SYNTHOS RESEARCH

Aon AON

Financial Services · Insurance - Brokers · Synthos Deep Dive · 2026-08-04

$355.40
Hold
—
—

The Overview

Aon is one of the three big insurance brokers in the world. It does not insure anything itself; it arranges cover for large companies and takes a commission. It also advises on pensions, benefits and pay. It is a good business: clients rarely switch, and the fees rise as insurance gets more expensive.

The results published on 29 July were fine. Underlying sales grew 5%. Profit margin improved. Profit per share came in at $3.81 where analysts expected $3.80 — a beat of one cent.

Two things are less good. Total sales grew only 2%, because Aon sold part of a business it had bought. And the cash the business actually generated in the quarter fell 34%, to $483 million from $732 million. Management says that is a tax payment on the business it sold plus timing on working capital. The next results, on 30 October, will show whether that is right.

The shares have done nothing for a year: up 0.9%, against a stock market up 24%.

The reason is on the balance sheet. Aon spent heavily on acquisitions, and the accounting value of what it bought — goodwill and intangibles — is $21.5 billion, against shareholders' funds of $9.4 billion. Subtract one from the other and the company's tangible net worth is about minus $12 billion. It owes $15.2 billion. The market has marked it down for that, and it is right to.

The encouraging part is that management is fixing it: debt fell by $1.7 billion in the first six months of this year.

At $356.66 the shares cost about 16.7 times what analysts expect for 2027. Rivals usually cost more. Our estimate of fair value is $395, about 11% above the price. Analysts average $404.43 — though notably, nineteen of the thirty-eight covering the stock say Hold.

One note on our own knowledge base: it contains not one claim about Aon out of 52,021. We say so rather than reaching for something adjacent.

Putting a number on it: our fair-value estimate is $395 against a current price of $355.40 — real upside if our numbers are right.

Our summary metrics

Downside Risk (lower = safer)6/10High

"Rated 6 — an exceptionally stable revenue base on a balance sheet with no tangible asset behind it. The supports: revenue that is overwhelmingly recurring brokerage commission and fee income across Risk Capital and Human Capital segments, in more than a hundred countries; organic revenue growth of 5% in the June quarter; an adjusted operating margin near 28%; a beta of 0.705; and genuine deleveraging — filed long-term debt fell from $14,660 million at 2025-12-31 to $12,947 million at 2026-06-30, a $1,713 million reduction in six months. Against that: goodwill of $15,797 million plus other intangibles of $5,727 million total $21,524 million against total equity of $9,352 million, so TANGIBLE book value is approximately MINUS $12.2 billion; retained earnings are NEGATIVE at minus $245 million (improved from minus $2,309 million); filed total debt of $15,249 million is 1.63x total equity; and the current ratio is 1.11x on $25,774 million of current assets against $23,226 million of current liabilities, most of which is fiduciary. Free cash flow FELL 34% in the June quarter to $483 million, which management attributes to the NFP Wealth cash tax payment and working capital, and the half grew only 4%. The NFP acquisition and the subsequent NFP Wealth divestiture have left a business whose reported revenue growth (2%) is three points below its organic growth (5%), and whose accounts require three sets of adjustments to read."

Growth Quality6/10High

"Rated 6 — good organic growth obscured by portfolio activity, with a reported line that flatters nobody. Revenue: $15,698 million (2024), $17,181 million (2025, PLUS 9.4% on the NFP acquisition), and the June 2026 quarter at $4,246 million against $4,155 million, PLUS 2%, with the first half at $9,280 million against $8,884 million, PLUS 4%. The important figure is the one management leads with: ORGANIC revenue growth of 5% in the quarter. The three-point gap between organic and reported is the NFP Wealth divestiture, completed in the fourth quarter of 2025, and it will annualise out. Adjusted operating income rose 5% to $1,227 million in the quarter and 7% to $3,193 million in the half, with adjusted operating margin near 28% and expanding. Adjusted earnings per share of $3.81 beat consensus by 0.3% — the narrowest beat in this batch — on revenue 0.7% BELOW estimate, which is a margin-driven result rather than a demand-driven one. Consensus has adjusted EPS at $19.090 (2026), $21.340 (2027) and $23.790 (2028) — growth of 12.6%, 11.8% and 11.5% — on revenue of $17,942 million, $19,101 million and $20,248 million, i.e. 4.4%, 6.5% and 6.0%. That is a business converting mid-single-digit revenue growth into low-double-digit earnings growth through margin and share count, which is exactly what a good broker does. A 6 rather than an 8 because the reported top line has grown 2% in the most recent quarter and free cash flow fell 34% in it."

Exponential Potential3/10Low

"Rated 3 — a professional-services firm with genuine but bounded optionality. Aon brokers insurance and reinsurance and advises on human capital; it earns commission and fee income on risk transfer, which grows with insured values, with rate, and with the complexity of the risks its clients face. Two of those three have secular tailwinds — climate, cyber and supply-chain risk are all becoming more complex and more expensive to place — and a broker is structurally advantaged in a hardening market because commissions scale with premium without the underwriting exposure. The firm's stated strategy of building a 'Risk Capital' and 'Human Capital' structure with data and analytics across both is the closest thing here to a platform, and the NFP acquisition extended it into the middle market. What holds the score at 3: none of it compounds non-linearly. Revenue grows at mid single digits organically, margin expands by fifty to a hundred basis points a year, and the share count falls about 1% a year on a $1 billion annual repurchase. There is no network effect that a competitor cannot replicate, the two largest peers are equally capable, and the balance sheet — negative tangible equity of roughly $12.2 billion — limits the pace at which further platform acquisitions can be made until the debt comes down. A 3: a durable, high-quality, linear compounder."

Fair value$395 $270–$445
What does “fair value” mean?

Fair value is Synthos’s estimate of what one share is worth today, based on our model of the company’s future cash generation and the risks to it. It is not a price target or a prediction of where the stock trades next quarter — it’s the price where we think risk and reward are balanced. Above it, you’re paying for outcomes better than our base case; below it, the market is offering a margin of safety.

The model’s inputs and weightings are proprietary — they’re the product. What we publish is the output, plus an independent, public-math cross-check further down the page (“Check our number”) so you can judge it for yourself.

What do the 5 tiers mean? (Core · Tactical · Watch · Hold · Avoid)
Buy — CoreOwn it as a foundation — start or add now, size it for years, let dips be gifts.
Buy — TacticalGood price + confirmed trend + a defined exit — buy the setup, not a marriage.
WatchWe want the business, just not at this price/setup — act only when the listed trigger hits.
HoldFine to keep if you own it — no reason to buy more; new money does better elsewhere.
AvoidDon't own it — the problem is the business or the expectations, so a cheaper price won't fix it.

The Road Ahead

What we expect to matter in each window, and the evidence that would prove us wrong.

Short term 0-6 months

Neutral
Driver
"The most neutral technical setup in this batch, on a stock that has spent a year going sideways. Aon closed 2026-08-04 at $356.66, down 0.27% from $357.63, having traded $350.38 to $357.08 on 757 thousand shares. That is 6.5% below a 52-week high of $381.26 and 15.7% above a low of $308.27, 4.3% above a 50-day moving average of $341.98 and 6.0% above a 200-day average of $336.55. RSI is 50.9 — almost exactly neutral and the closest to fifty in this batch — and MACD is +5.82. The trailing-year maximum drawdown was MINUS 12.87%, which on this file genuinely differs from the current 6.45% distance to the high, so the field records a real maximum. Relative performance is the story: 3-month plus 13.3% against SPY plus 7.6%, 6-month plus 2.0% against plus 11.1%, and 12-month PLUS 0.91% against SPY PLUS 24.3% — a twenty-three point deficit, the second worst in this batch. The June quarter beat adjusted earnings by 0.3% — the narrowest beat here — and MISSED on revenue by 0.7%. Free cash flow in the quarter fell 34%. Nothing in the near term is likely to move this materially, and the analyst community agrees: 19 of 38 are at Hold."
What we’re watching
"The 2026-10-30 print against a consensus adjusted EPS of $3.41 and revenue of $4,093 million. Inside it: organic revenue growth, at 5% in the June quarter, which is the only clean measure of demand once the NFP Wealth divestiture is stripped out; adjusted operating margin, near 28% and expanding; and above all FREE CASH FLOW, which fell 34% to $483 million in the June quarter and grew only 4% to $846 million across the half — management attributes the shortfall to the NFP Wealth cash tax payment and working capital, and the third quarter is where that explanation is either confirmed or not. Management has also flagged a timing item affecting third-quarter adjusted earnings per share with a favourable offset thereafter, so the headline may be noisy. Also watch the debt: filed long-term debt fell $1,713 million in six months, and continued reduction is the single clearest positive signal available on this balance sheet."
Confidence
Medium

Medium term 6-24 months

Tailwind
Driver
"The medium-term case is a straightforward compounding argument that the price has stopped paying for. Consensus has adjusted EPS at $19.090 (2026), $21.340 (2027) and $23.790 (2028) — PLUS 12.6%, PLUS 11.8% and PLUS 11.5% — on revenue growth of 4.4%, 6.5% and 6.0%. The conversion of mid-single-digit revenue growth into low-double-digit earnings growth is the whole model, and the June quarter demonstrates it working: organic revenue up 5%, adjusted operating income up 5% and adjusted operating margin expanding to roughly 28%. At $356.66 that is 18.7x the 2026 consensus and 16.7x 2027, against insurance-broking peers that have generally commanded low-to-mid twenties. The discount has a reason and it is the balance sheet: goodwill and intangibles of $21,524 million against total equity of $9,352 million, negative retained earnings, and filed debt of $15,249 million at 1.63x equity. The encouraging part is that it is being addressed — long-term debt fell from $14,660 million to $12,947 million in six months, an $1,713 million reduction — and every dollar of that reduction moves the multiple's justification. Shareholder return is modest by comparison: $1,000 million of repurchases and $629 million of dividends in fiscal 2025, roughly 2.15% of market capitalisation."
What we’re watching
"Whether organic revenue growth holds at 5% or better; it is the only measure that is not distorted by acquisitions and divestitures. Whether adjusted operating margin keeps expanding toward 30%. Whether free cash flow recovers from the 34% quarterly decline — the half grew only 4% and the full-year figure is the number that supports the debt reduction. Whether long-term debt continues falling at anything like the $1,713 million half-year pace; at that rate leverage normalises within two years. Whether the NFP integration delivers the revenue and growth synergies the filings still describe as forward-looking risks. Whether the buyback accelerates from $1,000 million a year once deleveraging is complete. And whether reported revenue growth converges upward toward organic as the NFP Wealth divestiture annualises out of the comparison."
Confidence
Medium

Long term 2+ years

Tailwind
Driver
"Long run, insurance broking is one of the better business models in financial services and Aon is one of three firms that matter globally. Brokers earn commission and fee income on risk transfer without taking underwriting risk; revenue scales with insured values and with premium rates, both of which rise structurally as the world's assets become more valuable and its risks more complex; and client relationships are sticky because placing a large corporate programme requires institutional knowledge that takes years to rebuild. The secular drivers are the ones every risk professional now names: climate, cyber, supply chain and human capital, all of which are becoming harder to quantify and therefore more valuable to advise on. Aon's specific position — a Risk Capital and Human Capital structure with analytics across both, extended into the middle market by NFP — is credible. The long-run reservations are financial rather than competitive. Total equity of $9,352 million supports $21,524 million of goodwill and intangibles, which means the firm has bought a meaningful share of its own position and carries the impairment risk that goes with it; the 10-Q's own forward-looking-statement language names the failure to realise NFP's anticipated revenue and growth synergies as a specific risk. Until the balance sheet is repaired, this is a compounder with a constraint on its own capital allocation."
What we’re watching
"Whether the goodwill and intangibles of $21,524 million — 42% of total assets, against $9,352 million of equity — survive without impairment. Whether retained earnings, currently NEGATIVE at minus $245 million, return convincingly to positive. Whether the three-firm structure of global broking holds, or whether a fourth competitor or a technology entrant changes it. Whether organic growth of 5% is a cycle rate or a structural one; hardening insurance markets flatter broker revenue and they do not last. Whether the Human Capital segment, reshaped by the NFP Wealth divestiture, finds a stable identity. And chief-executive succession: Gregory Case has led Aon since 2005 and the archive contains no succession disclosure — twenty-one years is a long tenure and it is a first-order governance question."
Confidence
Medium

Exponential Potential

Exponential Potential3/10Low

"Rated 3 — a professional-services firm with genuine but bounded optionality. Aon brokers insurance and reinsurance and advises on human capital; it earns commission and fee income on risk transfer, which grows with insured values, with rate, and with the complexity of the risks its clients face. Two of those three have secular tailwinds — climate, cyber and supply-chain risk are all becoming more complex and more expensive to place — and a broker is structurally advantaged in a hardening market because commissions scale with premium without the underwriting exposure. The firm's stated strategy of building a 'Risk Capital' and 'Human Capital' structure with data and analytics across both is the closest thing here to a platform, and the NFP acquisition extended it into the middle market. What holds the score at 3: none of it compounds non-linearly. Revenue grows at mid single digits organically, margin expands by fifty to a hundred basis points a year, and the share count falls about 1% a year on a $1 billion annual repurchase. There is no network effect that a competitor cannot replicate, the two largest peers are equally capable, and the balance sheet — negative tangible equity of roughly $12.2 billion — limits the pace at which further platform acquisitions can be made until the debt comes down. A 3: a durable, high-quality, linear compounder."

What could take this further than the base case — and where the market may be underpricing it. Full forward-growth and acceleration math in Deeper analysis, §4 below.

Deeper analysis

Technicals, fundamentals, valuation, and the full expert-claim evidence panel — the detail behind the numbers above.

Check our number Market-implied growth ≈ 15%/yr This isn’t how we calculate fair value — it’s public math you can verify yourself. To justify today’s $355, earnings would have to compound roughly 15% a year for 10 years (9% discount rate). Analysts forecast ~9%/yr, so the market is pricing in MORE than what the Street expects.

Reference table

Street consensus$404.43 (+13.4%) · median $391 (+9.6%) · high $445 (+24.8%) · low $380 — 6.5% ABOVE spot · 18 buy / 19 HOLD / 1 sell across 38 analysts, consensus "Hold"
Valuation18.7x FY2026E adjusted · 16.7x FY2027E · 15.0x FY2028E (5 analysts) · 21.0x trailing · 8.1x book of $44.09 · tangible book is NEGATIVE by ~$12.2bn
The June quarter, filedTotal revenue $4,246M, +2% — but ORGANIC revenue +5%, the three-point gap being the NFP Wealth divestiture · adjusted operating income $1,227M, +5% · adjusted operating margin ~28% · adjusted EPS $3.81 against a $3.80 consensus · revenue 0.7% BELOW estimate
The line that should stop a readerFree cash flow $483M against $732M — DOWN 34%. The half was $846M against $816M, up only 4%. Management attributes it to the NFP Wealth cash tax payment and working capital
Balance sheetGoodwill $15,797M + intangibles $5,727M = $21,524M against total equity of $9,352M → tangible book ≈ MINUS $12.2bn · retained earnings NEGATIVE at −$245M (from −$2,309M) · filed debt $15,249M, 1.63x equity
The most encouraging line in the fileFiled long-term debt fell from $14,660M to $12,947M in six months — a $1,713M reduction
Capital returnRepurchases $1,000M and dividends $629M in fiscal 2025 — 2.15% total shareholder yield
ConvictionZERO. Not one claim in 52,021 names Aon. And the three-letter ticker produced no false positives either — silence rather than noise
Technicals−6.5% from the 52-week high of $381.26, +15.7% above the low of $308.27; +4.3% above the 50-DMA, +6.0% above the 200-DMA; RSI 50.9 — the most neutral in this batch; 12-month +0.91% vs SPY +24.3%

What the experts actually said

No independent expert claims in the Synthos knowledge base yet for AON — this dive is fundamentals- and technicals-driven, not panel-driven.

Price & moving averages 12 months · 50 & 200-day averages · 52-week range

302324345366387Aug '25Nov '25Jan '26Apr '26Jun '26Aug '2652w hi $381Price 35550-DMA 352200-DMA 33852w lo $308

Solid line = price · dashed line = 50-day average · dotted line = 200-day average · the two thin horizontal lines mark the 52-week high and low. Price above both averages is an uptrend.

Data summary: last close $355.40, 1% above the 50-day average ($352), 5% above the 200-day average ($338) — an uptrend. 7% below the 52-week high of $381, 15% above the 52-week low of $308.

Bollinger Bands 20-day average ± 2 standard deviations

296319343366389Aug '25Nov '25Jan '26Apr '26Jun '26Aug '26Price 35520-day avg 355

The shaded band widens when the stock gets more volatile. Riding the upper edge = strong momentum (sometimes stretched); the lower edge = weak / potentially oversold.

Data summary: price $355.40 is currently inside the band (band $346–$363).

RSI (14) momentum gauge · 0–100

705030Aug '25Nov '25Jan '26Apr '26Jun '26Aug '26RSI 51.0

Above 70 (overbought zone, shaded) = overbought, below 30 (oversold zone, shaded) = oversold. Currently 51.

MACD 12 / 26 / 9 · trend & momentum

0Aug '25Nov '25Jan '26Apr '26Jun '26Aug '26signal -0.1MACD -0.5

The MACD line crossing above the signal line (bars flip to the up color) = momentum turning up; crossing below (bars flip to the down color) = turning down. Bar height = the size of that gap.

Data summary: MACD is currently below its signal line by 0.38, negative momentum.

Relative performance vs S&P 500 & its sector (XLF (sector)), set to 100 a year ago

8192102112123Aug '25Nov '25Jan '26Apr '26Jun '26Aug '26S&P 500 119XLF (sector) 108AON 97

Solid = AON · dashed = S&P 500 · dotted = XLF (sector). A rising line means it is beating that benchmark — the sector line shows whether it is a leader or laggard within its own group.

Forward revenue & earnings actual → estimate · "FY" = fiscal year, "E" = estimate

06121823$12BFY22EPS $13$13BFY23EPS $14$16BFY24EPS $15$17BFY25EPS $17$18BFY26EEPS $19$19BFY27EEPS $21$20BFY28EEPS $24$21BFY29EEPS $25

Darker bars = actual results, brighter = analyst estimates. Taller bars to the right = expected growth.

Key stats an RIA wants

Price$355.40
Market cap$75B
P/E trailing19×
P/E FY26E / FY27E19× / 17×
EV / Sales5.1×*
EV / EBITDA14.1×*
Gross margin83.1%
Net margin22.3%
Dividend yield0.88%
Beta0.676
52-wk range$308 – $381
RSI(14)49
50 / 200-DMA$352 / $338
12-mo return+-4% (SPY +19%)
Street target$409 ($382–$445)
Analyst grades18 Buy · 19 Hold · 1 Sell
FMP ratingB+
Next earnings2026-10-30 (Q3 2026 earnings, 87 days away; vendor consensus adjusted EPS $3.41 against $3.05 a year ago on revenue of $4,092,649,000 against $3,997,000,000, implying 2.4% reported revenue growth. Management has also flagged a timing item affecting adjusted earnings per share in the third quarter of 2026.)

* Enterprise value recomputed in-house: the data vendor nets cash but omits short-term investments, overstating EV for cash-rich balance sheets. EV multiples marked * use market cap + total debt − cash − short-term investments.

1. The June quarter — read the organic line, not the reported one

From the 8-K earnings release filed 2026-07-29 ($M except per share):

Q2 2026Q2 2025changeH1 2026H1 2025change
Total revenue$4,246$4,155+2%$9,280$8,884+4%
Organic revenue growth——+5%———
Adjusted operating income$1,227$1,171+5%$3,193$2,987+7%
Adjusted operating margin~28%—expanding———
Adjusted EPS$3.81$3.49+9.2%———
versus consensus$3.80—+0.3%———
Revenue versus consensus$4,275M est.—−0.7% MISS———
Free cash flow$483$732−34%$846$816+4%

Three readings.

The reported top line understates the business by three points and the gap is disclosed. Total revenue grew 2% while organic revenue grew 5%; the difference is the NFP Wealth divestiture, completed in the fourth quarter of 2025, which the 10-Q identifies as "NFP's Wealth businesses within our Human Capital segment." That drag annualises out of the comparison by the fourth quarter of 2026, at which point reported and organic growth converge.

The margin is doing the work and it is doing it well. Adjusted operating income rose 5% on revenue up 2%, and 7% on revenue up 4% across the half, with the adjusted operating margin near 28% and expanding. Management's own framing — "adjusted operating margin expansion, strong adjusted EPS growth and double-digit free cash flow growth" — is half-weighted per house rule, and the third of those three claims is not what the quarter shows.

Free cash flow fell 34% in the quarter and that is the number to hold on to. $483 million against $732 million, with the half up only 4% to $846 million against $816 million. Management attributes the shortfall to "the cash tax payment related to NFP Wealth and impact of working capital" offsetting adjusted operating income growth. That is a plausible and specific explanation for a one-off; it is also the single largest negative datum in this file, and on a company whose investment case rests on cash generation funding deleveraging, it matters more than the one-cent earnings beat.

And the beat itself is the narrowest in this batch. $3.81 against $3.80 — 0.3% — on revenue 0.7% BELOW estimate. Against the prior four prints (+4.8%, +1.7%, +2.1%, +2.6%), Aon's beats are consistently small, which is what a well-modelled recurring-revenue business produces and is a point in its favour rather than against.

2. The balance sheet — the reason for the discount, and the reason to keep watching

From bal_a at 2025-12-31 and the 10-Q at 2026-06-30 ($M):

2025-12-312024-12-31
Cash and equivalents1,1951,085
Short-term investments1,60310,538
Total current assets25,77423,432
Goodwill15,79715,234
Other intangible assets5,7276,743
Total assets50,78448,965
Total current liabilities23,22622,995
Short-term debt589751
Long-term debt (FILED, from the 10-Q)14,660—
= Total debt, FILED15,249—
Total stockholders' equity9,3526,121
Retained earnings−245−2,309
Noncontrolling interest196309

And the 10-Q at 2026-06-30 shows long-term debt of $12,947 million against $14,660 million at the year end — a $1,713 million reduction in six months.

The central fact: goodwill of $15,797 million plus other intangibles of $5,727 million total $21,524 million — 42.4% of total assets — against total equity of $9,352 million. Tangible book value is therefore approximately MINUS $12,172 million. Retained earnings are NEGATIVE at minus $245 million, though improved from minus $2,309 million a year earlier as earnings accumulate.

Filed total debt of $15,249 million is 1.63x total equity, and the 10-Q's forward-looking-statement language names the failure to realise "NFP (including anticipated revenue and growth synergies) in the expected timeframe, or at all" as a specific risk. That is the company telling readers where the goodwill risk sits.

Capital return is modest. Fiscal-2025 repurchases were $1,000 million — the identical figure to fiscal 2024, which suggests a fixed annual allocation rather than an opportunistic one — and dividends $629 million. Combined $1,629 million, a 2.15% total shareholder yield, the second-lowest in this batch. Given $15.2 billion of debt and negative tangible equity, prioritising deleveraging over buyback is the right allocation, and the $1,713 million half-year debt reduction says that is what is happening.

One further balance-sheet item worth naming: short-term investments fell from $10,538 million to $1,603 million between the two year-ends — an $8,935 million reduction. Aon holds substantial fiduciary assets on behalf of clients, and movements of that size are more likely a classification change than an economic event; the extracted text does not explain it and this dive does not build on it.

3. Free cash flow

($M)FY2024FY2025H1 2026
Operating cash flow3,0353,481—
Capital expenditure(218)(263)—
= Free cash flow (annual, vendor)2,8173,218—
Free cash flow (management measure, filed)——846 (vs 816, +4%)
of which Q2——483 (vs 732, −34%)
Yield on $75.66bn—4.25%—

capitalExpenditure is identical to investmentsInPropertyPlantAndEquipment in both years and is very low — 1.5% of fiscal-2025 revenue — which is what an asset-light professional-services firm should look like. No filed capital-expenditure line was located in the extracted text, so the annual figures are recorded as internally consistent rather than filing-verified; management's own free-cash-flow measure for the half IS filed and is used above.

The divergence between the annual trend and the quarterly print is the thing to watch. Fiscal-2025 free cash flow of $3,218 million is a 4.25% yield and grew 14.2% on fiscal 2024. The June 2026 quarter fell 34%. If the NFP Wealth cash tax explanation holds, the full year recovers; if it does not, the deleveraging that justifies the multiple slows.

4. Valuation — priced in or room?

At $356.66 (market capitalisation $75.66B; 214.6 million weighted-average diluted shares in the June quarter):

TrailingFY2026EFY2027EFY2028E
Consensus adjusted EPS$16.99 (four filed quarters)$19.090 (14)$21.340 (14)$23.790 (5)
EPS growth—+12.6% (on FY2025's $16.96)+11.8%+11.5%
P/E21.0x18.7x16.7x15.0x
Consensus EPS range—$18.830–$19.500 (3.6%)$20.727–$22.355 (7.9%)$22.229–$24.723
Consensus revenue ($M)—17,942 (13)19,101 (13)20,248 (12)
Revenue growth—+4.4%+6.5%+6.0%
Price / book ($44.09)8.09x———
Tangible bookNEGATIVE (~−$57/share)———
Free cash flow yield (FY2025)4.25%———
Total shareholder yield2.15%———

Estimate coverage is excellent on the anchor years and the dispersion is very tight: 14 analysts on both FY2026 and FY2027, with the FY2027 range spanning only 7.9% ($20.73 to $22.36) — the third-narrowest in this batch. FY2028 rests on 5 analysts and is used only as a cross-check. A 7.9% spread on a recurring-fee business is what predictability looks like, and it makes the anchor here more reliable than on most names in this batch.

est.ebitdaAvg and est.ebitAvg are rejected. In every year from 2023 to 2029 — seven of the eight rows — ebitdaAvg is exactly 28.7212% of revenueAvg and ebitAvg exactly 25.3821%; the 2022 row carries a different fixed pair (20.8586% / 17.1287%), confirming the block is a template applied in tranches. The implied 25.38% EBIT margin sits below the company's own adjusted operating margin of roughly 28% and above its GAAP operating margin, so it corresponds to neither published basis. All forward valuation uses epsAvg only.

Enterprise value is rebuilt. Market capitalisation $75,656.7M plus filed debt of $15,249M less cash of $1,195M plus non-controlling interests of $196M = $89,906.7M, or 5.01x consensus 2026 revenue. The payload's netDebt of $15,336M is rejected (Section 5).

4a. What today's price assumes (the inversion)

At $356.66 — 18.7x the 2026 consensus and 16.7x 2027 — the price embeds roughly:

4b. The return bridge (why the multiple moves)

Expected return over the next twelve months decomposes as adjusted EPS growth (+11.8%, from FY2026E $19.090 to FY2027E $21.340) + multiple drift + shareholder yield (+2.15%).

Our base assumes the multiple EXPANDS, from today's 16.7x on the 2027 year to 18.5x — an 11% re-rating — and the mechanism is the balance sheet rather than the business. Aon trades at a discount to insurance-broking peers because it carries $15.2 billion of debt and negative tangible equity; every dollar of the $1,713 million half-year debt reduction narrows the gap between what this business earns and what the market pays for it. That is a specific, observable, dated mechanism rather than a hope.

At an unchanged 16.7x, fair value on the 2027 consensus is $356.38 — spot to twenty-eight cents — and the twelve-month return is 11.8% of earnings growth plus 2.15% of yield, roughly 14%. That floor is respectable, and it is why the verdict is Hold rather than anything weaker.

Sensitivity: on the FY2027E consensus mean of $21.340, 13.0x = $277, 15.0x = $320, 16.7x = $357 (spot), 18.5x = $395, 21.0x = $448.

4c. Variant perception (where we differ, what would surprise)

Synthos fair values

All three anchors are multiples of the FY2027 consensus adjusted EPS distribution — mean $21.34001, low $20.72714, high $22.35477, 14 analysts, a 7.9% spread — cross-checked against the FY2026 row.

Base is 10.7% above spot; asymmetry roughly 1.02:1 (24.3% down, 24.8% up), before a 2.15% shareholder yield. A payoff ratio of almost exactly one-to-one on a high-quality business at a fair price is the definition of Hold, and no amount of admiration for the franchise changes it.

5. Data integrity — what we rejected and why

Five findings. Aon's June-quarter income-statement row is the most obviously impossible in this batch, and its leverage figure carries the confirmed double-count.

1. The June-2026 inc_q row is arithmetically impossible in three fields — REJECTED.

inc_q fieldQ1 2026Q2 2026verdict
revenue$5,034M$4,246Mcorrect — matches the filed $4,246M
grossProfit$4,413M$4,867MIMPOSSIBLE — $621M LARGER than revenue
operatingIncome$1,807M$823Mnot reconcilable to the filed adjusted $1,227M
interestExpense+$179M−$537,000,000NEGATIVE — a sign-flipped or mis-mapped field
depreciationAndAmortization+$198M−$198,000,000NEGATIVE, and EXACTLY the negation of the prior quarter's value

Three impossibilities in one row: a gross profit exceeding revenue, a negative interest expense, and a depreciation figure that is precisely the sign-flip of the immediately preceding quarter's. This is the partial-row corruption class in its clearest form — the revenue field in the same row is exactly right — and it is the reason this programme checks fields individually rather than trusting or condemning whole rows. Every June-quarter figure in this dive comes from the 8-K earnings release instead.

2. totalDebt double-counts the lease liability — REJECTED and rebuilt, with an exact reconciliation. The payload reports fiscal-2025 shortTermDebt $589M, longTermDebt $15,301M and capitalLeaseObligations $641M, summing to totalDebt of $16,531M. The 10-Q's balance sheet shows long-term debt of $14,660M at 2025-12-31. $15,301M − $14,660M = $641M — the lease liability, folded into long-term debt — and then the same $641M is added AGAIN as capitalLeaseObligations. Filed total debt is $589M + $14,660M = $15,249M; the payload overstates it by $1,282M, exactly 2 × $641M. This is the HCA double-count signature, reproduced to the dollar for the third time in this batch. Consequential rejections: netDebt $15,336M (correct: $14,054M), debtToEquityRatioTTM, debtToAssetsRatioTTM and enterpriseValueTTM (rebuilt: $89,906.7M including the $196M non-controlling interest).

3. est.ebitdaAvg and est.ebitAvg carry the fixed-ratio fabrication signature — REJECTED. In seven of the eight rows — every year from 2023 to 2029 — ebitdaAvg is exactly 28.7212% of revenueAvg and ebitAvg exactly 25.3821%; the 2022 row carries a different fixed pair (20.8586% / 17.1287%), which confirms the block is a template applied in tranches rather than a collection of estimates. All forward valuation uses epsAvg only.

4. acquisitionsNet for fiscal 2025 reads POSITIVE $1,955 million — correct, and easy to misread. In a year in which Aon completed the NFP Wealth divestiture, the acquisitions line shows a cash INFLOW. That is disposal proceeds, not acquisition spend, and it is correctly signed — but a reader treating it as acquisition activity would conclude Aon was a net buyer of $2 billion of businesses in 2025 when the opposite occurred. Recorded because the same field was misleading in the opposite direction on a bank earlier in this programme.

5. shortTermInvestments falls from $10,538 million to $1,603 million between fiscal 2024 and fiscal 2025 — flagged, unexplained. An $8,935 million reduction in one line. Aon holds substantial fiduciary assets on behalf of clients and a movement of this size is more plausibly a classification change than an economic event, but the extracted text does not explain it and this dive builds nothing on it. Note that the payload's netDebt calculation ignores short-term investments entirely, so the change does not propagate — but a reader computing net cash from cashAndShortTermInvestments across the two years would see a $9 billion swing that may not have occurred.

Verified clean — recorded:

Peer set — REJECTED as mostly irrelevant. The vendor peers are Arthur J. Gallagher, Apollo Global Management, Bank of New York Mellon, Bank of Nova Scotia, Canadian Imperial Bank of Commerce, ING Groep, Mizuho Financial, Marsh & McLennan, Nu Holdings and PNC Financial. Only TWO of the ten — Arthur J. Gallagher and Marsh & McLennan — are insurance brokers. SIX are banks, one is an alternative-asset manager and one is a Latin American digital bank. Willis Towers Watson, the third global broker, is absent. No peer-multiple comparison is drawn.

Vendor composite rating — noted. rating gives B+ / 3 overall with 1 on debt-to-equity and 1 on price-to-book. The debt-to-equity sub-score is computed on the $16,531M figure rejected in finding 2; on the filed $15,249M the ratio is 1.63x rather than 1.77x, which is better but still poor. The price-to-book score of 1 reflects a genuine fact — 8.1x book on a balance sheet with negative tangible equity — and points the same way this dive does.

Non-equity tripwire — checked and passed. AON is common stock, NYSE-listed. Note that the company is domiciled in Ireland (country: IE) and files as a US domestic registrant. Beta 0.705; volume 757 thousand shares (~$270M of turnover); the 52-week band of $308.27 to $381.26 is a 24% range — the narrowest in this batch. This is common equity.

6. Knowledge base — an empty lane, and a clean one

Raw hits: ZERO. Exact case-sensitive entity matches: 0. Case-insensitive entity matches: 0. Text-only: 0.

The sweep ran entity terms AON, Aon plc, Aon, NFP, Willis Towers Watson and Marsh McLennan, plus free text on "aon plc", "insurance broker" and "reinsurance broker", across all 52,021 distilled claims. It returned nothing at all.

Two things are worth recording about that.

First, it is a genuine void and it is reported as one. Not one claim in the Synthos knowledge base names Aon, its acquisition NFP, or either of its two global competitors. The verdict above rests entirely on filings, the vendor payload and arithmetic, and no adjacent macro material has been promoted into a conviction reading it cannot support. This is the fifteenth name-level void found and published in this programme rather than padded.

Second — and this is the more interesting half — the sweep produced no FALSE positives either. AON is a three-letter ticker and was flagged before this batch began as collision-prone. It collides in ordinary usage with "aeon", with the Japanese retailer AEON, and with several abbreviations. The case-sensitive entity run returned nothing, and the free-text terms returned nothing. Compare the outcomes elsewhere in this batch: a search on a spun-off subsidiary's name returned an Australian copper explorer; a search on a car brand returned a Quebec gold-bearing fault; a search on "railroad" returned twenty-three claims using it as a metaphor for artificial-intelligence capital expenditure. On Aon the store was silent rather than confidently wrong, which is the better of the two failure modes and is worth logging as a clean result rather than merely an absent one.

Conclusion. Breadth 0, claim count 0, net conviction none.

7. Technicals

8. Verdict, kill-criteria and flip conditions

Hold.

What is good. Aon is one of three global insurance brokers, earning commission and fee income on risk transfer without underwriting exposure, from client relationships that are institutionally sticky. Organic revenue grew 5% in the June quarter; adjusted operating income grew 5% on reported revenue up only 2%; the adjusted operating margin is near 28% and expanding; and adjusted earnings per share of $3.81 beat consensus. Consensus has earnings growing 12.6%, 11.8% and 11.5% on revenue growth of 4-6%, with a 7.9% estimate range on 2027 — one of the tightest in this batch. And the balance sheet is being repaired: long-term debt fell $1,713 million in six months. The stock has returned 0.91% over twelve months against an index up 24.3%, at an RSI of 50.9, so the entry is neither a chase nor a falling knife.

Why the verdict is Hold.

First, the arithmetic is almost exactly balanced. Base $395, +10.7%; bear $270, −24.3%; bull $445, +24.8%. Asymmetry 1.02:1. Adding a 2.15% shareholder yield does not change the character of a one-to-one bet.

Second, the balance sheet is the reason for the discount and it is not yet fixed. Goodwill of $15,797 million plus intangibles of $5,727 million — $21,524 million, 42.4% of total assets — against total equity of $9,352 million, leaving tangible book value at approximately MINUS $12.2 billion. Retained earnings are negative. Filed debt is 1.63x equity. The 10-Q names failure to realise NFP's "anticipated revenue and growth synergies... in the expected timeframe, or at all" as a specific risk.

Third, free cash flow fell 34% in the quarter, and free cash flow is what pays down the debt that would justify the re-rating. $483 million against $732 million, with the half up only 4%. Management's explanation — the NFP Wealth cash tax payment and working capital — is specific and plausible, and it is unverified until 2026-10-30.

Why it is not an Avoid. At an unchanged multiple the twelve-month return is roughly 14% — 11.8% of earnings growth plus 2.15% of yield — which is a respectable floor for a business of this quality. The de-rating has a legible cause and a legible remedy, and the remedy is visibly under way at $1,713 million a half. And the knowledge base's silence here is genuine silence rather than a negative view.

Pre-registered UPGRADE conditions — what would take this to Watch or Buy — Tactical:

Pre-registered KILL criteria — what would take this to Avoid:

Where AON fits in the Synthos Framework Portfolio. Not entered today. Held on the watch list with a trigger price of ~$320 and an event trigger of free-cash-flow recovery on 2026-10-30. Sizing note: this is a high-quality compounder at a fair rather than a cheap price, whose discount to peers has one cause and one remedy, both measurable — and the correct response to a 1.02:1 payoff ratio is to wait for either the price or the evidence. Logged as a tracked Synthos call (Hold) as of 2026-08-04 at $356.66, with the fair-value anchors, kill criteria and upgrade conditions all gradeable.

Single biggest risk: $21,524 million of goodwill and intangibles against $9,352 million of equity. There is no tangible asset behind this equity — tangible book value is approximately MINUS $12.2 billion — and the company's own filings name the failure to realise NFP's anticipated revenue and growth synergies as a specific risk. An impairment of 43% of the intangible base would eliminate the equity entirely. Nothing in the current disclosure suggests that is imminent: organic growth is 5%, the margin is expanding, and debt is falling at $1,713 million a half. But it is why a business earning 11-13% compound EPS growth with a 7.9% estimate dispersion trades at 16.7x forward when its two listed peers do not, and it is why the free-cash-flow line — down 34% in the quarter just reported — matters more here than the one-cent earnings beat that accompanied it.

Provenance & disclosures