| Rentree AI Ltd | Information & communication | 2025 |
| Repowise Ltd | Information & communication | 2024 |
| Residential Property Services London Limited | Construction | 2024 |
| Residential Refurbishments Essex Ltd | Construction | 2024 |
| Resilience Management Solutions Ltd | Administrative & support | 2016 |
| Resolution Creative Media Limited | Professional & scientific | 2007 |
| Resolve Property Solutions Ltd | Construction | 2023 |
| Retail and Fragrance Consulting Limited | Administrative & support | 2019 |
| Retrofigure Ltd | Wholesale & retail | 2023 |
| Revamp Consultants Ltd | Professional & scientific | 2025 |
| Revell Barbers Limited | Other services | 2006 |
| Revilo Recruitment Limited | Administrative & support | 2017 |
| Revolec Ltd | Construction | 2022 |
| Reynolds & Stein Company Ltd. | Financial services | 2018 |
| RF Cooling Solutions Ltd | Construction | 2026 |
| RGJ Electrical Ltd | Construction | 2020 |
| Rhino SP Limited | Manufacturing | 2011 |
| RHS Essex Ltd | Construction | 2014 |
| Rial Corporate Ltd | Information & communication | 2014 |
| Ribow Properties Limited | Administrative & support | 1998 |
| Ricay Limited | Hospitality | 2025 |
| Ricey Rigging Services Ltd | Arts & recreation | 2022 |
| Rich Intellect Limited | Information & communication | 2004 |
| Richard Bayliss Limited | Extraterritorial | 2015 |
| Richardson Hosken Insurance Services Limited | Extraterritorial | 2001 |
| Richswanderwheels Limited | Education | 2026 |
| Ridgeon West Productions Ltd | Arts & recreation | 2025 |
| Ridgers & Co Ltd | Real estate | 2025 |
| Ridgeway Mechanical Services Ltd | Manufacturing | 2011 |
| RIG Marole International Limited | Agriculture & fishing | 2019 |
| Right Process Ltd | Professional & scientific | 2022 |
| Rightway Properties Ltd | Real estate | 2019 |
| River and Rural Limited | Agriculture & fishing | 2020 |
| Rivers Investments Limited | Real estate | 2017 |
| Rivers Property Design Ltd | Construction | 2023 |
| RJ Goulding Services Ltd | Professional & scientific | 2015 |
| Rjac Ltd | Administrative & support | 2018 |
| RJB Construction (U.K) Limited | Construction | 2007 |
| RJC Automation Ltd | Manufacturing | 2024 |
| RJG Mechanical Ltd | Construction | 2023 |
| RJT Data Communications Limited | Information & communication | 2013 |
| RJW Coaching Limited | Arts & recreation | 2019 |
| RK Financial Ltd | Construction | 2015 |
| RK HV Power Services Limited | Construction | 2022 |
| RK Jarvis and Sons (Investments) Limited | Real estate | 2025 |
| RK Jarvis and Sons Limited | Administrative & support | 2022 |
| RL Southern Ltd | Administrative & support | 2019 |
| RL Wealth Management Limited | Financial services | 2016 |
| RM Brickwork UK Limited | Construction | 2006 |
| RM Roofing & Building Limited | Construction | 2015 |
| RMB Electrical & Testing Ltd | Construction | 2011 |
| RMC Design Solutions Limited | Professional & scientific | 2020 |
| RMD Carpentry & Construction Ltd | Manufacturing | 2021 |
| RMO Family Enterprises Ltd | Hospitality | 2025 |
| RMO Operations Ltd | Professional & scientific | 2019 |
| RMW Plumbing & Heating Limited | Other services | 2014 |
| Roadway Express Rentals Limited | Administrative & support | 2026 |
| Roar Management Ltd | Arts & recreation | 2024 |
| Roatan Consulting Limited | Financial services | 2010 |
| Robert Clark Security Limited | Administrative & support | 2012 |
| Roberts & Roberts Physiotherapy Limited | Health & social care | 2014 |
| Robin Langton Consulting Services Limited | Professional & scientific | 2016 |
| Robs Room Outside Limited | Administrative & support | 2017 |
| Rock Investment Research Limited | Extraterritorial | 2012 |
| Rockingham Consulting Ltd | Professional & scientific | 2016 |
| Roco Services Ltd | Construction | 2015 |
| Roeks Avenue Limited | Administrative & support | 2024 |
| Rofi Investments Limited | Real estate | 2026 |
| ROI Advertising Ltd | Administrative & support | 2010 |
| Roman Flowers Ltd | Wholesale & retail | 2019 |
| Romford Tipster Ltd | Other services | 2021 |
| Ronald & Co Realty Ltd | Real estate | 2024 |
| Roomailcapital Ltd | Hospitality | 2019 |
| Rooms by IVY Ltd | Construction | 2021 |
| Roost Productions Limited | Other services | 2009 |
| Rose Cottage Podiatry & Chiropody Ltd | Health & social care | 2024 |
| Rosemary Law Ltd | Professional & scientific | 2026 |
| Rosemont Developments Limited | Construction | 2011 |
| Rosendale Investments Limited | Financial services | 2013 |
| Rosies H&B Ltd | Other services | 2020 |
| Ross Construction Services Limited | Construction | 2015 |
| Rothwell Telecoms Ltd | Information & communication | 2018 |
| Round One Fitness Limited | Arts & recreation | 2023 |
| Route One Media Limited | Professional & scientific | 2021 |
| Routeone Risk Services Limited | Administrative & support | 2026 |
| Roving Radar Ltd | Administrative & support | 2006 |
| ROX Aesthetics & Laser Ltd | Other services | 2025 |
| Roxie's Mot's N More Ltd | Wholesale & retail | 2017 |
| Roxwell Contracting Limited | Construction | 2016 |
| Royal Mews Dental Practice Limited | Health & social care | 2012 |
| Royalla Ltd | Arts & recreation | 2023 |
| RP Skin Solutions Limited | Other services | 2023 |
| RPJ Automotive Limited | Professional & scientific | 2011 |
| Rrnest Limited | Extraterritorial | 2019 |
| RS Podiatry Limited | Health & social care | 2018 |
| RSC Data Ltd | Information & communication | 2021 |
| RSC Electrical Contractors Limited | Construction | 2006 |
| RSC Scaffolding Ltd | Construction | 2011 |
| RSD Counselling Services Limited | Other services | 2003 |
| RT BUS Trimmers Limited | Manufacturing | 2022 |