systemone.com
System One provides specialized, highly technical staffing, outsourced services and workforce solutions. Its customers are large private and public organizations in critical infrastructure, technology, life sciences and government. It was formed in 2008 through a management buyout from Hudson Highland Group. Its own site cites about $1.5B in revenue from 60 locations across the US, UK and Canada, while ZoomInfo estimates $4.2B. It is private-equity backed, and in September 2026 it received an undisclosed investment from Oaktree Capital Management and StepStone Group. It is not an AI company.
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