| RND Electrical Services Ltd | Construction | 2018 |
| RND Property Services Ltd | Real estate | 2018 |
| RNR Partners Ltd | Agriculture & fishing | 2025 |
| RNS Electrical & Telecom Services Ltd | Construction | 2008 |
| RO Wheatley Solutions Ltd | Professional & scientific | 2024 |
| Road Route Logistics Ltd | Transport & logistics | 2024 |
| Road Safety Audits Limited | Professional & scientific | 2016 |
| Road Transport Refrigeration Limited | Professional & scientific | 2024 |
| Roadmedia Limited | Professional & scientific | 2012 |
| Roadrider Motorcycle Training Ltd | Education | 2008 |
| Roamine Advisory Limited | Financial services | 2013 |
| ROB Winter Argc Ltd | Professional & scientific | 2024 |
| Robco Ltd | Construction | 2023 |
| Robco Properties Ltd | Real estate | 2024 |
| Robert Bottomley Construction Limited | Construction | 2004 |
| Robert Brocklehurst Civil Engineering Limited | Construction | 1997 |
| Robert Clough(Keighley)Limited | Professional & scientific | 1967 |
| Robert Donaldson Investments Ltd | Real estate | 2023 |
| Robert Shields Equestrian Limited | Wholesale & retail | 2010 |
| Robertas Transport Limited | Transport & logistics | 2017 |
| Roberts Renovations and Redevelopment Limited | Real estate | 2021 |
| Roberts' Castings Limited | Manufacturing | 1985 |
| Robertson Baxter Limited | Financial services | 2006 |
| Robertson Groundwork & Construction Ltd | Construction | 2019 |
| Robertson-Jones Property Group Ltd | Real estate | 2025 |
| Robin and ROO Baby Limited | Wholesale & retail | 2019 |
| Robin Hood Court Management Company Limited | Real estate | 2007 |
| Robinsonip Limited | Professional & scientific | 2020 |
| Robiva Developments & Refurbishments Ltd | Construction | 2023 |
| Robiva Properties Ltd | Real estate | 2023 |
| Robiva Property Sales & Lettings Ltd | Real estate | 2023 |
| Robson Construction (Huddersfield) Limited | Construction | 2019 |
| Robuild Limited | Construction | 1997 |
| Robuild Properties Ltd | Real estate | 2008 |
| ROC and Doll Limited | Wholesale & retail | 2001 |
| ROC Properties and Investments Ltd | Real estate | 2026 |
| Rocethical Ltd | Manufacturing | 2018 |
| Rochbury Properties Ltd | Households | 2025 |
| Rochester & Associates Limited | Information & communication | 1998 |
| Rochester UK Ltd | Transport & logistics | 2007 |
| Rock Solid Estates Limited | Construction | 2003 |
| Rockin Ronnies Ltd | Administrative & support | 2017 |
| Rockstar Burgers Ltd | Hospitality | 2024 |
| Rockstar Foodz Ltd | Hospitality | 2024 |
| Rockwood Legal Services Ltd | Administrative & support | 2021 |
| Rockwood Management & Accounting Services Ltd | Administrative & support | 2021 |
| Rodies Repairs & Customs Ltd | Wholesale & retail | 2023 |
| Roebuck Electrical Limited | Construction | 2005 |
| Roebuck Property Limited | Real estate | 2017 |
| Roes Roofing Ltd | Construction | 2023 |
| Rogdia | Administrative & support | 1993 |
| Rogers and Gilleard Drilling Supplies Limited | Wholesale & retail | 2016 |
| Rogers Artisan Bakery Limited | Manufacturing | 2020 |
| Rogers Engineering Services Ltd | Professional & scientific | 2024 |
| Rogers Geotechnical Services Limited | Construction | 2004 |
| Rogue and Wolf Ltd | Wholesale & retail | 2016 |
| Rogue Path Consulting Ltd | Information & communication | 2024 |
| Rohan Hamilton Ltd | Extraterritorial | 2024 |
| Rohan Owen Lewis Hamilton Ltd | Other services | 2024 |
| Roka Business Services Limited | Professional & scientific | 2015 |
| Roka Energy Limited | Professional & scientific | 2011 |
| Rokt Ltd | Professional & scientific | 2010 |
| Roland Philipps Limited | Information & communication | 2015 |
| Roll Container Services | | 1990 |
| Rolla Metcalfe Limited | Real estate | 2018 |
| Rolla Metcalfe Property Management Limited | Real estate | 2021 |
| Rollaloo Limited | Manufacturing | 2018 |
| Rolmacon Global Ltd. | Wholesale & retail | 2015 |
| Roltons Yeast Company,Limited | Wholesale & retail | 1949 |
| Roman W W Limited | Wholesale & retail | 2024 |
| Romans Properties Ltd | Real estate | 2025 |
| Ronan Developments Limited | Construction | 2002 |
| Ronan Limited | Extraterritorial | 2007 |
| Ronnie Hayward Limited | Transport & logistics | 2021 |
| ROOF2ROOF Roofing (NW) Limited | Construction | 2023 |
| Rooh MKS Limited | Health & social care | 2026 |
| Room 2B Limited | Real estate | 2005 |
| Rooms Together Limited | Real estate | 2024 |
| Rooster FRY Ltd | Hospitality | 2021 |
| Root-Arts CIC | Administrative & support | 2025 |
| Roots Products UK Ltd | Wholesale & retail | 2026 |
| Rootx Ltd | Health & social care | 2026 |
| Rootz Grill and Juice Bar Limited | Hospitality | 2023 |
| Ropah Ltd | Health & social care | 2020 |
| ROR7S Holdings Limited | Financial services | 2025 |
| Rosa Massimo Hair Limited | Wholesale & retail | 2014 |
| Roscap Limited | Financial services | 2021 |
| Rose Automatics Ltd | Arts & recreation | 2016 |
| Rose Beauty for Women Limited | Other services | 2016 |
| Rose Building & Waterproofing Products (Castleford) LLP | | 2007 |
| Rose Building & Waterproofing Products Ltd. | Manufacturing | 2000 |
| Rose Building Ventures Ltd | Real estate | 2025 |
| Roseb Ltd | Administrative & support | 2023 |
| Roseberry Housing Ltd | Real estate | 2017 |
| Roseda Holdings Limited | Financial services | 2004 |
| Rosehall Professionals Ltd | Information & communication | 2022 |
| Rosehill Imaging Limited | Health & social care | 2017 |
| Rosetech Limited | Professional & scientific | 2022 |
| Rosewood Health Care Limited | Health & social care | 2007 |
| Rosie Cole ISW Limited | Health & social care | 2024 |