| Rubi & I1G Investments Ltd | Construction | 2023 |
| Rubiq Limited | Extraterritorial | 2014 |
| Ruby 2 Ashington Limited | Hospitality | 2021 |
| Ruby North East Ltd | Hospitality | 2020 |
| Ruby Red Ltd | Financial services | 2025 |
| Ruby Shah Investments Limited | Real estate | 2013 |
| Ruby Staffordshire Limited | Hospitality | 2016 |
| Ruby Tuesday Grooming Ltd | Other services | 2018 |
| Rubyani Limited | Health & social care | 2022 |
| Rudi's Hairdressing Limited | Other services | 2013 |
| Ruen Thai Massage & Spa Ltd | Other services | 2020 |
| Ruff Holdings Ltd | Financial services | 2025 |
| Ruffels Clothing Ltd | Wholesale & retail | 2025 |
| Ruffles Clothing Ltd | Wholesale & retail | 2022 |
| Rugby Minis NCL Ltd | Education | 2023 |
| Rugglers Ltd | Hospitality | 2023 |
| Ruha Developments Limited | Real estate | 2024 |
| Ruhel & Son's Ltd | Real estate | 2022 |
| Ruktan Holdings Ltd | Financial services | 2023 |
| Rulu Living Co. Ltd | Real estate | 2025 |
| RUM Rangoon Limited | Other services | 2018 |
| Ruman Residentials Ltd | Hospitality | 2022 |
| Rumi Property Development Ltd | Real estate | 2019 |
| Rumour (LOW Fell) Ltd | Other services | 2015 |
| Run Limited | Real estate | 2017 |
| Run Nation Events Limited | Arts & recreation | 2013 |
| Running Optimum Limited | Wholesale & retail | 2018 |
| Runnymede Road Management Limited | Real estate | 2015 |
| RUR Limited | Health & social care | 2014 |
| Rural Asset Management Limited | Professional & scientific | 2025 |
| Rush Slowly Ltd | Wholesale & retail | 2023 |
| Rushbrocks Holdings Limited | Financial services | 2023 |
| Rushbrocks Limited | Real estate | 1992 |
| Rushmore FOX LLP | | 2025 |
| Russ Youmans Joinery Limited | Construction | 2012 |
| Russell Sewell Limited | Professional & scientific | 2020 |
| Russells Supplies Limited | Wholesale & retail | 1942 |
| Russoux Ltd | Extraterritorial | 2025 |
| Rusty Restorations Limited | Construction | 2024 |
| Rutherford Hughes Limited | Financial services | 2016 |
| Rutherford Property Services Ltd | Real estate | 2012 |
| Ruthven Court Residents Association Limited | Households | 1986 |
| Ruware Ltd Ltd | Manufacturing | 2025 |
| RW Developments BGL Ltd | Administrative & support | 2024 |
| Rwalker TP Limited | Construction | 2024 |
| RWC Energy Ltd | Construction | 2025 |
| Rwjb Properties Ltd | Real estate | 2023 |
| RWN Blade Repair Ltd | Construction | 2023 |
| RWO Associates (Geotechnical) Limited | Professional & scientific | 2015 |
| RWO Associates Ltd | Professional & scientific | 2010 |
| RWO Holdings Limited | Professional & scientific | 2016 |
| RWO MC Limited | Professional & scientific | 2016 |
| RWS Web Solutions Ltd | Information & communication | 2004 |
| Ryam Beauty Dome Ltd | Wholesale & retail | 2024 |
| Ryan (U.K.) Limited | Professional & scientific | 1942 |
| Ryan Hooper Ltd | Arts & recreation | 2012 |
| Ryan Industrial Fuels Limited | Professional & scientific | 1954 |
| Ryan Veal Psychology Ltd | Health & social care | 2026 |
| Rybak Construction Ltd | Construction | 2024 |
| Ryde Taxis Ltd | Transport & logistics | 2026 |
| Ryder 2025 Trustee Limited | Professional & scientific | 2025 |
| Ryder Architecture Limited | Professional & scientific | 1984 |
| Ryecroft Glenton Audit Services Limited | Professional & scientific | 1999 |
| Ryecroft Glenton LLP | | 2026 |
| Ryecroft Holdings Limited | Financial services | 2019 |
| Ryecroft Residential Apartments Limited | Households | 2020 |
| Ryecroft, Glenton Services Limited | Professional & scientific | 1974 |
| RYO Advisory Limited | Professional & scientific | 2022 |
| RYS Asset Investment Ltd | Real estate | 2021 |
| RYS Investments LLP | | 2015 |
| Ryton Haugh Ltd | Construction | 2022 |
| Ryton Nails & Beauty Ltd | Other services | 2025 |
| Réseaulabo Limited | Professional & scientific | 2025 |
| S & B Drapers Limited | Wholesale & retail | 2000 |
| S & B Leisure Ltd | Hospitality | 2015 |
| S & B Shutters Ltd | Construction | 2024 |
| S & K Fastfoods Limited | Hospitality | 2020 |
| S & L (NE) Ltd | Hospitality | 2019 |
| S & N Anand Ltd | Real estate | 2022 |
| S & N Kaura Properties LLP | | 2023 |
| S & R Camping & Glamping Limited | Water & waste | 2021 |
| S & S Group (NE) Ltd | Hospitality | 2026 |
| S & S Taribagil Ltd | Health & social care | 2025 |
| S & S Vantage Ltd | Construction | 2026 |
| S & Z Education Services Limited | Education | 2023 |
| S a Garage Services Swalwell Ltd | Wholesale & retail | 2026 |
| S and J Taxi Hire Limited | Administrative & support | 2008 |
| S and M Hussain Properties Ltd | Real estate | 2020 |
| S B Developments (North East) Ltd | Other services | 2012 |
| S C Coatings & Blasting Ltd | Manufacturing | 2019 |
| S Caygill Ltd | Professional & scientific | 2019 |
| S D Maudling Ltd | Construction | 2024 |
| S D Wallace Local Crew Limited | Arts & recreation | 2008 |
| S Douglas Roofing Ltd | Construction | 2018 |
| S E (NE) Electrical Ltd | Construction | 2016 |
| S Eldabe Limited | Health & social care | 2013 |
| S G G Property Developments (North East) Limited | Hospitality | 2014 |
| S G Phillips Ltd | Construction | 2016 |
| S Harford & Co Limited | Administrative & support | 2024 |
| S K Chopra Ltd | Transport & logistics | 2003 |