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

Same yardstick, side by side (as of October 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.

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 pressing risk is now balance sheet and integration: Aon already carries about $15.9 billion of debt against about $1.1 billion of cash, and the USI purchase adds substantial new borrowing just two years after NFP, with accretion not expected until 2028. 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. Aon has long been valued as a high-quality compounder at a premium multiple, but at about $289 it trades near 16x trailing and 14x forward earnings, a discount to its own history, after falling about 16% this year. The de-rating reflects slower recent growth, the debt load from the USI deal, and the pause in buybacks. The average analyst target is about $354, and the October 28 report is the next data point.

BRO. As of mid-October 2026 BRO traded near $69 with a market cap around $23 billion, a trailing P/E in the low 20s and a forward P/E near 14. The stock is down about 21% over a year even as reported revenue grew sharply, because that growth came from the Accession acquisition rather than organic momentum, and analysts on average rate it Hold with a mean target near $74.67. The forward multiple sits well below the trailing one because analysts expect earnings accretion from Accession, with estimates of about $4.48 of EPS for 2026 and $4.83 for 2027.

Headline figures (approximate, October 2026): AON shows revenue (ttm) ~$17.6B (Q2 2026 ~+2% YoY), net income (ttm) ~$3.9B (profit margin ~22%), operating margin (ttm) ~23%, q2 2026 eps $3.81 vs $3.80 expected; BRO shows revenue (ttm) ~$6.66 billion; Q2 2026 revenue ~$1.68 billion, up ~32% YoY (mostly Accession), net income (ttm) ~$1.19 billion; net margin ~18%, q2 2026 eps ~$1.07 adjusted, in line with ~$1.07 consensus, market cap ~$23 billion at ~$68.68 (Oct 16, 2026).

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.