How many employees work at Castle Biosciences?
Castle Biosciences, Inc. (CSTL) has approximately 929 total employees worldwide as of March 2026, according to Revelio Labs workforce intelligence data. Castle Biosciences’s total headcount has grown 40.0% from 663 employees in 2023 to 929 in 2026.
Is Castle Biosciences hiring right now?
Yes, Castle Biosciences is actively hiring. Castle Biosciences had 43 active job postings in 2026, a 130.8% increase from 2025 — see job openings & hiring trends.
About Castle Biosciences’s Workforce
Castle Biosciences, Inc. (CSTL) is a Pharmaceuticals company that employs 929 people worldwide as of March 2026. It is the 4th-largest by headcount among its peers. Founded in 2007, the company is headquartered in Friendswood, Texas and trades on the NASDAQ.
Castle Biosciences's workforce has grown 40.0% from 2023 to 2026, up 1.7% year over year in 2026. It expanded from a low of 661 in 2023 Q3 to reach its current size, with the United States housing the vast majority of employees (98.8%), followed by India (0.3%) and Canada (0.3%), and Canada—its fastest-growing location—up 30.0%.
Castle Biosciences's largest functional groups are Engineering (39.8%), Finance and Operations (39.8%), and Sales and Marketing (20.4%), with Engineering growing fastest (up 15.2%). The average tenure is 2.2 years, and the median salary is $109,950, with the highest regional median in Northern America at $94,000.
Castle Biosciences's active job postings rose 130.8% in 2026 to 43, with new postings per month climbing from 16 in 2023 to 36 in 2026. Overall employee sentiment is negative and declining.
Sourced from Revelio Labs workforce data.
- Ticker
- NASDAQ: CSTL
- Headquarters
- Friendswood, Texas
- Founded
- 2007
- Industry
- Pharmaceuticals
- Employees
- 929
- YoY
- +1.7% (+131)
As of March 2026
Castle Biosciences workforce metrics
Unlock hiring rate, attrition rate, and 12 additional workforce metrics for Castle Biosciences. Compare to peers, export the dataset, and access the full quarterly history.
Unlock MetricsCastle Biosciences Annual Employee Count (2023-2026)
- Castle Biosciences had 929 employees in 2026, a 1.7% increase (+131) from 2025.
- Castle Biosciences had 886 employees in 2025, a 0.9% increase (+107) from 2024.
- Castle Biosciences had 779 employees in 2024, a 2.3% increase (+107) from 2023.
- Castle Biosciences had 672 employees in 2023, a 1.3% decline (+39) from 2022.
Castle Biosciences's total workforce has grown from 663 employees in 2023 to 929 in 2026.
Castle Biosciences, Inc. quarterly employee count
| Year | Qtr | Employees | YoY Change | YoY % |
|---|---|---|---|---|
| 2026 | Q1 | 929 | +131 | +1.7% |
| 2025 | Q4 | 886 | +107 | +0.9% |
| 2025 | Q3 | 817 | +71 | -0.8% |
| 2025 | Q2 | 811 | +67 | +0.2% |
| 2025 | Q1 | 798 | +89 | +1.2% |
| 2024 | Q4 | 779 | +107 | +2.3% |
| 2024 | Q3 | 746 | +85 | +2.4% |
| 2024 | Q2 | 744 | +81 | +3.0% |
| 2024 | Q1 | 709 | +54 | +1.1% |
| 2023 | Q4 | 672 | +39 | -1.3% |
| 2023 | Q3 | 661 | +46 | -1.3% |
| 2023 | Q2 | 663 | +84 | -2.2% |
See Castle Biosciences's complete headcount history, including quarterly breakdowns.
Get the DataCastle Biosciences Employee Count by Country and Region (2026)
The United States accounts for the largest share of Castle Biosciences's global workforce with approximately 99% of total employees, followed by India and Canada. Castle Biosciences's headcount in Canada is growing fastest among its major locations, up 30.0% year over year in 2026.
Castle Biosciences employees by country
| Country | Employees | % of Total | YoY % |
|---|---|---|---|
| United States | 886 | 98.8% | +8.6% |
| India | 3 | 0.3% | +0.0% |
| Canada | 3 | 0.3% | +30.0% |
| United Kingdom | 3 | 0.3% | +0.0% |
| Bangladesh | 1 | 0.1% | +0.0% |
| Nigeria | 1 | 0.1% | +0.0% |
Drill into city-level data, hiring trends by region, and historic geographic shifts.
Unlock Geographic DataCastle Biosciences Employee Count by Department (2026)
Castle Biosciences's largest employee groups are Engineering (39.8%), Finance and Operations (39.8%), and Sales and Marketing (20.4%).
Castle Biosciences employees by department
| Department | Employees | % of Total | YoY % |
|---|---|---|---|
| Engineering | 368 | 39.8% | +15.2% |
| Finance and Operations | 368 | 39.8% | +7.8% |
| Sales and Marketing | 189 | 20.4% | -0.9% |
Compare Castle Biosciences's department mix to industry peers.
See Full DataCastle Biosciences Employee Salary by Region (2026)
Castle Biosciences's average employee salary is $109,950 globally. Employees in Northern America receive the highest compensation.
Castle Biosciences median employee salary by region (USD)
| Region | Median Salary |
|---|---|
| Northern America | $94,000 |
Unlock salary by role, level, and city — and compare to Castle Biosciences's industry peers.
Unlock Salary DataCastle Biosciences Job Openings and Hiring Trends (2023-2026)
- Castle Biosciences had 43 active job postings in 2026, a 130.8% increase (+26) from 2025.
- Castle Biosciences had 17 active job postings in 2025, a 11.1% decline (-2) from 2024.
- Castle Biosciences had 19 active job postings in 2024, a 92.3% increase (+12) from 2023.
- Castle Biosciences had 7 active job postings in 2023, a 35.3% decline from 2022.
- Hiring velocity in 2026: 36 new roles/month, up from 20 in 2025 and 21 in 2024.
Castle Biosciences's hiring is accelerating: active job postings rose 130.8% in 2026 to 43, with new postings per month climbing from 16 in 2023 to 36 in 2026.
Track new postings per month, role-level demand, and hiring velocity vs. peers.
Unlock Hiring DataCastle Biosciences Employee Sentiment (2026)
Revelio Labs tracks employee sentiment across Castle Biosciences's workforce based on public professional data. Overall sentiment is negative and has declined year over year in 2026.
Overall
Unlock the full sentiment breakdown by department, tenure, and trend over time.
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Frequently Asked Questions About Castle Biosciences
- How fast is Castle Biosciences growing?
- In 2026, Castle Biosciences's headcount grew 1.7% to 929 employees, up from 798 in 2025.
- Where are Castle Biosciences employees located?
- Most Castle Biosciences employees are based in the United States (98.8% of headcount), followed by India and Canada.
- What is the average salary at Castle Biosciences?
- The average employee salary at Castle Biosciences is approximately $109.9k per year.
- How many people does Castle Biosciences hire per year?
- In 2026, Castle Biosciences opened roughly 432 new roles — about 36 per month.
- When was Castle Biosciences founded and where is it headquartered?
- Castle Biosciences was founded in 2007 and is headquartered in Friendswood, Texas.
Speak with a workforce expert about Castle Biosciences.
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