Marsh & McLennan Companies, Inc.

What Marsh & McLennan Companies, Inc. does

Marsh & McLennan Companies, Inc. (operating under the brand "Marsh" effective January 2026, NYSE: MRSH) is a global professional services firm headquartered in New York with more than 95,000 colleagues across over 130 countries. The firm delivers advisory and intermediation services through four wholly owned operating subsidiaries: Marsh Risk (insurance brokerage, formerly branded as Marsh), Guy Carpenter (reinsurance and capital solutions), Mercer (people and investments advisory), and Oliver Wyman (management consulting). Its clients span at least nine vertical segments, including financial services (primary), healthcare, energy, manufacturing, construction, technology, retail, transportation, and the public sector.

Marsh operates a platform-plus-distinct-businesses architecture that allows clients to engage one subsidiary independently or combine capabilities across subsidiaries for integrated solutions. Revenue is generated through professional services fees negotiated on a quote-based, per-engagement basis under B2B enterprise contracts. The firm pursues a relationship-based, sales-led enterprise go-to-market motion with field sales across each subsidiary and cross-business referrals for clients with interconnected needs.

The underlying technology layer is not specified in the source material; the firm emphasizes its ability to connect data, insights, and solutions across its four businesses as a core capability. Pricing is not publicly disclosed, consistent with B2B professional services norms. The firm's brand assets include a 150+ year operating history dating to the post-Great Chicago Fire era, an Official Partner role with Formula 1, and a Global Knowledge Collaboration with Bloomberg Media announced in October 2025. Corporate actions in January 2026 included rebranding from Marsh McLennan to Marsh and changing the NYSE ticker from MMC to MRSH; both are brand strategy updates and do not alter business structure.

Name

Marsh & McLennan Companies, Inc.

Legal name

Marsh & McLennan Companies, Inc.

Website

https://mmc.com

Company type

Public

Operating status

Operating

Headcount range

10,001+ employees

Short description

Marsh & McLennan Companies (NYSE: MRSH) is a global professional services firm with 95,000+ colleagues across 130+ countries, delivering risk and insurance brokerage (Marsh Risk), reinsurance (Guy Carpenter), people and investments advisory (Mercer), and management consulting (Oliver Wyman) to enterprise clients across nine verticals.

Ownership category

akta.pro rank

Product category

Professional Services — Risk, Reinsurance and Consulting Advisory

NAICS

Insurance Agencies and Brokerages (52421), Agencies, Brokerages, and Other Insurance Related Activities (5242)

SIC

Insurance Agents, Brokers & Service (6411)

akta.pro primary industry

Reinsurance Program Structuring & Portfolio Solutions (Broker-led) (FSAOAHAJ)

akta.pro secondary industries

Reinsurance Claims, Accounting & Contract Administration (Broker Services) (FSAOAHAI), Life & Health Reinsurance Brokerage (FSAOAHAF)

Keywords

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

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Risk and Insurance Services: Insurance brokerage services helping organizations navigate risk and develop strategies. Provides risk assessment, insurance placement, and risk management consulting across industries.
2. Reinsurance and Capital Services: Reinsurance intermediary services through Guy Carpenter, helping insurers manage risk capacity and capital efficiency.
3. People and Investments Services: HR and investment consulting services through Mercer, including talent, health, wealth, and career solutions.
4. Management Consulting: Strategic management consulting through Oliver Wyman, providing industry-specific expertise and transformation services.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels4 records

Core offering

Marsh is a global professional services firm that delivers insurance brokerage and risk advisory (Marsh Risk), reinsurance and capital intermediary services (Guy Carpenter), people and investments consulting such as HR, talent, health, wealth and career solutions (Mercer), and strategic management consulting (Oliver Wyman). The firm serves organizations across multiple industries through enterprise field sales and cross-business integrated solutions.

Product overview

Marsh & McLennan Companies, Inc. operates as a global professional services firm organized as a platform-plus-distinct-businesses architecture. The company brings together four distinct sub-brands: Marsh Risk (formerly Marsh, the insurance broker), Guy Carpenter (reinsurance and capital), Mercer (people and investments), and Oliver Wyman (management consulting). Together they deliver integrated expertise across risk, reinsurance and capital, people and investments, and management consulting. The company rebranded from Marsh McLennan to Marsh effective January 2026, with its stock ticker changing from MMC to MRSH on the NYSE.

Differentiator

Problem solved

Functional benefit

Brands

• Marsh Risk: Insurance broker services (formerly just Marsh, rebranded January 2026)
• Guy Carpenter
• Mercer
• Oliver Wyman

Products and services

• Marsh Risk (Insurance Brokerage and Risk Advisory) Insurance brokerage and risk advisory services helping organizations navigate risk, develop their people and build strategies to thrive; serves enterprise clients across industries globally.
• Guy Carpenter (Reinsurance and Capital Solutions)

Segments9 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Two partnerships are on record, tiered core and flagship.

• Bloomberg MediacoreStrategic or Co-development Partner · 1 October 2025Marsh McLennan and Bloomberg Media announced a Global Knowledge Collaboration partnership. Through this partnership, Marsh brings together data and expertise with Bloomberg to deliver insights on risk, strategy, and people to a broader audience.
• Formula 1flagshipGTM or Marketing PartnerMarsh is an Official Partner of Formula 1. This partnership provides Marsh with global brand visibility, hospitality opportunities, and association with a prestigious international sports brand. Marsh has developed insights content around F1 risks and operational considerations.

Scale indicators3 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Lockton Companies: Lockton is the world's largest independent insurance brokerage, directly competing with Marsh Risk on commercial insurance placement, risk management consulting, and employee benefits.
• Willis Towers Watson (WTW): WTW is a direct competitor across insurance brokerage, reinsurance, and people/advisory (via its Talent & Rewards and Risk & Broking segments), mirroring Marsh's four-pillar structure.
• Aon plc: Aon is the closest direct peer to Marsh Risk and Guy Carpenter — a global insurance and reinsurance brokerage offering risk management, HR consulting, and health solutions across commercial and reinsurance markets.
• Arthur J. Gallagher & Co. Gallagher is a leading global insurance brokerage and risk management firm competing head-to-head with Marsh Risk, particularly in commercial and specialty lines for mid-market and enterprise clients.
• Brown & Brown, Inc. Brown & Brown is a US-centric insurance brokerage and risk solutions firm that competes with Marsh Risk on commercial and specialty insurance placements, particularly for middle-market accounts.
• Mercer peer: Aon (Human Capital): Aon's Human Capital Solutions practice competes directly with Mercer on health, wealth, talent, and career advisory services for corporate clients.

Broad incumbents

• Oliver Wyman peer: Boston Consulting Group (BCG): BCG is a top-tier global management consultancy competing directly with Oliver Wyman for industry-specific strategy, risk, and transformation engagements across sectors.
• Oliver Wyman peer: Bain & Company: Bain & Company competes with Oliver Wyman across strategy, operations, and transformation consulting, particularly in financial services and private equity advisory engagements.
• Deloitte (Consulting): Deloitte competes with both Oliver Wyman and Mercer on large-scale risk, transformation, and HR consulting mandates, leveraging its Big Four scale and audit adjacency.
• Oliver Wyman peer: McKinsey & Company: McKinsey is a global management consulting firm that competes with Oliver Wyman on strategic and industry-specific transformation mandates for large enterprise and financial services clients.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/MarshMcLennan

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries4 records

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about Marsh & McLennan Companies, Inc.