| Rush Poker Limited | Information & communication | 2010 |
| Rushden Handmade and Vintage Events Ltd | Real estate | 2020 |
| Rushmere Properties Limited | Real estate | 1995 |
| Russ Properties Ltd | Real estate | 2023 |
| Russel Wells Builders Ltd | Construction | 2017 |
| Russell Goodall Limited | Construction | 2006 |
| Russell Hinton Ltd | Professional & scientific | 2026 |
| Russell Hitchcock Ltd | Real estate | 2025 |
| Russell HR Consulting Limited | Professional & scientific | 2009 |
| Russell Property Limited | Real estate | 2017 |
| Russell Software Design Limited | Information & communication | 1994 |
| Russell-Waters Limited | Real estate | 2019 |
| Russetts Developments Limited | Manufacturing | 1982 |
| Rustytail Ltd | Wholesale & retail | 2016 |
| Ruth Wyatt Saddlery Limited | Other services | 2022 |
| Rutherfords (Aylesbury) Limited | Professional & scientific | 2011 |
| Rutland Property Mews Ltd | Construction | 2018 |
| Rutland Sports Limited | Wholesale & retail | 2013 |
| Ruut Ltd | Manufacturing | 2019 |
| RV Refinishers Ltd | Construction | 2014 |
| Rvtj Solutions Ltd | Information & communication | 2025 |
| RW Johnson Ltd | Professional & scientific | 2026 |
| RWB Consultancy Limited | Professional & scientific | 2016 |
| RWB Investments Limited | Wholesale & retail | 2016 |
| Rwdi Anemos Limited | Professional & scientific | 2001 |
| RWM Transport Ltd | Transport & logistics | 2025 |
| RWS Global Sports UK Limited | Arts & recreation | 2002 |
| RWS Global UK Holdings Limited | Professional & scientific | 2014 |
| RWS Global UK Limited | Arts & recreation | 2000 |
| RY Neurodiagnostics Limited | Health & social care | 2026 |
| Ryan DEV (Estates) Ltd | Real estate | 2023 |
| Ryan Howard Trading Ltd | Wholesale & retail | 2025 |
| Ryan JAY Ltd | Construction | 2015 |
| Ryan Technologies Limited | Professional & scientific | 2017 |
| Rybo Ltd | Wholesale & retail | 2023 |
| Ryder International UK Holdings LP | | 2018 |
| Ryder Limited | Real estate | 1971 |
| Ryder Pension Fund Limited | Professional & scientific | 1949 |
| Ryder System Holdings (UK) Limited | Professional & scientific | 1988 |
| RYE Electrical Ltd | Construction | 2019 |
| Ryeland Toolmakers Limited | Extraterritorial | 1984 |
| Rylox Ltd | Information & communication | 2024 |
| RYO Limited | Health & social care | 2015 |
| RZA Keys Limited | Real estate | 2025 |
| S & B Supermarket LLP | | 2010 |
| S & CJ Barnes Limited | Real estate | 2021 |
| S & F Trading UK Ltd | Wholesale & retail | 2026 |
| S & G Cleaning Services Ltd | Administrative & support | 2024 |
| S & G Fasteners Limited | Wholesale & retail | 2005 |
| S & J Fuels Limited | Wholesale & retail | 2025 |
| S & J K Property Limited Liability Partnership | | 2006 |
| S & J Spice Ltd | Hospitality | 2025 |
| S & M Cleaning Services Ltd | Administrative & support | 2024 |
| S & M Consultation Ltd | Information & communication | 2023 |
| S & P Management and Educational Services Ltd | Professional & scientific | 2024 |
| S & S Hauliers Limited | Transport & logistics | 2012 |
| S and H GAS Limited | Construction | 2021 |
| S and Z Moters Limited | Wholesale & retail | 2024 |
| S Barber Shops Ltd | Other services | 2022 |
| S Bennett Project Consulting Limited | Professional & scientific | 2022 |
| S Burns Administrative Services Ltd | Administrative & support | 2026 |
| S C W Tyres Ltd | Wholesale & retail | 2014 |
| S Capital Ventures Ltd | Professional & scientific | 2021 |
| S Childs Hire Ltd | Administrative & support | 2026 |
| S Childs Property Management Limited | Real estate | 2019 |
| S Childs Services Ltd | Administrative & support | 2025 |
| S Crompton Services Ltd | Wholesale & retail | 2024 |
| S E I (Maintenance) Ltd | Construction | 2013 |
| S E Maintenance Ltd | Construction | 2019 |
| S F Beauty Supplies (UK) Limited | Wholesale & retail | 2007 |
| S G Radiology and Associates Limited | Health & social care | 2011 |
| S G Smith Holdings Limited | Professional & scientific | 2015 |
| S G Smith Trade Parts Ltd | Wholesale & retail | 1984 |
| S Gorsi Ltd | Health & social care | 2019 |
| S Iacob Limited | Transport & logistics | 2018 |
| S J & E Contracts Limited | Construction | 2017 |
| S J Brookes Transport Limited | Transport & logistics | 2008 |
| S J C Property Group Ltd | Hospitality | 2025 |
| S J H Machinery Limited | Wholesale & retail | 2008 |
| S J I Building Maintenance Limited | Construction | 2007 |
| S K R Engineering Ltd. | Manufacturing | 2009 |
| S K Wright Building Contractors Limited | Construction | 2001 |
| S Line Embroidery Ltd | Manufacturing | 2026 |
| S M Canzio & Co. Limited | Health & social care | 1997 |
| S M Consultancy (MK) Limited | Real estate | 2007 |
| S M D Services Limited | Professional & scientific | 2004 |
| S O L (NP) Ltd | Construction | 2020 |
| S O L Services Limited | Administrative & support | 2003 |
| S O S (U.K.) Limited | Professional & scientific | 1992 |
| S P Two Ltd | Information & communication | 2005 |
| S Pharma Private Limited | Professional & scientific | 2025 |
| S Property Ventures Ltd | Real estate | 2020 |
| S R Banfield Inspection Limited | Professional & scientific | 2017 |
| S R Belgrove Limited | Construction | 2013 |
| S S F Engineering Ltd. | Manufacturing | 2011 |
| S S Global Foods Limited | Wholesale & retail | 2025 |
| S Samaz Limited | Other services | 2014 |
| S Smillie Limited | Construction | 2010 |
| S T P Consultants Limited | Information & communication | 2016 |
| S Vendy Ltd | Arts & recreation | 2021 |