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Putting clients at the center of everything we do, understanding their unique needs, challenges, and objectives to deliver tailored solutions that create measurable value.

Client Focus

Acting with the highest ethical standards as outlined in 'The Greater Good' Code of Conduct, maintaining transparency, honesty, and accountability in all client and colleague interactions.

Integrity

Leveraging the collective expertise of 90,000+ colleagues across four businesses and 130 countries to deliver integrated solutions and share knowledge across practices and geographies.

Collaboration

Pursuing continuous improvement in service delivery, analytical capabilities, and professional development while maintaining 17 consecutive years of margin expansion through operational discipline.

Excellence

Embracing new technologies, methodologies, and approaches to risk management, strategic advisory, and human capital solutions to stay ahead of evolving client needs and market dynamics.

Innovation

Marsh McLennan is the world's leading professional services firm in risk, strategy, and people, operating through four market-leading businesses: Marsh (insurance broking), Guy Carpenter (reinsurance), Mercer (HR consulting), and Oliver Wyman (management consulting). With over 90,000 colleagues across 130 countries, the company generated $24.5 billion in revenue in 2024.

John Q. Doyle

President and Chief Executive Officer

Mark McGivney

Chief Financial Officer

Martin South

President and Chief Executive Officer, Marsh

Dean Klisura

President and CEO, Guy Carpenter; Vice Chair, Marsh McLennan

Pat Tomlinson

President and CEO, Mercer

Nick Studer

President and CEO, Oliver Wyman

Katherine J. Brennan

Senior Vice President and General Counsel

Paul Beswick

Senior Vice President and Global Chief Information and Operations Officer

Marsh & McLennan Companies, Inc., doing business as Marsh McLennan and Marsh, is a global professional services firm, headquartered in New York City with businesses in insurance brokerage, risk management, reinsurance services, talent management, investment advisory, and management consulting. Its four main operating companies are Marsh, which offers risk management, insurance broking, insurance program management, risk consulting, analytical modeling and alternative risk financing services; Marsh Re, a reinsurance intermediary and advisor; Mercer, which provides consulting to employers for health insurance, retirement plans, and pension plans; and Oliver Wyman, including Lippincott and NERA Economic Consulting, which provides consulting services. In 2024, risk and insurance services contributed a total of 63% of revenues and 71% of operating profit, while consulting contributed 37% of revenues and 29% of operating profit. It is the largest insurance broker worldwide.

https://en.wikipedia.org/wiki/Marsh_McLennan

World's largest insurance broker providing risk management, insurance broking, insurance program management, risk consulting, analytical modeling, and alternative risk financing services across commercial and consumer segments. Generated over $13 billion in revenue (53% of total) with 10% growth in 2024, serving clients across all industry sectors globally.

Marsh - Insurance Broking & Risk Advisory

Global leader in reinsurance broking and risk advisory services, offering reinsurance intermediation, strategic advisory, capital markets solutions, and analytics to help insurance companies manage their risk portfolios. Generated $2.4 billion revenue (10% of total) with 8% underlying growth in 2024, serving insurers worldwide.

Guy Carpenter - Reinsurance Services

Leading HR consulting firm delivering health, wealth, and career solutions including retirement plan design and administration, health and benefits consulting, investment consulting, talent strategy, workforce analytics, and HR technology. Generated $5.7 billion revenue with 3% growth in 2024, helping organizations optimize human capital strategies.

Mercer - Human Resources Consulting

Premier management consulting firm specializing in strategy, economic analysis, financial services, retail, transportation, energy, healthcare, and public policy. Generated $3.4 billion revenue with impressive 9% growth in 2024, serving as strategic, economic, and brand advisor to private sector and government clients globally.

Oliver Wyman - Management Consulting

Middle market insurance brokerage platform serving regional businesses and specialty markets across the United States. Significantly expanded through November 2024 acquisition of McGriff Insurance Services, growing to approximately $5 billion in revenue with 3,500+ McGriff colleagues joining the platform.

Marsh McLennan Agency (MMA)

Proprietary analytics platforms, benchmarking tools, risk modeling capabilities, and data-driven insights leveraging decades of accumulated client engagement data across industries, geographies, and risk domains. Enables predictive modeling, scenario analysis, and evidence-based decision support for complex risk management challenges.

Risk Analytics & Data Solutions

Deep industry expertise in financial institutions, healthcare, energy, aerospace, construction, cyber risk, crisis management, political risk, environmental consulting, and other specialized domains. Combines technical knowledge with industry-specific benchmarking and regulatory expertise to address complex sector-specific challenges.

Specialty & Industry Practices

Marsh McLennan completed the acquisition of McGriff Insurance Services for $7.75 billion in cash on November 15, 2024, marking the largest acquisition in company history. McGriff's more than 3,500 colleagues joined Marsh McLennan Agency, expanding MMA to approximately $5 billion in revenue and significantly strengthening the company's presence in the U.S. middle market insurance brokerage segment. The acquisition is expected to be modestly accretive to adjusted EPS in 2025 with more significant positive impacts in 2026 and beyond.

Marsh McLennan Completes Record $7.75 Billion McGriff Insurance Services Acquisition

Marsh McLennan announced fourth quarter and full year 2024 results, reporting revenue of $24.5 billion for the full year, an 8% increase with 7% underlying organic growth. The company achieved 10% adjusted EPS growth to $8.80 and 80 basis points of adjusted margin expansion to 26.8%, marking the 17th consecutive year of reported margin expansion. Adjusted operating income increased 11% to $6.2 billion. CEO John Doyle stated: 'We are well positioned for another strong year in 2025, reflecting our unique capabilities and the enduring value we bring to clients.'

Marsh McLennan Reports Strong Q4 and Full Year 2024 Results with $24.5B Revenue

Marsh McLennan reported that 2024 was the largest acquisition year in company history, with completed deal values totaling approximately $27 billion and investment of $9.4 billion. Beyond the landmark McGriff acquisition, the company made strategic investments to strengthen capabilities across all four businesses. The aggressive acquisition strategy reflects management's confidence in integrating acquisitions while maintaining operational excellence, evidenced by 17 consecutive years of margin expansion even while absorbing major acquisitions.

Marsh McLennan Achieves Record M&A Year with $9.4 Billion in Completed Investments

Marsh McLennan's Risk and Insurance Services segment (Marsh and Guy Carpenter) generated $15.4 billion in revenue with 8% underlying growth in 2024, representing 63% of total company revenue. The Consulting segment (Mercer and Oliver Wyman) contributed $9.1 billion with 6% underlying growth. Marsh achieved 10% total growth with 7% underlying growth, Guy Carpenter grew 5% with 8% underlying growth, Mercer grew 3%, and Oliver Wyman delivered impressive 9% growth, demonstrating balanced performance across all businesses.

Marsh McLennan Reports 7% Organic Growth Across Risk & Insurance and Consulting Segments

Marsh McLennan reported adjusted operating margin of 26.8% for full year 2024, representing 80 basis points of expansion compared to 2023 and marking an extraordinary 17th consecutive year of reported margin expansion. This sustained operational excellence demonstrates the company's ability to drive efficiency improvements, leverage scale advantages, and optimize resource allocation even while integrating major acquisitions like the $7.75 billion McGriff deal. The margin expansion was achieved alongside strong top-line growth of 7% underlying revenue increase.

Marsh McLennan Extends Margin Expansion Streak to 17 Consecutive Years

Marsh McLennan returned significant capital to shareholders in 2024, repurchasing 4.3 million shares for $900 million and raising its quarterly dividend by 15%. The capital returns reflect the company's strong cash generation, financial flexibility, and confidence in future growth prospects even after investing $9.4 billion in acquisitions during the year. The company maintains investment-grade credit ratings while balancing strategic investments, acquisitions, and shareholder returns, demonstrating disciplined capital allocation.

Marsh McLennan Returns Significant Capital to Shareholders with $900M Buyback and 15% Dividend Increase

Marsh McLennan's 7% underlying organic growth during Q4 and full-year 2024 outpaced competitor Aon's 6% organic growth for the same period, demonstrating stronger market momentum and execution. As the industry leader with $24.5 billion in revenue (nearly double Aon's $13.4 billion), Marsh McLennan's ability to grow faster than smaller competitors while maintaining 17 years of consecutive margin expansion showcases superior competitive positioning, client relationships, and operational capabilities. The performance gap reinforces Marsh McLennan's market leadership in insurance brokerage and professional services.

Marsh McLennan Outperforms Competitors with 7% Organic Growth vs. Aon's 6%

Political Selling Alert 🚨 5 days ago, Rep. Tina Smith sold more stocks: $250K of $BRK.B (Berkshire Hathaway) Fully exited ~$100K of $MRSH (Marsh &amp; McLennan)

Marsh McLennan company review?

Anybody who worked at McGriff (now acquired by Marsh McLennan) what was your experience?

Marsh McLennan Early Career Program 2026

Phone screen for Marsh McLennan Agency internship — nervous and paused a lot, should I worry?

Marsh McLennan employer reviews?

Mercer / Marsh McLennan PH – HRSS Ops Associate, okay ba?

Got interview with Marsh Mclennan. tips?

Marsh &amp; Mclennan Companies, Inc.

Commercial Insurance Account Manager at Marsh McLennan

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MARSH & MCLENNAN COMPANIES, INC.

Henry W. Marsh founds his insurance business in Chicago following the Great Chicago Fire of 1871, which caused many insurers to go bankrupt, leaving policyholders without compensation and exposing the need for professional insurance intermediaries.

Marsh Founds Insurance Business

Henry W. Marsh and Donald R. McLennan merge their insurance businesses in Chicago to form Burroughs, Marsh & McLennan. The combined company becomes the largest insurance agency in the world with annual premiums of $3 million.

Company Founded Through Merger

Marsh & McLennan transforms from partnership to corporation, becoming Marsh & McLennan, Incorporated. The company acquires Guy Carpenter & Company, a reinsurance firm founded just one year earlier in 1922, establishing the foundation for future reinsurance leadership.

Corporate Structure and Guy Carpenter Acquisition

Marsh & McLennan acquires Mercer, a human resources consulting firm, marking the company's first significant expansion beyond pure insurance brokerage into professional services and HR consulting, laying groundwork for today's Consulting segment.

Mercer Acquisition

Marsh & McLennan becomes a publicly traded company through an initial public offering on the New York Stock Exchange, raising capital for expansion and increasing public visibility as the company pursues national and international growth.

Initial Public Offering

The Putnam Management Company becomes part of Marsh & McLennan, expanding the company's capabilities into investment management and asset management services, diversifying revenue streams beyond insurance brokerage and consulting.

Putnam Management Acquisition

Marsh & McLennan significantly boosts its insurance brokerage business with a $1.8 billion acquisition of Johnson & Higgins, one of the largest insurance broker acquisitions of the era, substantially expanding market share and client relationships.

Johnson & Higgins Acquisition

Marsh & McLennan acquires Oliver Wyman, a premier management consultancy with deep expertise in financial services and strategic advisory, establishing the fourth pillar of the company's business portfolio alongside Marsh, Guy Carpenter, and Mercer.

Oliver Wyman Acquisition

Marsh & McLennan sells Kroll, its corporate intelligence and investigative unit, to Altegrity Inc. for $1.13 billion, streamlining the business portfolio to focus on core insurance, reinsurance, HR consulting, and management consulting services.

Kroll Divestiture

Marsh McLennan acquires Jardine Lloyd Thompson Group for £4.3 billion ($5.6 billion), one of the largest insurance broker acquisitions in history, significantly expanding capabilities in Asia and specialty insurance markets.

Jardine Lloyd Thompson Acquisition

The company officially rebrands from Marsh & McLennan Companies to Marsh McLennan, modernizing its identity and simplifying brand architecture while honoring the founders' legacy from 1905.

Company Rebrand

John Q. Doyle is appointed President and Chief Executive Officer effective January 1, 2023, succeeding Daniel S. Glaser. Doyle, who joined the firm in 2016 and previously led Marsh as President and CEO from 2017-2021, brings over 35 years of industry experience to the role.

John Doyle Becomes CEO

Marsh McLennan completes acquisition of McGriff Insurance Services for $7.75 billion on November 15, 2024, the largest acquisition in company history. McGriff's 3,500+ colleagues join Marsh McLennan Agency, expanding MMA to approximately $5 billion in revenue and significantly strengthening U.S. middle market presence.

McGriff Insurance Services Acquisition

Marsh McLennan closes 2024 with record performance: $24.5 billion revenue (8% increase), 7% underlying revenue growth, 10% adjusted EPS growth to $8.80, 80 basis points of adjusted margin expansion to 26.8%, marking 17th consecutive year of margin expansion. Total M&A investment reaches record $9.4 billion for the year.

Record Financial Performance

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Hermes Robotics is a San Francisco-based robotics company founded that provides autonomous street sweeping as a service by retro-fitting existing vehicles with autonomous technology. The YC W21 company achieved $1M in revenue in 2024 with a lean team of just 5 employees, raised $125K from Y Combinator plus additional bootstrap funding, and received an M&A offer in April 2025.

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