Aon plc

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 valuation multiples de-rate from current forward P/E of 13.48x toward 11.0x, compressing equity value toward the downside scenario valuation target of 259.81 USD.

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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.

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.

We recommend purchasing shares of Aon plc based on a composite Fair 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

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.