Marsh McLennan · Corporate hierarchy

Marsh McLennan subsidiaries: 1,699 companies owned in 2026

Gain a deeper understanding of how Marsh McLennan is organized around the world. Founded in 1969, Marsh McLennan operates a network of 1,699 subsidiaries across 88 countries, with 671 in the United States (39.5%), 245 in the United Kingdom (14.4%), and 68 in Australia (4.0%). Together these three countries account for 57.9% of the companies owned by Marsh McLennan.

LIVE DATA STREAM • 2026 Audit

Marsh McLennan

Company Hierarchy

Total Subsidiaries1,699
Countries88
Total Revenue (est)
Founded1969
CompanyLocationFoundedEmployeesRevenue (USD)Legal TypeCEOWebsiteCategory CodeCategory Description# in GroupLocal HQ NameLocal HQ CityLocal HQ CountryNational HQ NameNational HQ CityGlobal HQ NameGlobal HQ CityGlobal HQ Country
Enterprise

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Explore Marsh McLennan’s subsidiaries and corporate hierarchy

Marsh McLennan’s ownership network is one of more than 41 million corporate hierarchies in our company ownership database. It maps parent companies, subsidiaries and ultimate beneficial owners (UBO), showing how companies are structured and who owns whom, with verified data across 200 countries and jurisdictions. Explore how the dataset works and request a tailored sample.

Marsh McLennan Company Facts

01

Where is Marsh McLennan headquartered?

In New York, United States (company ID 0152675489).

02

How many subsidiaries does Marsh McLennan have?

About 1,699 across 88 countries.
03

Who owns Marsh McLennan?

Marsh McLennan is publicly traded with no single majority owner.

04

Is Marsh McLennan a US company?

Yes. It is incorporated in the United States.

05

How many people work for Marsh McLennan?

The company employs approximately 85,000 people globally.

Corporate family tree

Understanding Marsh McLennan's Ownership Structure

Knowing who owns and controls a company helps reveal how it operates worldwide. Our corporate hierarchy data shows connections between parent companies, subsidiaries, and shareholders, laying out the structure and control within global groups. Whether you are researching Marsh McLennan or any other large multinational, this detailed ownership insight supports compliance checks, market research, and better CRM data management. CompanyData.com offers verified ownership data on over 380 million companies globally, giving you a clear picture of company relationships across industries and countries.

How We Chart Global, National, and Local Headquarters for Marsh McLennan

At CompanyData.com, each company profile, such as Marsh McLennan, is detailed using a three-level headquarters hierarchy: Global, National, and Local. This method clarifies how different branches connect in the wider group.

Our three key levels

  • Global Headquarter — Marsh McLennan Companies, Inc., headquartered in New York City, USA, acts as the global headquarter, overseeing all group operations worldwide.
  • National Headquarters — Country-specific entities manage local operations and report to the global parent. Examples include Marsh McLennan Canada Ltd. (Canada), Marsh McLennan UK Ltd. (United Kingdom), and Marsh McLennan France SARL (France).
  • Local Headquarters — Local offices operate within regions or cities, handling area-specific compliance, sales, and service delivery.

Every company in the group is assigned a unique ID, helping to link subsidiaries to their parent firms and track ownership. This allows seamless integration into your systems.

How ownership control works

Control is defined by shareholding. Where Marsh McLennan owns over 50% of a company, that company is flagged as a controlled subsidiary. We highlight these majority stakes to clearly map the corporate groups. This helps users understand complex relationships in groups like Marsh McLennan as well as other global firms.

Why it is important

This model reveals who makes key decisions within the Marsh McLennan Group, making compliance, risk assessment, and corporate research easier. With verified ownership covering more than 1,587 subsidiaries across 100+ countries, including significant presence in the USA (642 entities), United Kingdom (250 entities), Australia (67 entities), Canada (51 entities), and France (27 entities), our platform provides clarity for international teams working with Marsh McLennan’s complex structure.

 

How We Chart Global, National, and Local Headquarters for Marsh McLennan

Who This Solution Is For

CompanyData.com provides verified insights into the global corporate structure of Marsh McLennan, offering detailed data on its subsidiaries worldwide. This information supports compliance checks, CRM enrichment, market research, and competitive analysis. Sample data for evaluation is available, with larger datasets (up to 1,000 companies) for qualified corporate users with a verified website and clear use case. For direct contact or lead lists, please see our Company Data Platform.

  • Submit your data needs and use case
  • Samples available for registered companies with an active website
  • Data delivered in CSV or Excel formats
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Tell us about your data needs or challenge, and our team will send you a tailored ownership data sample within 24 hours.

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Marsh McLennan global corporate structure and subsidiary data – FAQs

You can get Marsh McLennan company data through API, bulk files, or the Bold Platform. We build custom datasets based on your specific countries, industries, and company profiles. After sharing your needs, our experts prepare a tailored dataset and send a free quote with record counts and sample data within 24 hours. Once approved, we deliver the data quickly in Excel, API, or bulk file format.

Yes. CompanyData.com offers complete global business data across all companies and sectors. Tell us your requirements and we will create a custom dataset with verified and up-to-date business information. You get a free quote, record count, and sample within 24 hours. Delivery is quick and available via Excel, API, or bulk files.

Pricing for Marsh McLennan company data depends on the details and delivery method you choose. Whether you want all subsidiaries or a smaller list, we have flexible pricing. Request a free quote and record count within 24 hours. We include a sample of 10 company contacts. At CompanyData.com, you pay only for verified data you need.

We accept credit cards, bank transfers, and PayPal. Payments are secure, and invoices are provided. For large or ongoing orders, subscription billing and custom invoicing are available. Contact our sales team for special arrangements — we’re here to assist.

You will receive verified data on Marsh McLennan and its subsidiaries worldwide, updated regularly. The dataset includes company names, registration details, locations, industry codes, financial info, and key contacts. Access is available via the Bold Platform, API, or bulk files. Our coverage is global and complete.

Our data is sourced from verified global business registers, financial filings, LEI records, trusted partners, and official company websites. Each record is cross-checked and validated to ensure accuracy, timeliness, and GDPR compliance.

Get a Free Quote and Sample

Tell us your target group, and we’ll send you a free quote and a tailored company ownership dataset — sample included. Call +31 20 705 236 or email sales@companydata.com. Ready to order? Simply reply to the quote, and CompanyData.com delivers your dataset in CSV or Excel within 24 hours.

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