How many employees work at O'Halloran & O'Brien?
O'Halloran & O'Brien Ltd. has 433 employees, according to Revelio Labs workforce intelligence data. The YoY growth rate is -14.8%.
Data source: Revelio Labs Coverage: Global workforce Latest update: December 2025
About O'Halloran & O'Brien
O'Halloran & O'Brien Ltd. was incorporated in 1972. It is now in the sole ownership of Tom O'Brien. The company has evolved from a small groundworks company to a multi disciplined major contractor, encompassing the full spectrum of Civil Engineering and ground remediation. Over the past ten years, the inhouse planthire department was set up as a separate company, B&T Plant Hire Ltd.- www.bandtplanthire.co.uk The company now incorporates a Reinforced Concrete Frame division. This sector of the company, from small beginings in 1997, accounted for nearly 50% of the turnover in 2004.
As of December 2025
O'Halloran & O'Brien
workforce metrics
Headcount
433
Avg. Salary
$65.1k
Tenure
4.9yr
Growth Rate
-14.8%
Hiring Rate
Attrition Rate
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Employee Headcount
Interactive chart of O'Halloran & O'Brien annual worldwide employee count from 2023 to 2025.
- O'Halloran & O'Brien total number of employees in 2025 was 433, a 14.8% decline from 2024.
- O'Halloran & O'Brien total number of employees in 2024 was 503, a 1.1% increase from 2023.
- O'Halloran & O'Brien total number of employees in 2023 was 497, a 2.6% increase from 2022.
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Employee Geographic Breakdown
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Active Job Postings
Interactive chart of O'Halloran & O'Brien annual active job postings from 2023 to 2025.
- O'Halloran & O'Brien active job postings in 2025 was 7, a 35.3% decline from 2024.
- O'Halloran & O'Brien active job postings in 2024 was 10, a 66.7% decline from 2023.
- O'Halloran & O'Brien active job postings in 2023 was 20, a 163.6% increase from 2022.
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Employee Sentiment
Sentiment Topics
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