Castle Biosciences price to book ratio CSTL

Market value divided by the book value of the company's net assets, since 2019.

Today, Oct 23, 2026: 2.1×
7-year median: 1.8×
Against its 7-year history: 61st; percentile: 0 is its lowest day, 100 its highest
7-year range: 0.9× to 11.4×
Peer median: 8.4×

Castle Biosciences' price to book ratio is 2.1× as of Oct 23, 2026.

That is above its 7-year median of 1.8×, close to the middle of its last 7 years.

Over that time it ranged from 0.9× in Oct 2023 to 11.4× in Feb 2021.

The median for 7 diagnostics and research stocks of a similar size is 8.4×.

Price to book ratio over time

Open the interactive chart, with overlays and comparisons

Year by year

Year	End of year	Low	High
2026 so far	2.1×	1.3×	2.6×
2025	2.5×	1.0×	2.5×
2024	1.7×	1.2×	2.2×
2023	1.5×	0.9×	1.8×
2022	1.5×	1.1×	2.8×
2021	2.6×	2.5×	11.4×
2020	8.0×	4.9×	8.5×
2019	7.0×	5.6×	7.0×

Against its peers

Companies in Medical - Diagnostics & Research nearest Castle Biosciences' size, closest first, today.

Company	Price to book ratio
CSTLCastle Biosciences	2.1×
NRCNRC Health	74.1×
CDNACareDx	8.4×
VCYTVeracyte	2.8×
BLLNBillionToOne	9.5×
LNTHLantheus	5.0×
CAICaris Life Sciences	15.3×
BIOBio-Rad Laboratories	1.4×
Peer median	8.4×

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 Castle Biosciences

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