| Red Marsh Developments Limited | Construction | 2019 |
| Red Oak Wealth Management Ltd | Financial services | 2013 |
| Red Top Decor Limited | Construction | 2014 |
| Red-Car Taxis Ltd | Transport & logistics | 2020 |
| Redcar & Cleveland Legal Services Limited | Financial services | 2021 |
| Redcar and Cleveland Voluntary Development Agency | Information & communication | 1992 |
| Redcar Athletic FC Ltd | Arts & recreation | 2020 |
| Redcar BS Ltd | Construction | 2023 |
| Redcar Childrens Legal Services Limited | Professional & scientific | 2023 |
| Redcar Civstruc Ltd | Construction | 2020 |
| Redcar Convenience Store Ltd | Wholesale & retail | 2024 |
| Redcar Decorators Merchants Limited | Wholesale & retail | 1987 |
| Redcar Development Trust | Arts & recreation | 2010 |
| Redcar Engineering Ltd | Professional & scientific | 2024 |
| Redcar Gymnastics and Sports Club | Arts & recreation | 2011 |
| Redcar Holiday Lettings Limited | Hospitality | 2023 |
| Redcar Hospitality Ltd | Hospitality | 2014 |
| Redcar Kitchen Ltd | Hospitality | 2023 |
| Redcar Letting and Sales Company Ltd | Real estate | 2006 |
| Redcar Memorials Ltd | Wholesale & retail | 2025 |
| Redcar Nails & Spa Ltd | Other services | 2025 |
| Redcar Pizza Shop Ltd | Hospitality | 2024 |
| Redcar Properties Limited | Real estate | 2019 |
| Redcar Property Services Ltd | Real estate | 2025 |
| Redcar Rocks Limited | Construction | 2019 |
| Redcar Rugby Union Football Club (Trading and Supporters Group) Limited | Arts & recreation | 2021 |
| Redcar Scaffolding Limited | Construction | 2014 |
| Redcar Shawarma Ltd | Hospitality | 2025 |
| Redcar Sports Bar & Grill Ltd | Hospitality | 2026 |
| Redcar Stray Developments Limited | Construction | 2019 |
| Redcar Tasty Limited | Hospitality | 2026 |
| Redcar Vets Limited | Professional & scientific | 2025 |
| Redcar Welding Ltd | Mining & quarrying | 2019 |
| Rediviva Limited | Manufacturing | 2018 |
| Rees-Davies Consultancy Limited | Energy | 2017 |
| Refresh Housing Limited | Real estate | 2022 |
| Refreshing Comms Ltd | Professional & scientific | 2024 |
| Regency Mansions Management Company Limited | Households | 1997 |
| Regsync Limited | Other services | 2024 |
| REH Completions & Engineering Services Ltd | Professional & scientific | 2025 |
| Remedy 150 Ltd | Information & communication | 2012 |
| Renewable Administration Services Ltd | Administrative & support | 2024 |
| Renewable Transport Fuel Association | Other services | 2020 |
| Reoc Ltd | Mining & quarrying | 2024 |
| Reside Away Lettings Ltd | Real estate | 2023 |
| Restoration Force Limited | Water & waste | 2007 |
| RFN Robinson Limited | Real estate | 2022 |
| RGB Services North East Ltd | Other services | 2019 |
| Rhys Whiteside Logistics Ltd | Transport & logistics | 2025 |
| Ribble GD Ltd | Manufacturing | 2011 |
| Richard J Knaggs & Co LLP | | 2009 |
| Richard of Impressions Limited | Other services | 2010 |
| Richardson Intelligent Systems Ltd | Information & communication | 2025 |
| Ridercraft Training & Consultancy Services Limited | Education | 2009 |
| Ridwan Engineering Services Limited | Professional & scientific | 2023 |
| Rise & Bloom Collective Limited | Real estate | 2025 |
| RJ Properties & Development Ltd | Real estate | 2019 |
| RJB Accounts Ltd | Professional & scientific | 2020 |
| RJW Digital Services Ltd | Information & communication | 2021 |
| Road Surfacing Limited | Construction | 2026 |
| ROB Russell Inspection Limited | Professional & scientific | 2012 |
| ROB Young Solutions Ltd | Construction | 2020 |
| Robburr AI Services Ltd | Manufacturing | 2025 |
| Robert Evenden Ltd | Construction | 2025 |
| Robert Scott Engineering Ltd | Professional & scientific | 2010 |
| ROBGB0 Ltd | Professional & scientific | 2026 |
| Robinson Piping Services Limited | Professional & scientific | 2019 |
| Robot Education Limited | Education | 2018 |
| Roisi Properties Ltd | Households | 2021 |
| Rope Access Maintenance Services Ltd | Professional & scientific | 2025 |
| Roscoe Kitchens & Joinery Limited | Construction | 2025 |
| Rose & Sons Photography Ltd | Professional & scientific | 2010 |
| Roseberry Electrical Ltd | Construction | 2025 |
| Roseberry Funeral Services Ltd | Other services | 2014 |
| Rothco Properties Ltd | Real estate | 2003 |
| Route 1 Coffee House C.I.C. | Health & social care | 2013 |
| RPK Electrical Limited | Professional & scientific | 2021 |
| RPK Engineering Solutions Limited | Professional & scientific | 2022 |
| RPK Property Solutions Limited | Real estate | 2021 |
| RS Property Barton Development Limited | Real estate | 2021 |
| RSC Property Services Ltd | Administrative & support | 2021 |
| RT Property Solutions Ltd | Real estate | 2023 |
| Rubber Duck Bathrooms Limited | Wholesale & retail | 2006 |
| Rubberduck Redcar Ltd | Wholesale & retail | 2026 |
| Ruby Nails Redcar Limited | Other services | 2023 |
| Rustcue Ltd | Extraterritorial | 2016 |
| Rutley Construction Ltd | Construction | 2026 |
| Ryan Family Lettings LLP | | 2021 |
| S Briggs Plumbing & Heating Services Limited | Construction | 2012 |
| S Dandy Engineering Limited | Administrative & support | 2014 |
| S Mccabe BIM Solutions Ltd | Professional & scientific | 2021 |
| S P Dane Limited | Professional & scientific | 2018 |
| S S Thompson Limited | Construction | 2014 |
| S&Msy Ltd | Wholesale & retail | 2025 |
| Sabic Innovative Plastics Limited | Wholesale & retail | 1969 |
| Sabic UK Petrochemicals Limited | Manufacturing | 1999 |
| Safer Work Group Limited | Education | 2017 |
| Safer Work Limited | Information & communication | 2017 |
| Saltscar Property Limited | Real estate | 2023 |
| Samuel Moore Roofing Ltd | Construction | 2020 |