List of Marsh McLennan subsidiaries

Verified insights into Marsh McLennan’s global corporate structure and subsidiaries.

Q: What does Marsh McLennan data cost?

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.

Q: What Marsh McLennan information is included?

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.

Marsh McLennan is a global professional services firm headquartered in New York, United States. Founded in 1905, Marsh McLennan operates through a broad corporate structure with 1,587 subsidiaries worldwide. This ownership data is part of CompanyData.com’s verified corporate hierarchy database, covering over 380 million companies worldwide.

Global presence of Marsh McLennan’s subsidiaries

Marsh McLennan has 1,587 subsidiaries spread across 68 countries. The largest numbers are in the United States with 642 entities (40%), followed by the United Kingdom with 250 subsidiaries (15.7%), and Australia with 67 subsidiaries (4.2%). These markets represent the main hubs of Marsh McLennan’s global operations across consulting, insurance, risk management, and other professional services.

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Top Subsidiaries and Companies Owned by Marsh McLennan

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	Company Name	Country	City	Address 1	State/Province	Postal Code	Website	Founding Year	Yearly Revenue in U.S. Dollars	Employees Total	Business Legal Type - Description	Number of Companies in Group	Company Registration Number
1	Marsh SAS	France	Puteaux	Tour Ariane	Hauts-de-seine	92800	marsh.*****	1957	$255,439,902	852	N/A	N/A	57217441500255
2	Mercer Investment Consulting LLC	USA	New York City	1166 Avenue of the Americas	New York	10036	mercer.*****	1975	$10,081,285	620	N/A	N/A	0140786
3	Mercer (france) SAS	France	Puteaux	Tour Ariane	Hauts-de-seine	92800	mercer.*****	1993	$127,230,962	537	N/A	N/A	39058945500117
4	Mercer (france) SAS	France	Wasquehal	20 All Du Chateau Blanc	Nord	59290	mercer.*****	2007	$0	100	N/A	N/A	39058945500125
5	Mercer Health & Benefits LLC	USA	Sacramento	2520 Venture Oaks Way Ste 250	Sacramento	95833	N/A	N/A	$0	73	N/A	N/A	N/A
6	Marsh USA INC.	USA	Columbus	325 John H Mcconnell Blvd Ste 350	Franklin	43215	marsh.*****	N/A	$0	64	N/A	N/A	N/A
7	Mercer (us) LLC	USA	Dallas	1717 Main St Ste 4400	Dallas	75201	mercer.*****	N/A	$0	17	N/A	N/A	N/A
8	Marsh & Mclennan Companies France	France	Puteaux	Tour Ariane la Defense 9	Hauts-de-seine	92800	marsh.*****	1974	$2,001,240	12	N/A	N/A	31631587800041
9	Marsh SAS	France	Aix-en-provence	La Robole	Bouches-du-rhône	13290	N/A	2018	$0	6	N/A	N/A	57217441500305
10	Marsh & Mclennan Companies, INC.	USA	Indianapolis	111 Monument Cir Ste 3550	Marion	46204	marsh.*****	N/A	$0	5	N/A	N/A	N/A
11	Thomsons Online Benefits INC.	USA	New York City	1166 Avenue of the Americas	New York	10036	N/A	2019	$744,968	5	N/A	N/A	N/A
12	Marsh SAS	France	Toulouse	12 Rue Gabriel Peri	Haute-garonne	31000	marsh.*****	2017	$0	3	N/A	N/A	57217441500297
13	Marsh SAS	France	Nantes	34 B Bd Gabriel Guist Hau	Loire-atlantique	44000	marsh.*****	2020	$0	1	N/A	N/A	57217441500339
14	Mercer (france) SAS	France	Montpellier	Immeuble Alliance 2	Hérault	34000	mercer.*****	2022	$0	0	N/A	N/A	39058945500141
15	Mercer Consulting (france) SAS	France	Pessac	Zone Europarc	Gironde	33600	everbe.*****	2022	$0	0	N/A	N/A	70201541300090
16	Oliver Wyman LIMITED	India	Mumbai	1201 Tower 2b One World Centre	Maharashtra	400013	oliverwyman.*****	N/A	$0	0	N/A	N/A	27AABCO0593J1ZA
17	Oliver Wyman LIMITED	India	Rangareddy	02b102, Kondapur Main Road, Kondapur, Whitefields, Laxmi Cyber C	Telangana	500081	N/A	N/A	$0	0	N/A	N/A	36AABCO0593J1ZB
18	Jlt Advisory Services LIMITED	India	New Delhi	98, Mezzanine Floor Hemkunt Tower	Delhi	110019	N/A	2001	$0	0	N/A	N/A	N/A
19	Nera S.A.S.	France	Paris	1 Rue Euler	Paris	75008	nera.*****	2003	$10,568,380	13	N/A	N/A	45125211800026
20	Marsh SAS	France	Orange	Zac Du Coudoulet	Vaucluse	84100	marsh.*****	2001	$0	10	N/A	N/A	57217441500198
21	Mercer Consulting (france) SAS	France	Paris	23 Bd Des Italiens	Paris	75002	mercer.*****	1984	$0	0	N/A	N/A	70201541300033
22	Oliver Wyman SNC	France	Paris	7 Rue Rouget de L Isle	Paris	75001	oliverwyman.*****	2022	$0	0	N/A	N/A	34496224600064
23	Mercer (france) SAS	France	Levallois-perret	36 Rue Raspail	Hauts-de-seine	92300	mercer.*****	1998	$0	0	N/A	N/A	39058945500042
24	Marsh & Mclennan Companies, INC.	USA	New York City	1166 Avenue of the Americas	New York	10036	marshmclennan.*****	1871	$24,458,000,000	90,000	N/A	N/A	1688200
25	Seabury & Smith Borrower LLC	USA	Urbandale	12421 Meredith Dr	Polk	50398	facebook.*****	N/A	$0	3,269	N/A	N/A	N/A
26	Mercer (australia) PTY LTD	Australia	Adelaide	L 7 91 King William St	South Australia	5000	N/A	1977	$542,857,459	322	N/A	N/A	005315917

Companies by Employee Size

1-4353
5-9239
10-19194
20-49184
50-9982
100-19970
200-49965
500-99921
1.000-4.9996
5.000-9.9991
0 or Unknown418

Companies by Revenue Size (in USD)

0 or Unknown955
1 to 100.0005
100.001 to 499.999133
500.000 to 999.999114
1.000.000.000 or more15
1.000.000 to 4.999.999156
5.000.000 to 9.999.99968
10.000.000 to 49.999.999110
50.000.000 to 99.999.99938
100.000.000 to 499.999.99934
500.000.000 to 999.999.9995

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Discover Marsh McLennan’s Global Corporate Structure

Marsh McLennan’s corporate network is part of over 41 million corporate hierarchies available in our company ownership database. It shows how the group is structured worldwide, with parent companies and subsidiaries backed by verified information from companies in more than 200 countries and territories. See how our data works and request a tailored sample today.

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Marsh McLennan Company Facts

Where is Marsh McLennan headquartered?

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

How many subsidiaries does Marsh McLennan have?

Around 1,587 companies in over 80 countries.

Who owns Marsh McLennan?

Marsh McLennan is publicly traded with no single majority owner.

Is Marsh McLennan a US company?

Yes. It is incorporated in the United States.

How many people work for Marsh McLennan?

The company employs approximately 85,000 people globally.

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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.

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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.

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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.

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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.

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