| RK Civils and Groundworks Ltd | Construction | 2025 |
| RKC Events Limited | Construction | 2018 |
| RKT Grading Ltd | Wholesale & retail | 2022 |
| RL & Sons Property Ltd | Real estate | 2025 |
| RL Fire Protection Limited | Construction | 2007 |
| RLB Electrical Services Limited | Wholesale & retail | 2010 |
| RLB Renovations Ltd | Construction | 2023 |
| RMC Buildings Ltd | Construction | 2021 |
| Rmci Ltd | Professional & scientific | 2015 |
| Rmts (Holdings) Ltd | Financial services | 2024 |
| RN Glazing Ltd | Construction | 2011 |
| RNK Express Ltd | Wholesale & retail | 2020 |
| RNR Hospitality Ltd | Hospitality | 2024 |
| Road Master Driver Training Limited | Education | 2024 |
| Roadside Technologies Group Ltd | Professional & scientific | 2026 |
| Roadside Technologies Ltd | Professional & scientific | 2015 |
| Roaring Mouse Public Relations Limited | Administrative & support | 2012 |
| ROB Earnshaw Training Limited | Other services | 2005 |
| Robert Byard Haulage Limited | Transport & logistics | 2016 |
| Robert Foster Estates Limited | Real estate | 2025 |
| Robert Foster Farmer and Butcher Ltd | Wholesale & retail | 2024 |
| Robert Miles Automotive Limited | Wholesale & retail | 2003 |
| Robin C. Brown Group Limited | Construction | 1999 |
| Robinson (Overseas) Limited | Professional & scientific | 1997 |
| Robinson Consumer Packaging Limited | Professional & scientific | 1943 |
| Robinson Paperbox Packaging Limited | Manufacturing | 2003 |
| Robinson Plastic Packaging (Stanton Hill) Limited | Manufacturing | 2006 |
| Robinson Plastic Packaging Limited | Manufacturing | 2003 |
| Robinson PLC | Professional & scientific | 1893 |
| Robinson-White Plastics Limited | Professional & scientific | 1970 |
| Robinsons Caravans Partnership LLP | | 2019 |
| Robinsons' Pensions Limited | Professional & scientific | 1963 |
| Robit GB Ltd | Manufacturing | 1973 |
| Robit UK Ltd | Professional & scientific | 2016 |
| Rochma Holdings Limited | Professional & scientific | 2023 |
| Rock Environmental Limited | Professional & scientific | 2020 |
| Rock House (Chesterfield) Ltd | Other services | 2012 |
| Rock Plumbing Heating and Electrical Limited | Construction | 2016 |
| Rockcliffe Holdings Limited | Real estate | 2026 |
| ROD Gratton Ltd | Construction | 2010 |
| Roddymoor Ltd | Wholesale & retail | 2021 |
| ROE Design and Build Limited | Construction | 2019 |
| ROE Development Consultants Limited | Construction | 2019 |
| ROE Developments (UK) Limited | Construction | 2005 |
| ROE Developments Limited | Construction | 2019 |
| Roecliffe Marketing Ltd | Other services | 2021 |
| Rogers Land & Property Ltd | Real estate | 2024 |
| Rogue Levels Media Limited | Arts & recreation | 2015 |
| Rohan Aked-Slack Ltd | Construction | 2007 |
| ROL Mansfield Limited | Hospitality | 2025 |
| Rolec Limited | Manufacturing | 1991 |
| Roll UP & Shine Ltd | Wholesale & retail | 2013 |
| Roma Taxi Ltd | Transport & logistics | 2026 |
| Roman Rise Limited | Real estate | 2015 |
| Roman Royce Clearances Limited | Other services | 2025 |
| Roman Royce Removals Limited | Professional & scientific | 2019 |
| Romley Caravan Storage Limited | Hospitality | 2015 |
| Rompa Limited | Wholesale & retail | 2000 |
| Ronald Clark Limited | Construction | 2014 |
| Ronin Project Management Limited | Professional & scientific | 2019 |
| Ronrock Transport Ltd | Construction | 2020 |
| Roof Safety Solutions Ltd | Construction | 2008 |
| Rooftech Building Solutions Ltd | Construction | 2017 |
| Rose & Co Carpentry Ltd | Construction | 2026 |
| Rose & Crown Eckington Limited | Hospitality | 2023 |
| Rose Holly Properties Ltd | Financial services | 2016 |
| Rose House Support Ltd | Health & social care | 2020 |
| Rose Renovate Ltd | Construction | 2025 |
| Rosehill Whisky Investments Limited | Wholesale & retail | 2023 |
| Rosewarne Property Limited | Construction | 2015 |
| Rota London Ltd | Hospitality | 2025 |
| Rother Valley Holdings Ltd | Real estate | 2024 |
| Rotherham Construction Academy Limited | Education | 2022 |
| Rotherham Skills Academy Limited | Extraterritorial | 2020 |
| Rothervale Construction Limited | | 1969 |
| Rothman and Wilson Property Investments Limited | Real estate | 2024 |
| Roundhay Services Ltd | Professional & scientific | 2026 |
| Rowanoak Ltd | Manufacturing | 2007 |
| Roxy Rhodes Ltd | Professional & scientific | 2021 |
| Roystons Ltd | Wholesale & retail | 2003 |
| RP Global Event Solutions Ltd | Arts & recreation | 2025 |
| RP Holdings Chesterfield LLP | | 2026 |
| RPC Welding & Fabrication Limited | Construction | 2008 |
| Rpcf Ltd | Construction | 2016 |
| RPH Plastering and Drylining Ltd | Construction | 2025 |
| Rptradersmedical Group Ltd | Wholesale & retail | 2021 |
| Rptradersmedical Ltd | Wholesale & retail | 2024 |
| RPW Plumbing & Heating Limited | Construction | 2019 |
| RR Asian Bar and Grill Limited | Hospitality | 2025 |
| RRD Estates Limited | Real estate | 2007 |
| RRD Motor Factors Ltd | Extraterritorial | 2026 |
| RSE Ltd | Administrative & support | 2021 |
| RSK Construction Limited | Construction | 2007 |
| Rskang Developments Ltd | Real estate | 2024 |
| RTB Developments Limited | Construction | 2026 |
| RTB Testing Solutions Ltd | Information & communication | 2012 |
| Rtb-Uk Limited | Construction | 2015 |
| Ruane Technical Services Limited | Professional & scientific | 2021 |
| Ruane Transport Services Limited | Transport & logistics | 1992 |
| RUBBLE2 Ltd | Construction | 2026 |