Aon plc (AON)
Servicios financieros / Corretaje de seguros y consultoría de capital humano
Aon is a global risk brokerage and human capital consulting firm, with scale across more than 120 countries and an extremely diversified client base (the largest client accounts for barely ~1% of revenue). Return on invested capital of 15.7% comfortably clears the 10% bar, though the balance sheet carries the goodwill of decades of acquisitions —including NFP— and that should not read as poor quality. It trades near fair value: the normalized entry multiple is already at the high end of the sector band, and the thesis's margin depends on the guided margin expansion materializing.
- Price
- $357.21
- Intrinsic value (5y, base)
- $431
- Total annual return (5y)
- 5.0%
- Status (nominal)
- Fairly valued
- Margin of safety
- +2%
The essentials
- Return on invested capital of 15.7% (excellent against the 10% bar), despite negative tangible equity from the accumulated goodwill of decades of acquisitions — the serial acquirer nuance, not a sign of poor quality.
- Guidance reaffirmed on July 29, 2026: mid-single-digit or higher organic growth and 70-80 basis points of adjusted operating margin expansion, with the NFP integration substantially complete by the close of the second quarter.
- Reported growth (4.9% TTM) is temporarily depressed by the sale of NFP's Wealth business in the fourth quarter of 2025; organic growth runs at 5-6% and is the clean measure of the underlying business.
Intrinsic value — two valuation methods
Total return at 5 years: 5.0%/year = 3.8% appreciation + 1.1% dividend. The target price ($431) is ex-dividend; the $22 in dividends collected over 5 years are added separately.
By both methods, the value today (DCF $414 · Multiples $365) exceeds the market price ($357).
Pillars of the analysis
The verdict — today vs 5 years
Today — fairly valued: at $357 trades ~2.1% below its value discounted to today (~$365); the discount is positive but does not reach the margin of safety we require (≥38%).
At 5 years — En valor: the target price ($431) plus dividends yield between the 4% floor and the 10% average return — a reasonable return, though without the margin of a great investment.
The bridge: the return at 5 years exceeds the risk-free rate (4.5%) — but the discount does not reach the required margin of safety (≥38%). To require a 15% annual return, it would need to be bought at ~$229.
Thesis
The business
Aon is a global risk brokerage and human capital consulting firm, with scale across more than 120 countries and an extremely diversified client base — the largest client accounts for barely ~1% of revenue. Return on invested capital of 15.7% comfortably clears the 10% bar, a solid result for a company whose balance sheet carries the goodwill of decades of acquisitions, including NFP, without that being read as poor quality: the numerator grows while the denominator carries the price paid for past inorganic growth.
Guidance reaffirmed on July 29, 2026 —mid-single-digit or higher organic growth and 70-80 basis points of adjusted operating margin expansion— anchors the projection path, with the NFP integration substantially complete freeing up margin as its integration costs dilute away. Reported TTM growth (4.9%) is temporarily depressed by the sale of NFP's Wealth business in the fourth quarter of 2025; organic growth —the clean measure— runs at 5-6%.
The valuation
Valued on P/E over comparable net income, with a multiple of 26× in the middle of the insurance-broker archetype band [16-22×]. The 5-year value comes from projecting the guided revenue and margin path, applying the terminal multiple to year-5 comparable net income, with the observed share buyback pace modeled explicitly rather than accumulating cash.
The estimated total return over 5 years, combining appreciation and dividend, is +5% against the 10% bar.
The margin of safety
It trades close to intrinsic value, far from the required margin of safety. The normalized entry multiple —excluding the extraordinary gain from the sale of NFP Wealth— is already at the high end of the sector band, so much of the thesis's margin depends on the guided margin expansion materializing as expected.
What to watch
The central disconfirmer is structural: the migration from variable commission to fixed fee, which decouples revenue from the insurance pricing cycle, and pressure from insurers and capital markets seeking to place risk directly with the client, without an intermediary. Neither has compressed the operating margin so far, but they are the test that would invalidate the thesis if they accelerate.
Educational / informational. Does not constitute investment advice.