| RB Group Services Ltd | Construction | 2014 |
| RB Hand Car Wash Ltd | Other services | 2025 |
| RBR Trans Ltd | Transport & logistics | 2020 |
| RCJ Transport Ltd | Transport & logistics | 2017 |
| RCS Commercial Property (Waddington) Limited | Real estate | 2020 |
| RCS Commercial Property Ltd | Real estate | 2001 |
| Rcwt Property Limited | Real estate | 2020 |
| RDE Associates Limited | Professional & scientific | 2008 |
| RDL Accountancy Limited | Professional & scientific | 2016 |
| RDL Plumbing & Heating Ltd | Construction | 2024 |
| React Recruitment Group Ltd | Professional & scientific | 2020 |
| Ready Energy and Network Solutions Limited | Energy | 2026 |
| Real English Gift Company Limited | Wholesale & retail | 2004 |
| Recondite Limited | Wholesale & retail | 2024 |
| RECRUIT2CARE 2022 Ltd | Administrative & support | 2022 |
| Recycle IT Wright Ltd | Extraterritorial | 2009 |
| Recycling Ollerton and Boughton | Water & waste | 2002 |
| Red Carter Limited | Hospitality | 2025 |
| Red Dragon Fireworks Limited | Wholesale & retail | 2025 |
| Red Forest Properties Limited | Real estate | 2009 |
| Red Shoe Ents Ltd | Arts & recreation | 2023 |
| Red Square RTM Company Limited | Households | 2012 |
| Red Telecom Limited | Wholesale & retail | 2018 |
| Redbrick Structural Engineers Ltd | Professional & scientific | 2012 |
| Redcad Limited | Manufacturing | 2008 |
| Redders Recycling Ltd | Water & waste | 2025 |
| Redpath Ward Food Engineering Services Limited | Professional & scientific | 2015 |
| Redwood Telecommunications Limited | Extraterritorial | 1991 |
| Reefbridge Limited | Real estate | 1990 |
| Reel Names Ltd | Wholesale & retail | 2022 |
| Reeves Developments Ltd | Real estate | 2021 |
| Reflectclo Limited | Wholesale & retail | 2026 |
| Reflex Gaming Limited | Manufacturing | 2004 |
| Refocus Safety Ltd | Professional & scientific | 2021 |
| Regency Conservatories Limited | Construction | 2005 |
| Regent (Derby) Limited | Professional & scientific | 1999 |
| Rehoboth Medicare Limited | Health & social care | 2023 |
| Reina Glam Ltd | Wholesale & retail | 2025 |
| Reliable Support Group Ltd | Health & social care | 2023 |
| Remis Construction Ltd | Construction | 2015 |
| Remis Homes Ltd | Real estate | 2025 |
| Remote Consulting UK Ltd | Professional & scientific | 2020 |
| Remote Fitness Training Ltd | Health & social care | 2022 |
| Remote Group Ltd | Information & communication | 2015 |
| REN501 Limited | Administrative & support | 2021 |
| Renaissance Eservices Ltd | Education | 2008 |
| Renew and Fortify Ltd | Health & social care | 2023 |
| Renew Laser Clinic Ltd | Other services | 2024 |
| Renovation Franchise UK Limited | Construction | 2016 |
| RENR26R01 Limited | Administrative & support | 2021 |
| Rental Growth UK Ltd | Professional & scientific | 2024 |
| Replay Bidco Limited | Financial services | 2024 |
| Replay Group Limited | Financial services | 2019 |
| Replay Maintenance Limited | Administrative & support | 1979 |
| Replay Midco Limited | Financial services | 2024 |
| Replay Topco Limited | Financial services | 2024 |
| RES Ventures Ltd | Other services | 2019 |
| Rescom Freehouse Ltd | Hospitality | 2019 |
| Resilience and Power Limited | Professional & scientific | 2024 |
| Resin Driveway Nottingham Ltd | Administrative & support | 2025 |
| Resolve Property Trading Ltd | Real estate | 2024 |
| Resolve Rental and Investment Ltd | Real estate | 2024 |
| Responsive Care Group Ltd | Health & social care | 2024 |
| Retford Demolition Ltd | Construction | 2024 |
| Retford Dental Care Limited | Health & social care | 2010 |
| Revolution Wheels International Limited | Wholesale & retail | 2005 |
| Revolutionate Ltd | Information & communication | 2020 |
| Revoluton Limited | Transport & logistics | 2023 |
| Rewind Hire Ltd | Professional & scientific | 2023 |
| Rework Construction Ltd | Manufacturing | 2023 |
| RGA Transport Ltd | Transport & logistics | 2023 |
| RH Tasty Limited | Hospitality | 2023 |
| Rhamry Ltd | Administrative & support | 2016 |
| Rhirhi Aesthetics Ltd | Other services | 2024 |
| RIA Jhala Consulting Ltd | Administrative & support | 2020 |
| Rice at Newark Limited | Hospitality | 2025 |
| Richard Ward Photography Ltd | Professional & scientific | 2020 |
| Richard Watkinson Limited | Real estate | 2010 |
| Richardson Motorsport Holdings Limited | Wholesale & retail | 2017 |
| Richardson Parkin Performance Limited | Wholesale & retail | 2022 |
| Richardson Racing Limited | Wholesale & retail | 2016 |
| Richmond Agencies (UK) Limited | Wholesale & retail | 2006 |
| Richwood Building Consultants Ltd | Professional & scientific | 2024 |
| Ridings Reprographics Limited | Manufacturing | 1983 |
| Ridz Energy Consultants Ltd | Professional & scientific | 2019 |
| Riggott and Company Limited | Other services | 1994 |
| Riggott Holdings Limited | Professional & scientific | 2004 |
| Riggott National Line Marking Limited | Extraterritorial | 2004 |
| Rightway Asset Management Limited | Real estate | 2016 |
| Riley Utility Services Ltd | Construction | 2015 |
| RIO Cabs Newark on Trent Ltd | Other services | 2012 |
| Rise Consultancy Group Limited | Professional & scientific | 2024 |
| Rise Renewables Ltd | Construction | 2025 |
| Ritchie (Heavylift) Limited | Transport & logistics | 2025 |
| Ritchie Services (Holdings) Limited | Financial services | 2025 |
| Ritchie Services (Transport) Limited | Transport & logistics | 2021 |
| Rive Travel Ltd | Administrative & support | 2025 |
| Riverside Drinks Company Limited | Wholesale & retail | 2022 |
| Riversidecottage Ltd | Real estate | 2024 |
| Riverwood Furniture Ltd | Manufacturing | 2022 |