Market Cap for Aon (AON)
According to Aon's latest reported financial statements, the company's latest reported market cap is $76.40B USD. Market capitalization is the total dollar value of all outstanding shares — shares outstanding × stock price — and the standard measure of a company's equity value. On this page, historical market cap snaps filing-period share counts to closing prices on or before each statement date (not intraday tick data).
Headline figure above is from the reporting period ending (reported ). Chart and table below cover the full reported history back to .
AON
Currently viewingMarket CapSwitch metric
Latest period
$76.40B
YoY change
-8.6%
5Y CAGR
+0.5%
Peak year (2025)
$76.40B
Latest annual
$69.82B
Market Cap history chart for Aon (AON) from 1985 to 2026
Market Cap history table for Aon (AON) from 1985 to 2026
| Fiscal year | Period ended | Reported | Market Cap | YoY |
|---|---|---|---|---|
| 2026 | $69.82B | -8.6% | ||
| 2025 | $76.40B | +0.1% | ||
| 2024 | $76.32B | +27.9% | ||
| 2023 | $59.66B | -6.8% | ||
| 2022 | $63.99B | -5.8% | ||
| 2021 | $67.96B | +38.0% | ||
| 2020 | $49.25B | -1.7% | ||
| 2019 | $50.11B | +39.6% | ||
| 2018 | $35.90B | +2.8% | ||
| 2017 | $34.93B | +15.9% | ||
| 2016 | $30.15B | +15.2% | ||
| 2015 | $26.17B | -7.9% | ||
| 2014 | $28.41B | +7.4% | ||
| 2013 | $26.46B | +43.1% | ||
| 2012 | $18.50B | +15.9% | ||
| 2011 | $15.95B | +16.3% | ||
| 2010 | $13.72B | +22.9% | ||
| 2009 | $11.16B | -18.8% | ||
| 2008 | $13.75B | -10.8% | ||
| 2007 | $15.40B | +27.4% | ||
| 2006 | $12.09B | -1.5% | ||
| 2005 | $12.28B | +52.9% | ||
| 2004 | $8.03B | +5.6% | ||
| 2003 | $7.61B | +40.1% | ||
| 2002 | $5.43B | -43.7% | ||
| 2001 | $9.65B | +6.4% | ||
| 2000 | $9.07B | -13.7% | ||
| 1999 | $10.51B | +9.7% | ||
| 1998 | $9.58B | -4.3% | ||
| 1997 | $10.00B | +43.1% | ||
| 1996 | $6.99B | +28.9% | ||
| 1995 | $5.42B | +59.6% | ||
| 1994 | $3.40B | -0.8% | ||
| 1993 | $3.43B | -12.0% | ||
| 1992 | $3.90B | +50.8% | ||
| 1991 | $2.58B | +12.3% | ||
| 1990 | $2.30B | -17.0% | ||
| 1989 | $2.77B | +54.4% | ||
| 1988 | $1.79B | +18.8% | ||
| 1987 | $1.51B | -13.5% | ||
| 1986 | $1.75B | +0.9% | ||
| 1985 | $1.73B | — |
Market Cap values are taken from Aon's reported income statements (10-Q quarterly and 10-K annual filings with the U.S. Securities and Exchange Commission). Each row shows the period end date and the date the filing was reported; YoY compares each figure to the same period one year earlier. Amounts are in USD as filed.
Analysis
As of the 2026 fiscal year, Aon (AON) reported market cap of $69.82B – declined 8.6% year-over-year.
Aon market cap compound annual growth for the 2021–2026 (5 years) window is +0.5%, with the latest reading among the more recent periods of the dataset.
Aon market cap declined from $76.40B in 2025 to $69.82B in 2026, a 8.6% drawdown.
Across the available history, market cap reached its high of $76.40B in 2025 and its low of $1.51B in 1987.
Aon (AON) sits 9th of 8 Financial Services peers we track on this metric, against a peer median of $413.64B.
Aon Market Cap by Year
Aon Market Cap 2026: $69.82B
Aon market cap in 2026 was $69.82B, declined 8.6% below 2025.
Aon Market Cap 2025: $76.40B
Aon market cap in 2025 was $76.40B, edged up 0.1% from 2024. This figure represents the highest annual value in the available history.
Aon Market Cap 2024: $76.32B
Aon market cap in 2024 was $76.32B, grew 27.9% from 2023.
Aon Market Cap 2023: $59.66B
Aon market cap in 2023 was $59.66B, declined 6.8% below 2022.
Aon Market Cap 2022: $63.99B
Aon market cap in 2022 was $63.99B.
See more financial history for Aon (AON).
Sector peers — Market Cap
Companies in the same sector as Aon, ranked by their latest market cap.
| Company | Market Cap | Sector |
|---|---|---|
| Berkshire Hathaway Inc. (BRK-B) | $1.03T | Financial Services |
| JPMorgan Chase & Co. (JPM) | $839.99B | Financial Services |
| Visa Inc. (V) | $596.34B | Financial Services |
| Mastercard Incorporated (MA) | $449.35B | Financial Services |
| Bank of America Corporation (BAC) | $377.92B | Financial Services |
| Morgan Stanley (MS) | $302.29B | Financial Services |
| The Goldman Sachs Group, Inc. (GS) | $274.96B | Financial Services |
| Wells Fargo & Company (WFC) | $249.74B | Financial Services |
Frequently asked questions
What is Aon's market cap?
- Latest reported market cap for Aon (AON) is $76.40B (period ending December 31, 2025).
How has Aon market cap changed year-over-year?
- Aon (AON) market cap changed -8.6% year-over-year on the latest annual filing.
What is the long-term growth rate of Aon market cap?
- Aon (AON) market cap compound annual growth rate is +0.5% over the most recent 5 years available.
When did Aon market cap hit its highest annual value?
- Aon market cap reached its highest annual value of $76.40B in 2025.
What was Aon market cap in 2025?
- Aon (AON) market cap in 2025 was $76.40B.
What was Aon market cap in 2026?
- Aon (AON) market cap in 2026 was $69.82B.
Metrics overview
Pick a metric for charts, filings, and peers — each row shows the latest TTM or annual value with year-over-year change.
Explore more
AON Overview
Company profile, financial tools, and key metrics
AON Revenue Counter
Earns $544.81 every second. See per minute, hour, and day.
AON Earnings Counter
Earns $117.17 per second net profit. See per minute, hour, and day.
AON Economic Scale
Exceeds North Macedonia's GDP. Compare with world economies.
AON What If Invested
What if you had invested $1,000? See historical returns from any date.
AON How It Makes Money
Discover visual breakdown of $17.18B in revenue — where it comes from and where it goes.
AON Stock Seasonality
Best and worst months to invest. Historical monthly returns heatmap.
AON Price Target Scenarios
Model bear, base, and bull cases with EPS growth and exit P/E — pre-filled from analysts and history.
AON Daily Price Character
Steady · 49.1% historical win rate (green days). Streaks & record days.
AON Buybacks
1.32% TTM buyback yield. Shareholder yield & SBC comparison.
AON Stock Split History
4 splits on record. Dates, ratios, and cumulative multiple.
AON Dividend Profile
Yield: 0.92%. Safety: 7/8. See full history.
AON Dividend Calculator
How much dividend income would $1,000 have earned? Calculate from any date.
AON Dividend Forecast
Project future income with DRIP, growth assumptions, and optional monthly contributions.