Oasis Outsourcing is the nation’s largest privately held Professional Employer Organization, providing Human Resources, Employee Benefits, Payroll and Risk Management services on an outsourced basis. With annual gross revenue close to $9 billion, Oasis Outsourcing is an industry leader. Serving more than 8,000 clients and 260,000 worksite employees throughout the United States, Oasis Outsourcing is a recognized expert in all facets of human resources management.