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Marsh & McLennan Companies vs Aon: MRSH and AON compared
Marsh & McLennan Companies is the larger company: $6.9B of revenue in its latest quarter (Q3 2026) against $4.1B for Aon (Q3 2026). Marsh & McLennan Companies is growing faster (+8% against +3% a year earlier). Aon is more profitable, with an operating margin of 19.7% against 17.7%.
Where the money goes: MRSH and AON
Marsh & McLennan Companies (MRSH) · Q3 2026
Marsh & McLennan Companies, Q3 2026: revenue $6.9B (+8% year over year), operating margin 17.7%, net earnings $808M, operating cash flow $1.5B. The chart follows the revenue to costs, profit and cash.
Aon (AON) · Q3 2026
Aon, Q3 2026: revenue $4.1B (+3% year over year), operating margin 19.7%, net earnings $476M, operating cash flow $1.2B. The chart follows the revenue to costs, profit and cash.
| Marsh & McLennan Companies (MRSH) | Aon (AON) | |
|---|---|---|
| Latest quarter | Q3 2026 | Q3 2026 |
| Revenue | $6.9B | $4.1B |
| Revenue growth, Y/Y | +8% | +3% |
| Operating margin | 17.7% | 19.7% |
| Net earnings | $808M | $476M |
| Net margin | 11.8% | 11.6% |
| Operating cash flow | $1.5B | $1.2B |
| Free cash flow | $1.4B | $1.1B |
| Market value | $98.1B | $73.4B |
| P/E | 24.5× | 18.9× |
| Analysts’ mean target | $206.62 | $363.21 |
Questions
Which is bigger, Marsh & McLennan Companies or Aon?
Marsh & McLennan Companies is the larger company: $6.9B of revenue in its latest quarter (Q3 2026) against $4.1B for Aon (Q3 2026).
Is Marsh & McLennan Companies or Aon growing faster?
Marsh & McLennan Companies is growing faster (+8% against +3% a year earlier).
Which is more profitable, Marsh & McLennan Companies or Aon?
Aon is more profitable, with an operating margin of 19.7% against 17.7%.
More: Marsh & McLennan Companies earnings · how Marsh & McLennan Companies makes money · Aon earnings · how Aon makes money
From the companies' latest 10-Q, 10-K or earnings release (10-Q filed Oct 15, 2026; 10-Q filed Oct 28, 2026). Fiscal quarters can end on different dates. Not investment advice.