Marsh McLennan

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.

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

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

• Insurance brokerage
• Reinsurance advisory
• Risk management consulting
• Human resources consulting
• Management consulting services

Headquarters

HQ city

New City

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. 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.
2. 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.
3. Human Resources Consulting: Mercer delivers HR consulting including benefits administration, retirement planning, talent management, and workforce solutions. Revenue includes consulting fees and managed services.
4. 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

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core 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.

Named customers3 records

Segments7 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability8 records

Feature3 records

Partnerships

Five partnerships are on record, tiered core and flagship.

• Carlyle GroupcoreStrategic or Co-development Partner · 22 June 2026Marsh 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 ManufacturerscoreStrategic or Co-development Partner · 3 December 2025Oliver 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 MediacoreStrategic or Co-development Partner · 22 October 2025Marsh 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 ForumcoreStrategic or Co-development PartnerMarsh 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 1flagshipGTM or Marketing PartnerMarsh 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

Broad 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

• Xx.com/MarshMcLennan
• Facebookfacebook.com/MarshMcLennanCareers
• LinkedInlinkedin.com/company/marshmclennan

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Subsidiaries10 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Marsh McLennan