What is AON's five-year median P/E?

The median, or middle weekly reading, is 27.1× over the last five years. Available history contains 533 weekly observations from Aug 8, 2016 to Oct 19, 2026.

Does a low historical rank mean a stock is a buy?

No. The rank describes a stock’s own history. Changes in growth, financial risk and the business can change the multiple investors pay. P/E uses earnings and P/S uses revenue from the previous twelve months.

Aon plc (AON) valuation history

Historically low

As of Oct 22, 2026

AON's P/E of 16.2x is lower than 98% of its available weekly readings from the last five years.

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P/E at year-end

Last weekly reading of each completed year. Rank runs from lowest (0%) to highest (100%) within the five years available on that date.

AON year-end valuation history
Reading date	P/E	5-year rank
Dec 29, 2025	27.6×	44%
Dec 30, 2024	29.9×	67%
Dec 25, 2023	22.1×	1%
Dec 26, 2022	23.4×	5%
Dec 27, 2021	76.3×	100%
Dec 28, 2020	27.3×	48%
Dec 30, 2019	33.7×	70%
Dec 31, 2018	46.8×	89%
Dec 25, 2017	20.9×	47%
Dec 26, 2016	20.1×	Short history

Peers on the same measure

Stock	P/E	5-year rank
AJGArthur J. Gallagher & Co.	42.9×	56%
BROBrown & Brown	22.3×	11%
MRSHMarsh McLennan	22.8×	19%
WTWWillis Towers Watson	19.7×	36%

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Financials Stocks with Low P/E Ratios and Steady Revenue Growth Stocks Below Their 5-Year Median P/E Stocks Near Their Lowest P/E Ratios in 5 Years

Research on AON

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About this history

What is AON's current P/E?: AON's P/E of 16.2x is lower than 98% of its available weekly readings from the last five years.
What is AON's five-year median P/E?: The median, or middle weekly reading, is 27.1× over the last five years. Available history contains 533 weekly observations from Aug 8, 2016 to Oct 19, 2026.
Does a low historical rank mean a stock is a buy?: No. The rank describes a stock’s own history. Changes in growth, financial risk and the business can change the multiple investors pay. P/E uses earnings and P/S uses revenue from the previous twelve months.