Aon vs Marsh McLennan (AON vs MMC)
Aon (AON) vs Marsh McLennan (MMC) in plain English: P/E, growth, margins, debt and dividend side by side, key differences and which fits each investor profile.
Aon (AON) and Marsh McLennan (MMC) compete in insurance. Here are Aon and Marsh McLennan side by side with their real figures as of November 4, 2026: what sets them apart, which fits each kind of investor and the most common questions, without telling you whether to buy Aon or Marsh McLennan.
Aon vs Marsh McLennan: the figures
| Figure | Aon | Marsh McLennan |
|---|---|---|
| Share price | $344.67 (November 4, 2026) | N/A |
| Market cap | $73.1 billion | N/A |
| P/E (TTM) | 18.9x | N/A |
| Forward P/E | 17.1x | N/A |
| Revenue growth (quarter) | +2.6% | N/A |
| Net margin (TTM) | 22.2% | N/A |
| ROE | 43.4% | N/A |
| Dividend yield | 0.99% | N/A |
| Beta | 0.61 | N/A |
Aon and Marsh McLennan figures from Yahoo Finance, the same source the Fintols analysis uses, retrieved on November 4, 2026; N/A means that Aon or Marsh McLennan figure is not available, and we never estimate it.
How Aon and Marsh McLennan make money
Aon (AON)
Aon is a broker, not an insurer: it earns commissions and fees for advising clients and placing their coverage. Its revenue lines include Commercial Risk Solutions, the largest, Reinsurance Solutions, Health Solutions for employee benefits, and Wealth Solutions for retirement plans, serving companies in the Americas, Europe and Asia. Full Aon analysis.
Marsh McLennan (MMC)
Marsh McLennan earns commissions and fees from insurance brokerage and consulting. Risk and Insurance Services, the larger segment, includes broker Marsh and reinsurance broker Guy Carpenter, while Consulting houses Mercer, which advises on HR, benefits and pensions, and Oliver Wyman, a management consulting firm. Full Marsh McLennan analysis.
Frequently asked questions: Aon vs Marsh McLennan
Is Aon or Marsh McLennan the better stock?
Choosing between Aon and Marsh McLennan depends on what you are looking for. Each has different strengths. Fintols does not tell you whether to buy Aon or Marsh McLennan: it shows you the differences so you can decide.
Can I own both Aon and Marsh McLennan?
Yes. Many people spread their money across several companies, such as Aon and Marsh McLennan, or use index funds so they do not depend on just one. If you are starting out, decide how much you want to invest and for how long before buying Aon or Marsh McLennan.
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