How many employees does Castle Biosciences, Inc. have?

Castle Biosciences, Inc. reported 883 employees for the fiscal year ending Dec 2025, in the annual report it filed on February 26, 2026. That is up 16.0% from a year earlier.

What is Castle Biosciences, Inc.'s revenue per employee?

Castle Biosciences, Inc. brought in $344M of revenue in fiscal Dec 2025, which is $390K per employee. That ranks 10 of 26 companies we track in Medical - Diagnostics & Research, where the median is $366K.

Where do these numbers come from?

Employee counts and revenue are taken from each company's own annual report (Form 10-K). Open roles are counted from the company's public job board where we have matched one. Companies report headcount once a year, sometimes rounded, so small changes can be noise.

Company data

Castle Biosciences, Inc. employees and revenue per employee

CSTL · Medical - Diagnostics & Research · $1.05B market cap

Castle Biosciences, Inc. had 883 employees at the end of fiscal Dec 2025, up 16.0% from a year earlier. Revenue for the year was $344M, up 3.7% from a year earlier, or $390K per employee. Headcount grew faster than revenue.

Employees

883

+16.0% YoY

Revenue

$344M

+3.7% YoY

Revenue / employee

$390K

Peer median $366K

Rank in industry

10 of 26

Medical - Diagnostics & Research

Headcount against revenue

Both lines start at 100 in the first year we hold, so you can see which one grew faster.

EmployeesRevenueIndexed to 100 in Dec 2019

Hover a year for the numbers.

CSTL employees and revenue by fiscal year
Year ending	Employees	Revenue	Per employee	Staff YoY	Revenue YoY
Dec 2025	883	$344M	$390K	+16.0%	+3.7%
Dec 2024	761	$332M	$436K	+24.8%	+51.1%
Dec 2023	610	$220M	$360K	+12.5%	+60.4%
Dec 2022	542	$137M	$253K	+58.5%	+45.7%
Dec 2021	342	$94.1M	$275K	+71.9%	+50.2%
Dec 2020	199	$62.6M	$315K	+49.6%	+20.8%
Dec 2019	133	$51.9M	$390K	—	—

Open roles: we have not matched a verified job board for this company yet.

Employees, last six fiscal years

Revenue per employee, last six fiscal years

Castle Biosciences, Inc. against similar companies

The closest industry peers by revenue, from Medical - Diagnostics & Research.

Company	Employees	Revenue	Revenue / employee	Shape
VCYT Veracyte, Inc.	755	$517M	$685K	Leaner
CDNA CareDx, Inc	761	$380M	$499K	Hiring ahead
BLLN BillionToOne, Inc.	713	$305M	$428K	—
GH Guardant Health, Inc.	2,490	$982M	$394K	Efficient growth
CSTL Castle Biosciences, Inc.	883	$344M	$390K	Hiring ahead
WGS GeneDx Holdings Corp.	1,300	$428M	$329K	Efficient growth
NEO NeoGenomics, Inc.	2,500	$727M	$291K	Hiring ahead
FLGT Fulgent Genetics, Inc.	1,300	$323M	$248K	Hiring ahead
GRAL GRAIL Inc.	910	$147M	$162K	Leaner

Every Healthcare company

Questions about Castle Biosciences, Inc.

How many employees does Castle Biosciences, Inc. have?: Castle Biosciences, Inc. reported 883 employees for the fiscal year ending Dec 2025, in the annual report it filed on February 26, 2026. That is up 16.0% from a year earlier.
What is Castle Biosciences, Inc.'s revenue per employee?: Castle Biosciences, Inc. brought in $344M of revenue in fiscal Dec 2025, which is $390K per employee. That ranks 10 of 26 companies we track in Medical - Diagnostics & Research, where the median is $366K.
Where do these numbers come from?: Employee counts and revenue are taken from each company's own annual report (Form 10-K). Open roles are counted from the company's public job board where we have matched one. Companies report headcount once a year, sometimes rounded, so small changes can be noise.

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Source: employee counts and revenue as stated in Castle Biosciences, Inc.'s annual reports (Form 10-K), latest filed February 26, 2026. This is data, not a recommendation to buy or sell CSTL.