| Reality Finance LLP | | 2012 |
| Reality Finance Solutions Limited | Administrative & support | 2000 |
| Really Good Builds Ltd | Manufacturing | 2024 |
| Realworld Audio Visual Limited | Administrative & support | 2006 |
| REB Builders Limited | Construction | 2003 |
| Rebuildagram Limited | Information & communication | 2022 |
| Recirco Ltd | Wholesale & retail | 2024 |
| Recruit SO Simple Ltd | Information & communication | 2011 |
| Red (EU) Limited | Manufacturing | 1991 |
| Red Cat Media Ltd | Information & communication | 2016 |
| Red FOX 53 Ltd. | Professional & scientific | 2014 |
| Red Group Solutions Limited | Information & communication | 2009 |
| Red Hawk Developments Ltd | Construction | 2022 |
| Red Kite Planning Limited | Professional & scientific | 2014 |
| Red Mist Property Limited | Real estate | 2014 |
| Red Renovations Ltd | Construction | 2012 |
| Red Squirrel Homes Developments Ltd | Construction | 2025 |
| Red Wheel Solutions Limited | Professional & scientific | 2010 |
| Redberry Financial Limited | Professional & scientific | 2009 |
| Redberry Solutions UK Ltd | Professional & scientific | 2009 |
| Redemption Camp Pierrepont | Hospitality | 2025 |
| Redpender Court Winchester Limited | Households | 2025 |
| Redpender Place Management Company Limited | Households | 2022 |
| Redsails Management Limited | Real estate | 2010 |
| Redstar Telecommunications Ltd. | Information & communication | 2008 |
| Redstone International Ltd | Education | 2021 |
| Redstone IT Limited | Information & communication | 2016 |
| Redwood Cabins Limited | Construction | 2025 |
| Redwood Collective Limited | Arts & recreation | 2013 |
| Redxsecurity Limited | Information & communication | 2023 |
| Redyacht Design ENG Ltd | Professional & scientific | 2019 |
| Reed Consultancy Ltd | Professional & scientific | 2020 |
| Rees Bros Restorations Limited | Manufacturing | 2013 |
| Reform Pathway CIC | Public administration | 2024 |
| Refurbpc Limited | Wholesale & retail | 2012 |
| Regent Park Risborough Management Company Limited | Real estate | 2007 |
| Regentwell Entertainment Ltd | Administrative & support | 2011 |
| Reid Concepts Ltd | Other services | 2022 |
| Reidman Limited | Extraterritorial | 2022 |
| Reign London Home Ltd | Wholesale & retail | 2018 |
| Relish Integrated Ltd | Professional & scientific | 2020 |
| REM Plus Limited | Information & communication | 2006 |
| Remodefi Ltd | Construction | 2022 |
| Remsoft Limited | Information & communication | 2024 |
| Rendez Ltd | Information & communication | 2025 |
| Rene Adefarasin Limited | Administrative & support | 2010 |
| Renegade Networks & Consultancy Ltd | Information & communication | 2023 |
| RES Technical Solutions Limited | Information & communication | 2021 |
| Resonant Group Limited | Financial services | 2018 |
| Resonant Management Limited | Administrative & support | 2021 |
| Resources for IPS LLP | | 2015 |
| Response-Ability Limited | Other services | 2004 |
| Rest&Reform Limited | Arts & recreation | 2025 |
| Retail Global Sourcing Ltd | Wholesale & retail | 2020 |
| Retdev Ltd | Administrative & support | 2010 |
| Retro Junction Entertainment Limited | Wholesale & retail | 2021 |
| Retro Refit Ltd | Wholesale & retail | 2020 |
| Rewind Software Limited | Information & communication | 2026 |
| REX Court RTM Company Ltd | Real estate | 2009 |
| Reynolds Property Services Ltd | Households | 2023 |
| RFS Holdings Ltd | Financial services | 2024 |
| Rfsf Limited | Extraterritorial | 2022 |
| RG Chuter Limited | Professional & scientific | 2019 |
| RG Painting Decorating Ltd | Construction | 2026 |
| Rgate Limited | Real estate | 2017 |
| Rgmr Limited | Professional & scientific | 2006 |
| RGS Business Limited | Extraterritorial | 2009 |
| RGS Environmental Technologies Limited | Administrative & support | 2011 |
| RGS Technology and Innovation Limited | Extraterritorial | 2009 |
| RHB Camera Services Ltd | Information & communication | 2022 |
| Rhodes Packaging Limited | Wholesale & retail | 2010 |
| Rhythmworks Limited | Professional & scientific | 1999 |
| Ricci Solicitors Ltd | Professional & scientific | 2023 |
| Rich Health Care Ltd | Health & social care | 2025 |
| Richard Kanani & Co Ltd | Professional & scientific | 2014 |
| Richard Norman Electrics Limited | Other services | 1974 |
| Richards & Warren LLP | | 2017 |
| Richards Partners Ltd | Administrative & support | 2018 |
| Richford Technology Limited | Information & communication | 2026 |
| Richmond Square Holdings Limited | Real estate | 2025 |
| Rickys Garage Ltd | Wholesale & retail | 2024 |
| Ridare Ltd | Administrative & support | 2024 |
| Ridgard Classic Seats Limited | Manufacturing | 2020 |
| Ridgeback Group Holdings Limited | Financial services | 2022 |
| Ridgeback Projects Limited | Construction | 2017 |
| Ridgebrook Construction Limited | Construction | 2008 |
| Ridgeway Bakery Limited | Manufacturing | 2008 |
| Ridgeway Court (Lindford) Management Company Limited | Households | 2007 |
| Ridley Place Limited | Real estate | 2019 |
| Ridleys (Farnham) Limited | Real estate | 1983 |
| Right Brain Left Brain Limited | Professional & scientific | 2024 |
| Rightstep Management Limited | Professional & scientific | 2006 |
| Rigrider Ltd | Transport & logistics | 2015 |
| Riley Family Limited | Hospitality | 2026 |
| Ringfinite Limited | Administrative & support | 2021 |
| Rioscka Limited | Professional & scientific | 2024 |
| Riot Investments Limited | Financial services | 2019 |
| Rising of the East Promotions and Productions Ltd | Wholesale & retail | 2025 |
| Riskologists Limited | Professional & scientific | 2024 |
| Ritual + Root Limited | Wholesale & retail | 2025 |