| REM Association CIC | Other services | 2023 |
| Remit Consulting Limited Liability Partnership | | 2005 |
| REMOTE365 Ltd | Information & communication | 2018 |
| REN Express Limited | Wholesale & retail | 2011 |
| Renasucr Ltd | Other services | 2024 |
| Rendle Intelligence and Insights Limited | Information & communication | 2023 |
| Renovex Built Ltd | Construction | 2025 |
| Rent for Less Ltd | Construction | 2018 |
| Rental Ventures Ltd | Real estate | 2026 |
| Rentfix Ltd | Real estate | 2017 |
| Renuka Management Limited | Transport & logistics | 2020 |
| Resin 4 YOU Ltd | Wholesale & retail | 2020 |
| Resistance RA Ltd | Arts & recreation | 2016 |
| Resiva Technologies Ltd | Information & communication | 2025 |
| Resolute Fire Suppression Limited | Administrative & support | 2015 |
| Resolute Inns Limited | Hospitality | 2019 |
| Resolute Moore Holdings Limited | Real estate | 2026 |
| Respotel Limited | Professional & scientific | 1992 |
| Restall-Harrison Limited | Real estate | 2022 |
| Restoration Revival Fellowship Harrow | Other services | 2009 |
| Retro Show Ltd | Wholesale & retail | 2026 |
| Reva Oak Properties Limited | Real estate | 2023 |
| Revenue Growth Limited | Administrative & support | 2022 |
| Revival Decorative Mouldings Limited | Manufacturing | 2006 |
| Revive FIX Ltd | Administrative & support | 2025 |
| Revolo Consultancy International Limited | Professional & scientific | 2020 |
| Revolution Tax Services Limited | Professional & scientific | 2020 |
| Reward Healthcare Ltd | Health & social care | 2023 |
| Rewrite & Dream Limited | Wholesale & retail | 2023 |
| Rezzer Limited | Wholesale & retail | 2024 |
| RF Halal Butchers Ltd | Wholesale & retail | 2024 |
| RGP Trans Ltd | Transport & logistics | 2014 |
| RH Partners Ltd | Administrative & support | 2025 |
| Rhinestone Cowboy Limited | Information & communication | 2020 |
| Rhinolux Ltd | Manufacturing | 2022 |
| Rhodaf Limited | Health & social care | 2017 |
| Rhubarb Plus Limited | Information & communication | 2017 |
| RIA Holdco Ltd | Financial services | 2025 |
| Richard Medical Carers Limited | Health & social care | 2022 |
| Richard Shillingford Solutions Ltd | Transport & logistics | 2019 |
| Rick W. Productions Limited | Information & communication | 1999 |
| Rico Telecoms Limited | Administrative & support | 2014 |
| Riddance Environmental UK Limited | Administrative & support | 2015 |
| Ridgehurst Carpentry Ltd | Construction | 2025 |
| Ridjazz Logistics Ltd | Transport & logistics | 2026 |
| Ridley Services Ltd | Administrative & support | 2018 |
| Ridouts GAS Services Limited | Construction | 2007 |
| Right Carpet & Flooring Ltd | Wholesale & retail | 2020 |
| Right Flooring MK Limited | Wholesale & retail | 2018 |
| Rightray Driving School Ltd | Education | 2026 |
| RIH Transport Services Limited | Transport & logistics | 2025 |
| Rippleway Limited | Hospitality | 2025 |
| Risaan Insiya Limited | Real estate | 2021 |
| Rise & Shine Rentals and Taxi Service Ltd | Transport & logistics | 2025 |
| Risedale Construction Limited | Construction | 2016 |
| Rising Star Cleaning Services Ltd | Administrative & support | 2014 |
| River Direct Limited | Hospitality | 2025 |
| Riverchoice Limited | Hospitality | 2025 |
| Rivet Engineering Limited | Professional & scientific | 2024 |
| Rizq Accounting Ltd | Professional & scientific | 2025 |
| Riztech Construction Limited | Construction | 2012 |
| RK Removals Limited | Transport & logistics | 2026 |
| RK UK Joinery Ltd | Construction | 2013 |
| Rk(Uk) Consultants Limited | Health & social care | 2024 |
| Rkay Homes Ltd | Real estate | 2022 |
| Rkay Recruitment Ltd | Administrative & support | 2021 |
| RKR Revenue Limited | Real estate | 2025 |
| RLE Construction Paving Ltd | Construction | 2023 |
| RM Grand Builders Limited | Construction | 2019 |
| Rmag Construction Ltd | Construction | 2024 |
| RMM Consultants Limited | Professional & scientific | 2019 |
| RMY Consultancy Services Limited | Other services | 2014 |
| RMZ Corp Ltd | Wholesale & retail | 2024 |
| ROB Fire Sprinklers Ltd | Construction | 2024 |
| ROB Willson Limited | Health & social care | 2008 |
| Robert Grochola Transport Limited | Transport & logistics | 2018 |
| Robert Taylor Painting & Decorating Ltd | Construction | 2018 |
| Robertson Business Consultancy Ltd | Professional & scientific | 2021 |
| Robinsons Estate Agents Limited | Real estate | 2005 |
| Robinsons Lettings Limited | Real estate | 2007 |
| Robion Global Limited | Administrative & support | 2020 |
| Roboworx Ltd | Information & communication | 2026 |
| ROC Plumbing & GAS Services Limited | Construction | 2023 |
| Rock and Roll Recipe Limited | Hospitality | 2013 |
| Rock Botanical Limited | Extraterritorial | 2025 |
| Rock IT Support Ltd | Other services | 2022 |
| Rocketship Digital Limited | Professional & scientific | 2009 |
| Rockhouse Chester Limited | Health & social care | 2011 |
| Rockingham Barbers Ltd | Other services | 2019 |
| Rodrigues Real Estate Ltd | Real estate | 2024 |
| Roefield Capital Limited | Real estate | 2018 |
| Roffey Care Limited | Administrative & support | 2015 |
| Rokas Tech Ltd | Administrative & support | 2016 |
| Rolldecor Services Ltd | Construction | 2025 |
| Roman Krish Ltd | Wholesale & retail | 2025 |
| Roman RS Construction Ltd | Construction | 2013 |
| Romtip Trans Ltd | Administrative & support | 2019 |
| RON Construction Limited | Construction | 2010 |
| RON Developers Limited | Construction | 2016 |
| Rondas Exports Ltd | Wholesale & retail | 2022 |