Marsh & McLennan Companies, Inc.
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.
- Company typePublic
- Founded-
- HeadquartersNew York, United States
- Headcount10,001+
- GTM typeB2B
- OfferingServices
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.
Marsh & McLennan Companies, Inc. firmographics
Firmographics- 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
Marsh & McLennan Companies, Inc. industry classification
Industry- 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
Where Marsh & McLennan Companies, Inc. is headquartered
LocationHeadquarters
- HQ city
- New York
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Marsh & McLennan Companies, Inc. business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure
Revenue model
- 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.
- Reinsurance and Capital Services: Reinsurance intermediary services through Guy Carpenter, helping insurers manage risk capacity and capital efficiency.
- People and Investments Services: HR and investment consulting services through Mercer, including talent, health, wealth, and career solutions.
- 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
Marsh & McLennan Companies, Inc. product offering
Product offeringCore 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)
Companies that use Marsh & McLennan Companies, Inc.
Customer profileSegments9 records
Ideal customer profiles3 records
Marsh & McLennan Companies, Inc. technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Marsh & McLennan Companies, Inc. partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core and flagship.
- Bloomberg MediacoreMarsh 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 1flagshipMarsh 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
Marsh & McLennan Companies, Inc. competitors and assessment
Company assessmentDirect 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
Marsh & McLennan Companies, Inc. social profiles
Digital presenceMarsh & McLennan Companies, Inc. financial estimates
Financial estimateRevenue estimate
Valuation estimate
Marsh & McLennan Companies, Inc. leadership team
Management profileNumber of profiles
Marsh & McLennan Companies, Inc. subsidiaries and ownership
Company hierarchySubsidiaries4 records
Marsh & McLennan Companies, Inc. funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Marsh & McLennan Companies, Inc. M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Marsh & McLennan Companies, Inc.
What does Marsh & McLennan Companies, Inc. do?
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.
Is Marsh & McLennan Companies, Inc. a public or private company?
Marsh & McLennan Companies, Inc. is a public company. It is classified as public and is currently operating.
When was Marsh & McLennan Companies, Inc. founded?
Marsh & McLennan Companies, Inc. was founded in -1. It employs 10,001+ people.
Where is Marsh & McLennan Companies, Inc. based?
Marsh & McLennan Companies, Inc. is headquartered in New York, United States, in the North America region.
How does Marsh & McLennan Companies, Inc. make money?
Four revenue lines are on record. Risk and Insurance Services are the primary driver. The others are reinsurance and Capital Services, people and Investments Services and management Consulting.
Who are Marsh & McLennan Companies, Inc.'s main competitors?
Direct peers on record are Lockton Companies, Willis Towers Watson (WTW), Aon plc, Arthur J. Gallagher & Co., Brown & Brown, Inc. and Mercer peer: Aon (Human Capital). Broad incumbents are Oliver Wyman peer: Boston Consulting Group (BCG), Oliver Wyman peer: Bain & Company, Deloitte (Consulting) and Oliver Wyman peer: McKinsey & Company.
Does Marsh & McLennan Companies, Inc. have an API?
No public API is recorded for Marsh & McLennan Companies, Inc..
What industry is Marsh & McLennan Companies, Inc. in?
Marsh & McLennan Companies, Inc.'s product category is Professional Services — Risk, Reinsurance and Consulting Advisory. Its primary akta.pro industry code is FSAOAHAJ, Reinsurance Program Structuring & Portfolio Solutions (Broker-led), with a secondary code of FSAOAHAI, Reinsurance Claims, Accounting & Contract Administration (Broker Services). Its NAICS code is 52421 and its SIC code is 6411.