| RNA Solutions Ltd | Professional & scientific | 2019 |
| Rnaps Properties Ltd | Real estate | 2018 |
| RND Softech UK Limited | Administrative & support | 2019 |
| Road Ready Auto Care Ltd | Wholesale & retail | 2026 |
| ROB MC Construction Limited | Construction | 2021 |
| Rob's Renovations Limited | Construction | 2013 |
| Robbs Services Ltd | Administrative & support | 2025 |
| Robel Haulage Ltd | Other services | 2017 |
| Robert Bosch UK Holdings Limited | Professional & scientific | 2010 |
| Robin Wood Grove Residents Limited | Real estate | 1986 |
| Roborough House Ltd | Health & social care | 2004 |
| ROC Northwest Limited | Health & social care | 2005 |
| Rocco Strategy Limited | Other services | 2019 |
| Rock Solid Images International Limited | Construction | 2010 |
| Rockarchive Limited | Extraterritorial | 2000 |
| Rockarchive.Com Limited | Professional & scientific | 1999 |
| Rockhopper Children's Services Limited | Health & social care | 1969 |
| Rockline Home Improvements Ltd | Construction | 2025 |
| Rocky's Southall Ltd. | Hospitality | 2023 |
| Rogers Carpentry Solutions Ltd | Information & communication | 2021 |
| ROH1 Services Ltd | Hospitality | 2025 |
| Rohit Chitara Construction Ltd | Construction | 2025 |
| Roketto UK Ltd | Administrative & support | 2015 |
| Roll&Shake Limited | Hospitality | 2014 |
| Rollover Limited | Hospitality | 1991 |
| Rome Construction Limited | Construction | 2017 |
| Romel Ltd | Information & communication | 2022 |
| Romney Court (Marlow) Limited | Real estate | 1983 |
| Romstar Construction Ltd | Administrative & support | 2022 |
| Rondebosch Express Ltd | Transport & logistics | 2026 |
| Ronin FX Limited | Professional & scientific | 2023 |
| Ronnievisuals Ltd | Information & communication | 2023 |
| Ronxy CAD Services Ltd | Information & communication | 2015 |
| Roop KI Ranu Ltd | Other services | 2024 |
| Rooted Wisdom Co. Ltd | Information & communication | 2026 |
| Rope Walk Securities Limited | Administrative & support | 1964 |
| Rosana Hair Master Trading Limited | Extraterritorial | 2015 |
| Rosca Ltd | Wholesale & retail | 2025 |
| Rose Square, Twickenham Management Company Limited | Households | 2024 |
| Rosebank Close RTM Company Limited | Households | 2022 |
| Rosedale Children's Services Limited | Health & social care | 2003 |
| Rosedeep Financial Services Limited | Professional & scientific | 1994 |
| Rosedene Court (Ruislip) Limited | Households | 1989 |
| Rosedene Mews Residents Company Limited | Households | 2012 |
| Rosemary Court Limited | Real estate | 1964 |
| Roserise Properties Ltd | Real estate | 2022 |
| Roses ARE Red Ltd | Other services | 2012 |
| Rosewood Pastiche Ltd | Construction | 2016 |
| Roshnab Limited | Other services | 2016 |
| Rosiness Ltd | Other services | 2020 |
| Rossis Construction Ltd | Construction | 2019 |
| Rounjx Ltd | Wholesale & retail | 2025 |
| ROUTES2EUROPE Ltd | Administrative & support | 2011 |
| ROW Eleven Development Ltd | Real estate | 2023 |
| Roxasrail Ltd | Professional & scientific | 2025 |
| ROY Accountants Ltd | Professional & scientific | 2015 |
| Royale Skin London Ltd | Health & social care | 2023 |
| Royston's Building Services Limited | Construction | 2015 |
| ROZ Baran Ltd | Hospitality | 2018 |
| RP Business Consultants Ltd | Administrative & support | 2015 |
| RP International Limited | Information & communication | 1998 |
| RP International Resources (Europe) Limited | Professional & scientific | 2006 |
| RP Painting Solutions Ltd | Construction | 2018 |
| RPA Technologies Limited | Information & communication | 2021 |
| RPN Services Ltd | Construction | 2023 |
| Rramtech Limited | Information & communication | 2016 |
| RRG Healthcare Harrow Branch Limited | Administrative & support | 2024 |
| RRG Holdings Limited | Financial services | 2019 |
| RRG Legal & Immigration Services Limited | Professional & scientific | 2019 |
| RRG Recruitment & Placement Limited | Administrative & support | 2024 |
| Rrss Ltd | Administrative & support | 2019 |
| Rrxh Limited | Extraterritorial | 1976 |
| Rrxil Limited | Extraterritorial | 1993 |
| Rrxo Limited | Extraterritorial | 1974 |
| RS (Acton) Properties Limited | Real estate | 2024 |
| RS (Braintree) Properties Limited | Real estate | 2024 |
| RS Rental and Development Limited | Construction | 2017 |
| RSA Carpentry Limited | Manufacturing | 2026 |
| Rsab Consulting Limited | Financial services | 2022 |
| RSB Financial Ltd | Financial services | 2015 |
| RSC Advisory Ltd | Financial services | 2016 |
| RSF Properties Development Ltd | Real estate | 2025 |
| RSG Architects Limited | Professional & scientific | 2022 |
| RSG HSF5 Ltd | Real estate | 2025 |
| RSG Motorsport Ltd | Professional & scientific | 2026 |
| RSG Ventures Ltd | Construction | 2018 |
| Rsgill Property Limited | Real estate | 2024 |
| Rsgvnt Ltd | Financial services | 2024 |
| RSK Accountants Limited | Professional & scientific | 2019 |
| Rskk Properties Ltd | Real estate | 2017 |
| Rskp 19 Homes Limited | Real estate | 2024 |
| Rskp 19 Management Limited | Real estate | 2025 |
| RSL Transport Limited | Transport & logistics | 2000 |
| RSR Vehicle Services Limited | Wholesale & retail | 2020 |
| Rssr Repair and Services Ltd | Wholesale & retail | 2020 |
| RST Accounts Solutions Ltd | Professional & scientific | 2017 |
| Rthuo Limited | Real estate | 2025 |
| RTV Limited | Professional & scientific | 2015 |
| Rubbish Solution Ltd | Water & waste | 2015 |
| Rubix Global Property Ltd | Real estate | 2023 |