Who Owns Marsh McLennan Agency?
Marsh McLennan Agency is the North American middle-market insurance agency business of Marsh & McLennan Companies, Inc. (NYSE: MRSH). Established in 2009, it provides business insurance, employee benefits, private client, and retirement services to midsize organizations. The November 2024 acquisition of McGriff Insurance Services for $7.75 billion made it one of the largest US insurance agencies.
Parent Company
Founded
2009
Status
Publicly Traded
Headquarters
Marsh McLennan Agency Timeline
United StatesOfficial Website
Who Owns Marsh McLennan Agency?
- Parent Company: Marsh & McLennan Companies, Inc.
- Ownership Type: Subsidiary
- Company Type: Publicly Traded
- Stock Ticker: NYSE: MRSH
| Brand | Parent Company | Ownership Type |
|---|---|---|
| Marsh McLennan Agency | Marsh & McLennan Companies, Inc. | Subsidiary |
History of Marsh McLennan Agency
- Founded: 2009
- Founders: Marsh & McLennan Companies (internal development)
Marsh & McLennan Companies created Marsh McLennan Agency in 2009 to serve the North American middle market, a segment the flagship Marsh brokerage did not address efficiently. The large-account model, built for multinational programs, was too expensive to serve midsize regional businesses profitably.
The unit grew primarily through acquisition. Marsh McLennan Agency bought dozens of established regional agencies across the United States, converting local broker relationships into a national platform. Acquired agencies typically retained their local leadership and client relationships while gaining access to the parent's carrier network, data, and specialty resources. This roll-up strategy mirrored what competitors including Arthur J. Gallagher, Acrisure, and Hub International pursued in the same period.
By 2024, the unit had assembled a network covering most major US metropolitan markets. On September 30, 2024, Marsh McLennan announced it would acquire McGriff Insurance Services for $7.75 billion in cash, funded through a combination of cash and debt financing. McGriff, owned by private equity firm TIH, generated $1.3 billion of trailing twelve-month revenue and employed more than 3,500 people.
The transaction closed on November 15, 2024, making it the largest insurance agency acquisition in the parent's history. McGriff's commercial property and casualty, employee benefits, management liability, and personal lines operations were integrated into Marsh McLennan Agency through 2025.
The integration, completed during 2025, combined with the October 2025 Marsh masterbrand announcement to position the agency business for continued middle-market expansion. The unit operates under the Marsh masterbrand as part of the transition scheduled to complete in 2027.
About Marsh & McLennan Companies, Inc.
Is Marsh the same company as Marsh & McLennan?
Yes. Marsh & McLennan Companies, Inc. remains the legal name, but the company rebranded to Marsh effective January 2026. Its New York Stock Exchange ticker changed from MMC to MRSH on January 14, 2026. The four businesses, Marsh, Guy Carpenter, Mercer, and Oliver Wyman, will transition to the Marsh masterbrand by 2027.
Is Marsh publicly traded?
Yes. Marsh & McLennan Companies, Inc. trades on the New York Stock Exchange under the ticker MRSH. It is an S&P 500 component with a market capitalization above $100 billion.
When was Marsh founded?
The company was founded in 1905 in Chicago as Burroughs, Marsh & McLennan by Henry W. Marsh, Donald R. McLennan, and Daniel W. Burroughs. It was renamed Marsh & McLennan in 1906. Henry Marsh's own insurance business dated to 1871.
Who founded Marsh & McLennan?
Henry W. Marsh and Donald R. McLennan founded the firm with Daniel W. Burroughs in 1905. Marsh and McLennan pioneered the concept of the broker acting as a buyer of insurance on behalf of the client rather than a seller for the insurance company.
What is Marsh's market position?
Marsh is the world's largest insurance broker by revenue, generating $27.0 billion in 2025. It outranks Aon, Arthur J. Gallagher, and Willis Towers Watson. Its Guy Carpenter unit is a leading reinsurance broker, and Oliver Wyman is a major management consultancy.
What happened to Marsh McLennan Agency?
Marsh McLennan Agency continues to operate as the company's middle-market insurance agency business in North America. It acquired McGriff Insurance Services for $7.75 billion in November 2024, significantly expanding its scale in commercial property and casualty, employee benefits, and personal lines.
Has Marsh faced any controversies?
The most significant was the 2004 bid-rigging investigation by the New York Attorney General, which resulted in an $850 million settlement, the end of contingent commissions, and a change of CEO. The current Thrive restructuring program has also drawn scrutiny for associated workforce reductions.
- Founded: 1905
- Headquarters: New York City, New York, USA
- Company Type: Publicly Traded
- Stock: NYSE: MRSH
- Revenue: $27.0 billion (FY2025)
- Employees: Approximately 95,000
Where Is Marsh McLennan Agency Made / Based?
- Headquarters: White Plains, New York, USA
Marsh McLennan Agency Categories & Tags
Brands Owned by Marsh & McLennan Companies, Inc.
InsuranceGuy Carpenter
Owned by Marsh & McLennan Companies, Inc.
Leading global reinsurance broker founded in 1922, a Marsh business since 1923 that will adopt the Marsh Re name in 2027.
reinsuranceinsurance-brokercapital-advisory
InsuranceMarsh
Owned by Marsh & McLennan Companies, Inc.
World's largest insurance broker and risk advisory business, founded in 1905 and operating as the flagship business of Marsh & McLennan Companies.
insurance-brokerrisk-managementcommercial-insurance
Finance FintechMercer
Owned by Marsh & McLennan Companies, Inc.
Global HR, health, wealth, and career consulting firm founded in 1945, owned by Marsh & McLennan Companies since 1959.
hr-consultingemployee-benefitsinvestment-consulting
Finance FintechOliver Wyman
Owned by Marsh & McLennan Companies, Inc.
Global management consulting firm founded in 1984, acquired by Marsh & McLennan in 2003, now reported as Marsh Management Consulting.
management-consultingstrategy-consultingfinancial-services
Marsh McLennan Agency Ownership: Pros & Cons
Advantages
- +McGriff acquisition created top-tier scale in US middle-market broking
- +Access to Marsh specialty resources unavailable to independent agencies
- +Recurring commission revenue across four complementary product lines
- +Roll-up platform positioned for continued acquisition growth
- +Backed by the balance sheet of a $27 billion revenue parent
Considerations
- -$7.75 billion purchase price requires sustained integration execution
- -Intense competition from Gallagher, Acrisure, and private equity platforms
- -Commission income tied to commercial insurance pricing cycles
- -Acquired agency retention risk if producers leave post-acquisition
- -Marsh rebrand may reduce the distinct local agency identities clients value
Frequently Asked Questions About Marsh McLennan Agency
Sources & Further Reading
- Marsh McLennan Agency official website
- Marsh McLennan Completes Acquisition of McGriff Insurance Services
- Marsh McLennan to Acquire McGriff (September 2024)
- Reuters: Marsh McLennan Strikes $7.75 Billion McGriff Deal
- SEC 8-K: McGriff Merger Agreement
- Marsh McLennan and Its Businesses Will Brand as Marsh
- Marsh Investor Relations
Competitors to Marsh McLennan Agency
These competing brands operate in the same categories and provide similar products or services. Compare key attributes to understand market positioning and competitive landscape.
| Brand | Parent Company | Country | Founded | Market Position | Primary Market | Gender Target |
|---|---|---|---|---|---|---|
| Marsh Mclennan | USA | 1945 | Mass market | Global | All Genders |
Learn More About Competitors
Competitive Analysis
Market Positioning: Marsh McLennan Agency competes with 1 brands in the same categories, ranging from mass market to luxury positioning.
Geographic Distribution: Competitors are headquartered across multiple regions, indicating global competition in this market segment.
Brand Heritage: Competitor brands range from established heritage brands to newer market entrants, with founding years spanning several decades.
Independent Alternatives to Marsh McLennan Agency
Looking for brands with different ownership structures? These similar brands are not owned by Marsh & McLennan Companies, Inc., giving you alternative choices that support different corporate structures.
InsuranceAllied Insurance
Owned by Nationwide Mutual Insurance Company
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insuranceindependent-agentsproperty-casualty
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Allied Insurance is privately owned, unlike Marsh McLennan Agency which is under a publicly traded parent company.
InsuranceHaven Life
Owned by Massachusetts Mutual Life Insurance Company (MassMutual)
Former direct-to-consumer term life insurance brand launched by MassMutual in 2015 and wound down in 2024; existing policies remain serviced by MassMutual.
life-insuranceinsurtechterm-life
Privately Owned
Haven Life is privately owned, unlike Marsh McLennan Agency which is under a publicly traded parent company.
InsuranceMassMutual
Owned by Massachusetts Mutual Life Insurance Company (MassMutual)
Life insurance, annuity, and wealth management brand of Massachusetts Mutual Life Insurance Company, a mutual insurer founded in 1851 and headquartered in Springfield, Massachusetts.
life-insuranceannuitieswealth-management
Privately Owned
MassMutual is privately owned, unlike Marsh McLennan Agency which is under a publicly traded parent company.
InsuranceMassMutual Ascend
Owned by Massachusetts Mutual Life Insurance Company (MassMutual)
Cincinnati-based annuity company subsidiary of MassMutual, acquired as Great American Life Insurance in 2021, selling fixed, indexed, and registered index-linked annuities.
annuitiesretirementfixed-annuities
Privately Owned
MassMutual Ascend is privately owned, unlike Marsh McLennan Agency which is under a publicly traded parent company.
InsuranceNationwide
Owned by Nationwide Mutual Insurance Company
Consumer-facing insurance and financial services brand of Nationwide Mutual Insurance Company, the Columbus, Ohio mutual founded in 1926.
insurancemutual-insuranceauto-insurance
Privately Owned
Nationwide is privately owned, unlike Marsh McLennan Agency which is under a publicly traded parent company.
InsuranceNationwide Pet Insurance
Owned by Nationwide Mutual Insurance Company
America's first and largest pet insurance brand, founded as Veterinary Pet Insurance in 1982 and owned by Nationwide Mutual since 2009.
pet-insuranceinsurancepets
Privately Owned
Nationwide Pet Insurance is privately owned, unlike Marsh McLennan Agency which is under a publicly traded parent company.
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