PWR vs ADP Comparison

Quanta Services is a leading specialty contractor serving customers across the utility, telecom, oil and gas, and renewable energy markets. The company operates through two segments: electric and underground utility. Through a combination of organic growth and a disciplined acquisition strategy, Quanta has grown into the largest provider of electric transmission and distribution contracting services in the US.

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.