| RS Homes Hounslow Ltd | Real estate | 2023 |
| RS Homes Limited | Real estate | 2011 |
| RS Parivar Limited | Real estate | 2024 |
| RS Premium Drinks Ltd | Wholesale & retail | 2025 |
| RS Solutions Consultants Ltd | Other services | 2010 |
| RS Strategic Property Ltd | Real estate | 2025 |
| RS Trader Management Ltd | Real estate | 2018 |
| RS1 Holdings Limited | Professional & scientific | 2026 |
| RS2 Contracts Ltd | Construction | 2025 |
| RS22 Consulting Ltd | Professional & scientific | 2023 |
| RSA Productions Ltd | Information & communication | 2024 |
| Rscp Hospitality Ltd | Hospitality | 2025 |
| RSD Investments & Holdings Ltd | Real estate | 2020 |
| Rsgn Consultants Ltd | Professional & scientific | 2017 |
| RSJ Building Ltd | Construction | 2022 |
| Rsjp Properties Ltd | Real estate | 2018 |
| Rsjp Swanley Ltd | Construction | 2024 |
| RSK Music UK Ltd | Education | 2024 |
| Rskp Management Ltd | Administrative & support | 2024 |
| RSL Electronics Ltd | Extraterritorial | 2014 |
| RSM Capital Limited | Financial services | 2009 |
| RSM Estates Limited | Real estate | 2004 |
| RSM Fuels Limited | Wholesale & retail | 2009 |
| RSM Holdings Limited | Financial services | 2017 |
| Rsoh 1 Limited | Professional & scientific | 2026 |
| Rsrkb Group Holdings Limited | Professional & scientific | 2024 |
| Rssap Limited | Real estate | 2026 |
| Rssn Services Limited | Health & social care | 2024 |
| Rsta Investments Ltd | Real estate | 2022 |
| Rsvp Developments Ltd | Real estate | 2026 |
| Rsvp Investments Ltd | Real estate | 2016 |
| Rsvp MK 2 Ltd | Real estate | 2024 |
| RT Automotive Ltd | Other services | 2014 |
| RT Finishing Ltd | Construction | 2025 |
| RT Infotech Ltd | Information & communication | 2021 |
| RT Optical Limited | Health & social care | 2009 |
| RT Sixty Limited | Information & communication | 2008 |
| Rtabelectrical Ltd | Construction | 2023 |
| RTC Education Ltd | Education | 2002 |
| Rtngfc Limited | Professional & scientific | 2025 |
| RTS London Limited | Administrative & support | 2016 |
| RTV Networks Ltd | Construction | 2026 |
| Rubber Gloves Ltd | Wholesale & retail | 2022 |
| Ruben Dutta Associates Limited | Health & social care | 2016 |
| Ruben Plastering Limited | Construction | 2025 |
| Rubens Constructions Ltd | Construction | 2017 |
| Rubin Sailing Ltd | Extraterritorial | 2024 |
| Ruby & Co Consulting Ltd | Professional & scientific | 2017 |
| Ruby Group Ltd | Real estate | 2021 |
| Ruby KEW Limited | Hospitality | 2015 |
| Ruby Rock Limited | Construction | 2026 |
| RUC Services Ltd | Hospitality | 2025 |
| Rucheesh Ltd | Health & social care | 2023 |
| Ruchi Mistry Properties Limited | Real estate | 2023 |
| Rucktree Limited | Hospitality | 2002 |
| Ruco Consulting Limited | Transport & logistics | 2014 |
| Rudik Limited | Information & communication | 2015 |
| Rudik UK Limited | Information & communication | 2017 |
| Rudra Global Services Limited | Professional & scientific | 2023 |
| Rudra Imports Limited | Wholesale & retail | 2026 |
| Rudra Realty Ltd | Real estate | 2021 |
| Rudrak Ltd | Health & social care | 2022 |
| Rudrawati Limited | Hospitality | 2026 |
| Rudy & Sons Limited | Professional & scientific | 2011 |
| Rufford Investment House Limited | Real estate | 2014 |
| Ruhihub UK Ltd | Wholesale & retail | 2026 |
| Ruish Ltd | Wholesale & retail | 2026 |
| Ruislip Stars Nurseries Ltd | Education | 2013 |
| Ruislip Stars PRE School Limited | Education | 2016 |
| Ruksana Limited | Financial services | 2022 |
| Rumba Sailing Ltd | Administrative & support | 2023 |
| Rumdo Limited | Information & communication | 2017 |
| Rumi Life Ltd | Other services | 2022 |
| Rumon Gamba Limited | Arts & recreation | 2013 |
| Rumy Properties Limited | Real estate | 2021 |
| Run a Mocc Limited | Wholesale & retail | 2010 |
| Run FOG Ltd | Manufacturing | 2025 |
| Runaway Minds Limited | Information & communication | 2018 |
| Runisha Properties Ltd | Real estate | 2024 |
| Runteam II Limited | Information & communication | 2003 |
| Runway Property Management Limited | Households | 2023 |
| Rupert Cholmondeley Rainsford Mann Ltd | Extraterritorial | 2023 |
| Ruphx Limited | Wholesale & retail | 2025 |
| Rupron UK Ltd | Wholesale & retail | 2025 |
| RUS Construction Ltd | Construction | 2021 |
| RUS Services Ltd | Construction | 2015 |
| Rusen Group Ltd | Construction | 2023 |
| Rusgold Supplies Ltd | Wholesale & retail | 2021 |
| Rusland Park Ltd | Households | 2019 |
| Russettings Residents Limited | Real estate | 2004 |
| Russo Limited | Other services | 2011 |
| Rustic Town (UK) Limited | Wholesale & retail | 2017 |
| Rusu Investment Ltd | Real estate | 2024 |
| Rusu N&D Ltd | Construction | 2025 |
| Ruth Erotokritou Knitwear Limited | Wholesale & retail | 2007 |
| Ruthe Property Limited | Real estate | 2025 |
| Rutherford Investments Limited | Real estate | 1962 |
| Ruthland Residential Limited | Construction | 2016 |
| Ruthraa Ltd | Wholesale & retail | 2024 |
| Rutri Limited | Real estate | 2020 |