| Robyland Limited | Construction | 1976 |
| Roch 2 Limited | Health & social care | 2012 |
| Rock & Co Cambridge Limited | Manufacturing | 2022 |
| Rock & Co. Granite Limited | Manufacturing | 2008 |
| Rock Assets Limited | Administrative & support | 2011 |
| Rock Glazing Limited | Construction | 2018 |
| Rock Paper Holdings Limited | Financial services | 2021 |
| Rock Plastics Group Ltd | Extraterritorial | 2020 |
| Rock Plastics Ltd | Construction | 2009 |
| Rocker Project Management Limited | Construction | 2009 |
| Rockhopper Healthcare Ltd | Other services | 2018 |
| Rockitfish Ltd | Administrative & support | 2014 |
| Rocksand Computers Limited | Information & communication | 1986 |
| Roebuck (London) Ltd | Real estate | 2017 |
| Roger That 2 Limited | Administrative & support | 2017 |
| Roger That 3 Limited | Administrative & support | 2017 |
| Roger That 4 Limited | Administrative & support | 2017 |
| Roger That Limited | Administrative & support | 2010 |
| Roland Jackson Consulting Limited | Professional & scientific | 2022 |
| Rollins & Sons (London) Limited | Wholesale & retail | 1924 |
| Rollins Bulldog Tools Limited | Manufacturing | 2003 |
| Ropemakers Fields (Limehouse) Management Company Limited | Households | 1995 |
| Rose Decorating & Property Maintenance Ltd | Construction | 2015 |
| Rosetree Cleaning and Gardening Limited | Administrative & support | 2022 |
| Rosetree Developments Limited | Households | 2019 |
| Rosetree Estates Limited | Real estate | 2015 |
| Rosetree Facilities Management Limited | Administrative & support | 2016 |
| Rosetree Group Ltd | Financial services | 2021 |
| Rosewood Recruitment Limited | Administrative & support | 2022 |
| Rosie Aldridge Ltd | Arts & recreation | 2022 |
| Ross Cars Limited | Wholesale & retail | 2022 |
| Ross Properties Consultancy Limited | Real estate | 2022 |
| Rosslyn Court (Beckenham) Management Company Limited | Hospitality | 1995 |
| Rosstay Farms Limited | Agriculture & fishing | 2011 |
| Rothery Logistics Limited | Administrative & support | 2022 |
| Rothschild & Bickers Limited | Manufacturing | 2013 |
| Rotte Ltd | Professional & scientific | 2022 |
| Round Window Media Ltd | Information & communication | 2007 |
| Rowley Developments Limited | Construction | 2024 |
| Royston (2013) Limited | Professional & scientific | 2013 |
| RR SFX Ltd | Professional & scientific | 2022 |
| RRD Properties Limited | Real estate | 2017 |
| RRR Pilates Limited | Health & social care | 2025 |
| RSB 2009 LLP | | 2009 |
| RSB Developments (Orwell) Limited | Administrative & support | 2021 |
| RSB Farms Ltd | Agriculture & fishing | 2018 |
| RSB UK Limited | Transport & logistics | 2008 |
| RSR Prestige Limited | Wholesale & retail | 2024 |
| Ruay ROT (Hertford) Limited | Hospitality | 2023 |
| Rubber Heart Ltd | Professional & scientific | 2019 |
| Rubix Surveyors Ltd | Professional & scientific | 2021 |
| Ruby's Room Limited | Other services | 2023 |
| Rule One Fire Limited | Administrative & support | 2026 |
| Rumble Post Ltd | Information & communication | 2024 |
| Rumotom Limited | Administrative & support | 2011 |
| Run Stark Limited | Other services | 2024 |
| Runworx Ltd | Education | 2025 |
| Russell Ballard Limited | Arts & recreation | 1978 |
| Rutledge Property Management Limited | Real estate | 2018 |
| RVS Iglobal Limited | Information & communication | 2022 |
| RVS IT Limited | Information & communication | 2016 |
| RVS Property Investments Limited | Real estate | 2020 |
| RVS Restaurants Limited | Hospitality | 2019 |
| Rvtv Security Group Ltd | Administrative & support | 2021 |
| Ryepro Limited | Wholesale & retail | 2021 |
| S & N Contracts Limited | Construction | 2014 |
| S C Investments (Herts) Limited | Extraterritorial | 2014 |
| S Eden Glazing Ltd | Construction | 2018 |
| S H Business Developments Limited | Administrative & support | 2022 |
| S Humphrey Roofing Services Limited | Construction | 2022 |
| S I Nicholls Properties Ltd | Real estate | 2025 |
| S Rolfe Roofing Limited | Construction | 2018 |
| S&D Inn IT Limited | Hospitality | 2015 |
| S&S Hire and Store Limited | Wholesale & retail | 2023 |
| S. a. Jamali & Co UK Limited | Professional & scientific | 2011 |
| S.A (T/A Pizza Go Go) Ltd | Hospitality | 2015 |
| S.D.C 123 Ltd | Construction | 2025 |
| S3 Associates Limited | Professional & scientific | 2005 |
| Saaa Capital Limited | Administrative & support | 2013 |
| Sacha Bright Ltd | Information & communication | 2022 |
| SAD Metals Ltd | Transport & logistics | 2015 |
| Safety Train Services Limited | Health & social care | 2023 |
| Sage Medical (UK) Ltd | Health & social care | 2014 |
| SAI Eterna Ltd | Real estate | 2025 |
| Salaam Wholesale Ltd | Wholesale & retail | 2025 |
| Salb Property Limited | Real estate | 2025 |
| Salcon Investments Limited | Construction | 1984 |
| Salimi Property LLP | | 2025 |
| Salmon White Music Ltd | Information & communication | 2020 |
| SAM Beast Consulting Ltd | Information & communication | 2018 |
| SAM Owen Property Developments Limited | Construction | 2023 |
| Samantha Funnell Limited | Professional & scientific | 2014 |
| Samelex Limited | Professional & scientific | 2024 |
| Samr Enterprises Ltd | Real estate | 2025 |
| Sandbox Consulting Ltd | Professional & scientific | 2021 |
| Saracen Investments Limited | Real estate | 1988 |
| Sarvio Holdings Limited | Professional & scientific | 2026 |
| Sasco (Aylesford) Limited | Extraterritorial | 1995 |
| Sasco Sauces Limited | Manufacturing | 2002 |
| Sasg Limited | Construction | 2023 |