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Quote this valuation with its source: Fair value, Potential value and the price at analysis.
FAQ
AON — frequently asked questions
Is Aon plc overvalued?
In our latest published analysis dated 2026-10-02, AON looks meaningfully undervalued. The price recorded at analysis is USD 276 versus our fair value of USD 338; the high endpoint is presented separately as potential value of USD 420. That implies roughly 22.6% upside to fair value at that date.
Our latest published report, analyzed 2026-10-02, gives AON a fair value of USD 338 and a potential value of USD 420. The conclusion is triangulated across multiple valuation models and weighted by reliability for Aon plc's archetype; it is a dated research output, not a live price.
Should I buy AON now?
Our latest published rating for AON, analyzed 2026-10-02, is Buy. Aon plc looks meaningfully undervalued at the analysis-date price of USD 276 versus fair value of USD 338; potential value is USD 420. This is research for educational purposes, not personalized investment advice.
What are the biggest risks for AON?
The dedicated bear-case section in our report analyzed 2026-10-02 documents Aon plc's material risks, evidence, thresholds, and thesis-invalidation conditions. Scenario-specific explanations remain in that section so the report does not repeat or decontextualize them elsewhere.
What is AON's rating?
Our latest published rating for AON, analyzed 2026-10-02, is Buy, with a published moat assessment of 8/10 (Narrow). It reflects our fair value of USD 338, the potential value of USD 420, and the price recorded at analysis (USD 276).
Aon's biggest opportunity lies in accelerating corporate advisory for complex global megatrends, notably its rapidly expanding data center and alternative capital advisory pipeline which is up over three times year-over-year.
Main risk
Aggressive producer talent recruitment by expanding peers like AJG (compounding at 13% forward growth) forces defensive retention packages and salary inflation.
We rate Aon plc as Buy with a Fair value of USD 338.37, representing a 22.62% upside from the USD 275.95 price on October 1, 2026.4
A Buy rating reflects our view that Aon shares offer attractive risk-adjusted upside for long-term investors based on its steady cash flow generation and durable competitive position.
The report was prepared at a price of USD 275.95 on October 1, 2026. This price sits 18.45% below our Fair value of USD 338.37, which offers 22.62% upside. If the company accelerates commercial risk advisory growth and margin gains, Potential value reaches USD 419.70.4
The primary risk that would challenge this view is intense broker recruitment competition and compensation inflation. If producer talent poaching forces aggressive wage increases, consolidated operating margins would drop below 22.5% from FY2025's 25.28%, depressing annual operating cash flow and weakening earnings expansion.5,7
The core reason this investment can work is Aon's dominant position in global commercial risk brokerage and reinsurance placement, which generated USD 11,290 million in FY2025 revenue and USD 3,436 million in segment operating income. By providing essential corporate risk analytics and placement services with high client retention, Aon converts revenue into USD 3,218 million in annual free cash flow, funding steady share buybacks and driving value per share higher.5,6,8
Dominant Risk Capital and Reinsurance Placement Franchise
Aon holds a leading position in commercial risk broking and reinsurance placement, generating USD 11,290 million in FY2025 revenue. Deep client integration and high switching costs sustain steady organic growth across market cycles.8
Aon achieved an operating margin of 25.28% in FY2025, outperforming closest peer AJG at 19.16%. Centralized analytics via Aon Business Services drive management's 70 to 80 basis points annual margin expansion target.3,5,7
We rate Aon plc as Buy because its dominant global risk brokerage franchise and 25.28% operating margin generate over USD 3.2 billion in annual free cash flow, offering 22.62% upside to our USD 338.37 Fair value.6,7
Company overview
Reinsurance Solutions includes treaty reinsurance, facultative reinsurance, Strategy and Technology Group and capital markets. Treaty reinsurance addresses underwriting and capital objectives on a portfolio level, allowing its clients to more effectively manage the combination of premium growth, return on capital, and rating agency interests on an integrated basis.
This includes the development of more competitive, innovative, and efficient risk transfer options.
Our stress testing simulates compounding operational headwinds where commercial property and casualty pricing decelerates sharply across primary casualty, D&O, and cyber lines, reducing Risk Capital organic revenue growth from the 6% rate achieved in 1H2026 to below 2.0%. In this environment, aggressive recruitment competition and producer raiding by competitors such as AJG (which is compounding at 13% forward growth) forces defensive compensation increases and producer retention bonuses. Operating expenses expand faster than revenues, compressing consolidated operating margin from FY2025's 25.28% to below the 22.5% threshold. Concurrently, refinancing obligations across Aon's $15.87B total debt burden in an elevated interest rate climate (pre-tax cost of debt 5.91% and risk-free rate 5.26%) inflate annual interest expenses, diminishing GAAP net income conversion and forcing management to curtail share repurchases below the $1.1B pace deployed in 1H2026. Under this synchronized stress, terminal de-rate from current of 13.48x toward 11.0x, compressing equity value toward the downside scenario valuation target of 259.81 USD.
Aon's competitive moat is anchored in structural switching costs and high client retention across large multinational enterprise risk programs. As corporate insurance programs expand across global jurisdictions, unbundling coverage, re-underwriting policies, and shifting broker management systems creates substantial organizational friction and operational exposure for corporate risk managers. This institutional entrenchment is reflected in Aon's dominant Risk Capital franchise, which generated $11,290M in FY2025 revenue across commercial risk placement and reinsurance advisory.
The firm reinforces this relationship stickiness through proprietary analytical platforms and shared operational infrastructure under Aon Business Services. Over fifteen years of centralized platform integration has established an extensive proprietary risk data lake that provides clients with bespoke risk quantification, cat modeling, and loss benchmarking. This technological scale enables Aon to deliver advisory depth across complex domains such as data centers and AI infrastructure, generating operating margins of 25.28% that substantially outperform closest broker peer AJG's 19.16%.
Aon's global distribution architecture and strategic positioning in the United Kingdom wholesale reinsurance market represent an additional structural barrier to entry. Generating $2,220M in FY2025 revenue from the UK, Aon acts as a vital conduit into Lloyd's of London and international syndicates. This bilateral placement scale creates network effects: underwriters require Aon's premium flow to access corporate risk portfolios, while corporate insureds rely on Aon's syndication reach to place multi-layered exposures that smaller or regional intermediaries cannot support.
The highlighted cell is Fair value when every assumption sits at its base level ($338.37). Each row and column shows what Fair value becomes when one assumption moves.
Free cash flow to the firm stays positive in the first projected year at $3.4B after modeled reinvestment of $292.4M, with terminal value at 81.6% of enterprise value. A sudden drop in free cash flow is not projected unless capital spending relative to , reinvestment, or resets materially.
Upgrade the rating; Consider increasing position allocation toward maximum concentration limits, verifying that operating cash flow conversion remains robust and that share repurchases continue to absorb employee equity dilution.
Trigger: Consolidated organic revenue growth accelerating above the guided range alongside operating margin expansion exceeding management annual targets, driven by strong Commercial Risk and Reinsurance placement volume.
An upside acceleration where organic revenue growth surpasses expectations and operating margin expansion exceeds full-year guidance confirms that Aon Business Services and specialty risk solutions are compounding faster than peers, justifying valuation toward $419.70.
The insurance intermediation industry displays an inherently asset-light capital profile, evidenced by an industry capex-to-revenue ratio of 0.55% and an industry capex-to-depreciation ratio of 0.24. Aon reflects this dynamic directly with FY2025 CapEx of $263M against $17,181M in revenue (capex/revenue of 1.53%), generating $3,218M in free cash flow.6,7
Bull cycle
The upside cycle is propelled by 'hard' commercial insurance market conditions, escalating corporate risk complexity, and expanding insurable asset classes. Rising premium rates in property and specialty casualty automatically expand ad-valorem brokerage commissions without requiring incremental capital deployment. Concurrently, complex macro challenges—including geopolitical volatility, climate events, workforce transformations, and artificial intelligence/data center expansions where project pipelines have expanded more than three-fold —drive elevated enterprise demand for sophisticated risk modeling and human capital advisory, accelerating organic beyond 6%.
§11 Position management
Sizing
3-5%
A moderate position sizing reflects Aon's defensive corporate broking franchise, high recurring revenue retention, and robust cash generation, balanced against financial leverage on $15.87B of total debt and competitive broker recruiting pressures.4,5
Risk
Risk management is anchored around monitoring operating margin durability and cash flow conversion. Aon's debt load of $15.87B requires consistent free cash flow generation ($3,218M in FY2025) to maintain credit health and debt service capacity. Any evidence of talent defection to aggressive peers like AJG or softening P&C pricing cycles that compresses margins below 24.50% serves as an immediate trigger to re-underwrite position size.
§12 Investor perspectives
Core Long-Term Quality
Buy
Aon is an essential global intermediary with high client retention, generating $3,218M in FY2025 free cash flow and a 25.28% operating margin. Trading at 13.48x forward P/E, it provides compounding defensive returns.4,6,7
Value and Total Return
Buy
Shares trade at an 18.45% discount to our USD 338.37 Fair value and a multiple discount to closest peer AJG (13.48x forward P/E vs AJG at 15.60x). Share buybacks ($1.1B in 1H 2026) enhance per-share capital compounding.
§14 Final recommendation
Action
Buy
We recommend purchasing shares of Aon plc based on a compositeFair value of USD 338.37, which offers 22.62% upside against the USD 275.95 price on October 1, 2026. Aon's dominant Risk Capital franchise ($11,290M FY2025 revenue) and peer-leading 25.28% operating margin generate over $3.2B in annual free cash flow.4,6,7,8
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Sources
The records this analysis drew on, as they stood when it was run.
Aon generated USD 3,218 million in FY2025 free cash flow, converting over 87% of net income. This supports steady capital returns, including USD 1.1 billion in share repurchases in the first half of 2026.5,6
Refinancing of debt maturities occurs at elevated prevailing interest rates.
In the downside scenario, broad softening in commercial property and casualty premium rates dampens ad-valorem brokerage commissions, while aggressive producer talent competition from peer intermediaries elevates compensation overhead. Concurrently, debt refinancing requirements across existing obligations elevate annual interest expense, reducing net earnings conversion. Investors would observe this deceleration through slowing quarterly organic growth across commercial risk lines and compression in operating margins by mid-FY2026, which would indicate that competitive pricing headwinds are overriding internal scale advantages.
Ways this thesis can break
Broker Talent Poaching and Severe Compensation Inflation
Management highlighted in Q2 2026 earnings remarks that industry-wide recruiting efforts are intense and competition is fierce. With closest peer AJG expanding aggressively at 13% forward growth, defensive broker compensation and producer guarantees would compress operating margin from FY2025's 25.28% to below 22.5%, breaching the 24.5% thesis durability threshold.1,5,7
First-half 2026 organic revenue growth slowed to 3%, with Commercial Risk moderating to 5% as casualty and D&O pricing decelerated. A broad soft cycle across commercial property and casualty lines would depress brokerage placement commissions across Risk Capital ($11,290M revenue), pulling medium-term organic growth below 2.0% toward the FY2027 consensus low of $20.15B.1,5,8
FV impact
-4.2%
Revenue and EPS growth 5 points lower for five years
Aon holds $15.87B in total debt requiring refinancing in an elevated interest rate environment (5.26% risk-free rate). Operational friction and producer turnover following the NFP acquisition, coupled with soft organic growth, would trigger a multiple de-rating from current forward P/E of 13.48x toward the peer lower bound of 11.0x (peer TRV trades at 11.9x forward P/E).2,3,4
FV impact
-6.4%
Terminal multiple 20% lower
Trigger
Within 24 months
Early-warning signals to monitor
The five developments that would weaken our investment case.
Aon generates substantial economic profit, with latest ROIC of 15.55% significantly exceeding its computed WACC of 7.3532% and computed cost of equity (moderate Ke) of 8.0669%. This economic profit spread is sustained by an asset-light corporate brokerage model requiring minimal CapEx ($263M in FY2025) against $3,218M in free cash flow.2,6,7
8/ 10
Narrow
Sources of advantage
01High Client Switching Costs in Commercial Risk & Reinsurance — Managing complex multi-jurisdictional risk coverage creates significant procedural and operational hurdles for corporate clients seeking to transfer broking relationships, supporting sticky recurring commission streams across Risk Capital ($11,290M FY2025 revenue).Wide
02Scale Advantage and Proprietary Data Lake via Aon Business Services — Centralized analytical platforms and proprietary claims data lakes enable automated placement, superior risk benchmarking, and operating margins of 25.28% that exceed peer AJG's 19.16%.Wide
03Global Distribution Network and Wholesale Placement Scale in London Market — Aon controls pivotal wholesale syndication channels into Lloyd's of London, with UK operations contributing $2,220M in FY2025 revenue, reinforcing bilateral market access that regional brokers cannot replicate.Moderate
Aggressive Broker Talent Poaching and Producer Compensation Inflation
medium
12 to 24 months
Long-term equity incentives, non-solicitation covenants, and integration with Aon Business Services analytical infrastructure diminish producer portability.5
P&C Commercial Pricing Softening and Ad-Valorem Commission Compression
medium
18 to 36 months
Diversification into fee-based consulting in Human Capital ($5,907M FY2025 revenue) and structured risk advisory for alternative capital mitigates direct underwriting cycle swings.5,8
Disintermediation and Direct Carrier-to-Client Digital Placement
low
3 to 5 years
Large-scale corporate exposures require bespoke underwriting, complex regulatory structuring across jurisdictions, and reinsurance syndication where digital direct models lack institutional capacity.5
Convert the revenue and margin path into after-tax free cash flow, discount the annual per-share amounts and at , then adjust for signed per current share.
In the base case, Aon maintains its disciplined operational execution across core commercial broking and reinsurance placement, achieving mid-single-digit organic revenue expansion consistent with nominal global economic growth. Operating margin expansion aligns with management annual targets as enterprise service efficiencies offset specialized talent compensation expenses. Share repurchases steadily reduce diluted share count, supporting intrinsic convergence toward $338.37 (labelled Fair value at $338.37) with an assigned probability of 60.0% and an implied upside of 22.6% relative to the price of $275.95. This outcome would be disconfirmed by multi-quarter deceleration in organic brokerage revenue or operating margin contraction below targeted levels by the end of FY2026.
In the bull case, expanding complex global risk exposures and strong commercial property and casualty pricing drive organic revenue expansion across Risk Capital and Human Capital. Enhanced operational efficiencies from enterprise analytics platforms expand operating profitability, accelerating free cash flow conversion and funding expanded share repurchases. Under these conditions, the shares project toward $419.70 with an estimated probability of 15.0%, offering an implied return of 52.1% from the analysis price of $275.95. This path requires sustained client demand across emerging risk categories such as data infrastructure, and would be disconfirmed if corporate insurance rate softening emerges before the conclusion of FY2027.
Performance tracking in line with baseline expectations validates the thesis of steady fee generation and margin durability across Risk Capital and Human Capital, supporting convergence toward $338.37 with an attractive implied return of 22.6% from the price of $275.95.
Miss
Downgrade the rating; Pause further capital additions, reassess the margin durability thesis, and review whether producer compensation guarantees or commercial casualty pricing weakness represent structural rather than temporary headwinds.
A material revenue miss driven by commercial insurance pricing softening or broker talent defections that inflates compensation expenses would falsify the operating leverage thesis and impair projected cash flow growth.
Aon demonstrates high earnings quality characterized by robust conversion of accounting operating profits into discretionary free cash flow, supported by minimal physical capital expenditure requirements in an asset-light corporate broking model. Working capital needs remain modest, with cash collections tracking insurance policy renewals and consulting engagements. Employee stock-based compensation remains contained relative to operating cash generation and is more than offset by regular share repurchases, ensuring reported adjusted net income reflects genuine cash earnings power.
Operating margin expansion reveals operating leverage from Aon Business Services and technology investments, showing whether broking commissions grow faster than personnel and overhead expenses.
03
Metric:
Broker Talent Retention and Producer Productivity
CurrentIndustry recruitment competition remains fierce across specialty lines, though recent hiring cohorts contribute positively to targeted sectors.
Why it matters
Insurance broking depends on key producing talent; aggressive poaching by acquisitive peers could force defensive compensation guarantees that compress operating margins.
Discretionary cash conversion determines management ability to execute share repurchases, service debt maturities, and fund strategic platform investments without external financing.
05
Metric:
United Kingdom and London Market Placement Volume
CurrentUK operations continue to provide stable wholesale risk distribution and steady growth in pension risk transfer solutions.
Why it matters
The London specialty market serves as Aon premier global wholesale reinsurance bridgehead; maintaining placement market share protects high-margin syndication fee pools.
Aon operates a premier cash generation engine. In FY2025, operating cash flow reached $3,481M, even after absorbing $678M in foreign currency exchange headwinds. With capital expenditures of just $263M —reflecting an asset-light brokerage model where D&A is $966M—free cash flow stood at $3,218M. Stock-based compensation of $432M in FY2025 represented only 2.51% of revenue, comfortably below annual share repurchases and preserving cash returns to equity holders.6,7
Management maintains a disciplined, balanced capital allocation framework. Share repurchases represent the primary vehicle for returning capital to shareholders, deploying $1.1B in 1H2026 with over $7B in remaining authorized repurchase capacity. Capital deployment in 1H2026 was 79% directed toward shareholder returns, predominantly buybacks that drive an annual diluted share count reduction of 0.5% (diluted shares at 217.1M in FY2025). Reinvestment into internal technology via Aon Business Services remains modest at an 8.0% net reinvestment rate, preserving substantial liquidity to manage upcoming debt maturities across its $15.87B debt structure.
The stability of Aon's ROIC above cost of capital reflects its asset-light brokerage architecture, where operating income reached $4,344M in FY2025 on minimal capital expenditures ($263M). While historical share repurchases reduce accounting equity balances, normalized cash returns on operating capital remain exceptionally durable.
Aon's latest ROIC of 15.55% comfortably exceeds its computed WACC of 7.3532% and computed moderate cost of equity of 8.0669%, generating an excess return spread of over 800 basis points.
Industry-Leading Operating Profitability Sustained Above Peer Group
Aon achieved an operating margin of 25.28% on $4,344M of EBIT in FY2025, outperforming closest peer AJG at 19.16% and the industry benchmark of 21.5%.
Scale efficiencies and shared enterprise services through Aon Business Services allow Aon to convert top-line broking commissions into superior cash profitability, creating operating cushion against talent recruiting inflation.
Exceptional Cash Flow Conversion Underpins Capital Flexibility
Low reinvestment requirements (net reinvestment rate of 8.0%) provide robust discretionary liquidity to fund share repurchases ($1.1B in 1H2026) while servicing debt maturities.
Aon carries $15.87B in total debt with a pre-tax cost of debt of 5.91% in a 5.26% risk-free rate environment, representing a debt weight of 21.33% of total enterprise value.
While cash generation remains robust, debt service and refinancing at prevailing higher rates absorb financial flexibility, necessitating a balanced posture between share repurchases and debt reduction.
Aon plc (AON) trades at 13.5x forward earnings against a peer median of 13.8x. Its EV/EBITDA of 12.4x compares with a peer median of 13.7x. The comparison uses 4 peers: Arthur J. Gallagher & Co., Erie Indemnity Company, The Travelers Companies Inc. and MetLife Inc., as of 2026-10-02.
The downside cycle occurs during broad softening across commercial property and casualty pricing. In a soft market, commercial insurance premium rates decline, which depresses ad-valorem brokerage commissions and fee pool growth across core Risk Capital placements ($11,290M FY2025 revenue). When lower rates coincide with heightened talent raiding from acquisitive peers like AJG and sluggish enterprise M&A transaction volumes, organic revenue growth decelerates toward 2.0% and operating margins compress.
Secular trends
Trend
Impact
Note
Rising Global Risk Complexity Across Climate, Cyber, and Infrastructure
positive
Escalating severity and frequency of climate-driven property losses, sophisticated cyber threats, and massive technological builds—such as data center facilities where Aon's advisory pipeline has expanded more than three-fold —demand institutional risk calibration and alternative reinsurance capital.
Enterprise Workforce Transformation and Healthcare Cost Inflation
positive
Multinational corporations face rising employee healthcare expenses, evolving benefits requirements, and complex pension risk transfers, driving persistent 5% organic growth in Aon's Wealth advisory and health analytics, reinforcing the Human Capital segment ($5,907M FY2025 revenue).
Industry Consolidation and Heightened Competition for Producing Brokers
neutral
Large brokers continue acquiring middle-market agencies, while aggressive peers like AJG (compounding at 13% forward growth) intensify competition for producer teams, necessitating defensive compensation structures that bound near-term margin expansion.
Positioning
Aon occupies an elite global duopoly position alongside Marsh McLennan, operating as an indispensable intermediary between commercial enterprises and risk capital syndicates. Aon generated $11,290M in Risk Capital revenue and $5,907M in Human Capital revenue in FY2025, producing an operating margin of 25.28% that substantially surpasses peer AJG's 19.16% and industry benchmark of 21.5%. With critical wholesale placement facilities anchored in the United Kingdom ($2,220M FY2025 revenue), Aon is positioned to capture demand from major structural themes including energy transition, AI infrastructure, and pension de-risking.3,7,8
Entry tranches
Level
Action
Why
At or below $276.00
Initiate starter position (approx. one-third of target allocation)
The October 1, 2026 price of $275.95 represents an 18.45% discount to compositefair value of $338.37 and trades at an attractive 13.48x forward P/E.
While near-term organic revenue growth moderated to 3% in 1H 2026, full-year mid-single-digit guidance and inorganic integration support forward EPS expansion from $18.74 in FY2026 to $20.29 in FY2027.1,5
Investors receive exposure to a premier asset-light corporate service provider trading at an attractive 13.48x forward P/E multiple, well below peer AJG at 15.60x. Capital allocation remains shareholder-friendly, with $1.1B repurchased in 1H 2026 under an authorized capacity exceeding $7B.
Not every cited input appears here: internal calculations and intermediate model outputs have no external record, and some citations could not be matched to one.
Discounted forecast-period cash flows ($81.57) plus discounted terminal value ($362) minus signed net debt per current share ($58.70) equals the $385 lens value shown above. Negative net debt is net cash, so subtracting it raises value.
