated as of April 1, 2022, by and among W. R. Berkley Corporation, as borrower, each lender from time to time party thereto, Credit Suisse AG, New York Branch, JPMorgan Chase Bank, N.A. and Morgan Stanley Senior Funding, Inc. as Syndication Agents, and Bank of America, N.A., as Administrative Agent, Several L/C Agent and Fronting L/C Issuer (incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on April 4, 2022).
(10.2)
W. R. Berkley Corporation 2018 Stock Incentive Plan (incorporated by reference to Annex B of the Company’s 2018 Proxy Statement (File No. 1-15202) filed with the Commission on April 19, 2018).
(10.3)
Form of Restricted Stock Unit Agreement for grant of April 4, 2003 (incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 6, 2003).
(10.4)
Form of Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2003 Stock Incentive Plan (incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on May 3, 2005).
(10.5)
Form of Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2003 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 6, 2010).
(10.6)
Form of Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company's Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 8, 2012).
(10.7)
Form of 2014 Performance-Based Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company's Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 7, 2014).
(10.8)
Form of 2015 Performance-Based Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company's Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 9, 2015).
119

(10.9)
Form of 2017 Performance-Based Restricted Stock Unit Agreement Underunder the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 8, 2017).
119

(10.10)
Form of 2018 Performance-Based Restricted Stock Unit Agreement Underunder the W. R. Berkley Corporation 2018 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 7, 2018).
(10.11)
Form of 2020 Performance-Based Restricted Stock Unit Agreement Underunder the W. R. Berkley Corporation 2018 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 5, 2020).
Form of 2023 Performance-Based Restricted Stock Unit Agreement Under the W. R. Berkley Corporation 2018 Stock Incentive Plan.
(10.12)3)
W. R. Berkley Corporation Deferred Compensation Plan for Officers as amended and restated effective December 1, 2021 (incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on November 12, 2021).
W. R. Berkley Corporation Deferred Compensation Plan for Directors as amended and restated effective December 1, 2021 (incorporated by reference to Exhibit 10.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on November 12, 2021).
W. R. Berkley Corporation Amended and Restated Annual Incentive Compensation Plan (incorporated by reference to Exhibit 10.1 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on February 25, 2019).
W. R. Berkley Corporation 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.2 of the Company's current Report on Form 8-K (File No. 1-15202) filed with the Commission on February 25, 2019).
Form of 2019 Performance Unit Award Agreement under the W. R. Berkley Corporation 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.3 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on February 25, 2019).
Form of 2020 Performance Unit Award Agreement under the W. R. Berkley Corporation 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 3, 2020).
Form of 2021 Performance Unit Award Agreement under the W. R. Berkley Corporation 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 4, 2021).
(10.19)(10.19)
Form of 2022 Performance Unit Award Agreement under the W. R. Berkley Corporation 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on May 3, 2022).
(10.20)Form of 2023 Performance Unit Award Agreement under the W. R. Berkley Corporation 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on May 4, 2023).
W. R. Berkley Corporation 2009 Directors Stock Plan (incorporated by reference to Annex B of the Company’s 2021 Proxy Statement (File No. 1-15202) filed with the Commission on April 27, 2021).
Supplemental Benefits Agreement between William R. Berkley and the Company as amended and restated as of December 21, 2011 (incorporated by reference to Exhibit 10.14 of the Company's Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on February 28, 2012).
(14)
Code of Ethics for Senior Financial Officers (incorporated by reference to Exhibit 14 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on March 14, 2005).
(21)
List of the Company’s subsidiaries.
(23)
Consent of Independent Registered Public Accounting Firm.
Certification of the Chief Executive Officer pursuant to Rule 13a-14(a)/ 15d-14(a).
120

Certification of the Chief Financial Officer pursuant to Rule 13a-14(a)/ 15d-14(a).
Certification of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
(97)
W. R. Berkley Corporation Clawback Policy.
120

ITEM 16. FORM 10-K Summary
None.

121

SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

    W. R. BERKLEY CORPORATION
 By /s/ W. Robert Berkley, Jr.
 W. Robert Berkley, Jr.
 President and Chief Executive Officer
February 24, 202323, 2024
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
122

Signature Title Date
     
/s/ William R. BerkleyExecutive Chairman February 24, 202323, 2024
 William R. Berkley of the Board of Directors  
   
/s/ W. Robert Berkley, Jr.President February 24, 202323, 2024
 W. Robert Berkley, Jr. Chief Executive Officer and Director
(Principal executive officer)  
   
/s/ Christopher L. AugostiniDirector February 24, 202323, 2024
 Christopher L. Augostini 
/s/ Ronald E. BlaylockDirector February 24, 202323, 2024
 Ronald E. Blaylock   
   
/s/ Mary C. FarrellDirector February 23, 2024
 Mark E. BrockbankMary C. Farrell   
   
/s/ Mary C. FarrellDirectorFebruary 24, 2023
 Mary C. Farrell
/s/ María Luisa FerréDirector February 24, 202323, 2024
 María Luisa Ferré 
/s/ Daniel L. MosleyDirectorFebruary 24, 202323, 2024
 Daniel L. Mosley
/s/ Mark L. ShapiroDirector February 24, 202323, 2024
 Mark L. Shapiro   
/s/ Jonathan TalismanDirectorFebruary 24, 202323, 2024
 Jonathan Talisman
/s/ Richard M. BaioExecutive Vice President February 24, 202323, 2024
 Richard M. Baio and Chief Financial Officer
(Principal financial officer
and principal accounting officer)

123122

Schedule II
W. R. Berkley Corporation
Condensed Financial Information of Registrant
Balance Sheets (Parent Company)

December 31, December 31,
(In thousands)(In thousands)20222021(In thousands)20232022
Assets:Assets:  Assets:  
Cash and cash equivalentsCash and cash equivalents$103,522 $684,037 
Fixed maturity securities available for sale at fair value (cost $285,900 and $805,211 at December 31, 2022 and 2021, respectively)275,511 806,074 
Loans receivable (net of allowance for expected credit losses of $559 and $647 at December 31, 2022 and 2021, respectively)109,793 93,397 
Equity securities, at fair value (cost $3,430 in both 2022 and 2021)3,430 3,430 
Fixed maturity securities available for sale at fair value (cost $190,708 and $285,900 at December 31, 2023 and 2022, respectively)
Loans receivable (net of allowance for expected credit losses of $1,146 and $559 at December 31, 2023 and 2022, respectively)
Equity securities, at fair value (cost $3,430 in both 2023 and 2022)
Investment in subsidiariesInvestment in subsidiaries8,888,455 8,516,916 
Current federal income taxesCurrent federal income taxes34,452 23,424 
Deferred federal income taxesDeferred federal income taxes304,191 11,796 
Property, furniture and equipment at cost, less accumulated depreciationProperty, furniture and equipment at cost, less accumulated depreciation11,356 11,916 
Other assetsOther assets39,741 43,793 
Total assetsTotal assets$9,770,451 $10,194,783 
Liabilities and stockholders’ equity:Liabilities and stockholders’ equity: 
Liabilities:Liabilities: 
Liabilities:
Liabilities:
Due to subsidiaries
Due to subsidiaries
Due to subsidiariesDue to subsidiaries$53,029 $138,376 
Other liabilitiesOther liabilities139,150 146,892 
Current federal income taxes
Subordinated debentures
Subordinated debentures
Subordinated debenturesSubordinated debentures1,008,371 1,007,652 
Senior notesSenior notes1,821,569 2,248,852 
Total liabilitiesTotal liabilities3,022,119 3,541,772 
Stockholders’ equity:Stockholders’ equity: 
Preferred stockPreferred stock— — 
Preferred stock
Preferred stock
Common stockCommon stock105,803 105,803 
Additional paid-in capitalAdditional paid-in capital997,534 981,104 
Retained earnings (including accumulated undistributed net income of subsidiaries of $7,975,360 and $6,463,882 at December 31, 2022 and 2021, respectively)10,161,005 9,015,135 
Retained earnings (including accumulated undistributed net income of subsidiaries of $8,497,674 and $7,975,360 at December 31, 2023 and 2022, respectively)
Accumulated other comprehensive lossAccumulated other comprehensive loss(1,264,581)(281,955)
Treasury stock, at costTreasury stock, at cost(3,251,429)(3,167,076)
Total stockholders’ equityTotal stockholders’ equity6,748,332 6,653,011 
Total liabilities and stockholders’ equityTotal liabilities and stockholders’ equity$9,770,451 $10,194,783 
________________
See Report of Independent Registered Public Accounting Firm and note to condensed financial information.

124123

Schedule II, Continued

W. R. Berkley Corporation
Condensed Financial Information of Registrant, Continued
Statements of Income (Parent Company)
Year Ended December 31, Year Ended December 31,
(In thousands)(In thousands)202220212020(In thousands)202320222021
Management fees and investment income including dividends from subsidiaries of $22,807, $520,251, and $617,424 for the years ended December 31, 2022, 2021 and 2020, respectively$32,585 $548,512 $654,485 
Net investment gains1,007 1,474 3,580 
Management fees and investment income including dividends from subsidiaries of $1,261,166, $22,807, and $520,251 for the years ended December 31, 2023, 2022 and 2021, respectively
Net investment (losses) gains
Other incomeOther income1,916 1,138 568 
Total revenues Total revenues35,508 551,124 658,633 
Operating costs and expenseOperating costs and expense192,175 214,995 166,892 
Interest expenseInterest expense129,633 144,837 145,417 
(Loss) income before federal income taxes(286,300)191,292 346,324 
Income (loss) before federal income taxes
Federal income taxes:Federal income taxes:   Federal income taxes:  
Federal income taxes provided by subsidiaries on a separate return basisFederal income taxes provided by subsidiaries on a separate return basis414,660 294,731 188,490 
Federal income tax expense on a consolidated return basisFederal income tax expense on a consolidated return basis(258,776)(226,900)(139,679)
Net federal income tax expense155,884 67,831 48,811 
(Loss) income before undistributed equity in net income of subsidiaries(130,416)259,123 395,135 
Net federal income tax (expense) benefit
Income (loss) before undistributed equity in net income of subsidiaries
Equity in undistributed net income of subsidiariesEquity in undistributed net income of subsidiaries1,511,478 763,367 135,535 
Net income Net income$1,381,062 $1,022,490 $530,670 
________________
See Report of Independent Registered Public Accounting Firm and note to condensed financial information.
125124

Schedule II, Continued

W. R. Berkley Corporation
Condensed Financial Information of Registrant, Continued
Statements of Cash Flows (Parent Company)
Year Ended December 31, Year Ended December 31,
(In thousands)(In thousands)202220212020(In thousands)202320222021
Cash flow (used in) from operating activities:   
Cash flow from (used in) operating activities:Cash flow from (used in) operating activities:  
Net incomeNet income$1,381,062 $1,022,490 $530,670 
Adjustments to reconcile net income to net cash from operating activities:Adjustments to reconcile net income to net cash from operating activities:
Net investment gains(1,007)(1,474)(3,580)
Depreciation and amortization4,281 18,761 15,133 
Net investment losses (gains)
Net investment losses (gains)
Net investment losses (gains)
Depreciation and (accretion) amortization
Equity in undistributed earnings of subsidiariesEquity in undistributed earnings of subsidiaries(1,511,478)(763,367)(135,535)
Tax payments received from subsidiariesTax payments received from subsidiaries321,682 328,851 165,495 
Federal income taxes provided by subsidiaries on a separate return basisFederal income taxes provided by subsidiaries on a separate return basis(414,660)(294,731)(188,489)
Stock incentive plansStock incentive plans49,411 48,440 49,599 
Change in:Change in:
Federal income taxesFederal income taxes(40,746)(22,017)32,069 
Federal income taxes
Federal income taxes
Other assetsOther assets3,163 (33,319)1,220 
Other liabilitiesOther liabilities87,100 (11,758)3,964 
Accrued investment incomeAccrued investment income890 755 836 
Net cash (used in) from operating activities(120,302)292,631 471,382 
Net cash from (used in) operating activities
Cash from (used in) investing activities:Cash from (used in) investing activities:   Cash from (used in) investing activities:  
Proceeds from sales of fixed maturity securitiesProceeds from sales of fixed maturity securities543,549 402,046 414,802 
Proceeds from maturities and prepayments of fixed maturity securitiesProceeds from maturities and prepayments of fixed maturity securities83,134 654,134 258,413 
Cost of purchases of fixed maturity securitiesCost of purchases of fixed maturity securities(109,289)(1,071,823)(747,713)
Cost of purchases of fixed maturity securities
Cost of purchases of fixed maturity securities
Change in loans receivableChange in loans receivable(16,249)(18,227)(20,023)
Change in loans receivable
Change in loans receivable
Investments in and advances to subsidiaries, net
Investments in and advances to subsidiaries, net
Investments in and advances to subsidiaries, netInvestments in and advances to subsidiaries, net(171,062)(1,411)(100,704)
Change in balance due to security brokerChange in balance due to security broker(10,289)10,487 (245)
Net additions to real estate, furniture & equipmentNet additions to real estate, furniture & equipment(432)(1,496)(81)
Other, netOther, net368 95 103 
Net cash from (used in) investing activitiesNet cash from (used in) investing activities319,730 (26,195)(195,448)
Cash (used in) from financing activities:Cash (used in) from financing activities:   Cash (used in) from financing activities:  
Net proceeds from issuance of senior notesNet proceeds from issuance of senior notes(914)1,029,579 736,609 
Repayment and redemption of debtRepayment and redemption of debt(426,503)(400,000)(650,000)
Repayment and redemption of debt
Repayment and redemption of debt
Purchase of common treasury sharesPurchase of common treasury shares(94,140)(122,426)(346,357)
Cash dividends to common stockholdersCash dividends to common stockholders(235,192)(355,736)(84,147)
Other, netOther, net(23,194)(30,776)(24,880)
Net cash (used in) from financing activitiesNet cash (used in) from financing activities(779,943)120,641 (368,775)
Net (decrease) increase in cash and cash equivalents(580,515)387,077 (92,841)
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents at beginning of yearCash and cash equivalents at beginning of year684,037 296,960 389,801 
Cash and cash equivalents at end of yearCash and cash equivalents at end of year$103,522 $684,037 $296,960 
________________
See Report of Independent Registered Public Accounting Firm and note to condensed financial information.
126125

W. R. Berkley Corporation
Condensed Financial Information of Registrant, Continued
December 31, 20222023
Note to Condensed Financial Information (Parent Company)
The accompanying condensed financial information should be read in conjunction with the notes to consolidated financial statements included elsewhere herein. Reclassifications have been made in the 20212022 and 20202021 financial statements as originally reported to conform them to the presentation of the 20222023 financial statements.
The Company files a consolidated federal income tax return with the results of its domestic insurance subsidiaries included on a statutory basis. Under present Company policy, federal income taxes payable by subsidiary companies on a separate-return basis are paid to W. R. Berkley Corporation, and the Company pays the tax due on a consolidated return basis.

127126

Schedule III

W. R. Berkley Corporation and Subsidiaries
Supplementary Insurance Information
December 31, 2023, 2022 2021 and 20202021
(In thousands)(In thousands)Deferred
Policy
Acquisition
Cost		Reserve for
Losses and
Loss Expenses		Unearned
Premiums		Net Premiums
Earned		Net
Investment
Income		Loss and Loss
Expenses		Amortization of
Deferred Policy
Acquisition
Cost		Other
Operating Costs
and Expenses		Net
Premiums
Written		(In thousands)Deferred
Policy
Acquisition
Cost		Reserve for
Losses and
Loss Expenses		Unearned
Premiums		Net Premiums
Earned		Net
Investment
Income		Loss and Loss
Expenses		Amortization of
Deferred Policy
Acquisition
Cost		Other
Operating Costs
and Expenses		Net
Premiums
Written
December 31, 2023December 31, 2023  
Insurance
Reinsurance & Monoline Excess
Corporate, other and eliminations
Total
December 31, 2022December 31, 2022         December 31, 2022  
InsuranceInsurance$651,257 $13,786,112 $4,779,214 $8,369,062 $550,084 $5,130,909 $935,469 $1,430,456 $8,784,146 
Reinsurance & Monoline ExcessReinsurance & Monoline Excess112,229 3,225,111 518,440 1,192,367 194,272 730,841 103,434 235,836 1,219,924 
Corporate, other and eliminationsCorporate, other and eliminations— — — — 34,829 — — 256,310 — 
TotalTotal$763,486 $17,011,223 $5,297,654 $9,561,429 $779,185 $5,861,750 $1,038,903 $1,922,602 $10,004,070 
December 31, 2021December 31, 2021         December 31, 2021  
InsuranceInsurance$566,718 $12,379,395 $4,348,171 $7,077,708 $468,821 $4,326,403 $830,199 $1,202,192 $7,743,814 
Reinsurance & Monoline ExcessReinsurance & Monoline Excess109,427 3,011,493 498,989 1,028,323 175,324 627,557 131,429 174,098 1,119,053 
Corporate, other and eliminationsCorporate, other and eliminations— — — — 27,473 — — 261,352 — 
TotalTotal$676,145 $15,390,888 $4,847,160 $8,106,031 $671,618 $4,953,960 $961,628 $1,637,642 $8,862,867 
December 31, 2020         
Insurance$467,871 $10,977,674 $3,660,758 $6,067,669 $375,554 $3,939,759 $734,062 $1,137,002 $6,347,101 
Reinsurance & Monoline Excess88,297 2,806,756 412,433 863,174 146,029 528,947 170,893 103,775 915,336 
Corporate, other and eliminations— — — — 62,238 — — 244,660 — 
Total$556,168 $13,784,430 $4,073,191 $6,930,843 $583,821 $4,468,706 $904,955 $1,485,437 $7,262,437 
__________________________
See Report of Independent Registered Public Accounting Firm.
128127

Schedule IV

W. R. Berkley Corporation and Subsidiaries
Reinsurance
Years ended December 31, 2023, 2022 2021 and 20202021
Premiums Written
Premiums Written
(In thousands, other than percentages)(In thousands, other than percentages)Direct
Amount		Ceded
to Other
Companies		Assumed
from Other
Companies		Net
Amount		Percentage
of Amount
Assumed
to Net
(In thousands, other than percentages)
(In thousands, other than percentages)Direct
Amount		Ceded
to Other
Companies		Assumed
from Other
Companies		Net
Amount		Percentage
of Amount
Assumed
to Net
Year ended December 31, 2023Year ended December 31, 2023  
InsuranceInsurance$11,310,709 $1,904,017 $250,429 $9,657,121 2.6 %
Reinsurance & Monoline ExcessReinsurance & Monoline Excess366,034 113,522 1,044,834 1,297,346 80.5 %
TotalTotal$11,676,743 $2,017,539 $1,295,263 $10,954,467 11.8 %
Year ended December 31, 2022Year ended December 31, 2022     Year ended December 31, 2022   
InsuranceInsurance$10,363,730 $1,799,639 $220,055 $8,784,146 2.5 %Insurance$10,363,730 $$1,799,639 $$220,055 $$8,784,146 2.5 2.5 %
Reinsurance & Monoline ExcessReinsurance & Monoline Excess331,408 105,343 993,859 1,219,924 81.5 %Reinsurance & Monoline Excess331,408 105,343 105,343 993,859 993,859 1,219,924 1,219,924 81.5 81.5 %
TotalTotal$10,695,138 $1,904,982 $1,213,914 $10,004,070 12.1 %Total$10,695,138 $$1,904,982 $$1,213,914 $$10,004,070 12.1 12.1 %
Year ended December 31, 2021Year ended December 31, 2021     Year ended December 31, 2021   
InsuranceInsurance$9,220,683 $1,727,854 $250,985 $7,743,814 3.2 %Insurance$9,220,683 $$1,727,854 $$250,985 $$7,743,814 3.2 3.2 %
Reinsurance & Monoline ExcessReinsurance & Monoline Excess310,367 109,413 918,099 1,119,053 82.0 %Reinsurance & Monoline Excess310,367 109,413 109,413 918,099 918,099 1,119,053 1,119,053 82.0 82.0 %
TotalTotal$9,531,050 $1,837,267 $1,169,084 $8,862,867 13.2 %Total$9,531,050 $$1,837,267 $$1,169,084 $$8,862,867 13.2 13.2 %
Year ended December 31, 2020     
Insurance$7,625,981 $1,490,395 $211,515 $6,347,101 3.3 %
Reinsurance & Monoline Excess248,069 94,815 762,082 915,336 83.3 %
Total$7,874,050 $1,585,210 $973,597 $7,262,437 13.4 %
___________________________
See Report of Independent Registered Public Accounting Firm.
129128

Schedule V

W. R. Berkley Corporation and Subsidiaries
Valuation and Qualifying Accounts
Years ended December 31, 2023, 2022 2021 and 20202021
(In thousands)(In thousands)Opening Allowance
Balance		Cumulative Effect Adjustment - CECLAdditions-
Charged to
Expense		Deduction-
Amounts
Written Off		Ending Allowance
Balance
(In thousands)
(In thousands)Opening Allowance
Balance		Additions-
Charged to
Expense		Deduction-
Amounts
Written Off		Ending Allowance
Balance
Year ended December 31, 2023
Premiums, fees and other receivables
Premiums, fees and other receivables
Premiums, fees and other receivables
Due from reinsurers
Deferred federal and foreign income taxes
Fixed maturity securities
Loan loss reserves
Total
Year ended December 31, 2022Year ended December 31, 2022Year ended December 31, 2022   
Premiums, fees and other receivablesPremiums, fees and other receivables$30,860 $— $13,734 $(7,663)$36,931 
Due from reinsurersDue from reinsurers7,713 — 352 (1)8,064 
Deferred federal and foreign income taxesDeferred federal and foreign income taxes75,230 — 1,046 (29,110)47,166 
Fixed maturity securitiesFixed maturity securities22,625 — 15,152 (311)37,466 
Loan loss reservesLoan loss reserves1,718 — 73 — 1,791 
TotalTotal$138,146 $— $30,357 $(37,085)$131,418 
Year ended December 31, 2021Year ended December 31, 2021    Year ended December 31, 2021   
Premiums, fees and other receivablesPremiums, fees and other receivables$27,855 $— $10,807 $(7,802)$30,860 
Due from reinsurersDue from reinsurers7,801 — 334 (422)7,713 
Deferred federal and foreign income taxesDeferred federal and foreign income taxes79,488 — 6,011 (10,269)75,230 
Fixed maturity securitiesFixed maturity securities2,580 — 21,013 (968)22,625 
Loan loss reservesLoan loss reserves5,437 — — (3,719)1,718 
TotalTotal$123,161 $— $38,165 $(23,180)$138,146 
Year ended December 31, 2020    
Premiums, fees and other receivables$26,546 $1,270 $6,783 $(6,744)$27,855 
Due from reinsurers690 5,927 1,187 (3)7,801 
Deferred federal and foreign income taxes33,250 — 46,756 (518)79,488 
Fixed maturity securities— 35,714 16,909 (50,043)2,580 
Loan loss reserves2,146 (357)3,648 — 5,437 
Total$62,632 $42,554 $75,283 $(57,308)$123,161 
_______________________
See Report of Independent Registered Public Accounting Firm.

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Schedule VI

W. R. Berkley Corporation and Subsidiaries
Supplementary Information Concerning Property-Casualty Insurance Operations
Years Ended December 31, 2023, 2022 2021 and 20202021
(In thousands)(In thousands)202220212020(In thousands)202320222021
Deferred policy acquisition costsDeferred policy acquisition costs$763,486 $676,145 $556,168 
Reserves for losses and loss expensesReserves for losses and loss expenses17,011,223 15,390,888 13,784,430 
Unearned premiumsUnearned premiums5,297,654 4,847,160 4,073,191 
Net premiums earnedNet premiums earned9,561,429 8,106,031 6,930,843 
Net investment incomeNet investment income779,185 671,618 583,821 
Losses and loss expenses incurred:Losses and loss expenses incurred:
Current yearCurrent year5,774,713 4,921,191 4,432,937 
Current year
Current year
Prior yearsPrior years54,511 863 627 
Loss reserve discount accretionLoss reserve discount accretion32,526 31,906 35,142 
Amortization of deferred policy acquisition costsAmortization of deferred policy acquisition costs1,038,903 961,628 904,955 
Paid losses and loss expensesPaid losses and loss expenses4,347,910 3,665,694 3,598,649 
Net premiums writtenNet premiums written10,004,070 8,862,867 7,262,437 
___________________
See Report of Independent Registered Public Accounting Firm.
131130