ADP vs SO Comparison

Automatic Data Processing, or ADP, is a global, cloud-based human capital management provider offering payroll, compliance, talent management, benefits administration, and retirement services. The firm also provides HR outsourcing services, including PEO offerings, enabling clients to reduce HR overhead. Its broad suite serves customers of all sizes across diverse sectors, and the firm holds large market shares in its core markets. As of fiscal 2025, ADP counts over 1.1 million clients and manages payroll for more than 42 million workers across 140 countries.

Southern is one of the largest utilities in the US. The company serves 9 million customers with vertically integrated electric utilities in three states and natural gas distribution utilities in four states. It owns 46 gigawatts of rate-regulated generating capacity, primarily for serving customers in Georgia, Alabama, and Mississippi. Subsidiary Southern Power owns 13 gigawatts of natural gas generation and renewable energy across the US and sells the electricity primarily under long-term contracts.