Aon price to book ratio AON

Market value divided by the book value of the company's net assets, since 2009.

Today, Oct 23, 2026: 6.7×
10-year median: 10.9×
Against its 10-year history: 17th; percentile: 0 is its lowest day, 100 its highest
10-year range: 5.2× to 93.0×
Peer median: 3.9×

Aon's price to book ratio is 6.7× as of Oct 23, 2026.

That is below its ten-year median of 10.9×, lower than on 83% of days in the last ten years.

Over that time it ranged from 5.2× in Nov 2016 to 93.0× in Aug 2022.

The median for 7 insurance brokers of a similar size is 3.9×.

Price to book ratio over time

median 10.9×

The dashed line is the 10-year median and the shaded band the middle half of its days.

Open the interactive chart, with overlays and comparisons

Year by year

Year	End of year	Low	High
2026 so far	6.7×	6.0×	9.5×
2025	9.7×	9.3×	14.4×
2024	12.5×	12.2×	13.9×
2023	n/m a value too high to mean anything
2022	89.2×	26.6×	93.0×
2021	30.0×	12.2×	30.0×
2020	13.6×	10.3×	15.9×
2019	13.9×	8.2×	14.1×
2018	8.1×	6.3×	9.3×
2017	6.5×	5.4×	7.0×
2016	5.4×	4.0×	5.6×
2015	4.3×	3.6×	4.6×
2014	3.8×	2.9×	3.8×
2013	3.3×	2.2×	3.3×
2012	2.1×	1.8×	2.2×
2011	1.8×	1.6×	2.5×
2010	2.2×	1.7×	2.2×
2009	1.8×	1.7×	2.0×

Against its peers

Companies in Insurance - Brokers nearest Aon's size, closest first, today.

Company	Price to book ratio
AONAon	6.7×
AJGArthur J. Gallagher	2.9×
MRSHMarsh & McLennan Companies	6.4×
WTWWillis Towers Watson Public	3.9×
BROBrown & Brown	1.9×
ERIEErie Indemnity	5.4×
RYANRyan Specialty	21.9×
ACTEnact	1.2×
Peer median	3.9×

What the price to book ratio tells you

Market value divided by the accounting value of the company's net assets. Below 1 means the market values the business at less than what it owns on paper.

Book value misses brands, software and people, so asset-light companies always look expensive on it. Most useful for banks and industrials.

More on Aon

Valuation data, not investment advice. Prices as of Oct 23, 2026. Reported figures come from the company's filings with the SEC.