Who Owns Aon?
Aon is the unified brand of Aon plc, the world's largest insurance broker by revenue. The NYSE-listed firm, domiciled in Dublin, operates under a single brand across brokerage, reinsurance, and human capital consulting. FY2025 revenue was $17.2 billion.
GlobalOfficial Website
Who Owns Aon?
- Parent Company: Aon plc
- Ownership Type: Wholly owned
- Company Type: Publicly Traded
- Stock Ticker: NYSE: AON
| Brand | Parent Company | Ownership Type |
|---|---|---|
| Aon | Aon plc | Wholly owned |
History of Aon
- Founded: 1982
- Founders: Patrick Ryan, W. Clement Stone
The name comes from the Gaelic word for one, adopted in 1987 by the company formed from the 1982 merger of Ryan Insurance Group and Combined International. The brand replaced a collection of acquired agency names as the firm consolidated under Patrick Ryan.
Major expansion came through acquisition: Alexander & Alexander's brokerage operations in 1997, Benfield's reinsurance business in 2008, and Hewitt Associates in 2010. The 2024 NFP acquisition added middle-market reach. A blocked $30 billion merger with Willis Towers Watson in 2021 remains the brand's biggest regulatory setback.
About Aon plc
What does Aon do?
Aon is the world's largest insurance broker by revenue. It advises clients on risk, places insurance and reinsurance, and consults on health, benefits, and retirement through its Risk Capital and Human Capital segments.
Is Aon publicly traded?
Yes. Aon plc trades on the New York Stock Exchange under ticker AON. It is domiciled in Dublin, Ireland.
Who founded Aon?
Aon was formed in 1982 by the merger of Ryan Insurance Group, founded by Patrick Ryan, and Combined International Corporation, founded by W. Clement Stone. Patrick Ryan led the combined company.
Where is Aon headquartered?
Aon is legally domiciled in Dublin, Ireland, at 15 George's Quay. Its principal operating centers are Chicago and London.
Who owns Aon?
Aon is publicly owned. Vanguard, BlackRock, and State Street are among the largest institutional shareholders. No controlling shareholder exists.
What is Aon's revenue?
Aon reported total revenue of $17.2 billion for fiscal 2025, split between $11.3 billion in Risk Capital and $5.9 billion in Human Capital.
- Founded: 1982
- Headquarters: Dublin, Ireland
- Company Type: Publicly Traded
- Stock: NYSE: AON
- Revenue: $17.2 billion (FY2025)
- Employees: ~60,000
Where Is Aon Made / Based?
- Headquarters: Dublin, Ireland
Aon Categories & Tags
Aon Ownership: Pros & Cons
Advantages
- +Largest global brokerage scale
- +Integrated Aon United model drives margin
- +Dominant reinsurance position
Considerations
- -Antitrust limits on large mergers, shown by the blocked Willis deal
- -Commission revenue follows premium cycles
- -Irish domicile adds regulatory complexity
Frequently Asked Questions About Aon
Sources & Further Reading
- Aon,
- Aon plc company profile, /companies/aon
- SEC EDGAR filings,
Competitors to Aon
No direct competitors found in the same category. This could be because Aonoperates in a unique market segment or we're still building our competitor database.
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insurancemutual-insuranceauto-insurance
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Nationwide is privately owned, unlike Aon which is under a publicly traded parent company.
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InsuranceNorthwestern Mutual
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American life insurance and financial planning brand owned by policyowners through The Northwestern Mutual Life Insurance Company, the largest direct provider of individual life insurance in the United States.
life-insurancefinancial-planningmutual-insurance
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Northwestern Mutual is privately owned, unlike Aon which is under a publicly traded parent company.
Aon plc Stock Information
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