Is Marsh McLennan Agency a subsidiary of Marsh?

Yes. Marsh & McLennan Agency LLC is an indirect wholly owned subsidiary of Marsh & McLennan Companies, Inc. It operates within the Marsh Risk segment and serves the North American middle market, employee benefits, private client, and retirement businesses.

Is Marsh McLennan Agency publicly traded?

No. The agency is not separately listed. The parent company trades on the New York Stock Exchange under the ticker MRSH, changed from MMC in January 2026. Agency results are consolidated within Marsh Risk reporting.

What is Marsh McLennan Agency's market position?

Following the November 2024 acquisition of McGriff Insurance Services for $7.75 billion, Marsh McLennan Agency ranks among the largest insurance agencies in the United States. McGriff contributed approximately $1.3 billion of annual revenue and more than 3,500 colleagues to the combined organization.

What is the difference between Marsh and Marsh McLennan Agency?

Marsh serves large global corporate accounts with multinational insurance programs. Marsh McLennan Agency serves the middle market: regional and midsize companies plus employee benefits, personal lines, and retirement services. Both operate inside the parent's Marsh Risk segment.

What happened with the McGriff acquisition?

Marsh & McLennan Agency acquired McGriff Insurance Services on November 15, 2024, for $7.75 billion in cash. McGriff's 3,500-plus colleagues joined the agency business. The deal, announced September 30, 2024, was the largest acquisition in the parent company's history and completed integration during 2025.

Insurance

Who Owns Marsh McLennan Agency?

Q: When was Marsh McLennan Agency founded?

Marsh & McLennan Companies created the business in 2009 to serve midsize North American clients that the flagship Marsh brokerage did not address efficiently. It grew through dozens of regional agency acquisitions and the transformational 2024 purchase of McGriff.

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.

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Parent Company

Marsh & McLennan Companies, Inc.

Founded

2009

Status

Publicly Traded

Headquarters

White Plains, New York, USA

Marsh McLennan Agency Timeline

1905

Marsh & McLennan Companies, Inc.

Parent company established in New York City, New York, USA

Company Founded

2009

Marsh McLennan Agency

Founded by Marsh & McLennan Companies (internal development)

Founded

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

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Where Is Marsh McLennan Agency Made / Based?

Headquarters: White Plains, New York, USA

Marsh McLennan Agency Categories & Tags

Insurance Agency Middle Market Employee Benefits Business Insurance Marsh Mclennan

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

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
MercerSister Brand	Marsh Mclennan	USA	1945	Mass market	Global	All Genders

Learn More About Competitors

Finance Fintech

Mercer

Owned by Marsh & McLennan Companies, Inc.

Global HR, health, wealth, and career consulting firm founded in 1945, owned by Marsh & McLennan Companies since 1959.

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FM

Owned by FM

The master brand of FM, the mutual commercial property insurer formerly known as FM Global, headquartered in Johnston, Rhode Island.

property-insuranceloss-preventionmutual

Privately Owned

FM is privately owned, unlike Marsh McLennan Agency which is under a publicly traded parent company.

Marsh & McLennan Companies, Inc. Stock Information

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Who Owns Marsh McLennan Agency?

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Parent Company

Marsh & McLennan Companies, Inc.

Founded

2009

Status

Publicly Traded

Headquarters

White Plains, New York, USA