Aon plc
Market Cap
$59.0B
Global Rank
#237
All-Time High
$81.4B
2026-07-28
Total Growth
+0%
since 2026
Market Cap Context
- Larger than 35% of the 367 companies we track (globally).
- Just above: #236 Arthur J. Gallagher & Co. ($59.2B)
- Just below: #238 PACCAR Inc ($58.6B)
- Best year: 1995 (+62%). Worst year: 2002 (-45%).
Aon plc Financial Breakdown (FY 2025)
Source: Yahoo Finance — AON annual filings (2025) →$17.2B revenue · $4.7B operating income · $3.7B net income
- ●Operating margin: 27.4% on $17.2B in revenue.
- ●Net income margin: 21.5% — $3.7B in profit.
- ●Free cash flow: $3.2B (18.7% of revenue).
Cost / Operating Expenses
Total operating expenses $12.5B
Total
$10.9B
Capital Expenditures
$0.3B
This fiscal year (near-total AI infrastructure buildout)
Free Cash Flow
$3.2B
Trailing twelve months
Figures rounded from the annual SEC filing. Unaudited. For informational purposes only, not investment advice.
About Aon plc
Aon plc is a British-American professional services firm. The company operates through two divisions: Risk Capital, which provides brokerage and consulting services for risk management, insurance, and reinsurance, and Human Capital, which provides services related to health insurance, retirement plans, pension plans, and talent advisory.
Aon plc Market Cap History (2026–2026)
Aon plc vs Sector Peers by Market Cap
Compare Aon plc
Ranking History
| Year | Market Cap | Rank | YoY Change |
|---|---|---|---|
| 2026 | $59.0B | #237(↓54) | -21.6% |
| 2025 | $75.2B | #183(↓16) | -1.2% |
| 2024 | $76.0B | #167(↑4) | +24.5% |
| 2023 | $61.1B | #171(↓29) | -2.3% |
| 2022 | $62.5B | #142(↑18) | +0.6% |
| 2021 | $62.2B | #160(↑32) | +43.4% |
| 2020 | $43.4B | #192(↓21) | +2.4% |
| 2019 | $42.4B | #171(↑19) | +44.7% |
| 2018 | $29.3B | #190(↑20) | +9.9% |
| 2017 | $26.6B | #210(↓9) | +21.5% |
| 2016 | $21.9B | #201(↑10) | +22.5% |
| 2015 | $17.9B | #211(↓7) | -1.6% |
| 2014 | $18.2B | #204(↓3) | +14.3% |
| 2013 | $15.9B | #201(↑4) | +52.5% |
| 2012 | $10.4B | #205(↓6) | +20.3% |
| 2011 | $8.7B | #199(↑17) | +3.0% |
| 2010 | $8.4B | #216(↓5) | +21.8% |
| 2009 | $6.9B | #211(↓55) | -14.8% |
| 2008 | $8.1B | #156(↑44) | -2.9% |
| 2007 | $8.4B | #200(↑10) | +37.0% |
| 2006 | $6.1B | #210(↓12) | -0.1% |
| 2005 | $6.1B | #198(↑11) | +54.3% |
| 2004 | $4.0B | #209(↓19) | +2.1% |
| 2003 | $3.9B | #190(↓3) | +30.4% |
| 2002 | $3.0B | #187(↓35) | -45.1% |
| 2001 | $5.4B | #152(↓6) | +6.3% |
| 2000 | $5.1B | #146(↓45) | -12.0% |
| 1999 | $5.8B | #101(↓8) | +10.7% |
| 1998 | $5.2B | #93(↓7) | -3.9% |
| 1997 | $5.4B | #86(↑4) | +44.6% |
| 1996 | $3.8B | #90(↓6) | +28.0% |
| 1995 | $2.9B | #84(↓2) | +61.6% |
| 1994 | $1.8B | #82 |
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FAQ
What is Aon plc's market cap?
Aon plc (AON) has a market capitalization of $59.0B, making it the #237 largest company in the world by market cap.
What was Aon plc's highest market cap?
Aon plc's all-time high market cap was $81.4B, reached in 2026-07-28. Its highest rank was #167 in 2024.
What sector is Aon plc in?
Aon plc is in the Financial Services sector, specifically the Insurance Brokers industry. It is based in Ireland.
How has Aon plc's market cap changed over time?
Aon plc has been tracked since 2026. Its market cap has grown by 0% from $59.0B in 2026 to $59.0B today.