With a market capitalization (market cap) of $72.8B — a measure of how much the company is worth — Aon plc is the 245th most valuable company in Financial Services as of August 19, 2026. Shares trade at $343.20, down +1.16% on the day.
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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. The company offers commercial risk solutions comprising retail and insurance brokerage, specialty solutions, global risk consulting, captives management, and affinity programs; health solutions, such as consulting and brokerage, consumer benefits, and talent advisory services; and wealth solutions, including retirement consulting and investments. It also provides treaty and facultative reinsurance; strategy and technology group solutions; insurance-linked securities, capital raising, strategic advice, restructuring, and merger and acquisition services; and risk management products and solutions, capital market solutions, and corporate finance advisory services. In addition, the company offers strategic design advice and actuarial services; pension risk transfer and integrated pension administration; and investment advisory services on developing and maintaining investment programs across various plan types, including defined benefit plans, defined contribution plans, master trusts, and pooled employer plans for corporations, public pensions, endowments, and foundations. Aon plc was incorporated in 1979 and is headquartered in Dublin, Ireland.
Visit websiteAs of August 19, 2026, Aon plc (AON) is worth $72.8B — this is its market capitalization, the total value of all its outstanding shares.
Aon plc’s market cap is $72.8B, which ranks it #245 among the most valuable companies in the Financial Services sector tracked on MarketCapLens.
Aon plc (AON) shares trade at $343.20, down 1.16% on the day, as of August 19, 2026.
Aon plc trades at a price-to-earnings (P/E) ratio of 20.0, based on its latest share price and annual earnings per share.
Fundamentals are annual. Figures labeled with their fiscal year.
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