Learn how businesses are using the power of professional employer organizations to improve productivity and profitability. Infographic by SOI a leading professional employer organization (PEO) for small and medium-sized businesses (SMBs) serving as a trusted partner in integrated human resource (HR) compliance, risk management, employee benefits, employment practices liability insurance (EPLI), and payroll processing. SOI is based in Charlotte, NC and supports tens of thousands of worksite employees throughout the U.S.