| Rjcateringcastle Limited | Hospitality | 2025 |
| RJH Building Ltd | Construction | 2024 |
| RJL Health Ltd | Health & social care | 2026 |
| Rjll INK Ltd | Arts & recreation | 2020 |
| RJM Law Limited | Professional & scientific | 2020 |
| Rjmhh Ltd | Hospitality | 2026 |
| Rjprosthetics Ltd | Manufacturing | 2026 |
| RJR Business Solutions Limited | Professional & scientific | 2017 |
| RJS Northeast Limited | Real estate | 2025 |
| RK Bathroom Solutions Ltd | Construction | 2019 |
| RK ITS Consultancy Limited | Information & communication | 2026 |
| RK Mobile and Computers Ltd | Wholesale & retail | 2022 |
| Rkaid Ltd | Information & communication | 2024 |
| Rkautocare Ltd | Wholesale & retail | 2017 |
| RKB Solutions Ltd | Professional & scientific | 2005 |
| Rkhpharma Limited | Health & social care | 2024 |
| Rklk Ltd | Hospitality | 2026 |
| Rknb Property Ltd | Real estate | 2025 |
| Rkom Property Ltd | Real estate | 2025 |
| RKS Direct Leads Ltd | Professional & scientific | 2025 |
| RKS Future Limited | Other services | 2013 |
| RKS Locums Limited | Health & social care | 2011 |
| RKW Investment Holdings Ltd | Professional & scientific | 2024 |
| RL Constable Limited | Professional & scientific | 2007 |
| RL Flooring Limited | Construction | 2025 |
| RL Groundworks Ltd | Administrative & support | 2019 |
| RL Park Limited | Professional & scientific | 2017 |
| RL Purvis Limited | Professional & scientific | 2007 |
| RL Robson Ltd | Agriculture & fishing | 2022 |
| RL Wills Limited | Professional & scientific | 2015 |
| RL Wilson Limited | Professional & scientific | 2021 |
| Rlao Limited | Financial services | 2022 |
| RLB Properties Limited | Real estate | 2002 |
| RLM Windows Doors and Conservatories Ltd | Construction | 2017 |
| RLS Construction (NE) Limited | Construction | 2009 |
| RLS Transport Ltd | Transport & logistics | 2021 |
| RLS Ventures Limited | Administrative & support | 2008 |
| RLT Recruitment Limited | Administrative & support | 2017 |
| RM (UK) Trading Ltd | Wholesale & retail | 2015 |
| RM Creative Driveways Limited | Administrative & support | 2026 |
| RM Psychology Services Limited | Health & social care | 2026 |
| RM Services (Tool Hire) Limited | Wholesale & retail | 2005 |
| Rman Unisex Ltd | Other services | 2024 |
| RMC Property Developments Limited | Construction | 2019 |
| RMC Sales Centre Limited | Wholesale & retail | 2015 |
| Rmcs Renewables Ltd | Administrative & support | 2020 |
| RMD Legal Ltd | Professional & scientific | 2020 |
| Rmfk Ltd | Hospitality | 2025 |
| RMS Groundwater Strategies Ltd | Professional & scientific | 2025 |
| RMT Accountants & Business Advisors Ltd | Professional & scientific | 2006 |
| RMT Medical Accountants Ltd | Extraterritorial | 2013 |
| RMT Technology Limited | Information & communication | 2021 |
| RN & R Properties Limited | Construction | 2025 |
| Rnah Limited | Other services | 2024 |
| RNC Contracts Ltd | Construction | 2020 |
| RND Soft Solutions Ltd | Information & communication | 2016 |
| RNJ Partnership LLP | | 2006 |
| RNP Property Management Ltd | Real estate | 2026 |
| Rnsl Ltd | Professional & scientific | 2025 |
| RNT9 Ltd | Wholesale & retail | 2025 |
| RNZ Group Limited | Financial services | 2026 |
| Ro-Auto-Fix Ltd | Wholesale & retail | 2025 |
| Road 51 Ltd | Information & communication | 2025 |
| Road Island Sporting Ltd | Other services | 2021 |
| Road Networks AI Limited | Information & communication | 2026 |
| Road Ready Repair Limited | Wholesale & retail | 2023 |
| Roadkill Games Limited | Information & communication | 2022 |
| Roadrunner Travel Ltd | Transport & logistics | 2021 |
| Roadsafe Logistics Limited | Construction | 2019 |
| Roadsafe Traffic Management (North East) Ltd | Construction | 2024 |
| Roadway House Limited | Real estate | 2022 |
| Roal Investments LP | | 2017 |
| Roamr Ltd | Information & communication | 2025 |
| Roar Digital Marketing Ltd | Information & communication | 2016 |
| ROB Clarkson Consultancy Limited | Wholesale & retail | 2022 |
| ROB Morton at Motopilot Ltd | Wholesale & retail | 2026 |
| Robani Investments Ltd | Real estate | 2026 |
| Robb & Weakford Limited | Real estate | 1936 |
| Robbie Thompson International Ltd | Arts & recreation | 2019 |
| Robbiemike Ltd | Real estate | 2018 |
| Robert Laverick Cabinetry Ltd | Manufacturing | 2025 |
| Robert Mackey Commerce Ltd | Wholesale & retail | 2023 |
| Robert Marshall Optical Limited | Wholesale & retail | 2020 |
| Robert Muckle Limited | Extraterritorial | 2005 |
| Robert Steven Studios Ltd | Professional & scientific | 2024 |
| Roberts Developments Limited | Construction | 2023 |
| Roberts Edge Limited | Professional & scientific | 2025 |
| Roberts Environmental Limited | Professional & scientific | 2012 |
| Roberts Eyecare Limited | Health & social care | 2008 |
| Robertshaw Financial Planning Limited | Financial services | 2024 |
| Robertson & Howard Plumbing Limited | Construction | 2006 |
| Robertson Assoc. Ltd | Professional & scientific | 2020 |
| Robertson Hill Associates Ltd | Professional & scientific | 2024 |
| Robertson Surfacing Ltd | Construction | 2020 |
| Robie House Ltd | Real estate | 2004 |
| Robin Reza Ltd | Arts & recreation | 2020 |
| Robinson & Howe Limited | Manufacturing | 2010 |
| Robinson Residential NE Limited | Real estate | 2022 |
| Robinson Truck Bodies Limited | Manufacturing | 2024 |
| Robinsons Florists LLP | | 2009 |