| Road & Air Vehicle Sales Limited | Wholesale & retail | 2015 |
| Road Collision Support Network Ltd | Administrative & support | 2025 |
| Road to Independence Ltd | Health & social care | 2015 |
| Roamy Limited | Real estate | 2025 |
| ROB Broomhead Ltd | Health & social care | 2016 |
| ROB Webb Vehicle Consulting Limited | Administrative & support | 2014 |
| Robella Ltd | Real estate | 2008 |
| Robert Adams Accountancy Limited | Professional & scientific | 2024 |
| Robert Craig Promotions Ltd | Arts & recreation | 2026 |
| Robert Durrant Limited | Agriculture & fishing | 2012 |
| Robert J. Dutton Limited | Construction | 1965 |
| Robert Peel House Management Company Limited | Households | 2023 |
| Roberta Wright Dental Hygienist Ltd | Health & social care | 2025 |
| Robey-Pott Consulting Ltd | Professional & scientific | 2019 |
| Robin Holdings Limited | Real estate | 2021 |
| Robina Cawston Ltd | Professional & scientific | 2017 |
| Robinson Landscapes Limited | Administrative & support | 2026 |
| Robinson Young Holdings Limited | Professional & scientific | 2008 |
| Robot Lights Limited | Arts & recreation | 2016 |
| Robotic Node Ltd | Information & communication | 2024 |
| Robson & Co. Properties Ltd | Construction | 2025 |
| Robtech Ltd | Construction | 2022 |
| Roburwave Digital Ltd | Information & communication | 2026 |
| Roby Invest Ltd | Real estate | 2025 |
| Rock Crest Ltd | Professional & scientific | 2025 |
| Rockedge Ventures Limited | Manufacturing | 2020 |
| Rocketflow Solutions Ltd | Education | 2025 |
| Rocketsys Ltd | Financial services | 2024 |
| Rockhopper Properties Ltd | Real estate | 2019 |
| Rockwood Pharma Ltd | Professional & scientific | 2019 |
| Roderpath Ltd | Wholesale & retail | 2025 |
| Rodwell James Accountancy Limited | Professional & scientific | 2021 |
| Rodycloud Consulting Ltd | Professional & scientific | 2024 |
| Roger Morris Industrial Ltd | Professional & scientific | 2026 |
| Rohi Estates Ltd | Real estate | 2017 |
| Roisoftstudio Ltd | Information & communication | 2026 |
| Rokalin Technologies Ltd | Professional & scientific | 2025 |
| Rolchi Global Ltd | Manufacturing | 2024 |
| Rolfes of Walsham Limited | Wholesale & retail | 2010 |
| Rolling Film Festival Ltd | Information & communication | 2024 |
| Rollover Royce Company Limited | Health & social care | 2016 |
| Rolls Plastics Ltd | Manufacturing | 2005 |
| Rollstart Ltd | Arts & recreation | 2025 |
| Roman Mosaic Workshops Ltd | Other services | 2020 |
| Romans Health Ltd | Manufacturing | 2026 |
| Romark Properties Limited | Real estate | 2002 |
| Romenda Ltd | Wholesale & retail | 2025 |
| Romlynn Consulting Limited | Construction | 2025 |
| Rommel Software Ltd | Information & communication | 2025 |
| Romosa Limited | Wholesale & retail | 2025 |
| Romz Ltd | Construction | 2024 |
| Roni Enterprise Ltd | Hospitality | 2025 |
| Roofblock Limited | Construction | 2006 |
| Roon Commercial Ltd | Professional & scientific | 2026 |
| Roots & Spice Collective Ltd | Wholesale & retail | 2025 |
| Roots-Rout Holdings Ltd | Construction | 2016 |
| Ropewalks Management Limited | Real estate | 2021 |
| Ropott Limited | Real estate | 2018 |
| Rosard Parfum Ltd | Manufacturing | 2024 |
| Rose Forge Farriers Ltd | Professional & scientific | 2025 |
| Rose Freight Logistics Limited | Transport & logistics | 2023 |
| Rose Gems Healing Crystals Ltd | Wholesale & retail | 2022 |
| Rose Petals Group Limited | Manufacturing | 2020 |
| Rose Terrace Management (Diss) Limited | Construction | 2007 |
| Roseberry Finance Limited | Real estate | 1951 |
| Rosebud Creative Ltd | Arts & recreation | 2018 |
| Rosegray Ltd | Professional & scientific | 2021 |
| Rosemont Apartments Limited | Real estate | 2000 |
| Rosha Properties Limited | Real estate | 2024 |
| Roshdy Guirguis Radiology Limited | Health & social care | 2011 |
| Rosie's Bury ST Edmunds Limited | Hospitality | 2025 |
| Ross Watson Chiropractic Limited | Health & social care | 2015 |
| Rotobop Limited | Other services | 2016 |
| Rotorworkx Limited | Wholesale & retail | 2026 |
| Rougham Industrial Traders Association Limited | Construction | 1990 |
| Route Health Ltd | Wholesale & retail | 2025 |
| Routes to Nutrition Limited | Health & social care | 2022 |
| Routetalent Limited | Administrative & support | 2026 |
| Rowan Gershom Orford Ltd | Construction | 2021 |
| Rowdy Productions Limited | Information & communication | 2008 |
| Roxxy Ltd | Information & communication | 2025 |
| Roxy Investments Limited | Financial services | 2022 |
| Roxy Roo's Candles Ltd | Wholesale & retail | 2025 |
| Royale Equine Livery Limited | Agriculture & fishing | 2020 |
| Royale Karmen Ltd | Manufacturing | 2025 |
| Royale West Football Club Limited | Arts & recreation | 2025 |
| Royle Costumes Ltd | Wholesale & retail | 2022 |
| Rozen.Mint Consulting Ltd | Professional & scientific | 2025 |
| Rozmanaria Ltd | Information & communication | 2010 |
| RP Sports Analytics Limited | Arts & recreation | 2025 |
| RPC Groundworks Ltd | Construction | 2022 |
| Rphl Ltd | Wholesale & retail | 2026 |
| RR Legal Ltd | Professional & scientific | 2025 |
| RR Personal Training Ltd | Extraterritorial | 2023 |
| RRB Consulting Limited | Professional & scientific | 2023 |
| RRC Distribution Limited | Wholesale & retail | 2025 |
| Rrowm Ltd | Wholesale & retail | 2026 |
| RRT Holding Limited | Professional & scientific | 2024 |
| RS & Co Property Staging Ltd | Real estate | 2025 |
| RS Advisory Services (Global) Limited | Professional & scientific | 2025 |