How many employees work at 3SI Security Systems?
3SI Security Systems, Inc. has approximately 363 total employees worldwide as of March 2026, according to Revelio Labs workforce intelligence data. 3SI Security Systems’s total headcount has declined 0.3% from 364 employees in 2023 to 363 in 2026.
Is 3SI Security Systems hiring right now?
Yes, 3SI Security Systems is actively hiring. 3SI Security Systems had 8 active job postings in 2026, a 46.2% increase from 2025 — see job openings & hiring trends.
About 3SI Security Systems’s Workforce
3SI Security Systems, Inc. is a Facility Management Services company that employs 363 people worldwide as of March 2026. It is the 11th-largest by headcount among its peers. Founded in 1971, the company is headquartered in Malvern, Pennsylvania.
3SI Security Systems's workforce has held roughly steady from 2023 to 2026, down 3.5% year over year in 2026. It fell to a low of 360 in 2025 Q4 before recovering. Its workforce is concentrated most in North America (85.6%), followed by Western Europe (6.0%) and South Asia (2.4%).
3SI Security Systems's functional groups are Finance and Operations (43.8%), Engineering (32.8%), and Sales and Marketing (23.4%). The average salary is $87,638, ranging from a median of $77,000 in North America to $10,000 in South Asia, up 0.9% year over year in 2026.
3SI Security Systems's active job postings rose 46.2% in 2026 to 8, with new postings per month cooling from 21 in 2023 to 5 in 2026. Overall employee sentiment is negative and declining.
Sourced from Revelio Labs workforce data.
- Headquarters
- Malvern, Pennsylvania
- Founded
- 1971
- Industry
- Facility Management Services
- Employees
- 363
- YoY
- -3.5% (-12)
As of March 2026
3SI Security Systems workforce metrics
Unlock hiring rate, attrition rate, and 12 additional workforce metrics for 3SI Security Systems. Compare to peers, export the dataset, and access the full quarterly history.
Unlock Metrics3SI Security Systems Annual Employee Count (2023-2026)
- 3SI Security Systems had 363 employees in 2026, a 3.5% decline (-12) from 2025.
- 3SI Security Systems had 360 employees in 2025, a 2.9% decline (-15) from 2024.
- 3SI Security Systems had 375 employees in 2024, a 2.3% increase (+13) from 2023.
- 3SI Security Systems had 362 employees in 2023, a 1.2% increase (+7) from 2022.
3SI Security Systems's total workforce has grown from 360 employees in 2025 to 363 in 2026. 3SI Security Systems's headcount peaked at 377 in 2025 before declining in 2025 and recovering through 2026.
3SI Security Systems, Inc. quarterly employee count
| Year | Qtr | Employees | YoY Change | YoY % |
|---|---|---|---|---|
| 2026 | Q1 | 363 | -12 | -3.5% |
| 2025 | Q4 | 360 | -15 | -2.9% |
| 2025 | Q3 | 368 | +5 | -1.3% |
| 2025 | Q2 | 377 | +15 | +1.6% |
| 2025 | Q1 | 375 | +8 | +1.5% |
| 2024 | Q4 | 375 | +13 | +2.3% |
| 2024 | Q3 | 363 | +2 | +1.5% |
| 2024 | Q2 | 362 | -2 | -0.1% |
| 2024 | Q1 | 367 | +9 | +2.0% |
| 2023 | Q4 | 362 | +7 | +1.2% |
| 2023 | Q3 | 361 | +14 | +2.4% |
| 2023 | Q2 | 364 | +6 | +2.6% |
See 3SI Security Systems's complete headcount history, including quarterly breakdowns.
Get the Data3SI Security Systems Employee Count by Region (2026)
North America accounts for the largest share of 3SI Security Systems's global workforce with approximately 86% of total employees, followed by Western Europe and South Asia.
3SI Security Systems employees by region
| Region | Employees | % of Total |
|---|---|---|
| North America | 305 | 85.6% |
| Western Europe | 21 | 6.0% |
| South Asia | 9 | 2.4% |
| Northern Europe | 7 | 2.1% |
| Southeast Asia | 7 | 1.9% |
| Sub-Saharan Africa | 2 | 0.5% |
| Pacific Islands | 1 | 0.4% |
| South America | 1 | 0.3% |
| Arab States | 1 | 0.3% |
| North Africa | 1 | 0.3% |
Drill into city-level data, hiring trends by region, and historic geographic shifts.
Unlock Geographic Data3SI Security Systems Employee Count by Department (2026)
3SI Security Systems's employee groups are Finance and Operations (43.8%), Engineering (32.8%), and Sales and Marketing (23.4%).
3SI Security Systems employees by department
| Department | Employees | % of Total |
|---|---|---|
| Finance and Operations | 157 | 43.8% |
| Engineering | 117 | 32.8% |
| Sales and Marketing | 84 | 23.4% |
Compare 3SI Security Systems's department mix to industry peers.
See Full Data3SI Security Systems Employee Salary by Region (2026)
3SI Security Systems's average employee salary is $87,638 globally. Employees in North America receive the highest compensation. Pay is lowest in South Asia, at a median of $10,000.
3SI Security Systems median employee salary by region (USD)
| Region | Median Salary |
|---|---|
| North America | $77,000 |
| Northern Europe | $54,000 |
| Western Europe | $36,000 |
| Southeast Asia | $15,000 |
| South Asia | $10,000 |
Unlock salary by role, level, and city — and compare to 3SI Security Systems's industry peers.
Unlock Salary Data3SI Security Systems Job Openings and Hiring Trends (2023-2026)
- 3SI Security Systems had 8 active job postings in 2026, a 46.2% increase (+5) from 2025.
- 3SI Security Systems had 3 active job postings in 2025, a 114.3% decline (-8) from 2024.
- 3SI Security Systems had 11 active job postings in 2024, a 42.9% decline (-6) from 2023.
- 3SI Security Systems had 17 active job postings in 2023, a 26.7% increase from 2022.
- Hiring velocity in 2026: 5 new roles/month, down from 9 in 2025 and 11 in 2024.
3SI Security Systems's active job postings rose 46.2% in 2026 to 8, with new postings per month cooling from 21 in 2023 to 5 in 2026.
Track new postings per month, role-level demand, and hiring velocity vs. peers.
Unlock Hiring Data3SI Security Systems Employee Sentiment (2026)
Revelio Labs tracks employee sentiment across 3SI Security Systems'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.
Unlock SentimentSimilar Companies
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Frequently Asked Questions About 3SI Security Systems
- How fast is 3SI Security Systems growing?
- In 2026, 3SI Security Systems's headcount shrank 3.5% to 363 employees, down from 375 in 2025.
- See the full headcount history
- Where are 3SI Security Systems employees located?
- Most 3SI Security Systems employees are based in North America (85.6% of headcount), followed by Western Europe and South Asia.
- Explore where the workforce is based
- What is the average salary at 3SI Security Systems?
- The average employee salary at 3SI Security Systems is approximately $87.6k per year.
- Analyze the salary distribution
- How many new job postings does 3SI Security Systems open per year?
- In Q1 2026, 3SI Security Systems opened 16 new job postings. In 2025, 3SI Security Systems opened 104 new job postings — about 9 per month.
- Track hiring trends by role
- When was 3SI Security Systems founded and where is it headquartered?
- 3SI Security Systems was founded in 1971 and is headquartered in Malvern, Pennsylvania.
- Compare 3SI Security Systems to industry peers
Speak with a workforce expert about 3SI Security Systems.
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