Is AON or MRSH cheaper?

On trailing earnings, AON is cheaper: AON trades at a 18.09 P/E and MRSH at 20.85.

Which has grown faster, AON or MRSH?

Over the past five years, MRSH grew revenue faster — AON at a 8.99% CAGR versus MRSH at 9.28%.

Does AON or MRSH pay a bigger dividend?

AON yields 0.93% and MRSH yields 2.16% based on trailing dividends and the latest price.

Is AON or MRSH more profitable?

AON runs the higher net margin — AON at 22.54% versus MRSH at 14.26%.

Which has been the better investment, AON or MRSH?

Over the past 10-year, AON delivered the higher annualized total return — AON at 13.07% versus MRSH at 11.57%. Past performance doesn't predict future results.

Aon plc (AON) vs Marsh & McLennan Companies, Inc. (MRSH)

AON leads on 7 of 13 compared metrics.

A side-by-side comparison of Aon plc and Marsh & McLennan Companies, Inc. across valuation, profitability, dividends, and growth — built entirely from reported fundamentals, as of June 16, 2026. The ● marks the stronger figure on each row (cheaper multiple, higher margin/return).

AON

Aon plc

$71.04B

$329.51Financial Services

MRSH

Marsh & McLennan Companies, Inc.

$80.35B

$166.78Financial Services

Total return — AON vs MRSH

growth of $100 · last 30y

AON +1374.8%MRSH +947.6%AON compounded faster

AON MRSH

AON vs MRSH: by the numbers

•MRSH is the larger company ($80.35B vs $71.04B market cap).
•AON trades at the lower earnings multiple (18.09 vs 20.85 P/E).
•AON converts more revenue to profit (22.54% vs 14.26% net margin).
•MRSH grew revenue faster over the past five years (9.28% vs 8.99% CAGR).
•MRSH pays the higher dividend yield (2.16% vs 0.93%).

Which is better, AON or MRSH?

Metric tally: AON 7 · MRSH 6

It depends on what you're optimizing for:

ValueAON(lower P/E)

GrowthMRSH(faster 5Y revenue CAGR)

IncomeMRSH(higher dividend yield)

Metrics side by side

Valuation

Metric	AON	MRSH
P/E ratio	18.09●	20.85
Forward P/E	17.21	16.03●
P/S ratio	4.06	2.95●
P/B ratio	7.22	5.56●
PEG ratio	0.56●	7.79

Profitability

Metric	AON	MRSH
Gross margin	65.98%●	42.37%
Operating margin	27.56%●	21.70%
Net margin	22.54%●	14.26%
ROE	40.09%●	26.94%
ROIC	12.16%	12.12%

Dividends

Metric	AON	MRSH
Dividend yield	0.93%	2.16%●
Payout ratio	17.83%	42.45%

Growth (annualized)

Metric	AON	MRSH
Revenue CAGR (5Y)	8.99%	9.28%●
EPS CAGR (5Y)	15.07%	16.34%●
Total return CAGR (5Y)	7.25%●	5.19%

Frequently asked

Which is better, AON or MRSH?: It depends on your goal. value: AON (lower P/E); growth: MRSH (faster 5Y revenue CAGR); income: MRSH (higher dividend yield). Across all compared metrics, AON leads 7 to 6.
Is AON or MRSH cheaper?: On trailing earnings, AON is cheaper: AON trades at a 18.09 P/E and MRSH at 20.85.
Which has grown faster, AON or MRSH?: Over the past five years, MRSH grew revenue faster — AON at a 8.99% CAGR versus MRSH at 9.28%.
Does AON or MRSH pay a bigger dividend?: AON yields 0.93% and MRSH yields 2.16% based on trailing dividends and the latest price.
Is AON or MRSH more profitable?: AON runs the higher net margin — AON at 22.54% versus MRSH at 14.26%.
Which has been the better investment, AON or MRSH?: Over the past 10-year, AON delivered the higher annualized total return — AON at 13.07% versus MRSH at 11.57%. Past performance doesn't predict future results.

Go deeper

Full AON analysis Full MRSH analysis Interactive comparison tool

Dig into the metrics

Aon P/E ratio Marsh & McLennan Companies P/E ratio Aon dividend yield Marsh & McLennan Companies dividend yield Aon ROE Marsh & McLennan Companies ROE Aon operating margin Marsh & McLennan Companies operating margin Aon revenue growth Marsh & McLennan Companies revenue growth Aon free cash flow Marsh & McLennan Companies free cash flow

Aon & Marsh & McLennan Companies appear in these rankings

Highest Dividend Yield Stocks Highest ROE Stocks Highest FCF Yield Stocks Best 10-Year Total Return Stocks

Figures are sourced from reported fundamentals and the latest end-of-day price. This comparison is informational only and is not investment advice. Past performance does not predict future results. See our methodology. Compiled by TGMCharts Research · data verified June 16, 2026.