List of Marsh McLennan subsidiaries

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

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.

Marsh Corretora De SegurosMarsh Corretora De Seguros
Showing 26 of 1,653 companies
Company NameCountryCityAddress 1State/ProvincePostal CodeWebsiteFounding YearYearly Revenue in U.S. DollarsEmployees TotalBusiness Legal Type - DescriptionNumber of Companies in GroupCompany Registration Number
1
Marsh Corretora De Seguros
Brazil
Sao Paulo
Rua Dr Rubens Gomes Bueno 691
São Paulo
04730-903
N/A
1967
$2,689,117,000
83,000
Partnership of unknown type
1653
61038592000125
2
Oliver Wyman Consultoria Em Estrategia De Negocios
Brazil
Sao Paulo
Rua Arquiteto Olavo Redig de Campos 105
São Paulo
04711-035
oliverwyman.*****
1999
$1,469,869
43
Partnership of unknown type
1653
03038563000167
3
Marsh Corretora De Seguros
Brazil
Belo Horizonte
Rua Bernardo Figueiredo 33
Minas Gerais
30220-140
marsh.*****
1998
0
31
1653
61038592000800
4
Marsh Corretora De Seguros
Brazil
Fortaleza
Av. Santos Dumont 6740
Ceará
60192-022
tpeseguros.*****
N/A
0
1
1653
61038592002683
5
Marsh Corretora De Seguros
Brazil
Recife
Av. Republica Do Libano 251
Pernambuco
51110-160
N/A
N/A
0
0
1653
61038592002764
6
Marsh LLC
USA
New York City
1166 Avenue of the Americas
New York
10036
marshmclennan.*****
1999
$21,081,531
27,000
Corporation
1653
3005668
7
Marsh & Mclennan Agency LLC
USA
West Point
300 W 10th St
Bibb
31833
jsmithlanier.*****
N/A
0
572
1653
N/A
8
Wortham, L.L.C.
USA
Houston
2727 Allen Pkwy Ste 2400
Harris
77019
fconline.*****
2002
$9,344,163
470
Corporation
1653
0800150981
9
John L. Wortham & Son, LIMITED Partnership
USA
Fort Worth
1600 W 7th St Ste 300
Tarrant
76102
N/A
N/A
0
217
1653
N/A
10
Mercer Health & Benefits LLC
USA
Hoboken
121 River St
Hudson
07030
mercer.*****
N/A
0
185
1653
N/A
11
Mercer Health & Benefits LLC
USA
Wilmington Manor
1201 N Market St Ste 500
New Castle
19801
mercer.*****
N/A
0
99
1653
N/A
12
Marsh & Mclennan Agency LLC
USA
Fargo
721 1st Ave N
Cass
58102
dawsonins.*****
N/A
0
45
1653
N/A
13
Querbes & Nelson, INC.
USA
Shreveport
214 Milam St
Caddo
71101
qnins.*****
2023
$2,526,568
40
Corporation
1653
721110665
14
Guy Carpenter & Company, LLC
USA
New York City
1166 Avenue of the Americas
New York
10036
guycarp.*****
N/A
0
39
1653
N/A
15
Mercer (us) LLC
USA
Irvine
17901 von Karman Ave Ste 1100
Orange
92614
mercer.*****
N/A
0
39
1653
N/A
16
Marsh USA LLC
USA
Urbandale
12421 Meredith Dr
Polk
50398
mercer.*****
N/A
0
38
1653
N/A
17
Paynewest Insurance, INC.
USA
Bend
606 Nw Arizona Ave
Deschutes
97703
paynewest.*****
N/A
0
37
1653
N/A
18
Marsh USA LLC
USA
Philadelphia
1717 Arch St
Philadelphia
19103
marshmma.*****
N/A
0
31
1653
N/A
19
Mercer (us) LLC
USA
Atlanta
3560 Lenox Rd Ne Ste 2400
Fulton
30326
mercer.*****
N/A
0
31
1653
N/A
20
Marsh & Mclennan Agency LLC
USA
Anchorage
1031 W 4th Ave Ste 400
Anchorage
99501
marshmma.*****
N/A
0
31
1653
N/A
21
Clark Insurance
USA
Saco
15 Pepperell Sq Ste 2
York
04072
clarkinsurance.*****
N/A
0
20
1653
N/A
22
Mercer (us) LLC
USA
Dallas
1717 Main St Ste 4400
Dallas
75201
mercer.*****
N/A
0
17
1653
N/A
23
Aermetric Technology Group, INC.
USA
San Diego
401 W A St Ste 200
San Diego
92101
N/A
2019
$971,512
15
Corporation
1653
7473090
24
Mercer (us) LLC
USA
Vernon Hills
544 Lakeview Pkwy Ste 300
Lake
60061
mercer.*****
N/A
0
14
1653
N/A
25
Marsh & Mclennan Agency LLC
USA
Overland Park
7015 College Blvd Ste 400
Johnson
66211
marshmma.*****
N/A
0
14
1653
N/A
26
Marsh USA LLC
USA
Chicago
225 W Wacker Dr Fl 5
Cook
60606
usa.*****
N/A
0
12
1653
N/A

Showing 26 of 1,653 companies

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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.

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.

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.

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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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