White Mountains Insurance price to book ratio WTM

Market value divided by the book value of the company's net assets, since 2010.

Today, Oct 23, 2026: 1.0×
10-year median: 1.0×
Against its 10-year history: 43rd; percentile: 0 is its lowest day, 100 its highest
10-year range: 0.7× to 1.2×
Peer median: 2.2×

White Mountains Insurance's price to book ratio is 1.0× as of Oct 23, 2026.

That is below its ten-year median of 1.0×, close to the middle of its last ten years.

Over that time it ranged from 0.7× in Mar 2020 to 1.2× in Oct 2022.

The median for 10 property and casualty insurers of a similar size is 2.2×.

Price to book ratio over time

median 1×

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	1.0×	0.9×	1.2×
2025	1.1×	1.0×	1.1×
2024	1.1×	1.0×	1.2×
2023	1.0×	0.9×	1.1×
2022	1.0×	0.9×	1.2×
2021	0.9×	0.8×	1.1×
2020	0.9×	0.7×	1.1×
2019	1.1×	0.9×	1.1×
2018	0.9×	0.9×	1.1×
2017	0.9×	0.9×	1.2×
2016	1.0×	1.0×	1.2×
2015	1.1×	0.9×	1.2×
2014	1.0×	0.9×	1.0×
2013	1.0×	0.9×	1.0×
2012	0.9×	0.9×	1.1×
2011	1.0×	0.8×	1.0×
2010	0.8×	0.7×	0.8×

Against its peers

Companies in Insurance - Property & Casualty nearest White Mountains Insurance's size, closest first, today.

Company	Price to book ratio
WTMWhite Mountains Insurance	1.0×
MCYMercury General	2.0×
SIGISelective Insurance	1.7×
RLIRLI	3.5×
AXSAxis Capital	1.2×
PLMRPalomar	3.8×
THGHanover Insurance	2.3×
KNSLKinsale Capital	4.1×
SLDESlide Insurance	2.8×
SPNTSiriusPoint	1.3×
SKWDSkyward Specialty Insurance	2.1×
Peer median	2.2×

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 White Mountains Insurance

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