TriNet

TriNet is a professional employer organization (PEO) that provides small and midsize businesses with full-service HR — payroll, access to premium benefits, risk and compliance support, and HR expertise — through a co-employment model. By pooling employees across its client base, TriNet offers access to high-quality, large-group health and other benefits that smaller companies typically can't obtain on their own, while taking on much of the administrative and compliance burden. A distinguishing feature is its industry-tailored approach, with offerings designed for verticals like technology, financial services, nonprofits, life sciences, and professional services.

The platform delivers HR as a managed service plus software. It runs full-service payroll and tax administration; administers medical, dental, vision, 401(k), and other benefits; and provides workers' compensation, risk mitigation, and compliance guidance across states. TriNet pairs this with an HR platform and mobile app for employees and admins, HR consulting and support, and (via its acquisition of Zenefits) additional HR technology. It's aimed at companies that want to offload HR complexity and offer competitive benefits without building a large in-house HR team.

TriNet serves small and midsize businesses, especially in specific industries, wanting comprehensive outsourced HR. Pricing is quote-based (custom per-employee-per-month, PEPM): its administrative fee is commonly estimated around $100–$150 per employee per month (industry ranges cited from roughly $80 to $300+ depending on size, industry, and services), separate from wages, health-insurance premiums, and workers' comp, which are billed additionally. It competes with Justworks, Gusto, ADP TotalSource, and Insperity, differentiating on industry-tailored PEO services and premium benefits.