| Rentalmaster Limited | Administrative & support | 2004 |
| Rentaltec Limited | Administrative & support | 2023 |
| REP Acquisitions Ltd | Real estate | 2025 |
| Reset Technologies Ltd | Information & communication | 2019 |
| Resolution (GB) Ltd | Manufacturing | 2000 |
| Resolve Wildlife CIC | Professional & scientific | 2025 |
| Resource IT Limited | Professional & scientific | 2003 |
| Resourceit Consulting Ltd | Professional & scientific | 2004 |
| Resourcing Consultancy Ltd | Administrative & support | 2020 |
| Responsiv Media Limited | Wholesale & retail | 2014 |
| Resq Autos Ltd | Wholesale & retail | 2025 |
| Resurrection Video Limited | Information & communication | 2016 |
| Retail & Financial Services Limited | Information & communication | 2013 |
| Retail Bank Consulting Group LLP | | 2008 |
| Retail Financial Consulting Limited | Professional & scientific | 2019 |
| Retro Construction and Management Ltd | Construction | 2026 |
| Retro Motors Limited | Extraterritorial | 2006 |
| Reuben Property Holdings Limited | Real estate | 2016 |
| Reveal and Heal Ltd | Health & social care | 2022 |
| Review Display Systems Limited | Manufacturing | 1982 |
| Reviewed Ltd | Professional & scientific | 2022 |
| Revive and Thrive Events Ltd | Administrative & support | 2023 |
| Revive Marketing & PR Ltd | Professional & scientific | 2022 |
| Revolution HR Limited | Administrative & support | 2025 |
| Revolution Vehicles Limited | Wholesale & retail | 2013 |
| Revu Moto Ltd | Wholesale & retail | 2024 |
| Rezlo Ltd | Administrative & support | 2022 |
| RF Powerworks Ltd | Construction | 2026 |
| Rfrkt Capital Ltd | Wholesale & retail | 2026 |
| RG Financial Services Limited | Financial services | 2021 |
| RG Racing Limited | Wholesale & retail | 2015 |
| RGM Estates Limited | Real estate | 2025 |
| RGM Signature Homes Limited | Construction | 2025 |
| RGU Adventures Limited | Financial services | 2015 |
| RH Interim Solutions Ltd | Professional & scientific | 2018 |
| Rhinevalley Consulting Ltd | Other services | 2013 |
| Ri-Ai Collective Ltd | Information & communication | 2025 |
| RIA Alema Ltd | Administrative & support | 2016 |
| Ribbon Group Ltd | Financial services | 2025 |
| Ribbon Projects Ltd | Professional & scientific | 2014 |
| Richa Skin Limited | Health & social care | 2020 |
| Richard Court Consulting Limited | Professional & scientific | 2016 |
| Richard James Smith Limited | Real estate | 2016 |
| Richi-Trans Limited | Transport & logistics | 2018 |
| Richman Entertainment Ltd | Arts & recreation | 2024 |
| Rickety House Ltd | Construction | 2011 |
| Ridern Homes Limited | Construction | 2025 |
| Ridgebourne Property Ltd | Real estate | 2022 |
| Ridgers Management Ltd | Professional & scientific | 2024 |
| Ridgeway Technologies Limited | Information & communication | 2016 |
| Ridtek Ltd | Administrative & support | 2013 |
| Right Price Cars Limited | Wholesale & retail | 2002 |
| Right Property Choice Limited | Real estate | 2022 |
| Rightcue Consulting Services Ltd | Information & communication | 2009 |
| Rightcue Limited | Information & communication | 2018 |
| Rightroute Advocacy Limited | Information & communication | 2025 |
| Rihaan Infotech Ltd | Information & communication | 2017 |
| Riley Installations Limited | Construction | 2008 |
| Rimell Saddlers Limited | Manufacturing | 2002 |
| Ringgo Limited | Information & communication | 1996 |
| Rinokya Consultants Ltd | Administrative & support | 2025 |
| Ripton Windows Limited | Wholesale & retail | 1996 |
| Rise Construction & Facilities Management Ltd | Construction | 2026 |
| Rising Star Healthcare Ltd | Health & social care | 2022 |
| Risk Assessments Wirral Ltd | Administrative & support | 2023 |
| Risk Management Services (RMS) Limited | Professional & scientific | 2019 |
| Risolv Health Limited | Manufacturing | 2023 |
| Ritas Yoga Limited | Arts & recreation | 2022 |
| River K Solutions Limited | Professional & scientific | 2013 |
| Riverdene Management Company Limited | Households | 1997 |
| Rivermore Asset Finance Ltd | Financial services | 2011 |
| Rivermore Finance Group Ltd | Financial services | 2004 |
| Rivermore Limited | Financial services | 2003 |
| Rivi Networks Limited | Wholesale & retail | 2021 |
| Rjcampers Limited | Administrative & support | 2025 |
| RJH Carpentry Limited | Construction | 2018 |
| Rjinnovatives Ltd | Information & communication | 2017 |
| RJM Energy Solutions Ltd | Construction | 2025 |
| Rkwworkshop Ltd | Arts & recreation | 2022 |
| RL Ventilation Limited | Construction | 2011 |
| RLC Property Services Ltd | Real estate | 2024 |
| RLD Associates Limited | Extraterritorial | 2013 |
| RLL Gaming and Technology Ltd | Wholesale & retail | 2024 |
| RM Design Solutions Limited | Professional & scientific | 2004 |
| RMB Electrical Contractor Limited | Construction | 2014 |
| RMC Property Investments Ltd | Real estate | 2023 |
| RME Sales Ltd | Wholesale & retail | 2025 |
| Rmftc Limited | Professional & scientific | 1992 |
| RMI Digital Consulting Ltd | Information & communication | 2024 |
| RMP Filmmakers Limited | Information & communication | 2013 |
| ROB Goddard Limited | Professional & scientific | 2017 |
| Rob&Bab Ltd | Construction | 2019 |
| Robert Jamieson Limited | Professional & scientific | 2015 |
| Robert Mukasa Limited | Administrative & support | 2017 |
| Roberta Rizzo Ltd | Information & communication | 2021 |
| Robertson & Co UK Ltd | Administrative & support | 2020 |
| Robosen Robotics UK Ltd | Wholesale & retail | 2022 |
| Robosen Technologies Ltd | Wholesale & retail | 2022 |
| Rocket and FOX Marketing Ltd | Professional & scientific | 2019 |
| Rockettest Limited | Extraterritorial | 2021 |