AON vs BRO: Which Is the Better Buy in 2026?

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.

Reading it: BRO is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

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. AON and BRO 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 AON and BRO 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.

Aon plc is one of the world's leading brokers and professional-services firms in risk and human capital. It arranges insurance and reinsurance for corporate clients, advises on risk management and analytics, and provides health, benefits, retirement, and talent consulting. The company organizes its work around two broad solution lines, Risk Capital (commercial risk and reinsurance brokerage and related advisory) and Human Capital (health, benefits, wealth, and talent). Crucially, Aon is an intermediary and advisor: it earns commissions and fees rather than underwriting insurance itself, so it does not carry the catastrophe-loss risk that insurers do, which gives its revenue a recurring, relatively defensive quality.

Full AON guide

Brown & Brown is a Daytona Beach, Florida based insurance intermediary that connects businesses and individuals with insurance carriers, collecting commissions and fees instead of taking underwriting risk on its own balance sheet. It operates through two reportable segments after a 2025 reorganization, Retail and Specialty Distribution, spanning property and casualty, employee benefits, programs, and wholesale brokerage. The business is fee-based and capital-light, which historically produced high margins, strong free cash flow, and decades of dividend increases, and management has grown for years by acquiring smaller agencies and folding them into its decentralized model.

Full BRO guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• AON drivers: Steady organic growth; Margin expansion and Aon United.
• BRO drivers: Acquisition-led compounding; Fee-based, capital-light economics.

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 discussed risk is valuation: Aon trades at a premium multiple, so disappointing organic growth, margin, or integration results could compress its multiple even if the business remains sound. For BRO, the dominant near-term risk is a softening insurance-rate environment: organic growth slowed toward the mid single digits (around 3.6% in a recent quarter versus roughly 10% a year earlier) as premium rates flatten or fall across property, casualty, cyber, and executive lines, which pressures commission-based revenue.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick AON if you believe its drivers more; BRO if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the AON and BRO guides.

AON. These figures are approximate and tied to the asOf date; verify live numbers before acting. Aon is valued as a high-quality compounder, so its premium multiple reflects durable organic growth and margin expansion rather than cheapness. The key question for most investors is whether that consistency justifies the price, and whether NFP integration and organic growth keep supporting the multiple.

BRO. As of mid-July 2026 BRO traded near the high $60s with a market cap around $23 billion and a trailing P/E in the low 20s, a premium typical of high-quality insurance brokers. The 2025 revenue jump to over $5.9 billion was driven heavily by the Accession acquisition rather than organic growth, which had slowed to the mid single digits. The forward multiple sits below the trailing multiple, reflecting expected earnings accretion from a full year of Accession.

Headline figures (approximate, Jul 2026): AON shows revenue trend Mid-single-digit organic revenue growth, with total revenue boosted by the NFP acquisition, earnings direction Rising earnings per share in 2026, supported by margin expansion and buybacks, margins Adjusted operating margins in the low-30s percent, with guidance for continued basis-point expansion, business model Fee-and-commission broker and advisor; does not underwrite insurance, so revenue is recurring and defensive; BRO shows revenue (ttm) ~$7 billion, 2025 total revenue ~$5.9 billion (+~23% YoY), market cap ~$23 billion, trailing p/e ~21x.

AON and BRO 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 AON and BRO exposure against your real portfolio. It is not an investment adviser.