# EDGAR Filing Document

**Accession Number:** 0000354190
**File Stem:** 0000354190-26-000103
**Filing Date:** 2026-3
**Character Count:** 534287
**Document Hash:** 96855efe50dd4a94f74d8ac83657b2d3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000354190-26-000103.hdr.sgml**: 20260323

**ACCESSION NUMBER**: 0000354190-26-000103

**CONFORMED SUBMISSION TYPE**: ARS

**PUBLIC DOCUMENT COUNT**: 145

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260323

**DATE AS OF CHANGE**: 20260323

**EFFECTIVENESS DATE**: 20260323

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Arthur J. Gallagher & Co.
- **CENTRAL INDEX KEY:** 0000354190
- **STANDARD INDUSTRIAL CLASSIFICATION:** INSURANCE AGENTS BROKERS & SERVICES [6411]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 362151613
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** ARS
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-09761
- **FILM NUMBER:** 26782946

**BUSINESS ADDRESS:**
- **STREET 1:** 2850 GOLF ROAD
- **CITY:** ROLLING MEADOWS
- **STATE:** IL
- **ZIP:** 60008-4050
- **BUSINESS PHONE:** 630-773-3800

**MAIL ADDRESS:**
- **STREET 1:** 2850 GOLF ROAD
- **CITY:** ROLLING MEADOWS
- **STATE:** IL
- **ZIP:** 60008-4050

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ARTHUR J. GALLAGHER & CO.
- **DATE OF NAME CHANGE:** 20190819

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GALLAGHER ARTHUR J & CO
- **DATE OF NAME CHANGE:** 19920703

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Leading Together Confidence Through Collaboration 2025 ANNUAL REPORT

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Shared values at Arthur J. Gallagher & Co. are the rock foundation of the company and our culture. What is a shared value? These are concepts that the vast majority of the movers and shakers in the company passionately adhere to. What are some of Arthur J. Gallagher & Co.'s shared values? When accepted shared values are changed or challenged, the emotional impact and negative feelings can damage the company. Robert E. Gallagher, May 1984 We are a sales and marketing company dedicated to providing excellence in risk management services to our clients. We support one another. We believe in one another. We acknowledge and respect the ability of one another. We push for professional excellence. We can all improve and learn from one another. There are no second-class citizens — everyone is important and everyone's job is important. We're an open society. Empathy for the other person is not a weakness. Suspicion breeds more suspicion. To trust and be trusted is vital. Leaders need followers. How leaders treat followers has a direct impact on the effectiveness of the leader. Interpersonal business relationships should be built. We all need one another. We are all cogs in a wheel. No department or person is an island. Professional courtesy is expected. Never ask someone to do something you wouldn't do yourself. I consider myself support for our sales and marketing. We can't make things happen without each other. We are a team. Loyalty and respect are earned — not dictated. Fear is a turnoff. People skills are very important at Arthur J. Gallagher & Co. We're a very competitive and aggressive company. We run to problems — not away from them. We adhere to the highest standards of moral and ethical behavior. People work harder and are more effective when they're turned on — not turned off. We are a warm, close company. This is a strength — not a weakness. We must continue building a professional company — together — as a team. Shared values can be altered with circumstances — but carefully and with tact and consideration for one another's needs. The Gallagher Way The Gallagher Way — which spells out the key tenets of Gallagher's culture — is a one-page document written in 1984 by our late Chairman and CEO, Robert E. Gallagher. 1 14 2 15 3 16 4 17 5 6 18 7 19 8 20 10 22 11 23 12 24 13 25 9 21

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ________________________________________________________ FORM 10-K ________________________________________________________ x Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2025 o Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from__________________to Commission file number 1-09761 ARTHUR J. GALLAGHER & CO. (Exact name of registrant as specified in its charter) Delaware 36-2151613 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification Number) 2850 Golf Road Rolling Meadows, Illinois 60008-4050 (Address of principal executive offices) (Zip Code) (630) 773-3800 (Registrant's telephone number, including area code) ________________________________________________________ Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, par value $1.00 per share AJG New 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 x No o. Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o No x. Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No o. 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 x No o. Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or emerging growth company. See 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 x Accelerated filer o Non-accelerated filer o Smaller reporting company o Emerging growth company o 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. o

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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. 726(b)) by the registered public accounting firm that prepared or issued its audit report Yes x No o. 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. o 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). o Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No x. The aggregate market value of the voting common equity held by non-affiliates of the registrant, computed by reference to the last reported price at which the registrant's common equity was sold on June 30, 2025 (the last day of the registrant's most recently completed second quarter) was $71,117 million. The number of outstanding shares of the registrant's Common Stock, $1.00 par value, as of January 31, 2026 was 257.1 million. Documents incorporated by reference: Portions of Arthur J. Gallagher & Co.'s definitive 2026 Proxy Statement are incorporated by reference into this Form 10-K in response to Part III to the extent described herein.

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Information Concerning Forward-Looking Statements This report contains certain statements related to future results, or states our intentions, beliefs and expectations or predictions for the future of Arthur J. Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our, us, Gallagher or the Company, which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements relate to expectations or forecasts of future events. Such statements use words such as "anticipate," "believe," "estimate," "expect," "contemplate," "forecast," "project," "intend," "plan," "potential," and other similar terms, and future or conditional tense verbs like "could," "may," "might," "see," "should," "will" and "would." You can also identify forward-looking statements by the fact that they do not relate strictly to historical or current facts. For example, we may use forward-looking statements when addressing topics such as: the impact of general economic conditions, including inflation, interest rates and market uncertainty; the effects of geopolitical volatility, including repercussions from the armed conflicts in Ukraine, the Middle East, Latin America and the Caribbean; market and industry conditions, including competitive and pricing trends and the impact of large natural events; acquisition strategy including the expected size of our acquisition program; the expected impact of acquisitions and dispositions and integrating recent acquisitions, including comments regarding the expected benefits of our acquisition of Woodruff-Sawyer & Co. (which we refer to as Woodruff Sawyer) and Dolphin TopCo, Inc., the holding company of AssuredPartners, Inc. (which we refer to as AssuredPartners), and other acquisitions larger than our typical tuck-in acquisitions and the expected duration and costs of integrating such large acquisitions; the development and performance of our services and products; changes in the composition or level of our revenues or earnings; our cost structure and the size and outcome of cost-saving or restructuring initiatives; future capital expenditures; future debt levels and anticipated actions to be taken in connection with maturing debt; future debt to earnings ratios; the outcome of contingencies; dividend policy; pension obligations; cash flow and liquidity; capital structure and financial losses; future actions by regulators; the outcome of existing regulatory actions, audits, reviews or litigation; the impact of changes in accounting rules; financial markets; interest rates; foreign exchange rates; matters relating to our operations; income taxes; expectations regarding our investments; human capital management, including diversity and inclusion initiatives, and sustainability, including climate-resilience and climate- advisory products and services and our carbon emissions. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors. Potential factors that could impact results include: • Global economic and geopolitical events, such as fluctuations in interest and inflation rates; geo-economic fragmentation and protectionism such as tariffs, trade wars or similar governmental actions affecting the flows of goods, services or currency; a recession or economic downturn; a U.S. government shutdown; political violence and instability, including as a result of the armed conflicts in Ukraine, the Middle East, Latin America and the Caribbean; • Economic conditions that result in financial difficulties for underwriting enterprises or lead to reduced risk-taking capital capacity, for example, as a result of large payouts related to extreme weather events, or to the failure of such enterprises, including the increased risk of errors and omissions (which we refer to as E&O) claims against us; • Risks that could negatively affect the success of our acquisition strategy, including the impact of economic uncertainty on our ability to source, review and price acquisitions, continuing consolidation in our industry and interest in acquiring insurance brokers on the part of private equity firms and newly public insurance brokers, which makes it more difficult to identify targets and in some cases makes them more expensive, inaccurate assumptions and failure to realize expected benefits; the risk that we may not receive timely regulatory approval of pending transactions, closing risks; execution risks, integration risks, poor cultural fit, the risk of post-acquisition deterioration leading to intangible asset impairment charges, and the risk we could incur or assume unanticipated liabilities such as cybersecurity issues or violations of anti-corruption and sanctions laws; • Risks related to Woodruff Sawyer, AssuredPartners and other acquisitions larger than our usual tuck-in acquisitions, including risks related to our ability to successfully integrate operations, the possibility that our assumptions may be inaccurate resulting in unforeseen obligations or liabilities and failure to realize the expected benefits of these acquisitions; • Damage to our reputation, including as a result of failing to uphold our culture and the potential for the Internet and social media to magnify the effects of such reputational issues; 1

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• Failure to meet our sustainability aspirations, goals and initiatives or to comply with increasingly complex climate-related and other sustainability regulations, heightened scrutiny, including a growing backlash against sustainability initiatives, and increased risks related to "greenwashing" and "greenhushing;" • Failure to apply technology, data analytics and artificial intelligence (which we refer to as AI) effectively in driving value for our clients through technology-based solutions, or failure to gain internal efficiencies and effective internal controls through the application of technology and related tools; • Risks associated with the use of AI in our business operations, including regulatory, data privacy, cybersecurity, E&O, intellectual property and competition risks; • Failure to attract and retain experienced and qualified talent, including our senior management team, or adequately plan and execute for the succession of such leaders; increased costs resulting from increased compensation and benefits packages as a result of a tighter labor market, and negative effects from restrictions on non-compete agreements at the state level; • A disaster or other significant disruption to business continuity for our own operations or those of third-parties on which we rely, including cybersecurity incidents; natural disasters; political violence and unrest in the U.S. or elsewhere around the world; for example, our substantial operations in India could be negatively impacted as a result of the dispute between India and Pakistan involving the Kashmir region, rising tensions between India and China, or incidents of terrorism in India, civil unrest or other reasons; • Sustained increases in the cost of employee benefits and compensation expense; • Risks arising from our international operations and changes in international conditions, including the risks posed by political and economic uncertainty in certain countries (including repercussions from the armed conflicts in Ukraine, the Middle East, Latin America and the Caribbean), maintaining regulatory and legal compliance across multiple jurisdictions (such as those relating to violations of anti-corruption, sanctions, and privacy laws, increasingly complex regulatory requirements related to climate change and sustainability issues); increased protectionism, tariffs, and trade wars, climate change and other long-term sustainability matters, increased scrutiny of the use of off-shore centers of excellence such as those we operate and global health risks; • Risks related to changes in U.S. or foreign tax laws, including a U.S. or foreign tax rate change, such as those resulting from the One Big Beautiful Bill Act (which we refer to as OBBBA), changes to the U.S. Inflation Reduction Act, the Organisation for Economic Co- operation and Development's (which we refer to as the OECD) global minimum corporate tax regime, and other local policy changes; • Competitive pressures, including as a result of innovation, in each of our businesses; • Volatility or declines in premiums or other adverse trends in the insurance industry; • The higher level of variability inherent in contingent and supplemental revenues versus standard commission revenues; • Risks particular to our benefit consulting operations, including risks related to the acquisition of BCHR Holdings, L.P. and its subsidiaries, dba Buck (which we refer to as Buck) and Redington Ltd. (which we refer to as Redington), an investment consulting firm regulated by the Financial Conduct Authority (which we refer to as the FCA); • Risks particular to our third-party claims administrations operations, including risks related to the availability of RISX-FACS®, our proprietary risk management information system, wage inflation, staffing shortages, any slowing of the trend toward outsourcing claims administration, and the concentration of large amounts of revenue with certain clients; • Climate risks, including the risk of a systemic economic crisis and disruptions to our business caused by the transition to a low-carbon economy; 2

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• Cyber-attacks or other cybersecurity incidents and the heightened risk of such attacks as a result of the armed conflicts in Ukraine, the Middle East, Latin America and the Caribbean, improper disclosure of confidential, personal or proprietary data and changes to laws and regulations governing cybersecurity and data privacy; • Unfavorable determinations related to contingencies and legal proceedings, including; violations or alleged violations of the U.S. Foreign Corrupt Practices Act (which we refer to as FCPA), the U.K. Bribery Act 2010 or other anti-corruption laws and the Foreign Account Tax Compliance provisions of the Hiring Incentives to Restore Employment Act, and the outcome of any existing or future investigation, review, regulatory action or litigation; • Failure to comply with regulatory requirements, including those related to governance and control requirements in particular jurisdictions, international sanctions, including new sanctions laws as a result of the armed conflicts in Ukraine, the Middle East, Latin America and the Caribbean; laws relating to the disclosure of sustainability matters; laws relating to the use of AI, or a change in regulations or enforcement policies that adversely affects our operations (for example, relating to insurance broker compensation methods or restrictions on non-compete agreements); • Changes to our financial presentation from new accounting estimates and assumptions; • Intellectual property risks; • Risks related to our legacy clean energy investments, including intellectual property claims, environmental and product liability claims, environmental compliance costs and the risk of disallowance by the Internal Revenue Service of previously claimed tax credits; • The risk that our outstanding debt adversely affects our financial flexibility and restrictions and limitations in the agreements and instruments governing our debt; • The risk of credit rating downgrades; • The risk that we may not be able to receive dividends or other distributions from our subsidiaries, including the effects of significant changes in foreign exchange rates; • The risk of share ownership dilution when we issue common stock; and • Volatility of the price of our common stock. Forward-looking statements are not guarantees of future performance. They involve risks, uncertainties and assumptions, including the risk factors referred to above. Our future performance and actual results or outcomes may differ materially from those expressed in forward-looking statements. Accordingly, you should not place undue reliance on forward-looking statements, which speak only as of, and are based on information available to us on, the date of the applicable document. Many of the factors that will determine these results are beyond our ability to control or predict. All subsequent written and oral forward-looking statements attributable to us or any person acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this section. Forward-looking statements speak only as of the date that they are made, and we do not undertake any obligation to update any such statements or release publicly any revisions to these forward-looking statements to reflect events or circumstances after the date of this report or to reflect new information, future or unexpected events or otherwise, except as required by applicable law or regulation. In addition, historical, current and forward-looking sustainability-related statements may be based on standards for measuring progress that are still developing, internal controls and processes that continue to evolve, and assumptions that are subject to change in the future. A detailed discussion of the factors that could cause actual results to differ materially from our published expectations is contained under the heading "Risk Factors" in our filings with the Securities and Exchange Commission (SEC), including this report and any other reports we file with the SEC in the future. 3

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Arthur J. Gallagher & Co. Annual Report on Form 10-K For the Fiscal Year Ended December 31, 2025 Index Page No. Part I. Item 1. Business 5-10 Item 1A. Risk Factors 11-30 Item 1B. Unresolved Staff Comments 30 Item 1C. Cybersecurity 30-32 Item 2. Properties 32 Item 3. Legal Proceedings 32 Item 4. Mine Safety Disclosures. 32 Information About Our Executive Officers 33 Part II. Item 5. Market for the Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 34-35 Item 6. [Reserved] 35 Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations 35-67 Item 7A. Quantitative and Qualitative Disclosure about Market Risk 67-69 Item 8. Financial Statements and Supplementary Data 70-121 Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 127 Item 9A. Controls and Procedures 127 Item 9B. Other Information 127 Item 9C. Disclosures Regarding Foreign Jurisdictions that Prevent Inspections 127 Part III. Item 10. Directors, Executive Officers and Corporate Governance 128 Item 11. Executive Compensation 128 Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 128 Item 13. Certain Relationships and Related Transactions, and Director Independence 128 Item 14. Principal Accountant Fees and Services 128 Part IV. Item 15. Exhibits and Financial Statement Schedules 128-130 Item 16. Form 10-K Summary 130 Signatures 131 Schedule II - Valuation and Qualifying Accounts 132 4

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Part I Item 1. Business. Overview Arthur J. Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our, us or Gallagher, are engaged in providing insurance brokerage, reinsurance brokerage, consulting, and third-party property/casualty claims settlement and administration services to entities and individuals around the world. We believe that our major strength is our ability to deliver comprehensively structured insurance, reinsurance and risk management solutions, superior claim outcomes and comprehensive consulting services to our clients. Our brokerage segment operations provide brokerage and consulting services to entities of all types, including commercial, nonprofit, public sector entities, insurance companies and insurance capital providers, and to a lesser extent, individuals, in the areas of insurance and reinsurance placements, risk of loss management, and management of employer sponsored benefit programs. Our risk management segment operations provide contract claim settlement, claim administration, loss control services and risk management consulting for commercial, nonprofit, captive and public sector entities, and various other organizations that choose to self-insure property/casualty coverages or choose to use a third-party claims management organization rather than the claim services provided by an underwriting enterprise. We do not assume underwriting risk on a net basis, other than with respect to de minimis amounts necessary to provide minimum or regulatory capital to organize captives, pools, specialized underwriters or risk-retention groups. Rather, capital necessary for covering events of loss is provided by "underwriting enterprises," which we define as insurance companies, reinsurance companies and various other risk-taking entities, including intermediaries of underwriting enterprises, that we do not own or control. Since our founding in 1927, we have grown from a one-person insurance agency to the world's third largest insurance broker/risk manager based on revenues according to Business Insurance magazine's June/July 2025 edition, and one of the world's largest property/casualty third party claims administrators, according to Business Insurance magazine's April/May 2025 edition. We report our results in three segments: brokerage, risk management and corporate. The brokerage and risk management segments contributed approximately 87% and 13%, respectively, to 2025 revenues. We generate approximately 67% of our revenues from the combined brokerage and risk management segments in the U.S., with the remaining 33% generated internationally, primarily in Australia, Canada, New Zealand and the U.K. The corporate segment did not generate any significant revenues in 2025. Shares of our common stock are traded on the New York Stock Exchange under the symbol "AJG", and we had a market capitalization at December 31, 2025 of approximately $67 billion. Information in this report is as of December 31, 2025 unless otherwise noted. We were reincorporated as a Delaware corporation in 1972. Our executive offices are located at 2850 Golf Road, Rolling Meadows, Illinois 60008-4050, and our telephone number is (630) 773-3800. Operating Segments We report our results in three segments: brokerage, risk management and corporate. The major sources of our operating revenues are commissions, fees, supplemental and contingent revenues and interest income, premium finance and other income from our brokerage operation, and fees, including performance-based fees, from our risk management operations. The corporate segment does not generate any significant revenues. Our business, particularly our brokerage business, is subject to seasonal fluctuations. Commissions, fees, supplemental revenues and contingent revenues, and our costs to obtain and fulfill the service obligations to our clients, can vary from quarter to quarter as a result of the timing of contract-effective dates. On the other hand, salaries and employee benefits, rent, depreciation and amortization expenses generally tend to be more uniform throughout the year. The timing of acquisitions, recognition of books of business gains and losses also impact the trends in our quarterly operating results. Brokerage Segment The brokerage segment accounted for 87% of our revenues in 2025. Our brokerage segment operates through a network of more than 650 sales and service offices located throughout the U.S. and approximately 400 sales and service offices in 5

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approximately 60 countries, most of which are in the Australia, Canada, New Zealand and the U.K. Most of these offices are fully staffed with sales and service personnel. We offer client service capabilities in approximately 130 countries around the world through our direct operations as well as through a network of correspondent brokers and consultants. Domestic Retail Insurance Brokerage Operations Our retail insurance brokerage operations accounted for 75% of our brokerage segment revenues in 2025. Our retail brokerage operations place nearly all lines of commercial property/casualty and health and welfare insurance coverage. Significant lines of insurance coverage and consultant capabilities are as follows: Aviation Disability General Liability Products Liability Casualty Earthquake Health & Welfare Professional Liability Claims Advocacy Errors & Omissions Healthcare Analytics Property Commercial Auto Exchange Solutions Human Resources Retirement Compensation Executive Benefits Institutional Investment Surety Bond Cyber Liability Fiduciary Services Loss Control Voluntary Benefits Dental Fine Arts Marine Wind Directors & Officers Liability Fire Medical Workers' Compensation Our retail brokerage operations are organized and operate within certain key niche/practice groups, which account for approximately 74% of our retail brokerage revenues. These specialized teams target areas of business and/or industries in which we have developed a depth of expertise and a large client base. Significant niche/practice groups we serve are as follows: Affinity Equity Advisors Life Sciences Real Estate/Hospitality Automotive Financial Institutions Manufacturing Religious Aviation Food/Agribusiness Marine Restaurant Construction Global Risks Nonprofit Retail and Services Energy Healthcare Personal Technology & Communications Entertainment Higher/K12 Education Private Client Trade Credit/Political Risk Environmental Law Firms Public Sector Transportation Our specialized focus on these niche/practice groups allows for highly-focused marketing efforts and facilitates the development of value-added products and services specific to those industries. We believe that our detailed understanding and broad client contacts within these niche/practice groups provide us with a competitive advantage. We anticipate that our retail brokerage operations' greatest revenue growth over the next several years will continue to come from: • Our niche/practice groups and middle-market accounts; • Cross-selling other brokerage products to existing clients; • Mergers and acquisitions; and • Developing and managing alternative market mechanisms such as captives, rent-a-captives and deductible plans/self-insurance. International and Other Brokerage Related Operations We operate as a retail commercial property and casualty broker throughout 47 locations in Australia, 40 locations in Canada and 37 locations in New Zealand. In the U.K., we operate as a retail broker from approximately 128 locations. We also have specialty, wholesale, underwriting and reinsurance intermediary operations in London for clients to access Lloyd's of London and other international underwriting enterprises, and a program operation offering customized risk 6

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management products and services to U.K. public entities. See the discussion below regarding our "Global Reinsurance Brokerage Operations." In Bermuda, we act principally as a wholesale broker for clients looking to access Bermuda-based underwriting enterprises and we also provide management and administrative services for captive insurance entities. We also have strategic brokerage alliances with a variety of independent brokers in countries where we do not have a local office presence. Between our direct operations and this global network of correspondent insurance brokers and consultants, we are able to serve our clients' coverage and service needs in approximately 130 countries around the world. Global Reinsurance Brokerage Operations Our reinsurance brokerage operations (which we refer to as Gallagher Re) accounted for 12% of our brokerage segment revenues in 2025. Gallagher Re operates from more than 77 offices across 27 countries, with specialist expertise, underpinned by a portfolio of analytics capabilities including catastrophe modeling, dynamic financial analysis, rating agency analysis and capital modeling. Our reinsurance brokers assist underwriting enterprises, such as insurance companies and managing general underwriters, to secure protection or reinsurance from another insurance company for a specific risk or class of risks, including negotiating rates and terms and while sourcing the best-suited contracts available on the market. Additionally, through Gallagher Securities, Gallagher Re provides capital markets services, including acting as underwriter, with respect to insurance-linked securities, weather derivatives, capital raising and selected merger and acquisition advisory activities. We anticipate growing Gallagher Re by increasing the number of underwriting enterprise clients, deepening our relationships with current underwriting enterprise clients, developing new products, further building out our facultative capabilities, and through mergers and acquisitions. Wholesale Insurance Brokerage Operations Our wholesale insurance brokerage operations accounted for 13% of our brokerage segment revenues in 2025. Our wholesale brokers assist our retail brokers and other non-affiliated brokers in the placement of specialized and hard-to- place insurance. These brokers operate through approximately 149 offices primarily located across the U.S., Bermuda and through our approved Lloyd's of London brokerage operation. More than 75% of our wholesale brokerage revenues comes from non-affiliated brokerage clients. In certain cases we act as a brokerage wholesaler, and in other cases we act as a managing general agent or managing general underwriter, distributing specialized insurance coverages for underwriting enterprises. Managing general agents and managing general underwriters are agents authorized by an underwriting enterprise to manage all or a part of its business in a specific geographic territory. Activities they perform on behalf of the underwriting enterprise may include marketing, underwriting (although we do not assume any underwriting risk), issuing policies, collecting premiums, appointing and supervising other agents, paying claims and negotiating reinsurance. We believe our growth prospects for our wholesale brokerage operations depend on increasing the number of broker- clients, developing new managing general agency and underwriter programs, and through mergers and acquisitions. Captive Underwriting Enterprises We have ownership interests in several underwriting enterprises based in the U.S., Bermuda, Gibraltar, Guernsey and Isle of Man that primarily operate segregated account "rent-a-captive" facilities. These "rent-a-captive" facilities enable our clients to receive the benefits of participating in a captive underwriting enterprise without incurring certain disadvantages of ownership. In Malta and Ireland, we act as managers of underwriting enterprises. We also have a wholly owned underwriting enterprise subsidiary based in the U.S. that cedes all of its insurance risk of loss to reinsurers or captives under facultative and quota-share treaty reinsurance agreements. Risk Management Segment Our risk management segment accounted for 13% of our revenues in 2025. Approximately 59% of our risk management segment's revenues are from workers' compensation-related claims, 34% are from general and commercial auto liability- related claims and 7% are from property-related claims in 2025. 7

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Risk management services are primarily marketed on an independent basis from our brokerage operations, to Fortune 1000 companies, larger middle-market companies, nonprofit organizations, public sector entities, and underwriting enterprises, such as insurance carriers and captives. We manage our third party claims adjusting operations through a network of more than 40 offices located throughout Australia, Canada, New Zealand, the U.K. and the U.S. Most of these offices are fully staffed with claims adjusters and other service personnel. Our adjusters and service personnel act solely on behalf and under the instruction of our clients. While this segment complements our brokerage offerings, approximately 95% of our risk management segment's revenues come from clients not affiliated with our brokerage operations, such as underwriting enterprises and clients of other insurance brokers. We expect that the risk management segment's most significant growth prospects through the next several years will come from: • Program business and the outsourcing of portions of underwriting enterprise claims departments; • Increased levels of business with Fortune 1000 companies; • Larger middle-market companies and captives; and • Mergers and acquisitions. Corporate Segment The corporate segment reports the financial information related to our debt, external acquisition-related expenses, other corporate costs, the impact of foreign currency remeasurement and clean energy investments. As a result, the timing of acquisitions impact the trends in our quarterly operating results. Competition Brokerage Segment The insurance and reinsurance brokerage and consulting businesses are highly competitive and there are many organizations and individuals throughout the world who actively compete with us in every area of our business. Additionally, we also face competition from insurance and reinsurance carriers that market, distribute and service a portion of their products directly, and in some cases from banks, consulting and accounting firms, and technology companies that can provide alternative risk management products or services. We believe that the primary factors determining our competitive position with other organizations in our industry are the quality of the services we offer, the personalized attention we provide, the individual and corporate expertise providing the actual service to the client, the data analytics and technology capabilities we have built, the overall cost efficiencies we create for our clients, and our ability to address client needs across the insurance value chain by leveraging our capabilities in insurance, reinsurance, alternative risk transfer, management and administrative services, benefits consulting and claims management. We provide sophisticated data analysis and other data and benchmarking insights through a product offering we refer to as Gallagher Drive to help our clients make insurance decisions. Through our SmartMarket platform, we also provide insurance carriers with individualized preference setting and risk identification capabilities, as well as performance data and metrics. We believe these capabilities provide a growing competitive advantage with respect to many of the smaller organizations with which we compete. Risk Management Segment Our risk management business competes with a number of companies varying in size and scope, including global independent third party claims administrators, regional third party claims administrators, insurance owned claims administrators and legal firms in certain jurisdictions. We believe that the primary factors determining our competitive position are our ability to deliver better outcomes, reputation for outstanding service, cost-efficient service, our data analytics capabilities and financial strength. 8

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Business Combinations We completed approximately 780 acquisitions from January 1, 2002 through December 31, 2025. The majority of these acquisitions have been smaller regional or local brokerages, agencies, or employee benefit consulting operations with a middle or small client focus and/or significant expertise in one of our niche/practice groups. The total purchase price for individual acquisitions has typically ranged from $1 million to $100 million. During 2025, we also completed several acquisitions that were larger than our usual tuck-in acquisitions, namely the acquisitions of Woodruff Sawyer and AssuredPartners, within our brokerage segment. Through these acquisitions, we seek to expand our talent pool, enhance our geographic presence and service capabilities, or further diversify our business mix. We also focus on identifying: • A corporate culture that matches our sales-oriented and ethics-based culture; • A profitable, growing business whose ability to compete would be enhanced by gaining access to our greater resources; and • Clearly defined financial criteria. See Note 3 to our 2025 consolidated financial statements for a summary of our 2025 acquisitions, the amount and form of the consideration paid and the dates of acquisitions. Clients Our client base is highly diversified and includes commercial, industrial, public sector, religious and nonprofit entities, as well as underwriting enterprises in our reinsurance operations and risk management segment. In 2025, our largest single client represented approximately 1% and our ten largest clients together represented approximately 3%, respectively, of our combined brokerage and risk management segment revenues. Human Capital As of December 31, 2025, we had approximately 72,000 employees, with approximately 47% in the U.S. and 53% outside of the U.S. Approximately 77% of our employees work in our brokerage segment and 15% in our risk management segment. Our remaining employees work in our corporate segment, primarily at our headquarters and at Gallagher Centers of Excellence in India. In 2025, our total compensation expense was $6,660 million for the brokerage segment and $974 million for the risk management segment, representing 55% and 61%, respectively, of brokerage and risk management segment revenues. Additional information regarding compensation expense, both on a reported and an adjusted basis can be found elsewhere in this report under Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations. Talent Development and Retention While many of our new employees come to us through mergers and acquisitions and traditional hiring, "growing our own" has long been a key part of our human capital strategy. The Gallagher North American Sales Internship Program has been a key part of our talent development strategy for 60 years. During that time, our program has grown globally and we employed approximately 500 interns in the summer of 2025. We provide our interns with professional development and on-the-job sales training that gives them the opportunity to cultivate expertise and accelerate their full-time sales career growth. We invest in our employees and aim to offer competitive compensation and benefits packages. We acknowledge the changing work landscape and promote hybrid work arrangements, aiming to provide our employees with flexibility and work-life balance. Further, we conduct periodic global engagement surveys that have had increasingly strong participation and positive results. We aim to foster an environment that values and leverages the talents, perspectives and ideas of all employees so they can reach their fullest potential. As of December 31, 2025, approximately 58% of our employees were women, including 50% of managers and 39% of producers. In the U.S., approximately 26% of our employees were racially/ethnically diverse, including 18% of managers and 20% of producers. Employee Learning and Development We have programs around the world that offer learning and development opportunities to our employees. For example, the Achieve and Gallagher Career Associate Programs are career development programs available in North America that combine formal training, with experiential learning to provide participants the knowledge needed to be successful 9

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as client service and sales professionals, respectively. Similarly, we offer development programs outside the U.S., for example in Australia, Canada, India, New Zealand and the U.K. In addition, we provide on-demand access to over 35,000 globally accessible business skills training modules across 18 languages. Regulation Many of our activities throughout the world, such as our insurance brokerage, securities broker-dealer and investment advisory services, are subject to supervision and regulations promulgated by regulatory or self-regulatory bodies such as the SEC, the NYSE, the U.S. Department of Justice (which we refer to as the DOJ), the IRS, the Federal Trade Commission (which we refer to as the FTC) the Financial Industry Regulatory Authority (which we refer to as the FINRA) and the Financial Crimes Enforcement Network in the U.S., the Financial Conduct Authority in the U.K. (which we refer to as the FCA) in the U.K., the Australian Securities and Investments Commission in Australia and insurance regulators in nearly every jurisdiction in which we operate. Our retirement-related consulting and investment advisory services are subject to pension law and financial regulation in many countries. Our activities are also subject to a variety of other laws, rules and regulations addressing, licensing, cybersecurity, data privacy, AI, wage-and-hour standards, employment and labor relations, competition, anti-corruption, currency, the conduct of business, reserves and the amount of local investment with respect to our operations in certain countries. For example, the DOJ updated its guidance on corporate compliance programs to include AI risk management. The global nature of our operations increases the complexity and cost of compliance with laws and regulations, including increased staffing needs, the development of new policies, procedures and internal controls and providing training to employees in multiple locations, adding to our cost of doing business. Many of these laws and regulations may have differing or conflicting legal standards across jurisdictions, increasing further the complexity and cost of compliance. We experience substantial geopolitical and regulatory changes on a real-time basis, which may lead to uncertainty and increase the complexity, difficulty, and cost of compliance. In emerging markets and other jurisdictions with less developed legal systems, local laws and regulations may not be established with sufficiently clear and reliable guidance to provide us with adequate assurance that we are aware of all necessary licenses to operate our business, that we are operating our business in a compliant manner, or that our rights are otherwise protected. In addition, major political and legal developments in jurisdictions in which we do business may lead to new regulatory costs and challenges. For example, China has in place a "blocking" statute similar to that of the European Union (which we refer to as the E.U.) requiring compliance with certain Chinese laws if they conflict with U.S. laws. Rising global tensions and protectionism may also lead other countries to adopt similar blocking statutes, which could make it more difficult and costly for us to expand our operations globally. In addition, climate change and sustainability issues remain a significant focus for investors, clients and other business partners, while regulatory approaches across jurisdictions continue to vary widely. Some jurisdictions, such as the U.K, Australia and the State of California, are intensifying regulation and enforcement with respect to climate-related disclosures, where others are moving towards deregulation – for example, at the U.S. federal level the SEC abandoned the defense of the climate-related disclosures rule and the E.U. approved the Omnibus I directive that reduced significantly the entities subject to, and the requirements of, the Corporate Sustainability Reporting Directive (which we refer to as CSRD) and the Corporate Sustainability Due Diligence Directive (which we refer to as CSDDD). Navigating these inconsistent and evolving rules may demand substantial effort and resources. Available Information Our executive offices are located at 2850 Golf Road, Rolling Meadows, Illinois 60008-4050, and our telephone number is (630) 773-3800. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act, are available free of charge on our website at http://investor.ajg.com/sec-filings as soon as reasonably practicable after electronically filing or furnishing such material to the SEC. The SEC also maintains a website (www.sec.gov) that includes our reports, proxy statements and other information. Unless expressly noted, the information on our website, including our investor relations website, or any other website is not incorporated by reference in this Form 10-K and should not be considered part of this Form 10-K or any other filing we make with the SEC. 10

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Item 1A. Risk Factors. Risk Factor Summary Risks Relating to our Business Generally • Global economic and geopolitical events, such as fluctuations in interest and inflation rates; geo-economic fragmentation and protectionism; a recession or economic downturn; a U.S. government shutdown or political violence; and instability, including as a result of armed conflicts in Ukraine, the Middle East, Latin America and the Caribbean could adversely affect our results of operations and financial condition. • Economic conditions that result in financial difficulties for underwriting enterprises or lead to reduced risk-taking capital capacity could adversely affect our results of operations and financial condition. • We have historically acquired large numbers of insurance brokers, benefit consulting firms and, to a lesser extent, third party claims administration and risk management firms. We may not be able to continue such an acquisition strategy in the future and there are risks associated with such acquisitions, which could adversely affect our growth and results of operations. • Damage to our reputation and culture could have a material adverse effect on our business. • Our sustainability aspirations, goals and initiatives, and our public statements and disclosures regarding them, expose us to numerous risks. • If we are unable to apply technology, data analytics and AI effectively in driving value for our clients through technology-based solutions or gain internal efficiencies and effective internal controls through the application of technology and related tools, our operating results, client relationships, organic and inorganic growth and compliance programs could be adversely affected. • We are subject to risks associated with AI. • Our success depends, in part, on our ability to attract and retain qualified talent, including our senior management team. • Business disruptions could have a material adverse effect on our operations, damage our reputation and impact client relationships. • Our business or reputation could be harmed by our reliance on third-party providers. • Sustained increases in compensation expense and the cost of employee benefits could reduce our profitability. • Our substantial operations outside the U.S. expose us to risks different than those we face in the U.S. • Changes in tax laws could adversely affect us. • We face significant competitive pressures in each of our businesses. • Volatility or declines in premiums or other adverse trends in the insurance industry may seriously undermine our profitability. • Contingent and supplemental revenues we receive from underwriting enterprises are less predictable than standard commission revenues, and any decrease in the amount of these forms of revenue could adversely affect our results of operations. • We face a variety of risks in our benefit consulting operations distinct from those we face in our insurance brokerage operations. • We face a variety of risks in our third-party claims administration operations that are distinct from those we face in our brokerage and benefit consulting operations. 11

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Regulatory, Legal and Accounting Risks • Improper disclosure of confidential, personal or proprietary information and cybersecurity attacks or other security breach of our information systems, or those of third-party vendors we rely on, could result in regulatory scrutiny, legal liability or reputational harm, and could adversely affect our business, financial condition and reputation. • We are subject to a number of contingencies and legal proceedings which, if determined unfavorably to us, would adversely affect our financial results. • Changes in data privacy and protection laws and regulations, or any failure to comply with such laws and regulations, could adversely affect our business and financial results. • We could be adversely affected by violations or alleged violations of laws that impose requirements for the conduct of our overseas operations, including the FCPA, the U.K. Bribery Act or other anti-corruption laws, sanctions laws, and FATCA. • We are subject to regulation worldwide. If we fail to comply with regulatory requirements or if regulations change in a way that adversely affects our operations, we may not be able to conduct our business, or we may be less profitable. • Changes in our accounting estimates and assumptions could negatively affect our financial position and operating results. • Limited protection of our intellectual property could harm our business and our ability to compete effectively, and we face the risk that our services or products may infringe upon the intellectual property rights of others. Risks Relating to our Investments, Debt and Common Stock • Our clean energy investments are subject to various risks and uncertainties. • The IRC Section 45 operations in which we have invested and the by-products from such operations may result in environmental and product liability claims and environmental compliance costs. • We have debt outstanding that could adversely affect our financial flexibility and subjects us to restrictions and limitations that could significantly impact our ability to operate our business. • Credit rating downgrades would increase our financing costs and could subject us to operational risk. • We are a holding company and, therefore, may not be able to receive dividends or other distributions in needed amounts from our subsidiaries. • Future sales or other dilution of our equity could adversely affect the market price of our common stock. Risks Relating to our Business Generally Global economic conditions and geopolitical events may impact the countries, regions or industries in which we operate and adversely affect our business results of operations and financial condition. Global economic and geopolitical events, including fluctuations in interest, inflation and exchange rates, geo-economic fragmentation and protectionism resulting in greater restrictions on international trade and market uncertainty, tariffs, trade wars and other governmental actions affecting the flow of goods, services or currency, military actions and war, including between Russia and Ukraine, the Middle East, Latin America and the Caribbean, political crises like U.S. governmental shutdowns, and political violence and instability worldwide could also weigh negatively on the economy. A recession or decline in economic activity, for these and any other reasons, could adversely impact us in future periods. For example, our clients might reduce the amount of insurance coverage, reinsurance coverage, consulting services or claims administration services they purchase due to reductions in headcount, payroll, or replacement and asset values, among other factors. Whether these reductions are caused by an overall economic downturn or declines in certain countries, regions and industries in which we operate, our commission and fee revenues, consulting revenues, or revenues 12

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from managing third-party insurance claims could be adversely impacted. Some of our clients may also experience liquidity problems or other financial difficulties due to tightening credit markets or lower levels of economic activity. If our clients file for bankruptcy, liquidate their operations, consolidate or are generally unable to meet their obligations, our revenues, ability to collect receivables and liquidity could be adversely impacted, which could have an adverse effect on our results of operations and financial condition. While lower interest rates benefit us by reducing our cost of borrowing, they also reduce investment earnings on our cash, revenue from our premium financing operations and short-term investments of fiduciary and operating funds. In addition, lower levels of inflation may reduce our revenue growth by slowing the increase in insurable asset values. Uncertain economic conditions have created volatility in the U.S. and other markets where we operate. A rise in the cost of labor or cost of capital, among other things, could negatively impact our operating and general and administrative expenses. We have no or limited control over such developments. If our costs grow significantly, our margins and results of operations may be materially and adversely impacted and we may not be able to achieve our strategic and financial objectives. Further, a tightening of credit or capital markets could negatively impact our business, financial condition and liquidity, including our ability to continue to access preferred sources of liquidity when needed and under similar terms, which may increase our capital costs. We could also experience losses on holdings of cash and investments due to failures of financial institutions and other counterparties. Thus, a deterioration in macroeconomic conditions could adversely affect our business, results of operations or financial condition. Economic conditions that result in financial difficulties for underwriting enterprises or lead to reduced risk-taking capital capacity could adversely affect our results of operations and financial condition. We have a significant amount of receivables from certain of the underwriting enterprises with which we place insurance and reinsurance. If those companies experience liquidity problems or other financial difficulties, we could encounter delays or defaults in payments owed to us, which could have a significant adverse impact on our consolidated financial condition and results of operations. The failure of an underwriting enterprise with which we place business could result in E&O claims against us by our clients. Further, the failure of E&O underwriting enterprises could make the E&O insurance we rely upon cost prohibitive or unavailable. Underwriting enterprises are also clients of our reinsurance and third-party claims administration operations and, as such, any of the negative developments for underwriting enterprises referred to above could also reduce our commission and fee revenues from such clients. Any of these developments could adversely affect our results of operations and financial condition. In addition, if underwriting enterprises merge, fail, or withdraw from offering certain lines of coverage, for example, because of large payouts related to natural or man-made disasters, climate or weather events, or other emerging risk areas, overall risk-taking capital capacity could be negatively affected, which could reduce our ability to place certain lines of coverage, reduce demand from the insurance company clients of our reinsurance and third-party claims administration operations and, as a result, reduce our revenues and profitability. We have historically acquired large numbers of insurance brokers, benefit consulting firms and, to a lesser extent, third party claims administration and risk management firms. We may not be able to continue such acquisition strategy in the future and there are risks associated with such acquisitions, which could adversely affect our growth and results of operations. Our acquisition program has been an important part of our historical growth, particularly in our brokerage segment, and we believe that similar acquisition activity will be important to maintaining comparable growth in the future. Failure to successfully identify and complete acquisitions would likely result in slower growth. Continuing consolidation in our industry and a high level of interest in acquiring insurance brokers on the part of private equity firms, private equity-backed consolidators and newly public insurance brokers has, in some cases, made, and could in the future make, appropriate acquisition targets more difficult to identify and more expensive. Even if we are able to identify appropriate acquisition targets, we may not have sufficient capital to fund acquisitions, be able to execute transactions on favorable terms or integrate targets in a manner that allows us to realize the benefits we have historically experienced from acquisitions. When regulatory approval of acquisitions is required, our ability to complete acquisitions may be limited by an ongoing regulatory review or other issues with the relevant regulator. Our ability to finance and integrate acquisitions may also decrease if we complete a greater number of larger acquisitions than we have historically. See the paragraph below regarding larger acquisitions. See also Note 3 to our 2025 consolidated financial statements for information regarding the size of transactions in the reporting period. Post-acquisition risks include poor cultural fit and risks relating to retention of personnel, retention of clients, entry into unfamiliar or complex markets or lines of business, contingencies or liabilities not covered by or in excess of escrowed or indemnified amounts (such as those arising from unlawful sales practices and violations of sanctions laws or anti- corruption laws including the FCPA and U.K. Bribery Act), risks relating to ensuring compliance with licensing and regulatory requirements, tax and accounting issues, the risk that an acquisition distracts management and personnel from our existing business, and integration difficulties relating to accounting, information technology (which we refer to as IT), 13

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pay equity, or human resources, some or all of which could have an adverse effect on our results of operations and growth. The failure of acquisition targets to achieve anticipated revenue and earnings levels could result in goodwill impairment charges. Additionally, through our acquisitions, we may enter new lines of business or offer new services within existing lines of business. For example, our acquisitions of Woodruff Sawyer and Caytons Law added legal consulting services related to directors' and officers' liability insurance and a U.K.-based claims and legal solutions firm. These new businesses may pose additional risks or increased regulatory burden. Integration efforts relating to larger acquisitions (including, for example, AssuredPartners, the largest acquisition in our history) are more complex, including with respect to technology systems, which may divert management's attention and resources and could adversely affect our operating results. In addition, we have made certain assumptions relating to these acquisitions that may be inaccurate, including as a result of the failure to realize expected benefits, higher than expected integration costs and unknown liabilities as well as general economic and business conditions. These assumptions relate to various matters, including projections of future revenues, non-GAAP measures, expenses and expense allocation; our ability to maintain, develop and deepen relationships with employees, including key brokers, and clients; the amount of goodwill and intangibles; our ability to realize anticipated cost savings and revenue synergies; and other unforeseen compliance, financial and strategic risks. Damage to our reputation or culture could have a material adverse effect on our business. Our reputation is one of our key assets. We advise our clients on and provide services related to a wide range of subjects and our ability to attract acquisition partners and attract and retain clients and employees is highly dependent upon perceptions of our expertise, level of service, ability to protect client information, trustworthiness, business practices, financial condition and other subjective qualities such as ethics, culture and values. We believe that our culture has been a critical component of our growth and success since our founding nearly 100 years ago and the failure to uphold our culture as we grow could negatively impact our reputation. Negative perceptions or publicity, including our association with clients or business partners with damaged reputations, as a result of actions taken by companies we acquire before the acquisition, as a result of marketing partnerships (for example, with a sports team or league), or from actual or alleged conduct by us or our employees, including corruption or bribery allegations or cybersecurity incidents, could damage our reputation. Negative publicity may be posted on social media or other Internet forums, whether or not true, and the speed and pervasiveness with which information can be disseminated through these channels, in particular social media, may magnify the risks noted above. Our success is also dependent on maintaining a good reputation with investors, regulators and the communities in which we operate. As we enter new jurisdictions and markets globally, negative reputational events (whether arising from regulatory matters or otherwise) may have a disproportionate impact in locations or markets where our employee and client presence is limited. Any negative publicity could potentially hinder our growth prospects in such locations or markets. Any of these matters could have a material adverse effect on our business, financial condition and results of operations. See below for additional risk factors regarding sustainability initiatives and disclosures. Our sustainability-related aspirations, goals and initiatives, and our statements and disclosures regarding sustainability expose us to numerous risks. Differing views and regulatory approaches regarding sustainability have made compliance with regulations, frameworks and stakeholder expectations increasingly complex and subject to risk. Our sustainability-related aspirations, goals and initiatives face scrutiny from the investment community, regulators, current and potential clients, employees, potential acquisition targets, and other stakeholders related to sustainability. This includes scrutiny regarding our goal to reach operational net zero carbon emissions (Scope 1 and Scope 2) by 2050 and our interim goal of a 50% reduction in such emissions, on a per employee basis, by 2030. We anticipate the same level of scrutiny with respect to any other goals, targets and objectives we may announce in the future, and our methodologies and timelines for pursuing them. We could become the target of litigation, investigations or public criticism alleging that our sustainability efforts are anti- competitive, discriminatory or otherwise unlawful. For example, the State of Texas recently issued an opinion on the legality of corporate diversity, equity and inclusion (DEI) programs taking the position that such programs are potentially unlawful under certain circumstances. On the other hand, our failure or perceived failure to pursue or fulfill our sustainability-related goals, targets and objectives, to comply with ethical, social, environmental or other standards, regulations or expectations, or to satisfy various sustainability reporting standards, which vary widely across different jurisdictions, could also make us the target of litigation, investigations or public criticism. Any resulting erosion of trust and confidence could make it difficult for us to attract acquisition targets or attract and retain clients, employees or investors; result in lower sustainability ratings, exclusion of our stock from sustainability-oriented indices, and reduced demand for our stock from sustainability-focused or anti-ESG investment funds; increase our cost of borrowing; or harm our relationships with regulators and the communities in which we operate. See also "We are subject to regulation worldwide. If we fail to comply with regulatory requirements or if regulations change in a way that adversely affects our operations, we may not be able to conduct our business, or we may be less profitable." 14

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If we are unable to apply technology and data analytics effectively in driving value for our clients through technology-based solutions or gain internal efficiencies and effective internal controls through the application of technology and related tools, our operating results, client relationships, ability to attract acquisition targets, growth and compliance programs could be adversely affected. Our future success depends, in part, on our ability to collect and leverage data relating to our business and otherwise anticipate and respond effectively to the risks and opportunities presented by digital disruption, "big data" and data analytics, AI and other developments in technology. These may include new applications or insurance-related services based on AI (e.g., generative AI, machine learning), robotics, blockchain, or new approaches to data mining that impact the nature of how we generate revenue. We may be exposed to competitive risks related to the adoption and application of new technologies by established market participants (for example, through disintermediation) or new entrants such as technology companies, "Insurtech" start-up companies, and others. These new entrants are focused on using technology and innovation in an attempt to simplify and improve the client experience, increase efficiencies, alter business models and effect other potentially disruptive changes in the industries in which we operate. We must also develop and implement technology solutions and technical expertise among our employees that anticipate and keep pace with rapid and continuing changes in technology, industry standards, client preferences and internal control standards. We may not be successful in anticipating or responding to these developments on a timely and cost-effective basis and our ideas may not be accepted in the marketplace. Additionally, the effort to gain technological expertise, make use of data analytics, and develop new technologies in our business requires us to incur significant expenses. Investments in technology systems and data analytics capabilities may not deliver the benefits or perform as expected, or may be replaced or become obsolete more quickly than expected, which could result in operational difficulties or additional costs. If we cannot offer new technologies or data analytics solutions as quickly as our competitors, or if our competitors develop more cost-effective technologies, data analytics solutions or other product offerings, we could experience a material adverse effect on our operating results, client relationships, ability to attract acquisition targets, growth, and compliance programs. In some cases, we depend on key third-party vendors and partners to provide technology and other support for our strategic initiatives. If these third parties fail to perform their obligations or cease to work with us, our ability to execute on our strategic initiatives could be adversely affected. See also "We are subject to risks associated with AI." We are subject to risks associated with AI. We use AI in our business, including with respect to services provided to our clients. We have internal policies and controls governing development, procurement, deployment and the use of AI by our employees designed to align with globally recognized AI principles, maintain trust with clients and protect the company from cybersecurity threats, breaches of data privacy and intellectual property, E&O liability and regulatory enforcement risk; however, our employees could violate these policies and they or external threat actors could circumvent our controls and expose us to such risks. Furthermore, our exposure to these risks may increase if our vendors, suppliers, or other third-party providers employ AI in relation to the products or services they provide to us, as we have limited control over such use in third-party products or services. These risks include, among others, the input of confidential information, including material non-public information, in contravention of our policies or contractual restrictions to which any of the foregoing are subject, or in violation of applicable laws or regulations, including those relating to data protection and AI. This could result in such information becoming part of a data set that is accessible by other third-party AI applications and users. Additionally, AI heavily relies on the collection and analysis of extensive data sets. The third-party models underlying our AI tools may be inadequately designed, implemented or trained, and due to the impracticality of incorporating all relevant data into the models used by AI, it is inevitable that data sets within these models will contain information that has inaccuracies and errors, and potential biases. This could potentially render such models inadequate or flawed, leading to outputs surfacing third-party intellectual property or that contain information that is biased, unethical, discriminatory, incomplete, inaccurate, misleading or poor-quality that could negatively impact the effectiveness of the technology or our services. We are exposed to the risks associated with these inaccuracies, errors and biases, along with the adverse impacts that such flawed models could have on our business and operations. Furthermore, there is a risk that the use of AI may subject the company to reputational harm and liability related to governance and ethical issues and potential litigation from third-party intellectual property holders. The increasing adoption of AI technologies by cyber threat actors presents a significant and evolving risk to our company. These actors may leverage AI to develop more sophisticated and targeted cyberattacks, including advanced phishing schemes, malware, and data exfiltration techniques, which could compromise our controls and systems, client data, and proprietary information. Such incidents could result in operational disruptions, financial losses, reputational damage, regulatory scrutiny, and potential legal liabilities. As the capabilities of AI-driven threats continue to advance, the complexity and scale of cyber risks we face may increase, necessitating ongoing investment in robust cybersecurity measures and threat mitigation strategies. 15

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AI and its applications are developing rapidly. The use of this technology by our clients or underwriting enterprises may impact the way our business operates, and its use by our competitors and new market entrants with competing services derived from their AI capabilities may give them a competitive advantage. We cannot predict the effect of these changes at this time. or example, they may decrease the demand for our services or negatively affect our assumptions regarding the competitive landscape of our business. Further, the rapid development of these technologies may require significant efforts to upskill or reskill existing employees. Consequently, it is difficult to predict all risks associated with this new technology, which may eventually impact our business, results of operations, or financial condition. See also "Changes in data privacy and protection laws and regulations, or any failure to comply with such laws and regulations, could adversely affect our business and financial results." Our success depends, in part, on our ability to attract and retain qualified talent, including our senior management team. We depend upon members of our senior management team, who possess extensive knowledge and a deep understanding of our business and strategy. We could be adversely affected if we fail to successfully execute our succession plans for these leaders, including our chief executive and chief financial officers, and if our succession plans are not well-received by our employees, trading partners, investors and other stakeholders. Additionally, members of our senior management team face the risk of cybersecurity and physical threats that, if carried out, could adversely affect our business. We could be adversely affected if we fail to attract and retain talent and foster a diverse and inclusive workplace throughout our organization. Competition for talent is intense in many areas of our business, particularly in our claims management business, IT and in rapidly developing fields such as AI and data engineering. The prevalence of remote working arrangements has expanded the pool of companies that compete with us for talent. As competition for skilled professionals remains intense, employers are implementing new offerings to attract talent, including but not limited to increasing compensation, enhancing health and wellness solutions, and providing remote work options. We may have to devote significant resources to attract and retain talent, which could negatively affect our business, operating results and financial condition. Our industry has experienced competition for brokers and in the past we have lost key brokers and groups of brokers, along with their clients, business relationships and intellectual property directly to our competition. We enter into agreements with many of our brokers and significant client-facing employees and all of our executive officers, which prohibit them from disclosing confidential information and/or soliciting our clients, prospects and employees upon their termination of employment. The confidentiality and non-solicitation provisions of such agreements terminate in the event of a hostile change in control, as defined in the agreements. Although we pursue legal actions for alleged breaches of such agreements, theft of trade secrets, breaches of fiduciary duties, intellectual property infringement and related causes of action, such legal actions may not be effective in preventing such breaches, theft or infringement. In certain cases, our competitors have solicited employees in violation of their employment agreements as a matter of standard business practice, apparently determining that the cost of defending litigation is outweighed by the benefits of acquiring our employees in this manner. Certain states like Minnesota, North Dakota, Oklahoma and Wyoming have implemented rules that would prevent employers from entering into non-competes with employees, while California has broadened the scope of its longstanding restrictions on non-competes. If more states adopt similar rules or if we fail to adequately address any of the issues referred to above, we could experience a material adverse effect on our business, operating results and financial condition. Business disruptions could have a material adverse effect on our operations, damage our reputation and impact client relationships. Our ability to conduct business may be adversely affected by a disruption in the infrastructure that supports our business. This includes infrastructure controlled by third-party vendors and suppliers. Such disruptions could be caused by various factors, such as cybersecurity incidents, security breaches, human error, capacity constraints, hardware failures or defects, natural or man-made disasters, climate and weather events, pandemics, fires, power outages, telecommunication failures, break-ins, sabotage, intentional acts of vandalism, acts of terrorism, civil disruption, political violence and unrest, military actions or war. While we have disaster recovery procedures in place, they may not be effective. Additionally, insurance covering such disruptions may not continue to be available at reasonable prices and may not address all potential losses or compensate us for the possible loss of clients or increase in claims and lawsuits against us. Further, because we do not control infrastructure owned by third parties, we cannot guarantee that such parties have effective recovery procedures, or sufficient funds or insurance to recover any damages, losses or other liabilities that we may incur due to business interruptions caused by disruptions to their infrastructure. The risk of business disruption is more pronounced in certain geographic areas where a significant portion of our business is concentrated. For example, we have substantial operations in India that provide important client support and other services for our global organization. To date, the dispute between India and Pakistan involving the Kashmir region, rising tensions between India and China, incidents of terrorism in India, the potential for civil unrest and general geopolitical 16

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uncertainties have not adversely affected our operations in India. However, such factors could potentially affect our operations there in the future. If our access to these services is disrupted, our client relationships could be harmed, our liability for E&O could increase, and our reputation could be damaged, adversely affecting our business, operating results and financial condition. Our business or reputation could be harmed by our reliance on third-party providers. While we maintain some of our critical information technology systems, we are dependent on third-party providers of information technology systems and services, as well as other non-IT services, to meet the needs of our business and our clients around the world. As we do not fully control the actions of these third parties, we are subject to the risk that their decisions, actions, or inactions may adversely impact us, and replacing these service providers could create significant delay and expense. There is a risk that our third-party providers could engage in business practices that are prohibited by our internal policies or violate applicable laws and regulations. A failure by third parties to comply with service-level agreements or regulatory or legal requirements in a high-quality and timely manner, particularly during periods of our peak demand for their services, could result in economic and reputational harm to us. These third parties face their own technology, operating, business and economic risks, and any significant failures by them, including the improper use or disclosure of our confidential client, employee or company information, could cause harm to our business and reputation. An interruption in or the cessation of service by any service provider as a result of systems failures, cybersecurity incidents, capacity constraints, financial difficulties, or for any other reason could disrupt our operations, impact our ability to offer certain products and services, and result in contractual or regulatory penalties, liability claims from clients or employees, damage to our reputation, and harm to our business. See also "Business disruptions could have a material adverse effect on our operations, damage our reputation and impact client relationships." Sustained increases in compensation expense and the cost of employee benefits could reduce our profitability. Compensation expense and the cost of employees' medical and other employee benefits, substantially affect our profitability. In the past, we have occasionally experienced significant increases in these costs as a result of macro- economic factors beyond our control, including wage inflation and increases in health care costs. In 2025, our health care costs rose by approximately 20% compared to 2024 (includes impact of inflation, increased utilization and increased headcount) and our consolidated compensation expense ratio in 2025 as a percent of total consolidated revenue at 56.2% decreased slightly compared to 2024. Although we have actively sought to control increases in compensation expense and the cost of employee benefits, we can make no assurance that we will succeed in limiting future cost increases, and continued upward pressure in these costs could reduce our profitability. Our substantial operations outside the U.S. expose us to risks different than those we face in the U.S. In 2025, we generated approximately 33% of our combined brokerage and risk management revenues outside the U.S. Our business outside the U.S. presents operational, regulatory, economic and other risks that are different from, or greater than, the risks we face doing comparable business in the U.S. These include, among others, risks relating to: • Maintaining awareness of and complying with a wide variety of labor practices and foreign laws, including those relating to labor and employment, data privacy requirements, AI regulations, prohibitions on corrupt payments to government officials, export and import duties, environmental policies, sustainability disclosures, as well as laws and regulations applicable to U.S. business operations abroad; • Our employees, agents, or affiliated entities, or their respective officers, directors, employees and agents, may take actions in violation of local laws, regulations or policies, for which we might be held responsible. Actual or alleged violations could result in substantial fines, sanctions, civil or criminal penalties, debarment from government contracts, curtailment of operations in certain jurisdictions, competitive or reputational harm, litigation or regulatory action and other consequences that might adversely affect our results of operations, financial condition or strategic objectives; • We expect relations with work councils and trade unions will continue to be satisfactory. However, work stoppages could occur in countries where such organizations exist and we may not be successful in negotiating new collective bargaining agreements. In addition, collective bargaining negotiations may (1) result in significant increases in the cost of labor, (2) divert management's attention away from operating the business or (3) break down and result in the disruption of operations. See also "Regulatory, Legal and Accounting Risks"; • We own interests in firms where we do not exercise management control (such as Casanueva Perez S.A.P.I. de C.V. in Mexico and Renomia, A.S. in the Czech Republic) and 17

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are therefore unable to direct or manage the business to realize the full range of benefits, including mitigation of risks, that could be achieved through full ownership; • The potential costs, difficulties and risks associated with local regulations across the globe, including the risk of personal liability for directors and officers (for example, in the U.K.) and "piercing the corporate veil" risks under the corporate law regimes of certain countries; • Difficulties in staffing and managing foreign operations. For example, we are growing our Latin America operations through acquisitions of local family-owned insurance brokerage firms. If we lose a key local employee, hiring and retaining talent locally or finding an internal candidate qualified to transfer to such location could be difficult; • Less flexible employee relationships, which in certain circumstances have limited our ability to prohibit employees from competing with us after they are no longer employed with us or recover damages, and made it more difficult and expensive to terminate their employment; • Conflicting regulations in the countries in which we do business; • Political and economic instability (including risks relating to undeveloped or evolving legal systems, unstable governments, acts of terrorism, military actions and war, including between Russia and Ukraine, the Middle East and Latin America and the Caribbean). See also "Global economic conditions and geopolitical events may impact the countries, regions or industries in which we operate and adversely affect our business, results of operations and financial condition"; • Coordinating our communications, policies and logistics across geographic distances, multiple time zones and in different languages, including during times of crisis management; • Risks relating to our post-Brexit plan to address the loss of passporting rights between the U.K. and the European Economic Area (which we refer to as EEA) with respect to insurance brokerage services. The plan we implemented in 2020 involved transferring the EEA clients of our U.K.-based regulated entities to a Swedish subsidiary authorized in the EEA, and providing some services through a U.K. branch of such subsidiary. Although this "reverse branch" model is typical of other brokers of a similar size, EEA, regulators continue to assess their approach to this model, including as a result of, among other developments, the supervisory statement issued by the European Insurance and Occupational Pensions Authority (EIOPA) in February 2023. While we are continuously assessing the impact of these developments, it is difficult to predict such impact on our current plan; • Unfavorable audits and exposure to additional liabilities relating to various non-income taxes (such as payroll, sales, use, value-added, net worth, property and goods and services taxes) in non-U.S. jurisdictions. In addition, our future effective tax rates could be unfavorably affected by changes in tax rates, discriminatory or confiscatory taxation, changes in the valuation of our deferred tax assets or liabilities, changes in tax laws or their interpretation and the financial results of our non-U.S. subsidiaries. See also "Changes in tax laws could adversely affect us"; • Legal or political constraints on our ability to maintain or increase prices; • Cash balances held in foreign banks and institutions where governments have not specifically enacted formal guarantee programs; • Certain of our non-U.S. subsidiaries receive revenues or incur obligations in currencies that differ from their functional currencies. We must also translate the financial results of our non-U.S. subsidiaries into U.S. dollars. Although we have used foreign currency hedging strategies in the past and currently have some in place, such risks cannot be eliminated entirely, and significant changes in exchange rates may adversely affect our results of operations; • Epidemics or pandemics at a regional or global level; 18

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• Lost business or other financial harm due to protectionism in the U.S. and in countries around the world, including adverse trade policies, tariffs, trade wars and other governmental actions affecting the flow of goods, services or currency, and governmental restrictions on the transfer of funds to us from our operations outside the U.S.; for example, the practice of using off-shore labor has come under increased scrutiny in the U.S. and governmental authorities or insurance carriers could seek to impose financial costs or restrictions on the use of off-shore centers of excellence such as the ones we operate in India and other international jurisdictions (see also "Business disruptions could have a material adverse effect on our operations, damage our reputation and impact client relationships"); and • Increased tensions between countries such as the U.S., China and Russia and related trade and military policies of the U.S. government that may cause retaliation or countermeasures from other countries or regions, could further develop in ways that exacerbate the risks described above, or introduce new risks for our non-U.S. operations, such as increasing the potential that sanctions, tariffs, global mobility restrictions or other related measures may impact our business. If any of these risks materialize, our results of operations and financial condition could be adversely affected. Changes in tax laws could adversely affect us. We operate in various jurisdictions and are subject to changes in applicable tax laws, treaties, or regulations in those jurisdictions. A material change in the tax laws, treaties, or regulations, or their interpretation, of any jurisdiction with which we do business, or in which we have significant operations, could adversely affect us. For example, in the Organization for Economic Cooperation and Development (which we refer to as the OECD) continues to issue reports and recommendations as part of its Base Erosion and Profit Shifting project (which we refer to as BEPS) and in 2021, it announced that 136 countries and tax jurisdictions agreed to implement a new Pillar 2 approach to international taxation. Pillar 1 exempts regulated financial institutions and we believe we qualify for such exemption. Many countries in which we do business have adopted, or are expected to adopt, these rules which will change various aspects of the existing framework under which our tax obligations are determined. For example, the U.K., the majority of the E.U., Canada, Australia and New Zealand have now adopted nearly all aspects of these rules with limited variation from the OECD model rules. Other jurisdictions in which we do business also reacted to these efforts; for example, Bermuda enacted a corporate tax regime for the first time in 2023, which became effective in 2025. On January 5, 2026, OECD released additional administrative guidance on the application of Pillar 2 global minimum tax rules, which are designed to ensure that large multinational enterprise (MNE) groups are subject to a minimum effective tax rate of 15% in each jurisdiction in which they operate. This guidance introduces a package of new and expanded safe harbors and simplification measures, including a "side-by-side" safe harbor regime applicable to certain U.S.-parent MNE groups, extensions and modifications to existing transitional safe harbors, and additional rules addressing the treatment of tax incentives and effective tax rate calculations. The most significant element of this guidance is the "side-by-side" safe harbor which is intended to coordinate the Pillar 2 global minimum tax regime with certain domestic minimum tax systems, including those in the U.S. Subject to eligibility requirements and elections, this safe harbor may substantially reduce or eliminate the application of Pillar 2 "top-up taxes," including the Income Inclusion Rule and Undertaxed Profits Rule for affected MNE groups for fiscal years beginning on or after January 1, 2026. These developments, once enacted into domestic law by Pillar 2 adopters, have the potential to significantly de-risk Pillar 2 exposure for U.S. multinationals like Gallagher. Whether those enactments take effect in 2026 or later, they will need to be monitored and anticipated top- ups adjusted to reflect those enactment dates. Regardless of the adoption of this new guidance, the domestic minimum top- up aspect of Pillar 2 (referred to as "QDMTT") and its related compliance aspects will remain for all multinationals that operate in jurisdictions that have enacted it. We anticipate further significant developments across several jurisdictions in which we operate in 2026 and 2027. Should the jurisdictions in which we operate, and those in which we and our subsidiaries are based, choose not to implement the OECD's January 2026 guidance in their tax treaties and domestic tax laws, particularly if the U.S. does not adopt Pillar 2, although we do not anticipate a material financial impact, we could be adversely affected by a top-up. We face significant competitive pressures in each of our businesses. The insurance brokerage, reinsurance brokerage and employee benefit consulting businesses are highly competitive and many insurance brokerage, reinsurance brokerage and employee benefit consulting organizations actively compete with us in one or more areas of our business around the world. Two of the firms we compete with in the global brokerage and risk management markets have larger revenues than ours. In addition, many other smaller firms that operate nationally or that 19

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are strong in a particular country, region or locality may have, in that country, region or locality, an office with revenues as large as or larger than those of our corresponding local office. Our third-party claims administration operation also faces significant competition from stand-alone firms as well as divisions of larger firms. Over the past decade or more, private equity sponsors have invested heavily in the insurance brokerage and third-party claims administration industries, creating new competitors and strengthening existing ones. Across all of our operations, Insurtech and technology-based start-ups are entering the business. In most cases, these businesses complement or enhance our offerings, but in some cases, they compete with us. We believe that the primary factors determining our competitive position with other organizations in our industry are the quality of the services we offer, our data analytics capabilities, the personalized attention we provide, the individual and corporate expertise of the brokers and consultants providing the actual service to the client, our ability to address client needs across the insurance value chain by leveraging our capabilities in insurance, reinsurance, alternative risk transfer, management and administrative services, benefits consulting, and claims management, and our ability to help our clients manage their overall risk exposure and insurance or reinsurance costs. Losing business to competitors offering similar services or products at a lower cost or having other competitive advantages would adversely affect our business. Consolidation among our existing competitors could create additional competitive pressure on us as such firms grow their market share, take advantage of strategic and operational synergies and develop lower cost structures. In addition, any increase in competition due to new legislative or industry developments could adversely affect us. These developments include: • Increased capital-raising by underwriting enterprises, which could result in new risk-taking capital in the industry, which in turn may lead to lower insurance premiums and commissions; • Underwriting enterprises selling insurance directly to insureds without the involvement of a broker or other intermediary; • Changes in our business compensation model as a result of regulatory developments; • Federal and state governments establishing programs to provide health insurance (such as a single-payer system) or, in certain cases, property insurance in catastrophe-prone areas or other alternative market types of coverage, that compete with, or completely replace, insurance products currently offered by underwriting enterprises; • Sustainability regulations in the U.S. and around the world, particularly those promoting the transition to a lower-carbon economy, which could create new competitive pressures around climate resilience consulting services and innovative insurance solutions; • Continued consolidation in the financial services industry, leading to large financial services institutions offering a wider variety of services including insurance brokerage and risk management services; • Increased competition from new market participants such as banks, accounting firms, consulting firms and Internet or other technology firms offering risk management or insurance brokerage services, or new distribution channels for insurance such as payroll firms and professional employer organizations; and • Third-party capital providers entering the insurance and reinsurance risk transfer market offering products and capital directly to our clients. Their presence in the market has increased the competitive pressures that we face. New competition as a result of these or other legislative or industry developments could cause the demand for our products and services to decrease, which could in turn adversely affect our results of operations and financial condition. Volatility or declines in premiums or other adverse trends in the insurance industry may seriously undermine our profitability. We derive much of our revenue from commissions and fees for our brokerage services. We do not determine the premiums on which our commissions are generally based. Moreover, premiums are cyclical in nature and may vary widely based on market conditions. Because of market cycles for insurance and reinsurance product pricing, which we cannot predict or control, our brokerage revenues and profitability can be volatile or remain depressed for significant periods of time. Underwriting enterprises may seek to minimize their expenses by reducing the commission rates payable to agents or brokers such as us. The reduction of these commission rates, along with general volatility and/or declines in premiums, 20

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may significantly affect our profitability. Because we do not determine the timing or extent of premium pricing changes, it is difficult to forecast our commission revenues precisely, including whether they will significantly decline. As a result, we may have to adjust our budgets for future acquisitions, capital expenditures, dividend payments, debt repayments and other expenditures to account for unexpected changes in revenues, and any decreases in premium rates may adversely affect the results of our operations. In addition, there have been and may continue to be various trends in the insurance and reinsurance markets toward alternative insurance markets including, among other things, greater levels of self-insurance, captives, rent-a-captives, risk retention groups and non-insurance capital markets-based solutions to traditional insurance. While historically we have been able to participate in certain of these activities on behalf of our clients and obtain fee revenue for such services, there can be no assurance that we will realize revenues and profitability as favorable as those realized from our traditional brokerage activities. Our ability to generate premium based commission revenue may also be challenged by the growing desire of some clients to compensate brokers based upon flat fees rather than a percentage of premium. This could negatively impact us because fees are generally not indexed for inflation and might not increase with premiums as commissions do or with the level of service provided. Contingent and supplemental revenues we receive from underwriting enterprises are less predictable than standard commission revenues, and any decrease in the amount of these forms of revenue could adversely affect our results of operations. A meaningful portion of our revenues consists of contingent and supplemental revenues from underwriting enterprises. Contingent revenues are paid after the insurance contract period, generally in the first or second quarter, based on the growth and/or profitability of business we placed with an underwriting enterprise during the prior year. On the other hand, supplemental revenues are paid up front, on an annual or quarterly basis, generally based on our historical premium volumes with the underwriting enterprise and additional capabilities or services we bring to the engagement. While underwriting enterprises generally maintain supplemental revenues in the current year at a pre-determined rate, that rate can change in future years as described above. If, due to the current economic environment or for any other reason, we are unable to meet an underwriting enterprise's particular profitability, volume or growth thresholds, as the case may be, or such companies increase their estimate of loss reserves (over which we have no control), actual contingent revenues or supplemental revenues could be less than anticipated, which could adversely affect our results of operations. In the case of contingent revenues, under revenue recognition accounting standards, this could lead to the reversal of revenues in future periods that were recognized in prior periods. We face a variety of risks in our benefit consulting operations distinct from those we face in our insurance brokerage operations. Our benefit consulting operations face a variety of risks distinct from those faced by our brokerage operations. The portion of our revenue derived from consulting engagements and special project work is more vulnerable to reduction, postponement, cancellation or non-renewal during an economic downturn than traditional insurance brokerage commissions. A portion of our benefit consulting operation revenue is tied to assets invested by our clients, and when investment returns are adversely affected that portion of our revenue is negatively impacted. Certain areas within our retirement consulting practice may attract a higher level of regulatory scrutiny due to regulators' historical interest in such matters, including pension-related products and investment advisory and broker-dealer services. In addition, we have made significant investments in product and knowledge development to assist clients as they navigate the complex regulatory requirements relating to employer-sponsored healthcare. New laws or regulations reducing employer-sponsored health insurance, by limiting or eliminating tax-advantaged employer-sponsored benefits or otherwise, could impact clients' demand for our services. If we are unable to adapt our services to changes in the legal and regulatory landscape around employer-sponsored benefits, our results of operations could be adversely impacted. We face a variety of risks in our third-party claims administration operations that are distinct from those we face in our brokerage and benefit consulting operations. Our third party claims administration operations face a variety of risks distinct from those faced by the rest of our business, including the risks that: • Epidemics and pandemics that reduce in-person business activity have a greater negative impact because they result in a reduction in the number of claims processed, as experienced during the years 2020, 2021 and the beginning of 2022. If a new epidemic or pandemic were to emerge, these operations could face similar negative impacts in the future; • RISX-FACS®, our proprietary risk management information system, on which our ability to provide clients with insurance claim settlement and administration services is highly dependent, becomes inoperable for some reason. In addition, we are increasing our use of 21

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cloud storage and cloud computing application services supported, upgraded and maintained by third-party vendors. A disruption affecting RISX-FACS®, third-party cloud services or any other infrastructure supporting our business, including key client relationship management software, could have a material adverse effect on our operations, cause reputational harm and damage our employee and client relationships; • The favorable trend among both underwriting enterprises and self-insured entities toward outsourcing various types of claims administration and risk management services will reverse or slow, causing our revenues or revenue growth to decline; • Concentration of large amounts of revenue with certain clients results in greater exposure to the potential negative effects of lost business due to changes in management at such clients or changes in state government policies, in the case of our government-entity clients, or for other reasons; • Contracting terms will become less favorable or the margins on our services will decrease due to increased competition, regulatory constraints or other developments; • We do not satisfy regulatory requirements related to third party administrators or that regulatory developments, impose additional burdens, costs or business restrictions that make our business less profitable; for example, regulations relating to security, cybersecurity, AI and data privacy as we manage a large amount of highly sensitive and confidential information including personally identifiable information, protected health information and financial information; • Volatility in our case volumes, which are dependent upon a number of factors and difficult to forecast accurately, could impact our revenues; • Wage inflation, difficulty attracting and retaining talent, and rising technology costs, may impact our ability to remain competitive in the marketplace and profitably fulfill our existing contracts (other than those that provide cost-plus or other margin protection); • We may be unable to develop further efficiencies in our claims-handling business and may be unable to obtain or retain certain clients if we fail to make adequate improvements in technology or operations; and • Underwriting enterprises or certain large self-insured entities may create in-house servicing capabilities, including as a result of the adoption of AI that compete with our third party administration and other administration, servicing and risk management products, and we could face additional competition from potential new entrants into the global claims management services market. See also "We are subject to risks associated with AI." If any of these risks materialize, our results of operations and financial condition could be adversely affected. Regulatory, Legal and Accounting Risks Improper disclosure of confidential, personal or proprietary information and cybersecurity attacks or other security breach of our information systems, or those of third-party vendors we rely on, could result in regulatory scrutiny, legal liability or reputational harm, and could adversely affect our business, financial condition and reputation. We collect, use, store, transmit and otherwise process, confidential, personal and proprietary information relating to our company, acquisition targets, our employees and our clients. This information includes personally identifiable information, protected health information, financial information, mergers and acquisitions information and intellectual property. We maintain policies, procedures and technical safeguards designed to protect the security and privacy of confidential, personal and proprietary information. Nonetheless, we cannot eliminate the risk of human error, malfeasance or highly sophisticated cyber-attacks, which are heightened as a result of military actions and war, including between Russia and Ukraine, the Middle East, Latin America and the Caribbean, or other cybersecurity incidents. Further, there is a possibility that our internal processes and those of our third-party vendors to de-identify or delete confidential, personal and proprietary information may not be adequate to ensure that sensitive information is disposed of in compliance with applicable laws and regulations. In addition, our increased reliance on technologies that support remote and hybrid work and our employees' more frequent use of personal devices and non-standard business processing as well as the increasing prevalence of sophisticated cyber-attacks using AI, such as "deep fakes," may increase the risk of cybersecurity or data breaches from circumvention of security systems, denial-of-service attacks or other cyber-attacks, hacking, "phishing" 22

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attacks (including digital or telephonic impersonation), computer viruses, ransomware, malware, malicious or destructive code, employee or insider error, malfeasance, social engineering, physical breaches or other actions. It is possible that our preventive, detective, containment or remedial security controls, employee training and other aspects of our cybersecurity safeguards are not effective. We have and continue to invest in technology security initiatives, policies, resources and employee training. The cost and operational consequences of implementing, maintaining and enhancing appropriate technical measures is high. Given the continuously evolving cyber threat landscape, it will become increasingly difficult to detect, defend against and remediate cybersecurity incidents and data breaches. If we are unable to effectively maintain and enhance our system safeguards in line with evolving cyber threats, including in connection with the integration of acquisitions, we may incur unexpected costs, including litigation costs, regulatory enforcement action, loss of clients, reputational damage, and certain of our systems may become more vulnerable to unauthorized access. We rely on IT and third party vendors some of which have direct access to our systems, to support our business activities, including our secure processing of personal, confidential, sensitive, proprietary and other types of information. Despite ongoing efforts to improve our and our vendors' ability to protect and defend against cyber-attacks, we may not be able to protect all of our data. From time to time, cybersecurity incidents and data breaches of certain systems on which we rely have occurred, such as computer viruses, unauthorized parties gaining access to our information technology systems, and privacy incidents, such as loss or inadvertent transmission of data, although to date we have not been materially impacted by such events. In the future, breaches of any third-party or internal systems may result from circumvention of security systems, denial-of-service, hacking, "phishing", computer viruses, ransomware, malware, or other cyber-attacks, employee or insider error, malfeasance, social engineering, physical breaches or other actions. Furthermore, the risk from threat actors has increased due to the rapid development of AI capabilities. With respect to our commercial arrangements with third-party vendors, we have processes designed to require third party IT outsourcing, offsite storage and other vendors to agree to maintain certain standards with respect to their storage, protection and transfer of confidential, personal and proprietary information. However, we have limited control over their security, privacy and data governance practices so there can be no assurance that we can prevent, mitigate, or remediate a potential failure of those standards and we remain at risk of a cyber or data incident due to the intentional or unintentional non-compliance by a vendor's employee or agent, the breakdown of a vendor's processes, or a cybersecurity incident involving vendor's information systems. We cannot ensure that any provisions in our agreements with these vendors would be enforceable or adequate or would otherwise protect us from any liability in connection with these incidents. See also "Our business or reputation could be harmed by our reliance on third-party providers." We are an acquisitive organization. The process of integrating information systems of businesses we acquire is complex and exposes us to additional risk as we might not adequately identify weaknesses in the targets' information systems or information handling, privacy and security policies and protocols, which could expose us to unexpected liabilities or make our own systems and data more vulnerable to employee or insider error, malfeasance or cybersecurity incidents. These risks may be exacerbated in connection with the integration of AssuredPartners. Any future, material cybersecurity or data incident, may cause us to experience unauthorized access, exfiltration, manipulation, corruption, loss or disclosure of our proprietary, client, employee, or other data, reputational harm, the inability to render services due to system outages or other business disruptions, loss of clients and revenue, regulatory action and scrutiny, sanctions or other statutory penalties, litigation, liability for failure to safeguard clients' information, increases in cybersecurity costs or financial losses. Any of the foregoing may be exacerbated by a delay or failure to detect a cybersecurity incident or the full extent of such incident. In addition, disclosure or media reports of actual or perceived security vulnerabilities to our systems or those of our third- party service providers, even if no breach has been attempted or occurred, could lead to reputational harm, loss of customers and revenue, or increased regulatory actions oversight and scrutiny. Such incidents could result in confidential, personal or proprietary information being lost or stolen, used to perpetuate fraud, maliciously made public, surreptitiously modified, or rendered inaccessible for a period of time. We cannot ensure that any limitations of liability provisions in our agreements with clients, vendors and other third parties with which we do business would be enforceable or adequate or would otherwise protect us from any liability with respect to claims arising from a cybersecurity, data or similar incident. During a cybersecurity incident, we might have to take our systems offline, which could interfere with services to our clients or damage our reputation. While we endeavor to design and implement technologies, controls, policies and procedures to identify such incidents as quickly as possible, any response could take substantial time, and there may be extensive delays before we obtain full and reliable information. During such time we would not necessarily know the extent of the harm or how best to remediate it, and certain errors or actions could be repeated or compounded before they are discovered and remediated, all of which may further increase the costs and consequences of such incident. Any of these losses may not be insured against or be fully covered by insurance we maintain. Further, we cannot ensure that our and our third-party vendors' existing insurance coverage will continue to be available on acceptable terms or at all. Certain 23

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regulations and contractual obligations require us to inform regulators, clients or affected persons in the event of a breach of confidential, personal or proprietary information on our or our third-party vendors' systems, which we may need to deliver before we fully understand the impact of such breach resulting in damage to our reputation and our relationship with regulators and clients. In addition, the competition for talent is high in the cybersecurity and privacy space, and we may not be able to hire, develop or retain suitable talent that we need to be capable of minimizing, identifying, mitigating or remediating these risks. With respect to our commercial arrangements with third-party vendors, we have processes designed to require third party IT outsourcing, offsite storage and other vendors to agree to maintain certain standards with respect to their storage, protection and transfer of confidential, personal and proprietary information. However, we have limited control over their security, privacy and data governance practices so there can be no assurance that we can prevent, mitigate, or remediate a potential failure of those standards and we remain at risk of a cyber or data incident due to the intentional or unintentional non-compliance by a vendor's employee or agent, the breakdown of a vendor's processes, or a cybersecurity incident involving vendor's information systems. We cannot ensure that any provisions in our agreements with these vendors would be enforceable or adequate or would otherwise protect us from any liability in connection with these incidents. See also "Our business or reputation could be harmed by our reliance on third-party providers." Any of the foregoing may have a material adverse effect on our business, financial condition and reputation. Changes in data privacy and protection laws and regulations, or any failure to comply with such laws and regulations, could adversely affect our business and financial results. We are subject to a variety of continuously evolving and developing laws and regulations globally regarding privacy, data protection, and data security, including those related to the collection, storage, handling, use, disclosure, cross-border transfer, destruction, and security of personal data. These laws apply to transfers of personal information among our affiliates, as well as to transactions we enter into with third party vendors and clients. Significant uncertainty exists as privacy and data protection laws evolve. Such laws are complex and may be interpreted and applied differently from country to country and state to state, and may create inconsistent or conflicting requirements. Some of these laws provide rights to individuals to access, correct, and delete their personal information and to obtain copies at the expense of the business entities that process their data. Some of these laws carry heavy penalties for violations, e.g., fines of up to 4% of worldwide revenue under the U.K. Data Protection Act and the European Union General Data Protection Regulation (which we refer to as GDPR), up to $20,000 per violation under the Colorado Privacy Act (which we refer to as CPA), and up to $7,500 per intentional violation under the California Consumer Privacy Act (which we refer to as CCPA). In the U.S., there is pending federal legislation and over a dozen states have proposed and some have implemented their own comprehensive data privacy bills similar to the GDPR and CCPA, with some of those laws already in effect, and others coming into effect through 2026. Despite recent privacy frameworks developed between the U.S., the U.K. and the E.U., there remains a high level of uncertainty concerning the flow of personal information between these jurisdictions, which may impair our ability to offer existing and new services and increase our costs and compliance burden. India and other countries where we have operations outside the U.S. have proposed or have enacted sweeping data protection laws, and in some cases we are subject to sector and personal data localization laws that may require that data or personal data stay within their borders, such as India's IRDIA (Maintenance of Insurance Records) Regulation, 2015. In addition, in the U.S., legislators are continuing to enact comprehensive cybersecurity laws. For example, we are subject to the New York State Department of Financial Services Cybersecurity Regulation for Financial Services Companies, which were substantively amended in 2023. We also expect to be subject to a variety of laws and regulations governing AI, such as the E.U. AI Act which was enacted in 2024 and will gradually enter into force during the next two years, the Colorado AI Act, and the California AI Transparency Act. Further, the issuance of the President's AI Executive Order entitled "Ensuring a National Policy Framework for Artificial Intelligence" introduces significant uncertainty in the regulatory landscape for AI across the United States. This uncertainty may lead to a fragmented regulatory environment, complicating compliance efforts, increasing operational risks, and potentially impacting the company's ability to adapt to evolving legal and regulatory requirements. These laws and regulations are still evolving, and while we are continuing to assess how regulators may apply existing consumer protection, data protection and other similar laws to AI, there is uncertainty regarding the scope of new laws and how existing laws will apply. Due to this uncertainty, we may face challenges complying with existing and new laws, and our policies and governance frameworks may not be successful in mitigating these risks. See also "We are subject to risks associated with AI." Adhering to the increased obligations imposed by various new and emerging laws as well as the terms of our privacy notices and contractual obligations to third parties causes us to incur substantial expense in connection with developing, implementing, and securing our systems and effectively implementing data privacy governance policies for the lawful processing of personal data. Such increased obligations also result in the allocation of additional resources towards new privacy compliance processes and enhanced technologies, further contributing to our IT and compliance costs. We have implemented privacy policies detailing how we collect, use, disclose, transfer across borders, retain, and otherwise process personal information but our employees, third-party vendors or other third parties we work with may not fully adhere to 24

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such policies. Such non-compliance could lead to private rights of action or regulatory enforcement actions or investigations if our processing of personal data is deemed deceptive, unfair, misrepresentative of our published privacy notices or otherwise non-compliant with privacy regulation. In addition, enforcement actions and investigations by regulatory authorities related to data security incidents and privacy violations generally continue to increase. The enactment of more restrictive laws, rules, regulations, or future enforcement actions or investigations could impact us through increased costs or restrictions on our business and could result in regulatory penalties and significant legal liability. We are subject to a number of contingencies and legal proceedings which, if determined unfavorably to us, would adversely affect our financial results. We are or have been subject to numerous claims, tax assessments, lawsuits and proceedings that arise in the ordinary course of business. Such claims, lawsuits and other proceedings include claims for damages based on allegations that our employees or sub-agents improperly failed to procure coverage, report claims on behalf of clients, provide underwriting enterprises with complete and accurate information relating to the risks being insured, or provide clients with appropriate consulting, advisory, pension and claims handling services. There is the risk that our employees or sub-agents may fail to appropriately apply funds that we hold for our clients on a fiduciary basis. Certain of our benefits and retirement consultants provide investment advisory or decision-making services to clients. Additionally, Gallagher Re operates a securities business. If our clients experience investment losses, our reputation could be damaged and our financial results could be negatively affected as a result of claims asserted against us and lost business. Where appropriate, we have established provisions against these matters that we believe are adequate in light of current information and legal advice, and we adjust such provisions from time to time based on current material developments. The damages claimed in such matters are or may be substantial, including, in many instances, claims for punitive, treble or other extraordinary damages. It is possible that, if the outcomes of these contingencies and legal proceedings were not favorable to us, it could materially adversely affect our future financial results. In addition, our results of operations, financial condition or liquidity may be adversely affected if, in the future, our insurance coverage proves to be inadequate or unavailable or we experience an increase in liabilities for which we self-insure. We have purchased E&O insurance and other insurance to provide protection against losses that arise in such matters. Accruals for these items, net of insurance receivables, when applicable, have been provided to the extent that losses are deemed probable and are reasonably estimable. These accruals and receivables are adjusted from time to time as current developments warrant. As more fully described in Note 15 to our 2025 consolidated financial statements, we are a defendant in various legal actions incidental to our business, including but not limited to matters related to employment practices, alleged breaches of non-compete or other restrictive covenants, theft of trade secrets, breaches of fiduciary duties, and related causes of action. We are also periodically the subject of inquiries and investigations by regulatory and tax authorities into various matters related to our business. For example, our micro-captive advisory services business has been under investigation by the IRS since 2013. We currently believe that the ultimate outcome of these proceedings, individually and in the aggregate, will not materially harm our financial position, results of operations or cash flows. However, legal proceedings and government investigations are subject to inherent uncertainties, and unfavorable rulings or other adverse events could occur, including the payment of substantial monetary damages or an injunction or other order prohibiting us from selling one or more products at all or in particular ways, precluding particular business practices or requiring other remedies, which may result in a material adverse impact on our business, results of operations or financial position. In addition, regardless of any unfavorable ruling, any such matter could expose us to negative publicity, reputational damage, harm to our client or employee relationships, or diversion of personnel and management resources, which could adversely affect our ability to recruit quality brokers and other significant employees to our business, and otherwise adversely affect our results of operations. We could be adversely affected by violations or alleged violations of laws that impose requirements for the conduct of our overseas operations, including the FCPA, the U.K. Bribery Act or other anti-corruption laws, sanctions laws and FATCA. In countries outside the U.S., a risk exists that our employees or third parties acting on our behalf, including correspondent brokers, consultants, introducers, partners or agents, could engage in business practices prohibited by applicable laws and regulations, including anti-bribery and anti-corruption laws, and sanctions laws such as those administered by the U.S. Department of the Treasury's Office of Foreign Assets Control. Anti-bribery and anti-corruption laws, such as the FCPA and the U.K. Bribery Act, generally prohibit companies from making improper payments to foreign officials and require companies to keep accurate books and records and maintain appropriate internal controls. Trade and financial sanctions laws generally restrict the ability to engage in trade with, or provide goods or services, to designated governments or other parties, or may require freezing of such parties' assets. We operate in some parts of the world that have experienced governmental corruption. In such parts of the world, in certain circumstances, local customs and practice might not be consistent with the requirements of anti-bribery and anti-corruption laws. Similarly, some of these countries do not 25

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implement sanctions laws and may not restrict trade with parties designated as sanctions targets under U.S., U.K. or E.U. laws. Our policies mandate strict compliance with such laws and we devote substantial resources to programs designed to ensure compliance, including investigating business practices and taking steps to address the risk that our employees, third party representatives, partners or agents will engage in business practices that are prohibited by our policies and/or such laws and regulations. We offer client service capabilities in many countries around the world and sometimes work through a network of third- party representatives acting on our behalf such as correspondent brokers and consultants. There is a risk that our third party representatives engage in business practices that are prohibited by our internal policies or violate applicable laws and regulations, such as the FCPA and the U.K. Anti-Bribery Act. Violations by us or our third party representatives could result in significant internal investigation costs and legal fees, civil and criminal penalties, including prohibitions on the conduct of our business, and reputational harm. We may also be subject to legal liability and reputational damage if we violate trade sanctions laws of the U.S., the E.U., the U.K. and other jurisdictions in which we operate. In addition, FATCA requires certain of our subsidiaries, affiliates and other entities to obtain valid FATCA documentation from payees prior to remitting certain payments to such payees and our failure to do so properly could result in penalties. We are subject to regulation worldwide. If we fail to comply with regulatory requirements or if regulations change in a way that adversely affects our operations, we may not be able to conduct our business, or we may be less profitable. Many of our activities throughout the world, especially regulated businesses such as our insurance brokerage, securities broker-dealer and investment advisory services, are subject to supervision and regulations promulgated by regulatory or self-regulatory bodies such as the SEC, the NYSE, the DOJ, the IRS, the Financial Crimes Enforcement Network, the FTC and FINRA in the U.S., the FCA in the U.K., the Australian Securities and Investments Commission in Australia and insurance regulators in nearly every jurisdiction in which we operate. Our retirement-related consulting and investment advisory services are subject to pension law and financial regulation in many countries. Our activities are also subject to a variety of other laws, rules and regulations addressing licensing, cybersecurity, data privacy, AI, wage-and-hour standards, employment and labor relations, competition, anti-corruption, currency, the conduct of business, reserves and the amount of local investment with respect to our operations in certain countries. For example, the DOJ updated its guidance on corporate compliance programs to include AI risk management. These and other forms of regulatory action could reduce our profitability or growth by increasing the costs of compliance, increasing the risk of costly enforcement actions, restricting the products or services we sell, the markets we enter, the methods by which we sell our products and services, or the prices we can charge for our services and the form of compensation we can accept from our clients, underwriting enterprises and third parties. As our operations grow around the world, it is increasingly difficult to monitor and enforce regulatory compliance across the organization. A compliance failure by even one of our smallest branches could lead to a loss of reputation in the local market, and litigation and/or disciplinary actions that may include compensating clients for loss, the imposition of penalties, and/or the loss of our authorization to operate. In all such cases, we would also likely incur significant internal investigation costs and legal fees. The global nature of our operations increases the complexity and cost of compliance with laws and regulations, including increased staffing needs, the development of new policies, procedures and internal controls and providing training to employees in multiple locations, adding to our cost of doing business. Many of these laws and regulations may have differing or conflicting legal standards across jurisdictions, increasing further the complexity and cost of compliance. We experience substantial geopolitical and regulatory changes on a real-time basis, which may lead to uncertainty and increase the complexity, difficulty, and cost of compliance. In emerging markets and other jurisdictions with less developed legal systems, local laws and regulations may not be established with sufficiently clear and reliable guidance to provide us with adequate assurance that we are aware of all necessary licenses to operate our business, that we are operating our business in a compliant manner, or that our rights are otherwise protected. In addition, major political and legal developments in jurisdictions in which we do business may lead to new regulatory costs and challenges. For example, China has in place a "blocking" statute similar to that of the E.U. requiring compliance with certain Chinese laws if they conflict with U.S. laws. Rising global tensions and protectionism may also lead other countries to adopt similar blocking statutes, which could make it more difficult and costly for us to expand our operations globally. Changes in legislation or regulations and actions by regulators, including changes in administration and enforcement policies, or the failure of state and local governments to follow through on agreed-upon state and local tax credits or other tax related incentives, could adversely affect our results of operations or require operational changes that could result in lost revenues or higher costs or hinder our ability to operate our business. 26

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For example, the method by which insurance brokers are compensated has received substantial scrutiny in the past because of the potential for conflicts of interest. The potential for conflicts of interest arises when a broker is compensated by two parties in connection with the same or similar transactions. The vast majority of the compensation we receive for our work as insurance and reinsurance brokers is in the form of retail commissions and fees. We receive additional revenue from underwriting enterprises, separate from retail commissions and fees, including, among other things, contingent and supplemental revenues and payments for consulting and analytics services we provide them. Future changes in the regulatory environment may impact our ability to collect these revenues. Adverse regulatory, legal or other developments regarding these revenues could have a material adverse effect on our business, results of operations or financial condition, expose us to negative publicity and reputational damage and harm our relationships with clients, underwriting enterprises or other business partners. In addition, climate change and sustainability issues remain a significant focus for investors, clients and other business partners, while regulatory approaches across jurisdictions continue to vary widely. Some jurisdictions, such as the U.K., Australia and the State of California, are intensifying regulation and enforcement with respect to climate-related disclosures, where others are moving towards deregulation – for example, at the U.S. federal level the SEC abandoned the defense of the climate-related disclosures rule and the E.U. approved the Omnibus I directive that reduced significantly the entities subject to, and the requirements of, the Corporate Sustainability Reporting Directive (which we refer to as CSRD) and the Corporate Sustainability Due Diligence Directive (which we refer to as CSDDD). In addition, the State of Texas recently issued an opinion on the legality of corporate DEI programs taking the position that such programs are potentially unlawful under certain circumstances. Navigating these inconsistent and evolving rules may demand substantial effort and resources, potentially diverting management's attention. Failure to effectively navigate these complexities could harm our reputation and strain relationships with regulators, investors, clients, and other business partners, which may adversely affect our business, operating results and financial condition. Changes in our accounting estimates and assumptions could negatively affect our financial position and operating results. We prepare our financial statements in accordance with U.S. generally accepted accounting principles (which we refer to as GAAP). These accounting principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of our consolidated financial statements. We are also required to make certain judgments and estimates that affect the disclosed and recorded amounts of revenues and expenses related to revenue recognition and deferred costs - see Note 4 to our 2025 consolidated financial statements. We periodically evaluate our estimates and assumptions, including those relating to the valuation of goodwill and other intangible assets, investments, income taxes, revenue recognition, deferred costs, stock-based compensation, claims handling obligations, retirement plans, litigation and contingencies. We base our estimates on historical experience and various assumptions that we believe to be reasonable based on specific circumstances. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed in our consolidated financial statements. Further, in 2022, the U.S. enacted the Inflation Reduction Act (which we refer to as the IRA) which, among other things, implements a corporate book minimum tax and an excise tax on stock buy backs. While guidance is still being issued and the administration may enact significant amendments to the IRA, our current understanding of the IRA suggests that we will not face significant impacts. Additionally, in July 2025, the U.S. enacted the One Big Beautiful Bill Act which includes significant provisions, such as the permanent extension of certain expiring provisions of the Tax Cuts and Jobs Act, modifications to the international tax framework and the restoration of favorable tax treatment for certain business provisions. The legislation has multiple effective dates, with certain provisions effective in 2025 and others implemented through 2027. The application of the OBBBA did not have any material impact on our financial statements for 2025. As additional guidance relating to the IRA, OBBBA, and upcoming amendments are released, our estimates related to tax and other liabilities arising under these frameworks may change. Additionally, changes in accounting standards (see Note 2 to our 2025 consolidated financial statements) could increase costs to the organization and could have an adverse impact on our future financial position and results of operations. Limited protection of our intellectual property could harm our business and our ability to compete effectively, and we face the risk that our services or products may infringe upon the intellectual property rights of others. We cannot guarantee that trade secret, trademark and copyright law protections, or our internal policies and procedures regarding our management of intellectual property, are adequate to deter misappropriation of our intellectual property. Existing laws of some countries in which we provide services or products may offer only limited protection of our intellectual property rights. Also, we may be unable to detect the unauthorized use of our intellectual property and take the necessary steps to enforce our rights, which may have a material adverse impact on our business, financial condition or results of operations. We cannot be sure that our services and products, or the products of others that we offer to our clients, do not infringe on the intellectual property rights of third parties, and we may have infringement claims asserted 27

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against us or our clients. These claims may harm our reputation, result in financial liability, consume financial resources to pursue or defend, and prevent us from offering some services or products. In addition, these claims, whether with or without merit, could be expensive, take significant time and divert management's focus and resources from business operations. Successful challenges against us could require us to modify or discontinue our use of technology or business processes where such use is found to infringe or violate the rights of others, or require us to purchase licenses from third parties, any of which could adversely affect our business, financial condition and operating results. Risks Relating to our Investments, Debt and Common Stock Our clean energy investments are subject to various risks and uncertainties. We generated tax credits under IRC Section 45 from 2009 to 2021. As of December 31, 2025, we had generated a total of $1,706 million in IRC Section 45 tax credits, of which approximately $1,102 million have been used to offset U.S. federal tax liabilities and $604 million remain unused and available to offset future U.S. federal tax liabilities. Our ability to use tax credits under IRC Section 45 depends upon the operations in which we invested having satisfied the conditions set forth in IRC Section 45. These include, among others, the "placed-in-service" condition and requirements relating to qualified emissions reductions, coal sales to unrelated parties and at least one of the operations' owners qualifying as a "producer" of refined coal. While we have received some degree of confirmation from the IRS relating to our ability to claim these tax credits, the IRS could ultimately determine that the operations did not satisfy the conditions set forth in IRC Section 45. The IRS audited a number of these operations. Such audits were either closed with no adjustments or, in one instance, the relevant partnership defended its position in court and prevailed. There is a risk that foreign laws will not protect the intellectual property associated with The Chem-Mod™ Solution to the same extent as U.S. laws, leaving us vulnerable to companies outside the U.S. who may attempt to copy such intellectual property. In addition, other companies may make claims of intellectual property infringement with respect to The Chem- Mod™ Solution. Litigation is inherently uncertain and it is not possible for us to predict the ultimate outcome of any future claims against us by other parties. The IRC Section 45 operations in which we have invested and the by-products from such operations may result in environmental and product liability claims and environmental compliance costs. The construction and operation of the IRC Section 45 operations were subject to federal, state and local laws, regulations and potential liabilities arising under or relating to the protection or preservation of the environment, natural resources and human health and safety. Some environmental laws, without regard to fault or the legality of a party's conduct, impose liability on certain entities that are considered to have contributed to, or are otherwise responsible for, the release or threatened release of hazardous substances into the environment. One party may, under certain circumstances, be required to bear more than its share or the entire share of investigation and cleanup costs at a site if payments or participation cannot be obtained from other responsible parties. By having used The Chem-Mod™ Solution at locations owned and operated by others, we and our partners may be exposed to the risk of being held liable for environmental damage from releases of hazardous substances we may have had little, if any, involvement in creating. Such risk remains even after production ceases at an operation to the extent the environmental damage can be traced to the types of chemicals or compounds used or operations conducted in connection with The Chem-Mod™ Solution. Increasing attention to global climate change has resulted in an increased possibility of regulatory attention and private litigation. For example, claims have been made against certain energy companies alleging that greenhouse gas emissions constitute a public nuisance. In addition to the possibility of being named in such actions, we and our partners could face the risk of environmental and product liability claims related to concrete incorporating fly ash produced using The Chem-Mod™ Solution. No assurances can be given that contractual arrangements and precautions taken to provide for assumption of these risks by facility owners or operators, or other end users, will result in that facility owner or operator, or other end user, accepting full responsibility for any environmental or product liability claim. Nor can we or our partners be certain that facility owners or operators, or other end users, fully complied with all applicable laws and regulations, and this could result in environmental or product liability claims. It is also common for private claims by third parties alleging contamination to also include claims for personal injury, property damage, nuisance, diminution of property value, or similar claims. Furthermore, many environmental, health and safety laws authorize citizen suits, permitting third parties to make claims for violations of laws or permits. Our insurance may not cover all environmental risk and costs or may not provide sufficient coverage in the event of an environmental or product liability claim, and defense of such claims can be costly, even when such defense prevails. If significant uninsured losses arise from environmental or product liability claims, or if the costs of environmental compliance increase for any reason, our results of operations and financial condition could be adversely affected. 28

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We have debt outstanding that could adversely affect our financial flexibility and subjects us to restrictions and limitations that could significantly impact our ability to operate our business. As of December 31, 2025, we had total consolidated debt outstanding of approximately $13.1 billion. The level of debt outstanding each period could adversely affect our financial flexibility. We also bear risk at the time our debt matures. Our ability to make interest and principal payments, to refinance our debt obligations and to fund our acquisition program and planned capital expenditures will depend on our ability to generate cash from operations. This, to a certain extent, is subject to general economic, financial, competitive, legislative, regulatory and other factors that are beyond our control, such as an environment of rising interest rates. A small portion of our private placement debt consists of floating rate notes, and interest payments under our senior revolving credit facility are based on a floating rate which exposes us to the risk of a changing or unknown rate environment. Our indebtedness will also reduce the ability to use that cash for other purposes, including working capital, dividends to stockholders, acquisitions, capital expenditures, share repurchases, and general corporate purposes. If we cannot service our indebtedness, we may have to take actions such as selling assets, issuing additional equity or reducing or delaying capital expenditures, strategic acquisitions, and investments, any of which could impede the implementation of our business strategy or prevent us from entering into transactions that would otherwise benefit our business. Additionally, we may not be able to effect such actions, if necessary, or refinance any of our indebtedness on commercially reasonable terms, or at all. The agreements governing our debt include covenants that, among other things, restrict our ability to dispose of assets, incur additional debt, engage in certain asset sales, mergers, acquisitions or similar transactions, create liens on assets, engage in certain transactions with affiliates, change our business or make investments, and require us to comply with certain financial and legal covenants. The restrictions in the agreements governing our debt may prevent us from taking actions that we believe would be in the best interest of our business and our stockholders and may make it difficult for us to execute our business strategy successfully or effectively compete with companies that are not similarly restricted. We may also incur future debt obligations that might subject us to additional or more restrictive covenants that could affect our financial and operational flexibility, including our ability to pay dividends. We cannot make any assurances that we will be able to refinance our debt or obtain additional financing on terms acceptable to us, or at all. A failure to comply with the restrictions under the agreements governing our debt could result in a default under the financing obligations or could require us to obtain waivers from our lenders for failure to comply with these restrictions. The occurrence of a default that remains uncured or the inability to secure a necessary consent or waiver could cause our obligations with respect to our debt to be accelerated and have a material adverse effect on our financial condition and results of operations. Our reinsurance securities business serves from time to time as the underwriter and initial purchaser of securities (such as catastrophe bonds) issued by our reinsurance company clients. This involves us, acting as an intermediary, using our capital on hand and short-term borrowings to cover the purchase price of the securities. We place the securities with investors and use the funds we receive from them to repay our obligations. Risks specific to these short-term borrowings include counterparty risk (which is the risk that arises due to uncertainty about a counterparty's ability to meet its obligations) with respect to the investors. Non-performance by any of our counterparties in these transactions for financial or other reasons could potentially expose us to material losses. Credit rating downgrades would increase our financing costs and could subject us to operational risk. If we need to raise capital in the future (for example, in order to maintain adequate liquidity, fund maturing debt obligations or finance acquisitions or other initiatives), credit rating downgrades would increase our financing costs, and could limit our access to financing sources. We would also face the risk of a credit rating downgrade if we do not retire or refinance the debt to levels acceptable to the credit rating agencies in a timely manner. Further, a downgrade to a rating below investment-grade could result in greater operational risks through increased operating costs and increased competitive pressures. We are a holding company and, therefore, may not be able to receive dividends or other distributions in needed amounts from our subsidiaries. We are organized as a holding company, a legal entity separate and distinct from our operating subsidiaries. As a holding company without significant operations of our own, we are dependent upon dividends and other payments from our operating subsidiaries to meet our obligations for paying principal and interest on outstanding debt obligations, for paying dividends to stockholders, repurchasing our common stock and for corporate expenses. In the event our operating subsidiaries are unable to pay sufficient dividends and other payments to us, we may not be able to service our debt, pay our obligations, pay dividends on or repurchase our common stock. Further, we derive a meaningful portion of our revenue and operating profit from operating subsidiaries located outside the U.S. Since the majority of financing obligations as well as dividends to stockholders are paid from the U.S., it is important to be able to access the cash generated by our operating subsidiaries located outside the U.S. in the event we are unable to meet these U.S. based cash requirements. 29

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Funds from our operating subsidiaries outside the U.S. may be repatriated to the U.S. via stockholder distributions and intercompany financings, where necessary. A number of factors may arise that could limit our ability to repatriate funds or make repatriation cost prohibitive, including, but not limited to the imposition of currency controls and other government restrictions on repatriation in the jurisdictions in which our subsidiaries operate, fluctuations in foreign exchange rates, the imposition of withholding and other taxes on such payments and our ability to repatriate earnings in a tax-efficient manner. In the event we are unable to generate or repatriate cash from our operating subsidiaries for any of the reasons discussed above, our overall liquidity could deteriorate and our ability to finance our obligations, including to pay dividends on or repurchase our common stock, could be adversely affected. Future sales or other dilution of our equity could adversely affect the market price of our common stock. An important way we grow our business is through acquisitions. One method of acquiring companies or otherwise funding our corporate activities is through the issuance of additional equity securities. The issuance of any additional shares of common or of preferred stock or convertible securities could be substantially dilutive to holders of our common stock. Moreover, to the extent that we issue restricted stock units, performance stock units, options or warrants to purchase shares of our common stock in the future and those options or warrants are exercised or as the restricted stock units or performance stock units vest, our stockholders will experience further dilution. In March 2024, we established an "at the market" equity offering program (which we refer to as an ATM program) pursuant to which we may offer and sell up to 3,000,000 shares of our common stock. We have refreshed our ATM program in the past and expect to refresh our ATM program periodically. Sales under our ATM program will result in additional dilution for our stockholders. Holders of our common stock have no preemptive rights that entitle holders to purchase their pro rata share of any offering of shares of any class or series and, therefore, such sales or offerings could result in increased dilution to our stockholders. The market price of our common stock could decline as a result of sales of shares of our common stock or the perception that such sales could occur. Item 1B. Unresolved Staff Comments. Not applicable. Item 1C. Cybersecurity. We have implemented a cybersecurity program to assess, identify, and manage risks from cybersecurity threats that could adversely and materially affect the confidentiality, integrity, and availability of our information and information systems. We maintain administrative, technical, and physical safeguards designed to protect the security and privacy of confidential, personal and proprietary information. Our cybersecurity program is aligned with notable control frameworks such as the NIST CSF (National Institute of Standards and Technology Cybersecurity Framework) and ISO (International Organization for Standardization) 27001. Our Chief Information Security Officer (which we refer to as our CISO), working together with our Chief Information Officer (which we refer to as our CIO), oversees a team of employees dedicated to cybersecurity. Our cybersecurity team includes Business Information Security Officers (which we refer to as BISOs) in each region to lead the cybersecurity program, and to communicate ongoing updates from the cybersecurity team regarding the prevention, detection, mitigation, and remediation of cybersecurity incidents. Our CISO regularly reports to the CIO and is an active member of our management-level enterprise risk management committee, which has broad oversight of the company's enterprise risks, including cybersecurity risks. In addition, our CIO and CISO both attend regular meetings of the executive officer team, including our Chief Executive Officer, Chief Financial Officer, General Counsel and other senior executive officers, dedicated to compliance and risk, and report on cybersecurity matters as appropriate. Our Board of Directors has delegated primary responsibility for the oversight of cybersecurity matters to its Risk and Compliance Committee; however, the full board reviews significant cybersecurity matters as appropriate. Our CIO and CISO report on cybersecurity and information security at each quarterly meeting of the Risk and Compliance Committee. Our cybersecurity program leverages people, processes, and technology to identify and respond to cybersecurity threats. We have a global incident response capability supported by our Security Operations Center (which we refer to as SOC) team, a managed security service provider (MSSP), ReliaQuest, and our global Cybersecurity Incident Response Team (which we refer to as CSIRT), which provides threat detection and incident response. ReliaQuest supports the operation of Gallagher's SOC, and performs triage and escalation of event data from the security information and event management (which we refer to as SIEM) solution. This support enables 24x7 monitoring and allows Gallagher to address threats and/or detections with urgency. We have rolled out additional security technologies for new acquisitions and extended our SOC to monitor acquisitions prior to integration. We have bolstered our internal cyber forensics capability to augment our Security 30

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Operations capability to strengthen our ability to detect incidents, as well as to accelerate our response in parallel with our external partners. We maintain a global cybersecurity incident response plan and related playbooks, for execution by the SOC team and CSIRT, in coordination with internal and external stakeholders, as applicable. Significant incidents are escalated to a cross- departmental team to assess materiality based on qualitative and quantitative factors. This team consists of executives representing core business functions, including, among others, information technology, legal, finance, accounting, data protection and business divisions, in consultation with third-party advisors, as applicable. We undertake periodic leadership tabletop exercises and periodic adversarial ("red team") exercises simulating incident response under common risk scenarios. As an acquisitive organization, we have also established a program to increase our visibility into the cybersecurity environment of acquisition targets prior to closing. Other technology partners provide additional solutions and services, including endpoint detection and response, data loss prevention, dark web monitoring, vulnerability management, next-generation firewalls, advanced web proxy, and other solutions. We have also partnered with a strategic vendor to enable acceleration of our efforts to build the cyber team and mitigate risk across the company. The relationship has brought both talent and flexibility to the team and has enabled acceleration of build-outs and integrations. Identity management is a core component of our cyber program and solutions from Ping and Microsoft are in-place. We have also deployed a global Privileged Access Management solution, which resulted in the vaulting of all elevated user accounts that are subject to a more stringent set of controls tied to account use and duration. Additionally, we have implemented a cloud-based password reset tool offering users a highly secure and easy-to-use interface to reset passwords, regardless of device location, or browser. Email security is a top priority for Gallagher, and we have implemented email threat detection and response services as well as capabilities to protect against phishing attacks and malicious links. Concurrently, we have rolled out phishing simulations targeted at increasing user awareness of common indicators of malicious messages. We have additionally implemented and are expanding coverage of advanced messaging features to prevent email compromise and data exfiltration, including deepfake detection and prevention. We have established a dedicated vendor assessment team, which employs systems and processes designed to oversee, identify, and reduce the potential impact of a security incident at a third-party vendor, service provider or customer or that otherwise implicates the third-party technology and systems we use. We also require cybersecurity insurance coverage for vendors whose services or products may present a cybersecurity risk. We continuously test and assess our cybersecurity posture, including through annual third-party risk assessments performed by reputable assessors, consultants and auditors. A global FAIR (Factor Analysis of Information Risk) assessment is conducted at least annually to update our cybersecurity risks and corresponding mitigations strategies. This process results in a quantitative understanding of our top cyber risks based on annualized loss expectancy. Our top risks, in turn, guide our prioritization of cybersecurity program maturation efforts to focus on initiatives offering Gallagher the greatest residual risk reduction. Penetration testing is performed globally at least quarterly by our professional partners in cooperation with internal Gallagher teams. We also support leadership tabletop exercises and periodic adversarial ("red team") exercises simulating incident response under common risk scenarios. These scenarios are updated regularly to resemble threat actor behavior trends revealed by our threat intelligence sources. Our employees complete training on data security and our policies when they join us and annually thereafter. We review the content of our mandatory training annually and provide access to a comprehensive set of supplemental training to meet individual and role-specific needs. As a global organization, Gallagher's operational approach to data security and sensitive data such as PHI and PII ties to least privilege – limiting access to data, systems and applications that only align to a user's role and responsibility. Identity management solutions and processes, such as regular user access reviews, govern the principle of least privilege. Policies inclusive of data classification and regulatory requirements for sensitive data handling mandate secure device and data handling practices, as well as controls such as an encryption and data loss prevention. Of note, Data Loss Prevention tooling has been implemented globally to monitor, prevent and detect data leakage. Our CIO has more than 30 years of experience, including from his prior business and technology leadership roles at Aegon N.V., Citigroup, Inc. and JP Morgan Chase & Company. Our CISO has more than 20 years of cybersecurity experience. Prior to joining us, he was Senior Vice President, Chief Information Security Officer at Brighthouse Financial. Before then, he served as Technology Vice President & Chief Information Security Officer for GE Healthcare. He started his career at Allstate Insurance Company. He also holds security, privacy and risk certifications, including Certified Information Systems Auditor, Certified Information Security Manager and Certified Information Systems Security Professional. 31

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Gallagher remains committed to maintaining and improving our existing security posture. We regularly monitor and assess the policies and procedures in place and continue to work with leading global cybersecurity investigation firms with expertise in data privacy incident response and containment. We, including our third-party vendors, have experienced cybersecurity incidents and threats and may continue to experience them in the future. Based on the information available as of the date of this Annual Report on Form 10-K, we believe that during the last three fiscal years risks from cybersecurity threats, including as a result of previous cybersecurity incidents, have not materially affected us, including our business strategy, results of operations or financial condition, and as of the date of this Annual Report on Form 10-K, the Company is not aware of any material risks from cybersecurity threats that are reasonably likely to do so. However, we cannot eliminate all risks from cybersecurity threats or provide assurances that the Company will not be materially affected by such risks in the future. Due to evolving cybersecurity threats, we may not be able to protect all information systems and, as an acquisitive organization, integrating information systems as we acquire new businesses may expose us to unexpected liabilities or increase our vulnerability. There can be no guarantee that our policies, programs and controls, and those of our third-party vendors, including those described in this section, will be sufficient to protect our information, information systems or other property. Additional information on cybersecurity risks we face is discussed in Item 1A of Part I, "Risk Factors," which should be read in conjunction with the foregoing information. Item 2. Properties. The executive offices of our corporate segment and certain subsidiary and branch facilities of our brokerage and risk management segments are located at 2850 Golf Road, Rolling Meadows, Illinois, where we own approximately 360,000 square feet of space, and can accommodate 2,000 employees at peak capacity. Elsewhere, we generally operate in leased premises related to the facilities of our brokerage and risk management operations. We prefer to lease office space rather than own real estate related to the branch facilities of our brokerage and risk management segments. Certain of our office space leases have options permitting renewals for additional periods. In addition to minimum fixed rentals, a number of our leases contain annual escalation clauses generally related to increases in an inflation index. See Notes 13 and 15 to our 2025 consolidated financial statements for information with respect to our lease commitments as of December 31, 2025. Item 3. Legal Proceedings. Please see the information set forth in Note 15 to our consolidated financial statements, included herein, under "Litigation, Regulatory and Taxation Matters." Item 4. Mine Safety Disclosures. Not applicable. 32

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Information About Our Executive Officers Set forth below are the names, ages, positions and business backgrounds of our executive officers as of the date hereof: Name Age Position and Year First Elected J. Patrick Gallagher, Jr. 73 Chairman since 2006, Chief Executive Officer since 1995, President 1990 - 2024 Thomas J. Gallagher 67 President since 2024, President of our Global Property/Casualty Brokerage Operations 2017 - 2024, Chairman of our International Brokerage Operation 2010 - 2016 Patrick M. Gallagher 46 Executive Vice President, Chief Operating Officer since 2024, Corporate Vice President and President of Property/Casualty Brokerage Operation in the Americas 2021 - 2024, Chairman, Canada and Caribbean and CEO of Latin America 2019 - 2021, President, Midwest Region of Property/Casualty Brokerage Operation 2016 - 2019 Walter D. Bay 63 Corporate Vice President, General Counsel, Secretary since 2007 Mark H. Bloom 61 Corporate Vice President and Global Chief Information Officer since 2022. Global Chief Information Officer at Aegon N.V., 2016 - 2021 Douglas K. Howell 64 Corporate Vice President, Chief Financial Officer since 2003 Scott R. Hudson 64 Corporate Vice President and President of our Risk Management Operations since 2010 Vishal Jain 64 Corporate Vice President since 2016, Chief Service Officer since 2014 Christopher E. Mead 58 Corporate Vice President, Chief Marketing Officer since 2017 Michael R. Pesch 54 Corporate Vice President, Chief Executive Officer, Global Brokerage – Americas since 2024, Chief Executive Officer – U.S. Retail Brokerage 2016 - 2024 Susan E. Pietrucha 59 Corporate Vice President, Chief Human Resource Officer since 2007 William F. Ziebell 63 President of our Employee Benefit and Consulting Brokerage Operations since 2017, Corporate Vice President since 2011, regional leader in our Employee Benefit and Consulting Brokerage Operations 2004 - 2016 With the exception of Mr. Bloom, we have employed each such person principally in management capacities for more than the past five years. All executive officers are appointed annually and serve at the discretion of our board of directors. 33

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Part II Item 5. Market for the Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities. Our common stock is listed on the New York Stock Exchange, trading under the symbol "AJG." As of January 31, 2026, there were approximately 2,000 holders of record of our common stock. (c) Issuer Purchases of Equity Securities The following table shows the purchases of our common stock made by or on behalf of us or any "affiliated purchaser" (as such term is defined in Rule 10b-18(a)(3) under the Securities Exchange Act of 1934, as amended) of us for each fiscal month in the three-month period ended December 31, 2025: Period Total Number of Shares Purchased (1) Average Price Paid per Share (2) Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (3) Maximum Dollar Value of Shares that May Yet be Purchased Under the Plans or Programs (3) (4) October 1 through October 31, 2025 14,553 $305.99 — $1,500 November 1 through November 30, 2025 6,423 245.04 — 1,500 December 1 through December 31, 2025 7,373 252.71 — 1,500 Total 28,349 $278.32 — (1) Amounts in this column include shares of our common stock purchased by the trustees of trusts established under our Deferred Equity Participation Plan (which we refer to as the DEPP), our Deferred Cash Participation Plan (which we refer to as the DCPP) and our Supplemental Savings and Thrift Plan (which we refer to as the Supplemental Plan), respectively. These plans are considered to be unfunded for purposes of federal tax law since the assets of these trusts are available to our creditors in the event of our financial insolvency. The DEPP is an unfunded, non-qualified deferred compensation plan that generally provides for awards to certain of our key executives that do not vest and/or distribute until participants reach age 62 (or the one-year anniversary of the date of grant for participants over the age of 61). Under sub-plans of the DEPP for certain production staff, the plan generally provides for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65. See Note 10 to our 2025 consolidated financial statements for more information regarding the DEPP. The DCPP is an unfunded, non-qualified deferred compensation plan for certain key employees, other than executive officers, that generally provides for vesting and/or distributions no sooner than five years from the date of awards. Under the terms of the DEPP and the DCPP, we may contribute cash to the trust and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions. For the fourth quarter of 2025, we instructed the trustee for the DEPP and the DCPP to reinvest dividends on shares of our common stock held by these trusts and to purchase our common stock using cash that we contributed to the DCPP related to 2025 awards under the DCPP. The Supplemental Plan is an unfunded, non-qualified deferred compensation plan that allows certain highly compensated employees to defer compensation, including match amounts by the Company, on a before-tax basis or after-tax basis. Under the terms of the Supplemental Plan, all amounts credited to an employee's account may be deemed invested, at the employee's election, in a number of investment options that include various mutual funds, an annuity product and a fund representing our common stock. When an employee elects to have some or all of the amounts credited to the employee's account under the Supplemental Plan deemed to be invested in the fund representing our common stock, the trustee of the trust for the Supplemental Plan purchases shares of our common stock in a number sufficient to ensure that the trust holds a number of shares of our common stock with a value equal to the amounts deemed invested in the fund representing our common stock. This is to ensure that at the time when an employee becomes entitled to a distribution under the terms of the Supplemental Plan, any amounts deemed to be invested in the fund representing our common stock are distributed in the form of shares of our common stock held by the trust. We established the trusts for the DEPP, the DCPP and the Supplemental Plan to assist us in discharging our deferred compensation 34

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obligations under these plans. All assets of these trusts, including any shares of our common stock purchased by the trustees, remain, at all times, assets of the Company, subject to the claims of our creditors in the event of our financial insolvency. The terms of the DEPP, the DCPP and the Supplemental Plan do not provide for a specified limit on the number of shares of common stock that may be purchased by the respective trustees of the trusts. (2) The average price paid per share is calculated on a settlement basis and does not include commissions. (3) Effective July 28, 2021, the board of directors approved a common stock repurchase plan of up to $1.5 billion of common stock. Repurchases of common stock may be effected from time to time through open market purchases, trading plans established in accordance with the U.S. Securities and Exchange Commission's rules, accelerated stock repurchases, private transactions or other means, depending on satisfactory market conditions, applicable legal requirements and other factors. The repurchase plan has no expiration date and we are under no commitment or obligation to repurchase any particular amount of our common stock under the plan. At our discretion, we may suspend the repurchase plan at any time. (4) Dollar values stated in millions. Item 6. [Reserved]. Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations. Introduction The following discussion and analysis should be read in conjunction with our consolidated financial statements and the related notes included in Item 8 of this annual report. In addition, please see "Information Regarding Non-GAAP Measures and Other" beginning on page 38 for a reconciliation of the non-GAAP measures for adjusted total revenues, organic commission, fee and supplemental revenues and adjusted EBITDAC to the comparable GAAP measures, as well as other important information regarding these measures. We are engaged in providing insurance brokerage, reinsurance brokerage, consulting services, and third-party property/ casualty claims settlement and administration services to entities and individuals around the world. We believe that one of our major strengths is our ability to deliver comprehensively structured insurance and risk management services to our clients. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients and we do not assume net underwriting risks. We are headquartered in Rolling Meadows, Illinois, and provide brokerage, risk management and consulting services in approximately 130 countries around the world through our owned operations and a network of correspondent brokers and consultants and third-party property/casualty claims settlement and administration services through a network of offices located throughout Australia, Canada, New Zealand, the U.K. and the U.S. In 2025, we expanded, and expect to continue to expand, our international operations through both acquisitions and organic growth. We generate approximately 67% of our revenues for the combined brokerage and risk management segments domestically, with the remaining 33% generated internationally, primarily in Australia, Canada, New Zealand and the U.K. (based on 2025 revenues). We have three reportable segments: brokerage, risk management and corporate. Brokerage and risk management contributed approximately 87% and 13%, respectively, to 2025 revenues. Our major sources of operating revenues are commissions, fees and supplemental and contingent revenues from brokerage operations and fees from risk management operations. Interest income, premium finance revenues and other income is generated from invested cash and fiduciary funds and revenue from premium financing. Prior Year Discussion of Results and Comparisons For information on fiscal 2024 results and similar comparisons, see "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" of our Form 10-K for the fiscal year ended December 31, 2024. 35

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Summary of Financial Results - Year Ended December 31, See the Reconciliations of Non-GAAP Measures on page 38. Year 2025 Year 2024 Change Reported GAAP Adjusted Non-GAAP Reported GAAP Adjusted Non-GAAP Reported GAAP Adjusted Non-GAAP (In millions, except per share data) Brokerage Segment Revenues $12,192 $12,168 $9,934 $9,941 23 % 22 % Organic revenues $9,786 $9,215 6 % Net earnings $2,052 $1,686 22 % Net earnings margin 16.8 % 17.0 % - 14 bpts Adjusted EBITDAC $4,446 $3,488 27 % Adjusted EBITDAC margin 36.5 % 35.1 % + 145 bpts Diluted net earnings per share $7.85 $12.10 $7.46 $10.85 5 % 12 % Risk Management Segment Revenues before reimbursements $1,585 $1,583 $1,451 $1,450 9 % 9 % Organic revenues $1,489 $1,404 6 % Net earnings $183 $175 5 % Net earnings margin (before reimbursements) 11.6 % 12.1 % - 51 bpts Adjusted EBITDAC $336 $300 12 % Adjusted EBITDAC margin (before reimbursements) 21.2 % 20.7 % + 54 bpts Diluted net earnings per share $0.70 $0.83 $0.78 $0.86 (10) % (3) % Corporate Segment Diluted net loss per share $(2.81) $(2.24) $(1.74) $(1.61) Total Company Diluted net earnings per share $5.74 $10.69 $6.50 $10.10 (12) % 6 % Total Brokerage and Risk Management Segment Diluted net earnings per share $8.55 $12.93 $8.24 $11.71 4 % 10 % In our corporate segment, net after-tax (loss) earnings from our clean energy investments was $(5) million in both 2025 and 2024. At this time, we anticipate our clean energy investments will produce after-tax losses in 2026. 36

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The following provides information that management believes is helpful when comparing revenues before reimbursements, net earnings, EBITDAC and diluted net earnings per share for 2025 and 2024. In addition, these tables provide reconciliations to the most comparable GAAP measures for adjusted revenues, adjusted EBITDAC and adjusted diluted net earnings per share. Reconciliations of EBITDAC for the brokerage and risk management segments are provided on pages 45 and 51 of this filing. Year Ended December 31 Reported GAAP to Adjusted Non-GAAP Reconciliation: (In millions, except per share data) Revenues Before Reimbursements Net Earnings (Loss) EBITDAC Diluted Net Earnings (Loss) Per Share Segment 2025 2024 2025 2024 2025 2024 2025 2024 Chg Brokerage, as reported $12,192 $9,934 $2,052 $1,686 $3,856 $3,069 $7.85 $7.46 5 % Net (gains) on divestitures (24) (24) (18) (18) (24) (24) (0.07) (0.08) Acquisition integration — — 194 143 257 191 0.73 0.63 Workforce and lease termination — — 136 88 183 118 0.53 0.39 Acquisition related adjustments — (26) 127 63 174 121 0.49 0.28 Amortization of intangible assets — — 668 486 — — 2.57 2.16 Effective income tax rate impact — — — (7) — — — (0.03) Levelized foreign currency translation — 57 — 8 — 13 — 0.04 Brokerage, as adjusted \* 12,168 9,941 3,159 2,449 4,446 3,488 12.10 10.85 12 % Risk Management, as reported 1,585 1,451 183 175 313 290 0.70 0.78 (10) % Net (gains) on divestures (2) — (1) — (2) — — — Acquisition integration — — 7 2 9 3 0.03 0.01 Workforce and lease termination — — 9 6 12 7 0.03 0.03 Acquisition related adjustments — — 3 — 4 — 0.01 — Amortization of intangibles assets — — 16 10 — — 0.06 0.04 Levelized foreign currency translation — (1) — — — — — — Risk Management, as adjusted \* 1,583 1,450 217 193 336 300 0.83 0.86 (3) % Corporate, as reported 1 16 (732) (390) (491) (234) (2.81) (1.74) Transaction-related costs — — 107 26 122 32 0.41 0.12 Legal, tax and benefit plan related — — 42 3 78 — 0.16 0.02 Clean energy-related — (5) — (2) — (2) — (0.01) Corporate, as adjusted \* 1 11 (583) (363) (291) (204) (2.24) (1.61) Total Company, as reported $13,778 $11,401 $1,503 $1,471 $3,678 $3,125 $5.74 $6.50 (12) % Total Company, as adjusted \* $13,752 $11,402 $2,793 $2,279 $4,491 $3,584 $10.69 $10.10 6 % Total Brokerage and Risk Management, as reported $13,777 $11,385 $2,235 $1,861 $4,169 $3,359 $8.55 $8.24 4 % Total Brokerage and Risk Management, as adjusted \* $13,751 $11,391 $3,376 $2,642 $4,782 $3,788 $12.93 $11.71 10 % \* For the year ended December 31, 2025, the pretax impact of the brokerage segment adjustments totals $1,482 million, mostly due to non-cash period expenses related to intangible amortization, with a corresponding adjustment to the provision for income taxes of $375 million relating to these items. For the year ended December 31, 2025, the pretax impact of the risk management segment adjustments totals $45 million, with a corresponding adjustment to the provision for income taxes of $11 million relating to these items. For the year ended December 31, 2025, the pretax impact of the corporate segment adjustments totals $200 million, with a corresponding adjustment to the benefit for income taxes of $51 million relating to these items and other tax items noted on page 56. For the corporate segment, the clean energy related adjustments are described on page 56. 37

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Reconciliation of Non-GAAP Measures - Pre-tax Earnings and Diluted Net Earnings per Share (In millions except share and per share data) Earnings (Loss) Before Income Taxes Provision (Benefit) for Income Taxes Net Earnings (Loss) Net Earnings (Loss) Attributable to Noncontrolling Interests Net Earnings (Loss) Attributable to Controlling Interests Diluted Net Earnings (Loss) per Share Year Ended Dec 31, 2025 Brokerage, as reported $2,759 $707 $2,052 $9 $2,043 $7.85 Net (gains) on divestitures (24) (6) (18) — (18) (0.07) Acquisition integration 257 63 194 — 194 0.73 Workforce and lease termination 183 47 136 — 136 0.53 Acquisition related adjustments 172 45 127 — 127 0.49 Amortization of intangible assets 894 226 668 — 668 2.57 Brokerage, as adjusted $4,241 $1,082 $3,159 $9 $3,150 $12.10 Risk Management, as reported $249 $66 $183 $— $183 $0.70 Net (gains) on divestitures (2) (1) (1) — (1) — Acquisition integration 9 2 7 — 7 0.03 Workforce and lease termination 12 3 9 — 9 0.03 Acquisition related adjustments 4 1 3 — 3 0.01 Amortization of intangible assets 22 6 16 — 16 0.06 Risk Management, as adjusted $294 $77 $217 $— $217 $0.83 Corporate, as reported $(1,137) $(405) $(732) $— $(732) $(2.81) Transaction-related costs 122 15 107 — 107 0.41 Legal, tax and benefit plan related 78 36 42 — 42 0.16 Corporate, as adjusted $(937) $(354) $(583) $— $(583) $(2.24) Year Ended Dec 31, 2024 Brokerage, as reported $2,259 $573 $1,686 $8 $1,678 $7.46 Net (gains) on divestitures (24) (6) (18) — (18) (0.08) Acquisition integration 191 48 143 — 143 0.63 Workforce and lease termination 118 30 88 — 88 0.39 Acquisition related adjustments 85 22 63 (3) 66 0.28 Amortization of intangible assets 651 165 486 — 486 2.16 Effective income tax rate impact — 7 (7) — (7) (0.03) Levelized foreign currency translation 13 5 8 — 8 0.04 Brokerage, as adjusted $3,293 $844 $2,449 $5 $2,444 $10.85 Risk Management, as reported $238 $63 $175 $— $175 $0.78 Acquisition integration 3 1 2 — 2 0.01 Workforce and lease termination 8 2 6 — 6 0.03 Amortization of intangible assets 14 4 10 — 10 0.04 Risk Management, as adjusted $263 $70 $193 $— $193 $0.86 Corporate, as reported $(622) $(232) $(390) $— $(390) $(1.74) Transaction-related costs 32 6 26 — 26 0.12 Legal and tax related — (3) 3 — 3 0.02 Clean energy related (2) — (2) — (2) (0.01) Corporate, as adjusted $(592) $(229) $(363) $— $(363) $(1.61) 38

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Acquisition of AssuredPartners and Woodruff Sawyer On August 18, 2025, we acquired all of the issued and outstanding stock of Dolphin TopCo, Inc., the holding company of AssuredPartners, Inc., a Delaware corporation (which we refer to, together with its subsidiaries, as "AssuredPartners") for gross consideration of $13.8 billion. AssuredPartners is a leading U.S. insurance broker with client capabilities across commercial property/casualty, specialty, employee benefits and personal lines with operations in the U.K. and Ireland. We raised $8.5 billion of cash in our December 11, 2024 follow-on common stock offering and borrowed $5.0 billion of cash in our December 19, 2024 senior notes issuance (which we refer to, together with the follow-on common stock offering, as the AssuredPartners Financing) to fund the transaction. On January 7, 2025, we received an additional $1.3 billion of cash due to the exercise by the underwriters of the overallotment provision related to the follow-on common stock offering. AssuredPartners had over 10,900 employees serving through offices located across the U.S., U.K. and Ireland. On April 10, 2025, we acquired all of the issued and outstanding stock of Woodruff-Sawyer & Co. (which we refer to as Woodruff Sawyer) for consideration of $1.2 billion. We funded the transaction using cash on hand. Woodruff Sawyer provides a full suite of commercial property/casualty products, employee benefits solutions and risk management services with a focus on middle and large market clients. Immediately prior to closing, Woodruff Sawyer had over 600 employees serving clients through 14 U.S. offices and one U.K. office. Insurance Market Overview Fluctuations in premiums charged by property/casualty underwriting enterprises have a direct and potentially material impact on the insurance brokerage industry. Commission revenues are generally based on a percentage of the premiums paid by insureds and normally follow premium levels. Insurance premiums are cyclical in nature and may vary widely based on market conditions. Various factors, including competition for market share among underwriting enterprises, increased underwriting capacity and improved economies of scale following consolidations, can result in flat or reduced property/casualty premium rates (a "soft" market). A soft market tends to put downward pressure on commission revenues. Various countervailing factors, such as greater than anticipated loss experience, unexpected loss exposure and capital shortages, can result in increasing property/casualty premium rates (a "hard" market). A hard market tends to favorably impact commission revenues. Hard and soft markets may be broad-based or more narrowly focused across individual product lines or geographic areas. As markets harden, buyers of insurance (such as our brokerage clients), have historically tried to mitigate premium increases and the higher commissions these premiums generate, including by raising their deductibles and/or reducing the overall amount of insurance coverage they purchase. As the market softens, or costs decrease, these trends have historically reversed. During a hard market, buyers may switch to negotiated fee in lieu of commission arrangements to compensate us for placing their risks, or may consider the alternative insurance market, which includes self-insurance, captives, rent-a-captives, risk retention groups and capital market solutions to transfer risk. Our brokerage units are very active in these markets as well. While increased use by insureds of these alternative markets historically has reduced commission revenue to us, such trends generally have been accompanied by new sales and renewal increases in the areas of risk management, claims management, captive insurance and self-insurance services and related growth in fee revenue. Inflation tends to increase the levels of insured values and risk exposures, resulting in higher overall premiums and higher commissions. However, the impact of hard and soft market fluctuations has historically had a greater impact on changes in premium rates, and therefore on our revenues, than inflationary pressures. We use the Council of Insurance Agents & Brokers (which we refer to as the CIAB) insurance pricing quarterly survey as an indicator of the insurance rate environment. The CIAB represents the leading domestic and international insurance brokers, who write approximately 85% of the commercial property/casualty premiums in the U.S. The fourth quarter 2025 survey had not been published as of the filing date of this report. The first three 2025 quarterly surveys indicated that U.S. commercial property/casualty rates increased by 4.2%, 3.7%, and 1.6% on average, for the first, second and third quarters of 2025, respectively, indicating overall continued price firming. We are seeing carrier competition across property related coverages and continued caution within casualty lines, particularly in the U.S. We believe these trends are likely to persist throughout 2026. We estimate global insured natural catastrophe losses were approximately $129 billion during 2025, below the 5-year annual average loss of $155 billion. More normalized global loss activity during 2026 may cause insurance and/or reinsurance carriers to increase property pricing upon renewal. Additionally, elevated loss trends and continued profitability concerns within casualty coverages, could lead to a more difficult rate and conditions environment in certain lines. The combination of increasing insurable values (due to inflation, including wage inflation), a tight labor market and low unemployment is likely contributing to increases in client insured exposures. 39

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We expect that our history of strong new business generation, solid retentions and enhanced value-added services for our carrier partners should all result in further organic growth opportunities around the world. Our professionals can demonstrate their expertise and high-quality, value-added capabilities by strengthening our clients' insurance portfolios and delivering insurance and risk management solutions within our clients' budget. Business Combinations and Dispositions See Note 3 to our 2025 consolidated financial statements for a discussion of our 2025 business combinations. Results of Operations Information Regarding Non-GAAP Measures and Other In the discussion and analysis of our results of operations that follows, in addition to reporting financial results in accordance with GAAP, we provide information regarding EBITDAC, EBITDAC margin, adjusted EBITDAC, adjusted EBITDAC margin, diluted net earnings per share, as adjusted (adjusted EPS), adjusted revenue, adjusted compensation and operating expenses, adjusted compensation expense ratio, adjusted operating expense ratio and organic revenue. These measures are not in accordance with, or an alternative to, the GAAP information provided in this report. We believe that these presentations provide useful information to management, analysts and investors regarding financial and business trends relating to our results of operations and financial condition or because they provide investors with measures that our chief operating decision maker uses when reviewing the Company's performance. See further below for definitions and additional reasons each of these measures is useful to investors. Our industry peers may provide similar supplemental non- GAAP information with respect to one or more of these measures, although they may not use the same or comparable terminology and may not make identical adjustments. The non-GAAP information we provide should be used in addition to, but not as a substitute for, the GAAP information provided. As disclosed in our most recent Proxy Statement, we make determinations regarding certain elements of executive officer incentive compensation, performance share awards and annual cash incentive awards, partly on the basis of measures related to adjusted EBITDAC. Adjusted Non-GAAP presentation - We believe that the adjusted non-GAAP presentation of our 2025 and 2024 information, presented on the following pages, provides stockholders and other interested persons with useful information regarding certain financial metrics that may assist such persons in analyzing our operating results as they develop a future earnings outlook for us. The after-tax amounts related to the adjustments were computed using the normalized effective tax rate for each respective period. • Adjusted measures - Revenues (for the brokerage segment), revenues before reimbursements (for the risk management segment), net earnings, compensation expense and operating expense, respectively, each adjusted to exclude the following, as applicable: ◦ Net gains (losses) on divestitures, which are primarily net proceeds received related to sales of books of business and other divestiture transactions, such as the disposal of a business through sale or closure. ◦ Acquisition integration costs, which include costs related to certain large acquisitions (including the acquisitions of the Willis Towers Watson plc treaty reinsurance brokerage operations (which we refer to as Willis Re), Buck, Cadence Insurance, Eastern Insurance, My Plan Manager, Woodruff Sawyer and AssuredPartners), outside the scope of our usual tuck-in strategy, not expected to occur on an ongoing basis in the future once we fully assimilate the applicable acquisition. These costs are typically associated with redundant workforce, compensation expense related to amortization of certain retention bonus arrangements, extra lease space, duplicate services and external costs incurred to assimilate the acquisition into our IT related systems. ◦ Transaction-related costs, which are associated with completed, future and terminated acquisitions. Costs primarily relate to the acquisitions of Willis Re, Buck, Cadence Insurance, Eastern Insurance, all of which closed in 2023, as well as Woodruff Sawyer and AssuredPartners, which closed in April 2025 and August 2025, respectively. These include costs related to regulatory filings, legal and accounting services, insurance and incentive compensation. 40

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◦ Workforce related charges, which primarily include severance costs (either accrued or paid) related to employee terminations and other costs associated with redundant workforce. ◦ Lease termination related charges, which primarily include costs related to terminations of real estate leases and abandonment of leased space. ◦ Acquisition related adjustments principally relate to changes in estimated acquisition earnout payables adjustments and acquisition related compensation charges. In addition, from time to time may include changes in balance sheet estimates arising from conforming accounting principles, purchase-related true-ups and other balance sheet adjustments made after the closing date; the net impact on the results for first quarter 2024 was approximately $26 million of revenues and approximately $28 million of compensation expense. ◦ Amortization of intangible assets which reflects the amortization of customer/ expiration lists, non-compete agreements, trade names and other intangible assets acquired through our merger and acquisition strategy, the impact to amortization expense of acquisition valuation adjustments to these assets as well as non-cash impairment charges. ◦ The impact of foreign currency translation, as applicable. The amounts excluded with respect to foreign currency translation are calculated by applying current year foreign exchange rates to the same period in the prior year. ◦ Effective income tax rate impact, which levelizes the prior year for the change in current year tax rates. ◦ Legal and tax related, which represents the impact of adjustments in 2025 and 2024 related to costs associated with legal and tax matters. ◦ Benefit plan related, which represents the impact of adjustments in 2025 related to costs associated with the termination of the Gallagher U.S. defined pension plan and other benefit plan changes. • Adjusted ratios - Adjusted compensation expense and adjusted operating expense, respectively, each divided by adjusted revenues. Non-GAAP Earnings Measures • EBITDAC and EBITDAC Margin - EBITDAC is net earnings before interest, income taxes, depreciation, amortization and the change in estimated acquisition earnout payables and EBITDAC margin is EBITDAC divided by total revenues (for the brokerage segment) and revenues before reimbursements (for the risk management segment). These measures for the brokerage and risk management segments provide a meaningful representation of our operating performance for the overall business and provide a meaningful way to measure our financial performance on an ongoing basis. • EBITDAC, as Adjusted and EBITDAC Margin, as Adjusted - Adjusted EBITDAC is EBITDAC adjusted to exclude net gains on divestitures, acquisition integration costs, workforce related charges, lease termination related charges, acquisition related adjustments, transaction related costs, and the period-over-period impact of foreign currency translation, as applicable and Adjusted EBITDAC margin is Adjusted EBITDAC divided by total adjusted revenues (defined above). These measures for the brokerage and risk management segments provide a meaningful representation of our operating performance, and are also presented to improve the comparability of our results between periods by eliminating the impact of the items that have a high degree of variability. • EPS, as Adjusted and Net Earnings, as Adjusted - Adjusted net earnings have been adjusted to exclude the after-tax impact of net gains on divestitures, acquisition integration costs, the impact of foreign currency translation, workforce related charges, lease termination related charges, acquisition related adjustments, transaction related costs, 41

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amortization of intangible assets, and effective income tax rate impact, as applicable. Adjusted EPS is Adjusted Net Earnings divided by diluted weighted average shares outstanding. This measure provides a meaningful representation of our operating performance (and as such should not be used as a measure of our liquidity), and for the overall business is also presented to improve the comparability of our results between periods by eliminating the impact of the items that have a high degree of variability. Organic Revenues (a non-GAAP measure) - Organic revenue change measures the year-over-year percentage change in organic revenue. For the brokerage segment, organic revenue consists of base commission and fee revenues, supplemental revenues and contingent revenues excludes the first twelve months of such revenues generated from acquisitions and such revenues related to divested operations which include disposals of a business through sale or closure, estimate changes, run-off of a business and the restructuring and/or repricing of programs and products in each year presented. Such revenues are excluded from organic revenues in order to help interested persons analyze the revenue growth associated with the operations that were a part of our business in both the current and prior year. In order to improve the comparability of our results between periods, we further exclude the period-over-period impact of foreign currency translation; revenue from certain large life product sales within Gallagher's Executive Life and Benefits practice group (which are typically large, singular transactions with a high degree of variability in amount and timing); and revenue attributable to changes in assumptions used to calculate estimated deferred revenues, which impact the quarterly timing of revenues during the annual contract period. For the risk management segment, organic revenues consists of fee revenues excludes the first twelve months of such revenues generated from acquisitions and such revenues related to divested operations in each year presented. In order to improve the comparability of our results between periods, we further exclude the period-over-period impact of foreign currency translation These revenue items are excluded from organic revenues in order to determine a comparable, but non-GAAP, measurement of revenue growth that is associated with the revenue sources that are expected to continue in the current year and beyond as well as eliminating the impact of the items that have a high degree of variability. We have historically viewed organic revenue growth as an important indicator when assessing and evaluating the performance of our brokerage and risk management segments. We also believe that using this non-GAAP measure allows readers of our financial statements to measure, analyze and compare the growth from our brokerage and risk management segments in a meaningful and consistent manner. Reconciliation of Non-GAAP Information Presented to GAAP Measures - This report includes tabular reconciliations to the most comparable GAAP measures, as follows: for EBITDAC (on pages 45 and 51), for adjusted revenues, adjusted EBITDAC and adjusted diluted net earnings per share (on page 37), for organic revenue measures (on pages 46 and 51), respectively, for the brokerage and risk management segments, for adjusted compensation and operating expenses and adjusted EBITDAC margin (on page 48), respectively, for the brokerage segment and (on page 52) for the risk management segment. Brokerage The brokerage segment accounted for 87% of our revenue in 2025. Our brokerage segment is primarily comprised of retail, wholesale and reinsurance brokerage operations. Our brokerage segment generates revenues by: • Identifying, negotiating and placing all forms of insurance (or insurance-like) coverage, as well as providing data analytics, risk-shifting, risk-sharing and risk-mitigation consulting services, principally related to property/casualty, life, health, welfare and disability insurance. We also provide these services through, or in conjunction with, other unrelated agents and brokers, consultants and management advisors; • Identifying, negotiating and placing all forms of reinsurance coverage, as well as providing capital markets services, including acting as underwriter, with respect to insurance linked securities, weather derivatives, capital raising and selected merger and acquisition advisory activities; • Acting as an agent or broker for multiple underwriting enterprises by providing services such as sales, marketing, selecting, negotiating, underwriting, servicing and placing insurance coverage on their behalf; • Providing consulting services related to health and welfare benefits, voluntary benefits, executive benefits, compensation, retirement planning, institutional investment and 42

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fiduciary, actuarial, compliance, private insurance exchange, human resources technology, communications and benefits administration; and • Providing management and administrative services to captives, pools, risk-retention groups, healthcare exchanges, small underwriting enterprises, such as accounting, claims and loss processing assistance, feasibility studies, actuarial studies, data analytics and other administrative services. The primary source of revenues for our brokerage services is commissions from underwriting enterprises, based on a percentage of premiums paid by our clients, or fees received from clients based on an agreed level of service usually in lieu of commissions. Commissions are fixed at the contract effective date and generally are based on a percentage of premiums for insurance coverage or employee headcount for employer sponsored benefit plans. Commissions depend upon a large number of factors, including the type of risk being placed, the particular underwriting enterprise's demand, the expected loss experience of the particular risk of coverage, and historical benchmarks surrounding the level of effort necessary for us to place and service the insurance contract. Rather than being tied to the amount of premiums, fees are most often based on an expected level of effort to provide our services. In addition, under certain circumstances, both retail brokerage and wholesale brokerage services receive supplemental and contingent revenues. Supplemental revenue is revenue paid by an underwriting enterprise that is above the base commission paid, is determined by the underwriting enterprise and is established annually in advance of the contractual period based on historical performance criteria. Contingent revenue is revenue paid by an underwriting enterprise based on the overall profit and/or volume of the business placed with that underwriting enterprise during a particular calendar year and is determined after the contractual period. 43

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Financial information relating to our brokerage segment results for 2025 and 2024 (in millions, except per share, percentages and workforce data): Statement of Earnings 2025 2024 Change Commissions $8,024 $6,694 $1,330 Fees 2,646 2,193 453 Supplemental revenues 466 359 107 Contingent revenues 324 268 56 Interest income, premium finance revenues and other income 732 420 312 Total revenues 12,192 9,934 2,258 Compensation 6,660 5,502 1,158 Operating 1,676 1,363 313 Depreciation 159 133 26 Amortization 894 651 243 Change in estimated acquisition earnout payables 44 26 18 Total expenses 9,433 7,675 1,758 Earnings before income taxes 2,759 2,259 500 Provision for income taxes 707 573 134 Net earnings 2,052 1,686 366 Net earnings attributable to noncontrolling interests 9 8 1 Net earnings attributable to controlling interests $2,043 $1,678 $365 Diluted net earnings per share $7.85 $7.46 $0.39 Other Information Change in diluted net earnings per share 5 % 41 % Growth in revenues 23 % 15 % Organic change in commissions and fees 6 % 7 % Compensation expense ratio 55 % 55 % Operating expense ratio 14 % 14 % Effective income tax rate 26 % 25 % Workforce at end of period (includes acquisitions) 55,561 42,091 Identifiable assets at December 31 $51,545 $46,439 44

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The following provides information that management believes is helpful when comparing EBITDAC and adjusted EBITDAC for 2025 and 2024 (in millions): 2025 2024 Change Net earnings, as reported $2,052 $1,686 22 % Provision for income taxes 707 573 Depreciation 159 133 Amortization 894 651 Change in estimated acquisition earnout payables 44 26 EBITDAC 3,856 3,069 26 % Net (gains) on divestitures (24) (24) Acquisition integration 257 191 Workforce and lease termination related charges 183 118 Acquisition related adjustments 174 121 Levelized foreign currency translation — 13 EBITDAC, as adjusted $4,446 $3,488 27 % Net earnings margin, as reported \* 16.8% 17.0% - 14 bpts EBITDAC margin, as adjusted \* 36.5% 35.1% + 145 bpts Reported revenues $12,192 $9,934 Adjusted revenues - see page 37 $12,168 $9,941 \* 2025 and 2024 adjusted EBITDAC margin includes approximately $363 million and $20 million, respectively, of interest income revenues earned on the proceeds received in December 2024 related to the AssuredPartners Financing. Commissions and fees - The aggregate increase in base commissions and fees for 2025 was due to revenues associated with acquisitions, divested operations and other that were made during 2025 and 2024 ($1,598 million) and organic revenue growth. Commission revenues increased 20% and fee revenues increased 21% in 2025 compared to 2024. The organic change in base commission and fee revenues was 6% in 2025 and 7% in 2024. In our property/casualty brokerage operations, during the twelve-month period ended December 31, 2025, we saw strong customer retention and, new business generation, in addition to continued renewal premiums increases (premium rates and exposures). We believe these favorable trends should continue in 2026; however, if economic conditions worsen or renewal premium increases slow, we could see our revenue growth be lower than growth in 2025. 45

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Items excluded from organic revenue computations yet impacting revenue comparisons for 2025 and 2024 include the following (in millions): Year Ended December 31, 2025 2024 Change Base Commissions and Fees Commission and fees, as reported $10,670 $8,887 20 % Less commission and fee revenues from acquisitions, divested operations and other (1,598) (351) Levelized foreign currency translation — 48 Organic base commission and fees $9,072 $8,584 6 % Supplemental revenues Supplemental revenues, as reported $466 $359 30 % Less supplemental revenues from acquisitions, divested operations and other (33) — Levelized foreign currency translation — 3 Organic supplemental revenues $433 $362 20 % Contingent revenues Contingent revenues, as reported $324 $268 21 % Less contingent revenues from acquisitions, divested operations and other (43) — Levelized foreign currency translation — 1 Organic contingent revenues $281 $269 5 % Total reported commissions, fees, supplemental revenues and contingent revenues $11,460 $9,514 20 % Less commissions, fees, supplemental revenues and contingent revenues from acquisitions, divested operations and other (1,674) (351) Levelized foreign currency translation — 52 Total organic commissions, fees supplemental revenues and contingent revenues $9,786 $9,215 6 % Acquisition Activity 2025 2024 Number of acquisitions closed 31 46 Estimated annualized revenues acquired (in millions) $3,508 $363 For 2025 and 2024, we issued 58,000 and 512,000, shares, respectively, of our common stock at the request of sellers and/ or in connection with tax-free exchange acquisitions. On December 19, 2024, we closed and funded an offering of $5,000 million of unsecured senior notes in five tranches. The $750 million aggregate principal amount of 4.60% Senior Notes is due in 2027, $750 million aggregate principal amount of 4.85% Senior Notes is due in 2029, $500 million aggregate principal amount of 5.00% Senior Notes is due in 2032, $1,500 million aggregate principal amount of 5.15% Senior Notes is due in 2035, $1,500 million aggregate principal amount 5.55% Senior Notes is due in 2055. The weighted average interest rate is 5.25% per annum after giving effect to underwriting costs and a net hedge gain. During 2024, we entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash gain of approximately $4 million on the hedging transactions that will be recognized on a pro rata basis as a decrease to our reported interest expense over ten years. We used the net proceeds of this offering to fund a portion of the cash consideration payable in connection with the AssuredPartners transaction and for general corporate purposes, including other acquisitions. 46

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On February 12, 2024, we closed and funded an offering of $1,000 million of unsecured senior notes in two tranches. The $500 million aggregate principal amount of 5.45% Senior Notes is due in 2034 and $500 million aggregate principal amount of 5.75% Senior Notes is due in 2054. The weighted average interest rate is 5.71% per annum after giving effect to underwriting costs and a net hedge loss. During 2023, we entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash loss of approximately $1 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over ten years. We used the proceeds of these offerings to fund acquisitions, earnout payments related to acquisitions and general corporate purposes. Supplemental and contingent revenues - Reported supplemental and contingent revenues recognized in 2025 and 2024 by quarter are as follows (in millions): Q1 Q2 Q3 Q4 Full Year 2025 Reported supplemental revenues $114 $103 $117 $132 $466 Reported contingent revenues 93 73 75 83 324 Reported supplemental and contingent revenues $207 $176 $192 $215 $790 2024 Reported supplemental revenues $94 $89 $79 $97 $359 Reported contingent revenues 86 60 69 53 268 Reported supplemental and contingent revenues $180 $149 $148 $150 $627 Interest income, premium finance revenues and other income - This primarily represents interest income earned on cash, cash equivalents and fiduciary cash and revenues from premium financing, income from equity investments and net gains related to divestitures and sales of books of business. Interest income, premium finance revenues and other income in 2025 increased compared to 2024 primarily due to increases in interest income earned on our own and fiduciary funds, including the $363 million interest income earned in 2025 related to the proceeds from the AssuredPartners Financing. The following table provides a reconciliation of brokerage segment interest income, premium finance revenues and other income, as reported in our consolidated financial statements to interest income earned on cash, cash equivalents and fiduciary cash (in millions): 2025 2024 Interest income, premium finance revenues and other income $732 $420 Less: Net (gains) on divestitures (24) (24) Premium financing revenues and net earnings from equity interests (113) (108) Interest income from cash, cash equivalents and fiduciary cash $595 $288 47

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Compensation expense - The following provides non-GAAP information that management believes is helpful when comparing 2025 and 2024 compensation expense (in millions): 2025 2024 Compensation expense, as reported $6,660 $5,502 Acquisition integration (135) (107) Workforce related charges (171) (108) Acquisition related adjustments (174) (147) Levelized foreign currency translation — 30 Compensation expense, as adjusted $6,180 $5,170 Reported compensation expense ratios 54.6 % 55.4 % Adjusted compensation expense ratios 50.8 % 52.0 % Reported revenues $12,192 $9,934 Adjusted revenues - see page 37 $12,168 $9,941 The $1,158 million increase in compensation expense in 2025 compared to 2024 was primarily due to compensation associated with the acquisitions completed in the twelve-month period ended December 31, 2025 - $875 million, increases in base compensation to service and support organic growth and employee benefit costs, partially offset by decreased incentive compensation - $165 million in the aggregate, workforce and lease termination related charges - $63 million, acquisition integration costs - $28 million, and acquisition earnout related adjustments - $27 million. Operating expense - The following provides non-GAAP information that management believes is helpful when comparing 2025 and 2024 operating expense (in millions): 2025 2024 Operating expense, as reported $1,676 $1,363 Acquisition integration (122) (84) Workforce and lease termination related charges (13) (10) Levelized foreign currency translation — 14 Operating expense, as adjusted $1,541 $1,283 Reported operating expense ratios 13.8 % 13.7 % Adjusted operating expense ratios 12.7 % 12.9 % Reported revenues $12,192 $9,934 Adjusted revenues - see page 37 $12,168 $9,941 The $313 million increase in operating expense in 2025 compared to 2024, was primarily due to expenses associated with the acquisitions completed in the twelve-month period ended December 31, 2025 - $233 million, additional investments in technology, partially offset by lesser real estate costs - $39 million in the aggregate, acquisition integration costs - $38 million, and workforce and lease termination related charges - $3 million. Depreciation - The increase in depreciation expense in 2025 compared to 2024 was due primarily to the impact of purchases of furniture, equipment and leasehold improvements related to office consolidations and moves, and expenditures related to upgrading computer systems. Also contributing to the increases in depreciation expense in 2025 was the depreciation expense associated with acquisitions completed in 2025 and the latter part of 2024. Amortization - The increase in amortization in 2025 compared to 2024 was primarily due to the impact of amortization expense of intangible assets associated with acquisitions completed in 2025 and 2024, partially offset by the impact of acquisition valuation true-ups recorded in 2025 relating to acquisitions made in 2025 and 2024. Expiration lists, non-compete agreements and trade names are amortized using the straight-line method over their estimated useful lives (two to fifteen years for expiration lists, two to six years for non-compete agreements and two to fifteen years for trade names). Based on the results of impairment reviews performed on amortizable intangible assets in 2025 and 2024, we wrote off $66 million and $19 million, respectively, of amortizable intangible assets related to the brokerage segment. We review all of our intangible assets for impairment periodically (at least annually for goodwill) and whenever events or 48

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changes in business circumstances indicate that the carrying value of the assets may not be recoverable. We perform such impairment reviews at the division (i.e., reporting unit) level with respect to goodwill and at the business unit level for amortizable intangible assets. In reviewing intangible assets, if the undiscounted future cash flows were less than the carrying amount of the respective (or underlying) asset, an indicator of impairment would exist and further analysis would be required to determine whether or not a loss would need to be charged against current period earnings as a component of amortization expense. In October 2025, we performed a qualitative impairment review on carrying value of our goodwill for all of our reporting units and no indicators of impairment were noted as of December 31, 2025. Change in estimated acquisition earnout payables - The change in the expense from the change in estimated acquisition earnout payables in 2025 compared to 2024 was due primarily to adjustments made to the estimated fair value of earnout obligations related to revised assumptions due to rising interest rates and increased market volatility and projections of future performance. During 2025 and 2024, we recognized $48 million and $61 million, respectively, of expense related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions made from 2022 to 2025. During 2025 and 2024, we recognized $4 million and $36 million of income, respectively, related to net adjustments in the estimated fair market values of earnout obligations in connection with revised projections of future performance for 126 and 91 acquisitions, respectively. The net adjustments in 2024 include changes made to the estimated fair value of the Willis Re acquisition earnout and reflect updated assumptions as of December 31, 2024 and are based on actual 2024 recognized revenues. The amounts initially recorded as earnout payables for our 2022 to 2025 acquisitions were measured at fair value as of the acquisition date and are primarily based upon the estimated future operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date. The fair value of these earnout obligations is based on the present value of the expected future payments to be made to the sellers of the acquired entities in accordance with the provisions outlined in the respective purchase agreements. In determining fair value, we estimate the acquired entity's future performance using financial projections developed by management for the acquired entity and market participant assumptions that were derived for revenue growth and/or profitability. We estimate future earnout payments using the earnout formula and performance targets specified in each purchase agreement and these financial projections. Subsequent changes in the underlying financial projections or assumptions will cause the estimated earnout obligations to change and such adjustments are recorded in our consolidated statement of earnings when incurred. Increases in the earnout payable obligations will result in the recognition of expense and decreases in the earnout payable obligations will result in the recognition of income. Provision for income taxes - The brokerage segment's effective tax rate in 2025 and 2024 was 25.6% and 25.4%, respectively. We anticipate reporting an effective tax rate of approximately 24.5% to 26.5% in our brokerage segment based on known changes in tax rates in future periods. Net earnings attributable to noncontrolling interests - The amounts reported in this line for 2025 and 2024 include noncontrolling interest earnings of $9 million and $8 million, respectively. Litigation, Regulatory and Taxation Matters - We routinely are involved in legal proceedings, claims, disputes, regulatory matters and governmental inspections or investigations arising in the ordinary course of or incidental to our business, including relating to E&O claims and those noted below in this section. We record accruals in the consolidated financial statements for pending litigation when we determine that an unfavorable outcome is probable and the amount of the loss can be reasonably estimated. For the matters we disclose that do not include an estimate of the amount of loss or range of losses, such an estimate is not possible or is immaterial, and we may be unable to estimate the possible loss or range of losses that could potentially result from the application of non-monetary remedies, unless disclosed below. We currently believe that the ultimate outcome of these proceedings, individually and in the aggregate, will not materially harm our financial position, results of operations or cash flows. However, legal proceedings and government investigations are subject to inherent uncertainties, and unfavorable rulings or other events could occur, including the payment of substantial monetary damages or an injunction or other order prohibiting us from selling one or more products at all or in particular ways, precluding particular business practices or requiring other remedies, which may result in a material adverse impact on our business, results of operations or financial position. As previously disclosed, our IRC 831(b) (or "micro-captive") advisory services business has been under a promoter investigation by the IRS since 2013. Among other matters, the IRS is investigating whether we have been acting as a tax shelter promoter in connection with these operations. Additionally, the IRS is conducting a criminal investigation related to IRC 831(b) micro-captive underwriting enterprises. We have been advised that we are not a target of the criminal investigation. We are fully cooperating with both matters. 49

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Risk Management The risk management segment accounted for 13% of our revenue in 2025. Our risk management segment operations provide contract claim settlement, claim administration, loss control services and risk management consulting for commercial, nonprofit, captive and public sector entities, and various other organizations that choose to self-insure property/casualty coverages or choose to use a third-party claims management organization rather than the claim services provided by underwriting enterprises. Revenues for our risk management segment are comprised of fees generally negotiated (i) on a per-claim or per-service basis, (ii) on a cost-plus basis, or (iii) as performance-based fees. We also provide risk management consulting services that are recognized as the services are delivered. Financial information relating to our risk management segment results for 2025 and 2024 (in millions, except per share, percentages and workforce data): Statement of Earnings 2025 2024 Change Fees $1,549 $1,414 $135 Interest income and other income 36 37 (1) Revenues before reimbursements 1,585 1,451 134 Reimbursements 164 154 10 Total revenues 1,749 1,605 144 Compensation 974 882 92 Operating 298 279 19 Reimbursements 164 154 10 Depreciation 40 38 2 Amortization 22 14 8 Change in estimated acquisition earnout payables 2 — 2 Total expenses 1,500 1,367 133 Earnings before income taxes 249 238 11 Provision for income taxes 66 63 3 Net earnings 183 175 8 Net earnings attributable to noncontrolling interests — — — Net earnings attributable to controlling interests $183 $175 $8 Diluted earnings per share $0.70 $0.78 $(0.08) Other information Change in diluted earnings per share (10) % 11 % Growth in revenues (before reimbursements) 9 % 13 % Organic change in fees (before reimbursements) 6 % 8 % Compensation expense ratio (before reimbursements) 61 % 61 % Operating expense ratio (before reimbursements) 19 % 19 % Effective income tax rate 26 % 27 % Workforce at end of period (includes acquisitions) 10,889 10,339 Identifiable assets at December 31 $2,274 $1,662 50

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The following provides non-GAAP information that management believes is helpful when comparing 2025 and 2024 EBITDAC and adjusted EBITDAC (in millions): 2025 2024 Change Net earnings, as reported $183 $175 5 % Provision for income taxes 66 63 Depreciation 40 38 Amortization 22 14 Change in estimated acquisition earnout payables 2 — Total EBITDAC 313 290 8 % Net (gains) on divestitures (2) — Acquisition integration 9 3 Workforce and lease termination related charges 12 7 Acquisition related adjustments 4 — Levelized foreign currency translation — — EBITDAC, as adjusted $336 $300 12 % Net earnings margin, before reimbursements, as reported 11.6 % 12.1 % - 51 bpts EBITDAC margin, before reimbursements, as adjusted 21.2 % 20.7 % + 54 bpts Reported revenues before reimbursements $1,585 $1,451 Adjusted revenues - before reimbursements - see page 37 $1,583 $1,450 Fees - In 2025, new business production was strong, while client retention remained excellent relative to 2024. We believe these favorable net new business trends should continue for 2026, however, worsening economic conditions or a reversal in the number of workers employed, could cause fewer new liability and core workers' compensation claims to arise in future quarters. Organic change in fee revenues was 6% in 2025 and 8% in 2024. Items excluded from organic fee computations yet impacting revenue comparisons in 2025 and 2024 include the following (in millions): Year Ended December 31, 2025 2024 Change Fees $1,538 $1,406 9 % International performance bonus fees 11 8 Fees as reported 1,549 1,414 10 % Less fees from acquisitions (60) — Less divested operations — (9) Levelized foreign currency translation — (1) Organic fees $1,489 $1,404 6 % Acquisition Activity 2025 2024 Number of acquisitions closed 2 2 Estimated annualized revenues acquired (in millions) $54 $24 Reimbursements - Reimbursements represent amounts received from clients reimbursing us for certain third-party costs associated with providing our claims management services. In certain service partner relationships, we are considered a principal because we direct the third party, control the specified service and combine the services provided into an 51

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integrated solution. Given this principal relationship, we are required to recognize revenue on a gross basis and service partner vendor fees in the operating expense line in our consolidated statement of earnings. Interest income and other income - Interest income and other income primarily represents interest income earned on cash, cash equivalents and fiduciary cash. Interest income and other income in 2025 remained relatively flat compared to 2024 primarily due to interest income earned on fiduciary cash. Compensation expense - The following provides non-GAAP information that management believes is helpful when comparing 2025 and 2024 compensation expense compensation expense (in millions): 2025 2024 Compensation expense, as reported $974 $882 Acquisition integration (3) (2) Workforce and lease termination related charges (9) (4) Acquisition related adjustments (4) — Levelized foreign currency translation — (2) Compensation expense, as adjusted $958 $874 Reported compensation expense ratios (before reimbursements) 61.5 % 60.8 % Adjusted compensation expense ratios (before reimbursements) 60.5 % 60.3 % Reported revenues (before reimbursements) $1,585 $1,451 Adjusted revenues (before reimbursements) - see page 37 $1,583 $1,450 The $92 million increase in compensation expense in 2025 compared to 2024 was primarily due to increases in base and incentive compensation to service and support organic growth as well as employee benefit costs - $43 million in the aggregate, compensation associated with the acquisitions completed in the twelve-month period ended December 31, 2025 - $39 million, workforce and lease termination related charges - $5 million, acquisition earnout related adjustments - $4 million, and acquisition integration related costs - $1 million. Operating expense - The following provides non-GAAP information that management believes is helpful when comparing 2025 and 2024 operating expense operating expense (in millions): 2025 2024 Operating expense, as reported $298 $279 Acquisition integration (6) (1) Workforce and lease termination related charges (3) (3) Levelized foreign currency translation — 1 Operating expense, as adjusted $289 $276 Reported operating expense ratios (before reimbursements) 18.8 % 19.2 % Adjusted operating expense ratios (before reimbursements) 18.3 % 19.0 % Reported revenues (before reimbursements) $1,585 $1,451 Adjusted revenues - (before reimbursements) see page 37 $1,583 $1,450 The $19 million increase in operating expense in 2025 compared to 2024 was primarily due to expenses associated with the acquisitions completed in the twelve-month period ended December 31, 2024 - $9 million, acquisition integration costs - $5 million, additional investments in technology, partially offset by lesser client-related expenses - $5 million in the aggregate. Depreciation - Depreciation expense increased in 2025 compared to 2024, which reflects the impact of expenditures related to upgrading computer systems, partially offset by office consolidations that occurred as leases expired in 2025 (less depreciation associated with furniture, equipment and leasehold improvements). Also contributing to the increase in depreciation expense in 2025 was the depreciation expense associated with the acquisitions completed in 2025 and the latter part of 2024. 52

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Amortization - Amortization expense increased in 2025 compared to 2024. The increase in amortization in 2025 compared to 2024 was primarily due to the impact of amortization expense of intangible assets associated with the acquisitions completed in 2025 and 2024. Based on the results of impairment reviews performed on amortizable intangible assets during 2025 and 2024, there were no impairments of amortizable assets related to the risk management segment. Change in estimated acquisition earnout payables - The change in estimated acquisition earnout payables in 2025 and 2024, primarily relates to accretion of discount in 2025 and 2024 relates to the estimated fair value of the earnout obligations. During 2025 and 2024, we recognized $2 million and zero, respectively, of expense related to the accretion of the discount recorded for earnout obligations in connection with our 2022 to 2025 acquisitions, respectively. During 2025 and 2024, there were no net adjustments in the estimated fair value of earnout obligations related to projections of future performance for acquisitions. Provision for income taxes - We allocate the provision for income taxes to the risk management segment using local statutory rates. The risk management segment's effective tax rate in 2025 and 2024 was 26.4% and 26.6%, respectively. We anticipate reporting an effective tax rate on adjusted results of approximately 25.0% to 27.0% in our risk management segment based on known changes in tax rates in future periods. Corporate The corporate segment reports the financial information related to our debt, external acquisition-related expenses, other corporate costs, the impact of foreign currency remeasurement and clean energy investments. See Note 7 to our 2025 consolidated financial statements for a summary of our debt at December 31, 2025 and 2024. Financial information relating to our corporate segment results for 2025 and 2024 (in millions, except per share and percentages): Statement of Earnings 2025 2024 Change Other income $1 $16 $(15) Total revenues 1 16 (15) Compensation 208 138 70 Operating 284 112 172 Interest 639 381 258 Depreciation 7 7 — Total expenses 1,138 638 500 Loss before income taxes (1,137) (622) (515) Benefit for income taxes (405) (232) (173) Net loss (732) (390) (342) Net loss attributable to noncontrolling interests — — — Net loss attributable to controlling interests $(732) $(390) $(342) Diluted net loss per share $(2.81) $(1.74) $(1.07) Identifiable assets at December 31 $16,846 $16,154 EBITDAC Net loss $(732) $(390) $(342) Benefit for income taxes (405) (232) (173) Interest 639 381 258 Depreciation 7 7 — EBITDAC $(491) $(234) $(257) Revenues - Revenues in the corporate segment consist of other income related to the run-off of legacy investments, and other investment income. 53

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Compensation expense - Compensation expense for 2025 and 2024 includes salary, incentive compensation, and associated benefit expenses of $208 million and $138 million, respectively. The change in 2025 compensation expense compared to 2024 was primarily due to increased incentive compensation, which includes transaction-related costs as described on page 56 in note (1) and increased base compensation, which includes transaction-related costs and benefit plan changes as described on page 56 in notes (1) and (4). Operating expense - Operating expense for 2025 includes banking and related fees of $4 million, external professional fees and other due diligence costs related to 2025 acquisitions of $108 million, which includes $91 million of transaction- related costs as described on page 56 in note (1), other corporate and clean energy related expenses, including litigation matters, technology and other professional fees of $125 million in aggregate, which includes costs associated with legal and tax matters and benefit plan changes as described on page 56 in notes (3) and (4), and a net unrealized foreign exchange remeasurement loss of $47 million. Operating expense for 2024 includes banking and related fees of $3 million, external professional fees and other due diligence costs related to 2024 acquisitions of $39 million, which includes $23 million of transaction-related costs as described on page 56 in note (1), other corporate and clean energy related expenses, including litigation matters, technology and other professional fees of $70 million in aggregate, and a net unrealized foreign exchange remeasurement loss of zero. Interest expense - The increase in interest expense in 2025 compared to 2024 was due to the following (in millions): Change in interest expense related to: 2025 / 2024 Interest on borrowings from our Credit Agreement $4 Interest on the maturity of the Series H notes (2) Interest on the maturity of the Series O notes (4) Interest on the maturity of the Series HH notes (1) Interest on the $1,000 million senior notes funded on February 15, 2024 7 Interest on the $5,000 million senior notes funded on December 19, 2024 254 Net change in interest expense $258 Depreciation - Depreciation expense in 2025 was flat compared to 2024, and includes capital improvements made at our corporate headquarters and Gallagher Centers of Excellence in 2025 and 2024 and to the acquisition of other corporate related fixed assets in 2025. Benefit for income taxes - We allocate the provision for income taxes to the brokerage and risk management segments using local statutory rates. Our consolidated effective tax rate was 19.7% and 21.5%, for 2025 and 2024, respectively. The tax rate for 2025 was lower than the statutory rate primarily due to the income tax benefit of stock based awards. The tax rate for 2024 was lower than the statutory rate primarily due to the income tax benefit of stock-based awards. There were no IRC Section 45 tax credits generated in 2025, 2024 and 2023. The income tax benefit of stock based awards that vested or were settled in the years ended December 31, 2025 and 2025 was $121 million and $89 million, respectively. Significant Future Income Tax Law Changes - On July 4, 2025, the One Big Beautiful Bill Act was enacted in the U.S. The OBBBA includes significant provisions, such as the permanent extension of certain expiring provisions of the Tax Cuts and Jobs Act, modifications to the international tax framework and the restoration of favorable tax treatment for certain business provisions. The legislation has multiple effective dates, with certain provisions effective in 2025 and others implemented through 2027. The application of the OBBBA does not have a material impact on our financial statements for 2025. The Organization for Economic Cooperation and Development continues to issue reports and recommendations as part of its Base Erosion and Profit Shifting project in 2021, it announced that 136 countries and tax jurisdictions agreed to implement a new Pillar 2 approach to international taxation. Pillar 1 exempts regulated financial institutions, and we believe we qualify for such exemption. Many countries in which we do business have adopted, or are expected to adopt, these rules which will change various aspects of the existing framework under which our tax obligations are determined. For example, the U.K., the majority of the E.U., Canada, Australia and New Zealand have now adopted nearly all aspects of these rules with limited variation 54

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from the OECD model rules. Other jurisdictions in which we do business also reacted to these efforts; for example, Bermuda enacted a corporate tax regime for the first time in 2023, which became effective in 2025. On January 5, 2026, OECD released additional administrative guidance on the application of Pillar 2 global minimum tax rules, which are designed to ensure that large multinational enterprise (MNE) groups are subject to a minimum effective tax rate of 15% in each jurisdiction in which they operate. This guidance introduces a package of new and expanded safe harbors and simplification measures, including a "side-by-side" safe harbor regime applicable to certain U.S.-parent MNE groups, extensions and modifications to existing transitional safe harbors, and additional rules addressing the treatment of tax incentives and effective tax rate calculations. The most significant element of this guidance is the "side-by-side" safe harbor which is intended to coordinate the Pillar 2 global minimum tax regime with certain domestic minimum tax systems, including those in the U.S. Subject to eligibility requirements and elections, this safe harbor may substantially reduce or eliminate the application of Pillar 2 "top-up taxes," including the Income Inclusion Rule and Undertaxed Profits Rule for affected MNE groups for fiscal years beginning on or after January 1, 2026. These developments, once actually enacted into domestic law by Pillar 2 adopters, significantly de-risk Pillar 2 exposure for US multinationals like Gallagher. Whether those enactments take effect from 2026 or later will need to be monitored and anticipated top-ups adjusted to reflect those enactment dates. Regardless of adoption of this new guidance, the domestic minimum top-up aspect of Pillar 2 (referred to as "QDMTT") and its related compliance aspects will remain for all multi-nationals that operate in jurisdictions that have enacted it. We anticipate further significant developments across several jurisdictions in which we operate in 2026 and 2027. Should the jurisdictions in which we operate, and those in which we and our subsidiaries are based, choose not to implement the OECD's January 2026 guidance in their domestic tax laws, we could be adversely affected by a top-up. We do not currently anticipate that amount would be material relative to our overall financial statements. U.S. Federal Income Tax Law Changes Items Impacting the Company Going Forward Alternative Minimum Tax Credit - The IRA enacted a book-based Corporate Alternative Minimum Tax (which we refer to as CAMT) for years beginning after 2022. The CAMT imposes a minimum 15% cash tax on adjusted book income before general business credits. The IRS issued guidance in the fourth quarter of this year on CAMT to revise the proposed CAMT regulations and to provide taxpayers clarity related to the application of CAMT. As such, we do not currently anticipate being subject to the CAMT and even if we were to find ourselves subject to it in a particular year, we do not believe there would be an impact on our earnings. Excise Tax On Stock Buybacks - The IRA adds a 1% surtax to corporate stock repurchases effective January 2023. Our board approved a common stock repurchase program in 2021. If we were to effectuate stock repurchases under this program, the excise tax would not have a material impact on our results of operations or cash flows. New Tax Credits for Renewable Energy - The IRA introduced new tax credits for certain renewable energy projects and onshoring certain manufacturing activities associated with those projects. While we continue to explore additional renewable energy investments, we do not currently anticipate significant benefits from these new incentive programs. 55

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The following provides non-GAAP information that we believe is helpful when comparing 2025 and 2024 operating results for the corporate segment (in millions): 2025 2024 Pretax Loss Income Tax Benefit Net Earnings (Loss) Attributable to Controlling Interests Pretax Loss Income Tax Benefit Net Earnings (Loss) Attributable to Controlling Interests Components of Corporate Segment, as reported Interest and banking costs $(642) $167 $(475) $(376) $97 $(279) Clean energy related (8) 3 (5) (6) 1 (5) Acquisition costs (1) (139) 17 (122) (51) 10 (41) Corporate (2) (348) 218 (130) (189) 124 (65) Reported Year Ended (1,137) 405 (732) (622) 232 (390) Adjustments Clean energy related — — — (2) — (2) Transaction-related costs (1) 122 (15) 107 32 (6) 26 Legal and tax related (3) 34 (25) 9 — 3 3 Benefit plan related (4) 44 (11) 33 — — — Components of Corporate Segment, as adjusted Interest and banking costs (642) 167 (475) (376) 97 (279) Clean energy related (8) 3 (5) (8) 1 (7) Acquisition costs (17) 2 (15) (19) 4 (15) Corporate (2) (270) 182 (88) (189) 127 (62) Adjusted Year Ended $(937) $354 $(583) $(592) $229 $(363) (1) We incurred transaction-related costs, which include legal, consulting, employee compensation and other professional fees associated with completed, future and terminated acquisitions. Adjustments primarily relate to our acquisitions of Willis Re, Buck, Cadence Insurance, Eastern Insurance, all of which closed in 2023, as well as Woodruff Sawyer and AssuredPartners, which closed in April 2025 and August 2025, respectively. (2) Corporate pretax loss includes a net unrealized foreign exchange remeasurement loss of $(47) million in the year ended December 31, 2025 and a net unrealized foreign exchange remeasurement loss of zero in the year ended December 31, 2024. (3) Adjustments in 2025 and 2024 include costs associated with legal and tax matters. (4) Adjustments in 2025 include costs associated with the termination of the Gallagher U.S defined pension plan and other benefit plan changes. Interest and banking costs and debt - Interest and banking costs includes expenses related to our debt. Clean energy related - For 2025, this consists of operating results related to our investments in new clean energy projects, primarily fusion and carbon sequestration projects. Acquisition costs - Consists mostly of external professional fees and other due diligence costs related to acquisitions. On occasion, we enter into forward currency hedges for the purchase price of committed, but not yet funded, acquisitions with funding requirements in currencies other than the U.S. dollar. The gains or losses, if any, associated with these hedge transactions are also included in acquisitions costs. Corporate - Consists of overhead allocations mostly related to corporate staff compensation, other corporate level activities, and net unrealized foreign exchange remeasurement. In addition, corporate includes the tax expense related to 56

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partial taxation of foreign earnings, nondeductible executive compensation and entertainment expenses, the tax benefit from vesting of employee equity awards, as well as other permanent or discrete tax items not reflected in the provision for income taxes in the brokerage and risk management segments. The income tax benefit of stock based awards that vested or were settled in the years ended December 31, 2025 and 2024 was $121 million and $89 million, respectively, and is included in the table above in the Corporate line. Liquidity and Capital Resources Liquidity describes the ability of a company to generate sufficient cash flows to meet the cash requirements of its business operations. The insurance brokerage and risk management industries are not capital intensive. Historically, our capital requirements have primarily included dividend payments on our common stock, repurchases of our common stock, funding of our investments, acquisitions of brokerage and risk management operations and capital expenditures, including investments being made in IT and software development projects. On August 18, 2025, we acquired all of the issued and outstanding stock of Dolphin TopCo., the holding company of AssuredPartners for gross consideration of $13.8 billion, which we funded with proceeds from the AssuredPartners Financing. On January 7, 2025, we received an additional $1.3 billion of cash due to the exercise by the underwriters of the overallotment provision related to the follow-on common stock offering. Refer to Note 3 for more information regarding the AssuredPartners Financing. Total expected expense to integrate AssuredPartners into our operations is approximately $575 million over three years. On April 10, 2025, we acquired all of the issued and outstanding stock of Woodruff Sawyer for a gross consideration of $1.2 billion. We funded the transaction using cash on hand. Total expected expense to integrate Woodruff Sawyer into our operations is approximately $150 million over three years. Operating Cash Flows Historically, we have depended on our ability to generate positive cash flow from operations to meet a substantial portion of our cash requirements. We believe that our cash flows from operations and borrowings under our Credit Agreement (as defined below) will provide us with adequate resources to meet our liquidity needs in the foreseeable future. To fund acquisitions made during 2025 and 2024, we relied on a combination of net cash flows from operations, proceeds from borrowings under our Credit Agreement, proceeds from issuances of senior unsecured notes and issuance of our common stock. Cash provided by operating activities was $1,930 million and $2,583 million for 2025 and 2024, respectively. The decrease in cash provided by operating activities during 2025 compared to the same period in 2024 was primarily due to an increase in payments on acquisition earnouts in excess of original estimates (primarily related to the acquisition of the Willis Towers Watson treaty reinsurance brokerage operations) and timing differences between periods with cash receipts and disbursements related to accounts receivables and accrued compensation and other current liabilities, partially offset by the growth in 2025 compared to 2024 in our reported net earnings, adjusted for non-cash items (i.e., EBITDAC). In April 2025, we made a $750 million earnout payment to the sellers related to the acquisition of the Willis Towers Watson treaty reinsurance brokerage operations in December 2021. Total cash and cash equivalents, restricted cash and fiduciary cash at December 31, 2025 and 2024, include $2,916 million and $15,372 million, respectively, of income earning money market accounts. The decrease in cash invested in money market accounts between years is primarily due to the proceeds received from the AssuredPartners Financing ($13.5 billion) and proceeds received in January 2025 from the exercise by the underwriters of the overallotment provision related to the follow-on-common stock offering ($1.3 billion) which were used to fund the acquisition of AssuredPartners that closed on August 18, 2025. The dividend income on money market accounts was recorded in interest income, premium finance and other income in our consolidated statement of earnings, which increased $296 million during 2025 ($363 million of which related to the proceeds from the AssuredPartners financing) to $769 million for the year ended December 31, 2025 compared to $473 million for the year ended December 31, 2024. During 2025 and 2024, employee matching contributions to the 401(k) plan of $115 million and $105 million, respectively, relating to 2024 and 2023 were funded using common stock. Our cash flows from operating activities are primarily derived from our earnings from operations, as adjusted, for our non- cash expenses, which include depreciation, amortization, change in estimated acquisition earnout payables, deferred compensation, restricted stock, and stock-based and other non-cash compensation expenses. Historically, cash provided by operating activities was unfavorably impacted if the amount of IRC Section 45 tax credits generated (which is the amount 57

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we recognized for financial reporting purposes) was greater than the amount of tax credits utilized to reduce our tax cash obligations. Excess tax credits produced in 2021 and 2020 resulted in an increase to our deferred tax assets, which was a net use of cash related to operating activities. In 2023, IRC Section 45 credits were no longer generated due to the IRC Section 45 program expiring as of December 31, 2021, and therefore the IRC Section 45 credit utilization against our cash tax obligation resulted in favorable cash flow in 2023. When assessing our overall liquidity, we believe that the focus should be on net earnings as reported in our consolidated statement of earnings, adjusted for non-cash items (i.e., EBITDAC), and cash provided by operating activities in our consolidated statement of cash flows. Consolidated EBITDAC was $3,678 million and $3,125 million for 2025 and 2024, respectively. Net earnings attributable to controlling interests were $1,494 million and $1,463 million for 2025 and 2024, respectively. We believe that EBITDAC items are indicators of trends in liquidity. Defined Benefit Pension Plan In 2025 we initiated a process to fully terminate the plan. In fourth quarter 2025, substantially all of the future obligations under the plan were settled through a combination of lump sum payments to eligible, electing participants and a transfer of the remaining liability through the purchase of a group annuity contract to a highly-rated third-party insurance company. As of December 31, 2025, the only remaining obligations are payments to the Pension Benefit Guaranty Corporation (which we refer to as the PBGC) for missing participants and the distribution of the surplus assets to plan participants. In 2026, after the liability for the missing participants has been transferred to the PBGC and the remaining assets have been distributed, the final plan termination accounting will be completed. In fourth quarter 2025, we recognized a non-cash, pre- tax loss of approximately $16 million to operating expense in the consolidated statement of earnings that was offset by an approximate $12 million adjustment to consolidated statement of comprehensive earnings and a $4 million reversal of a deferred tax asset. In 2026, based on estimates as of December 31, 2025, we expect to recognize a non-cash, pre-tax loss of approximately $17 million to operating expense in the consolidated statement of earnings related to the final plan termination accounting. We did not make any additional funding to the plan related to this plan termination process. Our policy for funding our defined benefit pension plan is to contribute amounts at least sufficient to meet the minimum funding requirements under the IRC. The Employee Retirement Security Act of 1974, as amended (which we refer to as ERISA), could impose a minimum funding requirement for our plan. We were not required to make any minimum contributions to the plan for the 2025 and 2024 plan years. Funding requirements are based on the plan being frozen and the aggregate amount of our historical funding. The plan's actuaries determine contribution rates based on our funding practices and requirements. Funding amounts may be influenced by future asset performance, the level of discount rates and other variables impacting the assets and/or liabilities of the plan. In addition, amounts funded in the future, to the extent not due under regulatory requirements, may be affected by alternative uses of our cash flows, including dividends, acquisitions and common stock repurchases. During 2025 and 2024 we did not make discretionary contributions to the legacy Company defined benefit plan. See Note 12 to our 2025 consolidated financial statements for additional information required to be disclosed relating to our defined benefit pension plan. We are required to recognize a prepaid pension asset for our overfunded defined benefit pension plan (which we refer to as the Plan). The offsetting adjustment to the asset required to be recognized for the Plan is recorded in "Accumulated Other Comprehensive Loss," net of tax, in our consolidated balance sheet. We will recognize subsequent changes in the funded status of the Plan through the income statement and as a component of comprehensive earnings, as appropriate, in the year in which they occur. Numerous items may lead to a change in funded status of the Plan, including actual results differing from prior estimates and assumptions, as well as changes in assumptions to reflect information available at the respective measurement dates. The net change in the funded status of the Plan in 2025 resulted in an increase in noncurrent assets in 2025 of $1 million. In 2025, the funded status of the Plan was unfavorably impacted by other assumption changes, the net impact of which was approximately $3 million. In addition, the funded status was favorably impacted by returns on the plan's assets being higher in 2025 than anticipated by approximately $4 million. The net change in the funded status of the Plan in 2024 resulted in an increase in noncurrent assets in 2024 of $4 million. In 2024, the funded status of the Plan was favorably impacted by an increase in the discount rates used in the measurement of the pension liabilities at December 31, 2024 and other assumption changes, the net impact of which was approximately $4 million. In addition, the funded status was unfavorably impacted by returns on the plan's assets being lower in 2024 than anticipated. 58

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Investing Cash Flows Capital Expenditures - Capital expenditures were $145 million and $142 million for 2025 and 2024, respectively. In 2025 and 2024 capital expenditures include amounts incurred related to office moves, investments made in IT and software development projects. Relating to the development of our corporate headquarters, we received property tax related credits under a tax-increment financing note from Rolling Meadows, Illinois and an Illinois state EDGE tax credit. Incentives from these two programs could total between $89 million and $100 million over a fifteen-year period. In 2026, we expect total expenditures for capital improvements to be approximately $227 million, (includes impact of acquisitions closed through December 31, 2025) part of which is related to expenditures on office moves and investments being made in IT and software development projects. The increase in the expected capital expenditures in 2026 compared to 2025 is primarily due to such projects. Acquisitions - Cash paid for acquisitions, net of cash and restricted cash acquired, was $15,766 million and $1,462 million in 2025 and 2024, respectively. The increased use of cash for acquisitions in 2025 compared to 2024 was primarily due to our acquisition of AssuredPartners. In addition, during 2025 and 2024 we issued 0.1 million shares ($30 million) and 0.6 million shares ($141 million), respectively, of our common stock as payment for a portion of the total consideration paid for acquisitions and earnout payments. We completed 33 and 48 acquisitions in 2025 and 2024, respectively. Annualized revenues of businesses acquired in 2025 and 2024 totaled approximately $3,562 million and $387 million, respectively. In 2026, we expect to use cash on hand, new debt, our Credit Agreement (as defined below), cash from operations and our common stock, or a combination thereof to fund all of the acquisitions we complete. If liquidity concerns arise, we may be more likely to use common stock to fund acquisitions. Dispositions - During 2025 and 2024, we sold several books of business and recognized one-time gains of $26 million and $24 million, respectively. We received cash proceeds of $17 million and $20 million for 2025 and 2024, respectively, related to these transactions. Financing Cash Flows At December 31, 2025, we had $9,550 million of Senior Notes, $3,323 million of corporate-related borrowings outstanding under separate note purchase agreements entered into during the period from 2014 to 2021, there were no borrowings outstanding under our Credit Agreement, $226 million outstanding under our Premium Financing Debt Facility and a cash and cash equivalent balance of $1,396 million. See Note 7 to our 2025 consolidated financial statements for a discussion of the terms of the Senior Notes, Note purchase agreements, the Credit Agreement (as defined below) and the Premium Financing Debt Facility. Consistent with past practice, as of December 31, 2025 we had pre-issuance hedges open for $1,500 million for 2026. The Senior Notes, Note Purchase Agreements, the Credit Agreement and the Premium Financing Debt Facility contain various financial covenants that require us to maintain specified financial ratios. We were in compliance with these covenants as of December 31, 2025. Senior Notes - On December 19, 2024, we closed and funded an offering of $5,000 million of unsecured senior notes in five tranches. The $750 million aggregate principal amount of 4.60% Senior Notes is due in 2027, $750 million aggregate principal amount of 4.85% Senior Notes is due in 2029, $500 million aggregate principal amount of 5.00% Senior Notes is due in 2032, $1,500 million aggregate principal amount of 5.15% Senior Notes is due in 2035, $1,500 million aggregate principal amount 5.55% Senior Notes is due in 2055. The weighted average interest rate is 5.25% per annum after giving effect to underwriting costs and a net hedge gain. During 2024, we entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash gain of approximately $4 million on the hedging transactions that will be recognized on a pro rata basis as a decrease to our reported interest expense over ten years. We used the net proceeds of this offering to fund a portion of the cash consideration payable in connection with the AssuredPartners acquisition and for general corporate purposes including other acquisitions. On February 12, 2024, we closed and funded an offering of $1,000 million of unsecured senior notes in two tranches. The $500 million aggregate principal amount of 5.45% Senior Notes is due in 2034 and $500 million aggregate principal amount of 5.75% Senior Notes is due in 2054. The weighted average interest rate is 5.71% per annum after giving effect to underwriting costs and a net hedge loss. During 2024, we entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash loss of approximately $1 million on the hedging transactions that will be 59

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recognized on a pro rata basis as an increase to our reported interest expense over ten years. We used the proceeds of these offerings to fund acquisitions, earnout payments related to acquisitions and general corporate purposes. Note Purchase Agreement - During June 2025, we used operating cash to fund the $200 million Series O note maturity that had a fixed rate of 4.31% that was due June 24, 2025. During February 2024, we used operating cash to fund the $100 million Series HH note maturity that had a fixed rate of 4.72% that was due February 13, 2024 and the $325 million Series H note maturity that had a fixed rate of 4.58% that was due February 27, 2024. Credit Agreement - On April 3, 2025, we entered into an amendment and restatement to our Credit Agreement dated June 22, 2023 (which, as amended and restated, refer to as the Credit Agreement). The Credit Agreement provides for a five- year unsecured revolving credit facility in the amount of $2,500 million, which is also available in Pounds Sterling, Canadian Dollars, Australian Dollars, New Zealand Dollars, Euros, Japanese Yen and any other currencies agreed by the lenders. The Credit Agreement also includes a $75 million letter of credit sub-facility and a $250 million Euro swingline sub-facility. We may also, upon the agreement of either one or more then-existing lenders or of additional banks not currently party to the Credit Agreement, increase the commitments under the Credit Agreement up to $3,000 million. The amendment and restatement, among other things, also extended the maturity date from June 22, 2028 to April 3, 2030 and updated the facility fee and applicable margin as determined by reference to the rating of our long-term senior unsecured debt. The Credit Agreement permits us to designate wholly-owned subsidiaries located in certain jurisdictions as additional borrowers, the obligations of which under the Credit Agreement will be guaranteed by the Company, subject to the terms and conditions set forth in the Credit Agreement. Any subsidiary that guarantees any notes under the Company's existing note purchase agreements is required to guarantee the obligations under the Credit Agreement. There are currently no subsidiary borrowers or guarantors under the Credit Agreement. Loans borrowed under the Credit Agreement bear interest at a variable annual rate based on a customary benchmark rate for each available currency including Secured Overnight Financing Rate (which we refer to as SOFR) for loans in U.S. Dollars, or at our election solely for loans in U.S. Dollars, the base rate, plus in each case an applicable margin. Interest rates on base rate loans and outstanding drawings on letters of credit under the Credit Agreement will be based on the Base Rate, as defined in the Credit Agreement, plus a margin of 0.00% to 0.375%, depending on the rating of our long-term senior unsecured debt. Interest rates for SOFR loans and loans in currencies other than U.S. dollars under the Credit Agreement will be based on, as applicable, a SOFR Daily Floating Rate, Term SOFR, Alternative Currency Daily Rate or Alternative Currency Term Rate, as defined in the Credit Agreement, plus a margin of 0.775% to 1.375%, depending on the rating of our long-term senior unsecured debt. The annual facility fee related to the Credit Agreement is between 0.100% and 0.250% of the revolving credit commitment, depending on the rating of our long-term senior unsecured debt. Subject to certain conditions stated in the Credit Agreement, we may borrow, prepay and reborrow amounts under the Credit Agreement at any time during the term of the Credit Agreement. Funds borrowed under the Credit Agreement may be used for general corporate and working capital purposes of the Company and its subsidiaries. The Credit Agreement also contains customary representations and warranties and affirmative and negative covenants, including financial covenants, as well as customary events of default, with corresponding grace periods, including, without limitation, payment defaults, cross-defaults to other agreements evidencing indebtedness and bankruptcy-related defaults. We were in compliance with these covenants as of December 31, 2025. There were no borrowings outstanding under the Credit Agreement at December 31, 2025. Due to the outstanding borrowing and letters of credit, $2,498 million remained available for potential borrowings under the Credit Agreement at December 31, 2025. We use the Credit Agreement to post letters of credit and to borrow funds to supplement our operating cash flows from time to time. During 2025, we borrowed an aggregate of $2,546 million and repaid $2,546 million under our Credit Agreement. During 2024, we borrowed an aggregate of $1,663 million and repaid $1,907 million under our Credit Agreement. Principal uses of the 2025 and 2024 borrowings under the Credit Agreement were to fund acquisitions, earnout payments related to acquisitions and general corporate purposes. Premium Financing Debt Facility - On November 17, 2025, we entered into an amendment to our revolving loan facility (which we refer to as the Premium Financing Debt Facility) that provides funding for the three Australian (AU) and New Zealand (NZ) premium finance subsidiaries. The Premium Financing Debt Facility is comprised of: (i) Facility B is separated into AU$390 million and NZ$25 million tranches (the AU$ tranche will be decreased on March 2, 2026 to 60

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AU$310 million and the NZ$ tranche will be decreased as of March 2, 2026 to NZ$10 million), (ii) Facility C, an AU$60 million equivalent multi-currency overdraft tranche and (iii) Facility D, a NZ$15 million equivalent multi-currency overdraft tranche. The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.300% and 1.850% for the AU$ and NZ$ tranches, respectively. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.780% and 0.990% for the AU$ and NZ$ tranches, respectively. The annual fee for Facility B is 0.52% and 0.8325% for the undrawn commitments for the AU$ and NZ$ tranches, respectively. The annual fee for Facility C is 0.77% and for Facility D is 0.90% of the total commitments of the facilities. The terms of our Premium Financing Debt Facility include various financial covenants, including covenants that require us to maintain specified financial ratios. We were in compliance with these covenants as of December 31, 2025. The Premium Financing Debt Facility also includes customary provisions for transactions of this type, including events of default, with corresponding grace periods and cross-defaults to other agreements evidencing our indebtedness. Facilities B, C and D are secured by the premium finance receivables of the Australian and New Zealand premium finance subsidiaries. At December 31, 2025, AU$325 million and NZ$0 million of borrowings were outstanding under Facility B, AU$0 million of borrowings outstanding under Facility C and NZ$15 million of borrowings were outstanding under Facility D, which in aggregate amount to US$226 million of borrowings outstanding under the Premium Financing Debt Facility. Accordingly, as of December 31, 2025, AU$65 million and NZ$25 million remained available for potential borrowing under Facility B, and AU$60 million and NZ$0 million under Facilities C and D, respectively. Dividends - Our board of directors determines our dividend policy. Our board of directors determines dividends on our common stock on a quarterly basis after considering our available cash from earnings, our anticipated cash needs and current conditions in the economy and financial markets. In 2025, we declared $674 million in cash dividends on our common stock, or $2.60 per common share. On December 19, 2025, we paid a fourth quarter dividend of $0.65 per common share to shareholders of record as of December 5, 2025. On January 28, 2026, we announced a quarterly dividend for first quarter 2026 of $0.70 per common share. If the dividend is maintained at $0.70 per common share throughout 2026, this dividend level would result in an annualized net cash used by financing activities in 2026 of approximately $719 million (based on the outstanding shares as of December 31, 2025), or an anticipated increase in cash used of approximately $52 million compared to 2025. We can make no assurances regarding the amount of any future dividend payments. Shelf Registration Statement - On February 12, 2024, we filed a shelf registration statement on Form S-3 with the SEC, registering the offer and sale from time to time, of an indeterminate amount of debt securities, guarantees, common stock, preferred stock, warrants, depositary shares, purchase contracts, or units. The availability of the potential liquidity under this shelf registration statement depends on investor demand, market conditions and other factors. We make no assurances regarding when, or if, we will issue any securities under this registration statement. On November 15, 2022, we filed a second shelf registration statement on Form S-4 with the SEC, registering 7.0 million shares of our common stock that we may offer and issue from time to time in connection with future acquisitions of other businesses, assets or securities. At December 31, 2025, 5.5 million shares remained available for issuance under this registration statement. Common Stock Repurchases - We have in place a common stock repurchase plan approved by our board of directors in July 2021 that authorizes the repurchase of up to $1.5 billion of common stock. During the years ended December 31, 2025 and 2024, we did not repurchase shares of our common stock. The plan authorizes the repurchase of our common stock at such times and prices, as we may deem advantageous, in transactions on the open market or in privately negotiated transactions. We are under no commitment or obligation to repurchase any particular number of shares, and the plan may be suspended at any time at our discretion. Management may consider repurchasing common stock during 2026 to the extent that our available cash exceeds acquisition opportunities. Funding for share repurchases may come from a variety of sources, including cash from operations, short-term or long-term borrowings under our Credit Agreement or other sources. Public Offering of Common Stock - On December 9, 2024, we entered into an Underwriting Agreement with Morgan Stanley & Co. LLC and BofA Securities, Inc., as representatives of the several underwriters listed thereto, pursuant to which we agreed to sell 30.4 million shares of our common stock for a public per share offering price of $280.00, for an aggregate price purchase price of $8.5 billion. The offering closed on December 11, 2024 and 30.4 million shares of our common stock were issued for net proceeds, after underwriting discounts, of $8.3 billion. We also granted the underwriters a 30-day option to purchase up to an additional 4.6 million shares of our common stock at the same price, which was 61

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exercised in full by the underwriters on January 6, 2025. The option closed on January 7, 2025 and 4.6 million shares of our common stock were issued for net proceeds, after underwriting discounts, of $1.3 billion of cash. We used the proceeds of this offering to fund a portion of the cash consideration payable in connection with the AssuredPartners transaction and for other general corporate purposes including other acquisitions. At-the-Market Equity Program - On March 14, 2024, we entered into an Equity Distribution Agreement with Morgan Stanley & Co. LLC, pursuant to which we may offer and sell, from time to time, up to 3.0 million shares of our common stock through Morgan Stanley as sales agent. We intend to use the net proceeds of sales under this program to fund future acquisitions from time to time or for general corporate purposes. Pursuant to the agreement, shares may be sold by means of ordinary brokers' transactions, including on the New York Stock Exchange, at market prices prevailing at the time of sale, at prices related to the prevailing market prices, or at negotiated prices, in block transactions, or as otherwise agreed upon by us and Morgan Stanley. During the quarter ended December 31, 2025, we did not sell shares of our common stock under the program. Common Stock Issuances - Another source of liquidity to us is the issuance of our common stock pursuant to our stock option and employee stock purchase plans. Proceeds from the issuance of common stock under these plans were $192 million and $163 million in 2025 and 2024, respectively. On May 10, 2022, our stockholders approved the 2022 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved 2017 LTIP. All of our officers, employees and non-employee directors are eligible to receive awards under the LTIP. Awards which may be granted under the LTIP include non-qualified and incentive stock options, stock appreciation rights, restricted stock units and performance units, any or all of which may be made contingent upon the achievement of performance criteria. Stock options with respect to 10.2 million shares (less any shares of restricted stock issued under the LTIP - 2.1 million shares of our common stock were available for this purpose as of December 31, 2025) were available for grant under the LTIP at December 31, 2025. Our employee stock purchase plan allows our employees to purchase our common stock at 95% of its fair market value. Proceeds from the issuance of our common stock related to these plans have contributed favorably to net cash provided by financing activities in the years ended December 31, 2025 and 2024, and we believe this favorable trend will continue in the foreseeable future. We have a qualified contributory savings and thrift 401(k) plan covering the majority of our domestic employees. For eligible employees who have met the plan's age and service requirements to receive matching contributions, we historically have matched 100% of pre-tax and Roth elective deferrals up to a maximum of 5% of eligible compensation, subject to federal limits on plan contributions and not in excess of the maximum amount deductible for federal income tax purposes. Beginning with the match paid in 2021, the amount matched by the Company will be discretionary and annually determined by management. Employees must be employed and eligible for the plan on the last day of the plan year to receive a matching contribution, subject to certain exceptions enumerated in the plan document. Matching contributions are subject to a five-year graduated vesting schedule and can be funded in cash or common stock of the Company. We expensed (net of plan forfeitures) $115 million and $105 million related to the plan in 2025 and 2024, respectively. During 2024, management determined the 5% employer matching contributions on eligible compensation to the 401(k) plan for the 2024 plan year to be funded with our common stock, which was funded in February 2025. During 2025, management determined the 5% employer matching contributions on eligible compensation to the 401(k) plan for the 2025 plan year to be funded with our common stock, which is expected to be funded in February 2026 Other Liquidity Matters Letters of Credit and Other Guarantees We have entered into a number of arrangements whereby our performance on certain obligations is guaranteed by a third party through the issuance of a letter of credit. We had total letters of credit outstanding of $14 million as of December 31, 2025 and $23 million at December 31, 2024. These letters of credit secure our self-insurance deductibles on our own insurance programs, allow certain of our captive operations to meet minimum statutory surplus requirements, lease security deposits and collateral related to premium and claim funds held in a fiduciary capacity. See Note 15 to our 2025 consolidated financial statements for additional discussion of these obligations and commitments. Earnout Obligations Substantially all of the purchase agreements related to the acquisitions we do contain provisions for potential earnout obligations. For all of our acquisitions made in the period from 2022 to 2025 that contain potential earnout obligations, such obligations are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase 62

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price consideration for the respective acquisition. The amounts recorded as earnout payables are primarily based upon estimated future potential operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date. The aggregate amount of the maximum earnout obligations related to these acquisitions was $1,518 million, of which $773 million was recorded in our consolidated balance sheet as of December 31, 2025 based on the estimated fair value of the expected future payments to be made, of which approximately $535 million can be settled in cash or common stock of the Company at our option and $238 million must be settled in cash. Apart from commitments, guarantees, and contingencies, as disclosed herein and in Note 15 to our 2025 consolidated financial statements, we had no off-balance sheet arrangements that have, or are reasonably likely to have, a current or future material effect on our financial condition, results of operations or liquidity. Our cash flows from operations, borrowing availability and overall liquidity are subject to risks and uncertainties. See "Information Concerning Forward- Looking Statements" at the beginning of this report. Contractual Obligations Our contractual obligations and commitments as of December 31, 2025 are comprised of principal payments on debt, interest payments on debt, operating leases, pension benefit plan and purchase obligations. Operating leases are primarily comprised of leased office space throughout the world. As leases expire, we do not anticipate difficulty in negotiating renewals or finding other satisfactory space if the premise becomes unavailable. In certain circumstances, we may have unused space and may seek to sublet such space to third parties, depending upon the demands for office space in the locations involved. See Note 13 to our 2025 consolidated financial statements for additional discussion of these operating lease obligations. Defined benefit pension plan obligations include estimates of our minimum funding requirements pursuant to the Employee Retirement Income Security Act and other regulations. We may make additional discretionary contributions. See Note 12 to our 2025 consolidated financial statements for additional information required to be disclosed relating to our defined benefit pension plan. Purchase obligations are defined as agreements to purchase goods and services that are enforceable and legally binding on us, and that specifies all significant terms, including the goods to be purchased or services to be rendered, the price at which the goods or services are to be rendered, and the timing of the transactions. Most of our purchase obligations are related to purchases of information technology services, marketing arrangements or other service contracts. We had no other cash requirements from known contractual obligations and commitments that have, or are reasonably likely to have, a current or future material effect on the Company's financial condition, results of operations, or liquidity. See Note 15 to our 2025 consolidated financial statements for additional discussion of these contractual obligations. Outlook - We believe that we have sufficient capital and access to additional capital to meet our short- and long-term cash flow needs. Critical Accounting Estimates Our consolidated financial statements are prepared in accordance with U.S. GAAP, which require management to make estimates and assumptions that affect the amounts reported in our consolidated financial statements and accompanying notes. These accounting principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses, and the disclosure of contingent assets and liabilities at the date of our consolidated financial statements. We periodically evaluate our estimates and assumptions, including those relating to the valuation of goodwill and other intangible assets, right-of-use assets, investments, income taxes, revenue recognition, deferred costs, stock-based compensation, claims handling obligations, retirement plans, litigation and contingencies. We base our estimates on historical experience and various assumptions that we believe to be reasonable based on specific circumstances. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein. We believe the following significant accounting estimates may involve a higher degree of judgment and complexity. See Note 1 to our 2025 consolidated financial statements for other significant accounting policies. See Note 2 to our 2025 consolidated financial statements for a discussion of recently issued accounting pronouncements and their impact or potential future impact on our financial results, if determinable. 63

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Revenue Recognition Description The primary source of revenues for our brokerage services is commissions from underwriting enterprises, based on a percentage of premiums paid by our clients, or fees received from clients based on an agreed level of service usually in lieu of commissions. These commissions and fees revenues are substantially recognized at a point in time on the effective date of the associated policies when control of the policy transfers to the client, as well as deferring certain revenues to reflect delivery of services over the contract period. Whether we are paid a commission or a fee, the vast majority of our services are associated with the placement of an insurance (or insurance-like) contract. Accordingly, we recognize approximately 85% of our commission and fee revenues on the effective date of the underlying insurance contract. The amount of revenue we recognize is based on our costs to provide our services up and through that effective date, including an appropriate estimate of our profit margin on a portfolio basis. Based on the proportion of additional services we provide in each period after the effective date of the insurance contract, including an appropriate estimate of our profit margin, we recognize approximately 10% of our commission and fee revenues in the first three months, and the remaining 5% thereafter. For supplemental revenues certain underwriting enterprises may pay us additional revenues for the volume of premium placed with them and for insights into our sales pipeline, our sales capabilities or our risk selection knowledge. These amounts are in excess of the commission and fee revenues discussed above, and not all business we place with underwriting enterprises is eligible for supplemental revenues. Unlike contingent revenues, discussed below, these revenues are primarily a fixed amount or fixed percentage of premium of the underlying eligible insurance contracts. For supplemental revenue contracts based on a fixed percentage of premium, our obligation to the underwriting enterprise is substantially completed upon the effective date of the underlying insurance contract and revenue is fully earned at that time. For supplemental revenue contracts based on a fixed amount, revenue is recognized ratably over the contract period consistent with the performance of our obligations, almost always over an annual term. For contingent revenues certain underwriting enterprises may pay us additional revenues for our sales capabilities, our risk selection knowledge, or our administrative efficiencies. These amounts are in excess of the commission or fee revenues discussed above, and not all business we place with participating underwriting enterprises is eligible for contingent revenues. Unlike supplemental revenues, also discussed above, these revenues are variable, generally based on growth, the loss experience of the underlying insurance contracts, and/or our efficiency in processing the business. We generally operate under calendar year contracts, but we do not receive these revenues from the underwriting enterprises until the following calendar year, generally in the first and second quarters, after verification of the performance indicators outlined in the contracts. Accordingly, during each reporting period, we must make our best estimate of amounts we have earned using historical averages and other factors to project such revenues. See Revenue Recognition and Contracts with Customers in Notes 1 and 4 to our 2025 consolidated financial statements. Judgments and Uncertainties For commissions and fees, these periods may be different than the underlying premium payment patterns of the insurance contracts, but the vast majority of our services are fully provided within one year of the insurance contract effective date. For supplemental and contingent commissions, we base our estimates each period on a contract-by-contract basis where available. In certain cases, it is impractical to assess a very large number of smaller contingent revenue contracts, so we use a historical portfolio estimate in aggregate. Because our expectation of the ultimate contingent revenue amounts to be earned can vary from period to period, especially in contracts sensitive to loss ratios, our estimates might change significantly from quarter to quarter. For example, in circumstances where our revenues are dependent on a full calendar year loss ratio, adverse loss experience in the fourth quarter could not only negate revenue earnings in the fourth quarter, but also trigger the need to reverse revenues previously recognized during the prior quarters. Variable consideration is recognized when we conclude, based on all the facts and information available at the reporting date, that it is probable that a significant revenue reversal will not occur in future periods. Effect if Actual Results Differ From Assumptions We do not believe there is a reasonable likelihood there will be a material change in the estimates or assumptions used to recognize revenue. As noted above, estimates are made based on historical experience and other factors. The vast majority of our brokerage contracts and service understandings are for a period of one year or less, and historically, the difference between actual experience compared to estimated performance has not been significant to the quarterly or annual financial statements. We have not made any material changes in the accounting methodology used to recognize revenue during the past three fiscal years. 64

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Income Taxes Description We estimate total income tax expense based on statutory tax rates and tax planning opportunities available to us in various jurisdictions in which we earn income. Income tax includes an estimate for withholding taxes on earnings of foreign subsidiaries expected to be remitted to the U.S. but does not include an estimate for taxes on earnings considered to be indefinitely invested in the foreign subsidiary. Deferred income taxes are recognized for the future tax effects of temporary differences between financial and income tax reporting using tax rates in effect for the years in which the differences are expected to reverse. Valuation allowances are recorded when it is likely a tax benefit will not be realized for a deferred tax asset. We record unrecognized tax benefit liabilities for known or anticipated tax issues based on our analysis of whether, and the extent to which, additional taxes will be due. See Income Taxes in Notes 1 and 16 to our 2025 consolidated financial statements. Judgments and Uncertainties Changes in projected future earnings could affect the recorded valuation allowances in the future. Our calculations related to income taxes contain uncertainties due to judgment used to calculate tax liabilities in the application of complex tax regulations across the tax jurisdictions where we operate. Our analysis of unrecognized tax benefits contains uncertainties based on judgment used to apply the more likely than not recognition and measurement thresholds. Effect if Actual Results Differ From Assumptions Changes in tax laws and rates could affect recorded deferred tax assets and liabilities in the future. Other than those potential impacts, we do not believe there is a reasonable likelihood there will be a material change in the tax related balances or valuation allowances. However, due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the current estimate of the tax liabilities. To the extent we prevail in matters for which unrecognized tax benefit liabilities have been established, or are required to pay amounts in excess of our recorded unrecognized tax benefit liabilities, our effective tax rate in a given financial statement period could be materially affected. An unfavorable tax settlement would require use of our cash and generally result in an increase in our effective tax rate in the period of resolution. A favorable tax settlement would generally be recognized as a reduction in our effective tax rate in the period of resolution. Impairment of Goodwill Description Goodwill is evaluated for impairment by first performing a qualitative assessment to determine whether a quantitative goodwill test is necessary. If it is determined, based on qualitative factors, the fair value of the reporting unit may be more likely than not less than its carrying amount or if significant changes to macro-economic factors related to the reporting unit have occurred that could materially impact fair value, a quantitative goodwill impairment test would be required. The quantitative test compares the fair value of a reporting unit with its carrying amount. Additionally, we can elect to forgo the qualitative assessment and perform the quantitative test. Upon performing the quantitative test, if the carrying value of the reporting unit exceeds its fair value, an impairment loss is recognized in an amount equal to that excess, not to exceed the carrying amount of goodwill. We have elected to make the first day of the fourth quarter the annual impairment assessment date for goodwill. However, we could be required to evaluate the recoverability of goodwill outside of the required annual assessment if, among other things, we experience disruptions to the business, unexpected significant declines in operating results, divestiture of a significant component of the business or a sustained decline in market capitalization. Judgments and Uncertainties We estimate the fair value of our reporting units considering the use of various valuation techniques, with the primary technique being an income approach (discounted cash flow method) and another technique being a market approach (guideline public company method), which use significant unobservable inputs, or Level 3 inputs, as defined by the fair value hierarchy. We include assumptions about revenue growth, operating margins, discount rates and valuation multiples which consider our budgets, business plans, economic projections and marketplace data, and are believed to reflect market participant views which would exist in an exit transaction. Assumptions are also made for varying perpetual growth rates for periods beyond the long-term business plan period. Generally, we utilize operating margin assumptions based on future expectations, operating margins historically realized in the reporting units' industries and industry marketplace valuation multiples. See Intangible Assets in Notes 1 and 6 to our 2025 consolidated financial statements. 65

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Our impairment analysis contains uncertainties due to uncontrollable events that could positively or negatively impact the anticipated future economic and operating conditions. Effect if Actual Results Differ From Assumptions We have not made material changes in the accounting methodology used to evaluate impairment of goodwill during the last three years. During fiscal 2025, 2024 and 2023, all of our material reporting units passed the impairment analysis. Some of the inherent estimates and assumptions used in determining fair value of the reporting units and indefinite life intangible assets are outside the control of management, including interest rates, cost of capital, tax rates, market EBITDAC comparables and credit ratings. While we believe we have made reasonable estimates and assumptions to calculate the fair value of the reporting units and indefinite life intangibles, it is possible a material change could occur. If our actual results are not consistent with our estimates and assumptions used to calculate fair value, it could result in material impairments of our goodwill. Impairment of Amortizable Intangible Assets Description Amortizable intangible assets are evaluated for impairment whenever events or changes in circumstances indicate the carrying value may not be recoverable. Examples include a significant adverse change in the extent or manner in which we use the asset, a change in its physical condition, or an unexpected change in financial performance. When evaluating amortizable intangible assets for impairment, we compare the carrying value of the asset to the asset's estimated undiscounted future cash flows. An impairment is indicated if the estimated future cash flows are less than the carrying value of the asset. The impairment is the excess of the carrying value over the fair value of the asset. We recorded impairment charges related to amortizable intangible assets of $66 million, $19 million and $4 million in 2025, 2024 and 2023, respectively. See Intangible Assets in Notes 1 and 6 to our 2025 consolidated financial statements. Judgments and Uncertainties Our impairment analysis contains uncertainties due to judgment in assumptions, including useful lives and intended use of assets, observable market valuations, forecasted revenue growth, operating margins and discount rates based on budgets, business plans, economic projections, anticipated future cash flows and marketplace data that reflects the risk inherent in future cash flows to determine fair value. Effect if Actual Results Differ From Assumptions We have not made any material changes in the accounting methodology used to evaluate the impairment of amortizable intangible assets during the last three fiscal years. We do not believe there is a reasonable likelihood there will be a material change in the estimates or assumptions used to calculate impairments or useful lives of amortizable intangible assets. However, if actual results are not consistent with our estimates and assumptions used to calculate estimated future cash flows, we may be exposed to impairment losses that could be material. Earnout Obligations Description Substantially all of the purchase agreements related to the acquisitions we do contain provisions for potential earnout obligations. The amounts recorded as earnout payables, which are primarily based upon the terms of the purchase agreements and the estimated future operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date, are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration. We will record subsequent changes in these estimated earnout obligations, including the accretion of discount, in our consolidated statement of earnings when incurred. Judgments and Uncertainties The fair value of these earnout obligations is based on the present value of the expected future payments to be made to the sellers of the acquired entities in accordance with the provisions outlined in the respective purchase agreements, which is a Level 3 fair value measurement. In determining fair value, we estimate the acquired entity's future performance using financial projections developed by management for the acquired entity and market participant assumptions that were derived for revenue growth and/or profitability. Revenue growth rates generally ranged from 5% to 18% for our 2025 acquisitions. We estimated future payments using the earnout formula and performance targets specified in each purchase agreement and the financial projections just described. We then discounted these payments to present value using a risk- 66

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adjusted rate that takes into consideration market based rates of return that reflect the ability of the acquired entity to achieve the targets. The discount rates generally ranged from 8% to 9% for our 2025 acquisitions. Effect if Actual Results Differ From Assumptions While management believes those expectations and assumptions are reasonable, they are inherently uncertain. Changes in financial projections, market participant assumptions for revenue growth and/or profitability, or the risk-adjusted discount rate, would result in a change in the fair value of recorded earnout obligations. See Note 3 to our 2025 consolidated financial statements for additional discussion on our 2025 business combinations. Business Combinations Description We account for acquired businesses using the acquisition method of accounting, which requires that once control of a business is obtained, 100% of the assets acquired and liabilities assumed, including amounts attributed to noncontrolling interests, be recorded at the date of acquisition at their respective fair values. Any excess of the purchase price over the estimated fair values of the net assets acquired is recorded as goodwill. We use various models to determine the value of assets acquired and liabilities assumed such as discounted cash flow to value amortizable intangible assets. For significant acquisitions we may use independent third-party valuation specialists to assist us in determining the fair value of assets acquired and liabilities assumed. See Note 3 to our 2025 consolidated financial statements for additional discussion on our 2025 business combinations. Judgments and Uncertainties Significant judgment is often required in estimating the fair value of assets acquired and liabilities assumed, particularly intangible assets. We make estimates and assumptions about projected future cash flows including sales growth, operating margins, attrition rates, and discount rates based on historical results, business plans, expected synergies, perceived risk and marketplace data considering the perspective of marketplace participants. Determining the useful life of an intangible asset also requires judgment as different types of intangible assets will have different useful lives. Effect if Actual Results Differ From Assumptions While management believes those expectations and assumptions are reasonable, they are inherently uncertain. Unanticipated market or macroeconomic events and circumstances may occur, which could affect the accuracy or validity of the estimates and assumptions, which could result in subsequent impairments. Item 7A. Quantitative and Qualitative Disclosures about Market Risk. We are exposed to various market risks in our day to day operations. Market risk is the potential loss arising from adverse changes in market rates and prices, such as interest and foreign currency exchange rates and equity prices. The following analyses present the hypothetical loss in fair value of the financial instruments held by us at December 31, 2025 that are sensitive to changes in interest rates. The range of changes in interest rates used in the analyses reflects our view of changes that are reasonably possible over a one-year period. This discussion of market risks related to our consolidated balance sheet includes estimates of future economic environments caused by changes in market risks. The effect of actual changes in these market risk factors may differ materially from our estimates. In the ordinary course of business, we also face risks that are either nonfinancial or unquantifiable, including credit risk and legal risk. These risks are not included in the following analyses. Our invested assets are primarily held as cash and cash equivalents, which are subject to various market risk exposures such as interest rate risk. The fair value of our portfolio of cash and cash equivalents as of December 31, 2025 approximated its carrying value due to its short-term duration. We estimated market risk as the potential decrease in fair value resulting from a hypothetical one-percentage point increase in interest rates for the instruments contained in the cash and cash equivalents investment portfolio. The resulting fair values were not materially different from their carrying values at December 31, 2025. As of December 31, 2025, we had $12,873 million of borrowings outstanding under our various senior notes and note purchase agreements. The aggregate estimated fair value of these borrowings at December 31, 2025 was $12,183 million 67

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due to the long-term duration and fixed interest rates associated with these debt obligations. No active or observable market exists for our private placement long-term debt. Therefore, the estimated fair value of this debt is based on the income valuation approach, which is a valuation technique that converts future amounts (for example, cash flows or income and expenses) to a single current (that is, discounted) amount. The fair value measurement is determined on the basis of the value indicated by current market expectations about those future amounts. Because our debt issuances generate a measurable income stream for each lender, the income approach was deemed to be an appropriate methodology for valuing the private placement long-term debt. The methodology used calculated the original deal spread at the time of each debt issuance, which was equal to the difference between the yield of each issuance (the coupon rate) and the equivalent benchmark treasury yield at that time. The market spread as of the valuation date was calculated, which is equal to the difference between an index for investment grade insurers and the equivalent benchmark treasury yield today. An implied premium or discount to the par value of each debt issuance based on the difference between the origination deal spread and market as of the valuation date was then calculated. The index we relied on to represent investment graded insurers was the Bloomberg Valuation Services (BVAL) U.S. Insurers BBB index. This index is comprised primarily of insurance brokerage firms and was representative of the industry in which we operate. For the purpose of our analysis, the average BBB rate was assumed to be the appropriate borrowing rate for us. We estimated market risk as the potential impact on the value of the debt recorded in our consolidated balance sheet based on a hypothetical one-percentage point change in our weighted average borrowing rate as of December 31, 2025. A one- percentage point decrease would result in an estimated fair value of $13,177 million, or $304 million more than their current carrying value. A one-percentage point increase would result in an estimated fair value of $11,332 million, or $1,541 million less than their current carrying value. As of December 31, 2025, there were no borrowings outstanding under our Credit Agreement and $226 million of borrowings outstanding under our Premium Financing Debt Facility. The fair value of these borrowings approximate their carrying value due to their short-term duration and variable interest rates associated with these debt obligations. Market risk is estimated as the potential increase in fair value resulting from a hypothetical one-percentage point decrease in our weighted average short-term borrowing rate at December 31, 2025 and the resulting fair values are not materially different from their carrying value. We are subject to foreign currency exchange rate risk primarily from one of our larger U.K. based brokerage subsidiaries that incurs expenses denominated primarily in British pounds while receiving a substantial portion of its revenues in U.S. dollars. In addition, we are subject to foreign currency exchange rate risk from our Australian, Canadian, Indian, Jamaican, New Zealand, Norwegian, Singaporean and various Caribbean and Latin American operations because we transact business in their local denominated currencies. Foreign currency gains (losses) related to this market risk are recorded in earnings before income taxes as transactions occur. Assuming a hypothetical adverse change of 10% in the average foreign currency exchange rate for 2025 (a weakening of the U.S. dollar), earnings before income taxes would have increased by approximately $71 million. Assuming a hypothetical favorable change of 10% in the average foreign currency exchange rate for 2025 (a strengthening of the U.S. dollar), earnings before income taxes would have decreased by approximately $56 million. We are also subject to foreign currency exchange rate risk associated with the translation of local currencies of our foreign subsidiaries into U.S. dollars. We manage the balance sheets of our foreign subsidiaries, where practical, such that foreign liabilities are matched with equal foreign assets, maintaining a "balanced book" which minimizes the effects of currency fluctuations. However, our consolidated financial position is exposed to foreign currency exchange risk related to intra-entity loans between our U.S. based subsidiaries and our non-U.S. based subsidiaries that are denominated in the respective local foreign currency. A transaction that is in a foreign currency is first remeasured at the entity's functional (local) currency, where applicable, (which is an adjustment to consolidated earnings) and then translated to the reporting (U.S. dollar) currency (which is an adjustment to consolidated stockholders' equity) for consolidated reporting purposes. If the transaction is already denominated in the foreign entity's functional currency, only the translation to U.S. dollar reporting is necessary. The remeasurement process required by U.S. GAAP for such foreign currency loan transactions will give rise to a consolidated unrealized foreign exchange gain or loss, which could be material, that is recorded in accumulated other comprehensive loss. Historically, we have not entered into derivatives or other similar financial instruments for trading or speculative purposes. However, with respect to managing foreign currency exchange rate risk in India, Norway and the U.K., we have periodically purchased financial instruments to minimize our exposure to this risk. During 2025, 2024 and 2023, we had several monthly put/call options in place with an external financial institution that were designed to hedge a significant portion of our future India, Norway and the U.K. currency revenues through various future payment dates. In addition, during 2025, 2024 and 2023, we had several monthly put/call options in place with an external financial institution that were designed to hedge a significant portion of our Indian currency disbursements through various future payment dates. 68

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Although these hedging strategies were designed to protect us against significant India, Norway and the U.K. currency exchange rate movements, we are still exposed to some foreign currency exchange rate risk for the portion of the payments and currency exchange rate that are unhedged. All of these hedges are accounted for in accordance with ASC Topic 815, "Derivatives and Hedging", and periodically are tested for effectiveness in accordance with such guidance. In the scenario where such hedge does not pass the effectiveness test, the hedge will be re-measured at the stated point and the appropriate loss, if applicable, would be recognized. For the year ended December 31, 2025 there has been no such effect on our consolidated financial presentation. The impact of these hedging strategies was not material to our consolidated financial statements for 2025, 2024 and 2023. See Note 18 to our 2025 consolidated financial statements for the changes in fair value of these derivative instruments reflected in comprehensive earnings in 2025, 2024 and 2023. 69

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Item 8. Financial Statements and Supplementary Data. Arthur J. Gallagher & Co. Consolidated Statement of Earnings (In millions, except per share data) Year Ended December 31, 2025 2024 2023 Commissions $8,024 $6,694 $5,865 Fees 4,195 3,607 3,145 Supplemental revenues 466 359 314 Contingent revenues 324 268 235 Interest income, premium finance revenues and other income 769 473 368 Revenues before reimbursements 13,778 11,401 9,927 Reimbursements 164 154 145 Total revenues 13,942 11,555 10,072 Compensation 7,842 6,522 5,681 Operating 2,258 1,754 1,689 Reimbursements 164 154 145 Interest 639 381 297 Depreciation 206 178 165 Amortization 916 665 532 Change in estimated acquisition earnout payables 46 26 378 Total expenses 12,071 9,680 8,887 Earnings before income taxes 1,871 1,875 1,185 Provision for income taxes 368 404 219 Net earnings 1,503 1,471 966 Net earnings (loss) attributable to noncontrolling interests 9 8 (4) Net earnings attributable to controlling interests $1,494 $1,463 $970 Basic net earnings per share $5.83 $6.63 $4.51 Diluted net earnings per share 5.74 6.50 4.42 Dividends declared per common share 2.60 2.40 2.20 See notes to consolidated financial statements. 70

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Arthur J. Gallagher & Co. Consolidated Statement of Comprehensive Earnings (In millions) Year Ended December 31, 2025 2024 2023 Net earnings $1,503 $1,471 $966 Change in pension liability, net of taxes — 14 12 Foreign currency translation, net of taxes 630 (365) 258 Change in fair value of derivative instruments, net of taxes (4) (8) 78 Comprehensive earnings 2,129 1,112 1,314 Comprehensive earnings (loss) attributable to noncontrolling interests 9 8 (3) Comprehensive earnings attributable to controlling interests $2,120 $1,104 $1,317 See notes to consolidated financial statements. 71

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Arthur J. Gallagher & Co. Consolidated Balance Sheet (In millions) December 31, 2025 2024 Cash and cash equivalents $1,396 $14,987 Fiduciary assets (includes fiduciary cash of $7,142 in 2025 and $5,481 in 2024) 26,899 24,712 Accounts receivable, net 5,175 3,896 Other current assets 886 518 Total current assets 34,356 44,113 Fixed assets - net 789 650 Deferred income taxes (includes tax credit carryforwards of $772 in 2024) 43 959 Other noncurrent assets 1,602 1,355 Right-of-use assets 598 378 Goodwill - net 22,593 12,270 Amortizable intangible assets - net 10,684 4,530 Total assets $70,665 $64,255 Fiduciary liabilities $26,899 $24,712 Accrued compensation and other current liabilities 4,017 3,586 Deferred revenue - current 737 537 Premium financing debt 226 225 Corporate related borrowings - current 640 200 Total current liabilities 32,519 29,260 Corporate related borrowings - noncurrent 12,104 12,732 Deferred revenue - noncurrent 155 67 Lease liabilities - noncurrent 515 328 Other noncurrent liabilities (includes tax credit carryforwards of $713 in 2025) 2,025 1,688 Total liabilities 47,318 44,075 Stockholders' equity: Common stock - authorized 400 shares; issued and outstanding 257 shares in 2025 and 250 shares in 2024 257 250 Capital in excess of par value 17,783 16,069 Retained earnings 5,806 4,986 Accumulated other comprehensive loss (525) (1,151) Stockholders' equity attributable to controlling interests 23,321 20,154 Stockholders' equity attributable to noncontrolling interests 26 26 Total stockholders' equity 23,347 20,180 Total liabilities and stockholders' equity $70,665 $64,255 See notes to consolidated financial statements. 72

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Arthur J. Gallagher & Co. Consolidated Statement of Cash Flows (In millions) Year Ended December 31, 2025 2024 2023 Cash flows from operating activities: Net earnings $1,503 $1,471 $966 Adjustments to reconcile net earnings to net cash provided by operating activities: Net gain on investments and other (23) (23) (8) Depreciation and amortization 1,122 843 697 Change in estimated acquisition earnout payables 46 26 378 Amortization of deferred compensation and restricted stock 148 117 105 Stock-based and other noncash compensation expense 49 42 31 Payments on acquisition earnouts in excess of original estimates (491) (43) (68) Provision for deferred income taxes 61 109 43 Effect of changes in foreign exchange rates 54 — 10 Net change in accounts receivable, net (278) (65) (504) Net change in deferred revenue (56) (116) 49 Net change in other current assets (218) (114) (107) Net change in accrued compensation and other accrued liabilities 112 363 463 Net change in income taxes payable (60) (42) (78) Net change in other noncurrent assets and liabilities (39) 15 55 Net cash provided by operating activities 1,930 2,583 2,032 Cash flows from investing activities: Capital expenditures (145) (142) (194) Cash paid for acquisitions, net of cash and restricted cash acquired (15,766) (1,462) (3,042) Net proceeds from sales of operations/books of business 17 20 10 Net funding of investment transactions 2 6 6 Net funding of premium finance loans 16 (9) (73) Net cash used by investing activities (15,876) (1,587) (3,293) Cash flows from financing activities: Payments on acquisition earnouts (442) (143) (98) Proceeds from issuance of common stock 1,499 8,507 120 Payments to noncontrolling interests (5) (4) (2) Dividends paid (667) (525) (474) Net change in fiduciary assets and liabilities 1,531 (1) 1,297 Net borrowings on premium financing debt facility (15) (41) 42 Borrowings on line of credit facility 2,546 1,663 3,795 Repayments on line of credit facility (2,546) (1,907) (3,610) Net borrowings of corporate related long-term debt (197) 5,552 1,634 Debt acquisition costs 9 (52) (18) Settlements on terminated interest rate swaps — 3 188 Net cash provided by financing activities 1,713 13,052 2,874 Effect of changes in foreign exchange rates on cash, cash equivalents, restricted cash and fiduciary cash 303 (123) (34) Net (decrease) increase in cash, cash equivalents, restricted cash and fiduciary cash (11,930) 13,925 1,579 Cash, cash equivalents, restricted cash and fiduciary cash at beginning of year 20,468 6,543 4,964 Cash, cash equivalents, restricted cash and fiduciary cash at end of year $8,538 $20,468 $6,543 See notes to consolidated financial statements. 73

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Arthur J. Gallagher & Co. Consolidated Statement of Stockholders' Equity (In millions) Common Stock Capital in Excess of Par Value Retained Earnings Accumulated Other Comprehensive Loss Noncontrolling Interests TotalShares Amount Balance at December 31, 2022 211.9 $211.9 $6,510 $3,562 $(1,140) $46 $9,190 Net earnings — — — 970 — (4) 966 Net purchase of subsidiary shares from noncontrolling interests — — — — — (3) (3) Dividends paid to noncontrolling interests — — — — — (1) (1) Net change in pension asset/liability, net of taxes of $3 million — — — — 12 — 12 Foreign currency translation — — — — 258 1 259 Change in fair value of derivative instruments, net of taxes of $27 million — — — — 78 — 78 Compensation expense related to stock option plan grants — — 34 — — — 34 Common stock issued in: — Twenty-three purchase transactions 2.5 2.5 523 — — — 526 Stock option plans 1.2 1.2 64 — — — 65 Employee stock purchase plan 0.3 0.3 55 — — — 55 Shares issued to benefit plans 0.4 0.4 84 — — — 84 Deferred compensation and restricted stock 0.4 0.4 28 — — — 28 Cash dividends declared on common stock — — — (479) — — (479) Balance at December 31, 2023 216.7 216.7 7,298 4,053 (792) 39 10,815 Net earnings — — — 1,463 — 8 1,471 Net purchase of subsidiary shares from noncontrolling interests — — — — — (18) (18) Dividends paid to noncontrolling interests — — — — — (3) (3) Net change in pension asset/liability, net of taxes of $3 million — — — — 14 — 14 Foreign currency translation — — — — (365) — (365) Change in fair value of derivative instruments, net of taxes of $(3) million — — — — (8) — (8) Compensation expense related to stock option plan grants — — 48 — — — 48 Common stock issued in: Thirteen purchase transactions 0.6 0.6 140 — — — 141 Stock option plans 1.3 1.3 91 — — — 92 Employee stock purchase plan 0.3 0.3 70 — — — 70 Shares issued to benefit plans 0.4 0.4 98 — — — 98 Deferred compensation and restricted stock 0.3 0.3 10 — — — 10 Stock issuance from public offering 30.4 30.4 8,314 — — — 8,344 Cash dividends declared on common stock — — — (530) — — (530) Balance at December 31, 2024 250.0 $250.0 $16,069 $4,986 $(1,151) $26 $20,180 See notes to consolidated financial statements. 74

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Arthur J. Gallagher & Co. Consolidated Statement of Stockholders' Equity (continued) (In millions) Common Stock Capital in Excess of Par Value Retained Earnings Accumulated Other Comprehensive Loss Noncontrolling Interests TotalShares Amount Balance at December 31, 2024 250.0 $250.0 $16,069 $4,986 $(1,151) $26 $20,180 Net earnings — — — 1,494 — 9 1,503 Net purchase of subsidiary shares from noncontrolling interests — — — — — (2) (2) Dividends paid to noncontrolling interests — — — — — (7) (7) Foreign currency translation — — — — 630 — 630 Change in fair value of derivative instruments, net of taxes of $1 million — — — — (4) — (4) Compensation expense related to stock option plan grants — — 54 — — — 54 Common stock issued in: Five purchase transactions 0.1 0.1 30 — — — 30 Stock option plans 1.2 1.2 111 — — — 112 Employee stock purchase plan 0.3 0.3 80 — — — 80 Shares issued to benefit plans 0.3 0.3 119 — — — 119 Deferred compensation and restricted stock 0.5 0.5 72 — — — 73 Stock issuance from public offering 4.6 4.6 1,248 — — — 1,253 Cash dividends declared on common stock — — — (674) — — (674) Balance at December 31, 2025 257.0 $257.0 $17,783 $5,806 $(525) $26 $23,347 See notes to consolidated financial statements. 75

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Arthur J. Gallagher & Co. Notes to Consolidated Financial Statements December 31, 2025 1. Summary of Significant Accounting Policies Terms Used in Notes to Consolidated Financial Statements ASC - Accounting Standards Codification. ASU - Accounting Standards Update. FASB - The Financial Accounting Standards Board. GAAP - United States (U.S.) generally accepted accounting principles. IRC - Internal Revenue Code. IRS - Internal Revenue Service. Topic 606 - ASU No. 2014-09, Revenue from Contracts with Customers. Underwriting enterprises - Insurance companies, reinsurance companies and various other forms of risk- taking entities, including intermediaries of underwriting enterprises. Nature of Operations Arthur J. Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our, us or the Company, provide insurance brokerage, consulting and third party claims settlement and administration services to both domestic and international entities. We have three reportable segments: brokerage, risk management and corporate. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients. Our brokerage segment operations provide brokerage and consulting services to entities of all types, including commercial, nonprofit, public sector entities and to a lesser extent, individuals, in the areas of insurance and reinsurance placements, risk of loss management and management of employer sponsored benefit programs. Our risk management segment operations provide contract claim settlement, claim administration, loss control services and risk management consulting for commercial, nonprofit, captive and public sector entities, and various other organizations that choose to self-insure property/casualty coverages or choose to use a third-party claims management organization rather than the claim services provided by underwriting enterprises. The corporate segment reports the financial information related to our debt, external acquisition-related expenses, other corporate costs, the impact of foreign currency translation and clean energy investments. We do not assume underwriting risk on a net basis, other than with respect to de minimis amounts necessary to provide minimum or regulatory capital insurance to organize captives, pools, specialized underwriters or risk-retention groups. Rather, capital necessary for covering losses is provided by underwriting enterprises. Investment income and other revenues are primarily generated from our premium financing operations, our invested cash and restricted cash we hold on behalf of our clients, as well as clean energy investments. In addition, our share of the net earnings related to partially owned entities that are accounted for using the equity method is included in investment income. Arthur J. Gallagher & Co., a global insurance brokerage, risk management and consulting services firm, is headquartered in Rolling Meadows, Illinois. The Company provides these services in approximately 130 countries around the world through its owned operations and a network of correspondent brokers and consultants. 76

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Basis of Presentation The accompanying consolidated financial statements include our accounts and all of our majority-owned subsidiaries (50% or greater ownership). Substantially all of our investments in partially owned entities in which our ownership is less than 50% are accounted for using the equity method based on the legal form of our ownership interest and the applicable ownership percentage of the entity. However, in situations where a less than 50%-owned investment has been determined to be a variable interest entity and we are deemed to be the primary beneficiary in accordance with the variable interest model of consolidation, we will consolidate the investment into our consolidated financial statements. For partially owned entities accounted for using the equity method, our share of the net earnings of these entities is included in consolidated net earnings. All material intercompany accounts and transactions have been eliminated in consolidation. In the preparation of our consolidated financial statements as of December 31, 2025, management evaluated all material subsequent events or transactions that occurred after the balance sheet date through the date on which the financial statements were issued for potential recognition and/or disclosure in the notes therein. Use of Estimates The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These accounting principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses, and the disclosure of contingent assets and liabilities at the date of our consolidated financial statements. We periodically evaluate our estimates and assumptions, including those relating to the valuation of goodwill and other intangible assets, right-of-use assets, investments, income taxes, revenue recognition, deferred costs, stock-based compensation, claims handling obligations, retirement plans, litigation and contingencies. We base our estimates on historical experience and various assumptions that we believe to be reasonable based on specific circumstances. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein. Revenue Recognition Our revenues are derived from commissions and fees as primarily specified in a written contract, or unwritten business understanding, with our clients or underwriting enterprises. We also recognize investment income over time from our invested assets and invested assets we hold on behalf of our clients or underwriting enterprises. BROKERAGE SEGMENT Our brokerage segment generates revenues by: • Identifying, negotiating and placing all forms of insurance (or insurance-like) coverage, as well as providing data analytics, risk-shifting, risk-sharing and risk-mitigation consulting services, principally related to property/casualty, life, health, welfare and disability insurance. We also provide these services through, or in conjunction with, other unrelated agents and brokers, consultants and management advisors; • Identifying, negotiating and placing all forms of reinsurance coverage, as well as providing capital markets services, including acting as underwriter, with respect to insurance linked securities, weather derivatives, capital raising and selected merger and acquisition advisory activities; • Acting as an agent or broker for multiple underwriting enterprises by providing services such as sales, marketing, selecting, negotiating, underwriting, servicing and placing insurance coverage on their behalf; • Providing consulting services related to health and welfare benefits, voluntary benefits, executive benefits, compensation, retirement planning, institutional investment and fiduciary, actuarial, compliance, private insurance exchange, human resource technology, communications and benefits administration; and • Providing management and administrative services to captives, pools, risk-retention groups, healthcare exchanges, small underwriting enterprises, such as accounting, claims and loss 77

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processing assistance, feasibility studies, actuarial studies, data analytics and other administrative services. The vast majority of our brokerage contracts and service understandings are for a period of one year or less. Commissions and fees The primary source of revenues for our brokerage services is commissions from underwriting enterprises, based on a percentage of premiums paid by our clients, or fees received from clients based on an agreed level of service usually in lieu of commissions. These commissions and fees revenues are substantially recognized at a point in time on the effective date of the associated policies when control of the policy transfers to the client, as well as deferring certain revenues to reflect delivery of services over the contract period. Commissions are fixed at the contract effective date and generally are based on a percentage of premiums for insurance coverage or employee headcount for employer sponsored benefit plans. Commissions depend upon a large number of factors, including the type of risk being placed, the particular underwriting enterprise's demand, the expected loss experience of the particular risk of coverage, and historical benchmarks surrounding the level of effort necessary for us to place and service the insurance contract. Rather than being tied to the amount of premiums, fees are most often based on an expected level of effort to provide our services. Whether we are paid a commission or a fee, the vast majority of our services are associated with the placement of an insurance (or insurance-like) contract. Accordingly, we recognize approximately 85% of our commission and fee revenues on the effective date of the underlying insurance contract. The amount of revenue we recognize is based on our costs to provide our services up and through that effective date, including an appropriate estimate of our profit margin on a portfolio basis (a practical expedient as defined in Topic 606). Based on the proportion of additional services we provide in each period after the effective date of the insurance contract, including an appropriate estimate of our profit margin, we recognize approximately 10% of our commission and fee revenues in the first three months, and the remaining 5% thereafter. These periods may be different than the underlying premium payment patterns of the insurance contracts, but the vast majority of our services are fully provided within one year of the insurance contract effective date. For consulting and advisory services, we recognize our revenue in the period in which we provide the service or advice. For management and administrative services, our revenue is recognized ratably over the contract period consistent with the performance of our obligations, mostly over an annual term. Supplemental revenues Certain underwriting enterprises may pay us additional revenues for the volume of premium placed with them and for insights into our sales pipeline, our sales capabilities or our risk selection knowledge. These amounts are in excess of the commission and fee revenues discussed above, and not all business we place with underwriting enterprises is eligible for supplemental revenues. Unlike contingent revenues, discussed below, these revenues are primarily a fixed amount or fixed percentage of premium of the underlying eligible insurance contracts. For supplemental revenue contracts based on a fixed percentage of premium, our obligation to the underwriting enterprise is substantially completed upon the effective date of the underlying insurance contract and revenue is fully earned at that time. For supplemental revenue contracts based on a fixed amount, revenue is recognized ratably over the contract period consistent with the performance of our obligations, almost always over an annual term. We receive these revenues on a quarterly or annual basis. Contingent revenues Certain underwriting enterprises may pay us additional revenues for our sales capabilities, our risk selection knowledge, or our administrative efficiencies. These amounts are in excess of the commission or fee revenues discussed above, and not all business we place with participating underwriting enterprises is eligible for contingent revenues. Unlike supplemental revenues, also discussed above, these revenues are variable, generally based on growth, the loss experience of the underlying insurance contracts, and/or our efficiency in processing the business. We generally operate under calendar year contracts, but we do not receive these revenues from the underwriting enterprises until the following calendar year, generally in the first and second quarters, after verification of the performance indicators outlined in the contracts. Accordingly, during each reporting period, we must make our best estimate of amounts we have earned using historical averages and other factors to project such revenues. We base our estimates each period on a contract-by-contract basis where available. In certain cases, it is impractical to assess a very large number of smaller contingent revenue contracts, so 78

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we use a historical portfolio estimate in aggregate (a practical expedient as defined in Topic 606). Because our expectation of the ultimate contingent revenue amounts to be earned can vary from period to period, especially in contracts sensitive to loss ratios, our estimates might change significantly from quarter to quarter. For example, in circumstances where our revenues are dependent on a full calendar year loss ratio, adverse loss experience in the fourth quarter could not only negate revenue earnings in the fourth quarter, but also trigger the need to reverse revenues previously recognized during the prior quarters. Variable consideration is recognized when we conclude, based on all the facts and information available at the reporting date, that it is probable that a significant revenue reversal will not occur in future periods. Sub-brokerage costs Sub-brokerage costs are excluded from our gross revenues in our determination of total revenues. Sub-brokerage costs represent commissions paid to sub-brokers related to the placement of certain business by our brokerage segment operations. We recognize this contra revenue in the same manner as the commission revenue to which it relates. RISK MANAGEMENT SEGMENT Revenues for our risk management segment are comprised of fees generally negotiated (i) on a per-claim or per-service basis, (ii) on a cost-plus basis, or (iii) as performance-based fees. We also provide risk management consulting services that are recognized as the services are delivered. Per-claim or per-service fees Where we operate under a contract with our fee established on a per-claim or per-service basis, our obligation is to process claims for a term specified within the contract. Because it is impractical to recognize our revenues on an individual claim- by-claim basis, we recognize revenue plus an appropriate estimate of our profit margin on a portfolio basis by grouping claims with similar characteristics (a practical expedient as defined in Topic 606). We apply actuarially-determined, historical-based patterns to determine our future service obligations, without applying a present value discount. Cost-plus fees Where we provide services and generate revenues on a cost-plus basis, we recognize revenue over the contract period consistent with the performance of our obligations. Performance-based fees Certain clients pay us additional fee revenues for our efficiency in managing claims or on the basis of claim outcome effectiveness. These amounts are in excess of the fee revenues discussed above. These revenues are variable, generally based on performance metrics set forth in the underlying contracts. We generally operate under multi-year contracts with fiscal year measurement periods. We do not receive these fees, if earned, until the following year after verification of the performance metrics outlined in the contracts. Each period we base our estimates on a contract-by-contract basis. We must make our best estimate of amounts we have earned using historical averages and other factors to project such revenues. Variable consideration is recognized when we conclude that it is probable that a significant revenue reversal will not occur in future periods. Reimbursements Reimbursements represent amounts received from clients reimbursing us for certain third-party costs associated with providing our claims management services. In certain service partner relationships, we are considered a principal because we direct the third party, control the specified service and combine the services provided into an integrated solution. Given this principal relationship, we are required to recognize revenue gross and service partner vendor fees in the operating expense in our consolidated statement of earnings. Deferred Costs We incur costs to provide brokerage and risk management services. Those costs are either (i) costs to obtain a contract or (ii) costs to fulfill such contract, or (iii) all other costs. • Costs to obtain - we incur costs to obtain a contract with a client. Those costs would not have been incurred if the contract had not been obtained. Almost all of 79

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our costs to obtain are incurred prior to, or on, the effective date of the contract and consist primarily of incentive compensation we pay to our production employees. Our costs to obtain are expensed as incurred as described in Note 4 to these consolidated financial statements. • Costs to fulfill - we incur costs to fulfill a contract (or anticipated contract) with a client. Those costs are incurred prior to the effective date of the contract and relate to fulfilling our primary placement obligations to our clients. Our costs to fulfill prior to the effective date are capitalized and amortized on the effective date. These fulfillment activities include collecting underwriting information from our client, assessing their insurance needs and negotiating their placement with one or more underwriting enterprises. The majority of costs that we incur relate to compensation and benefits of our client service employees. Costs incurred during preplacement activities are expected to be recovered in the future. If the capitalized costs are no longer deemed to be recoverable, then they would be expensed. • Other costs that are not costs to obtain or fulfill are expensed as incurred. Examples include other operating costs such as rent, utilities, management costs, overhead costs, legal and other professional fees, technology costs, insurance related costs, communication and advertising, and travel and entertainment. Depreciation, amortization and change in estimated acquisition earnout payable are expensed as incurred. Investment Income Investment income primarily includes interest (including revenue from our premium financing operations) and dividend income, which is accrued as it is earned. Net gains on divestitures represent one-time gains related to sales of brokerage related businesses, which are primarily recognized on a cash received basis. Earnings per Share Basic net earnings per share is computed by dividing net earnings by the weighted average number of common shares outstanding during the reporting period. Diluted net earnings per share is computed by dividing net earnings by the weighted average number of common and common equivalent shares outstanding during the reporting period. Common equivalent shares include incremental shares from dilutive stock options, which are calculated from the date of grant under the treasury stock method using the average market price for the period. Cash and Cash Equivalents Short-term investments, consisting principally of cash and money market accounts that have average maturities of 90 days or less, are considered cash equivalents. Fiduciary Assets and Liabilities Fiduciary assets represent cash held and insurance and reinsurance receivables that relate to our clients and are held on their behalf. Fiduciary liabilities represent the corresponding amounts that are owed to underwriting enterprises on behalf of our clients. In our capacity as an insurance broker, we collect premiums from insureds and, after deducting our commissions and/or fees, remit these premiums to underwriting enterprises. We hold unremitted insurance premiums in a fiduciary capacity until we disburse them, and the use of such funds is restricted by laws in certain states and foreign jurisdictions in which our subsidiaries operate. Various state and foreign agencies regulate insurance brokers and provide specific requirements that limit the type of investments that may be made with such funds. Accordingly, we invest these funds in cash and U.S. Treasury fund accounts. We can earn interest income on these unremitted funds, which is included in investment income in the accompanying consolidated statement of earnings. These unremitted amounts are included in fiduciary assets in the accompanying consolidated balance sheet, with the related liability included in fiduciary liabilities. Additionally, several of our foreign subsidiaries are required by various foreign agencies to meet certain liquidity and solvency requirements. We were in compliance with these requirements at December 31, 2025. This restricted cash is included in cash and cash equivalents net in the accompanying consolidated balance sheet. 80

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Related to our third party administration business and in certain of our brokerage operations, we are responsible for client claim funds that we hold in a fiduciary capacity. We do not earn any interest income on the funds held. These client funds have been included in fiduciary assets, along with a corresponding liability in fiduciary liabilities in the accompanying consolidated balance sheet. Accounts Receivable Accounts receivable, net in the accompanying consolidated balance sheet includes accrued agency billed commissions, fees, supplemental commissions, direct bill commissions and contingent commission receivables due to the Company. Accounts receivable are net of allowances for estimated policy cancellations and credit losses on trade receivables and accounts receivables. The allowance for estimated policy cancellations was $23 million and $13 million at December 31, 2025 and 2024, respectively, which represents a reserve for future reversals in commission and fee revenues related to the potential cancellation of client insurance policies that were in force as of each year end. The allowance for credit losses on trade receivables and accounts receivables was $49 million and $22 million at December 31, 2025 and 2024, respectively. We establish the allowance for estimated policy cancellations through a charge to revenues and the allowance for doubtful accounts through a charge to operating expenses. Both of these allowances are based on estimates and assumptions using historical data to project future experience. Such estimates and assumptions could change in the future as more information becomes known which could impact the amounts reported and disclosed herein. We periodically review the adequacy of these allowances and make adjustments as necessary. Derivative Instruments We are exposed to market risks, including changes in foreign currency exchange rates and interest rates. To manage the risk related to these exposures, we enter into various derivative instruments that reduce these risks by creating offsetting exposures. In the normal course of business, we are exposed to the impact of foreign currency fluctuations that impact our results of operations and cash flows. We utilize a foreign currency risk management program involving foreign currency derivatives that consist of several monthly put/call options designed to hedge a portion of our future foreign currency disbursements through various future payment dates. To mitigate the counterparty credit risk we only enter into contracts with major financial institutions based upon their credit ratings and other factors. These derivative instrument contracts are cash flow hedges that qualify for hedge accounting and primarily hedge against fluctuations between changes in the British pound and Indian Rupee versus the U.S. dollar. Changes in fair value of the derivative instruments are reflected in other comprehensive earnings in the accompanying consolidated balance sheet. The impact of the hedge at maturity is recognized in the income statement as a component of investment income, compensation and operating expenses depending on the nature of the hedged item. We enter into various long-term debt agreements. We use interest rate derivatives, typically swaps, to reduce our exposure to the effects of interest rate fluctuations on the forecasted interest rates for up to three years into the future. These derivative instrument contracts are periodically monitored for hedge ineffectiveness, the amount of which has not been material to the accompanying consolidated financial statements. We do not use derivatives for trading or speculative purposes. Premium Financing Seven subsidiaries of the brokerage segment make short-term loans (generally with terms of twelve months or less) to our clients to finance premiums. These premium financing contracts are structured to minimize potential bad debt expense to us. Such receivables are generally considered delinquent after seven days of the payment due date. In normal course, insurance policies are canceled within one month of the contractual payment due date if the payment remains delinquent. We recognize interest income as it is earned over the life of the contract using the "level-yield" method. Unearned interest related to contracts receivable is included in the receivable balance in the accompanying consolidated balance sheet. The outstanding loan receivable balance was $636 million and $616 million at December 31, 2025 and 2024, respectively. Fixed Assets We carry fixed assets at cost, less accumulated depreciation, in the accompanying consolidated balance sheet. We periodically review long-lived assets for impairment whenever events or changes in business circumstances indicate that the carrying value of the assets may not be recoverable. Under those circumstances, if the fair value were less than the carrying amount of the asset, we would recognize a loss for the difference. Depreciation for fixed assets is computed using the straight-line method over the following estimated useful lives: 81

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Useful Life Office equipment Three to ten years Furniture and fixtures Two to ten years Computer equipment Three to five years Building Fifteen to forty years Software Three to five years Leasehold improvements Shorter of the lease term or useful life of the asset Intangible Assets Intangible assets represent the excess of cost over the estimated fair value of net tangible assets of acquired businesses. Our primary intangible assets are classified as either goodwill, expiration lists, non-compete agreements or trade names. Expiration lists, non-compete agreements and trade names are amortized using the straight-line method over their estimated useful lives (two to fifteen years for expiration lists, two to six years for non-compete agreements and two to fifteen years for trade names), while goodwill is not subject to amortization. The establishment of goodwill, expiration lists, non- compete agreements and trade names and the determination of estimated useful lives are primarily based on valuations we receive from qualified independent appraisers. The calculations of these amounts are based on estimates and assumptions using historical and projected financial information and recognized valuation methods. Different estimates or assumptions could produce different results. We carry identifiable intangible assets at cost, less accumulated amortization, in the accompanying consolidated balance sheet. We review all of our intangible assets for impairment periodically (at least annually for goodwill) and whenever events or changes in business circumstances indicate that the carrying value of the assets may not be recoverable. We perform such impairment reviews at the division (i.e., reporting unit) level with respect to goodwill and at the business unit level for amortizable intangible assets. While goodwill is not amortizable, it is tested for impairment at least annually in the fourth quarter, and more frequently if there are indicators of impairment or whenever business circumstances suggest that the carrying value of goodwill may not be recoverable. We may initially perform a qualitative analysis to determine if it is more likely than not that the goodwill balance is impaired. If a qualitative assessment is not performed or if a determination is made that it is not more likely than not that the fair value of the reporting unit exceeds its carrying amount, then we will perform a quantitative analysis. The fair value of each reporting unit is compared to its carrying value. If the fair value of the reporting unit is less than its carrying value, a non-cash impairment charge is recognized for the amount by which the carrying value exceeds the reporting unit's fair value with the loss not exceeding the total amount of goodwill allocated to that reporting unit. We completed our 2025 annual assessment in the fourth quarter and concluded goodwill was not impaired, as the fair value of each reporting unit exceeded its carrying value. The carrying value of amortizable intangible assets attributable to each business or asset group is periodically reviewed by management to determine if there are events or changes in circumstances that would indicate that its carrying amount may not be recoverable. Accordingly, if there are any such changes in circumstances during the year, we assess the carrying value of the amortizable intangible assets by considering the estimated future undiscounted cash flows generated by the corresponding business or asset group. Any impairment identified through this assessment may require that the carrying value of related amortizable intangible assets be adjusted and charged against current period earnings as a component of amortization expense. Based on the results of impairment reviews in 2025, 2024 and 2023, we wrote off $66 million, $19 million and $4 million, respectively, of amortizable intangible assets primarily related to acquisitions (made prior to 2024) of our brokerage and risk management segments, which is included in amortization expense in the accompanying consolidated statement of earnings. The determinations of impairment indicators and fair value are based on estimates and assumptions related to the amount and timing of future cash flows and future interest rates. Such estimates and assumptions could change in the future as more information becomes known which could impact the amounts reported and disclosed herein. Income Taxes Our tax rate reflects the statutory tax rates applicable to our taxable earnings and tax planning in the various jurisdictions in which we operate. Significant judgment is required in determining the annual effective tax rate and in evaluating uncertain tax positions. We report a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in our tax return. We evaluate our tax positions using a two-step process. The first step involves recognition. We determine whether it is more likely than not that a tax position will be sustained upon tax examination based solely on the 82

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technical merits of the position. The technical merits of a tax position are derived from both statutory and judicial authority (legislation and statutes, legislative intent, regulations, rulings and case law) and their applicability to the facts and circumstances of the position. If a tax position does not meet the "more likely than not" recognition threshold, we do not recognize the benefit of that position in the financial statements. The second step is measurement. A tax position that meets the "more likely than not" recognition threshold is measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of benefit that has a likelihood of greater than 50% of being realized upon ultimate resolution with a taxing authority. Uncertain tax positions are measured based upon the facts and circumstances that exist at each reporting period and involve significant management judgment. Subsequent changes in judgment based upon new information may lead to changes in recognition, derecognition and measurement. Adjustments may result, for example, upon resolution of an issue with the taxing authorities, or expiration of a statute of limitations barring an assessment for an issue. We recognize interest and penalties, if any, related to unrecognized tax benefits in our provision for income taxes. Tax law requires certain items to be included in our tax returns at different times than such items are reflected in the financial statements. As a result, the annual tax expense reflected in our consolidated statements of earnings is different than that reported in our tax returns. Some of these differences are permanent, such as expenses that are not deductible in our tax returns, and some differences are temporary and reverse over time, such as depreciation expense and amortization expense deductible for income tax purposes. Temporary differences create deferred tax assets and liabilities. Deferred tax liabilities generally represent tax expense recognized in the financial statements for which a tax payment has been deferred, or expense which has been deducted in the tax return but has not yet been recognized in the financial statements. Deferred tax assets generally represent items that can be used as a tax deduction or credit in tax returns in future years for which a benefit has already been recorded in the financial statements. We establish or adjust valuation allowances for deferred tax assets when we estimate that it is more likely than not that future taxable income will be insufficient to fully use a deduction or credit in a specific jurisdiction. In assessing the need for the recognition of a valuation allowance for deferred tax assets, we consider whether it is more likely than not that some portion, or all, of the deferred tax assets will not be realized and adjust the valuation allowance accordingly. We evaluate all significant available positive and negative evidence as part of our analysis. Negative evidence includes the existence of losses in recent years. Positive evidence includes the forecast of future taxable income by jurisdiction, tax-planning strategies that would result in the realization of deferred tax assets and the presence of taxable income in prior carryback years. The underlying assumptions we use in forecasting future taxable income require significant judgment and take into account our recent performance. Such estimates and assumptions could change in the future as more information becomes known which could impact the amounts reported and disclosed herein. The ultimate realization of deferred tax assets depends on the generation of future taxable income during the periods in which temporary differences are deductible or creditable. Fair Value of Financial Instruments Fair value accounting establishes a framework for measuring fair value, which 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 (i.e., an exit price). This framework includes a fair value hierarchy that prioritizes the inputs to the valuation technique used to measure fair value. The classification of a financial instrument within the valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability on the measurement date. The three levels of the hierarchy in order of priority of inputs to the valuation technique are defined as follows: • Level 1 - Valuations are based on unadjusted quoted prices in active markets for identical financial instruments; • Level 2 - Valuations are based on quoted market prices, other than quoted prices included in Level 1, in markets that are not active or on inputs that are observable either directly or indirectly for the full term of the financial instrument; and • Level 3 - Valuations are based on pricing or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement of the financial instrument. Such inputs may reflect management's own assumptions about the assumptions a market participant would use in pricing the financial instrument. 83

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The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measure in its entirety. The carrying amounts of financial assets and liabilities reported in the accompanying consolidated balance sheet for cash and cash equivalents, fiduciary assets, accounts receivable, other current assets, fiduciary liabilities, accrued compensation and other accrued liabilities and deferred revenue - current, at December 31, 2025 and 2024, approximate fair value because of the short-term duration of these instruments. See Note 3 to these consolidated financial statements for the fair values related to the establishment of intangible assets and the establishment and adjustment of earnout payables. See Note 7 to these consolidated financial statements for the fair values related to borrowings outstanding at December 31, 2025 and 2024 under our debt agreements. See Note 12 to these consolidated financial statements for the fair values related to investments at December 31, 2025 and 2024 under our defined benefit pension plan. Litigation We are the defendant in various legal actions related to claims, lawsuits and proceedings incidental to the nature of our business. We record liabilities for loss contingencies, including legal costs (such as fees and expenses of external lawyers and other service providers) to be incurred, when it is probable that a liability has been incurred on or before the balance sheet date and the amount of the liability can be reasonably estimated. We do not discount such contingent liabilities. To the extent recovery of such losses and legal costs is probable under our insurance programs, we record estimated recoveries concurrently with the losses recognized. Significant management judgment is required to estimate the amounts of such contingent liabilities and the related insurance recoveries. In order to assess our potential liability, we analyze our litigation exposure based on available information, including consultation with outside counsel handling the defense of these matters. As these liabilities are uncertain by their nature, the recorded amounts may change due to a variety of different factors, including new developments in, or changes in approach, such as changing the settlement strategy as applicable to each matter. Retention Bonus Arrangements In connection with the hiring and retention of both new talent and experienced personnel, including our senior management, brokers and other key personnel, we have entered into various agreements with key employees setting up the conditions for the cash payment of certain retention bonuses. These bonuses are an incentive for these employees to remain with the Company, for a fixed period of time, to allow us to capitalize on their knowledge and experience. We have various forms of retention bonus arrangements; some are paid up front and some are paid at the end of the term, but all are contingent upon successfully completing a minimum period of employment. A retention bonus that is paid to an employee upfront that is contingent on a certain minimum period of employment, will be initially classified as a prepaid asset and amortized to compensation expense as the future services are rendered over the duration of the stay period. A retention bonus that is paid to an employee at the end of the term that is contingent on a certain minimum period of employment, will be accrued as a liability through compensation expense as the future services are rendered over the duration of the stay period. If an employee leaves prior to the required time frame to earn the retention bonus outright, then all or any portion that is ultimately unearned or refundable, and recovered by the Company if prepaid, is forfeited and reversed through compensation expense. Stock-Based Compensation We have several employee equity-settled and cash-settled share-based compensation plans. Equity-settled share-based payments to employees include grants of stock options, performance stock units and restricted stock units and are measured based on estimated grant date fair value. We have elected to use the Black-Scholes option pricing model to determine the fair value of stock options on the dates of grant. Performance stock units are measured on the probable outcome of the performance conditions applicable to each grant. Restricted stock units are measured based on the fair market values of the underlying stock on the dates of grant. Shares are issued on the vesting dates net of the minimum statutory tax withholding requirements, as applicable, to be paid by us on behalf of our employees. As a result, the actual number of shares issued will be fewer than the actual number of performance stock units and restricted stock units outstanding. Furthermore, we record the liability for withholding amounts to be paid by us as a reduction to additional paid-in capital when paid. Cash-settled share-based payments to employees include awards under our Performance Unit Program and stock appreciation rights. The fair value of the amount payable to employees in respect of cash-settled share-based payments is recognized as compensation expense, with a corresponding increase in liabilities, over the vesting period. The liability is 84

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remeasured at each reporting date and at settlement date. Any changes in fair value of the liability are recognized as compensation expense. We recognize share-based compensation expense over the requisite service period for awards expected to ultimately vest. Forfeitures are estimated on the date of grant and revised if actual or expected forfeiture activity differs from original estimates. Employee Stock Purchase Plan We have an employee stock purchase plan (which we refer to as the ESPP), under which the sale of 8 million shares of our common stock has been authorized. Eligible employees may contribute up to 15% of their compensation towards the quarterly purchase of our common stock at a purchase price equal to 95% of the lesser of the fair market value of our common stock on the first business day or the last business day of the quarterly offering period. Eligible employees may annually purchase shares of our common stock with an aggregate fair market value of up to $25,000 (measured as of the first day of each quarterly offering period of each calendar year), provided that no employee may purchase more than 2,000 shares of our common stock under the ESPP during any calendar year. At December 31, 2025, 4.4 million shares of our common stock was reserved for future issuance under the ESPP. Defined Benefit Pension Plans We recognize in our consolidated balance sheet, an asset for our defined benefit pension plans' overfunded status or a liability for our plans' underfunded status. We recognize changes in the funded status of our defined benefit pension plans in comprehensive earnings in the year in which the changes occur. We use December 31 as the measurement date for our plans' assets and benefit obligations. See Note 12 to these consolidated financial statements for additional information required to be disclosed related to our defined benefit pension plans. 2. Effect of New Accounting Pronouncements Income Taxes In December 31, 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires that an entity, on an annual basis, disclose additional income tax information, primarily related to the rate reconciliation and income taxes paid. The amendment in the ASU is intended to enhance the transparency and decision usefulness of income tax disclosures. We adopted this ASU as of December 31, 2025, which affected our income taxes disclosure. See Note 16 to these consolidated financial statements for further detail regarding the impact of this ASU. Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU 2024-03, Income Statement Reporting–Comprehensive Income–Expense Disaggregation Disclosures (Subtopic 220-40), Disaggregation of Income Statement Expenses. The standard update improves the disclosures about a public business entity's expenses by requiring more detailed information about the types of expenses (including purchases of inventory, employee compensation, depreciation and amortization) included within income statement expense captions. The guidance will be effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The standard updates are to be applied prospectively with the option for retrospective application. We are currently evaluating the impact of adoption of the standard update on its financial statement disclosures. Accounting for Internal-Use Software In September 2025, the FASB issued ASU 2025-06, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software, which amends the guidance in ASC 350-40. The amendments modernize the recognition and disclosure requirements for internal-use software costs, introducing a more judgment-based approach while removing the previous "development stage" model. The amendment in the ASU is effective for all entities for fiscal years beginning after December 15, 2027, and interim periods within those fiscal years, with early adoption permitted. Entities may apply the guidance using a prospective, retrospective or modified transition approach. We are currently evaluating the impact of adoption of the standard update on our financial statement disclosures. 85

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3. Business Combinations During 2025, we acquired substantially all of the ownership interests or net assets, as applicable, of the following firms in exchange for our common stock and/or cash. These acquisitions have been accounted for using the acquisition method for recording business combinations (in millions, except share data): Name and Effective Date of Acquisition Common Shares Issued Common Share Value Cash Paid Accrued Liability Escrow Deposited Recorded Earnout Payable Total Recorded Purchase Price Maximum Potential Earnout Payable (000s) W K Webster & Co Ltd February 1, 2025 (WKW) — $— $139 $2 $— $14 $155 $29 Case Group February 26, 2025 (CSG) — — 58 3 6 14 81 84 Woodruff Sawyer & Co April 10, 2025 (WSC) — — 1,195 12 67 — 1,274 — Dolphin TopCo, Inc., the holding company of AssuredPartners, Inc., August 18, 2025 (APG) — — 13,515 — 300 — 13,815 — Tompkins Insurance Agencies, Inc. October 31, 2025 (TIA) — — 225 8 — — 233 — First Actuarial, LLP November 27, 2025 (FAC) — — 101 4 46 7 158 26 Twenty-seven other acquisitions completed in 2025 64 16 502 19 22 73 632 150 64 $16 $15,735 $48 $441 $108 $16,348 $289 On August 18, 2025, we acquired all of the issued and outstanding stock of Dolphin TopCo, Inc., the holding company of AssuredPartners for gross consideration of $13.8 billion. AssuredPartners is a leading U.S. insurance broker with client capabilities across commercial property/casualty, specialty, employee benefits and personal lines with operations in the U.K. and Ireland. We raised $8.5 billion of cash raised in our December 11, 2024 follow-on common stock offering and $5.0 billion of cash in our December 19, 2024 senior notes issuance (which we refer to, together with the follow-on common stock offering, the "AssuredPartners Financing"), to fund the transaction. On January 7, 2025, we received an additional $1.3 billion of cash due to the exercise by the underwriters of the overallotment provision related to the follow- on common stock offering. AssuredPartners had over 10,900 employees serving through offices located across the U.S., U.K. and Ireland. On April 10, 2025, we acquired all of the issued and outstanding stock of Woodruff Sawyer for consideration of $1.2 billion. We funded the transaction using cash on hand. Woodruff Sawyer provides a full suite of commercial property/ casualty products, employee benefits solutions and risk management services with a focus on middle and large market clients. Immediately prior to closing, Woodruff Sawyer had over 600 employees serving clients through 14 U.S. offices and one U.K. office. Common shares issued in connection with acquisitions are valued at closing market prices as of the effective date of the applicable acquisition or on the days when the shares are issued, if purchase consideration is deferred. We record escrow deposits that are returned to us as a result of adjustments to net assets acquired as reductions of goodwill when the escrows are settled. The maximum potential earnout payables disclosed in the foregoing table represent the maximum amount of additional consideration that could be paid pursuant to the terms of the purchase agreement for the applicable acquisition. The amounts recorded as earnout payables, which are primarily based upon the estimated future operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date, are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration in the foregoing table. We will record subsequent changes in these estimated earnout obligations, including the accretion of discount, in our consolidated statement of earnings when incurred. 86

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The fair value of these earnout obligations is based on the present value of the expected future payments to be made to the sellers of the acquired entities in accordance with the provisions outlined in the respective purchase agreements, which is a Level 3 fair value measurement. In determining fair value, we estimated the acquired entity's future performance using financial projections developed by management for the acquired entity and market participant assumptions that were derived for revenue growth and/or profitability. Revenue growth rates generally ranged from 5% to 18% for our 2025 acquisitions. We estimated future payments using the earnout formula and performance targets specified in each purchase agreement and the financial projections just described. We then discounted these payments to present value using a risk- adjusted rate that takes into consideration market-based rates of return that reflect the ability of the acquired entity to achieve the targets. The discount rates generally ranged from 8% to 9% for our 2025 acquisitions. In some instances, the fair value of these earnout obligations can be based on other valuation methods including the Black-Scholes Option Pricing Method or Monte Carlo Simulation method. Changes in financial projections, market participant assumptions for revenue growth and/or profitability, or the risk-adjusted discount rate, would result in a change in the fair value of recorded earnout obligations. During 2025, 2024 and 2023, we recognized $50 million, $62 million and $77 million respectively, of expense in our consolidated statement of earnings related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions. In addition, during 2025, 2024 and 2023, we recognized $4 million of income, $36 million of income and $301 million of expense, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised assumptions due to changes in interest rates volatility and other assumptions and projections of future performance for 127, 91 and 80 acquisitions, respectively. The net adjustments during 2024, include changes made to the estimated fair value of the Willis Re acquisition earnout and reflect updated assumptions as of December 31, 2024. The aggregate amount of maximum earnout obligations related to acquisitions made in 2022 and subsequent years was $1,518 million as of December 31, 2025, of which $773 million was recorded in the consolidated balance sheet as of that date based on the estimated fair value of the expected future payments to be made, of which approximately $535 million can be settled in cash or common stock at our option and $238 million must be settled in cash. The aggregate amount of maximum earnout obligations related to acquisitions made in 2021 and subsequent years was $1,998 million as of December 31, 2024, of which $1,302 million was recorded in the consolidated balance sheet as of that date based on the estimated fair value of the expected future payments to be made, of which approximately $512 million can be settled in cash or common stock at our option and $790 million must be settled in cash. The following is a summary of the estimated fair values of the net assets acquired at the date of each acquisition made in 2025 (in millions): WKW CSG WSC APG TIA FAC Twenty-seven Other Acquisitions Total Cash and cash equivalents $5 $6 $62 $276 $13 $8 $30 $400 Fiduciary assets 87 — 465 1,032 7 — 55 1,646 Other current assets 17 4 79 938 7 23 20 1,088 Fixed assets 3 1 13 134 2 — 1 154 Noncurrent assets 2 — 25 237 — 2 2 268 Goodwill 100 59 823 8,376 82 97 367 9,904 Expiration lists 54 25 459 5,993 135 47 307 7,020 Non-compete agreements — 1 — — — 8 10 19 Trade names 2 — 8 27 — — — 37 Total assets acquired 270 96 1,934 17,013 246 185 792 20,536 Fiduciary liabilities 87 — 465 1,032 7 — 55 1,646 Current liabilities 12 7 41 933 6 10 18 1,027 Noncurrent liabilities 16 8 154 1,233 — 17 87 1,515 Total liabilities assumed 115 15 660 3,198 13 27 160 4,188 Total net assets acquired $155 $81 $1,274 $13,815 $233 $158 $632 $16,348 Among other things, these acquisitions allow us to expand into desirable geographic locations, further extend our presence in the retail and wholesale insurance and reinsurance brokerage markets and increase the volume of general services 87

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currently provided. The excess of the purchase price over the estimated fair value of the tangible net assets acquired at the acquisition date was allocated to goodwill, expiration lists, non-compete agreements and trade names in the amounts of $9,904 million, $7,020 million, $19 million and $37 million, respectively, within the brokerage and risk management segments. The fair value of the tangible assets and liabilities for each applicable acquisition at the acquisition date approximated their carrying values. In general, the fair value of expiration lists was established using the excess earnings method, which is an income approach based on estimated financial projections developed by management for each acquired entity using market participant assumptions. Revenue growth and attrition rates generally ranged from 3% to 4% and 5% to 12% for our 2025 and 2024 acquisitions, respectively, for which valuations were performed in 2025. We estimate the fair value as the present value of the benefits anticipated from ownership of the subject expiration list in excess of returns required on the investment in contributory assets necessary to realize those benefits. The rate used to discount the net benefits was based on a risk-adjusted rate that takes into consideration market-based rates of return and reflects the risk of the asset relative to the acquired business. These discount rates generally ranged from 10% to 14% for our 2025 and 2024 acquisitions, for which valuations were performed in 2025. The fair value of non-compete agreements was established using the profit differential method, which is an income approach based on estimated financial projections developed by management for the acquired company using market participant assumptions and various non-compete scenarios. Provisional estimates of fair value are established at the time of each acquisition and are subsequently reviewed and finalized within the first year of operations subsequent to the acquisition date to determine the necessity for adjustments. During this period, we may use independent third-party valuation specialists to assist us in finalizing the fair value of assets acquired and liabilities assumed. Fair value adjustments, if any, are most common to the values established for amortizable intangible assets, including expiration lists, non-compete agreements, acquired software, and for earnout liabilities, with the offset to goodwill, net of any income tax effect. The allocation of the purchase price for AssuredPartners is preliminary, as we have not finalized the valuation of certain acquired identifiable intangible assets and net deferred tax balances. Accordingly, the goodwill recorded also represents a provisional estimate based on information available as of the acquisition date and updated through December 31, 2025. In order to determine the provisional estimates for the acquired identifiable intangible assets and goodwill as of the acquisition date, we applied an estimated allocation of purchase price less the value of net tangible assets acquired to the applicable reporting units. At the reporting unit level, we then applied an estimated allocation of the purchase price to acquired identifiable intangible assets. The estimated allocation was primarily based on preliminary information compiled by the independent third party valuation specialists, data from our prior independent acquisition valuations for similar businesses to AssuredPartners, data from AssuredPartners' historical independent acquisition valuations, information obtained during our due diligence process and net working capital settlement information that occurred subsequent to the acquisition date that relates to facts and circumstances existing as of the acquisition date. We have engaged independent third-party valuation specialists to assist us in determining the fair value of assets acquired and liabilities assumed for this transaction. December 31, 2025, and as of the date of this filing, the specialists have not completed their analysis and thus these AssuredPartners fair value estimates are provisional. These provisional fair value estimates will be subsequently reviewed and adjusted based on the results of the final valuation analysis, which will be completed in 2026. Expiration lists, non-compete agreements and trade names related to our acquisitions are amortized using the straight-line method over their estimated useful lives (two to fifteen years for expiration lists, two to six years for non-compete agreements and two to fifteen years for trade names), while goodwill is not subject to amortization. We use the straight-line method to amortize these intangible assets because the pattern of their economic benefits cannot be reasonably determined with any certainty. We review all of our identifiable intangible assets for impairment periodically (at least annually) and whenever events or changes in business circumstances indicate that the carrying value of the assets may not be recoverable. In reviewing identifiable intangible assets, if the undiscounted future cash flows were less than the carrying amount of the respective (or underlying) asset, an indicator of impairment would exist and further analysis would be required to determine whether or not a loss would need to be charged against current period earnings as a component of amortization expense. Of the $7,020 million of expiration lists, $19 million of non-compete agreements and $37 million of trade names related to the 2025 acquisitions, $6,681 million, $11 million and $37 million, respectively, is not expected to be deductible for income tax purposes. Accordingly, we recorded a net deferred tax liability of $720 million, and a corresponding amount of goodwill, in 2025 related to the nondeductible amortizable intangible assets. 88

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Our consolidated financial statements for the year ended December 31, 2025 include the operations of the acquired entities from their respective acquisition dates. The following is a summary of the unaudited pro forma historical results, as if these entities had been acquired at January 1, 2024 (in millions, except per share data): Year Ended December 31, 2025 2024 Total revenues $16,256 $15,024 Net earnings attributable to controlling interests 1,623 1,474 Basic net earnings per share 6.34 5.81 Diluted net earnings per share 6.24 5.71 The unaudited pro forma results above have been prepared for comparative purposes only and do not purport to be indicative of the results of operations which actually would have resulted had these acquisitions occurred at January 1, 2024, nor are they necessarily indicative of future operating results. Annualized revenues of entities acquired in 2025 totaled approximately $3,562 million. Total revenues, earnings before income tax and net earnings before interest, income taxes, depreciation, amortization and the change in estimated acquisition earnout payables recorded in our consolidated statement of earnings for 2025 related to the 2025 acquisitions in the aggregate, were $1,369 million, $25 million and $296 million, respectively. 4. Contracts with Customers Contract Assets and Liabilities/Contract Balances Information about unbilled receivables, contract assets and contract liabilities from contracts with customers is as follows (in millions): December 31, 2025 December 31, 2024 Unbilled receivables $1,858 $1,274 Deferred contract costs 338 207 Deferred revenue 892 604 The unbilled receivables, which are included in accounts receivable, net in our consolidated balance sheet, primarily relate to our rights to consideration for work completed but not billed at the reporting date. These are transferred to the billed accounts receivables when the client is invoiced. The deferred contract costs represent the costs we incur to fulfill a new or renewal contract with our clients prior to the effective date of the contract. These costs are expensed on the contract effective date. The deferred revenue in the consolidated balance sheet included amounts that represent the remaining performance obligations under our contracts and amounts collected related to advanced billings and deposits received from customers that may or may not ultimately be recognized as revenues in the future. Deposits received from customers could be returned to the customers based on lesser actual transactional volume than originally billed volume. 89

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Significant changes in the deferred revenue balances, which include foreign currency translation adjustments, during the period are as follows (in millions): Brokerage Risk Management Total Deferred revenue at December 31, 2023 $533 $172 $705 Incremental deferred revenue 305 91 396 Revenue recognized during the year ended December 31, 2024 included in deferred revenue at December 31, 2023 (390) (86) (476) Net change in collected billings/deposits received from customers (40) (4) (44) Impact of changes in foreign exchange rates — — — Deferred revenue recognized from business acquisitions 23 — 23 Deferred revenue at December 31, 2024 431 173 604 Incremental deferred revenue 296 112 408 Revenue recognized during the year ended December 31, 2025 included in deferred revenue at December 31, 2024 (335) (88) (423) Net change in collected billings/deposits received from customers (4) 2 (2) Impact of changes in foreign exchange rates (21) — (21) Deferred revenue recognized from business acquisitions 326 — 326 Deferred revenue at December 31, 2025 $693 $199 $892 Revenue recognized during 2025 in the table above included revenue from 2024 acquisitions that would not be reflected in prior years. Remaining Performance Obligations Remaining performance obligations represent the portion of the contract price for which work has not been performed. As of December 31, 2025, the aggregate amount of the contract price allocated to remaining performance obligations was $892 million. The estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period is as follows (in millions): Brokerage Risk Management Total 2026 $668 $47 $715 2027 22 77 99 2028 1 35 36 2029 1 17 18 2030 — 8 8 Thereafter 1 15 16 Total $693 $199 $892 Deferred Contract Costs We capitalize costs incurred to fulfill contracts as "deferred contract costs" which are included in other current assets in our consolidated balance sheet. Deferred contract costs were $338 million and $207 million as of December 31, 2025 and 2024, respectively. Capitalized fulfillment costs are amortized to expense on the contract effective date. The amount of amortization of the deferred contract costs was $909 million and $666 million for the years ended December 31, 2025 and 2024, respectively. We have applied the practical expedient to recognize the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that we otherwise would have recognized is one year or less for our 90

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brokerage segment. These costs are included in compensation and operating expenses in our consolidated statement of earnings. 5. Fixed Assets Major classes of fixed assets consist of the following (in millions): December 31, 2025 2024 Office equipment $53 $34 Furniture and fixtures 215 152 Leasehold improvements 326 260 Computer equipment 439 362 Land and buildings - corporate headquarters 174 172 Software 942 721 Other 42 41 Work in process 80 64 2,271 1,806 Accumulated depreciation (1,482) (1,156) Net fixed assets $789 $650 The amounts in work in process in the table above primarily are for capitalized expenditures incurred related to IT development projects in 2025 and 2024. 6. Intangible Assets The carrying amount of goodwill at December 31, 2025 and 2024 allocated by domestic and foreign operations is as follows (in millions): Brokerage Risk Management Corporate Total At December 31, 2025 United States $16,428 $109 $— $16,537 United Kingdom 2,889 142 — 3,031 Canada 628 — — 628 Australia 591 238 — 829 New Zealand 225 8 — 233 Other foreign 1,317 — 18 1,335 Total goodwill - net $22,078 $497 $18 $22,593 At December 31, 2024 United States $6,966 $75 $— $7,041 United Kingdom 2,591 26 — 2,617 Canada 587 — — 587 Australia 509 219 — 728 New Zealand 183 8 — 191 Other foreign 1,087 — 19 1,106 Total goodwill - net $11,923 $328 $19 $12,270 91

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The changes in the carrying amount of goodwill for 2025 and 2024 are as follows (in millions): Brokerage Risk Management Corporate Total Balance as of December 31, 2023 $11,218 $239 $19 $11,476 Goodwill acquired during the year 830 7 — 837 Goodwill adjustments related to appraisals and other acquisition adjustments 98 101 — 199 Goodwill written-off related to sales of business (6) — — (6) Foreign currency translation adjustments during the year (217) (19) — (236) Balance as of December 31, 2024 11,923 328 19 12,270 Goodwill acquired during the year 9,770 134 — 9,904 Goodwill adjustments related to appraisals and other acquisition adjustments 32 9 — 41 Goodwill written-off related to sales of business (20) — — (20) Foreign currency translation adjustments during the year 373 26 (1) 398 46022 $22,078 $497 $18 $22,593 Major classes of amortizable intangible assets consist of the following (in millions): December 31, 2025 2024 Expiration lists $15,968 $8,764 Accumulated amortization - expiration lists (5,357) (4,313) 10,611 4,451 Non-compete agreements 125 118 Accumulated amortization - non-compete agreements (98) (86) 27 32 Trade names 160 120 Accumulated amortization - trade names (114) (73) 46 47 Net amortizable assets $10,684 $4,530 Estimated aggregate amortization expense for each of the next five years is as follows (in millions): 2026 $1,105 2027 1,071 2028 1,028 2029 973 2030 917 Thereafter 5,590 Total $10,684 92

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7. Credit and Other Debt Agreements The following is a summary of our corporate and other debt (in millions): December 31, 2025 2024 Senior Notes: Semi-annual payments of interest, fixed rate of 4.60%, balloon due December 15, 2027 $750 $750 Semi-annual payments of interest, fixed rate of 4.85%, balloon due December 15, 2029 750 750 Semi-annual payments of interest, fixed rate of 2.40%, balloon due November 9, 2031 400 400 Semi-annual payments of interest, fixed rate of 5.00%, balloon due February 15, 2032 500 500 Semi-annual payments of interest, fixed rate of 5.50%, balloon due March 2, 2033 350 350 Semi-annual payments of interest, fixed rate of 6.50%, balloon due February 15, 2034 400 400 Semi-annual payments of interest, fixed rate of 5.45%, balloon due July 15, 2034 500 500 Semi-annual payments of interest, fixed rate of 5.15%, balloon due February 15, 2035 1,500 1,500 Semi-annual payments of interest, fixed rate of 3.50%, balloon due May 20, 2051 850 850 Semi-annual payments of interest, fixed rate of 3.05%, balloon due March 9, 2052 350 350 Semi-annual payments of interest, fixed rate of 5.75%, balloon due March 2, 2053 600 600 Semi-annual payments of interest, fixed rate of 6.75%, balloon due February 15, 2054 600 600 Semi-annual payments of interest, fixed rate of 5.75%, balloon due July 15, 2054 500 500 Semi-annual payments of interest, fixed rate of 5.55%, balloon due February 15, 2055 1,500 1,500 Total Senior Notes 9,550 9,550 Note Purchase Agreements: Semi-annual payments of interest, fixed rate of 4.31%, balloon due June 24, 2025 — 200 Semi-annual payments of interest, fixed rate of 4.85%, balloon due February 13, 2026 140 140 Semi-annual payments of interest, fixed rate of 4.73%, balloon due February 27, 2026 175 175 Semi-annual payments of interest, fixed rate of 4.40%, balloon due June 2, 2026 175 175 Semi-annual payments of interest, fixed rate of 4.36%, balloon due June 24, 2026 150 150 Semi-annual payments of interest, fixed rate of 3.75%, balloon due January 30, 2027 30 30 Semi-annual payments of interest, fixed rate of 4.09%, balloon due June 27, 2027 125 125 Semi-annual payments of interest, fixed rate of 4.09%, balloon due August 2, 2027 125 125 Semi-annual payments of interest, fixed rate of 4.14%, balloon due August 4, 2027 98 98 Semi-annual payments of interest, fixed rate of 3.46%, balloon due December 1, 2027 100 100 Semi-annual payments of interest, fixed rate of 4.55%, balloon due June 2, 2028 75 75 Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 13, 2028 125 125 Semi-annual payments of interest, fixed rate of 5.04%, balloon due February 13, 2029 100 100 Semi-annual payments of interest, fixed rate of 4.98%, balloon due February 27, 2029 100 100 Semi-annual payments of interest, fixed rate of 4.19%, balloon due June 27, 2029 50 50 Semi-annual payments of interest, fixed rate of 4.19%, balloon due August 2, 2029 50 50 Semi-annual payments of interest, fixed rate of 3.48%, balloon due December 2, 2029 50 50 Semi-annual payments of interest, fixed rate of 3.99%, balloon due January 30, 2030 341 341 Semi-annual payments of interest, fixed rate of 4.44%, balloon due June 13, 2030 125 125 Semi-annual payments of interest, fixed rate of 5.14%, balloon due March 13, 2031 180 180 Semi-annual payments of interest, fixed rate of 4.70%, balloon due June 2, 2031 25 25 Semi-annual payments of interest, fixed rate of 4.09%, balloon due January 30, 2032 69 69 Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 27, 2032 75 75 Semi-annual payments of interest, fixed rate of 4.34%, balloon due August 2, 2032 75 75 Semi-annual payments of interest, fixed rate of 4.59%, balloon due June 13, 2033 125 125 Semi-annual payments of interest, fixed rate of 5.29%, balloon due March 13, 2034 40 40 Semi-annual payments of interest, fixed rate of 4.48%, balloon due June 12, 2034 175 175 Semi-annual payments of interest, fixed rate of 4.24%, balloon due January 30, 2035 79 79 Semi-annual payments of interest, fixed rate of 2.44%, balloon due February 10, 2036 100 100 Semi-annual payments of interest, fixed rate of 2.46%, balloon due May 5, 2036 75 75 Semi-annual payments of interest, fixed rate of 4.69%, balloon due June 13, 2038 75 75 Semi-annual payments of interest, fixed rate of 5.45%, balloon due March 13, 2039 40 40 93

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Semi-annual payments of interest, fixed rate of 4.49%, balloon due January 30, 2040 56 56 Total Note Purchase Agreements 3,323 3,523 Credit Agreement: Periodic payments of interest and principal, expires April 3, 2030 — — Premium Financing Debt Facility - expires October 31, 2027: Facility B AUD denominated tranche, interbank rates plus 1.300% 217 218 NZD denominated tranche, interbank rates plus 1.850% — — Facility C and D AUD denominated tranche, interbank rates plus 0.780% — — NZD denominated tranche, interbank rates plus 0.990% 9 7 Total Premium Financing Debt Facility 226 225 Total corporate and other debt 13,099 13,298 Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements (81) (90) Less unamortized discount on Bonds Payable (48) (51) Net corporate and other debt $12,970 $13,157 The Senior Notes in the table above are registered by the Company with the Securities and Exchange Commission and are not guaranteed. Senior Notes - On December 19, 2024, we closed and funded an offering of $5,000 million of unsecured senior notes in five tranches. The $750 million aggregate principal amount of 4.60% Senior Notes is due in 2027, $750 million aggregate principal amount of 4.85% Senior Notes is due in 2029, $500 million aggregate principal amount of 5.00% Senior Notes is due in 2032, $1,500 million aggregate principal amount of 5.15% Senior Notes is due in 2035 and $1,500 million aggregate principal amount 5.55% Senior Notes is due in 2055. The weighted average interest rate is 5.25% per annum after giving effect to underwriting costs and a net hedge gain. During 2024, we entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash gain of approximately $4 million on the hedging transactions that will be recognized on a pro rata basis as a decrease to our reported interest expense over ten years. We used the net proceeds of this offering to fund a portion of the cash consideration payable in connection with the AssuredPartners acquisition and for general corporate purposes including other acquisitions. On February 12, 2024, we closed and funded an offering of $1,000 million of unsecured senior notes in two tranches. The $500 million aggregate principal amount of 5.45% Senior Notes is due in 2034 and $500 million aggregate principal amount of 5.75% Senior Notes is due in 2054. The weighted average interest rate is 5.71% per annum after giving effect to underwriting costs and a net hedge loss. During 2024, we entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash loss of approximately $1 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over ten years. We used the proceeds of these offerings to fund acquisitions, earnout payments related to acquisitions and general corporate purposes. Note Purchase Agreements - During June 2025, we used operating cash to fund the $200 million Series O note maturity that had a fixed rate of 4.31% that was due June 24, 2025. During February 2024, we used operating cash to fund the $100 million Series HH note maturity that had a fixed rate of 4.72% that was due February 13, 2024 and the $325 million Series H note maturity that had a fixed rate of 4.58% that was due February 27, 2024. Under the terms of the note purchase agreements described above, we may redeem the notes at any time, in whole or in part, at 100% of the principal amount of such notes being redeemed, together with accrued and unpaid interest and a "make-whole amount". The "make-whole amount" is derived from a net present value computation of the remaining scheduled payments of principal and interest using a discount rate based on the U.S. Treasury yield plus 0.5% and is designed to compensate the purchasers of the notes for their investment risk in the event prevailing interest rates at the time of prepayment are less favorable than the interest rates under the notes. We do not currently intend to prepay any of the notes. The note purchase agreements described above contain customary provisions for transactions of this type, including representations and warranties regarding us and our subsidiaries and various financial covenants, including covenants that require us to maintain specified financial ratios. We were in compliance with these covenants as of December 31, 2025. The note purchase agreements also provide customary events of default, generally with corresponding grace periods, 94

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including, without limitation, payment defaults with respect to the notes, covenant defaults, cross-defaults to other agreements evidencing our or our subsidiaries' indebtedness, certain judgments against us or our subsidiaries and events of bankruptcy involving us or our material subsidiaries. The notes issued under the note purchase agreement are senior unsecured obligations of ours and rank equal in right of payment with our Credit Agreement discussed below. Credit Agreement - On April 3, 2025, we entered into an amendment and restatement to our Credit Agreement dated June 22, 2023 (which, as amended and restated, refer to as the Credit Agreement). The Credit Agreement provides for a five- year unsecured revolving credit facility in the amount of $2,500 million, which is also available in Pounds Sterling, Canadian Dollars, Australian Dollars, New Zealand Dollars, Euros, Japanese Yen and any other currencies agreed by the lenders. The Credit Agreement also includes a $75 million letter of credit sub-facility and a $250 million Euro swingline sub-facility. We may also, upon the agreement of either one or more then-existing lenders or of additional banks not currently party to the Credit Agreement, increase the commitments under the Credit Agreement up to $3,000 million. The amendment and restatement, among other things, also extended the maturity date from June 22, 2028 to April 3, 2030 and updated the facility fee and applicable margin as determined by reference to the rating of our long-term senior unsecured debt. The Credit Agreement permits us to designate wholly-owned subsidiaries located in certain jurisdictions as additional borrowers, the obligations of which under the Credit Agreement will be guaranteed by the Company, subject to the terms and conditions set forth in the Credit Agreement. Any subsidiary that guarantees any notes under the Company's existing note purchase agreements is required to guarantee the obligations under the Credit Agreement. There are currently no subsidiary borrowers or guarantors under the Credit Agreement. Loans borrowed under the Credit Agreement bear interest at a variable annual rate based on a customary benchmark rate for each available currency including Secured Overnight Financing Rate (which we refer to as SOFR) for loans in U.S. Dollars, or at our election solely for loans in U.S. Dollars, the base rate, plus in each case an applicable margin. Interest rates on base rate loans and outstanding drawings on letters of credit under the Credit Agreement will be based on the Base Rate, as defined in the Credit Agreement, plus a margin of 0.00% to 0.375%, depending on the rating of our long-term senior unsecured debt. Interest rates for SOFR loans and loans in currencies other than U.S. dollars under the Credit Agreement will be based on, as applicable, a SOFR Daily Floating Rate, Term SOFR, Alternative Currency Daily Rate or Alternative Currency Term Rate, as defined in the Credit Agreement, plus a margin of 0.775% to 1.375%, depending on the rating of our long-term senior unsecured debt. The annual facility fee related to the Credit Agreement is between 0.100% and 0.250% of the revolving credit commitment, depending on the rating of our long-term senior unsecured debt. Subject to certain conditions stated in the Credit Agreement, we may borrow, prepay and reborrow amounts under the Credit Agreement at any time during the term of the Credit Agreement. Funds borrowed under the Credit Agreement may be used for general corporate and working capital purposes of the Company and its subsidiaries. The Credit Agreement also contains customary representations and warranties and affirmative and negative covenants, including financial covenants, as well as customary events of default, with corresponding grace periods, including without limitations, payment defaults, cross-defaults to other agreements evidencing indebtedness and bankruptcy-related defaults. We were in compliance with these covenants as of December 31, 2025. At December 31, 2025, $2 million of letters of credit (for which we had $11 million of liabilities recorded at December 31, 2025) were outstanding under the Credit Agreement. See Note 15 to these consolidated financial statements for a discussion of the letters of credit. There were no borrowings outstanding under the Credit Agreement at December 31, 2025. Accordingly, at December 31, 2025, $2,498 million remained available for potential borrowings. Premium Financing Debt Facility - On November 17, 2025, we entered into an amendment to our revolving loan facility (which we refer to as the Premium Financing Debt Facility), that provides funding for the three Australian (AU) and New Zealand (NZ) premium finance subsidiaries. The Premium Financing Debt Facility is comprised of: (i) Facility B is separated into AU$390 million and NZ$25 million tranches (the AU$ tranche will be decreased on March 2, 2026 to AU$310 million and the NZ$ tranche will be decreased as of March 2, 2026 to NZ$10 million), (ii) Facility C, an AU$60 million equivalent multi-currency overdraft tranche and (iii) Facility D, a NZ$15 million equivalent multi-currency overdraft tranche. The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.300% and 1.850% for the AU$ and NZ$ tranches, respectively. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.780% and 0.990% for the AU$ and NZ$ tranches, respectively. The annual fee for Facility B is 95

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0.52% and 0.8325% for the undrawn commitments for the AU$ and NZ$ tranches, respectively. The annual fee for Facility C is 0.77% and for Facility D is 0.90% of the total commitments of the facilities. The terms of our Premium Financing Debt Facility include various financial covenants, including covenants that require us to maintain specified financial ratios. We were in compliance with these covenants as of December 31, 2025. The Premium Financing Debt Facility also includes customary provisions for transactions of this type, including events of default, with corresponding grace periods and cross-defaults to other agreements evidencing our indebtedness. Facilities B, C and D are secured by the premium finance receivables of the Australian and New Zealand premium finance subsidiaries. At December 31, 2025, AU$325 million and NZ$0 million of borrowings were outstanding under Facility B, AU$0 million of borrowings outstanding under Facility C and NZ$15 million of borrowings were outstanding under Facility D, which in aggregate amount to US$226 million of borrowings outstanding under the Premium Financing Debt Facility. Accordingly, as of December 31, 2025, AU$65 million and NZ$25 million remained available for potential borrowing under Facility B, and AU$60 million and NZ$0 million under Facilities C and D, respectively. See Note 15 to these consolidated financial statements for additional discussion on our contractual obligations and commitments as of December 31, 2025. The aggregate estimated fair value of the $12,873 million in debt under our various senior notes and note purchase agreements at December 31, 2025 was $12,183 million due to the long-term duration and fixed interest rates associated with these debt obligations. No active or observable market exists for our private long-term debt. Therefore, the estimated fair value of this debt is based on the income valuation approach, which is a valuation technique that converts future amounts (for example, cash flows or income and expenses) to a single current (that is, discounted) amount. The fair value measurement is determined on the basis of the value indicated by current market expectations about those future amounts. Because our debt issuances generate a measurable income stream for each lender, the income approach was deemed to be an appropriate methodology for valuing the private placement long-term debt. The methodology used calculated the original deal spread at the time of each debt issuance, which was equal to the difference between the yield of each issuance (the coupon rate) and the equivalent benchmark treasury yield at that time. The market spread as of the valuation date was calculated, which is equal to the difference between an index for investment grade insurers and the equivalent benchmark treasury yield today. An implied premium or discount to the par value of each debt issuance based on the difference between the origination deal spread and market as of the valuation date was then calculated. The index we relied on to represent investment graded insurers was the Bloomberg Valuation Services (BVAL) U.S. Insurers BBB index. This index is comprised primarily of insurance brokerage firms and was representative of the industry in which we operate. For the purpose of our analysis, the average BBB rate was assumed to be the appropriate borrowing rate for us. The estimated fair value of the borrowings outstanding under our Credit Agreement approximate their carrying value due to their short-term duration and variable interest rates. The estimated fair value of the $226 million of borrowings outstanding under our Premium Financing Debt Facility approximates their carrying value due to their short-term duration and variable interest rates. 8. Earnings per Share The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share data): Year Ended December 31, 2025 2024 2023 Net earnings attributable to controlling interests $1,494 $1,463 $970 Weighted average number of common shares outstanding 256.1 220.5 214.9 Dilutive effect of stock options using the treasury stock method 4.0 4.5 4.4 Weighted average number of common and common equivalent shares outstanding 260.1 225.0 219.3 Basic net earnings per share $5.83 $6.63 $4.51 Diluted net earnings per share $5.74 $6.50 $4.42 Anti-dilutive stock-based awards of 0.9 million shares were outstanding at December 31, 2025, 2024 and 2023 but were excluded in the computation of the dilutive effect of stock-based awards for the years then ended. These stock-based 96

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awards were excluded from the computation because the exercise prices on these stock-based awards were greater than the average market price of our common shares during the respective period, and therefore, would be anti-dilutive to earnings per share under the treasury stock method. 9. Stock Option Plans On May 10, 2022, our stockholders approved the Arthur J. Gallagher & Co. 2022 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved Arthur J. Gallagher & Co. 2017 Long-Term Incentive Plan (which we refer to as the 2017 LTIP). The LTIP term began May 10, 2022 and terminates on the date of the annual meeting of stockholders in 2032, unless terminated earlier by our board of directors. All of our officers, employees and non-employee directors are eligible to receive awards under the LTIP. The compensation committee of our board of directors determines the annual number of shares delivered under the LTIP. The LTIP provides for non-qualified and incentive stock options, stock appreciation rights, restricted stock and restricted stock units, any or all of which may be made contingent upon the achievement of performance criteria. Shares of our common stock available for issuance under the LTIP include authorized and unissued shares of common stock or authorized and issued shares of common stock reacquired and held as treasury shares or otherwise, or a combination thereof. The number of available shares will be reduced by the aggregate number of shares that become subject to outstanding awards granted under the LTIP. A maximum of 3.5 million shares issued for full value awards (i.e., awards other than stock options or stock appreciation rights) will be counted one-for-one against the 13.5 million share pool, and every share subject to a full value award in excess of such limit count as 3.8 shares against the pool. To the extent that shares subject to an outstanding award granted under either the LTIP or prior equity plans are not issued or delivered by reason of the expiration, termination, cancellation or forfeiture of such award or by reason of the settlement of such award in cash, then such shares will again be available for grant under the LTIP. The maximum number of shares available under the LTIP for restricted stock, restricted stock unit awards and performance unit awards settled with stock (i.e., all awards other than stock options and stock appreciation rights) is 2.1 million as of December 31, 2025. The LTIP provides for the grant of stock options, which may be either tax-qualified incentive stock options or non- qualified options and stock appreciation rights. The compensation committee determines the period for the exercise of a non-qualified stock option, tax-qualified incentive stock option or stock appreciation right, provided that no option can be exercised later than seven years after its date of grant. The exercise price of a non-qualified stock option or tax-qualified incentive stock option and the base price of a stock appreciation right cannot be less than 100% of the fair market value of a share of our common stock on the date of grant, provided that the base price of a stock appreciation right granted in tandem with an option will be the exercise price of the related option. Upon exercise, the option exercise price may be paid in cash, by the delivery of previously owned shares of our common stock, through a net-exercise arrangement, or through a broker-assisted cashless exercise arrangement. The compensation committee determines all of the terms relating to the exercise, cancellation or other disposition of an option or stock appreciation right upon a termination of employment, whether by reason of disability, retirement, death or any other reason. Stock option and stock appreciation right awards under the LTIP are non-transferable. On March 1, 2025, the compensation committee granted 829,000 options under the LTIP to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2028, 2029 and 2030, respectively. On March 1, 2024, the compensation committee granted 1,044,000 options under the LTIP to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2027, 2028 and 2029, respectively. On March 15, 2023, the compensation committee granted 1,131,000 options under the LTIP to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2026, 2027 and 2028, respectively. The 2025, 2024 and 2023 options expire seven years from the date of grant, or earlier in the event of certain terminations of employment. Stock options granted in 2023 to certain executive officers age 55 or older are not subject to forfeiture upon such officers' departure from the Company after two years from date of grant. Stock options granted in 2025 and 2024 to executive officers are not subject to forfeiture upon such officers' departure from the Company once they attain the age of 62. 97

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Our stock option plans provide for the immediate vesting of all outstanding stock option grants in the event of a change in control of the Company, as defined in the applicable plan documents. During 2025, 2024 and 2023, we recognized $54 million, $48 million, and $34 million, respectively, of compensation expense related to our stock option grants. For purposes of expense recognition in 2025, 2024 and 2023, the estimated fair values of the stock option grants are amortized to expense over the options' vesting period. We estimated the fair value of stock options at the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions: Year Ended December 31, 2025 2024 2023 Expected dividend yield 0.8 % 1.0 % 1.2 % Expected risk-free interest rate 4.1 % 4.2 % 3.6 % Volatility 25.4 % 25.3 % 25.0 % Expected life (in years) 5.5 5.5 5.5 Option valuation models require the input of highly subjective assumptions including the expected stock price volatility. The Black-Scholes option pricing model was developed for use in estimating the fair value of traded options which have no vesting restrictions and are fully transferable. The weighted average fair value per option for all options granted during 2025, 2024 and 2023, as determined on the grant date using the Black-Scholes option pricing model, was $98.27, $69.55 and $46.48, respectively. The following is a summary of our stock option activity and related information for 2025 and 2024 (in millions, except exercise price and year data): Shares Under Option Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Year Ended December 31, 2025 Beginning balance 7.3 $148.26 Granted 0.8 337.75 Exercised (1.2) 104.78 Forfeited or canceled (0.2) 196.67 Ending balance 6.7 $177.48 3.43 $609 Exercisable at end of year 2.2 $111.16 1.71 $320 Ending unvested and expected to vest 4.3 $206.25 4.20 $279 Year Ended December 31, 2024 Beginning balance 7.9 $123.85 Granted 1.0 243.54 Exercised (1.4) 77.93 Forfeited or canceled (0.2) 160.87 Ending balance 7.3 $148.26 3.78 $995 Exercisable at end of year 1.7 $90.06 1.78 $337 Ending unvested and expected to vest 5.2 $164.49 4.40 $624 Options with respect to 10.2 million shares (less any shares of restricted stock issued under the LTIP - see Note 11 to these consolidated financial statements) were available for grant under the LTIP at December 31, 2025. 98

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The total intrinsic value of options exercised during 2025, 2024 and 2023 amounted to $251 million, $244 million and $182 million, respectively. As of December 31, 2025, we had approximately $137 million of total unrecognized compensation expense related to nonvested options. We expect to recognize that cost over a weighted average period of approximately four years. Other information regarding stock options outstanding and exercisable at December 31, 2025 is summarized as follows (in millions, except exercise price and year data): Range of Exercise Prices Options Outstanding Options Exercisable Number Outstanding Weighted Average Remaining Contractual Term (in years) Weighted Average Exercise Price Number Exercisable Weighted Average Exercise Price $79.59 $— $79.59 $0.3 $0.20 $79.59 $0.3 $79.59 86.17 — 86.17 0.8 1.19 86.17 0.8 86.17 127.90 — 127.90 1.1 2.21 127.90 0.7 127.90 156.85 — 156.85 0.8 3.09 156.85 0.2 156.85 158.56 — 161.14 0.9 3.21 158.64 0.2 158.59 177.09 — 202.13 1.0 4.20 177.77 — — 238.88 — 243.54 1.0 5.16 243.54 — — 337.74 — 347.44 0.8 6.16 337.75 — — $79.59 $— $347.44 $6.7 $3.43 $177.48 $2.2 $111.16 10. Deferred Compensation We have a Deferred Equity Participation Plan, (which we refer to as the DEPP), which is a non-qualified plan that generally provides for distributions to certain of our key executives when they reach age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement if later. Under the provisions of the DEPP, we typically contribute cash in an amount approved by the compensation committee to a rabbi trust on behalf of the executives participating in the DEPP, and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions based on participant elections. Distributions under the DEPP may not normally be made until the participant reaches age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) and are subject to forfeiture in the event of voluntary termination of employment or termination for cause prior to then. DEPP awards are generally made annually in the first quarter. In addition, we annually make awards under sub-plans of the DEPP for certain production staff, which generally provide for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65. All contributions to the plan (including sub-plans) deemed to be invested in shares of our common stock are distributed in the form of our common stock and all other distributions are paid in cash. Our common stock that is issued to or purchased by the rabbi trust as a contribution under the DEPP is valued at historical cost, which equals its fair market value at the date of grant or date of purchase. When common stock is issued, we record an unearned deferred compensation obligation as a reduction of capital in excess of par value in the accompanying consolidated balance sheet, which is amortized to compensation expense ratably over the vesting period of the participants. Future changes in the fair market value of our common stock owed to the participants do not have any impact on the amounts recorded in our consolidated financial statements. In the first quarter of 2025, 2024 and 2023, the compensation committee approved $22 million, $23 million and $25 million, respectively, of awards in the aggregate to certain key executives under the DEPP that were contributed to the rabbi trust in the first quarters of 2025, 2024 and 2023, respectively. We contributed cash to the rabbi trust and instructed the trustee to acquire a specified number of shares of our common stock on the open market to fund these 2025, 2024 and 2023 awards. During 2025, 2024 and 2023, we charged $18 million, $21 million and $22 million, respectively, to compensation expense related to these awards. 99

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In 2025, 2024 and 2023, the compensation committee approved $2 million, $2 million and $3 million, respectively, of awards under the sub-plans referred to above, which were contributed to the rabbi trust in the first quarters of 2025, 2024 and 2023, respectively. During 2025, 2024 and 2023, we charged $2 million, $2 million and $3 million respectively, to compensation expense related to these awards. There were $13 million, $3 million and $14 million of distributions from the sub-plans during 2025, 2024 and 2023. At December 31, 2025 and 2024, we recorded $81 million (related to 1.8 million shares) and $77 million (related to 2.2 million shares), respectively, of unearned deferred compensation as a reduction of capital in excess of par value in the accompanying consolidated balance sheet. The total intrinsic value of our unvested equity based awards under the plan at December 31, 2025 and 2024 was $475 million and $616 million, respectively. During 2025, 2024 and 2023, cash and equity awards with an aggregate fair value of $83 million, $40 million and $78 million, respectively, were vested and distributed to executives under the DEPP. We have a Deferred Cash Participation Plan (which we refer to as the DCPP), which is a non-qualified deferred compensation plan for certain key employees, other than executive officers, that generally provides for vesting and/or distributions no sooner than five years from the date of awards. Under the provisions of the DCPP, we typically contribute cash in an amount approved by the compensation committee to the rabbi trust on behalf of the executives participating in the DCPP, and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions based on participant elections. In the first quarter of each of 2025, 2024 and 2023, the compensation committee approved $8 million, $8 million and $10 million, respectively, of awards in the aggregate to certain key executives under the DCPP that were contributed to the rabbi trust in second quarters of 2025, 2024 and 2023, respectively. During 2025, 2024 and 2023 we charged $14 million, $19 million and $17 million to compensation expense related to these awards. There were $41 million, $44 million and $23 million of distributions from the DCPP during 2025, 2024 and 2023, respectively. 11. Restricted Stock, Performance Share and Cash Awards Restricted Stock Awards As discussed in Note 9 to these consolidated financial statements, on May 10, 2022, our stockholders approved the LTIP, which replaced our previous stockholder-approved 2017 LTIP. The LTIP provides for the grant of a stock award either as restricted stock or as restricted stock units to officers, employees and non-employee directors. In either case, the compensation committee may determine that the award will be subject to the attainment of performance measures over an established performance period. Stock awards and the related dividend equivalents are non-transferable and subject to forfeiture if the holder does not remain continuously employed with us during the applicable restriction period or, in the case of a performance-based award, if applicable performance measures are not attained. The compensation committee will determine all of the terms relating to the satisfaction of performance measures and the termination of a restriction period, or the forfeiture and cancellation of a restricted stock award upon a termination of employment, whether by reason of disability, retirement, death or any other reason. The agreements awarding restricted stock units under the LTIP will specify whether such awards may be settled in shares of our common stock, cash or a combination of shares and cash and whether the holder will be entitled to receive dividend equivalents, on a current or deferred basis, with respect to such award. Prior to the settlement of a restricted stock unit, the holder of a restricted stock unit will have no rights as a stockholder of the Company. The maximum number of shares available under the LTIP for restricted stock, restricted stock units and performance unit awards settled with stock (i.e., all awards other than stock options and stock appreciation rights) is 4.0 million. At December 31, 2025, 2.1 million shares were available for grant under the LTIP for such awards. In 2025, 2024 and 2023, we granted 304,709, 355,245 and 396,913 restricted stock units, respectively, to employees under the LTIP and 2017 LTIP, with an aggregate fair value of $101 million, $85 million and $67 million, respectively, at the date of grant. In addition to awards made under the LTIP, we also granted employment inducement awards of restricted stock units in third quarter 2025 as contemplated by New York Stock Exchange Listing Rule 303A.08. The inducement awards were intended to provide incentive to certain AssuredPartners individuals in connection with the AssuredPartners acquisition to either remain employed by AssuredPartners through the completion date or to enter into employment with Gallagher. We granted 341,700 restricted stock units to former AssuredPartners employees under these inducement awards with an aggregate fair value of $100 million, at the date of grant, to remain employed by AssuredPartners through the closing date with immediate vesting at the closing date. We granted 708,000 restricted stock units to former AssuredPartners employees under these inducement awards with an aggregate fair value of $215 million, at the date of 100

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grant, to enter into employment with Gallagher, which will vest over a two to five year period commencing August 18, 2025. These 2025, 2024 and 2023, restricted stock units vest as follows: 297,000 units granted in first quarter 2025, 1,000 units granted in second quarter 2025, 300 granted in third quarter 2025, 344,600 units granted in first quarter 2024, 800 units granted in second quarter 2024, 700 units in third quarter 2024, 2,300 units in fourth quarter 2024, 390,000 units granted in first quarter 2023 vest in full based on continued employment through March 1, 2030, March 1, 2029 and March 15, 2028, respectively, while the other 2024 and 2023 restricted stock unit awards generally vest in full based on continued employment through the vesting period on the anniversary date of the grant. For our executive officers age 55 or older, restricted stock units awarded in 2025, 2024 and 2023 are not subject to forfeiture upon such officers' departure from the Company after two years from the date of grant. The vesting periods of the 2025, 2024 and 2023 restricted stock unit awards are as follows (in actual shares): Restricted Stock Units Granted Vesting Period 2025 2024 2023 One year 6,210 6,800 7,360 Five years 298,499 348,445 389,553 Total shares granted 304,709 355,245 396,913 We account for restricted stock awards at historical cost, which equals its fair market value at the date of grant, which is amortized to compensation expense ratably over the vesting period of the participants. Future changes in the fair market value of our common stock that is owed to the participants do not have any impact on the amounts recorded in our consolidated financial statements. During 2025, 2024 and 2023, we charged $75 million, $54 million and $43 million, respectively, to compensation expense related to restricted stock awards granted in 2018 through 2024. The total intrinsic value of unvested restricted stock at December 31, 2025 and 2024 was $643 million and $549 million, respectively. During 2025 and 2024, equity awards (including accrued dividends) with an aggregate fair value of $213 million and $94 million were vested and distributed to employees under this plan. Performance Share Awards On March 1, 2025, March 1, 2024 and March 15, 2023, pursuant to the LTIP, the compensation committee approved 68,000, 58,000 and 58,000, respectively of provisional performance share awards, with an aggregate fair value of $22 million, $14 million and $10 million, respectively, for future grants to our officers. Each performance share award was equivalent to the value of one share of our common stock on the date such provisional award was approved. At the end of the performance period, eligible participants will receive a number of earned shares based on the growth in adjusted EBITDAC per share (as defined in our 2025 Proxy Statement). Earned shares for the 2025, 2024 and 2023 provisional awards will fully vest based on continuous employment through March 1, 2028, March 1, 2027 and March 15, 2026, respectively, and will be settled in unrestricted shares of our common stock on a one-for-one basis as soon as practicable thereafter. The 2025, 2024 and 2023 awards are subject to a three-year performance period that began on January 1, 2025, 2024 and 2023, respectively, and vest on the three-year anniversary of the date of grant (March 1, 2028, March 1, 2027 and March 15, 2026). Performance share awards granted in 2023 to certain executive officers age 55 or older, are not subject to forfeiture upon such officers' departure from the Company after two years from the date of grant. Performance share awards granted in 2024 to executive officers are not subject to forfeiture upon such officers' departure from the Company once they attain the age of 62. In each case, the awards vest on a pro rata basis based on the number of months rounded up during which the officer was employed during the three-year performance period. During 2025, 2024 and 2023, we recognized $26 million, $22 million and $20 million, respectively, to compensation expense related to performance share awards granted in 2020 through 2024. The total intrinsic value of unvested performance share awards at December 31, 2025 and 2024 was $88 million and $93 million. During 2025, 2024 and 2023, equity awards (including accrued dividends) with an aggregate fair value of $36 million, $32 million and $29 million were vested and distributed to employees under this plan. Cash Awards Pursuant to our Performance Unit Program (which we refer to as the Program), there were no units granted in 2025 and 2024. The Program consists of a one-year performance period based on our financial performance and a three-year vesting period measured from January 1 of the year of grant. At the discretion of the compensation committee and determined 101

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based on our performance, the eligible officer or key employee will be granted a percentage of the provisional cash award units that equates to the EBITDAC growth achieved (as defined in the Program). At the end of the performance period, eligible participants will be granted a number of units based on achievement of the performance goal and subject to approval by the compensation committee. Granted units will fully vest based on continuous employment through the three- year vesting period. The ultimate award value will be equal to the trailing twelve-month price of our common stock, multiplied by the number of units subject to the award, but limited to between 0.5 and 1.5 times the original value of the units determined as of the grant date. The fair value of the awarded units will be paid out in cash as soon as practicable. If an eligible employee leaves us prior to the vesting date, the entire award will be forfeited. On March 15, 2022, pursuant to the Program, the compensation committee approved provisional cash awards of $20 million in the aggregate for future grants to our officers and key employees that are denominated in units (125,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional award was approved. Based on our performance for 2022, we granted 122,000 units under the Program in first quarter of 2023 that fully vested on January 1, 2025. During 2025 there was no compensation expense recognized elated to these awards. During both 2024 and 2023 we charged $13 million to compensation expense related to these awards. We did not recognize any compensation expense during 2022 related to the 2022 provisional award under the Program. During 2025, cash awards related to the 2022 provisional awards with an aggregate fair value of $27 million (111,000 units in the aggregate) were vested and distributed to employees under the Program. During 2024, cash awards related to the 2021 provisional awards with an aggregate fair value of $25 million (129,000 units in the aggregate) were vested and distributed to employees under the Program. During 2023, cash awards related to the 2020 provisional awards with an aggregate fair value of $25 million (191,000 units in the aggregate) were vested and distributed to employees under the Program. 12. Retirement Plans We have a noncontributory defined benefit pension plan that, prior to July 1, 2005, covered substantially all of our domestic employees who had attained a specified age and one year of employment. Benefits under the plan were based on years of service and salary history. In 2005, we amended our defined benefit pension plan to freeze the accrual of future benefits for all U.S. employees, effective on July 1, 2005. Since the plan is frozen, there is no difference between the projected benefit obligation and accumulated benefit obligation at December 31, 2025 and 2024. Through the acquisition of the partnership interests of BCHR holdings, L.P. and its subsidiaries dba Buck (which we refer to as Buck) in 2023, we acquired the assets and assumed the liabilities associated with three frozen defined benefit pension plans that provide postretirement benefits to their participants located in the U.S., U.K. and Canada (which we refer to as the Buck Pension Plans). The Buck Pension Plans were amended to freeze benefit plan accruals for all participants (closed to new entrants and existing participants do not accrue any additional benefits) effective December 31, 2014. Effective December 31, 2024, the U.S. Buck Pension Plan was merged into our defined benefit pension plan. In 2025, we initiated a process to fully terminate the plan. In fourth quarter 2025, substantially all of the future obligations under the plan were settled through a combination of lump sum payments to eligible, electing participants and a transfer of the remaining liability through the purchase of a group annuity contract to a highly-rated third-party insurance company. As of December 31, 2025, the only remaining obligations are payments to the Pension Benefit Guaranty Corporation (which we refer to as the PBGC) for missing participants and the distribution of the surplus assets to plan participants. Since there were no other plan benefits remaining on December 31, 2025, no actuarial assumptions were required as of that date. Settlement accounting was measured as of December 31, 2025. In 2026, after the liability for the missing participants has been transferred to the PBGC and the remaining assets have been distributed, the final plan termination accounting will be completed. In fourth quarter 2025, we recognized a non-cash, pre-tax loss of approximately $16 million to operating expense in the consolidated statement of earnings that was offset by an approximately $12 million adjustment to consolidated statement of comprehensive earnings, and a $4 million reversal of a deferred tax asset. In 2026, based on estimates as of December 31, 2025, we expect to recognize a non-cash, pre-tax loss of approximately $17 million to operating expense in the consolidated statement of earnings related to the final plan termination accounting. 102

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In the table below, the service cost component represents plan administration costs that are incurred directly by the plan. A reconciliation of the beginning and ending balances of the pension benefit obligation and fair value of plan assets and the funded status of the plan is as follows (in millions): Year Ended December 31, 2025 2024 Change in pension benefit obligation: Benefit obligation at beginning of year $296 $216 Service cost 1 1 Interest cost 16 10 Merger of the Buck U.S. pension plan — 95 Net actuarial loss (gain) 2 (11) Settlement (293) — Benefits paid (19) (15) Benefit obligation at end of year $3 $296 Change in plan assets: Fair value of plan assets at beginning of year $312 $229 Actual return on plan assets 19 15 Merger of the Buck U.S. pension plan — 84 Contributions by the Company 1 — Settlement (293) — Benefits paid (19) (16) Fair value of plan assets at end of year $20 $312 Funded status of the plan $17 $16 Amounts recognized in the consolidated balance sheet consist of: Prepaid pension asset $17 $16 Accumulated other comprehensive income — 18 Net amount included in retained earnings $17 $34 The components of the net periodic pension benefit cost for the plan and other changes in plan assets and obligations recognized in earnings and other comprehensive earnings consist of the following (in millions): Year Ended December 31, 2025 2024 2023 Net periodic pension cost: Service cost $1 $1 $3 Interest cost on benefit obligation 16 10 11 Expected return on plan assets (15) (16) (14) Amortization of net loss — 3 5 Settlement 16 — — Net periodic benefit income (cost) 18 (2) 5 Other changes in plan assets and obligations recognized in other comprehensive earnings: Net (gain) incurred (2) (10) (12) Amortization of net loss (16) (3) (5) Total recognized in other comprehensive (loss) (18) (13) (17) Total recognized in net periodic pension cost and other comprehensive (loss) $— $(15) $(12) 103

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The following weighted average assumptions were used at December 31 in determining the plan's pension benefit obligation: December 31, 2025 2024 Discount rate N/A 5.50 % Weighted average expected long-term rate of return on plan assets 5.00 % 7.00 % The following weighted average assumptions were used at January 1 in determining the plan's net periodic pension benefit cost: Year Ended December 31, 2025 2024 2023 Discount rate 5.50 % 4.75 % 5.25 % Weighted average expected long-term rate of return on plan assets 5.00 % 7.00 % 7.00 % The following benefit payments are expected to be paid by the plan (in millions): 2026 $17 2027 — 2028 — 2029 — 2030 — 2030 to 2034 — The following is a summary of the plan's weighted average asset at December 31 by asset category: December 31, Asset Category 2025 2024 Equity securities 0 % 0 % Debt securities 100 % 100 % Real estate 0 % 0 % Total 100 % 100 % Plan assets are invested in various pooled separate accounts under annuity contracts managed by two life underwriting enterprises. The plan's investment policy provides that investments will be allocated in a manner designed to provide a long-term investment return greater than the actuarial assumptions, maximize investment return commensurate with risk and to comply with the Employee Income Retirement Security Act of 1974, as amended (which we refer to as ERISA), by investing the funds in a manner consistent with ERISA's fiduciary standards. The weighted average expected long-term rate of return on plan assets assumption was determined based on a review of the asset allocation strategy of the plan using expected ten-year return assumptions for all of the asset classes in which the plan was invested at December 31, 2025 and 2024. The return assumptions used in the valuation were based on data provided by the plan's external investment advisors. 104

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The following is a summary of the plan's assets carried at fair value as of December 31 by level within the fair value hierarchy (in millions): December 31, Fair Value Hierarchy 2025 2024 Level 1 $— $— Level 2 18 205 Level 3 2 107 Total fair value $20 $312 The plan's Level 2 assets consist of ownership interests in various pooled separate accounts within a life insurance carrier's group annuity contract. The fair value of the pooled separate accounts is determined based on the net asset value of the respective funds, which is obtained from the underwriting enterprise and determined each business day with issuances and redemptions of units of the funds made based on the net asset value per unit as determined on the valuation date. We have not adjusted the net asset values provided by the underwriting enterprise. There are no restrictions as to the plan's ability to redeem its investment at the net asset value of the respective funds as of the reporting date. The plan's Level 3 assets consist of pooled separate accounts within another life insurance carrier's annuity contracts for which fair value has been determined by an independent valuation. Due to the nature of these annuity contracts, our management makes assumptions to determine how a market participant would price these Level 3 assets. In determining fair value, the future cash flows to be generated by the annuity contracts were estimated using the underlying benefit provisions specified in each contract, market participant assumptions and various actuarial and financial models. These cash flows were then discounted to present value using a risk-adjusted rate that takes into consideration market based rates of return and probability-weighted present values. The following is a reconciliation of the beginning and ending balances for the Level 3 assets of the plan measured at fair value (in millions): Year Ended December 31, 2025 2024 Fair value at January 1 $107 $109 Settlements (111) (11) Unrealized gain 6 9 Fair value at December 31 $2 $107 We were not required under the IRC to make any minimum contributions to the plan for each of the 2025, 2024 and 2023 plan years. This level of required funding is based on the plan being frozen and the aggregate amount of our historical funding. During 2025, 2024 and 2023 we did not make discretionary contributions to the plan. We comply with the minimum funding requirements in the U.S., U.K. and Canada and make annual contributions to the Buck Pension Plans consistent with those funding requirements. We recognize the funded status of the Buck Pension Plans, measured as the difference between the fair value of the plan assets and the projected benefit obligation, in the accompanying December 31, 2025 and 2024 consolidated balance sheets. We also have a qualified contributory savings and thrift 401(k) plan covering the majority of our domestic employees. For eligible employees who have met the plan's age and service requirements to receive matching contributions, we historically have matched 100% of pre-tax and Roth elective deferrals up to a maximum of 5% of eligible compensation, subject to federal limits on plan contributions and not in excess of the maximum amount deductible for federal income tax purposes. Beginning in 2022, the amount matched by the Company will be discretionary and annually determined by management. Employees must be employed and eligible for the plan on the last day of the plan year to receive a matching contribution, subject to certain exceptions enumerated in the plan document. Matching contributions are subject to a five-year graduated vesting schedule and can be funded in cash or common stock of the Company. We expensed (net of plan forfeitures) $115 million, $105 million and $86 million related to the plan in 2025, 2024 and 2023 respectively. During 2023 and 2024, management determined the 5% employer matching contributions on eligible compensation to the 401(k) plan for the 2023 and 2024 plan years to be funded with our common stock, which were funded in February 2024 and 2025, respectively. 105

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During 2025, management determined the 5% employer matching contributions on eligible compensation to the 401(k) plan for the 2025 plan year would be funded with our common stock, which is expected to be funded in February 2026. We also have a nonqualified deferred compensation plan, the Supplemental Savings and Thrift Plan, for certain employees who, due to IRS rules, cannot take full advantage of our matching contributions under the 401(k) plan. The plan permits these employees to annually elect to defer a portion of their compensation until their retirement or a future date. Our matching contributions to this plan (up to a maximum of the lesser of a participant's elective deferral of base salary, annual bonus and commissions or 5% of eligible compensation, less matching amounts contributed under the 401(k) plan) are also discretionary and annually determined by management. Matching contributions can be funded in cash or common stock of the Company. We expensed $17 million, $14 million and $12 million related to contributions made to a rabbi trust maintained under the plan in 2025, 2024 and 2023, respectively. During 2025, management determined the 5% employer matching contributions on eligible compensation to the plan for the 2025 plan year would be funded with our common stock, which is expected to be funded in February 2026. The fair value of the assets in the plan's rabbi trust at December 31, 2025 and 2024, including employee contributions and investment earnings, was $1,046 million and $909 million, respectively, and has been included in other noncurrent assets and the corresponding liability has been included in other noncurrent liabilities in the accompanying consolidated balance sheet. We also have several foreign benefit plans, the largest of which is a defined contribution plan that provides for us to make contributions of 5% of eligible compensation. In addition, the plan allows for voluntary contributions by U.K. employees, which we match 100%, up to a maximum of an additional 5% of eligible compensation. Net expense for foreign retirement plans amounted to $105 million, $93 million and $77 million in 2025, 2024 and 2023, respectively. 13. Leases We have operating leases primarily related to branch facilities, data centers, sales offices, and agent locations, automobiles and office equipment. Many of our leases include both lease (fixed rent payments) and non-lease components (common- area or other maintenance costs) which are accounted for as a single lease component as we have elected the practical expedient to group lease and non-lease components for all leases. Variable lease payments, such as periodically indexed and/or market adjustments, are presented as lease expense in the period in which they are incurred. Since we did not elect the short-term policy election, we record leases of 12 months or less on the balance sheet. We exclude options to extend or terminate a lease from our recognition as part of our right-of-use assets and lease liabilities until those options are reasonably certain and/or executed. We do not have any material guarantees, options to purchase, or restrictive covenants related to our leases. As our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the lease commencement date in determining the present value of the lease payments. We consider qualitative factors including our derived credit rating, notched adjustments for collateralization, lease term, and, if significant, adjustments to our collateralized rate to borrow in the same currency in which the lease is denominated. The components of lease expense are as follows (in millions): Lease Components Statement of Earnings Classification Year ended December 31, 2025 Operating lease expense Operating expense $167 Variable lease expense Operating expense 32 Sublease income Investment income (2) Total net lease expense $197 Variable lease cost consist primarily of common-area and other maintenance costs for our lease facilities, as well as variable lease payments related to indexed and/or market adjustments. Our sublease income derives primarily from a few office lease arrangements and we have no significant sublease losses. 106

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Year ended Supplemental Cash Flow Information Related to Leases (in millions) December 31, 2025 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $155 Right-of-use assets obtained in exchange for new operating lease liabilities $343 We present all noncash transactions related to adjustments to the lease liability or right-of-use asset as noncash transactions. This includes all noncash charges related to any modification or reassessment events triggering remeasurement. Supplemental balance sheet information related to leases is as follows (in millions, except lease term and discount rate): Lease Components Balance Sheet Classification December 31, 2025 Lease right-of-use assets Right-of-use assets $598 Other current lease liabilities Accrued compensation and other current liabilities 131 Lease liabilities Lease liabilities - noncurrent 515 Total lease liabilities $646 Weighted-average remaining lease term, years 6.1 Weighted-average discount rate 4.9 % Maturities of operating lease liabilities for each of the next five years and thereafter are as follows (in millions): 2026 $173 2027 148 2028 111 2029 84 2030 73 Thereafter 184 Total lease payments 773 Less interest (127) Total $646 Our leases have remaining lease terms of 0.0 years to 12.3 years, some of which may include options to extend the leases for up to 10.0 years and some of which may include options to terminate the leases. As of December 31, 2025, we had $72 million of additional leases that have not yet commenced. These leases will commence in 2026 with lease terms of 6 months to 12.0 years. 14. Derivatives and Hedging Activity We are exposed to market risks, including changes in foreign currency exchange rates and interest rates. To manage the risk related to these exposures, we enter into various derivative instruments that reduce these risks by creating offsetting exposures. We generally do not enter into derivative transactions for trading or speculative purposes. Foreign Exchange Risk Management We are exposed to foreign exchange risk when we earn revenues, pay expenses, or enter into monetary intercompany transfers denominated in a currency that differs from our functional currency, or other transactions that are denominated in a currency other than our functional currency. We use foreign exchange derivatives, typically forward contracts and options, to reduce our overall exposure to the effects of currency fluctuations on cash flows. These exposures are hedged, on average, for less than three years. 107

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Interest Rate Risk Management We enter into various long-term debt agreements. We use interest rate derivatives, typically swaps, to reduce our exposure to the effects of interest rate fluctuations on the forecasted interest rates for up to three years into the future. We have not received or pledged any collateral related to derivative arrangements at December 31, 2025. The notional and fair values of derivatives designated as hedging instruments are as follows at December 31, 2025 and 2024 (in millions): Derivative Assets Derivative Liabilities Instrument Notional Amount Balance Sheet Classification Fair Value Balance Sheet Classification Fair Value At December 31, 2025 Interest rate contracts $1,500 Other current assets $7 Accrued compensation and $8 Other noncurrent assets — other current liabilities Other noncurrent liabilities — Foreign exchange contracts (1) 399 Other current assets 8 Accrued compensation and 1 other current liabilities Other noncurrent assets 8 Other noncurrent liabilities 3 Total $1,899 $23 $12 At December 31, 2024 Interest rate contracts $— Other current assets $— Accrued compensation and $— Other noncurrent assets — other current liabilities Other noncurrent liabilities — Foreign exchange contracts (1) 24 Other current assets 6 Accrued compensation and 2 other current liabilities Other noncurrent assets 3 Other noncurrent liabilities 3 Total $24 $9 $5 (1) Included within foreign exchange contracts at December 31, 2025 were $790 million of call options offset with $790 million of put options, and no buy forwards, offset with $399 million of sell forwards. Included within foreign exchange contracts at December 31, 2024 were $595 million of call options offset with $595 million of put options, and $1 million of buy forwards offset with $26 million of sell forwards. Fair values of these hedge contracts are based on observable and unobservable inputs. Observable inputs include all of the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (for example: interest rates and yield curves observable at commonly quoted intervals, implied volatilities, credit spreads) and market-corroborated inputs. Unobservable inputs are used to measure fair value to the extent that relevant observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. 108

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The effect of cash flow hedge accounting on accumulated other comprehensive loss were as follows (in millions): Instrument Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss (1) Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing Statement of Earnings Classification Year ended December 31, 2025 Interest rate contracts $(16) $(1) $— Interest expense Foreign exchange contracts (5) (13) — Commission revenue (1) 1 Compensation expense (1) — Operating expense Total $(21) $(16) $1 Year ended December 31, 2024 Interest rate contracts $(6) $(1) $— Interest expense Foreign exchange contracts (11) (2) — Commission revenue (2) 1 Compensation expense (2) — Operating expense Total $(17) $(7) $1 (1) During 2025, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a gain of $2 million. We estimate that approximately $21 million of pretax gain currently included within accumulated other comprehensive income will be reclassified into earnings in the next twelve months. 15. Commitments, Contingencies and Off-Balance Sheet Arrangements In connection with our investing and operating activities, we have entered into certain contractual obligations and commitments. See Note 7 to these consolidated financial statements for additional discussion of these obligations and commitments. Our future minimum cash payments, including interest, associated with our contractual obligations pursuant to the Senior Notes, Note purchase agreements, Credit Agreement, Premium Financing Debt Facility, operating leases and purchase commitments at December 31, 2025 were as follows (in millions): Payments Due by Period Contractual Obligations 2026 2027 2028 2029 2030 Thereafter Total Senior Notes $— $750 $— $750 $— $8,050 $9,550 Note purchase agreements 640 478 200 350 466 1,189 3,323 Credit Agreement — — — — — — — Premium Financing Debt Facility 226 — — — — — 226 Interest on debt 612 593 539 528 473 6,117 8,862 Total debt obligations 1,478 1,821 739 1,628 939 15,356 21,961 Operating lease obligations 173 148 111 84 73 184 773 Less sublease arrangements (3) (2) (2) (2) — — (9) Outstanding purchase obligations 278 227 101 50 26 42 724 Total contractual obligations $1,926 $2,194 $949 $1,760 $1,038 $15,582 $23,449 The amounts presented in the table above may not necessarily reflect our actual future cash funding requirements, because the actual timing of the future payments made may vary from the stated contractual obligation. 109

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Senior Notes, Note Purchase Agreements, Credit Agreement and Premium Financing Debt Facility - See Note 7 to these consolidated financial statements for a summary the amounts outstanding under the Senior Notes, Note purchase agreements, the Credit Agreement and Premium Financing Debt Facility. Operating Lease Obligations - Our corporate segment's executive offices and certain subsidiary and branch facilities of our brokerage and risk management segments are located in a building we own at 2850 Golf Road, Rolling Meadows, Illinois, where we have approximately 360,000 square feet of space and can accommodate approximately 2,000 employees. Relating to the development of our corporate headquarters, we expect to receive property tax related credits under a tax- increment financing note from Rolling Meadows and an Illinois state Economic Development for a Growing Economy (which we refer to as EDGE) tax credit. Since inception in 2017 through 2025, we have earned approximately $75 million of Edge credits, with fiscal year 2025 representing the final year of EDGE credit generation. We generally operate in leased premises at our other locations. Certain of these leases have options permitting renewals for additional periods. In addition to minimum fixed rentals, a number of leases contain annual escalation clauses which are generally related to increases in an inflation index. Total rent expense, including rent relating to cancelable leases and leases with initial terms of less than one year, amounted to $208 million in 2025, $183 million in 2024 and $184 million in 2023. We have leased certain office space to several non-affiliated tenants under operating sublease arrangements. In the normal course of business, we expect that certain of these leases will not be renewed or replaced. We adjust charges for real estate taxes and common area maintenance annually based on actual expenses, and we recognize the related revenues in the year in which the expenses are incurred. These amounts are not included in the minimum future rentals to be received in the contractual obligations table above. Outstanding Purchase Obligations - We typically do not have a material amount of outstanding purchase obligations at any point in time. The amount disclosed in the contractual obligations table above represents the aggregate amount of unrecorded purchase obligations that we had outstanding at December 31, 2025. These obligations represent agreements to purchase goods or services that were executed in the normal course of business. Off-Balance Sheet Commitments - Our total unrecorded commitments associated with outstanding letters of credit, financial guarantees and funding commitments at December 31, 2025 were as follows (in millions): Amount of Commitment Expiration by Period Total Amounts CommittedOff-Balance Sheet Commitments 2026 2027 2028 2029 2030 Thereafter Letters of credit $— $— $— $— $— $14 $14 Financial guarantees — — — — — 50 50 Total commitments $— $— $— $— $— $64 $64 Since commitments may expire unused, the amounts presented in the table above do not necessarily reflect our actual future cash funding requirements. See the Off-Balance Sheet Debt section below for a discussion of letters of credit. All of the letters of credit represent multiple year commitments that have annual, automatic renewing provisions and are classified by the latest commitment date. Substantially all of the purchase agreements related to these acquisitions we do contain provisions for potential earnout obligations. For all of our acquisitions made in the period from 2022 to 2025 that contain potential earnout obligations, such obligations are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration for the respective acquisition. The amounts recorded as earnout payables are primarily based upon estimated future potential operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date. The aggregate amount of the maximum earnout obligations related to these acquisitions was $1,518 million, of which $773 million was recorded in our consolidated balance sheet as of December 31, 2025 based on the estimated fair value of the expected future payments to be made, of which approximately $535 million can be settled in cash or common stock at our option and $238 million must be settled in cash. Off-Balance Sheet Debt - Our unconsolidated investment portfolio includes investments in enterprises where our ownership interest is between 1% and 50%, in which management has determined that our level of influence and economic 110

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interest is not sufficient to require consolidation. As a result, these investments are accounted for under the equity method. None of these unconsolidated investments had any outstanding debt at December 31, 2025 and 2024 that was recourse to us. At December 31, 2025, we had posted one letter of credit related to our self-insurance deductibles, for which we had a recorded liability of $11 million. We have an equity investment in a rent-a-captive facility, which we use as a placement facility for certain of our insurance brokerage operations. At December 31, 2025, we had posted eleven letters of credit totaling $13 million to allow certain of our captive operations to meet minimum statutory surplus requirements plus additional collateral related to premium and claim funds held in a fiduciary capacity and one letter of credit totaling $1 million for collateral related to claim funds held in a fiduciary capacity by a recent acquisition. These letters of credit have never been drawn upon. Our commitments associated with outstanding letters of credit, financial guarantees and funding commitments at December 31, 2025 were as follows (all dollar amounts in table are in millions): Description, Purpose and Trigger Collateral Compensation to Us Maximum Exposure Liability Recorded Credit support under letters of credit (LOC) for deductibles due by us on our own insurance coverages - expires 2028 None None $— $11 Trigger - We do not reimburse the insurance companies for deductibles the insurance companies advance on our behalf Credit enhancement under letters of credit for our captive insurance operations to meet minimum statutory capital requirements - expires 2028 None Reimbursement of LOC fees 13 — Trigger - Dissolution or catastrophic financial results of the operation Collateral related to claims funds held in a fiduciary capacity by a recent acquisition - expires 2028 None None 1 — Trigger - Claim payments are not made $14 $11 (1) The guarantees are collateralized by shares in minority holdings of our Canadian operating companies. Since commitments may expire unused, the amounts presented in the table above do not necessarily reflect our actual future cash funding requirements. Litigation, Regulatory and Taxation Matters - We routinely are involved in legal proceedings, claims, disputes, regulatory matters and governmental inspections or investigations arising in the ordinary course of or incidental to our business, including relating errors and omissions (which we refer to as E&O) claims and those noted below in this section. We record accruals in the consolidated financial statements for pending litigation when we determine that an unfavorable outcome is probable and the amount of the loss can be reasonably estimated. For the matters we disclose that do not include an estimate of the amount of loss or range of losses, such an estimate is not possible or is immaterial, and we may be unable to estimate the possible loss or range of losses that could potentially result from the application of non-monetary remedies, unless disclosed below. We currently believe that the ultimate outcome of these proceedings, individually and in the aggregate, will not materially harm our financial position, results of operations or cash flows. However, legal proceedings and government investigations are subject to inherent uncertainties, and unfavorable rulings or other adverse events could occur, including the payment of substantial monetary damages or an injunction or other order prohibiting us from selling one or more products at all or in particular ways, precluding particular business practices or requiring other remedies, which may result in a material adverse impact on our business, results of operations or financial position. As previously disclosed, our IRC 831(b) (or "micro-captive") advisory services businesses has been under a promoter investigation by the IRS since 2013. Among other matters, the IRS is investigating whether we have been acting as a tax 111

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shelter promoter in connection with these operations. Additionally, the IRS is conducting a criminal investigation related to IRC 831(b) micro-captive underwriting enterprises. We have been advised that we are not a target of the criminal investigation. We are fully cooperating with both matters. Contingent Liabilities - We purchase insurance to provide protection from E&O claims that may arise during the ordinary course of business. Currently we retain the first $15 million of each and every E&O claim. In addition, we retain, in aggregate up to another $2 million between $15 million and $100 million, plus up to another $10 million between $100 million and $200 million, and up to another $20 million between $200 million and $400 million. We have historically maintained self-insurance reserves for the portion of our E&O exposure that is not insured. We periodically determine a range of possible reserve levels using actuarial techniques that rely heavily on projecting historical claim data into the future. Our E&O reserve in the December 31, 2025 consolidated balance sheet is above the lower end of the most recently determined actuarial range by $8 million and below the upper end of the actuarial range by $9 million. We can make no assurances that the historical claim data used to project the current reserve levels will be indicative of future claim activity. Thus, the E&O reserve level and corresponding actuarial range could change in the future as more information becomes known, which could materially impact the amounts reported and disclosed herein. 16. Income Taxes We and our principal domestic subsidiaries are included in a consolidated U.S. federal income tax return. Our international subsidiaries file various income tax returns in their jurisdictions. Significant components of earnings before income taxes and the provision for income taxes are as follows (in millions): Year Ended December 31, 2025 2024 2023 Earnings before income taxes: United States $1,211 $972 $605 Foreign, principally Australia, Canada, New Zealand and the U.K. 660 903 580 Total earnings before income taxes $1,871 $1,875 $1,185 Provision for income taxes: Federal: Current $39 $38 $(22) Deferred 94 112 113 133 150 91 State and local: Current 42 53 (15) Deferred (8) (1) 43 34 52 28 Foreign: Current 224 194 213 Deferred (23) 8 (113) 201 202 100 Provision for income taxes $368 $404 $219 In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures ("ASU 2023-09"), which requires a company to disclose specified additional information in its income tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. ASU 2023-09 also requires the company to disaggregate its income taxes paid disclosure by federal, state and foreign taxes, with further disaggregation required for significant individual jurisdictions 112

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We have adopted ASU 2023-09 using a prospective transition method. A reconciliation of the provision for income taxes with the U.S. federal statutory income tax rate is as follows (in millions, except percentages): Year Ended December 31, 2025 Amount % of Pretax Earnings U.S. federal statutory income tax $393 21.0 % Domestic federal: Tax credits (19) (1.0) Non taxable / nondeductible items Excess tax benefits on share-based payments (77) (4.1) Nondeductible executive compensation (IRC 162(m)) 24 1.3 Other 5 0.3 Cross-border tax laws Income (loss) from branches / disregarded entities (1) (57) (3.1) Other 16 0.9 Changes in valuation allowance (2) 41 2.2 Other (2) (51) (2.7) Domestic state and local income taxes, net of federal benefits \* 25 1.3 Foreign tax effects: U.K.: Nontaxable / nondeductible items Earnout liability adjustments 22 1.2 Other 37 2.0 Other foreign jurisdiction (3) 1 0.1 Changes in unrecognized tax benefits 8 0.4 Provision for income taxes $368 19.7 % (1) Includes foreign tax credit benefits of $33 million. (2) In 2025, we completed the sale of the Pronto Group that resulted in a $40 million U.S. federal capital loss. A valuation allowance was recorded against the related deferred tax asset; therefore, no income tax benefit was recognized, and deferred tax assets associated with the transaction were written off. (3) We have determined that none of the remaining foreign jurisdictions for which there are foreign tax effects reconciling items meet the 5% threshold in any of the years presented. \* In 2025, state and local income taxes in California, New York, Pennsylvania, Florida and New Jersey comprised the majority of the state and local income taxes, net of federal effect category. 113

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The following is a reconciliation of the U.S. federal statutory income tax rate to our effective rate for the years 2024 and 2023 in accordance with the guidance prior to the adoption of ASU 2023-09 (in millions, except percentages): Year Ended December 31, 2024 2023 Amount % of Pretax Earnings Amount % of Pretax Earnings Federal statutory rate $394 21.0 % $249 21.0 % State income taxes - net of federal benefit 61 3.3 50 4.2 Differences related to non U.S. operations (14) (0.7) (21) (1.7) Alternative energy and other tax credits (9) (0.5) (8) (0.7) Other permanent differences 43 2.3 27 2.3 Stock-based compensation (89) (4.7) (76) (6.4) Changes in unrecognized tax benefits 7 0.4 12 1.0 Change in valuation allowance 10 0.5 4 0.3 Change in tax rates 1 — (18) (1.5) Provision for income taxes $404 21.6 % $219 18.5 % A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows (in millions): December 31, 2025 2024 Gross unrecognized tax benefits at January 1 $25 $25 Increases in tax positions for current year 5 1 Settlements — (3) Lapse in statute of limitations (1) (5) Increases in tax positions for prior years 1 17 Decreases in tax positions for prior years — (10) Gross unrecognized tax benefits at December 31 $30 $25 The total amount of net unrecognized tax benefits that, if recognized, would affect the effective tax rate was $30 million and $25 million at December 31, 2025 and 2024, respectively. We accrue interest and penalties related to unrecognized tax benefits in our provision for income taxes. At December 31, 2025 and 2024, we had accrued interest and penalties related to unrecognized tax benefits of $14 million and $10 million, respectively. We file income tax returns in the U.S. and in various state, local and foreign jurisdictions. We are routinely examined by tax authorities in these jurisdictions. At December 31, 2025, our corporate returns had been examined by the IRS or the statute had lapsed through calendar year 2021. The IRS is currently examining the Company's U.S. federal income tax return for the tax year ended December 31, 2022. The examination remains ongoing. In addition, from 2021 forward, various state and foreign jurisdictions remain open. 114

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Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax assets and liabilities are as follows (in millions): December 31, 2025 2024 Deferred tax assets: Tax credit carryforwards $713 $772 Accrued and unfunded compensation and employee benefits 494 356 Amortizable intangible assets 560 177 Compensation expense related to equity plans 113 97 Accrued liabilities 176 126 Depreciable fixed assets — 22 Net operating loss carryforwards 270 163 Capital loss carryforwards 56 8 Interest expense limitation 174 2 Lease liabilities 166 106 Revenue recognition — 5 Other 7 3 Total deferred tax assets 2,729 1,837 Valuation allowance for deferred tax assets (264) (177) Deferred tax assets 2,465 1,660 Deferred tax liabilities: Nondeductible amortizable intangible assets 2,372 647 Accrued pension liability 2 9 Depreciable fixed assets 22 — Right-of-use assets 154 97 Hedging instruments 34 36 Other prepaid items 30 16 Revenue recognition 124 — Other 4 2 Total deferred tax liabilities 2,742 807 Net deferred tax (liabilities) assets $(277) $853 At December 31, 2025 and 2024, $319 million and $106 million, respectively, of deferred tax liabilities have been included in noncurrent liabilities in the accompanying consolidated balance sheet. General business and other tax credits of $674 million begin to expire, if not utilized, in 2032 and state credits, net of federal benefit, of $40 million, begin to expire, if not utilized in 2026. Net operating loss carryforwards of $270 million, related to federal, state and foreign begin to expire, if not utilized in 2026. We expect the historically favorable trend in earnings before income taxes to continue in the foreseeable future. Valuation allowances have been established for certain foreign intangible assets (including nondeductible amortization and earnout payable expenses) and various state net operating loss carryforwards that may not be utilized in the future. At December 31, 2025, foreign earnings in all jurisdictions are considered indefinitely reinvested offshore. Current U.S. tax law requires U.S. shareholders to include in income certain "global intangible low-taxed income" (which we refer to as GILTI) beginning in 2018. Our policy is to include the GILTI income in the future period when the tax arises and we recorded income tax expense on such income in 2025, 2024 and 2023. Current U.S. tax law includes the U.S. Base Erosion and Anti-Abuse Tax (which we refer to as BEAT) beginning in 2018. Based on our analysis, we determined that our base erosion payments do not exceed the threshold for applicability for the years in 2025, 2024 and 2023, and we do 115

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not currently anticipate any significant long-term impact from the BEAT in our provision for income taxes in future periods. 17. Supplemental Disclosures of Cash Flow Information Year ended December 31, Supplemental disclosures of cash flow information (in millions): 2025 2024 2023 Interest paid $575 $347 $271 Income taxes paid, net 341 331 226 Year ended December 31, Income taxes paid (in millions) 2025 Federal $42 State California 19 Other 38 Foreign U.K. 117 Australia 31 New Zealand 26 Other 68 Total foreign 242 Income taxes paid, net $341 The following is a reconciliation of our end of period cash, cash equivalents, restricted cash and fiduciary cash balances as presented in the consolidated statement of cash flows for the years ended December 31, 2025, 2024 and 2023 (in millions): December 31, 2025 2024 2023 Cash and cash equivalents - non-restricted cash $1,155 $14,759 $781 Cash and cash equivalents - restricted cash 241 228 190 Total cash and cash equivalents $1,396 $14,987 $971 Fiduciary cash 7,142 5,481 5,572 Total cash, cash equivalents, restricted cash and fiduciary cash $8,538 $20,468 $6,543 Total cash and cash equivalents, restricted cash and fiduciary cash at December 31, 2025 and December 31, 2024, include $2,916 million and $15,372 million, respectively, of income earning money market accounts. The decrease in cash invested in money market accounts between years is primarily due to the proceeds received from the AssuredPartners Financing ($13.5 billion) and proceeds received in January 2025 from the exercise by the underwriters of the overallotment provision related to the follow-on-common stock offering ($1.3 billion) which was used to fund the acquisition of AssuredPartners that closed on August 18, 2025. Refer to Note 3 for more information regarding the AssuredPartners Financing. The dividend income on money market accounts was recorded in interest income, premium finance and other income in our consolidated statement of earnings, which increased $296 million during 2025 ($363 million of which related to the proceeds from the AssuredPartners financing) to $769 million for the year ended December 31, 2025 compared to $473 million for the year ended December 31, 2024. We have a qualified contributory savings and thrift 401(k) plan covering the majority of our domestic employees. For eligible employees who have met the plan's age and service requirements to receive matching contributions, we historically have matched 100% of pre-tax and Roth elective deferrals up to a maximum of 5% of eligible compensation, subject to federal limits on plan contributions and not in excess of the maximum amount deductible for federal income tax purposes. Beginning in 2021, the amount matched by the Company will be discretionary and annually determined by management. 116

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Employees must be employed and eligible for the plan on the last day of the plan year to receive a matching contribution, subject to certain exceptions enumerated in the plan document. Matching contributions are subject to a five-year graduated vesting schedule and can be funded in cash or the common stock of the Company. We expensed (net of plan forfeitures) $115 million, $105 million and $86 million related to the plan in 2025, 2024 and 2023, respectively. During 2024, management determined the 5% employer matching contributions on eligible compensation to the 401(k) plan for the 2024 plan year to be funded with our common stock, which was funded in February 2025. During 2025, management determined the 5% employer matching contributions on eligible compensation to the 401(k) plan for the 2025 plan year to be funded with our common stock, which is expected to be funded in February 2026. 18. Accumulated Other Comprehensive Loss The after-tax components of our accumulated comprehensive loss attributable to controlling interests consist of the following (in millions): Pension Liability Foreign Currency Translation Fair Value of Derivative Instruments Accumulated Comprehensive Loss Balance as of January 1, 2022 $(49) $(1,125) $34 $(1,140) Net change in period 12 258 78 348 Balance as of December 31, 2023 (37) (867) 112 (792) Net change in period 14 (365) (8) (359) Balance as of December 31, 2024 (23) (1,232) 104 (1,151) Net change in period — 630 (4) 626 Balance as of December 31, 2025 $(23) $(602) $100 $(525) The foreign currency translation in 2025, 2024 and 2023 relates to the net impact of changes in the value of the local currencies relative to the U.S. dollar for our operations in Australia, Canada, the Caribbean, India, New Zealand, the U.K. and other non-U.S. locations. The reporting currency for our financial statements is the U.S. dollar. Certain of our assets, liabilities, expenses and revenues are denominated in currencies other than the U.S. dollar, primarily the Australian dollar, British pound, Canadian dollar, and New Zealand dollar. To prepare our consolidated financial statements, we must translate those assets, liabilities, expenses and revenues into U.S. dollars at the applicable exchange rates. Assets and liabilities of non-U.S. dollar functional currency operations are translated into U.S. dollars at end-of-period exchange rates while revenues, expenses and cash flows are translated at average monthly exchange rates over the period. Equity is translated at historical exchange rates and the resulting cumulative translation adjustments are included as a component of accumulated other comprehensive loss in the consolidated balance sheet. The net change in the foreign currency translation during 2025 primarily relates to goodwill (see Note 6 to these consolidated financial statements for the impact on goodwill) and amortizable intangible assets held by operations with a non-U.S. dollar functional currency. During 2025, 2024 and 2023, $16 million of expense, $7 million of expense and $3 million of expense, respectively, related to the fair value of derivative investments, was reclassified from accumulated other comprehensive loss to the statement of earnings. During 2025, 2024 and 2023, no amounts related to foreign currency translation were reclassified from accumulated other comprehensive loss to the statement of earnings. 19. Segment Information We have three reportable segments: brokerage, risk management and corporate. The brokerage segment is primarily comprised of our retail and wholesale insurance and reinsurance brokerage operations. The brokerage segment (which comprises our retail property/casualty, wholesale, reinsurance, benefits and captive operations) generates revenues through commissions paid by underwriting enterprises and through fees charged to our clients. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients and we do not assume net underwriting risks. The risk management segment provides contract claim settlement and administration services for commercial, nonprofit, captive and public sector entities, and various organizations that choose to self-insure some or all of their property/casualty coverages and for underwriting enterprises that choose to outsource some or all of their property/casualty claims departments. These operations also provide claims management, loss control consulting and insurance property appraisal 117

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services. Revenues are principally generated on a negotiated per-claim or per-service fee basis. Our risk management segment also provides risk management consulting services that are recognized as the services are delivered. Revenues in the corporate segment consist of other income related to the run-off of legacy investments. In addition, the corporate segment reports the financial information related to our debt, external acquisition-related expenses, other corporate costs, the impact of foreign currency remeasurement and clean energy investments. Allocations of investment income and certain expenses are based on reasonable assumptions and estimates primarily using revenue, headcount and other information. We allocate the provision for income taxes to the brokerage and risk management segments using the local country statutory rates. Reported operating results by segment would change if different methods were applied. Our Chief Operating Decision Maker (which we refer to as CODM) who is our Chairman and Chief Executive Officer, analyzes and evaluates the operating performance of the three reportable segments presented below. We have disclosed for each reportable segment the significant expense categories that are reviewed by the CODM and there are no additional significant expenses within the expense categories presented in the tables below. The key areas of focus by the CODM for allocation of resources are revenues from each reportable segment, as well as their compensation and operating expenses. 118

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Financial information relating to our segments for 2025, 2024 and 2023 is as follows (in millions): Year Ended December 31, 2025 Brokerage Risk Management Corporate Total Revenues: Commissions $8,024 $— $— $8,024 Fees 2,646 1,549 — 4,195 Supplemental revenues 466 — — 466 Contingent revenues 324 — — 324 Interest income, premium finance revenues and other income 732 36 1 769 Revenues before reimbursements 12,192 1,585 1 13,778 Reimbursements — 164 — 164 Total revenues 12,192 1,749 1 13,942 Compensation 6,660 974 208 7,842 Operating 1,676 298 284 2,258 Reimbursements — 164 — 164 Interest — — 639 639 Depreciation 159 40 7 206 Amortization 894 22 — 916 Change in estimated acquisition earnout payables 44 2 — 46 Total expenses 9,433 1,500 1,138 12,071 Earnings (loss) before income taxes 2,759 249 (1,137) 1,871 Provision (benefit) for income taxes 707 66 (405) 368 Net earnings (loss) 2,052 183 (732) 1,503 Net earnings (loss) attributable to noncontrolling interests 9 — — 9 Net earnings (loss) attributable to controlling interests $2,043 $183 $(732) $1,494 Net foreign exchange (loss) $(5) $(1) $(48) $(54) Revenues: United States $8,003 $1,387 $1 $9,391 United Kingdom 2,372 105 — 2,477 Australia 344 242 — 586 Canada 387 8 — 395 New Zealand 207 — — 207 Other foreign 879 7 — 886 Total revenues $12,192 $1,749 $1 $13,942 At December 31, 2025 Identifiable assets: United States $25,203 $1,335 $16,701 $43,239 United Kingdom 15,161 443 — 15,604 Australia 1,919 460 — 2,379 Canada 1,731 9 — 1,740 New Zealand 776 8 — 784 Other foreign 6,755 19 145 6,919 Total identifiable assets $51,545 $2,274 $16,846 $70,665 Goodwill - net $22,078 $497 $18 $22,593 Amortizable intangible assets - net 10,483 201 — 10,684 119

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Year Ended December 31, 2024 Brokerage Risk Management Corporate Total Revenues: Commissions $6,694 $— $— $6,694 Fees 2,193 1,414 — 3,607 Supplemental revenues 359 — — 359 Contingent revenues 268 — — 268 Interest income, premium finance revenues and other income 420 37 16 473 Revenues before reimbursements 9,934 1,451 16 11,401 Reimbursements — 154 — 154 Total revenues 9,934 1,605 16 11,555 Compensation 5,502 882 138 6,522 Operating 1,363 279 112 1,754 Reimbursements — 154 — 154 Interest — — 381 381 Depreciation 133 38 7 178 Amortization 651 14 — 665 Change in estimated acquisition earnout payables 26 — — 26 Total expenses 7,675 1,367 638 9,680 Earnings (loss) before income taxes 2,259 238 (622) 1,875 Provision (benefit) for income taxes 573 63 (232) 404 Net earnings (loss) 1,686 175 (390) 1,471 Net earnings (loss) attributable to noncontrolling interests 8 — — 8 Net earnings (loss) attributable to controlling interests $1,678 $175 $(390) $1,463 Net foreign exchange gain (loss) $1 $— $(1) $— Revenues: United States $6,104 $1,308 $16 $7,428 United Kingdom 2,168 57 — 2,225 Australia 349 226 — 575 Canada 409 7 — 416 New Zealand 203 7 — 210 Other foreign 701 — — 701 Total revenues $9,934 $1,605 $16 $11,555 At December 31, 2024 Identifiable assets: United States $20,910 $1,110 $16,029 $38,049 United Kingdom 16,051 150 — 16,201 Australia 1,767 382 — 2,149 Canada 1,684 6 — 1,690 New Zealand 719 14 — 733 Other foreign 5,308 — 125 5,433 Total identifiable assets $46,439 $1,662 $16,154 $64,255 Goodwill - net $11,923 $328 $19 $12,270 Amortizable intangible assets - net 4,413 117 — 4,530 120

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Year Ended December 31, 2023 Brokerage Risk Management Corporate Total Revenues: Commissions $5,865 $— $— $5,865 Fees 1,885 1,260 — 3,145 Supplemental revenues 314 — — 314 Contingent revenues 235 — — 235 Interest income, premium finance revenues and other income 338 28 2 368 Revenues before reimbursements 8,637 1,288 2 9,927 Reimbursements — 145 — 145 Total revenues 8,637 1,433 2 10,072 Compensation 4,769 777 135 5,681 Operating 1,272 257 160 1,689 Reimbursements — 145 — 145 Interest — — 297 297 Depreciation 124 36 5 165 Amortization 524 8 — 532 Change in estimated acquisition earnout payables 377 1 — 378 Total expenses 7,066 1,224 597 8,887 Earnings (loss) before income taxes 1,571 209 (595) 1,185 Provision (benefit) for income taxes 402 55 (238) 219 Net earnings (loss) 1,169 154 (357) 966 Net earnings (loss) attributable to noncontrolling interests 6 — (10) (4) Net earnings (loss) attributable to controlling interests $1,163 $154 $(347) $970 Net foreign exchange (loss) $— $(10) $— $(10) Revenues: United States $5,216 $1,209 $2 $6,427 United Kingdom 1,946 47 — 1,993 Australia 312 155 — 467 Canada 398 6 — 404 New Zealand 192 16 — 208 Other foreign 573 — — 573 Total revenues $8,637 $1,433 $2 $10,072 At December 31, 2023 Identifiable assets: United States $21,764 $1,026 $2,521 $25,311 United Kingdom 16,000 130 — 16,130 Australia 1,969 469 — 2,438 Canada 1,693 4 — 1,697 New Zealand 773 20 — 793 Other foreign 5,247 — — 5,247 Total identifiable assets $47,446 $1,649 $2,521 $51,616 Goodwill - net $11,218 $239 $19 $11,476 Amortizable intangible assets - net 4,428 205 — 4,633 121

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Report of Independent Registered Public Accounting Firm To the Stockholders and the Board of Directors of Arthur J. Gallagher & Co. Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of Arthur J. Gallagher & Co. (the Company) as of December 31, 2025 and 2024, the related consolidated statements of earnings, comprehensive earnings, stockholders' equity and cash flows for each of the three years in the period ended December 31, 2025, the related notes and the financial statement schedule listed in the Index at Item 15(2)(a) (collectively referred to as the "consolidated financial statements"). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2025, 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, 2025, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 17, 2026 expressed an unqualified opinion thereon. Basis for Opinion These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's 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 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 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 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 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 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 financial statements and (2) involved our especially challenging, subjective or complex judgments. The communication of the 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. 122

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Business acquisitions - valuation of acquired expiration lists Description of the Matter As described in Note 3 to the consolidated financial statements, the Company completed 33 acquisitions during 2025 for total net consideration of $16,348 million. All the acquisitions have been accounted for using the acquisition method for recording business combinations. The excess of the purchase price over the estimated fair value of the net assets acquired, including identifiable intangible assets, at the acquisitions date was allocated to goodwill. Identifiable intangible assets from the acquisitions consists primarily of acquired expiration lists of $7,020 million. Provisional estimates of fair value are established on the closing date of each acquisition and are subsequently reviewed and finalized within twelve months of the acquisition date. Auditing the accounting for these acquisitions involved subjectivity in evaluating management's estimates, specifically, the identification and measurement of expiration lists. The Company, with the assistance of a third-party valuation firm, as applicable, used the excess earnings method to measure the fair value of the expiration lists to finalize the accounting for its acquisitions. The significant assumptions used to estimate the fair value of the expiration lists included, attrition rates, and discount rates. These assumptions are forward-looking and could be affected by future economic and market conditions. How We Addressed the Matter in Our Audit We obtained an understanding, evaluated the design and tested the operating effectiveness of the controls over management's review of significant assumptions used to determine the fair value of expiration lists of the acquisitions for which management finalized its accounting. For select acquisitions, to test the estimated fair value of expiration lists, our audit procedures included, among other things, testing the significant assumptions, including, attrition rates, and discount rates, used to value the expiration lists for acquisitions that the Company has deemed the accounting as final. We have also tested the completeness and accuracy of the underlying data supporting the fair value estimates and compared the above assumptions to the historical results of the acquired companies, past performance of similar acquisitions by the Company, and current market conditions. For select acquisitions, we utilized the assistance of our valuation specialists to evaluate the methods and assumptions used to determine the fair value of expiration lists. /s/ Ernst & Young LLP Ernst & Young LLP We have served as the Company's auditor since 1973 Chicago, Illinois February 17, 2026 123

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Management's Report on Internal Control Over Financial Reporting Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Rules 13a-15(f) under the Exchange Act. Under the supervision and with the participation of management, including our principal executive officer and principal financial officer, we conducted an assessment of the effectiveness of our internal control over financial reporting based on the framework in Internal Control – Integrated Frame work issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework). In conducting our assessment of the effectiveness of its internal control over financial reporting, we have excluded 14 of the 33 entities acquired in 2025, which are included in our 2025 consolidated financial statements. Collectively, these acquired entities constituted approximately 6.6% of total assets as of December 31, 2025, approximately 7.7% of total revenues, and approximately (1.0)% of net earnings for the year then ended. Based on our assessment under the 2013 framework, management concluded that our internal control over financial reporting was effective as of December 31, 2025. In addition, the effectiveness of our internal control over financial reporting as of December 31, 2025, has been audited by Ernst & Young LLP, an independent registered public accounting firm, as stated in their attestation report which is included herein. Arthur J. Gallagher & Co. Rolling Meadows, Illinois February 17, 2026 /s/ J. Patrick Gallagher, Jr. /s/ Douglas K. Howell J. Patrick Gallagher, Jr. Chairman and Chief Executive Officer Douglas K. Howell Chief Financial Officer 124

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Report of Independent Registered Public Accounting Firm To the Stockholders and the Board of Directors of Arthur J. Gallagher & Co. Opinion on Internal Control Over Financial Reporting We have audited Arthur J. Gallagher & Co.'s internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), (the COSO criteria). In our opinion, Arthur J. Gallagher & Co (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2025, based on the COSO criteria. As indicated in the accompanying Management's Report on Internal Control Over Financial Reporting, management's assessment of and conclusion on the effectiveness of internal control over financial reporting did not include the internal controls of 14 of the 33 entities acquired in 2025, which are included in the 2025 consolidated financial statements of the Company and constituted approximately 6.6% of total assets as of December 31, 2025, approximately 7.7% of total revenues, and approximately (1.0)% of net earnings for the year then ended. Our audit of internal control over financial reporting of the Company also did not include an evaluation of the internal control over financial reporting of these acquired entities. 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, 2025 and 2024, the related consolidated statements of earnings, comprehensive earnings, stockholders' equity and cash flows for each of the three years in the period ended December 31, 2025, and the related notes and financial statement schedule listed in the Index at Item 15(2)(a) and our report dated February 17, 2026 expressed an unqualified opinion thereon. 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 included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and 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. 125

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/s/ Ernst & Young LLP Ernst & Young LLP Chicago, Illinois February 17, 2026 126

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Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure. There were no changes in or disagreements with our accountants on matters related to accounting and financial disclosure. Item 9A. Controls and Procedures. Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures. We carried out an evaluation required by the Exchange Act, under the supervision and with the participation of our principal executive officer and principal financial officer, of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rule 13a-15(e) of the 1934 Act, as of the end of the period covered by this report. Based on this evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the 1934 Act is recorded, processed, summarized, and reported within the time periods specified in the SEC's rules and forms and to provide reasonable assurance that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure. Design and Evaluation of Internal Control over Financial Reporting. Our disclosure controls and procedures are designed to provide reasonable assurance of achieving their objectives as specified above. Management does not expect, however, that our disclosure controls and procedures will prevent or detect all error and fraud. Any control system, no matter how well designed and operated, is based upon certain assumptions and can provide only reasonable, not absolute, assurance that its objectives will be met. Further, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and instances of fraud, if any, within the Company have been detected. Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, we included a report of management's assessment of the design and effectiveness of our internal controls as part of this annual report for the fiscal year ended December 31, 2025. Our independent registered public accounting firm also attested to, and reported on, the effectiveness of internal control over financial reporting. Management's report and the independent registered public accounting firm's attestation report are included in Item 8, "Financial Statements and Supplementary Data," under the captions entitled "Management's Report on Internal Control Over Financial Reporting" and "Report of Independent Registered Public Accounting Firm on Internal Control Over Financial Reporting." Changes in Internal Control over Financial Reporting. During the three-month period ended December 31, 2025, there has not occurred any change in our internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting. Item 9B. Other Information. During the three-month period ended December 31, 2025, no director or officer adopted or terminated any Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement, as each term is defined in Item 408(a) of Regulation S-K. Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections. None. 127

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Part III Item 10. Directors, Executive Officers and Corporate Governance. Our 2026 Proxy Statement will include the information required by this item under the headings "Election of Directors," "Other Board Matters," "Board Committees," "Insider Trading Policy" and, if necessary, "Delinquent Section 16(a) Reports," which we incorporate herein by reference. Item 11. Executive Compensation. Our 2026 Proxy Statement will include the information required by this item under the headings "Compensation Committee Report" and "Compensation Discussion and Analysis," which we incorporate herein by reference. Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters. Our 2026 Proxy Statement will include the information required by this item under the headings "Security Ownership by Certain Beneficial Owners and Management" and "Equity Compensation Plan Information," which we incorporate herein by reference. Item 13. Certain Relationships and Related Transactions, and Director Independence. Our 2026 Proxy Statement will include the information required by this item under the headings "Certain Relationships and Related Transactions" and "Other Board Matters," which we incorporate herein by reference. Item 14. Principal Accountant Fees and Services. Our independent registered public accounting firm is Ernst & Young LLP, Chicago, Illinois, Auditor Firm ID: 42. Our 2026 Proxy Statement will include the information required by this item under the heading "Ratification of Appointment of Independent Auditor - Principal Accountant Fees and Services," which we incorporate herein by reference. Part IV Item 15. Exhibits and Financial Statement Schedules. The following documents are filed as a part of this report: 1. Consolidated Financial Statements: (a) Consolidated Statement of Earnings for each of the three years in the period ended December 31, 2025. (b) Consolidated Balance Sheet as of December 31, 2025 and 2024. (c) Consolidated Statement of Cash Flows for each of the three years in the period ended December 31, 2025. (d) Consolidated Statement of Stockholders' Equity for each of the three years in the period ended December 31, 2025. (e) Notes to Consolidated Financial Statements. (f) Report of Independent Registered Public Accounting Firm on Financial Statements. (g) Management's Report on Internal Control Over Financial Reporting. (h) Report of Independent Registered Public Accounting Firm on Internal Control Over Financial Reporting. 2. Consolidated Financial Statement Schedules required to be filed by Item 8 of this Form: (a) Schedule II - Valuation and Qualifying Accounts. All other schedules are omitted because they are not applicable, or not required, or because the required information is included in our consolidated financial statements or the notes thereto. Exhibits: 128

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2.1 Stock Purchase Agreement, dated as of December 7, 2024, by and among Arthur J. Gallagher & Co., The AssuredPartners Group LP and Dolphin TopCo, Inc. (incorporated by reference to Exhibit 2.1 to our Form 8-K Current Report dated December 7, 2024, File No. 1-09761). 3.1 Restated Certificate of Incorporation of Arthur J. Gallagher & Co. (incorporated by reference to Exhibit 3.2 to our Form 8-K Current Report dated May 11, 2023, File No. 1-09761). 3.2 Amended and Restated By-Laws of Arthur J. Gallagher & Co (incorporated by reference to Exhibit 3.1 to our Form 8-K Current Report dated January 29, 2025, File No. 1-09761). 4.1 Description of Securities (incorporated by reference to Exhibit 4.1 to our Form 10-K Annual Report for 2023, File No. 1-09761) 4.2 Indenture, dated as of May 20, 2021, between the Company and The Bank of New York Mellon Trust Company, N.A., as Trustee (incorporated by reference to Exhibit 4.1 to our Form 8-K Current Report dated May 20, 2021, File No. 1-09761). 10.1 Amended and Restated Credit Agreement, dated as of April 3, 2025, by and among Arthur J. Gallagher & Co., as borrower, Bank of America, N.A., as administrative agent, L/C issuer and swing line lender, and the lenders and other L/C issuers party thereto. (incorporated by reference to Exhibit 10.1 to our Form 8-K Current Report dated April 3, 2025, File No 001-09761). \*10.2 Form of Indemnity Agreement between Arthur J. Gallagher & Co. and each of our directors and executive officers (incorporated by reference to Exhibit 10.3 to our Form 10-K Annual Report for 2024, File No. 1-09761). \*10.3 Arthur J. Gallagher & Co. Deferral Plan for Nonemployee Directors (amended and restated as of February 1, 2022) (incorporated by reference to Exhibit 10.12 to our Form 10-K Annual Report for 2022, File No. 1-09761). \*10.4 Form of Change in Control Agreement between Arthur J. Gallagher & Co. and those Executive Officers hired prior to January 1, 2008 (incorporated by reference to Exhibit 10.14.1 to our Form 10-K Annual Report for 2011, File No. 1-09761). \*10.5 Form of Change in Control Agreement between Arthur J. Gallagher & Co. and those Executive Officers hired after January 1, 2008 (incorporated by reference to Exhibit 10.14.2 to our Form 10-K Annual Report for 2011, File No. 1-09761). \*10.6 The Arthur J. Gallagher & Co. Supplemental Savings and Thrift Plan, as amended and restated effective October 20, 2020 (incorporated by reference to Exhibit 10.15 to our Form 10-K Annual Report for 2020, File No. 1-09761). \*10.7 Arthur J. Gallagher & Co., Deferred Equity Participation Plan (as amended and restated as of February 20, 2021) (incorporated by reference to Exhibit 10.16 to our Form 10-Q for the quarterly period ended March 31, 2021 File No. 1 09761). \*10.8 Form of Deferred Equity Participation Plan Award Agreement (incorporated by reference to Exhibit 10.16.1 to our Form 10-K Annual Report for 2022, File No. 1-09761). \*10.9 Arthur J. Gallagher & Co. Severance Plan (effective September 15, 1997, as amended and restated effective January 1, 2009) (incorporated by reference to Exhibit 10.17 to our Form 10-K Annual Report for 2008, File No. 1-09761). \*10.10 First Amendment to the Arthur J. Gallagher & Co. Severance Plan (effective September 15, 1997, as amended and restated effective January 1, 2009) (incorporated by reference to Exhibit 10.1 to our Form 10-Q Quarterly Report for the quarterly period ended June 30, 2010, File No. 1-09761). \*10.11 Arthur J. Gallagher & Co. Deferred Cash Participation Plan, amended and restated as of September 11, 2018 (incorporated by reference to Exhibit 10.18 to our Form 10-K Annual Report for 2019, File No. 1-09761). \*10.12 Form of Long-Term Incentive Plan Restricted Stock Unit Award Agreement (incorporated by reference to Exhibit 10.42.1 to our Form 10-K Annual Report for 2022, File No. 1-09761). \*10.13 Form of Long-Term Incentive Plan Stock Option Award Agreement (incorporated by reference to Exhibit 10.42.2 to our Form 10-K Annual Report for 2022, File No. 1-09761). \*10.14 Form of Long-Term Incentive Plan Stock Appreciation Rights Award Agreement (incorporated by reference to Exhibit 10.42.3 to our Form 10-K Annual Report for 2010, File No. 1-09761). \*10.15 Form of Long-Term Incentive Plan Restricted Stock Unit Award Agreement for executive officers over the age of 55 (incorporated by reference to Exhibit 10.42.4 to our Form 10-K Annual Report for 2022, File No. 1-09761). 129

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\*10.16 Form of Long-Term Incentive Plan Stock Option Award Agreement for executive officers (incorporated by reference to Exhibit 10.17 to our Form 10-K Annual Report for 2023, File No. 1-09761). \*10.17 Arthur J. Gallagher & Co. Performance Unit Program (incorporated by reference to Exhibit 10.43 to our Form 10-Q Quarterly Report for the quarterly period ended June 30, 2007, File No. 1-09761). \*10.18 Form of Performance Unit Grant Agreement under the Performance Unit Program (incorporated by reference to Exhibit 10.43.1 to our Form 10-K Annual Report for 2022, File No. 1-09761). \*10.19 Form of Performance Unit Grant Agreement under the Long-Term Incentive Plan for executive officers (incorporated by reference to Exhibit 10.20 to our Form 10-K Annual Report for 2023, File No. 1-09761). \*10.20 Arthur J. Gallagher & Co. 2017 Long-Term Incentive Plan (incorporated by reference to Exhibit 4.8 to our Form S-8 Registration Statement, File No. 333-221274). \*10.21 Arthur J. Gallagher & Co. U.K. Employee Share Incentive Plan (incorporated by reference to Exhibit 4.3 to our Form S-8 Registration Statement, File No. 333-258331). \*10.22 Form of Partnership Share Agreement under the Arthur J. Gallagher & Co. U.K. Employee Share Incentive Plan (incorporated by reference to Exhibit 4.4 to our Form S-8 Registration Statement, File No. 333-258331). \*10.23 Arthur J. Gallagher & Co. 2022 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to our Form 8-K Current Report dated May 13, 2022 File No. 1-09761). 19 Insider Trading Policy (incorporated by reference to Exhibit 19 to our Form 10-K Annual Report for 2024, File No. 1-09761). 21.1 Subsidiaries of Arthur J. Gallagher & Co., including state or other jurisdiction of incorporation or organization. 23.1 Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm. 24.1 Power of Attorney. 31.1 Rule 13a-14(a) Certification of Chief Executive Officer. 31.2 Rule 13a-14(a) Certification of Chief Financial Officer. 32.1 Section 1350 Certification of Chief Executive Officer. 32.2 Section 1350 Certification of Chief Financial Officer. 97 Incentive Compensation Recovery Policy (incorporated by reference to Exhibit 97 to our Form 10-K Annual Report for 2023, File No. 1-09761). 101.INS Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. 101.SCH Inline XBRL Taxonomy Extension Schema with embedded linkbases document. 104 Cover Page Interactive Data File formatted in Inline XBRL (included as Exhibit 101). All other exhibits are omitted because they are not applicable, or not required, or because the required information is included in our consolidated financial statements or the notes thereto. The registrant agrees to furnish to the Securities and Exchange Commission upon request a copy of any long-term debt instruments that have been omitted pursuant to Item 601(b)(4)(iii)(A) of Regulation S-K. ^ Certain exhibits and schedules have been omitted pursuant to Item 601(b)(2) of Regulation S-K. The Company hereby undertakes to furnish supplemental copies of any of the omitted exhibits and schedules upon request by the SEC; provided, however, that the Company may request confidential treatment pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended, for any exhibits or schedules so furnished. \* Such exhibit is a management contract or compensatory plan or arrangement required to be filed as an exhibit to this form pursuant to item 601 of Regulation S-K. Item 16. Form 10-K Summary. None. 130

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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 on the 17th day of February, 2026. ARTHUR J. GALLAGHER & CO. By /S/ J. PATRICK GALLAGHER, JR. J. Patrick Gallagher, Jr. Chairman and Chief Executive Officer Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below on the 17th day of February, 2026 by the following persons on behalf of the Registrant in the capacities indicated. Name Title /S/ J. PATRICK GALLAGHER, JR. Chairman, Chief Executive Officer and Director (Principal Executive Officer) J. Patrick Gallagher, Jr. /S/ DOUGLAS K. HOWELL Vice President and Chief Financial Officer (Principal Financial Officer) Douglas K. Howell /S/ RICHARD C. CARY Controller (Principal Accounting Officer) Richard C. Cary \*SHERRY BARRAT Director Sherry Barrat \*DEBORAH CAPLAN Director Deborah Caplan \*TERESA CLARKE Director Teresa Clarke \* JOHN COLDMAN Director John Coldman \* RICHARD HARRIES Director Richard Harries Director David Johnson \*CHRIS.MISKEL Director Chris Miskel \* RALPH NICOLETTI Director Ralph Nicoletti \*NORMAN ROSENTHAL Director Norman Rosenthal \*By: /S/ WALTER D. BAY Walter D. Bay, Attorney-in-Fact 131

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&nbsp;&nbsp;&nbsp;&nbsp;Schedule II Arthur J. Gallagher & Co. Valuation and Qualifying Accounts Balance at Beginning of Year Amounts Recorded in Earnings Adjustments Balance at End of Year (In millions) Year ended December 31, 2025 Allowance for credit losses on trade receivables and accounts receivables $22 $15 $12 (1) $49 Allowance for estimated policy cancellations 13 6 4 (2) 23 Valuation allowance for deferred tax assets 177 87 — 264 Accumulated amortization of expiration lists, non-compete agreements and trade names 4,472 916 181 (3) 5,569 Year ended December 31, 2024 Allowance for credit losses on trade receivables and accounts receivables $23 $12 $(13) (1) $22 Allowance for estimated policy cancellations 10 3 — (2) 13 Valuation allowance for deferred tax assets 196 (19) — 177 Accumulated amortization of expiration lists, non-compete agreements and trade names 3,874 665 (67) (3) 4,472 Year ended December 31, 2023 Allowance for credit losses on trade receivables and accounts receivables $11 $26 $(14) (1) $23 Allowance for estimated policy cancellations 9 — 1 (2) 10 Valuation allowance for deferred tax assets 135 61 — 196 Accumulated amortization of expiration lists, non-compete agreements and trade names 3,300 532 42 (3) 3,874 _______________________________________________________________ (1) Net activity of receivable write offs and recoveries and allowances from acquired businesses. (2) Net activity to allowance related to acquired businesses. (3) Elimination of fully amortized expiration lists, non-compete agreements and trade names, intangible asset/ amortization reclassifications and disposal of acquired businesses. 132

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Exhibit 31.1 Rule 13a-14(a) Certification of Chief Executive Officer Certification I, J. Patrick Gallagher, Jr., certify that: 1. I have reviewed this annual report on Form 10-K of Arthur J. Gallagher & Co.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: (a.) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; (b.) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, 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; (c.) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and (d.) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and 5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions): (a.) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and (b.) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting. Date: February 17, 2026 /s/ J. Patrick Gallagher, Jr. J. Patrick Gallagher, Jr. Chairman and Chief Executive Officer (principal executive officer)

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Exhibit 31.2 Rule 13a-14(a) Certification of Chief Financial Officer Certification I, Douglas K. Howell, certify that: 1. I have reviewed this annual report on Form 10-K of Arthur J. Gallagher & Co.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: (a.) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; (b.) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, 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; (c.) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and (d.) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and 5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions): (a.) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and (b.) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting. Date: February 17, 2026 /s/ Douglas K. Howell Douglas K. Howell Vice President Chief Financial Officer (principal financial officer)

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Exhibit 32.1 Section 1350 Certification of Chief Executive Officer I, J. Patrick Gallagher, Jr., the chief executive officer of Arthur J. Gallagher & Co., certify that (i) the Annual Report on Form 10-K of Arthur J. Gallagher & Co. for the twelve month period ended December 31, 2025 (the "Form 10-K") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and (ii) the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of Arthur J. Gallagher & Co. and its subsidiaries. Date: February 17, 2026 /s/ J. Patrick Gallagher, Jr. J. Patrick Gallagher, Jr. Chairman and Chief Executive Officer (principal executive officer)

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Exhibit 32.2 Section 1350 Certification of Chief Financial Officer I, Douglas K. Howell, the chief financial officer of Arthur J. Gallagher & Co., certify that (i) the Annual Report on Form 10-K of Arthur J. Gallagher & Co. for the twelve month period ended December 31, 2025 (the "Form 10-K") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and (ii) the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of Arthur J. Gallagher & Co. and its subsidiaries. Date: February 17, 2026 /s/ Douglas K. Howell Douglas K. Howell Vice President Chief Financial Officer (principal financial officer)

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ANNUAL MEETING The Arthur J. Gallagher & Co. 2026 Annual Meeting of Stockholders will be held on Tuesday, May 12, 2026, at 9 a.m. (Central Time) and will be a virtual meeting. The meeting website is www.virtualshareholdermeeting.com/AJG2026. REGISTRAR AND TRANSFER AGENT Computershare Trust Company, N.A. 150 Royall Street Canton, MA 02021 (877) 373-6374 www.computershare.com/investor AUDITORS Ernst & Young LLP STOCKHOLDER INQUIRIES Communications regarding direct stock purchases, dividends, lost stock certificates, direct deposit of dividends, dividend reinvestment and changes of address should be directed to: Computershare Trust Company, N.A. P.O. Box 43006 Providence, RI 02940 (877) 373-6374 or (312) 360-5386 www.computershare.com/investor Online inquiries: web.queries@computershare.com Stockholder Information $250 Arthur J. Gallagher & Co. S&P 500 Index Peer Group 2020 2021 2022 20242023 2025 $130 $100 $160 $190 $220 Comparison of 5-Year Cumulative Total Return Assumes initial investment of $100 December 2025 COMPARATIVE PERFORMANCE GRAPH The graph above demonstrates a five-year comparison of cumulative total returns for our company, the S&P 500, and a peer group consisting of Aon plc, Marsh & McLennan Companies, Inc., Willis Towers Watson plc and Brown & Brown, Inc. The chart shows the performance of $100 invested in our company, the S&P 500 and the peer group on December 31, 2020, with dividend reinvestment.

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Board of Directors J. PATRICK GALLAGHER, JR. Chairman of the Board Chief Executive Officer RICHARD HARRIES 1,4 Former Chief Executive Officer Atrium Underwriters Limited SHERRY BARRAT 2,3 Former Vice Chairman Northern Trust Corporation TERESA CLARKE 1,4 Chair and Chief Executive Officer Africa.com LLC JOHN COLDMAN 4 Former Chairman The Benfield Group DAVID JOHNSON 2,3,4 Lead Director Former Chief Executive Officer of North America Aryzta AG 1Member of the Audit Committee 2Member of the Compensation Committee 3Member of the Nominating/Governance Committee ⁴Member of the Risk and Compliance Committee Further information regarding the principal employment or occupation of each director may be found beginning on page 5 of the proxy statement. CHRIS MISKEL2,3 President and Chief Executive Officer Versiti, Inc. RALPH NICOLETTI 1 Former Senior Vice President and Chief Financial Officer The AZEK Company DEBORAH CAPLAN 2,3 Former Executive Vice President Human Resources and Corporate Services NextEra Energy, Inc. NORMAN ROSENTHAL, PH.D.1,4 President Norman L. Rosenthal & Associates, Inc.

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Global Headquarters 2850 Golf Road Rolling Meadows, IL 60008-4050 (630) 773-3800 www.AJG.com© 2026 Arthur J. Gallagher & Co.

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### Attached PDF Documents

**Attachment 1:** `ajg014803-ars.pdf`

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