AJG vs MRSH: Which Is the Better Buy in 2026?
Last updated August 2026
Short answer
AJG (Arthur J. Gallagher) and MRSH (Marsh) share investment themes but are different businesses. The right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme.
AJG vs MRSH: the tie-breaker metrics
Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.
| Metric | AJG | MRSH | What it tells you |
|---|---|---|---|
| Forward P/E | 16.78 | 16.63 | Valuation on next year's expected earnings, the same yardstick for both. Lower is cheaper for that growth; higher means the market is paying up. |
| Trailing P/E | 41.29 | 23.16 | Valuation on the last 12 months. A big drop from trailing to forward means the market expects earnings to jump, so more growth is already in the price. |
| Beta | 0.51 | 0.60 | Volatility vs the market. Above 1 swings harder than the index; below 1 is steadier. Higher beta means bigger drawdowns to hold through. |
| Price vs 52-week range | 48% of range | 58% of range | Where today's price sits between the 52-week low and high. Near the high is momentum with less margin of safety; near the low is out of favor or a discount, depending on why. |
| Price / book | 2.70 | 5.97 | How much you pay over book value. Very high can signal an asset-light, high-return business or a rich price. |
Before you buy: how AJG and MRSH affect your concentration
The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. AJG and MRSH share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.
This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined AJG and MRSH exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.
What does Arthur J. Gallagher (AJG) do?
Arthur J. Gallagher & Co. is a global insurance brokerage, risk management, and consulting firm, ranking as the third-largest publicly traded insurance broker behind Marsh & McLennan and Aon. Its Brokerage segment places property, casualty, employee benefits, wholesale, and reinsurance coverage for businesses and institutions, earning commissions and fees, while its Risk Management segment (Gallagher Bassett) handles third-party claims administration. The company runs an asset-light, fee-and-commission model that generates strong free cash flow, and it has built a decades-long track record of growing by acquiring smaller regional brokers and folding them into its platform.
What does Marsh (MRSH) do?
Marsh (ticker MRSH, formerly Marsh & McLennan Companies under MMC) is a global professional services firm built around two segments. Risk and Insurance Services houses Marsh, the world's largest insurance brokerage, and Guy Carpenter, a leading reinsurance broker. The Consulting segment houses Mercer, a large health, wealth, and career consultancy, and Oliver Wyman, a management consulting brand. Together these businesses employ roughly 90,000 people and generate the bulk of revenue from recurring commissions and advisory fees tied to commercial insurance placement, reinsurance, retirement, and workforce advisory work.
AJG vs MRSH: how do they differ?
Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.
- AJG drivers: Acquisition-led compounding; AssuredPartners integration and synergies.
- MRSH drivers: Insurance brokerage scale and pricing cycle; Diversified consulting through Mercer and Oliver Wyman.
Which fits which kind of investor
A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: The most cited concern is valuation, as AJG often trades at a large premium to the broader insurance sector and to some peers, leaving little room for disappointment. For MRSH, as an insurance broker, revenue is tied to the commercial insurance pricing cycle, and a prolonged soft market with falling premium rates would slow commission growth.
AJG or MRSH: which should you pick?
AJG vs MRSH: the full fundamentals
AJG. AJG reported roughly 28% total revenue growth in Q1 2026, blending about 5% organic growth with large contributions from acquisitions including AssuredPartners. The stock's trailing P/E in the mid-30s to around 40x sits well above the broader insurance industry average, a premium the market has historically assigned to its consistency. Forward multiples look lower on expected earnings growth, but the shares clearly price in continued execution.
MRSH. Marsh generated roughly $27 billion in trailing revenue with high-single-digit organic growth and expanding adjusted margins. It trades around a low-20s price to earnings multiple, a premium that reflects its recurring fee revenue and steady compounding rather than rapid growth. The next quarterly report is expected in late July 2026.
Headline figures (approximate, July 2026): AJG shows market cap ~$56 billion, revenue (ttm) ~$13 billion, q1 2026 revenue ~$4.76 billion, q1 2026 adjusted eps ~$4.47; MRSH shows revenue (ttm) ~$27.5B, net income (ttm) ~$4.2B, diluted eps (ttm) ~$7.99, market cap ~$86B.
The bottom line: AJG vs MRSH
AJG and MRSH are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined AJG and MRSH exposure against your real portfolio. It is not an investment adviser.
Wondering how AJG or MRSH fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in Arthur J. Gallagher with AI
Connect the broker you already use and ask Walnut's AI how AJG fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is the difference between AJG and MRSH?
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Arthur J. Marsh (ticker MRSH, formerly Marsh & McLennan Companies under MMC) is a global professional services firm built around two segments. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is AJG or MRSH the better stock?
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Neither is universally better; they suit different views and risk levels. Walnut is informational, not investment advice. Compare what each does, the tie-breaker metrics above, and the risks, then decide which fits your thesis and what you already own.
Which is cheaper, AJG or MRSH?
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On forward P/E (as of August 2026), AJG trades at 16.78x and MRSH at 16.63x, so MRSH is the cheaper of the two on next year's expected earnings. A lower multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is compounding.
Should you own both AJG and MRSH?
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Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both, and whether adding either over-concentrates you, before you buy.
What are the risks of AJG vs MRSH?
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AJG: The most cited concern is valuation, as AJG often trades at a large premium to the broader insurance sector and to some peers, leaving little room for disappointment. Larger acquisitions such as AssuredPartners carry integration, cultural, and technology-system risk that could delay synergies. Softening property insurance pricing could trim organic growth by up to about a percentage point if it continues. Regulatory scrutiny is a growing factor, including Department of Justice attention to roll-up M&A strategies and new federal rules requiring more granular disclosure of broker commissions. Benefits-related exposure to Medicare Advantage payment rates and general economic sensitivity of client exposures round out the risk set. MRSH: As an insurance broker, revenue is tied to the commercial insurance pricing cycle, and a prolonged soft market with falling premium rates would slow commission growth. The consulting businesses are more cyclical and can weaken when corporate clients cut discretionary project and benefits spending. The stock trades at a premium valuation (a low-20s price to earnings multiple), so disappointing organic growth or margins could compress the multiple. Large acquisitions carry integration and goodwill risk, and the firm faces professional liability and regulatory exposure across many jurisdictions. Currency swings also affect reported results given the global footprint.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell AJG or MRSH; figures are approximate and dated (as of August 2026). Verify current data before investing.