ADP

ADP is one of the world's largest providers of human capital management (HCM) solutions, serving over 1 million clients across 140 countries. Their comprehensive platform covers payroll processing, tax compliance, benefits administration, time and attendance, talent management, and HR compliance. ADP's DataCloud provides workforce analytics and benchmarking powered by anonymized data from 30+ million employees. Their compliance engine automatically tracks federal, state, and local labor law changes across all US jurisdictions, including pay transparency requirements, wage and hour rules, and employment tax updates. ADP TotalSource offers a full PEO solution for small and mid-size businesses needing complete HR outsourcing with built-in compliance.

Pricing varies by company size and modules. RUN (1-49 employees) starts ~$79/mo + $4/employee. Workforce Now (50-999) is custom. Enterprise (1000+) is custom.