AON vs MRSH
As of Sep 20, 2026, Aon plc (AON) scores 5.2/10 and Marsh & McLennan Companies (MRSH) 6.3/10 on AlphaStocks' five-model composite, so MRSH scores higher. AON trades 36% below its model fair value; MRSH trades 5% above its model fair value.
AON
Aon plc
5.2
Consider Buy
$295.48
MRSH
MARSH & MCLENNAN COMPANIES, INC.
6.3
Consider Buy
$175.04
AON vs MRSH: Which is the Better Investment?
Aon plc (AON) scores 5.2/10 while MARSH & MCLENNAN COMPANIES, INC. (MRSH) scores 6.3/10 on AlphaStocks' composite model. MARSH & MCLENNAN COMPANIES, INC. has the higher composite rating of Consider Buy. On a P/E basis, Aon plc trades at 17.4x, making it the more attractively priced of the two. Aon plc trades further below its estimated fair value.
This comparison is algorithmically generated and is not financial advice.
| Metric | AON | MRSH |
|---|---|---|
| Scores & Fundamentals | ||
| Composite Score | 5.2/10 | 6.3/10▲ |
| Rating | Consider Buy | Consider Buy▲ |
| Price | $295.48 | $175.04 |
| P/E Ratio | 17.4▲ | 20.8 |
| ROE | 42.7%▲ | 15.2% |
| Market Cap | $64B | $85B |
| Fair Value | $464.73 | $166.96 |
| Dividend Yield | 0.8% | 1.9%▲ |
| Sector Rank | #172 of 265 | #92 of 265▲ |
| Model Verdicts | ||
| Piotroski | Strong | Strong |
| Buffett | Attractive | Strong▲ |
| Graham | Neutral | Neutral |
| Lynch | Neutral | Neutral |
| Greenblatt | Neutral | Attractive▲ |
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AON vs MRSH: Which Stock Scores Higher?
Aon plc (AON) and MARSH & MCLENNAN COMPANIES, INC. (MRSH) are both in the Financials sector. MRSH currently leads with a composite score of 6.3/10 (Consider Buy) compared to AON's 5.2/10 (Consider Buy).
The AlphaStocks composite score evaluates each stock across four dimensions: Quality (business strength measured by Piotroski F-Score and Buffett quality criteria), Value (discount to intrinsic worth using Graham, Lynch, and Greenblatt models), Momentum (6-month price trend), and Timing (a confirmation signal that requires both value and momentum to align). A higher composite score indicates stronger overall fundamentals combined with favorable market conditions.
This comparison uses the same scoring framework for both companies, ensuring an apples-to-apples evaluation. Scores are recalculated daily after market close using data from SEC filings and market prices. Read the full methodology to understand how each model contributes to the composite score.
Scores are algorithm-generated research tools, not investment recommendations. Past performance does not guarantee future results. Always do your own due diligence. Full disclaimer