AON vs. MRSH: Aon vs. Marsh & McLennan Companies Stock Comparison
How do Aon (AON) and Marsh & McLennan Companies (MRSH) stack up? This page sets them side by side across company profile, performance and risk, profitability, growth, financial strength, dividends, and valuation, with selected fundamentals also measured against each stock's industry-group peers.
Company Profile
Aon (AON) and Marsh & McLennan Companies (MRSH) are both classified in the Insurance Brokers sub-industry within the broader Insurance industry, placing them in the closest GICS peer bucket.
| Profile Item | AON | MRSH |
|---|---|---|
| Name | Aon plc | Marsh & McLennan Companies, Inc. |
| Country/Region | Ireland | United States |
| GICS Sector | Financials | Financials |
| GICS Industry Group | Insurance | Insurance |
| GICS Industry | Insurance | Insurance |
| GICS Sub-Industry | Insurance Brokers | Insurance Brokers |
| Market Capitalization | 70.84 billion USD | 80.30 billion USD |
| Currency | USD | USD |
| Exchange | NYSE | NYSE |
| Listing Date | June 2, 1980 | February 21, 1973 |
| Security Type | Common Stock | Common Stock |
Price Performance
Cumulative Growth
Trailing Returns
Performance Metrics
| Metric | AON | MRSH |
|---|---|---|
| Total Return (1Y) | -6.59% | -22.31% |
Risk Profile
Drawdown History
Risk Metrics
| Metric | AON | MRSH |
|---|---|---|
| Volatility (1Y, Annualized) | 24.34% | 24.17% |
| Beta (5Y) | 0.71 | 0.61 |
| Avg. Volume (3M) | 1.56M | 2.88M |
Risk-Adjusted Performance
Risk-Return Positioning
Profitability
ROE (TTM)
Both companies show strong equity returns, but Aon (AON) at 46.45% is the standout with ROE above its industry range; Marsh & McLennan Companies (MRSH) at 27.57% also sits in the top quartile.
AON
Insurance industry group
46.45%
- AON
- 46.45%
- Max
- 38.88%
- Q3
- 22.53%
- Median
- 14.77%
- Q1
- 9.91%
- Min
- -6.23%
MRSH
Insurance industry group
27.57%
- Max
- 38.88%
- MRSH
- 27.57%
- Q3
- 22.53%
- Median
- 14.77%
- Q1
- 9.91%
- Min
- -6.23%
Net Margin (TTM)
Aon (AON) at 22.54% retains a top-quartile share of revenue as profit, ahead of Marsh & McLennan Companies (MRSH) at 14.26%, which keeps about the industry-typical share.
AON
Insurance industry group
22.54%
- Max
- 38.86%
- AON
- 22.54%
- Q3
- 19.36%
- Median
- 11.07%
- Q1
- 5.09%
- Min
- -2.80%
MRSH
Insurance industry group
14.26%
- Max
- 38.86%
- Q3
- 19.36%
- MRSH
- 14.26%
- Median
- 11.07%
- Q1
- 5.09%
- Min
- -2.80%
Operating Margin (TTM)
Neither side reports a meaningful operating margin: for Aon (AON) in Insurance and Marsh & McLennan Companies (MRSH) in Insurance, funding costs are part of the core business, so net margin and ROE are the cleaner profitability reads.
Profitability Metrics
| Metric | AON | MRSH |
|---|---|---|
| ROE (TTM) | 46.45% | 27.57% |
| ROA (TTM) | 6.05% | 7.27% |
| Net Margin (TTM) | 22.54% | 14.26% |
| Operating Margin (TTM) | -- | -- |
| Gross Margin (TTM) | -- | -- |
Growth
Revenue Growth
Revenue Growth Metrics
| Metric | AON | MRSH |
|---|---|---|
| Revenue Growth (YoY) | 9.45% | 10.32% |
| Revenue Growth (3Y CAGR) | 11.25% | 9.20% |
EPS Growth
EPS Growth Metrics
| Metric | AON | MRSH |
|---|---|---|
| EPS Growth (YoY) | 36.27% | 3.06% |
| EPS Growth (3Y CAGR) | 11.92% | 11.75% |
Financial Strength
Current Ratio (MRQ)
current ratio doesn’t apply on either side: Aon (AON) in Insurance and Marsh & McLennan Companies (MRSH) in Insurance both report balance sheets without a current/non-current split, so their short-term liquidity is better judged through regulatory and funding measures.
Debt / Equity (MRQ)
debt-to-equity ratio is set aside for both: Aon (AON) in Insurance and Marsh & McLennan Companies (MRSH) in Insurance run businesses where balance-sheet leverage is part of the model, so capital-adequacy and funding measures are the better gauges of balance-sheet risk.
Financial Strength Metrics
| Metric | AON | MRSH |
|---|---|---|
| Current Ratio (MRQ) | -- | -- |
| Debt / Equity (MRQ) | -- | -- |
| Net Debt / EBITDA | -- | -- |
Dividends
Dividend Yield (TTM)
Both Aon (AON) at 0.91% and Marsh & McLennan Companies (MRSH) at 2.16% pay solid, industry-typical yields, sitting squarely within their peers’ usual range.
AON
Insurance industry group
0.91%
- Max
- 5.58%
- Q3
- 2.46%
- Median
- 1.18%
- AON
- 0.91%
- Q1
- 0.00%
- Min
- 0.00%
MRSH
Insurance industry group
2.16%
- Max
- 5.58%
- Q3
- 2.46%
- MRSH
- 2.16%
- Median
- 1.18%
- Q1
- 0.00%
- Min
- 0.00%
Dividend Payout Ratio (TTM)
Aon (AON) at 16.36% pays out a band-typical share of earnings, while Marsh & McLennan Companies (MRSH) at 43.94% distributes more than its industry norm — less retained, thinner cover.
AON
Insurance industry group
16.36%
- Max
- 86.52%
- Q3
- 35.43%
- AON
- 16.36%
- Median
- 14.92%
- Q1
- 0.00%
- Min
- 0.00%
MRSH
Insurance industry group
43.94%
- Max
- 86.52%
- MRSH
- 43.94%
- Q3
- 35.43%
- Median
- 14.92%
- Q1
- 0.00%
- Min
- 0.00%
Dividend Metrics
| Metric | AON | MRSH |
|---|---|---|
| Dividend Yield (TTM) | 0.91% | 2.16% |
| Dividend Payout Ratio (TTM) | 16.36% | 43.94% |
Valuation
P/E Ratio (TTM)
Both Aon (AON) at 18.21 and Marsh & McLennan Companies (MRSH) at 20.83 sit in the richer earnings-multiple quartile for P/E ratio, so investors are paying more for TTM earnings than they pay for typical peers.
AON
Insurance industry group
18.21
- Max
- 28.97
- AON
- 18.21
- Q3
- 17.55
- Median
- 13.05
- Q1
- 8.85
- Min
- 3.65
MRSH
Insurance industry group
20.83
- Max
- 28.97
- MRSH
- 20.83
- Q3
- 17.55
- Median
- 13.05
- Q1
- 8.85
- Min
- 3.65
P/S Ratio (TTM)
Both Aon (AON) at 4.05 and Marsh & McLennan Companies (MRSH) at 2.92 command a richer price per dollar of sales than most peers, sitting in the upper P/S ratio quartile of their industries.
AON
Insurance industry group
4.05
- Max
- 4.36
- AON
- 4.05
- Q3
- 2.32
- Median
- 1.25
- Q1
- 0.86
- Min
- 0.09
MRSH
Insurance industry group
2.92
- Max
- 4.36
- MRSH
- 2.92
- Q3
- 2.32
- Median
- 1.25
- Q1
- 0.86
- Min
- 0.09
P/B Ratio (MRQ)
Measured against book value, both Aon (AON) at 7.20 and Marsh & McLennan Companies (MRSH) at 5.52 look expensive — each P/B ratio sits above its industry’s benchmark range.
AON
Insurance industry group
7.20
- AON
- 7.20
- Max
- 3.98
- Q3
- 2.56
- Median
- 1.75
- Q1
- 1.21
- Min
- -0.15
MRSH
Insurance industry group
5.52
- MRSH
- 5.52
- Max
- 3.98
- Q3
- 2.56
- Median
- 1.75
- Q1
- 1.21
- Min
- -0.15
Valuation Metrics
| Metric | AON | MRSH |
|---|---|---|
| P/E Ratio (TTM) | 18.21 | 20.83 |
| P/S Ratio (TTM) | 4.05 | 2.92 |
| P/B Ratio (MRQ) | 7.20 | 5.52 |
| Free Cash Flow Yield (TTM) | -- | -- |