Marsh McLennan
Mars McLennan (NYSE: MRSH) is a global professional services firm operating through Marsh Risk (insurance brokerage), Guy Carpenter (reinsurance), Mercer (HR consulting), and Oliver Wyman (management consulting), serving over 80% of Fortune 500 companies across 130+ countries with 95,000+ colleagues and approximately $24.5 billion in FY2024 revenue.
- Company typePublic
- Founded1961
- HeadquartersNew City, United States
- Headcount5,001–10,000
- GTM typeB2B
- OfferingServices
What Marsh McLennan does
Marsh McLennan, now operating under the Marsh brand following a January 2026 rebranding, is a publicly traded global professional services firm (NYSE: MRSH) organized around four wholly-owned operating units: Marsh Risk (insurance brokerage and risk advisory), Guy Carpenter (reinsurance brokerage and capital solutions), Mercer (human resources, benefits, and retirement consulting), and Oliver Wyman (management and strategic consulting). The firm serves more than 80% of Fortune 500 companies through an enterprise field sales model and operates across 130+ countries with over 95,000 colleagues, generating approximately $24.5 billion in FY2024 revenue and $7.6 billion in Q1 2026.
The company's product portfolio is anchored by commissioned insurance and reinsurance placement, project-based consulting fees, and managed services, with a growing digital layer led by the Risk Companion AI suite (including Renewal Companion and Captive Companion modules) that links proprietary risk datasets to actuarial models, plus specialty offerings such as the Secure Harbor group captive for senior living communities. Recent technology investments emphasize data and analytics as growth drivers within Risk & Insurance Services, supported by advanced cyber risk analytics tools and a Global Digital Infrastructure Leader role.
Marsh makes money through insurance brokerage commissions calculated as a percentage of placed premiums (Marsh and Guy Carpenter), consulting and managed services fees (Mercer), and project-based consulting fees (Oliver Wyman), with multi-year contracts, high client retention, and cross-segment wallet share. The firm is pursuing aggressive inorganic growth, having closed the $7.75 billion McGriff Insurance Services acquisition and announced the AltamarCAM deal (~$20 billion AUM), alongside targeted bolt-ons in HR consulting, captive solutions, and digital distribution platforms.
Marsh McLennan firmographics
Firmographics- Name
- Marsh McLennan
- Legal name
- Marsh & McLennan Companies, Inc.
- Website
- https://marshmclennan.com
- Company type
- Public
- Founded year
- 1961
- Operating status
- Operating
- Headcount range
- 5,001–10,000 employees
- Short description
- Mars McLennan (NYSE: MRSH) is a global professional services firm operating through Marsh Risk (insurance brokerage), Guy Carpenter (reinsurance), Mercer (HR consulting), and Oliver Wyman (management consulting), serving over 80% of Fortune 500 companies across 130+ countries with 95,000+ colleagues and approximately $24.5 billion in FY2024 revenue.
- Ownership category
- akta.pro rank
Marsh McLennan industry classification
Industry- Product category
- Insurance Brokerage and Risk Management Services
- NAICS
- Portfolio Management and Investment Advice (523940), Portfolio Management and Investment Advice (52394), Funds, Trusts, and Other Financial Vehicles (525)
- SIC
- Security & Commodity Brokers, Dealers, Exchanges & Services (6200), Investment Advice (6282)
- akta.pro primary industry
- Life & Health Reinsurance Brokerage (FSAOAHAF)
Keywords
Where Marsh McLennan is headquartered
LocationHeadquarters
- HQ city
- New City
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Marsh McLennan business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Insurance Brokerage: Marsh provides insurance brokerage services, placing risk with insurers and earning commissions. Revenue is driven by premium volumes, rate changes, and client retention in property-casualty and other insurance lines.
- Reinsurance Advisory: Guy Carpenter provides reinsurance brokerage and advisory services, helping clients transfer insurance risk to reinsurers. Revenue derives from reinsurance premiums placed and advisory fees.
- Human Resources Consulting: Mercer delivers HR consulting including benefits administration, retirement planning, talent management, and workforce solutions. Revenue includes consulting fees and managed services.
- Management Consulting: Oliver Wyman provides strategic and management consulting services. Revenue is generated through project-based consulting fees for corporate strategy, risk management, and operational advisory engagements.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Custom enterprise pricing based on client needs and service scope |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels5 records
Marsh McLennan product offering
Product offeringCore offering
Marsh McLennan (rebranded to Marsh effective January 2026) is a global professional services firm that delivers risk management, insurance brokerage, reinsurance advisory, human capital consulting, and management consulting. Its services are organized through four operating units: Marsh (insurance brokerage and risk advisory), Guy Carpenter (reinsurance), Mercer (HR and benefits consulting), and Oliver Wyman (strategic and management consulting).
Product overview
Marsh operates as a global professional services firm rebranded from Marsh McLennan to Marsh in January 2026, organized around four distinct business units: Marsh Risk (insurance brokerage and risk management), Guy Carpenter (reinsurance advisory), Mercer (HR and benefits consulting), and Oliver Wyman (management consulting). The company delivers an integrated product ecosystem where these four core businesses can connect data, insights, and solutions to address complex client challenges. Recent product launches include Risk Companion—an AI-enabled suite featuring Renewal Companion and Captive Companion modules for insurance renewal and captive management—and Secure Harbor, a group captive solution for senior living communities. The company serves clients across 130+ countries through over 95,000 colleagues.
Differentiator
Problem solved
Functional benefit
Products and services
- Marsh Risk (Insurance Brokerage and Risk Advisory) Insurance brokerage and risk advisory business providing risk consulting, insurance placement, and claims advisory services to enterprise clients across industries globally.
- Guy Carpenter (Reinsurance Advisory) Reinsurance advisory business providing risk transfer, capital market solutions, and analytics for insurers and reinsurers worldwide.
- Mercer (HR and Benefits Consulting) Human resources and benefits consulting business providing advisory services in workforce health, retirement, wealth, and career development for enterprise clients.
- Oliver Wyman (Management Consulting) Management consulting business providing strategic, operational, and risk consulting across industries including financial services, transportation, and industrial sectors.
- Risk Companion (AI-Enabled Suite) AI-enabled digital tools suite that links Marsh Risk's risk dataset to actuarial models, delivering structured outputs for testing insurance program structures and benchmarking, including Renewal Companion and Captive Companion modules.
- Secure Harbor Group captive insurance solution tailored for senior living communities, pooling risk for qualified participants to address liability coverage challenges in difficult insurance markets.
Companies that use Marsh McLennan
Customer profileNamed customers3 records
Segments7 records
Ideal customer profiles3 records
Marsh McLennan technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
AI capability8 records
Feature3 records
Marsh McLennan partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered core and flagship.
- Carlyle GroupcoreMarsh McLennan collaborated with Carlyle Group to develop a new portfolio risk framework integrating insurance implications of extreme weather events into asset valuation and investment decision-making. The four-step framework assesses asset exposure to climate hazards, identifies resilience gaps, estimates mitigation impact, and translates improvements into enhanced insurance terms.
- Association of Equipment ManufacturerscoreOliver Wyman and the Association of Equipment Manufacturers released a joint report on the North American industrial goods sector examining declining sentiment and revenue amid tariff uncertainty, inflation, and economic pressures.
- Bloomberg MediacoreMarsh McLennan and Bloomberg Media announced a global strategic partnership for knowledge sharing at Bloomberg's global marquee events. The collaboration focuses on providing analysis on risks including geopolitics, supply chain disruptions, and natural disasters, helping businesses increase resilience. This marks Marsh's first media initiative under its new Marsh brand identity.
- World Economic ForumcoreMarsh McLennan partners with the World Economic Forum on the annual Global Risks Report, drawing on insights from over 1,300 global leaders to identify the most pressing risks facing the world. The company also participates annually at the Davos forum alongside heads of state, CEOs, and policymakers.
- Formula 1flagshipMarsh serves as an Official Partner of Formula 1, providing brand visibility, corporate hospitality, and association with a premium global sports property.
Scale indicators8 records
Recent moves8 records
Expansion highlights6 records
Marsh McLennan competitors and assessment
Company assessmentBroad incumbents
- Bain & Company: Bain is a global management consulting firm directly comparable to Oliver Wyman in strategy, operations, and private equity advisory work. Competes for similar Fortune 500 engagements and talent.
- Boston Consulting Group: BCG is a top-tier global management consulting firm competing with Oliver Wyman across strategy, risk, and operations engagements. Comparable on Fortune 500 client base, though with a wider sector footprint.
- McKinsey & Company: McKinsey is a leading global management consulting firm competing with Oliver Wyman for C-suite strategic advisory engagements. Comparable on consulting model, talent pool, and Fortune 500 client base, though broader in scope.
Direct peers
- Aon plc: Aon is Marsh McLennan's closest direct competitor in global insurance and reinsurance brokerage, with a similarly diversified professional services platform and Fortune 500 client base. The two firms are routinely compared on scale, segment mix, and capital allocation.
- Willis Towers Watson: WTW is a global insurance brokerage and advisory firm competing directly with Marsh, Guy Carpenter, and Mercer in risk, reinsurance, and benefits consulting. It is the third major player in the global insurance brokerage peer set.
- Arthur J. Gallagher & Co. Gallagher is a top-tier global insurance brokerage and risk management services firm, directly competing with Marsh Risk and Guy Carpenter across commercial P&C and reinsurance. Also a serial acquirer in the brokerage roll-up space.
- Brown & Brown, Inc. Brown & Brown is a major US-focused insurance brokerage competing with Marsh in commercial insurance distribution and risk services. Highly comparable on commission-driven economics and acquisition-led growth.
- Lockton Companies: Lockton is the world's largest independent insurance brokerage, competing directly with Marsh in enterprise risk advisory and commercial placement. Privately held but comparable on Fortune 500 client focus and segment mix.
- Hub International: Hub International is a large North American insurance brokerage competing with Marsh in commercial P&C, employee benefits, and specialty risk, with a comparable decentralized operating model.
Emerging players
- Acrisure: Acrisure is a fast-growing, tech-enabled insurance brokerage that has rapidly scaled via acquisitions to challenge Marsh and Aon in commercial insurance distribution. Privately held but increasingly a direct peer in commercial and specialty brokerage.
Market position
Strengths5 records
Weaknesses1 record
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
Marsh McLennan social profiles
Digital presenceMarsh McLennan financial estimates
Financial estimateRevenue estimate
Valuation estimate
Marsh McLennan leadership team
Management profileNumber of profiles
Profiles8 records
Marsh McLennan subsidiaries and ownership
Company hierarchySubsidiaries10 records
Marsh McLennan funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Marsh McLennan M&A and investment
M&A and investmentM&A1 record
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Marsh McLennan
What does Marsh McLennan do?
Marsh McLennan (rebranded to Marsh effective January 2026) is a global professional services firm that delivers risk management, insurance brokerage, reinsurance advisory, human capital consulting, and management consulting. Its services are organized through four operating units: Marsh (insurance brokerage and risk advisory), Guy Carpenter (reinsurance), Mercer (HR and benefits consulting), and Oliver Wyman (strategic and management consulting).
Is Marsh McLennan a public or private company?
Marsh McLennan is a public company. It is classified as public and is currently operating.
When was Marsh McLennan founded?
Marsh McLennan was founded in 1961. It employs 5,001 to 10,000 people.
Where is Marsh McLennan based?
Marsh McLennan is headquartered in New City, United States, in the North America region.
How does Marsh McLennan make money?
Four revenue lines are on record. Insurance Brokerage is the primary driver. The others are reinsurance Advisory, human Resources Consulting and management Consulting.
Who are Marsh McLennan's main competitors?
Broad incumbents on record are Bain & Company, Boston Consulting Group and McKinsey & Company. Direct peers are Aon plc, Willis Towers Watson, Arthur J. Gallagher & Co., Brown & Brown, Inc., Lockton Companies and Hub International. Acrisure is listed as an emerging player.
Does Marsh McLennan have an API?
No public API is recorded for Marsh McLennan.
What industry is Marsh McLennan in?
Marsh McLennan's product category is Insurance Brokerage and Risk Management Services. Its primary akta.pro industry code is FSAOAHAF, Life & Health Reinsurance Brokerage. Its NAICS code is 523940 and its SIC code is 6200.