Insperity is a professional employer organization (PEO) that provides outsourced HR services to small and medium-sized businesses across the U.S. In a PEO arrangement, Insperity becomes a co-employer of its clients' employees, taking on payroll processing, tax filings, benefits administration, workers' compensation, and HR compliance, while the client retains control over day-to-day operations. Insperity's core offering, HR360, bundles these services with access to group health, dental, vision, and 401k benefits, plus Insperity's proprietary HR technology platform. Insperity charges a service fee equal to client payroll plus a markup, so revenue scales with the number of worksite employees (WSEEs) under management and the revenue earned per WSEE per month. Profitability is primarily driven by the spread between pricing and direct costs — mainly health insurance claims, workers' compensation, and payroll taxes. As the plan sponsor of its health insurance programs through UnitedHealthcare, Insperity bears direct exposure to healthcare claims inflation, which drove a significant earnings shortfall in 2025. Insperity sells through a direct field sales force and had approximately 312,000 WSEEs across 44 markets as of year-end 2025. A key growth initiative is HRScale, a joint product developed with Workday that combines Insperity's HR services with Workday's HCM technology, targeting mid-market companies with 150–5,000 employees. Insperity invested approximately $150M to build HRScale and expects the first clients to go live in Q1 2026.