Aon plc (AON)
Aon provides insurance and reinsurance brokerage plus risk, retirement, and health consulting.
- Fiscal year end in SEC snapshot
- December 31
- Annual report period end
- 2025-12-31
SEC industry · SIC 6411
Insurance Agents, Brokers & Service stocks
5 distinct companies in our coverage share this SEC industry code, including Aon plc (AON), Arthur J. Gallagher & Co. (AJG), Brown & Brown, Inc. (BRO). Explore what each business does and open its annual filing below.
What this peer group tells you
The SEC classifies these issuers under “Insurance Agents, Brokers & Service” (SIC 6411). A shared code is a starting point for finding comparable businesses. Product mix, geography and customers can still differ substantially. Read the company descriptions before treating the group as direct competitors.
This group has 2 disclosed fiscal year-end dates. Align the reporting periods before comparing annual results. The calendar below shows each company’s year end separately from its filing date.
SEC data snapshot: . The linked reports are the annual filings stored in that snapshot; newer filings may exist. This is a coverage directory, not a complete industry census or a ranking of investments. Multiple share classes of one issuer count as one company.
Company profiles and annual filings
Arthur J. Gallagher & Co. (AJG)
Arthur J. Gallagher is an insurance brokerage and risk-management consulting firm serving businesses worldwide.
- Fiscal year end in SEC snapshot
- December 31
- Annual report period end
- 2025-12-31
Brown & Brown, Inc. (BRO)
Brown & Brown is an insurance brokerage placing coverage for businesses and individuals.
- Fiscal year end in SEC snapshot
- January 19
- Annual report period end
- 2025-12-31
Marsh & McLennan Companies, Inc. (MRSH)
Marsh & McLennan provides insurance brokerage, risk advisory, and human-capital consulting.
- Fiscal year end in SEC snapshot
- December 31
- Annual report period end
- 2025-12-31
Willis Towers Watson Public Limited Company (WTW)
Willis Towers Watson provides insurance brokerage, risk advisory, and human-capital consulting.
- Fiscal year end in SEC snapshot
- December 31
- Annual report period end
- 2025-12-31
Compare companies in this industry
AJG vs AON
Compare Arthur J. Gallagher & Co. and Aon plc: business context, fiscal calendars and official filings.
AJG vs BRO
Compare Arthur J. Gallagher & Co. and Brown & Brown, Inc.: business context, fiscal calendars and official filings.
AJG vs MRSH
Compare Arthur J. Gallagher & Co. and Marsh & McLennan Companies, Inc.: business context, fiscal calendars and official filings.
AJG vs WTW
Compare Arthur J. Gallagher & Co. and Willis Towers Watson Public Limited Company: business context, fiscal calendars and official filings.
AON vs BRO
Compare Aon plc and Brown & Brown, Inc.: business context, fiscal calendars and official filings.
AON vs MRSH
Compare Aon plc and Marsh & McLennan Companies, Inc.: business context, fiscal calendars and official filings.
Sources and directory method
Industry codes and annual filing references come from the SEC submissions snapshot linked to each issuer in our company catalog. Only groups with at least three distinct issuers, business descriptions and annual filing links are included.
SEC Standard Industrial Classification code list explains the classification system. Read our research methodology or browse all industry directories.
See whether the insurance agents, brokers & service thesis still holds.
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