Aon Plc (AON)
Aon Market Cap: 74.28B for Jan. 14, 2026
Market Cap Chart
Historical Data
Market Capitalization Definition
Market Capitalization measures the total value of a company based on their stock price multiplied by the shares outstanding. This metric is important because it gives you an idea of the size of a company, and how the size has changed over time. When studying companies from a relative basis, it would make sense to compare companies that have a similar market capitalization because factors like market share, economies of scale, and business models would also be similar.
Market Cap Range, Past 5 Years
Market Cap Benchmarks
| American International Group, Inc. | 39.24B |
| Marsh & McLennan Cos., Inc. | 89.51B |
| Assured Guaranty Ltd. | 3.942B |
| The Allstate Corp. | 51.03B |
| Brown & Brown, Inc. | 27.17B |
Market Cap Related Metrics
| PE Ratio | 27.68 |
| PS Ratio | 4.393 |
| PEG Ratio | 5.108 |
| Price to Book Value | 9.356 |
| Price to Free Cash Flow | 24.73 |
| Price | 345.57 |
| Earnings Yield | 3.61% |
| PEGY Ratio | 4.420 |
| Operating PE Ratio | 16.28 |
| Normalized PE Ratio | 25.66 |