How many employees work at Quantum-Si?
Quantum-Si, Inc. (QSI) has approximately 149 total employees worldwide as of March 2026, according to Revelio Labs workforce intelligence data. Quantum-Si’s total headcount has declined 16.8% from 179 employees in 2023 to 149 in 2026.
Is Quantum-Si hiring right now?
Yes, Quantum-Si is actively hiring. Quantum-Si had 17 active job postings in 2026, a 83.3% increase from 2025 — see job openings & hiring trends.
About Quantum-Si’s Workforce
Quantum-Si, Inc. (QSI) is a Biotech and Healthcare Services company that employs 149 people worldwide as of March 2026. It is the 4th-largest by headcount among its peers. Founded in 2013, the company is headquartered in Branford, Connecticut and trades on the NASDAQ.
Quantum-Si's workforce has declined 16.8% from 2023 to 2026, down 0.4% year over year in 2026. It fell to a low of 145 in 2025 Q3 before recovering. Its workforce is concentrated most in North America (91.1%), followed by Western Europe (4.6%) and Northern Europe (1.9%).
Quantum-Si's functional groups are Engineering (38.9%), Finance and Operations (38.6%), and Sales and Marketing (22.5%), with Engineering growing fastest (up 4.9%). The average salary is $140,170, ranging from a median of $129,000 in North America to $85,000 in Northern Europe, down 1.2% year over year in 2026.
Quantum-Si's active job postings rose 83.3% in 2026 to 17, with new postings per month cooling from 21 in 2023 to 6 in 2026. Overall employee sentiment is neutral but improving.
Sourced from Revelio Labs workforce data.
- Ticker
- NASDAQ: QSI
- Headquarters
- Branford, Connecticut
- Founded
- 2013
- Industry
- Biotech and Healthcare Services
- Employees
- 149
- YoY
- -0.4% (+1)
As of March 2026
Quantum-Si workforce metrics
Unlock hiring rate, attrition rate, and 12 additional workforce metrics for Quantum-Si. Compare to peers, export the dataset, and access the full quarterly history.
Unlock MetricsQuantum-Si Annual Employee Count (2023-2026)
- Quantum-Si had 149 employees in 2026, a 0.4% decline (+1) from 2025.
- Quantum-Si had 145 employees in 2025, a 1.2% decline (-7) from 2024.
- Quantum-Si had 152 employees in 2024, a 11.6% decline (-10) from 2023.
- Quantum-Si had 162 employees in 2023, a 15.0% decline (-17) from 2022.
Quantum-Si's total workforce has grown from 145 employees in 2025 to 149 in 2026. Quantum-Si's headcount peaked at 182 in 2024 before declining in 2025 and recovering through 2026.
Quantum-Si, Inc. quarterly employee count
| Year | Qtr | Employees | YoY Change | YoY % |
|---|---|---|---|---|
| 2026 | Q1 | 149 | +1 | -0.4% |
| 2025 | Q4 | 145 | -7 | -1.2% |
| 2025 | Q3 | 145 | -37 | -14.4% |
| 2025 | Q2 | 148 | -27 | -13.8% |
| 2025 | Q1 | 148 | -24 | -14.0% |
| 2024 | Q4 | 152 | -10 | -11.6% |
| 2024 | Q3 | 182 | +20 | +0.1% |
| 2024 | Q2 | 175 | -4 | -9.2% |
| 2024 | Q1 | 172 | +2 | -9.2% |
| 2023 | Q4 | 162 | -17 | -15.0% |
| 2023 | Q3 | 162 | -14 | -11.6% |
| 2023 | Q2 | 179 | +11 | -1.8% |
See Quantum-Si's complete headcount history, including quarterly breakdowns.
Get the DataQuantum-Si Employee Count by Region (2026)
North America accounts for the largest share of Quantum-Si's global workforce with approximately 91% of total employees, followed by Western Europe and Northern Europe.
Quantum-Si employees by region
| Region | Employees | % of Total |
|---|---|---|
| North America | 132 | 91.1% |
| Western Europe | 7 | 4.6% |
| Northern Europe | 3 | 1.9% |
| South Asia | 1 | 1.0% |
| Southeast Asia | 1 | 0.6% |
| Southern Europe | 1 | 0.5% |
| South America | 0 | 0.3% |
Drill into city-level data, hiring trends by region, and historic geographic shifts.
Unlock Geographic DataQuantum-Si Employee Count by Department (2026)
Quantum-Si's employee groups are Engineering (38.9%), Finance and Operations (38.6%), and Sales and Marketing (22.5%).
Quantum-Si employees by department
| Department | Employees | % of Total |
|---|---|---|
| Engineering | 58 | 38.9% |
| Finance and Operations | 57 | 38.6% |
| Sales and Marketing | 33 | 22.5% |
Compare Quantum-Si's department mix to industry peers.
See Full DataQuantum-Si Employee Salary by Region (2026)
Quantum-Si's average employee salary is $140,170 globally. Employees in North America receive the highest compensation. Pay is lowest in Northern Europe, at a median of $85,000.
Quantum-Si median employee salary by region (USD)
| Region | Median Salary |
|---|---|
| North America | $129,000 |
| Western Europe | $99,000 |
| Northern Europe | $85,000 |
Unlock salary by role, level, and city — and compare to Quantum-Si's industry peers.
Unlock Salary DataQuantum-Si Job Openings and Hiring Trends (2023-2026)
- Quantum-Si had 17 active job postings in 2026, a 83.3% increase (+10) from 2025.
- Quantum-Si had 7 active job postings in 2025, a 52.6% decline (-5) from 2024.
- Quantum-Si had 12 active job postings in 2024, a 58.8% decline (-10) from 2023.
- Quantum-Si had 22 active job postings in 2023, a 66.7% decline from 2022.
- Hiring velocity in 2026: 6 new roles/month, up from 4 in 2025 and 14 in 2024.
Quantum-Si's active job postings rose 83.3% in 2026 to 17, with new postings per month cooling from 21 in 2023 to 6 in 2026.
Track new postings per month, role-level demand, and hiring velocity vs. peers.
Unlock Hiring DataQuantum-Si Employee Sentiment (2026)
Revelio Labs tracks employee sentiment across Quantum-Si's workforce based on public professional data. Overall sentiment is neutral and has improved year over year in 2026.
Overall
Unlock the full sentiment breakdown by department, tenure, and trend over time.
Unlock SentimentSimilar Companies
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Frequently Asked Questions About Quantum-Si
- How fast is Quantum-Si growing?
- In 2026, Quantum-Si's headcount shrank 0.4% to 149 employees, up from 148 in 2025.
- See the full headcount history
- Where are Quantum-Si employees located?
- Most Quantum-Si employees are based in North America (91.1% of headcount), followed by Western Europe and Northern Europe.
- Explore where the workforce is based
- What is the average salary at Quantum-Si?
- The average employee salary at Quantum-Si is approximately $140.2k per year.
- Analyze the salary distribution
- How many new job postings does Quantum-Si open per year?
- In Q1 2026, Quantum-Si opened 19 new job postings. In 2025, Quantum-Si opened 42 new job postings — about 4 per month.
- Track hiring trends by role
- When was Quantum-Si founded and where is it headquartered?
- Quantum-Si was founded in 2013 and is headquartered in Branford, Connecticut.
- Compare Quantum-Si to industry peers
Speak with a workforce expert about Quantum-Si.
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