| Repair Republic Limited | Information & communication | 2015 |
| Reparation Nation Limited | Financial services | 2023 |
| Reproxy Limited | Administrative & support | 2016 |
| RES Facility Services Limited | Administrative & support | 2000 |
| Reset Studios Mind Body Ltd | Arts & recreation | 2026 |
| Residex Ltd | Administrative & support | 2023 |
| Reso Management Ltd | Wholesale & retail | 2022 |
| Resolute Business Consulting Limited | Professional & scientific | 2020 |
| Resolutions Services Limited | Public administration | 2022 |
| Resonate Business Solutions Limited | Professional & scientific | 2008 |
| Resonate Cloud Services Limited | Information & communication | 2010 |
| Resources Zillion Company Ltd | Health & social care | 2019 |
| Responsible Enterprises Advisory Ltd | Professional & scientific | 2026 |
| Responsible Packaging Ltd | Extraterritorial | 2012 |
| Restorative Mobility Solutions Limited | Health & social care | 2024 |
| Results Based Cleaning Ltd | Administrative & support | 2025 |
| Retail Cache Limited | Information & communication | 2025 |
| Retford Kebab Ltd | Hospitality | 2022 |
| Retro and Vintage Clothes Limited | Wholesale & retail | 2023 |
| Retro Roller Catering Ltd | Hospitality | 2024 |
| Reva Express Ltd | Wholesale & retail | 2019 |
| Revag Ltd | Professional & scientific | 2020 |
| Revamp Entertainment Ltd | Information & communication | 2020 |
| Revan Hair Ltd | Other services | 2024 |
| Revelation Trade Systems Ltd | Financial services | 2025 |
| Revelling Ltd | Wholesale & retail | 2026 |
| Review Plus Ltd | Health & social care | 2023 |
| Revival Christian Church of Enfield | Other services | 2010 |
| Revival Direct Limited | Professional & scientific | 2010 |
| Revol Energy Ltd | Manufacturing | 2024 |
| Revs Automobilia Limited | Other services | 2024 |
| Revved UP Repairs Ltd | Wholesale & retail | 2025 |
| Rexford Resource Ltd | Other services | 2019 |
| Rexis Media Limited | Administrative & support | 2025 |
| Rexo Enterprises Limited | Construction | 2021 |
| Rexo Properties Limited | Real estate | 2026 |
| RF Hospitalities Ltd | Public administration | 2022 |
| Rfe's OT in One Solution Limited | Other services | 2015 |
| RFL Decontamination Services Limited | Health & social care | 2018 |
| RFL Property Services Limited | Administrative & support | 2018 |
| RFX Group Ltd | Wholesale & retail | 2025 |
| RG Accounting Ltd | Professional & scientific | 2020 |
| Rhama Plus Limited | Health & social care | 2023 |
| Rhapsody Management Limited | Arts & recreation | 2016 |
| RHD Property Services Ltd | Real estate | 2024 |
| Rhema Estate Management Ltd | Real estate | 2017 |
| Rheuma & Company Limited | Administrative & support | 2015 |
| Rhhh Studios Ltd | Manufacturing | 2020 |
| Rhincodon Ltd | Administrative & support | 2010 |
| RHM Collections Limited | Wholesale & retail | 2025 |
| RHQ Digital Ltd | Information & communication | 2017 |
| Rhyme Consulting Ltd | Professional & scientific | 2022 |
| Rhys Neville Commercial and Domestic Services Limited | Households | 2023 |
| Rhys Oliver Ltd | Administrative & support | 2025 |
| Rhyspollard Ltd | Transport & logistics | 2025 |
| Ribblesdale N11 Ltd | Real estate | 2020 |
| Ribbon & Wicker Ltd | Wholesale & retail | 2022 |
| Rica Jewellery Ltd | Wholesale & retail | 2023 |
| Richard Swash Limited | Other services | 2013 |
| Richard T Moore at Lavender Hill Limited | Wholesale & retail | 2016 |
| Richgina Healthcare Limited | Health & social care | 2022 |
| Richmond & Virgo Limited | Professional & scientific | 2002 |
| Ricohauls Ltd | Transport & logistics | 2022 |
| Ride the Wave Limited | Professional & scientific | 2014 |
| Ridge Construction Services Ltd | Construction | 2026 |
| Ridgemount Gardens Residents Association Limited | Households | 2000 |
| Ridgeview Healthcare Limited | Health & social care | 2006 |
| Ridgeway Composting Limited | Water & waste | 2024 |
| Ridgeway Enterprises Ltd | Extraterritorial | 2004 |
| Ridi Building Services Limited | Construction | 2022 |
| Ridings Court (Enfield) Management Limited | Households | 1965 |
| Rifs Hair Limited | Other services | 2018 |
| RIG Scaffolding Limited | Construction | 2023 |
| Right Home Offer Ltd | Real estate | 2025 |
| Right M&E Ltd | Construction | 2018 |
| Right Property Investment London Ltd | Real estate | 2020 |
| Right Recruitment Ltd | Administrative & support | 2020 |
| Right Step Construction Ltd | Construction | 2026 |
| Right Vertex UK Ltd | Real estate | 2024 |
| Rigidized Metals Limited | Manufacturing | 1974 |
| Rigitex Metal Corporation Limited | Manufacturing | 1981 |
| Riklu Catering Equipment & Event Supplies Limited | Wholesale & retail | 2020 |
| Rikujou Ltd | Real estate | 2009 |
| Riley Court Management Company Limited | Households | 1979 |
| RIM Construction Ltd | Construction | 2025 |
| Rimex Metals (U.K.) Limited | Manufacturing | 1959 |
| Rimex Metals Group Limited | Manufacturing | 2013 |
| Rimex Metals Materials Limited | Manufacturing | 2017 |
| Rina Sahil Ltd | Hospitality | 2019 |
| Rincewind Ltd | Wholesale & retail | 2021 |
| Ringwood Corporation Limited | Real estate | 1999 |
| Risborough Court Limited | Real estate | 2007 |
| Rise Transformation Ltd | Professional & scientific | 2025 |
| Rise UP Coaching Limited | Other services | 2022 |
| Rishabhdev Care Services Ltd | Water & waste | 1998 |
| Rishabhdev Developments Ltd | Construction | 2014 |
| Rishabhdev Ltd | Real estate | 2004 |
| Rising Young Builders CIC | Health & social care | 2024 |
| Rita Fancy Goods Limited | Wholesale & retail | 1969 |
| Rital City Ltd | Construction | 2025 |