AON vs MRSH vs AJG Stock Comparison

Aon, Marsh & Mclennan Companies and Arthur J. Gallagher Prices as of Oct 23, 2026 Peers: Industry group
AON Aon plc
$303.56 +7.8% 1M -11.1% 1Y
Market cap
$64.41B
P/E
16.5x
Revenue (TTM)
$17.58B
Div. yield
0.01%
Insurance Brokers Financial Services
6 wins
AJG Arthur J. Gallagher & Co.
$268.07 +16.8% 1M -5.1% 1Y
Market cap
$68.41B
P/E
43.6x
Revenue (TTM)
$15.75B
Div. yield
0.01%
Insurance Brokers Financial Services
2 wins

Head to Head

12 decided of 12

Aon leads on 6 of the 12 questions below (Aon 6, Marsh & Mclennan Companies 4, Arthur J. Gallagher 2). Which ones matter depends on what you are buying for; a cheap multiple and slow growth often come together.

QuestionAONMRSHAJGLeader
Larger companyMarket capitalisation $64.41B $92.63B $68.41B MRSH
Cheaper on earningsLower P/E, profitable companies only 16.5x 22.9x 43.6x AON
Cheaper on forward earningsLower price / next fiscal year consensus EPS 16.7x 19.4x 19.5x AON
Faster revenue growthRevenue growth, trailing twelve months +4.9% +7.6% +26.3% AJG
More profitableNet margin, trailing twelve months 22.3% 14.2% 10.0% AON
Better return on capitalReturn on invested capital 14.8% 13.1% 5.7% AON
Less leveragedLower net debt / EBITDA 2.5x 2.7x 3.0x AON
Higher dividend yieldTrailing dividend yield 0.01% 0.02% 0.01% MRSH
Better 1-year returnPrice return, last 12 months -11.1% +5.0% -5.1% MRSH
Better 5-year returnAnnualised price return, 5 years -1.1%/yr +3.1%/yr +10.2%/yr AJG
Less volatileAnnualised volatility, 1 year 29.2% 25.8% 32.6% MRSH
Higher overall scoreMean of the five percentile scores vs peers 41/100 35/100 25/100 AON

Percentile Scorecard

AONMRSHAJG

Each axis is the mean percentile of its metrics against the company's industry group. 100 is the best in the group, 50 the middle.

Scores by Axis

AxisAONMRSHAJG
Valuation 11 #106 of 119 9 #108 of 119 5 #113 of 119
Growth 47 #63 of 117 16 #99 of 117 47 #62 of 117
Profitability 87 #16 of 117 77 #28 of 117 35 #77 of 117
Financial Health 7 #110 of 118 21 #94 of 118 10 #106 of 118
Shareholder Returns 53 #51 of 108 55 #49 of 108 27 #79 of 108
Overall 41 35 25
  • AON ranked among 126 companies in Insurance
  • MRSH ranked among 126 companies in Insurance
  • AJG ranked among 126 companies in Insurance

Price Performance

Price return, split-adjusted, before dividends. Click a name to hide or show it.

Returns

PeriodAONMRSHAJGSPY
1 month +7.8%+15.9%+16.8% -1.0%
3 months -16.1%+9.3%+8.2% +2.9%
6 months -5.5%+16.1%+24.5% +6.4%
Year to date -14.0%+6.5%+3.6% +11.4%
1 year -11.1%+5.0%-5.1% +13.1%
3 years -5.1%+4.5%+15.9% +79.4%
3 years, per year -1.7%+1.5%+5.1% +21.5%
5 years -5.4%+16.5%+62.3% +67.7%
5 years, per year -1.1%+3.1%+10.2% +10.9%
10 years +177.1%+203.7%+447.4% +255.2%
10 years, per year +10.7%+11.8%+18.5% +13.5%

Risk

MeasureAONMRSHAJGSPY
Volatility, 1Y 29.2%25.8%32.6% 12.7%
Downside volatility, 1Y 30.9%24.8%32.9% 12.7%
Beta vs S&P 500, 1Y -0.31-0.37-0.38 1.00
Return / volatility, 1Y -0.380.19-0.16 1.03
Max drawdown, 5Y -34.2%-35.6%-44.9% -25.4%
From 52-week high -20.3%-0.9%-5.1% -2.5%
52-week high $381.11$199.34$282.49 $779.14
52-week low $269.45$157.32$192.00 $631.97

Valuation History

Weekly multiples on trailing twelve-month fundamentals. Negative or extreme readings (a loss year, a collapsed denominator) are left out so the chart stays readable.

MultipleAONMRSHAJG
P/E now vs peer median 16.5xmedian 10.5x 23.3xmedian 10.5x 43.8xmedian 10.5x
P/S now vs peer median 3.7xmedian 1.4x 3.3xmedian 1.4x 4.4xmedian 1.4x
EV/EBITDA now vs peer median 14.1xmedian 8.0x 16.1xmedian 8.0x 20.3xmedian 8.0x
P/FCF now vs peer median 19.8xmedian 8.4x 22.6xmedian 8.4x 30.1xmedian 8.4x
P/B now vs peer median 6.6xmedian 1.5x 6.3xmedian 1.5x 2.9xmedian 1.5x
PEG now vs peer median 1.36median 0.47 3.48median 0.47 7.17median 0.47

Financial History

Reported figures by fiscal period, placed on the calendar year (or quarter) each period ended in, so companies with different fiscal years line up.

Trailing twelve monthsAONMRSHAJG
Revenue $17.58B $28.46B $15.75B
Operating income $4.65B $6.09B –
Net income $3.99B $4.12B $1.57B
Free cash flow $3.25B $4.15B $2.29B
EPS (diluted) $18.30 $8.44 $6.07
Cash & equivalents $1.06B $1.84B $1.39B
Total debt $63.71B $20.53B $27.42B
Shares (diluted) 213.90M 479.00M 258.70M
Enterprise value $57.63B $84.79B $62.81B

All Metrics

58 metrics · best in bold

Bold marks the best reading: the lowest positive value for multiples, leverage and payout, the highest for everything else. The bar under each value is its percentile against that company's own peers. Hover a value for its rank and the peer median.

Valuation

12 metrics
MetricAONMRSHAJG
P/E 16.5x 23.3x 43.8x
P/FCF 19.8x 22.6x 30.1x
P/Operating cash flow 18.2x 21.0x 28.1x
P/S 3.7x 3.3x 4.4x
P/B 6.6x 6.3x 2.9x
P/Tangible book 16.0x 9.0x 5.1x
EV/EBITDA 14.1x 16.1x 20.3x
EV/EBIT 16.8x 18.5x 30.7x
EV/Revenue 4.4x 4.0x 5.1x
EV/FCF 24.0x 27.1x 35.4x
EV/Operating cash flow 22.1x 25.1x 33.0x
PEG (3Y EPS CAGR) 1.36 3.48 7.17

Growth

14 metrics
MetricAONMRSHAJG
Revenue growth (1Y) 4.9% 7.6% 26.3%
Revenue CAGR (3Y) 10.9% 8.6% 19.6%
Gross profit growth (1Y) – – –
Gross profit CAGR (3Y) – – –
Operating income growth (1Y) 15.4% -1.0% –
Operating income CAGR (3Y) 5.9% 7.8% –
Net income growth (1Y) 49.7% -1.9% -4.5%
Net income CAGR (3Y) 13.4% 5.5% 12.2%
EPS growth (1Y) 52.8% 1.0% -3.8%
EPS CAGR (3Y) 12.2% 6.7% 6.1%
Operating cash flow growth (1Y) 12.1% -12.1% 15.4%
Operating cash flow CAGR (3Y) 3.1% 4.0% 13.2%
Free cash flow growth (1Y) 11.5% -13.9% 15.8%
Free cash flow CAGR (3Y) 3.3% 5.1% 14.8%

Profitability

14 metrics
MetricAONMRSHAJG
Gross margin – – –
EBITDA margin 31.6% 24.6% 25.2%
Operating margin 26.5% 21.4% –
Pretax margin 28.9% 18.9% 12.6%
Net margin 22.3% 14.2% 10.0%
FCF margin 18.5% 14.6% 14.5%
Operating cash flow margin 20.1% 15.7% 15.5%
Return on equity 40.6% 27.2% 6.6%
Return on assets 7.6% 6.9% 2.0%
Return on invested capital 14.8% 13.1% 5.7%
Return on capital employed 18.5% 16.2% 7.1%
Asset turnover 0.3x 0.5x 0.2x
Cash conversion (OCF / net income) 0.9x 1.1x 1.6x
Stock comp / revenue 2.1% 1.5% 1.0%

Financial Health

11 metrics
MetricAONMRSHAJG
Debt / assets 28.1% 34.3% 16.5%
Debt / equity 1.5x 1.4x 0.6x
Net debt / EBITDA 2.5x 2.7x 3.0x
Debt / FCF 4.6x 4.9x 5.9x
Liabilities / assets 81.8% 75.1% 71.0%
Equity / assets 18.2% 24.9% 29.0%
Interest coverage 6.2x 6.3x 4.1x
Current ratio 1.0x 1.1x 1.1x
Quick ratio 0.3x 0.5x 0.2x
Cash ratio 0.0x 0.1x 0.0x
Altman Z-score 1.52 2.79 1.15

Shareholder Returns

7 metrics
MetricAONMRSHAJG
Dividend yield 1.0% 1.9% 1.0%
Net buyback yield 2.4% 3.1% 0.4%
Shareholder yield 3.4% 5.0% 1.4%
Payout ratio (earnings) 16.5% 43.6% 44.0%
Payout ratio (FCF) 20.3% 43.3% 30.3%
Dividend growth (1Y) 9.5% 8.4% 16.3%
Dividend CAGR (3Y) 11.5% 13.1% 15.4%

Analyst Estimates

Solid lines are reported fiscal-year results; dashed lines are the consensus for the years ahead. Hover a year for the analysts' high and low, and how each result compared with its estimate.

ConsensusAONMRSHAJG
Forward P/E 16.7xFY2026 19.4xFY2026 19.5xFY2026
EPS, next fiscal year $18.15FY2026 $10.20FY2026 $13.76FY2026
EPS growth, next FY +6.3%FY2026 +4.6%FY2026 +28.7%FY2026
EPS growth, the year after +8.1% +15.5% +13.3%
Revenue, next fiscal year $19.12BFY2026 $30.19BFY2026 $17.07BFY2026
Revenue growth, next FY +11.3%FY2026 +11.9%FY2026 +23.9%FY2026
Revenue growth, the year after +8.7% +6.5% +0.7%

Institutional Ownership

13F filings, quarter ended Jun 30, 2026
HoldersAONMRSHAJG
Held by institutions 90.5% 93.9% 93.0%
Institutions holding 1,254 1,496 1,290
Change in shares held, QoQ +3.1% +2.8% +4.0%
Institutions buying 603 624 621
Institutions selling 448 652 483
Buyers to sellers 1.35 0.96 1.29

Return Correlation

Daily returns, last 12 months

1.00 means two stocks move in lockstep, 0 that they move independently. Pairs below about 0.5 diversify each other.

AONMRSHAJG
AON 1.00 0.80 0.76
MRSH 0.80 1.00 0.81
AJG 0.76 0.81 1.00

Add a Peer

Largest companies in the same industry

Related Comparisons

Frequently Asked Questions

Which is bigger, AON, MRSH and AJG?

Marsh & Mclennan Companies (MRSH) is the largest by market capitalisation: Aon (AON) $64.41B, Marsh & Mclennan Companies (MRSH) $92.63B, Arthur J. Gallagher (AJG) $68.41B.

Which stock is cheaper, AON, MRSH and AJG?

Aon (AON) trades on the lowest price-to-earnings ratio (Aon (AON) 16.5x, Marsh & Mclennan Companies (MRSH) 22.9x, Arthur J. Gallagher (AJG) 43.6x). On next year's consensus earnings, Aon (AON) is cheapest (Aon (AON) 16.7x, Marsh & Mclennan Companies (MRSH) 19.4x, Arthur J. Gallagher (AJG) 19.5x). A lower multiple can reflect slower expected growth, so read it next to the growth figures.

Which company is growing faster?

Arthur J. Gallagher (AJG) grew revenue fastest over the trailing twelve months: Aon (AON) +4.9%, Marsh & Mclennan Companies (MRSH) +7.6%, Arthur J. Gallagher (AJG) +26.3%.

Which company is more profitable?

Aon (AON) has the highest net margin (Aon (AON) 22.3%, Marsh & Mclennan Companies (MRSH) 14.2%, Arthur J. Gallagher (AJG) 10.0%). On return on invested capital, Aon (AON) leads (Aon (AON) 14.8%, Marsh & Mclennan Companies (MRSH) 13.1%, Arthur J. Gallagher (AJG) 5.7%).

Which stock has performed better?

Over the past year Marsh & Mclennan Companies (MRSH) returned the most: Aon (AON) -11.1%, Marsh & Mclennan Companies (MRSH) +5.0%, Arthur J. Gallagher (AJG) -5.1%. Over five years, Arthur J. Gallagher (AJG) compounded fastest (Aon (AON) -1.1%/yr, Marsh & Mclennan Companies (MRSH) +3.1%/yr, Arthur J. Gallagher (AJG) +10.2%/yr). Returns are price only, before dividends.

Which pays a higher dividend?

Marsh & Mclennan Companies (MRSH) has the highest dividend yield: Aon (AON) 0.01%, Marsh & Mclennan Companies (MRSH) 0.02%, Arthur J. Gallagher (AJG) 0.01%.

Which stock is riskier?

By one-year price volatility, Marsh & Mclennan Companies (MRSH) has been the steadiest (Aon (AON) 29.2%, Marsh & Mclennan Companies (MRSH) 25.8%, Arthur J. Gallagher (AJG) 32.6%). Volatility measures how widely the price swings, not the risk of the business.

Which is the better stock, AON, MRSH and AJG?

There is no single answer; it depends on what you are buying for. On the 12 head-to-head measures on this page, Aon (AON) leads on 6. Business Quant does not give investment advice; use the comparison as a starting point for your own research.

Data from SEC filings, exchange prices and consensus estimates, via Business Quant. Percentile scores compare each company with its own peer group, so two companies' scores are each relative to different peers unless you rank against the whole market. Price returns exclude dividends. Nothing on this page is investment advice.