| RLS Training Academy Ltd | Education | 2025 |
| RMO Education Ltd | Education | 2026 |
| RO Post Productions Limited | Administrative & support | 2022 |
| Ro-Uk Holdings Limited | Wholesale & retail | 2012 |
| Roadcam (U.K.) Limited | Professional & scientific | 1998 |
| Roadcam Limited | Professional & scientific | 1998 |
| Roalex Ltd | Transport & logistics | 2013 |
| ROB Bailey Engine Services Limited | Administrative & support | 2026 |
| Rob-Express Ltd | Transport & logistics | 2020 |
| Robert Langley Consultants Limited | Professional & scientific | 2008 |
| Robert West Construction Limited | Construction | 2004 |
| Robins Services Ltd | Administrative & support | 2026 |
| Robinson Plant Services Limited | Agriculture & fishing | 2006 |
| Rock Driver Hire Limited | Administrative & support | 2012 |
| Rockcode Software Limited | Information & communication | 2024 |
| Rockingham Systems Ltd | Manufacturing | 2005 |
| Rockshor Holdings Limited | Wholesale & retail | 2020 |
| Rockstar Tattoo Removal Limited | Administrative & support | 2014 |
| Roclair Ltd | Real estate | 2023 |
| ROK Consulting Ltd | Professional & scientific | 2024 |
| Roman Burlacu Limited | Transport & logistics | 2026 |
| Ronin Strength Ltd | Administrative & support | 2021 |
| Roof-Pro Limited | Extraterritorial | 1996 |
| Roofing Services by T. Ltd | Construction | 2026 |
| Roomsaloft Limited | Construction | 2015 |
| Roost Estate Planning Ltd | Information & communication | 2024 |
| Roost Renovations Limited | Households | 2021 |
| Root Smiles Ltd | Health & social care | 2024 |
| Rope Tech-Elec Ltd | Professional & scientific | 2013 |
| Rosa Building Co Limited | Construction | 2026 |
| Rosary Haulage Ltd | Transport & logistics | 2018 |
| Rose Attridge Ltd | Professional & scientific | 2025 |
| Rose Cottage Woodford Limited | Health & social care | 2001 |
| Rosefab Ltd | Health & social care | 2013 |
| Rosemount Electrical and Mechanical Ltd | Construction | 2007 |
| Roseoak Ltd | Professional & scientific | 2010 |
| Roseoak Ventures Limited | Real estate | 2024 |
| Roserol CIC | Hospitality | 2026 |
| Roseville Care Ltd | Public administration | 2022 |
| Ross Driving Services Ltd | Transport & logistics | 2014 |
| Rothenberger (U.K.) Limited | Wholesale & retail | 1971 |
| Rothwell and Desborough Futures Limited | Public administration | 2003 |
| Rothwell Cleaning Services Limited | Administrative & support | 2015 |
| Rothwell Convenience Limited | Wholesale & retail | 2020 |
| Rothwell Corinthians Football Club Limited | Arts & recreation | 2013 |
| Rothwell Farming LLP | | 2012 |
| Rothwell Friar Limited | Hospitality | 2025 |
| Rothwell Hair TR Limited | Other services | 2024 |
| Rothwell Manor Park Bowling Club Limited | Arts & recreation | 2009 |
| Rothwell Nails & Spa Ltd | Other services | 2018 |
| Rothwell Physiotherapy Limited | Health & social care | 2012 |
| Rothwell Preservation Trust | Other services | 1985 |
| Rothwell Tiles & Bathrooms Limited | Wholesale & retail | 2007 |
| Route 85 Logistics Ltd | Transport & logistics | 2024 |
| Routepulse Logistics Ltd | Transport & logistics | 2025 |
| Rowsell Ltd | Information & communication | 2016 |
| ROY Christie (Racecourse) Limited | Arts & recreation | 1975 |
| ROY Dilan Malisauskas Ltd | Extraterritorial | 2022 |
| Roydon Limited | Administrative & support | 1931 |
| Roydon Nominees Limited | Administrative & support | 1990 |
| RPG DEV Ltd | Construction | 2026 |
| RRM Ltd | Transport & logistics | 2025 |
| RS Power Limited | Other services | 2005 |
| RS Zuze Ltd | Health & social care | 2014 |
| RSB Locum Ltd | Professional & scientific | 2023 |
| RSC Investments Ltd | Real estate | 2019 |
| RSN Exim Ltd. | Wholesale & retail | 2016 |
| Rsps Solutions Ltd | Information & communication | 2012 |
| RT Analytics Ltd | Administrative & support | 2026 |
| RT Specialist Services Limited | Health & social care | 2026 |
| Rugby Car Wash Limited | Wholesale & retail | 2018 |
| Rugby Classics Limited | Wholesale & retail | 1999 |
| RUH Bowl Ltd | Manufacturing | 2026 |
| Ruhe Global Resources Ltd | Hospitality | 2020 |
| Ruko Ltd | Transport & logistics | 2017 |
| Rumrat Aviate Limited | Real estate | 2022 |
| Rumrat Cultivate Limited | Financial services | 2024 |
| Rumrat Incubate Limited | Financial services | 2025 |
| Rumrat Limited | Real estate | 2019 |
| Rumrat Renovate Limited | Construction | 2020 |
| Runham House Limited | Professional & scientific | 2015 |
| Runvisual (UK) Holdings Limited | Manufacturing | 2017 |
| Runvisual (UK) Limited | Manufacturing | 2008 |
| Ruscoe Brands Ltd | Wholesale & retail | 2024 |
| Ruscoe Trading Ltd | Wholesale & retail | 2024 |
| Rusev Services Ltd | Administrative & support | 2017 |
| Rushden Nails & Beauty Ltd | Other services | 2026 |
| Russel Aviation Services Ltd | Professional & scientific | 2013 |
| Russell Dean Holdings Limited | Real estate | 2001 |
| Russell James Windows & Doors Ltd | Manufacturing | 2023 |
| Russell Street Convenience Store Ltd | Wholesale & retail | 2022 |
| Russell Vision Limited | Real estate | 2017 |
| Russet Property Limited | Real estate | 2024 |
| Rutecki Security Ltd | Administrative & support | 2023 |
| Rutland Coaching Ltd | Professional & scientific | 2018 |
| Rutland Recycling Services Limited | Extraterritorial | 1994 |
| Ruwaya Healthcare Ltd | Health & social care | 2025 |
| Ryan a Jones Ltd | Professional & scientific | 2023 |
| Rydan Holdings Ltd | Construction | 2025 |
| Ryecroft Foods Limited | Manufacturing | 1983 |