How many employees work at O'Neill & Brennan?
O'Neill & Brennan Construction Ltd. has approximately 686 total employees worldwide as of March 2026, according to Revelio Labs workforce intelligence data. O'Neill & Brennan’s total headcount has declined 1.1% from 693 employees in 2023 to 686 in 2026.
Is O'Neill & Brennan hiring right now?
Yes, O'Neill & Brennan is actively hiring. O'Neill & Brennan had 487 active job postings in 2026, a 146.0% increase from 2025 — see job openings & hiring trends.
About O'Neill & Brennan’s Workforce
O'Neill & Brennan Construction Ltd. is an Engineering and Construction Services company that employs 686 people worldwide as of March 2026. It is the 10th-largest by headcount among its peers. Founded in 1990, the company is headquartered in London, United Kingdom.
O'Neill & Brennan's workforce has declined 1.1% from 2023 to 2026, down 1.3% year over year in 2026. It fell to a low of 674 in 2023 Q4 before recovering. Its workforce is concentrated most in Northern Europe (94.6%), followed by Western Europe (0.9%) and Sub-Saharan Africa (0.8%).
O'Neill & Brennan's functional groups are Sales and Marketing (40.6%), Finance and Operations (37.3%), and Engineering (22.1%), with Sales and Marketing growing fastest (up 0.6%). The average salary is $51,862, ranging from a median of $51,000 in Western Europe to $4,000 in South Asia, up 1.5% year over year in 2026.
O'Neill & Brennan's active job postings rose 146.0% in 2026 to 487, with new postings per month climbing from 27 in 2023 to 258 in 2026. Overall employee sentiment is positive and broadly stable.
Sourced from Revelio Labs workforce data.
- Headquarters
- London, United Kingdom
- Founded
- 1990
- Industry
- Engineering and Construction Services
- Employees
- 686
- YoY
- -1.3% (-20)
As of March 2026
O'Neill & Brennan workforce metrics
Unlock hiring rate, attrition rate, and 12 additional workforce metrics for O'Neill & Brennan. Compare to peers, export the dataset, and access the full quarterly history.
Unlock MetricsO'Neill & Brennan Annual Employee Count (2023-2026)
- O'Neill & Brennan had 686 employees in 2026, a 1.3% decline (-20) from 2025.
- O'Neill & Brennan had 696 employees in 2025, a 0.1% increase (+3) from 2024.
- O'Neill & Brennan had 693 employees in 2024, a 3.5% increase (+19) from 2023.
- O'Neill & Brennan had 674 employees in 2023, a 1.4% decline (-12) from 2022.
O'Neill & Brennan's total workforce has declined from 693 employees in 2023 to 686 in 2026. O'Neill & Brennan's headcount peaked at 710 in 2024.
O'Neill & Brennan Construction Ltd. quarterly employee count
| Year | Qtr | Employees | YoY Change | YoY % |
|---|---|---|---|---|
| 2026 | Q1 | 686 | -20 | -1.3% |
| 2025 | Q4 | 696 | +3 | +0.1% |
| 2025 | Q3 | 697 | -13 | +0.2% |
| 2025 | Q2 | 696 | +0 | +1.3% |
| 2025 | Q1 | 706 | +25 | +3.5% |
| 2024 | Q4 | 693 | +19 | +3.5% |
| 2024 | Q3 | 710 | +27 | +3.0% |
| 2024 | Q2 | 696 | +3 | +2.5% |
| 2024 | Q1 | 681 | -16 | +0.4% |
| 2023 | Q4 | 674 | -12 | -1.4% |
| 2023 | Q3 | 683 | +3 | -1.4% |
| 2023 | Q2 | 693 | +6 | -2.8% |
See O'Neill & Brennan's complete headcount history, including quarterly breakdowns.
Get the DataO'Neill & Brennan Employee Count by Region (2026)
Northern Europe accounts for the largest share of O'Neill & Brennan's global workforce with approximately 95% of total employees, followed by Western Europe and Sub-Saharan Africa.
O'Neill & Brennan employees by region
| Region | Employees | % of Total |
|---|---|---|
| Northern Europe | 646 | 94.6% |
| Western Europe | 6 | 0.9% |
| Sub-Saharan Africa | 6 | 0.8% |
| South Asia | 6 | 0.8% |
| Central America and the Caribbean | 5 | 0.7% |
| Eastern Europe | 4 | 0.6% |
| North America | 3 | 0.5% |
| Central and Western Asia | 2 | 0.3% |
| South America | 2 | 0.2% |
| Southern Europe | 2 | 0.2% |
Drill into city-level data, hiring trends by region, and historic geographic shifts.
Unlock Geographic DataO'Neill & Brennan Employee Count by Department (2026)
O'Neill & Brennan's employee groups are Sales and Marketing (40.6%), Finance and Operations (37.3%), and Engineering (22.1%).
O'Neill & Brennan employees by department
| Department | Employees | % of Total |
|---|---|---|
| Sales and Marketing | 273 | 40.6% |
| Finance and Operations | 251 | 37.3% |
| Engineering | 149 | 22.1% |
Compare O'Neill & Brennan's department mix to industry peers.
See Full DataO'Neill & Brennan Employee Salary by Region (2026)
O'Neill & Brennan's average employee salary is $51,862 globally. Employees in Western Europe receive the highest compensation. Pay is lowest in South Asia, at a median of $4,000.
O'Neill & Brennan median employee salary by region (USD)
| Region | Median Salary |
|---|---|
| Western Europe | $51,000 |
| Northern Europe | $44,000 |
| Eastern Europe | $31,000 |
| Central America and the Caribbean | $21,000 |
| Sub-Saharan Africa | $15,000 |
| South Asia | $4,000 |
Unlock salary by role, level, and city — and compare to O'Neill & Brennan's industry peers.
Unlock Salary DataO'Neill & Brennan Job Openings and Hiring Trends (2023-2026)
- O'Neill & Brennan had 487 active job postings in 2026, a 146.0% increase (+108) from 2025.
- O'Neill & Brennan had 379 active job postings in 2025, a 111.3% increase (+271) from 2024.
- O'Neill & Brennan had 108 active job postings in 2024, a 145.6% increase (+91) from 2023.
- O'Neill & Brennan had 17 active job postings in 2023, a 121.8% decline from 2022.
- Hiring velocity in 2026: 258 new roles/month, up from 247 in 2025 and 145 in 2024.
O'Neill & Brennan's hiring is accelerating: active job postings rose 146.0% in 2026 to 487, with new postings per month climbing from 27 in 2023 to 258 in 2026.
Track new postings per month, role-level demand, and hiring velocity vs. peers.
Unlock Hiring DataO'Neill & Brennan Employee Sentiment (2026)
Revelio Labs tracks employee sentiment across O'Neill & Brennan's workforce based on public professional data. Overall sentiment is positive and has held steady 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 O'Neill & Brennan
- How fast is O'Neill & Brennan growing?
- In 2026, O'Neill & Brennan's headcount shrank 1.3% to 686 employees, down from 706 in 2025.
- See the full headcount history
- Where are O'Neill & Brennan employees located?
- Most O'Neill & Brennan employees are based in Northern Europe (94.6% of headcount), followed by Western Europe and Sub-Saharan Africa.
- Explore where the workforce is based
- What is the average salary at O'Neill & Brennan?
- The average employee salary at O'Neill & Brennan is approximately $51.9k per year.
- Analyze the salary distribution
- How many new job postings does O'Neill & Brennan open per year?
- In Q1 2026, O'Neill & Brennan opened 775 new job postings. In 2025, O'Neill & Brennan opened 2,962 new job postings — about 247 per month.
- Track hiring trends by role
- When was O'Neill & Brennan founded and where is it headquartered?
- O'Neill & Brennan was founded in 1990 and is headquartered in London, United Kingdom.
- Compare O'Neill & Brennan to industry peers
Speak with a workforce expert about O'Neill & Brennan.
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