Aon PLC
NYSE: AON · FINANCIAL SERVICES · INSURANCE BROKERS
Updated 2026-04-29
Aon PLC (AON) Stock Valuation Analysis
Fair value estimate, historical valuation range, and quality signals for AON.
Valued
Valuation reasonably reflects current fundamentals. Limited margin of safety at these levels.
AON historical valuation range
Where current P/E sits in AON's own 5Y range.
AON intrinsic value (DCF)
DCF-based fair value estimate vs current market price.
Standard discounted cash flow models produce unreliable output for unprofitable or near-breakeven companies. Revenue-based multiples such as P/S and EV/Sales, combined with the historical valuation position above, give a more reliable read for this stock.
Intrinsic value calculated using discounted cash flow (DCF) model based on projected free cash flows, discount rate, and terminal growth assumptions. A positive margin of safety indicates the current price is below estimated fair value, providing a cushion against estimation error.
AON valuation signals
Quick-read green flags, caution flags, and risks based on current metrics.
P/E Ratio — History
Current: 18.87x
P/S Ratio — History
Current: 4.02x
Is AON overvalued in 2026?
Aon PLC (AON) currently trades at $322.49 per share with a market capitalization of $69,024,317,000.00. Based on our multi-factor framework, the stock trades at a fair valuation with a Smart Value Score of 68/100. This score blends growth quality, financial health, and price attractiveness into a single institutional-grade read.
The stock trades at a P/E ratio of 18.9x, below its 5-year median of 25.3x. The PEG ratio of 2.55 indicates the price has run ahead of the underlying growth rate.
Looking at its own history, AON is currently trading cheaper than 92% of the last 5Y on P/E. This places it in the 8th percentile of its historical range, a level that has historically coincided with attractive entry points.
A standard DCF model does not produce reliable output for AON under current conditions. For unprofitable or near-breakeven companies, revenue-based multiples such as EV/Sales and historical P/S percentile are more informative than intrinsic value calculations.
The Piotroski F-Score of 5/9 puts financial quality in a middling range, neither a standout strength nor an obvious red flag.
Bottom line: AON trades at a fair valuation on our framework, with a Smart Value Score of 68/100. The valuation is defensible but offers no obvious bargain. Patience or a better entry price may reward disciplined buyers.
Frequently asked questions
Is AON overvalued in 2026?
Based on a Smart Value Score of 68/100, AON is fairly valued. Price reasonably reflects current fundamentals with limited cushion in either direction.
What is AON's fair value?
Standard DCF is unreliable for AON due to its current profitability profile. Revenue-based approaches such as EV/Sales or historical P/S percentile are more informative for this stock.
What P/E ratio does AON trade at?
AON trades at a P/E of 18.9x on trailing twelve-month earnings, compared to its 5-year median of 25.3x.
Is AON a buy based on valuation?
WallStSmart does not issue buy or sell recommendations. Our Smart Value Score of 68/100 reflects the combined read on growth, quality, and price. The profile is balanced. Best suited for investors with an existing thesis.
How does AON's valuation compare to its history?
On P/E, AON currently sits in the 8th percentile of its own 5Y range. That is historically cheap relative to where it has traded over the period.
What is AON's Smart Value Score?
AON's Smart Value Score is 68/100. The Smart Value Score is a proprietary WallStSmart metric blending growth quality, financial health, and valuation attractiveness into a single 0-100 read. Scores above 75 are rare and indicate strong multi-factor alignment.