TriNet Group, Inc. is an American cloud-based professional employer organization for small and medium-sized businesses. TriNet administers payroll and health benefits and advises clients on employment law compliance and risk reduction, acting in some cases as an outsourced human resources department. TriNet is headquartered in Dublin, California. TriNet partners with organizations between 3 and 2,500 employees. Founded in 1988, TriNet initially offered basic employee benefits, dental coverage, life and disability insurance and employment law guidance. Since then, TriNet has broadened its offerings to add payroll services, Fortune-500 benefits, 401 guidance, worker's compensation, liability insurance, and strategic human resources support and services. The company also provides online tools such as web-hosted management portals for a manager and employee self-service. Wikipedia