Which has the lower trailing P/E, AJG or AON?

AON has the lower trailing P/E: AJG trades at 43.68 and AON at 19.57. P/E is one valuation measure and does not by itself establish which business is cheaper.

Which has grown faster, AJG or AON?

Over the past five years, AJG grew revenue faster — AJG at a 15.54% CAGR versus AON at 8.37%.

Does AJG or AON pay a bigger dividend?

AJG yields 1.02% and AON yields 0.88% based on trailing dividends and the latest price.

Is AJG or AON more profitable?

AON runs the higher net margin — AJG at 9.96% versus AON at 22.27%.

How have AJG and AON total returns compared?

Over the past 10 years, AJG delivered 20.36% and AON delivered 13.63% annualized total return. Past performance doesn't predict future results.

Arthur J. Gallagher & Co. (AJG) vs Aon plc (AON)

A side-by-side comparison of Arthur J. Gallagher & Co. and Aon plc across valuation, profitability, dividends, and growth — built entirely from reported fundamentals, as of August 23, 2026. Differences are shown without an overall score or investment verdict.

AJG

Arthur J. Gallagher & Co.

$67.77B

$263.81Financial ServicesAt close: Aug 21, 2026, 4:00 PM ET

AON

Aon plc

$75.33B

$355.11Financial ServicesAt close: Aug 21, 2026, 4:00 PM ET

Total return — AJG vs AON

growth of $100 · dividends reinvested · last 10y

AJG +538.2% (+20.4%/yr)AON +254.2% (+13.5%/yr)AJG compounded faster over this window

AJG AON

AJG vs AON: by the numbers

•AON is the larger company ($75.33B vs $67.77B market cap).
•AON trades at the lower trailing earnings multiple (19.57 vs 43.68 P/E), one valuation lens rather than an overall verdict.
•AON converts more revenue to profit (22.27% vs 9.96% net margin).
•AJG grew revenue faster over the past five years (15.54% vs 8.37% CAGR).
•AJG pays the higher dividend yield (1.02% vs 0.88%).

Metrics side by side

Valuation

Metric	AJG	AON
P/E ratio	43.68	19.57
Forward P/E	19.92	18.61
P/S ratio	4.33	4.34
P/B ratio	2.88	7.89

Profitability

Metric	AJG	AON
Gross margin	54.75%	47.70%
Operating margin	17.03%	27.21%
Net margin	9.96%	22.27%
ROE	6.61%	40.51%

Dividends

Metric	AJG	AON
Dividend yield	1.02%	0.88%
Payout ratio	46.31%	18.27%

Growth (annualized)

Metric	AJG	AON
Revenue CAGR (5Y)	15.54%	8.37%
EPS CAGR (5Y)	6.33%	15.07%
Total return CAGR (5Y)	14.21%	5.76%

Frequently asked

Which has the lower trailing P/E, AJG or AON?: AON has the lower trailing P/E: AJG trades at 43.68 and AON at 19.57. P/E is one valuation measure and does not by itself establish which business is cheaper.
Which has grown faster, AJG or AON?: Over the past five years, AJG grew revenue faster — AJG at a 15.54% CAGR versus AON at 8.37%.
Does AJG or AON pay a bigger dividend?: AJG yields 1.02% and AON yields 0.88% based on trailing dividends and the latest price.
Is AJG or AON more profitable?: AON runs the higher net margin — AJG at 9.96% versus AON at 22.27%.
How have AJG and AON total returns compared?: Over the past 10 years, AJG delivered 20.36% and AON delivered 13.63% annualized total return. Past performance doesn't predict future results.

Go deeper

Full AJG analysis Full AON analysis Interactive comparison tool

Dig into the metrics

Arthur J. Gallagher P/E ratio Aon P/E ratio Arthur J. Gallagher dividend yield Aon dividend yield Arthur J. Gallagher ROE Aon ROE Arthur J. Gallagher operating margin Aon operating margin Arthur J. Gallagher revenue growth Aon revenue growth

Arthur J. Gallagher & Aon appear in these rankings

Fastest Revenue Growth Stocks Highest ROE Stocks Highest FCF Yield Stocks Highest 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 August 23, 2026.