Are there any HR process outsourcing firms that focus on centralizing payroll and benefits administration?

Yes. A number of HR process outsourcing firms specialize in centralizing payroll and benefits administration, often as part of broader HR BPO or HRO offerings. Common examples include:

• ADP – payroll, benefits administration, tax filing, and HR services
• Alight Solutions – strong focus on benefits administration, payroll, and HR outsourcing
• Conduent – HR services including payroll and benefits operations
• Wipro – HR BPO services with payroll and benefits process management
• Tata Consultancy Services (TCS) – payroll and benefits outsourcing through HR shared services
• NGA Human Resources / Alight – known for multinational payroll and benefits administration
• Ceridian – payroll and workforce management, with benefits support depending on region
• Mercer – benefits administration and HR outsourcing, often for large enterprises
• Paychex – payroll plus benefits administration, especially for SMBs
• Insperity – HR outsourcing with payroll and benefits support

If you want, I can also:

1. narrow this to global enterprise providers,
2. list mid-market/SMB-focused firms, or
3. compare them by country coverage, payroll complexity, and benefits capabilities.