| R & J Brooks Freeholds Limited | Real estate | 2015 |
| R & J Brooks Properties Ltd | Real estate | 2014 |
| R Cutting Ltd | Hospitality | 2022 |
| R R Rands Ltd | Wholesale & retail | 2021 |
| R. a. Materials Ltd | Other services | 2024 |
| R. ST Barth Limited | Wholesale & retail | 2016 |
| R. Thomas Computer Vision Ltd | Other services | 2023 |
| Radar Search Ltd | Administrative & support | 2024 |
| RAE James Recruitment Limited | Administrative & support | 2026 |
| Railway House Developments Ltd | Construction | 2022 |
| Rainbow (UK) Limited | Other services | 2011 |
| Rainbow Connected Limited | Other services | 2011 |
| Ratio 1.5 LLP | | 2019 |
| Ratio Onepointfive Limited | Construction | 2024 |
| Ravendran Consultancy (Ravcon) Ltd | Professional & scientific | 2011 |
| Rawel Limited | Construction | 2021 |
| RAY Winstone Limited | Arts & recreation | 2007 |
| RB ADR Driver Services Ltd | Transport & logistics | 2024 |
| RB Cabling Solutions Ltd | Information & communication | 2018 |
| RBN Construction and Management Ltd | Construction | 2011 |
| Rchand Estates Ltd | Real estate | 2019 |
| RD Accountants Limited | Professional & scientific | 2020 |
| Rdkf Limited | Professional & scientific | 2016 |
| RE Budd Investments Ltd | Real estate | 2024 |
| Reading Books Limited | Education | 2018 |
| Real Cool Traders Ltd | Other services | 2014 |
| Real MED Property Limited | Real estate | 2011 |
| Real SOL Property Limited | Real estate | 2018 |
| Recover-Re Limited | Administrative & support | 2010 |
| Recovero.Me Ltd | Health & social care | 2025 |
| Redshark Limited | Information & communication | 2003 |
| Refresh Support Services Ltd | Administrative & support | 2020 |
| Regal International Investment Properties Limited | Real estate | 2006 |
| Regency Lodge (Buckhurst Hill) RTM Company Limited | Households | 2012 |
| Regent FM Limited | Administrative & support | 2017 |
| Regent Global College Ltd | Education | 2018 |
| Regent Properties Developer Ltd | Real estate | 2023 |
| REM Wellbeing Ltd | Other services | 2021 |
| REN Caring Ltd | Health & social care | 2016 |
| Repose Extra Ltd | Arts & recreation | 2023 |
| Repose Health and Fitness Ltd | Health & social care | 2023 |
| Restaurant Paradise Limited | Hospitality | 2015 |
| Retreats With Impact Ltd | Other services | 2025 |
| Retrofit & Coordination Services Ltd | Construction | 2023 |
| Review My Rent Consultants Limited | Other services | 2026 |
| RGB Films Ltd | Information & communication | 2019 |
| Rhe;Hab Ltd | Other services | 2024 |
| Rida & Co. Ltd | Hospitality | 2026 |
| Ridexec Ltd | Transport & logistics | 2024 |
| Ridez Ltd | Transport & logistics | 2025 |
| Ridgeway Contract Solutions Ltd | Construction | 2022 |
| Ridley Harrison Limited | Professional & scientific | 2026 |
| Risk Free Solutions Ltd | Information & communication | 2018 |
| Rizken Ltd | Information & communication | 2025 |
| RO - AL Construction Ltd | Construction | 2016 |
| Road & Traffic Tech Ltd | Water & waste | 2010 |
| Roamguard Ltd | Wholesale & retail | 2025 |
| Roaming Goose Limited | Professional & scientific | 2018 |
| ROB Dellow Safety Ltd | Information & communication | 2025 |
| Robart House Property Limited | Real estate | 2003 |
| Robert Jacko Ltd | Construction | 2026 |
| Robert Owen Trade & Consultancy Ltd | Transport & logistics | 2017 |
| Robin Poppy Limited | Other services | 2019 |
| Rohan Property Services Limited | Real estate | 2010 |
| ROK Projects Limited | Real estate | 2019 |
| Roman Lodge RTM Company Ltd | Households | 2017 |
| Rosebush 61 Ltd | Construction | 2017 |
| Rosewood Property Solutions Ltd | Real estate | 2021 |
| Rosey LEA Ltd | Hospitality | 2012 |
| Rosey LEA South Ltd | Hospitality | 2025 |
| Rosey LEA Tea Ltd | Wholesale & retail | 2020 |
| Rowditch News Agency Ltd | Information & communication | 2023 |
| RP DS (London) Ltd | Health & social care | 2023 |
| RPG Enterprises Ltd | Extraterritorial | 2004 |
| RPG Enterprises One Ltd | Extraterritorial | 2018 |
| RR Building Limited | Construction | 2025 |
| RS Properties Maintenance Limited | Other services | 2019 |
| RSA Structural Design Ltd | Professional & scientific | 2018 |
| RTJ Developments Ltd | Construction | 2019 |
| RUI KAI Ltd | Information & communication | 2025 |
| Run KIT FOX Ltd | Wholesale & retail | 2025 |
| Russell West Ltd | Manufacturing | 2019 |
| RW Golbourn Limited | Real estate | 2010 |
| RYC Consulting Ltd | Information & communication | 2018 |
| RZR3 Limited | Real estate | 2025 |
| S & J Properties (London) Limited | Real estate | 1998 |
| S & R Brothers Ltd | Wholesale & retail | 2026 |
| S M Anaesthetics Ltd | Health & social care | 2017 |
| S Muncey Builders Limited | Construction | 2022 |
| S R a Property Investments Ltd | Real estate | 2019 |
| S Rothstein Ltd | Professional & scientific | 2014 |
| S Solid Builder Ltd | Construction | 2023 |
| S T Bennett & Co Limited | Professional & scientific | 2026 |
| S&S Developers Ltd | Construction | 2025 |
| S&T Goods Ltd | Wholesale & retail | 2026 |
| S. J. Moore Ltd | Real estate | 1986 |
| S.E.B. Developments Limited | Construction | 2017 |
| Salca Construction Ltd | Construction | 2025 |
| Salire Sempre Limited | Other services | 2008 |
| Sammy Group Contractors Ltd | Construction | 2022 |