Aon plc
Aon plc (English: ) is an international professional services firm. It has two divisions: Risk Capital (67% of 2024 revenues), which provides brokerage and consulting services for risk management, insurance and reinsurance, and Human Capital (33% of 2024 revenues), which provides services related to health insurance, retirement plans, pension plans, and talent advisory.
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
- AON [1]
- Listing exchanges
- NYSE [1]
- SEC industry
- Insurance Agents, Brokers & Service [1]
- Business sectors
- professional service [2]
- Company / filing name
- Aon plc [1]
- Headquarters location
- London [2]
- Business address
- 15 GEORGES QUAY, DUBLIN 2, L2, D02 VR98 [1]
- Founded
- 1982 [2]
- Legal form
- public limited company [2]
- Incorporation jurisdiction
- Ireland [1]
- Founders
- Patrick George Ryan [2]
- Official website
- www.aon.com ↗ [2]
- Employees
- 65,000 · reported year 2012 [2]
- Annual revenue
- USD 12,479,000,000 · reported year 2022 [2]
- Fiscal year end
- December 31 (SEC record) [1]
- ISIN (reported securities)
- GB00B5BT0K07 [2]
- CIK
- 0000315293 [1]
- SIC code
- 6411 [1]
- Country in background record
- United Kingdom [2]
Company positioning and business
Aon plc (English: ) is an international professional services firm. It has two divisions: Risk Capital (67% of 2024 revenues), which provides brokerage and consulting services for risk management, insurance and reinsurance, and Human Capital (33% of 2024 revenues), which provides services related to health insurance, retirement plans, pension plans, and talent advisory. [3]
It is the second-largest insurance broker in the world and is ranked 300th on the Fortune 500 and 388th on the Forbes Global 2000. [3]
Founded in Chicago by Patrick Ryan, Aon was created in 1982 when the Ryan Insurance Group merged with the Combined Insurance Company of America under W. Clement Stone. In 1987, the holding company was renamed Aon, derived from aon, a Gaelic word meaning "one". The company's corporate headquarters is based in Dublin, while its global operations are based in London. It also maintains a major North American operational presence at the Aon Center in Chicago. [3]
Background text: Wikipedia contributors, Aon plc. Selected introductory paragraphs, licensed under CC BY-SA 4.0. Official filing data is cited separately.
Understanding company scale
Employees: 65,000 · reported year 2012. [2]
Annual revenue: USD 12,479,000,000 · reported year 2022. [2]
Financial year, securities and disclosures
The SEC submissions record gives Aon plc 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: AON (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 Aon plc founded?
Founded: 1982. The linked source provides the background record. [2]
Where is the headquarters of Aon plc?
Headquarters location: London. The linked source provides the background record. [2]
Which business sectors are recorded for Aon plc?
Business sectors: professional service. The linked source provides the background record. [2]
Aon plc 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 — Aon plc filing identity and securities ↗
- Wikidata — company background record (CC0) ↗
- Wikipedia contributors — Aon plc (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.