Where is Marsh McLennan headquartered?
In New York, United States (company ID 0152675489).
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.
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.
List of Marsh McLennan subsidiaries
Company Hierarchy
| Company | Location | Founded | Employees | Revenue (USD) | Legal Type | CEO | Website | Category Code | Category Description | # in Group | Local HQ Name | Local HQ City | Local HQ Country | National HQ Name | National HQ City | Global HQ Name | Global HQ City | Global HQ Country | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Marsh & Mclennan Companies, INC.Marsh & Mclennan Companies, INC.Global Headquarter | New York, USA | 1969 | 95,000 | $27.0B | Corporation | John Q Doyle | marshmclennan.com | 6411 | Insurance Agents, Brokers, and Service | 1699 | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | Marsh & McLennan Companies, Inc. | NEW YORK | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||
Mercer (australia) PTY LTDMercer (australia) PTY LTD | Melbourne, Australia | 15 | $643K | Steve Simioni | 8742 | Management Consulting Services | 1699 | MERCER (AUSTRALIA) PTY LTD | DOCKLANDS | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Marsh & Mclennan Companies, INC.Marsh & Mclennan Companies, INC.National HQ | Perth, Australia | 51 | Geoff Furgosn | 6289 | Services Allied With the Exchange of Securities or Commodities, Not Elsewhere Classified | 1699 | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | Marsh & McLennan Companies, Inc. | PERTH | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||||||
Mercer (australia) PTY LTDMercer (australia) PTY LTD | Sydney, Australia | 500 | John Newman | 8742 | Management Consulting Services | 1699 | MERCER (AUSTRALIA) PTY LTD | DOCKLANDS | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||||||
Bovill Risk & Insurance Consultants PTY. LTD.Bovill Risk & Insurance Consultants PTY. LTD. | Sydney, Australia | $144K | Joshua Illingworth Roach | honan.com.au | 6411 | Insurance Agents, Brokers, and Service | 1699 | BOVILL RISK & INSURANCE CONSULTANTS PTY. LTD. | DOCKLANDS | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Jlt Risk Solutions PTY LTDJlt Risk Solutions PTY LTD | Albury, Australia | $47K | Wayne Peter Vergano | jlta.com.au | 8741 | Management Services | 1699 | JLT RISK SOLUTIONS PTY LTD | SYDNEY | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Jlt Risk Solutions PTY LTDJlt Risk Solutions PTY LTD | Cairns City, Australia | $47K | Wayne Peter Vergano | jlta.com.au | 8741 | Management Services | 1699 | JLT RISK SOLUTIONS PTY LTD | SYDNEY | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Jlt Risk Solutions PTY LTDJlt Risk Solutions PTY LTD | Perth, Australia | $73K | Wayne Peter Vergano | jlta.com.au | 8741 | Management Services | 1699 | JLT RISK SOLUTIONS PTY LTD | SYDNEY | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Marsh Advantage Insurance PTY LTDMarsh Advantage Insurance PTY LTD | Townsville, Australia | $47K | Joshua Illingworth Roach | au.jlt.com | 8741 | Management Services | 1699 | MARSH ADVANTAGE INSURANCE PTY LTD | SYDNEY | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Marsh Advantage Insurance PTY LTDMarsh Advantage Insurance PTY LTD | Darwin, Australia | $42K | Joshua Illingworth Roach | marsh.com.au | 8741 | Management Services | 1699 | MARSH ADVANTAGE INSURANCE PTY LTD | SYDNEY | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Marsh PTY LTDMarsh PTY LTD | Melbourne, Australia | $42K | Martin South | australia.marsh.com | 8741 | Management Services | 1699 | MARSH PTY LTD | Barangaroo | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Marsh PTY LTDMarsh PTY LTD | Canberra, Australia | $47K | Martin South | marsh.com/au/home.html | 8741 | Management Services | 1699 | MARSH PTY LTD | Barangaroo | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Marsh Advantage Insurance PTY LTDMarsh Advantage Insurance PTY LTD | Darwin, Australia | $42K | Joshua Illingworth Roach | marsh.com.au | 8741 | Management Services | 1699 | MARSH ADVANTAGE INSURANCE PTY LTD | SYDNEY | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Honan Insurance Group PTY LTDHonan Insurance Group PTY LTD | Newcastle, Australia | $144K | Joshua Illingworth Roach | honan.com.au | 6411 | Insurance Agents, Brokers, and Service | 1699 | HONAN INSURANCE GROUP PTY LTD | SYDNEY | Australia | MMC HOLDINGS (AUSTRALIA) PTY LTD | Barangaroo | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Honan Insurance Group (asia) PTE. LTD.Honan Insurance Group (asia) PTE. LTD. | Singapore, Singapore | 1993 | 11 | $3.7M | Corporation | Joan Audrey Collar | honan.asia | 6411 | Insurance Agents, Brokers, and Service | 1699 | HONAN ASIA PTE. LTD. | SINGAPORE | Singapore | HONAN ASIA PTE. LTD. | SINGAPORE | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||
Honan Benefits PTE. LTD.Honan Benefits PTE. LTD. | Singapore, Singapore | 1995 | 11 | $4.0M | Corporation | Mohit Kanthra | 8742 | Management Consulting Services | 1699 | HONAN ASIA PTE. LTD. | SINGAPORE | Singapore | HONAN ASIA PTE. LTD. | SINGAPORE | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||
Jlt Singapore Holdings PTE. LTD.Jlt Singapore Holdings PTE. LTD.National HQ | Singapore, Singapore | 2003 | 50 | $12.8M | Corporation | Emembolu Oranye Ifeanyi | 6719 | Offices of Holding Companies, Not Elsewhere Classified | 1699 | JLT Asia Holdings B.V. | Rotterdam | Netherlands | JLT SINGAPORE HOLDINGS PTE. LTD. | SINGAPORE | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||
Marsh Mclennan India LIMITEDMarsh Mclennan India LIMITED | Bristol, Unitedkingdom | 6371 | Pension, Health, and Welfare Funds | 1699 | MARSH MCLENNAN INDIA LIMITED | LONDON | England | CALM TREASURY HOLDINGS LIMITED | LONDON | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||||||||
Marsh Mclennan India Holdings LIMITEDMarsh Mclennan India Holdings LIMITED | Manchester, Unitedkingdom | 7389 | Business Services, Not Elsewhere Classified | 1699 | MARSH MCLENNAN INDIA HOLDINGS LIMITED | LONDON | England | CALM TREASURY HOLDINGS LIMITED | LONDON | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||||||||
Marsh Corretora De SegurosMarsh Corretora De SegurosNational HQ | Sao Paulo, Brazil | 1967 | 83,000 | $2.7B | Partnership of unknown type | Eneida Ramos De Souza | 6411 | Insurance Agents, Brokers, and Service | 1699 | MMC Regional LATAM Holdings B.V. | Rotterdam | Netherlands | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||
Carpenter Marsh Fac Brasil Corretora De RessegurosCarpenter Marsh Fac Brasil Corretora De RessegurosLocal HQ | Sao Paulo, Brazil | 1977 | 80 | $2.6M | Partnership of unknown type | Eugenio Paschoal De Barros Antunes | carpetes.vip | 6411 | Insurance Agents, Brokers, and Service | 1699 | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Brazil | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||
Carpenter Marsh Fac Brasil Corretora De RessegurosCarpenter Marsh Fac Brasil Corretora De Resseguros | Rio de Janeiro, Brazil | 17 | Eugenio Paschoal De Barros Antunes | guycarp.com | 6411 | Insurance Agents, Brokers, and Service | 1699 | CARPENTER MARSH FAC BRASIL CORRETORA DE RESSEGUROS LTDA. | SAO PAULO | Brazil | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | |||||
Oliver Wyman Consultoria Em Estrategia De NegociosOliver Wyman Consultoria Em Estrategia De Negocios | Sao Paulo, Brazil | 1999 | 43 | $1.5M | Partnership of unknown type | Natalia Cibele Correia Da Silva | oliverwyman.com/br.html | 7389 | Business Services, Not Elsewhere Classified | 1699 | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Brazil | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||
Marsh Corretora De SegurosMarsh Corretora De Seguros | Belo Horizonte, Brazil | 1998 | 31 | Eugenio Paschoal De Barros Antunes | marsh.com | 6411 | Insurance Agents, Brokers, and Service | 1699 | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Brazil | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||||
Marsh Corretora De SegurosMarsh Corretora De Seguros | Campinas, Brazil | 1966 | 49 | Eugenio Paschoal De Barros Antunes | marsh.com.br | 6411 | Insurance Agents, Brokers, and Service | 1699 | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Brazil | MARSH CORRETORA DE SEGUROS LTDA. | SAO PAULO | Marsh & McLennan Companies, Inc. | NEW YORK | United States of America | ||||
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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.
In New York, United States (company ID 0152675489).
Around 1,587 companies in over 80 countries.
Marsh McLennan is publicly traded with no single majority owner.
Yes. It is incorporated in the United States.
The company employs approximately 85,000 people globally.
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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.
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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.
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.

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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