MARSH & MCLENNAN COMPANIES, INC.
Marsh & McLennan Companies, Inc., trading as Marsh McLennan and Marsh, is an American professional services firm headquartered in New York City, with businesses in insurance brokerage, risk management, reinsurance services, talent management, investment advisory, and management consulting. Its four main operating companies are Marsh (54% of 2025 revenues), which offers risk management, insurance broking, insurance program management, risk consulting, analytical modeling, and alternative risk financing services; Marsh Re (formerly Guy Carpenter; 10% of 2025 revenues), a reinsurance intermediary and advisor; Mercer (23% of 2025 revenues), which provides consulting to employers for health insurance, retirement plans, and pension plans; and Oliver Wyman (13% of 2025 revenues), including Lippincott and NERA Economic Consulting, which provides consulting services. In 2024, risk and insurance services contributed a total of 63% of revenues and 71% of operating profit, while consulting contributed 37% of revenues and 29% of operating profit.
Basic company information
Each field links to its source. Financial figures retain their reporting periods; background references are identified in the source list.
- Ticker / security symbols
- MRSH [1]
- Listing exchanges
- NYSE [1]
- SEC industry
- Insurance Agents, Brokers & Service [1]
- Company / filing name
- MARSH & MCLENNAN COMPANIES, INC. [1]
- Headquarters location
- New York City [2]
- Business address
- 1166 AVENUE OF THE AMERICAS, NEW YORK, NY, 10036 [1]
- Founded
- 1905 [2]
- Legal form
- Delaware corporation [2]
- Incorporation jurisdiction
- Delaware, United States [1]
- Official website
- www.mmc.com ↗ [2]
- Annual revenue
- USD 20,720,000,000 · reported year 2022 [2]
- Fiscal year end
- December 31 (SEC record) [1]
- ISIN (reported securities)
- US5717481023 [2]
- CIK
- 0000062709 [1]
- SIC code
- 6411 [1]
- Country in background record
- United States [2]
Company positioning and business
Marsh & McLennan Companies, Inc., trading as Marsh McLennan and Marsh, is an American professional services firm headquartered in New York City, with businesses in insurance brokerage, risk management, reinsurance services, talent management, investment advisory, and management consulting. Its four main operating companies are Marsh (54% of 2025 revenues), which offers risk management, insurance broking, insurance program management, risk consulting, analytical modeling, and alternative risk financing services; Marsh Re (formerly Guy Carpenter; 10% of 2025 revenues), a reinsurance intermediary and advisor; Mercer (23% of 2025 revenues), which provides consulting to employers for health insurance, retirement plans, and pension plans; and Oliver Wyman (13% of 2025 revenues), including Lippincott and NERA Economic Consulting, which provides consulting services. In 2024, risk and insurance services contributed a total of 63% of revenues and 71% of operating profit, while consulting contributed 37% of revenues and 29% of operating profit. [3]
The company is ranked 175th on the Fortune 500 and 267th on the Forbes Global 2000. [3]
Background text: Wikipedia contributors, Marsh McLennan. Selected introductory paragraphs, licensed under CC BY-SA 4.0. Official filing data is cited separately.
Understanding company scale
Annual revenue: USD 20,720,000,000 · reported year 2022. [2]
Financial year, securities and disclosures
The SEC submissions record gives MARSH & MCLENNAN COMPANIES, INC. a fiscal year end of 1231 (MMDD). Individual filings below identify their own reporting period; the filing date is the publication event, not the financial year end. [1]
Listed securities: MRSH (NYSE). Multiple symbols may represent different share classes or securities of the same registrant. [4]
History and key events
Financial results and regulatory disclosures
Annual, quarterly and current reports from the collected SEC record. Insider Forms 4 and 144 are excluded. This is a selected list, not a live filing feed.
Source-verified relationships
Companies in the same industry
Comparison candidates share the SEC SIC classification 6411. This does not imply ownership, partnership or trading relationships.
Related entities and concepts
Frequently asked questions
When was MARSH & MCLENNAN COMPANIES, INC. founded?
Founded: 1905. The linked source provides the background record. [2]
Where is the headquarters of MARSH & MCLENNAN COMPANIES, INC.?
Headquarters location: New York City. The linked source provides the background record. [2]
MARSH & MCLENNAN COMPANIES, INC. relationship map
Select a node to inspect its relationship and source.
2 verified direct relationships. Industry peers are not relationship edges.
Sources and review dates
- SEC — MARSH & MCLENNAN COMPANIES, INC. filing identity and securities ↗
- Wikidata — company background record (CC0) ↗
- Wikipedia contributors — Marsh McLennan (CC BY-SA 4.0) ↗
- SEC securities directory ↗
- Company chronology / filing ↗
Reviewed 23 October 2026. Financial periods and historical event dates are shown separately. Figures reflect their stated source dates; this page is not a live quote or investment recommendation.