| RLC Environmental Ltd | Water & waste | 2025 |
| RM Kamal Invest Limited | Real estate | 2022 |
| Roar Real Estate Ltd | Hospitality | 2020 |
| Robin Housing Limited | Real estate | 2026 |
| Robin Invest Ltd | Professional & scientific | 2025 |
| Robsam Ltd | Information & communication | 2026 |
| Robustus Sweden Ltd | Real estate | 2025 |
| Robynn Investments Ltd | Real estate | 2022 |
| ROC & Rock Business Consultants Limited | Professional & scientific | 2025 |
| ROC Aerial Solutions Ltd | Professional & scientific | 2025 |
| Rock of Ages Care Limited | Health & social care | 2016 |
| Rockdale Property Ltd | Real estate | 2026 |
| Rocket Dog Design Limited | Information & communication | 2026 |
| Rockfort Capital Ltd | Professional & scientific | 2026 |
| Rocks Real Estate Ltd | Real estate | 2024 |
| Rockstar Property Investments Ltd | Real estate | 2025 |
| Rockstone Property Ltd | Real estate | 2021 |
| Rodi and Judi Unisex Barber Ltd | Other services | 2025 |
| Rohrhuber Asset Management Ltd | Professional & scientific | 2023 |
| Rojago Group Ltd | Real estate | 2025 |
| Roni Urban Properties Ltd | Real estate | 2025 |
| ROOM4MORE Ltd | Real estate | 2025 |
| Roomcraft Limited | Construction | 1972 |
| Rosa Investments Limited | Real estate | 2019 |
| Rosebuds Childcare Limited | Education | 2004 |
| Roses Property Ltd | Extraterritorial | 2021 |
| Rosyc Ventures Ltd | Real estate | 2019 |
| Rows Tender Group Ltd | Financial services | 2023 |
| Roxydog Productions Ltd | Information & communication | 2023 |
| ROY Consultants Limited | Information & communication | 2007 |
| Royal Holloway Enterprise Limited | Information & communication | 1991 |
| Royal Holloway, University of London Students’ Union | Other services | 2025 |
| Royale European Coaches Limited | Transport & logistics | 2003 |
| Rozenbeek Beeren Investments Ltd | Real estate | 2026 |
| RS and DM Properties Limited | Real estate | 2016 |
| RS Property Surveys Limited | Professional & scientific | 2019 |
| RS Scaling Ltd | Professional & scientific | 2025 |
| RTG Dealworks Ltd | Real estate | 2026 |
| RTJ Services Limited | Other services | 2022 |
| Rubicon Software Limited | Information & communication | 1990 |
| Ruby Wines Ltd | Wholesale & retail | 2020 |
| Rudius Ltd | Professional & scientific | 1989 |
| Rugged Worx Ltd | Wholesale & retail | 2022 |
| Rumbo Careers Limited | Information & communication | 2026 |
| Runnymede Carpet and Flooring Limited | Wholesale & retail | 2020 |
| Runnymede Consulting Associates Ltd | Real estate | 2012 |
| Runnymede Contracts Ltd | Administrative & support | 2022 |
| Runnymede Freight & Logistics Ltd | Transport & logistics | 2023 |
| Runnymede Plant Services Ltd | Professional & scientific | 2026 |
| Runnymede Property Services Limited | Real estate | 2021 |
| Ruskin Holdings Limited | Extraterritorial | 2019 |
| Rustin Coffee Limited | Hospitality | 2014 |
| Ruthven Limited | Real estate | 1998 |
| Rutland Homes and Development Ltd | Real estate | 2025 |
| RW Lunar Solutions Ltd | Professional & scientific | 2024 |
| Ryddid Properties Ltd | Real estate | 2021 |
| Ryden Properties Ltd | Real estate | 2026 |
| S & J Management Investment Ltd | Professional & scientific | 2017 |
| S & P Sharma Investments Ltd | Real estate | 2018 |
| S D S Trading Applications Limited | Information & communication | 2002 |
| S.H.B. Hire Limited | Administrative & support | 1978 |
| S.W.A.T. Building Ltd | Construction | 2023 |
| S54TECH Ltd | Information & communication | 2014 |
| SA & RE Stiftung Ltd | Professional & scientific | 2023 |
| Sabater Moegelin Ltd | Other services | 2024 |
| Sabe Living Group Ltd | Financial services | 2025 |
| Sabe Living Ltd | Real estate | 2026 |
| Sacotra Ltd | Other services | 2024 |
| Saddleworth Consulting Limited | Professional & scientific | 2011 |
| Saffron a Ltd | Real estate | 2026 |
| Sagar Sons & Sons Ltd | Wholesale & retail | 2024 |
| Sagris Capital Ltd | Professional & scientific | 2022 |
| Saii RAM Limited | Wholesale & retail | 2019 |
| Sail Croatia Adventures Limited | Administrative & support | 2005 |
| Sail Croatia Limited | Administrative & support | 2014 |
| Salaca Management Services LLP | | 2012 |
| Salvia Trust Ltd | Health & social care | 2025 |
| Sambridge Properties Ltd | Real estate | 2021 |
| Sambridge Stays Ltd | Hospitality | 2021 |
| Samic Builders Merchants Limited | Professional & scientific | 1946 |
| Samskara (UK) Limited | Professional & scientific | 1998 |
| SAN Trading Limited | Extraterritorial | 2009 |
| Sandbox 3D Ltd | Manufacturing | 2025 |
| Sandford Freight (U.K.) Limited | Administrative & support | 1998 |
| Sandford Logistics (UK) Limited | Extraterritorial | 2007 |
| Sangelov Ltd | Transport & logistics | 2019 |
| Saqar Trading Company Ltd | Wholesale & retail | 2022 |
| Sarah Legge Photography Ltd | Professional & scientific | 2014 |
| Sarah Whittington Ltd | Transport & logistics | 2016 |
| Sarteso Property Ltd | Real estate | 2022 |
| Sartorex Group Limited | Financial services | 2016 |
| Satallite Enterprises Ltd | Wholesale & retail | 2024 |
| Save Light Ltd | Wholesale & retail | 2011 |
| Savill Flooring Limited | Wholesale & retail | 2002 |
| Savill Mews Residents' Company Limited | Real estate | 2002 |
| SB Corporate Services PLC | Professional & scientific | 2022 |
| SBH Heart and Hope Ltd | Other services | 2023 |
| SBW International Ltd | Other services | 2024 |
| Schuring Investments UK Ltd | Real estate | 2025 |
| Science Circus Ltd | Education | 2026 |