| Rotorsure Limited | Real estate | 1983 |
| Rottweiler Productions Limited | Information & communication | 2014 |
| Rough Trade Books Limited | Information & communication | 2017 |
| Rough Trade Music Limited | Arts & recreation | 2000 |
| Round Rentals Limited | Real estate | 2025 |
| Roundseats Properties Limited | Real estate | 2016 |
| Rousotronic Ltd | Wholesale & retail | 2018 |
| Route Global Ltd. | Arts & recreation | 2022 |
| Routeroot Ltd | Information & communication | 2026 |
| Routes Hair Extensions Limited | Wholesale & retail | 2016 |
| Rova Health Ltd | Health & social care | 2025 |
| Rovernighter Ltd | Wholesale & retail | 2015 |
| Rowan Digital Ltd | Professional & scientific | 2020 |
| Rowan, Rook and Decard Ltd | Manufacturing | 2017 |
| Rowanlee Limited | Real estate | 2009 |
| Rowguard Limited | Extraterritorial | 2023 |
| Rowland Scaffold Co Limited | Construction | 1990 |
| Rowland Scaffold Group Ltd | Construction | 2025 |
| Rowlands Racing & Research Limited | Professional & scientific | 2016 |
| Rowlands Telecoms Limited | Professional & scientific | 2007 |
| Rowlescourt Engineering Limited | Manufacturing | 1977 |
| Rowli's Dream CR5 Ltd | Hospitality | 2021 |
| Roxacos Optima Ltd | Health & social care | 2023 |
| Roxiva Innovations Ltd | Manufacturing | 2020 |
| Roxspa Ltd | Other services | 2017 |
| Roxspur Measurement & Control Limited | Manufacturing | 1966 |
| ROY France Digital Ltd. | Information & communication | 2016 |
| ROY Garvida Limited | Health & social care | 2023 |
| ROY Garvida Realty Limited | Real estate | 2025 |
| ROY Hancock Engineering Limited | Manufacturing | 1995 |
| Roya Fish Bar Ltd | Hospitality | 2023 |
| Royal Tool Control Limited | Manufacturing | 1968 |
| Royale Chauffeur Services Ltd | Transport & logistics | 2024 |
| Royale Citadel Limited | Health & social care | 2014 |
| Royd Lane Construction Limited | Construction | 2003 |
| Royds Mill Limited | Construction | 2025 |
| Royston Parkin Holdings Limited | Financial services | 2025 |
| Royston Parkin Limited | Professional & scientific | 2009 |
| Rozelle Ltd | Real estate | 2023 |
| RP Acoustics Ltd | Professional & scientific | 2018 |
| RP Brown Construction Ltd | Construction | 2023 |
| RP Convenience Store Ltd | Wholesale & retail | 2019 |
| RP Entertainment Limited | Information & communication | 2017 |
| RPG Healthcare Limited | Wholesale & retail | 2010 |
| RPH Maintenance Ltd | Construction | 2023 |
| RPK Automotive Limited | Wholesale & retail | 2023 |
| RPM Management Holdings Ltd | Mining & quarrying | 2022 |
| RR First Step Contractors Ltd | Construction | 2025 |
| RR Medic Ltd | Health & social care | 2022 |
| Rr&An Limited | Wholesale & retail | 2016 |
| RR2 Properties Ltd | Real estate | 2014 |
| RRC C&C Services Limited | Professional & scientific | 2018 |
| Rrgh Holdings Limited | Financial services | 2026 |
| Rrjs Trading Ltd | Real estate | 2025 |
| RRM Properties Ltd | Real estate | 2016 |
| Rrom International Ltd | Manufacturing | 2010 |
| RRR Hair Ltd | Other services | 2021 |
| Rrrr Holdings Ltd | Financial services | 2025 |
| RRT Hospitality Limited | Hospitality | 2025 |
| RRT Recycling Limited | Water & waste | 2013 |
| RRW Developments Ltd | Real estate | 2023 |
| RS Building Limited | Construction | 2018 |
| RS Car and Commercial Ltd | Wholesale & retail | 2026 |
| RS Cosmedics Ltd | Other services | 2014 |
| RS Food Consultancy Ltd | Hospitality | 2024 |
| RS Inc Ltd | Real estate | 2022 |
| RS Norse Ltd | Hospitality | 2025 |
| RS Payment Solutions Ltd | Other services | 2025 |
| RS Wheels Refurbishment Ltd | Manufacturing | 2014 |
| RS Wheels Refurbishment NE Ltd | Manufacturing | 2021 |
| RS Wheels Refurbishment NW Ltd | Manufacturing | 2022 |
| RS Wheels Refurbishment SC Ltd | Manufacturing | 2023 |
| RS Wheels Refurbishment South Limited | Manufacturing | 2022 |
| Rsama Limited | Real estate | 2026 |
| RSB Sheeting Limited | Construction | 2014 |
| RSC Security Solutions Limited | Manufacturing | 2005 |
| Rscb Ltd | Other services | 2018 |
| RSF Services Limited | Professional & scientific | 1996 |
| Rsha-Cluster Ltd | Professional & scientific | 2022 |
| RSK Hearts Ltd | Real estate | 2026 |
| RSM Autos Limited | Wholesale & retail | 2023 |
| RSM Civils and Recycling Ltd | Construction | 2025 |
| RSM Plumbing and Heating Ltd | Construction | 2020 |
| RSM Property Rentals Ltd | Other services | 2026 |
| RSM Readyset-Multitrade Ltd | Construction | 2023 |
| RSM Surfacing Limited | Construction | 2016 |
| RSM Vehicle Services Limited | Wholesale & retail | 2017 |
| RSP Financial Services Limited | Professional & scientific | 2011 |
| RSR Artwork Solutions Ltd | Professional & scientific | 2019 |
| RSR Design & Build Ltd. | Construction | 2018 |
| RSS Care Limited | Health & social care | 2024 |
| RSW Consulting Services Ltd | Information & communication | 2013 |
| RT Autos Trading Ltd | Wholesale & retail | 2023 |
| RT Creations Ltd | Professional & scientific | 2026 |
| RT Property Limited | Real estate | 2016 |
| RT Tour Management Limited | Arts & recreation | 2015 |
| RTC (Derbyshire) Limited | Financial services | 2021 |
| RTG Asset Holdings Limited | Financial services | 2025 |
| RTG Haulage Limited | Transport & logistics | 2025 |
| RTG Hospitality Ltd | Hospitality | 2022 |