Arthur J. Gallagher (AJG) vs Aon (AON)
Head-to-head comparison of performance, valuation, growth, profitability and dividends. Prices delayed 15 minutes; data as of Oct 8, 2026.
Summary
Aon (AON) has outperformed Arthur J. Gallagher (AJG) over the past year, losing 26.3% versus a loss of 26.7%. Over five years, AJG leads with a +39.4% price change compared with -12.6% for AON. Arthur J. Gallagher is the larger company by market cap ($58.49 billion vs $57.61 billion), about 1.0 times the size.
On valuation, Aon trades at a lower forward P/E (13.4x vs 15.4x for Arthur J. Gallagher). Arthur J. Gallagher offers the higher dividend yield (1.18% vs 1.12%). Aon converts more of its revenue into profit, with a net margin of 21.5% versus 10.7%.
Summary generated from market data by MetaCap's automated system. Methodology
Relative performance
Percent change in share price from the first common trading day shown; excludes dividends.
Head-to-head
| Metric | AJG | AON |
|---|---|---|
| Share price | $228.19 | $271.57 |
| Market cap | $58.49B | $57.61B |
| 1-day change | +0.48% | +0.41% |
| YTD return | -12.25% | -23.35% |
| 1-year return | -26.70% | -26.29% |
| 5-year return | +39.43% | -12.55% |
| P/E ratio (TTM) | 37.84 | 14.97 |
| Forward P/E | 15.41 | 13.42 |
| EPS (TTM) | $6.03 | $18.14 |
| Dividend yield | 1.18% | 1.12% |
| Annual dividend | $2.70 | $3.06 |
| Revenue (latest FY) | $13.94B | $17.18B |
| Revenue growth (YoY) | +20.66% | +9.45% |
| Net income (latest FY) | $1.49B | $3.69B |
| Operating margin | — | 25.28% |
| Net margin | 10.72% | 21.51% |
| 52-week high | $307.11 | $382.34 |
| 52-week low | $190.75 | $266.33 |
| Distance from 52-week high | -25.70% | -28.97% |
| Analyst consensus | buy | buy |
| Avg. price target upside | +25.77% | +35.76% |
| Average volume | 1.39M | 1.55M |
| Shares outstanding | 256.34M | 212.13M |
| Employees | 67,456 | 60,000 |
| Sector | Finance | Finance |
| Industry | Specialty Insurers | Specialty Insurers |
Highlighted cells mark the higher value for growth, returns, margins and yield, and the lower value for P/E ratios. Highlighting is a mechanical comparison, not a recommendation.
Key differences
- Arthur J. Gallagher trades at a higher earnings multiple (37.8x vs 15.0x trailing P/E).
- Aon is more profitable, keeping 21.5 cents of every revenue dollar as net income versus 10.7 cents for Arthur J. Gallagher.
- Arthur J. Gallagher grew revenue faster in its latest fiscal year (+20.66% vs +9.45%).
About Arthur J. Gallagher
AJG stock →Arthur J. Gallagher & Co., together with its subsidiaries, provides insurance and reinsurance brokerage, consulting, and third-party property/casualty claims settlement and administration services to entities and individuals worldwide.
Finance · Specialty Insurers · 67,456 employees
About Aon
AON stock →Aon plc operates as a professional services firm in the United States, rest of the Americas, the United Kingdom, Ireland, rest of Europe, the Middle East, Africa, and the Asia Pacific. It operates through Risk Capital and Human Capital segments.
Finance · Specialty Insurers · 60,000 employees
AJG vs AON FAQ
Which is bigger, Arthur J. Gallagher or Aon?
Arthur J. Gallagher (AJG) is larger, with a market capitalization of $58.49B compared with $57.61B for Aon (AON).
Which stock has performed better over the past year, AJG or AON?
AON returned -26.29% over the past 12 months, compared with -26.70% for AJG (price return, excluding dividends). Past performance does not predict future results.
Which has the lower P/E ratio, AJG or AON?
AON has the lower trailing P/E at 15.0, versus 37.8 for AJG. A lower P/E is not by itself a sign of a better investment; it can reflect slower expected growth or higher risk.
Which pays a higher dividend, Arthur J. Gallagher or Aon?
Arthur J. Gallagher has the higher yield at 1.18%, compared with 1.12% for Aon.
Are Arthur J. Gallagher and Aon in the same industry?
Yes. Both are classified in the Specialty Insurers industry within the Finance sector.