| Rmdmcc Limited | Hospitality | 2019 |
| RMG UK Holdings Ltd | Real estate | 2025 |
| Rmgx Limited | Professional & scientific | 2018 |
| RMM Fruits Ltd | Manufacturing | 2025 |
| RMN Medico Ltd | Health & social care | 2011 |
| RMN SH Ltd | Health & social care | 2022 |
| Rmoh Ltd | Professional & scientific | 2018 |
| RN Waterside Consultancy Ltd | Professional & scientific | 2023 |
| RN19 Ltd | Other services | 2026 |
| RNM Dismantling Ltd | Wholesale & retail | 2024 |
| RO Conta BMD Ltd | Professional & scientific | 2018 |
| RO Conta Ltd | Professional & scientific | 2021 |
| RO Legal Consulting Limited | Other services | 2018 |
| RO UK Consultancy Ltd | Professional & scientific | 2023 |
| Road Life Health Care Ltd | Health & social care | 2021 |
| Road Runner Properties (SY) Limited | Real estate | 2023 |
| Roadmasterkl Ltd | Transport & logistics | 2024 |
| Roads to Abodes Ltd | Real estate | 2015 |
| Roadside Retail Food Stainforth Ltd | Manufacturing | 2021 |
| Roadway Distribution Ltd | Transport & logistics | 2016 |
| Roadwise Motors Limited | Wholesale & retail | 2025 |
| Robert Brady Limited | Real estate | 1974 |
| Robert Digital Studio (RDS) Ltd | Transport & logistics | 2020 |
| Robinson & Son's Security Ltd | Administrative & support | 2025 |
| Robinson Court Management Company Limited | Professional & scientific | 2001 |
| Robinson Electrical Ltd | Manufacturing | 2014 |
| Robinson Shoes Limited | Wholesale & retail | 2009 |
| Robsal (Durham) Limited | Administrative & support | 2021 |
| Rocafella Leisure Holdings Limited | Arts & recreation | 2019 |
| Roche Valley Films Ltd | Information & communication | 2021 |
| Rock and Rope Adventures Limited | Arts & recreation | 2015 |
| Rockem Music Limited | Wholesale & retail | 2003 |
| Rockhold Property Ltd | Real estate | 2026 |
| Rockingham Geotechnical Services Ltd | Construction | 2020 |
| Rockingham Media Community Interest Company | Information & communication | 2019 |
| Rocky Ridge Campers Ltd | Other services | 2025 |
| Rodaro Limited | Transport & logistics | 2026 |
| Rogue Multi Media Limited | Information & communication | 1996 |
| ROI Marketing Agency Ltd | Professional & scientific | 2023 |
| ROK Wall Ltd | Construction | 2024 |
| Rokk Construction Ltd | Construction | 2024 |
| Rokk Properties Ltd | Real estate | 2024 |
| Rola Driving Ltd | Transport & logistics | 2019 |
| Rolken Crane Hire Ltd | Administrative & support | 2019 |
| Rollem Associates Ltd | Real estate | 2009 |
| Rollem Pears Limited | Professional & scientific | 2016 |
| Rollem Property Limited | Professional & scientific | 2006 |
| Rollin Car Sales Ltd | Wholesale & retail | 2024 |
| Rolljo Developments Ltd | Construction | 2017 |
| Roma 81 Ltd | Wholesale & retail | 2025 |
| Roma Church El-Shaddai Ltd | Other services | 2024 |
| Roma International Mini Market Ltd | Wholesale & retail | 2026 |
| Roma Store Ltd | Wholesale & retail | 2026 |
| Rome Pizza Ltd | Hospitality | 2007 |
| Romo Medical Consultancy Limited | Health & social care | 2015 |
| RON Hull Estates Limited | Real estate | 2018 |
| RON Hull Property Limited | Real estate | 2025 |
| Ronnie Moore Academy Limited | Arts & recreation | 2015 |
| Ronz Motors Ltd | Wholesale & retail | 2018 |
| ROO Hair Limited | Other services | 2026 |
| Roof Maintenance Rotherham Ltd | Construction | 2022 |
| Roof Tech. Ltd | Construction | 2025 |
| Roofdec Limited | Construction | 1972 |
| Roofrescue and Property Maintenance Ltd | Construction | 2025 |
| Roofstore (Yorkshire) Limited | Wholesale & retail | 2006 |
| Root One Advertising Ltd | Professional & scientific | 2017 |
| Roota Engineering Limited | Mining & quarrying | 1973 |
| Ropa Services Limited | Information & communication | 2019 |
| Roper Consulting Limited | Wholesale & retail | 2019 |
| Rorac Holdings Ltd | Financial services | 2025 |
| Rose Box Ltd | Hospitality | 2025 |
| Rose of Sharon Education CIC | Education | 2024 |
| Rose Thistle Developments Ltd | Real estate | 2020 |
| Roshafashion Ltd | Wholesale & retail | 2024 |
| Rossington Community Management Company Limited | Real estate | 2015 |
| Rota Mill (UK) Limited | Manufacturing | 1996 |
| Rother Greek Limited | Hospitality | 2025 |
| Rother Mini Market Limited | Wholesale & retail | 2023 |
| Rother Pine & Oak Furniture Limited | Wholesale & retail | 2008 |
| Rother Removals Ltd | Transport & logistics | 2023 |
| Rother Valley Conveyors Limited | Manufacturing | 2003 |
| Rotherham Amateur Repertory Company Limited(The) | Arts & recreation | 1953 |
| Rotherham and Barnsley Mind | Other services | 1998 |
| Rotherham and District Citizens Advice Bureau | Administrative & support | 2001 |
| Rotherham Autocentre Ltd | Wholesale & retail | 2025 |
| Rotherham Autos & Finance Ltd | Wholesale & retail | 2017 |
| Rotherham Big Discount Store Ltd | Wholesale & retail | 2024 |
| Rotherham Business House Ltd | Professional & scientific | 2026 |
| Rotherham Cancer Care Centre | Health & social care | 2012 |
| Rotherham Car and Van Breakers Ltd | Wholesale & retail | 2013 |
| Rotherham Car Valeting Ltd | Administrative & support | 2026 |
| Rotherham Caravans Limited | Extraterritorial | 2015 |
| Rotherham Carriagemasters Limited | Other services | 2002 |
| Rotherham Catering Ltd | Hospitality | 2025 |
| Rotherham Cheerleading Academy Ltd | Arts & recreation | 2019 |
| Rotherham Crossroads-Caring for Carers | Hospitality | 1997 |
| Rotherham Day CIC | Administrative & support | 2026 |
| Rotherham Education Services Limited | Education | 2013 |
| Rotherham Electrical Services Limited | Construction | 2017 |
| Rotherham Engine Supplies Limited | Manufacturing | 1994 |