Castle Biosciences, Inc. (CSTL)

Castle Biosciences Employees

Castle Biosciences had 1,048 employees as of September 30, 2026. The number of employees increased by 225 or 27.34% compared to the same quarter last year. That makes Castle Biosciences the 14,511th largest employer in the world and 2,145th in the United States.

• Employees: 1,048
• Change (1Y): 225
• Growth (1Y): 27.34%
• Revenue / Employee: $359,853
• Profits / Employee: -$21,960
• Market Cap: 1.00B

Employees Chart

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Employees History

Date	Employees	Change (1Y)	Growth (1Y)	Full-Time	Part-Time
Sep 30, 2026	1,048	225	27.34%	1,048	0
Jun 30, 2026	1,002	204	25.56%	1,002	0
Mar 31, 2026	942	158	20.15%	942	0
Dec 31, 2025	883	122	16.03%	883	0
Sep 30, 2025	823	113	15.92%	823	0
Jun 30, 2025	798	95	13.51%	798	0
Mar 31, 2025	784	146	22.88%	784	0
Dec 31, 2024	761	151	24.75%	761	0
Sep 30, 2024	710	123	20.95%	710	0
Jun 30, 2024	703	121	20.79%	703	0
Mar 31, 2024	638	95	17.50%	638	0
Dec 31, 2023	610	67	12.34%	610	0
Sep 30, 2023	587	70	13.54%	587	0
Jun 30, 2023	582	100	20.75%	582	0
Dec 31, 2022	543	198	57.39%	542	1
Sep 30, 2022	517	206	66.24%	517	0
Jun 30, 2022	482	190	65.07%	482	0

Data Source: S&P Global Market Intelligence Last updated: Sep 30, 2026

Employee data is provided by S&P Global Market Intelligence and updates every three months after the filing of each quarterly report.

Update frequency:

Quarterly

Last checked:

Nov 7, 2026

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