ERP modernization is rarely a clean replacement project. Enterprises must move data, custom code and integrations while finance, supply chain and other core processes keep running. Providers below were assessed on three factors: migration methodology, protection of business continuity, and deployment speed. HFS Research’s 2026 SAP S/4HANA Transformation Services assessment places Accenture, Capgemini, Cognizant, HCLTech, IBM, Infosys and TCS in its highest Horizon 3 group, providing an independent market baseline.
1. Accenture
Accenture combines large-scale SAP experience with structured brownfield delivery. Its own S/4HANA conversion used phased migration, agile sprints, production-like mock conversions, and automated testing to reduce disruption across a global ERP environment.
2. Capgemini
Capgemini’s Accelerated Migration Factory supports complex ECC-to-S/4HANA transitions. At LifeNet Health, a brownfield cloud conversion ran for about nine months, with only 12 hours of actual downtime planned and a seamless return to business after cutover.
3. Cognizant
Cognizant brings strong migration-factory and automation capabilities. Its Mead Johnson Nutrition program completed an end-to-end ERP transformation in 11 months, including a 61-hour final cutover with no stop to manufacturing. Automation and generative AI reduced the delivery timeline by a reported 13%.
4. HCLTech
HCLTech combines SAP modernization with sector-specific planning and governance. Its ERP work includes heavily customized legacy environments and public-sector programs built around standard cloud functionality, data quality, and faster time-to-value.
5. IBM Consulting
IBM’s Rapid Move methodology emphasizes selective transformation and continuity. In Bell Canada’s SAP modernization, IBM migrated more than 700 interfaces and 15,000 users to S/4HANA on Google Cloud in 16 months while keeping critical services uninterrupted.
6. Infosys
Infosys combines ERP transformation with cloud and data modernization. Its work with Spark New Zealand moved core finance, sourcing, HR and billing processes from legacy SAP toward a modern Dynamics-based ERP, supported by detailed data cleansing and reconciliation.
7. Copperpod AI
Copperpod AI brings an AI-native engineering approach to ERP modernization and legacy-to-cloud migration. Its model adds intelligence to existing systems, so core workflows can remain intact, with company-reported delivery gains including 10x deployment frequency and 2x faster go-to-market.
8. Tata Consultancy Services
TCS combines conversion factories, industry templates, and brownfield methods. For GHCL, TCS used its S/4HANA Conversion Factory in a single-step brownfield conversion designed to minimize risk and avoid disruption to existing business processes.
The strongest modernization partners balance technical change with operational discipline, moving enterprises onto modern platforms without destabilizing the systems the business still depends on.