| Retrac Aurum Limited | Real estate | 2016 |
| Retrac One Ltd | Health & social care | 2023 |
| Retrofitpro Limited | Professional & scientific | 2022 |
| Retroflip Limited | Wholesale & retail | 2025 |
| Return Services Ltd | Professional & scientific | 1998 |
| Revamp Training Company Ltd | Education | 2018 |
| Reveal Studios Ltd | Information & communication | 2026 |
| Reversionary Assets 2 Limited | Real estate | 2001 |
| Reversionary Assets Limited | Real estate | 2001 |
| Reverso Consultancy Limited | Professional & scientific | 2016 |
| Revire & Co Limited | Wholesale & retail | 2025 |
| Revive & Reinvent Limited | Construction | 2025 |
| Revive Digital Consultants Limited | Professional & scientific | 2023 |
| Revive Property Investments Limited | Real estate | 2025 |
| Revive Rides Limited | Wholesale & retail | 2025 |
| Revolution Windows Ltd | Construction | 2017 |
| Revtec Mobile Mechanic Limited | Wholesale & retail | 2024 |
| Revtech Garage Ltd | Wholesale & retail | 2025 |
| Revuedge Ltd | Professional & scientific | 2024 |
| Rewarding Learning Ltd | Information & communication | 2026 |
| Rewnd Ltd | Wholesale & retail | 2025 |
| Rexel Property Developments Limited | Real estate | 2006 |
| Reyes Builders Ltd | Construction | 2026 |
| Reyosi Ltd | Other services | 2025 |
| RFZ Properties Ltd | Real estate | 2025 |
| RG Grill Darlington Ltd | Hospitality | 2019 |
| RG NDT Limited | Professional & scientific | 2009 |
| RG Wind Ltd | Other services | 2017 |
| RG10X Limited | Financial services | 2025 |
| RGB Rigging Services Limited | Construction | 2020 |
| RGL Technical Ltd | Construction | 2026 |
| RGS Autopaints Ltd | Wholesale & retail | 2020 |
| RGS Group Limited | Administrative & support | 2020 |
| RH Services Group Limited | Financial services | 2022 |
| RHE Trading Limited | Administrative & support | 2012 |
| Rhino Consulting Engineers Ltd | Professional & scientific | 2026 |
| Rhucroft Property Investments Ltd | Real estate | 2020 |
| Rhys a Williams Ltd | Construction | 2020 |
| Rhythm and Rootz Ltd | Hospitality | 2026 |
| Rhythm of Joy CIC | Education | 2024 |
| Rhythms of Africa Tees Valley CIC | Education | 2023 |
| Ricbrantomvictoria Limited | Hospitality | 2025 |
| Rich Properties Limited | Real estate | 2019 |
| Richard Lamb Consulting Ltd | Professional & scientific | 2023 |
| Richard Vickers Engineering Limited | Professional & scientific | 2016 |
| Richmond Brooks 2025 Ltd | Professional & scientific | 2025 |
| Richmond Hill Limited | Extraterritorial | 1996 |
| Riddle Engineering Limited | Construction | 2019 |
| Ridgeway Developments (NE) Limited | Construction | 2005 |
| Ridgo Logistics Ltd | Transport & logistics | 2026 |
| Ridhan Retail Ltd | Wholesale & retail | 2025 |
| Ridirectresponse Limited | Wholesale & retail | 2026 |
| Ridsdale & Co.Limited | Manufacturing | 1935 |
| Rigger Shackle Ltd | Construction | 2022 |
| Rigging & Lifting Solutions Ltd | Construction | 2021 |
| Right Choice Independent Financial Solutions Limited | Financial services | 2018 |
| Right Homes Building & Maintenance Services Ltd | Real estate | 2015 |
| Right Price Carpets (UK) Limited | Wholesale & retail | 2006 |
| Right Priced Properties Ltd | Real estate | 2019 |
| Right Way NE Ltd | Real estate | 2021 |
| Rightrig Industrial Ltd | Construction | 2026 |
| RIJ Limited | Wholesale & retail | 2020 |
| Riley Arlia and Orla Scaffolding Limited | Construction | 2026 |
| Riley's Piping Services Ltd | Manufacturing | 2023 |
| Rimick Flooring Ltd | Wholesale & retail | 2021 |
| Rinnen UK Limited | Transport & logistics | 1992 |
| Rintys Golf Ltd | Hospitality | 2025 |
| Riponpharm Limited | Wholesale & retail | 2026 |
| Risa Access Ltd | Administrative & support | 2024 |
| Risey Ltd | Wholesale & retail | 2026 |
| Rising Phoenix Games Limited | Arts & recreation | 2023 |
| Rite Tech Group Ltd | Administrative & support | 2022 |
| River Signs and Print Ltd | Manufacturing | 2022 |
| River Tees More | Education | 2023 |
| River Tees Multi-Academy Trust | Education | 2015 |
| River Tees Scaffolding Limited | Administrative & support | 2023 |
| River Tees(Tees Valley)International NET-ZERO(30-50) Developments. Limited | Construction | 2023 |
| River Wood and Ceiling Limited | Manufacturing | 2024 |
| Riverdale Bidco Limited | Health & social care | 2018 |
| Riverdale Dental Care Limited | Health & social care | 2019 |
| Riverdale Healthcare Limited | Health & social care | 2018 |
| Riverdale JV Holdco Limited | Health & social care | 2025 |
| Riverdale Midco Limited | Health & social care | 2018 |
| Riverdale Topco Limited | Health & social care | 2018 |
| Riverdale Tradeco Limited | Health & social care | 2018 |
| Riverrenewables Limited | Construction | 2024 |
| Riverside Auto Parts Ltd | Water & waste | 2026 |
| Riverside Cafe Ltd | Hospitality | 2025 |
| Riverside Landscaping Ltd | Administrative & support | 2019 |
| Riverside MOT & Autocare Centre Ltd | Wholesale & retail | 2025 |
| Riverside Rope Access Ltd | Administrative & support | 2022 |
| Riverside Tyres Autocare Ltd | Wholesale & retail | 2026 |
| Riverstone Academy Ltd | Education | 2026 |
| Riverview Flooring Ltd | Construction | 2022 |
| Riverwood Joinery Ltd | Manufacturing | 2020 |
| RIZ Pizza ( Teesside) Ltd | Hospitality | 2025 |
| Rizvi Trades Ltd | Wholesale & retail | 2025 |
| RJ Consultancy (North) Limited | Professional & scientific | 2019 |
| RJ Engineering Rtft Limited | Construction | 2016 |
| Rjac SPV Ltd | Construction | 2026 |