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Aon plc (AON) is a financial services company in the coverage sales services industry, based in Dublin, Ireland, with about 60,000 full-time employees.
Its largest business segment, Risk Capital, brought in 66% of segment revenue in fiscal year 2025; United States was the largest region with 48%. Its market capitalization was $58.01 billion as of October 9, 2026.
Figures from company filings and market data; market data as of October 9, 2026.
Aon plc operates as a professional services firm in the United States, rest of the Americas, the United Kingdom, Ireland, rest of Europe, the Middle East, Africa, and the Asia Pacific. It operates through Risk Capital and Human Capital segments.
Risk Capital, with $11.29 billion or 66% of segment revenue in fiscal year 2025. Next: Human Capital (34%).
United States: 48% of revenue by region in fiscal year 2025, followed by Europe, Middle East, & Africa Other than United Kingdom and Ireland (18%).
$58.01 billion as of October 9, 2026.
Listed companies of a similar size in the same industry (coverage sales services) include Arthur J. Gallagher & Co. (AJG), Willis Towers Watson Public Limited Company (WTW), Brown & Brown, Inc. (BRO), Maase Inc. (MAAS).