| RIK Store 11 Ltd | Wholesale & retail | 2026 |
| Riley Bathrooms Limited | Construction | 2025 |
| Riley Estates Ltd | Real estate | 2024 |
| Rinaldi's Restaurant Limited | Hospitality | 2010 |
| Rinkydinky Limited | Information & communication | 2000 |
| Rino Dezines Limited | Manufacturing | 2016 |
| Riovita Ltd | Wholesale & retail | 2015 |
| Riperteritja Ltd | Wholesale & retail | 2021 |
| Rise & Rebuild CIC | Health & social care | 2025 |
| Riskusexport Ltd | Wholesale & retail | 2016 |
| RIU Property Investments Limited | Real estate | 2020 |
| River Premium Finance Ltd | Financial services | 2024 |
| Riverside Groundworks Ltd | Construction | 2024 |
| RJ Analytical Services Limited | Manufacturing | 2024 |
| RJC Law Limited | Financial services | 2008 |
| RJH Electrical Services Ltd | Construction | 2023 |
| RJW Plumbing & Heating Solutions Limited | Construction | 2025 |
| RK Developments & Roofing Ltd | Construction | 2019 |
| RK Immobilien Limited | Professional & scientific | 2007 |
| RKM Healthcare Limited | Health & social care | 2019 |
| RL Car & Commercials Ltd | Wholesale & retail | 2025 |
| RLF Trading Ltd | Wholesale & retail | 2023 |
| RLK Roofing Contractors & Consultants Ltd | Construction | 2026 |
| RLT Marketing Limited | Professional & scientific | 2023 |
| RM Classic Aviation Limited | Transport & logistics | 2024 |
| RM Minibuses Ltd | Transport & logistics | 2026 |
| RMK Distributions Ltd | Wholesale & retail | 2025 |
| RMM Synergy Limited | Health & social care | 2024 |
| RMW Real Estate Ltd | Real estate | 2025 |
| RO Boboc Limited | Transport & logistics | 2022 |
| RO Media Ltd | Information & communication | 2025 |
| Road Runner (Wakefield) Limited | Administrative & support | 2012 |
| Roann Fabrications Limited | Manufacturing | 2015 |
| Roann Limited | Administrative & support | 2010 |
| Roar Buildings & Interiors Ltd | Construction | 2022 |
| ROB Truck Ltd | Transport & logistics | 2019 |
| ROB4T Investments Ltd | Construction | 2021 |
| Robert Smith Site Management Services Ltd | Construction | 2018 |
| Roberts Graphics Limited | Wholesale & retail | 1991 |
| Robinson's Decorating Services Ltd | Construction | 2012 |
| Robinsons Property Solutions Limited | Construction | 2026 |
| Robs Bits&Bobs Ltd | Wholesale & retail | 2025 |
| Robscho Limited | Other services | 2016 |
| Rocco Industries Limited | Real estate | 2017 |
| Rock Options Ltd | Professional & scientific | 2010 |
| Rock Payroll Solutions Limited | Administrative & support | 2014 |
| Rockandroll Daycare Ltd | Health & social care | 2022 |
| Rockpool Global Ltd | Hospitality | 2016 |
| Rockpool Tour Catering Limited | Hospitality | 2012 |
| Rocora Ltd | Wholesale & retail | 2025 |
| Rodeos USA Ltd | Wholesale & retail | 2017 |
| Rodgers Sales Consultancy Limited | Administrative & support | 2021 |
| Rodgerson Family Properties Ltd | Real estate | 2023 |
| ROE Investments Ltd | Financial services | 2017 |
| Roger Albert Clark Rally Motor Club Limited | Arts & recreation | 2009 |
| Roger Hansell Violins Limited | Manufacturing | 2003 |
| Rogue Brand Ltd | Wholesale & retail | 2021 |
| Rogue Studio Digital Ltd | Information & communication | 2022 |
| Roguelife Ltd | Construction | 2025 |
| Rohail Health Care Ltd | Health & social care | 2019 |
| Rohealer Ltd | Health & social care | 2018 |
| ROJ Food Limited | Hospitality | 2022 |
| Rojo Medico Legal Services Limited | Health & social care | 2015 |
| ROK Developments Design and Build Ltd | Real estate | 2004 |
| Rokey Couriers Ltd | Transport & logistics | 2025 |
| Rokzen Limited | Construction | 2013 |
| Romefort Trading Limited | Administrative & support | 2006 |
| Rompen LLP | | 2018 |
| Ronak Holding's Ltd | Hospitality | 2021 |
| Ronald Group Limited | Information & communication | 2026 |
| Roofing & Upvc Specialist Ltd | Construction | 2023 |
| Roofing Division Specialist Ltd | Construction | 2024 |
| Rooftex Ltd | Construction | 2007 |
| Rooks Nest Academy | Education | 2011 |
| Rooms & Views (Home Improvements) Ltd | Construction | 2015 |
| Rooster KNG Ltd | Hospitality | 2022 |
| Rope Ltd | Real estate | 2025 |
| ROS Construction Division Limited | Construction | 2025 |
| ROS Group Limited | Financial services | 2025 |
| Rosala Flowers Ltd | Wholesale & retail | 2024 |
| Rosalie Ryrie Foundation Ltd | Health & social care | 2011 |
| Rosalyn's Medical and Wellbeing Clinic Ltd | Health & social care | 2020 |
| Rose & Thistle Property Limited | Real estate | 2018 |
| Rose Allen Social Work Services Ltd | Public administration | 2016 |
| Rose Products Limited | Extraterritorial | 1982 |
| Rose Referrals Limited | Professional & scientific | 2025 |
| Rosedale Products Europe Limited | Manufacturing | 1998 |
| Roselko Limited | Health & social care | 2019 |
| Rosemoor Properties Limited | Real estate | 2023 |
| Roses&Bliss Limited | Hospitality | 2025 |
| Rosewood Home Care Ltd | Real estate | 2022 |
| Rosewood Ventures Limited | Wholesale & retail | 2004 |
| Roshan's Fast Food Ltd | Hospitality | 2026 |
| Roshan's Pizza Ltd | Hospitality | 2020 |
| Roso Developments Ltd | Construction | 2021 |
| Rosso E Nero Ltd | Hospitality | 2025 |
| Rotajet 2017 Limited | Manufacturing | 2017 |
| Rotajet Holdings Limited | Professional & scientific | 2015 |
| Rotajet Services Limited | Manufacturing | 2017 |
| Rotajet Systems Limited | Manufacturing | 2007 |