| RAG and Doll Limited | Manufacturing | 2013 |
| Ragnarwindltd Ltd | Construction | 2025 |
| Ragula & Bros Ltd | Wholesale & retail | 2025 |
| RAH Optics Ltd | Health & social care | 2023 |
| Rahesh Limited | Administrative & support | 2025 |
| Rahman Motors Limited | Wholesale & retail | 2019 |
| Raildon Limited | Transport & logistics | 2003 |
| Rainbow Auto Services Ltd | Wholesale & retail | 2023 |
| Rainbow Developments NE Ltd | Households | 2025 |
| Rainbow Nurseries Landscaping Ltd | Professional & scientific | 2006 |
| Raindrops Care Providers Limited | Health & social care | 2025 |
| Rainton Properties Ltd | Real estate | 2020 |
| Raiz Enterprise Ltd | Transport & logistics | 2021 |
| Rajalakshmi North East Limited | Health & social care | 2023 |
| Rajintha Convenience Store Ltd | Wholesale & retail | 2022 |
| RAL Instrumentation Ltd | Professional & scientific | 2015 |
| Ramaiah Life Sciences Ltd | Health & social care | 2018 |
| Ramona Cleaners Ltd | Administrative & support | 2022 |
| Ramp Recruitment Ltd | Administrative & support | 2025 |
| Rams Global Group Ltd | Financial services | 2021 |
| Rams Global Holdings Ltd | Financial services | 2025 |
| Rams M&E Services Ltd | Construction | 2023 |
| Rams Property Investment Ltd | Real estate | 2024 |
| Randa Developments Guisborough Ltd | Real estate | 2004 |
| Rania NE Ltd | Wholesale & retail | 2026 |
| Rania Teesside Ltd | Administrative & support | 2025 |
| Rank Rise Marketing (UK) Ltd | Professional & scientific | 2025 |
| Ransome and SON Finance Co. Limited | Professional & scientific | 1967 |
| Ransome Finance Limited | Professional & scientific | 1983 |
| Ransomes Check Traders Limited | Professional & scientific | 1964 |
| Raojis Enterprises Limited | Hospitality | 2021 |
| Rapid Rank Digital Ltd | Professional & scientific | 2025 |
| Rapid TAN Glow NE Limited | Other services | 2026 |
| Rapid TAN Teesside Limited | Other services | 2025 |
| Rare Media Ltd | Information & communication | 2022 |
| Rasbery UK Ltd | Health & social care | 2022 |
| Rase Solutions Northern Ltd | Manufacturing | 2025 |
| Rastic Constructions Ltd | Construction | 2026 |
| Raven Infotech Ltd | Information & communication | 2026 |
| Ravensbower Limited | Extraterritorial | 1981 |
| Ravenswick Hall Farms Ltd | Agriculture & fishing | 2024 |
| Rawaf Trading Ltd | Wholesale & retail | 2025 |
| Rawvival Limited | Other services | 2024 |
| RAY Grier Mechanical Services Limited | Professional & scientific | 2024 |
| Raydales Electricals Limited | Construction | 2018 |
| Raydales Properties Limited | Real estate | 2026 |
| Rayners Recoveries Ltd | Wholesale & retail | 2023 |
| Raza Hajj and Umrah Ltd | Administrative & support | 2011 |
| RB Halal Cash & Carry Ltd | Wholesale & retail | 2024 |
| RB Halthcare UK Limited | Health & social care | 2015 |
| RB Holdco Ltd | Financial services | 2023 |
| RB Holdings North East Limited | Financial services | 2025 |
| RB Joinery & Building Ltd | Construction | 2023 |
| RB Productions Limited | Wholesale & retail | 2025 |
| RB Services NE Ltd | Health & social care | 2022 |
| RB TM Services Ltd | Extraterritorial | 2021 |
| RBC Consultants Ltd | Administrative & support | 2022 |
| Rbhb Limited | Other services | 2016 |
| RBM Access Solutions Ltd | Professional & scientific | 2024 |
| Rbyy Holdings Ltd | Financial services | 2026 |
| RC Attractions Limited | Arts & recreation | 2014 |
| RC Properties NE Ltd | Real estate | 2019 |
| RC Wind Solution Limited | Professional & scientific | 2023 |
| Rccg Divine Throne Ltd | Other services | 2022 |
| Rcef Properties Ltd | Real estate | 2024 |
| Rchina 2019 Ltd | Hospitality | 2019 |
| RD Inspection Ltd | Professional & scientific | 2013 |
| Rdaley Ltd | Professional & scientific | 2023 |
| RDC Engineering Limited | Construction | 2010 |
| RDC Rope Access Limited | Construction | 2014 |
| RDC Ropetechs NE Limited | Construction | 2026 |
| RDW Property Group Limited | Real estate | 2024 |
| RE Engernieering Services Ltd | Professional & scientific | 2025 |
| Re-Ya Express Ltd | Transport & logistics | 2021 |
| Re:Nw Aesthetics Limited | Other services | 2023 |
| Re:Thread Ltd | Wholesale & retail | 2025 |
| Re:Wired Museum & Arcade CIC | Arts & recreation | 2025 |
| REA Access Ltd | Mining & quarrying | 2018 |
| REA Funeral Service Ltd | Other services | 2026 |
| Read Mill Limited | Real estate | 2002 |
| Ready Box Ltd | Hospitality | 2019 |
| Ready CEM Limited | Manufacturing | 2023 |
| Ready MIX Group Limited | Financial services | 2019 |
| Ready MIX Tees Valley Ltd | Manufacturing | 2008 |
| Ready SET Home Solutions Ltd | Other services | 2025 |
| Real Premium Solutions Limited | Water & waste | 2026 |
| Real Red Goat Ltd | Real estate | 2024 |
| Realign Therapy Ltd | Health & social care | 2025 |
| Reality Enterprise Ltd | Wholesale & retail | 2007 |
| Reap JIU Jitsu Ltd | Wholesale & retail | 2021 |
| Rebecca Hodgson Freelance Trainer & Assessor Limited | Education | 2017 |
| Rebel Cartel Ltd | Wholesale & retail | 2021 |
| Rebelution CIC | Other services | 2025 |
| Reborn Collection Ltd | Wholesale & retail | 2021 |
| Recco Productions Ltd | Information & communication | 2026 |
| Recovery Connections | Health & social care | 2008 |
| Recovery Connections Enterprise Limited | Hospitality | 2019 |
| Recovery IS NO Race Limited | Professional & scientific | 2025 |
| Recruitment Sense Ltd | Professional & scientific | 2017 |
| Recyclerite UK Limited | Water & waste | 2014 |