| Rockall Engineering Services Ltd. | Professional & scientific | 2012 |
| Rocket Accountants Limited | Professional & scientific | 2024 |
| Rocket Advertising Limited | Professional & scientific | 2025 |
| Rocket Influence Limited | Professional & scientific | 2026 |
| Rocket Self Storage Ltd | Real estate | 2024 |
| Rocket Spin Ltd | Other services | 2024 |
| Rocketseed (United Kingdom) Limited | Information & communication | 2001 |
| Rockwood Residence Ltd | Real estate | 2019 |
| Rodruss.Com Ltd | Information & communication | 2023 |
| ROE Environmental Ltd | Water & waste | 2014 |
| Roesdon Ltd | Wholesale & retail | 2026 |
| Rogers Refurbishments Ltd | Construction | 2013 |
| Rollin Stock Hair & Beauty Supplies Limited | Wholesale & retail | 1995 |
| Rollinservices Limited | Information & communication | 2025 |
| Rominar (London) Limited | Construction | 2002 |
| Rominar (U.K.) Limited | Construction | 1983 |
| Romulus Data Systems Ltd | Information & communication | 2010 |
| Roofline Roofing & Cladding Limited | Construction | 2015 |
| Roofworld Limited | Extraterritorial | 2013 |
| Root Electrical Ltd | Construction | 2016 |
| Roothings Builders & Decorators Limited | Construction | 2000 |
| Ropetech Limited | Construction | 2024 |
| Rorya Ltd | Transport & logistics | 2023 |
| Rosa Group Ltd | Administrative & support | 2015 |
| Rose Property Inventories Ltd | Real estate | 2023 |
| Roseberry Kare Limited | Administrative & support | 2023 |
| Rosie & Gym Ltd | Arts & recreation | 2026 |
| Rosina MOT Centre Limited | Other services | 2010 |
| Ross James Electrical Limited | Construction | 2011 |
| Ross Smith Design Ltd | Manufacturing | 2024 |
| Rossco Site Services Limited | Manufacturing | 2012 |
| Rosselsden Homes Ltd | Real estate | 2023 |
| Rossi on Sea Ltd | Hospitality | 2020 |
| Round Medical Limited | Health & social care | 2016 |
| Route 610 Limited | Administrative & support | 2022 |
| Rowhedge Restorations Limited | Construction | 2014 |
| Royal Bites Peri Peri Ltd | Hospitality | 2025 |
| RP Legal Ltd | Professional & scientific | 2022 |
| RS Automotive Core Limited | Wholesale & retail | 2014 |
| RS Cleaning Machines Limited | Wholesale & retail | 2023 |
| RS Commercial & Auto Electrics Ltd | Wholesale & retail | 2021 |
| RS Integrations Limited | Administrative & support | 2017 |
| RSH Electrical Limited | Construction | 2016 |
| RSR Insights Ltd | Professional & scientific | 2024 |
| RSW Property Group Ltd | Real estate | 2021 |
| RTC Support Services Ltd | Health & social care | 2018 |
| Rules of Engagement Limited | Arts & recreation | 2013 |
| Runroosterchicken Limited | Hospitality | 2026 |
| Runwood (NI) Limited | Health & social care | 2020 |
| Ruskin Storage Ltd | Real estate | 2017 |
| Ruva Skincare Ltd | Wholesale & retail | 2022 |
| RW Leisure and Glamping Limited | Hospitality | 2017 |
| RWB Property Group Ltd | Real estate | 2025 |
| RX Contract Management Limited | Administrative & support | 2015 |
| Ryben Building Ltd | Construction | 2026 |
| Ryben Properties Ltd | Real estate | 2025 |
| Rydan Mechanical Services Limited | Construction | 1999 |
| Ryders PM Ltd | Real estate | 2023 |
| S & L Property Maintenace Ltd | Construction | 2026 |
| S & L Trooms Ltd | Hospitality | 2023 |
| S & R Duke Ltd | Administrative & support | 1998 |
| S & S Imaging Ltd | Health & social care | 2021 |
| S & T Insurance Services Limited | Financial services | 2008 |
| S a Technology Limited | Information & communication | 2010 |
| S B Management Consulting Limited | Professional & scientific | 2018 |
| S C Devlin Accountancy Ltd | Professional & scientific | 2011 |
| S Chana Consulting Ltd | Health & social care | 2023 |
| S Day Interiors Limited | Construction | 2016 |
| S E Land Company Limited | Real estate | 2024 |
| S E Repairs Limited | Construction | 2024 |
| S Francis Limited | Construction | 2022 |
| S G H Autos Limited | Wholesale & retail | 2013 |
| S Gold Services Ltd | Professional & scientific | 2019 |
| S L Daly Ltd | Health & social care | 2023 |
| S R LEE Interiors Ltd | Construction | 2026 |
| S W Heating Limited | Construction | 2016 |
| S W Mcgee Plumbing & Heating Ltd | Construction | 2026 |
| S&G Property Acquisitions Ltd | Real estate | 2018 |
| S&L Drylining Ltd | Construction | 2025 |
| S&L GAS and Heating Limited | Construction | 2011 |
| S&N Retail 1 Ltd | Wholesale & retail | 2024 |
| S&S Quick Limited | Wholesale & retail | 2016 |
| S-Tec Group Ltd | Construction | 2015 |
| S.A.T. Ingredients Limited | Administrative & support | 2003 |
| S.A.Y Plumbing and Heating Ltd | Construction | 2021 |
| S.E.E. Repairs Ltd | Wholesale & retail | 2018 |
| S.J. Webb & Co. Limited | Construction | 1980 |
| S.J.T Management & Sales Ltd | Administrative & support | 2010 |
| S.L White & Sons Group Ltd | Construction | 2018 |
| S.Stibbards & Sons Limited | Other services | 1941 |
| S6 GAS Ltd | Information & communication | 2021 |
| SA Grounds Maintenance Limited | Transport & logistics | 2024 |
| SA Services (Civils & Groundworks) Ltd | Construction | 2023 |
| SAA Integrations Ltd | Administrative & support | 2018 |
| Saab and Vauxhall Independent Specialists Limited | Wholesale & retail | 2009 |
| SAB Space Limited | Construction | 2023 |
| Safe Protec Plus Ltd | Administrative & support | 2026 |
| Safeharbour Seniors Ltd | Health & social care | 2026 |
| Saffron Holdings UK Ltd | Real estate | 2022 |
| Sagacity Information Services Ltd | Information & communication | 2022 |