| Roycerad Mechelec Ltd | Construction | 2023 |
| Royem Scientific Limited | Wholesale & retail | 2001 |
| Royez Services Ltd | Administrative & support | 2023 |
| Royle Kashmir Travel Limited | Administrative & support | 2019 |
| Royvalue Ltd | Wholesale & retail | 2025 |
| RP Client Representative Services Ltd | Professional & scientific | 2024 |
| RPL PAY Limited | Information & communication | 2025 |
| RPN Limited | Construction | 1995 |
| RPO Drywall Finishers Limited | Extraterritorial | 2022 |
| Rpsb Ltd | Construction | 2018 |
| RR Coventry Limited | Hospitality | 2018 |
| RR Executive Travel Ltd | Transport & logistics | 2023 |
| RR Gill Haulage Ltd | Transport & logistics | 2024 |
| RR Gill Services Ltd | Transport & logistics | 2024 |
| RR Laundrette Ltd | Other services | 2025 |
| Rr&K Services Ltd | Wholesale & retail | 2020 |
| Rr&M Ltd | Wholesale & retail | 2025 |
| RRF DC Solutions Limited | Professional & scientific | 2024 |
| Rrfsm & Co Limited | Wholesale & retail | 2025 |
| RRL Services Ltd | Construction | 2023 |
| Rrs-C-Solutions Ltd | Financial services | 2025 |
| RRT (UK) Limited | Manufacturing | 2009 |
| RRT Consultancy Limited | Professional & scientific | 2018 |
| RS Accounting Solutions Limited | Professional & scientific | 2019 |
| RS Building Surveyors Ltd | Professional & scientific | 2022 |
| RS Capital Holdings Limited | Real estate | 2017 |
| RS City Cars Ltd | Wholesale & retail | 2025 |
| RS Dates Ltd | Wholesale & retail | 2025 |
| RS Hire Machinery Ltd | Administrative & support | 2018 |
| RS Investments Bedfordshire Ltd | Extraterritorial | 2017 |
| RS Motor Group Limited | Wholesale & retail | 2023 |
| RS Properties & Mgmt Ltd | Construction | 2020 |
| RS Properties Group Ltd | Real estate | 2025 |
| RS Sports Clubs Ltd | Education | 2021 |
| RS Technical Engineering Ltd | Manufacturing | 2023 |
| RS Training Ltd | Education | 2021 |
| RS Travel and Lettings Limited | Real estate | 2017 |
| Rs-Ahmed Consultancy Limited | Education | 2023 |
| Rs-V ANP Ltd | Health & social care | 2024 |
| RS3 Limited | Wholesale & retail | 2026 |
| RSB Distribution Ltd | Wholesale & retail | 2024 |
| RSF Transport Services Ltd | Transport & logistics | 2021 |
| RSG Building Innovations Ltd | Construction | 2019 |
| RSG Invest Nest Ltd | Real estate | 2024 |
| Rskpayment Limited | Health & social care | 2014 |
| RSL & Partners Ltd | Professional & scientific | 2024 |
| RSL Plumbers Limited | Construction | 2002 |
| RSQ Performance Ltd | Wholesale & retail | 2025 |
| RSR International Limited | Information & communication | 2017 |
| RSS JET Centre Limited | Transport & logistics | 1961 |
| Rsynergy Limited | Information & communication | 2023 |
| RSZ Scientific Limited | Professional & scientific | 2014 |
| RT Consultants (Private) Limited | Professional & scientific | 2026 |
| RT Energy Ltd | Construction | 2020 |
| RTH Builds Ltd | Construction | 2026 |
| RTH Horsepower Ltd | Transport & logistics | 2023 |
| Rtistic Ltd | Wholesale & retail | 2018 |
| RTK Electrical Ltd | Construction | 2025 |
| RTM Land Consultancy Limited | Administrative & support | 2023 |
| RTS Builders Ltd | Construction | 2023 |
| RTT Insourcing Ltd | Health & social care | 2021 |
| RTW Plastering Ltd | Construction | 2019 |
| Ruach Consulting Limited | Professional & scientific | 2009 |
| Rubys Foundation | Health & social care | 2015 |
| Ruckit Rugby Ltd | Wholesale & retail | 2025 |
| Rudi Services Ltd | Professional & scientific | 2018 |
| Rudy's Building Services Ltd | Construction | 2026 |
| RUE Property Services Ltd | Real estate | 2022 |
| Rugby First Choice Limited | Professional & scientific | 2010 |
| Rugstore Shop Ltd | Wholesale & retail | 2020 |
| Ruhel Consultancy Ltd | Information & communication | 2018 |
| Rukkyz Kitchen Limited | Hospitality | 2025 |
| RUM & Waffle Ltd | Hospitality | 2020 |
| Rumaab & Co Ltd | Wholesale & retail | 2020 |
| Rumaisas Collection Ltd | Wholesale & retail | 2025 |
| Rumel Catering Limited | Hospitality | 2024 |
| Rumel Transport Ltd | Transport & logistics | 2025 |
| Rumi Ltd | Wholesale & retail | 2024 |
| Rumiancevas Drivers Ltd | Transport & logistics | 2021 |
| Run Haulage Private Limited | Transport & logistics | 2025 |
| Run Save Recovery Ltd | Other services | 2019 |
| Running Away Ltd | Hospitality | 2018 |
| Running Blades Ltd | Other services | 2024 |
| Running MAD | Arts & recreation | 2020 |
| Rupak Investment Limited | Real estate | 2018 |
| Rupinder Delivery Services Ltd | Transport & logistics | 2025 |
| Ruposhi Mens Ware Ltd | Wholesale & retail | 2020 |
| Rupp UK Ltd | Manufacturing | 2024 |
| Ruqive Ltd | Wholesale & retail | 2022 |
| Rushdencars Ltd | Wholesale & retail | 2018 |
| Rushmore Holding Ltd | Financial services | 2026 |
| Russam GMS Ltd | Administrative & support | 1984 |
| Russam Holdings Limited | Financial services | 2014 |
| Rusu Fittings Ltd | Construction | 2026 |
| Ruth Baker Flowers Ltd | Wholesale & retail | 2025 |
| Ruth Healthcare Services Limited | Public administration | 2019 |
| Rutland Court (Luton) Limited | Households | 1969 |
| Rutland Mews (Bakewell) RTM Company Limited | Households | 2009 |
| Rutland Paving Ltd | Administrative & support | 2017 |
| Rutotech Health Limited | Administrative & support | 2025 |