| RS Worldwide Limited | Administrative & support | 2004 |
| RSA Investment Group Ltd | Transport & logistics | 2026 |
| RSA Investments Ltd | Other services | 2016 |
| Rsak Limited | Professional & scientific | 2014 |
| RSB Plumbing & Heating Ltd | Construction | 2017 |
| RSC Construction Limited | Construction | 2017 |
| Rscope Consultancy Limited | Information & communication | 2018 |
| RSD Project Consulting Limited | Professional & scientific | 2020 |
| RSD Sparkhill Limited | Wholesale & retail | 2025 |
| RSG Online Ltd | Wholesale & retail | 2016 |
| RSH Global Ltd | Wholesale & retail | 2025 |
| RSK Abseiling Ltd | Construction | 2017 |
| RSK Fast Food Ltd | Hospitality | 2025 |
| RSK Lettings Ltd | Real estate | 2024 |
| RSK Structures Ltd | Professional & scientific | 2023 |
| RSM Care Services Ltd | Administrative & support | 2017 |
| RSM Medicals Ltd | Administrative & support | 2020 |
| RSN Real Estate Limited | Real estate | 2020 |
| RSP Construction Ltd | Construction | 2006 |
| RSP Property Investments Ltd | Real estate | 2024 |
| RSP Removals Limited | Transport & logistics | 2025 |
| RSR Builds Limited | Construction | 2022 |
| RSS Consulting Engineers Ltd | Construction | 2013 |
| RSS Services (UK) Ltd | Professional & scientific | 2014 |
| RST Enterprise Ltd | Hospitality | 2022 |
| Rsvp Inspired Ltd | Construction | 2018 |
| RSW Assets Ltd | Real estate | 2024 |
| RSW Healthcare Services Ltd | Health & social care | 2021 |
| RSW Properties Development Ltd | Real estate | 2022 |
| RT KC Limited | Wholesale & retail | 2013 |
| RT Merchants Ltd | Wholesale & retail | 2024 |
| RT Optimal Solutions Ltd | Health & social care | 2025 |
| Rt&Jk Homes Ltd | Real estate | 2025 |
| RT7 Ltd | Construction | 2026 |
| RTC M&E Consultants Limited | Professional & scientific | 2012 |
| RTM E-Commerce Ltd | Wholesale & retail | 2024 |
| Rtns Properties Ltd | Real estate | 2024 |
| RTR Property Services Ltd | Construction | 2025 |
| Rtransport Ltd | Transport & logistics | 2024 |
| RTS Fruits and VEG Ltd | Wholesale & retail | 2021 |
| RTT Investments Ltd | Real estate | 2020 |
| RU Tech Limited | Wholesale & retail | 2024 |
| Ruam Property Ltd | Real estate | 2019 |
| Ruana Building Limited | Construction | 2007 |
| Rubaga Estates (UK) Ltd | Real estate | 2022 |
| Ruban & Inpan Ltd | Wholesale & retail | 2025 |
| Rubat AI Ltd | Information & communication | 2026 |
| Rubina Javid Training Ltd | Other services | 2019 |
| Rubpiesak Ltd | Professional & scientific | 2019 |
| Ruby Gold Limited | Real estate | 1997 |
| Rudolph Walker Productions Limited | Information & communication | 2022 |
| Rudra Frozen Foods Ltd | Wholesale & retail | 2025 |
| Rugged West Ltd | Wholesale & retail | 2023 |
| Rugs and Kilims Limited | Wholesale & retail | 2019 |
| Rugstack Floorings Limited | Wholesale & retail | 2019 |
| Rugvedh Services Limited | Information & communication | 2018 |
| Ruhina Hussain Ltd | Health & social care | 2023 |
| Ruma E-Commerce Solutions Ltd | Wholesale & retail | 2025 |
| Ruma Medicare Ltd | Health & social care | 2023 |
| Rumaan Hotels Ltd | Hospitality | 2024 |
| Rumaisa Ltd | Wholesale & retail | 2023 |
| Ruman Peri Peri Grill Company Ltd | Hospitality | 2015 |
| Rumango Ltd. | Information & communication | 2015 |
| Rumi Cars Limited | Wholesale & retail | 2021 |
| Rumi Group Limited | Transport & logistics | 2020 |
| Rumi SIX Ltd | Households | 2026 |
| Run Run Enigma Limited | Wholesale & retail | 2024 |
| Running Media House Ltd | Professional & scientific | 2021 |
| Runpot Ltd | Information & communication | 2026 |
| Rupa Trading Limited | Wholesale & retail | 2025 |
| Rupa's Aesthetics Ltd | Other services | 2023 |
| Rupa's Properties Ltd | Real estate | 2022 |
| Rupa's Teckniques Ltd | Other services | 2006 |
| Rupal & Associates Ltd | Financial services | 2013 |
| Rupra Ltd | Real estate | 2022 |
| Rupy Global Solutions Ltd | Information & communication | 2024 |
| Rush Express Limited | Transport & logistics | 2024 |
| Rush Green Property Limited | Real estate | 2023 |
| RUSH2CLEAN Limited | Administrative & support | 2017 |
| Rushe Construction Limited | Construction | 2024 |
| Rushlake Computers Limited | Information & communication | 1991 |
| Russell Estate Management Ltd | Real estate | 2023 |
| Russell Financial Broker Ltd | Real estate | 2025 |
| Russell House (East HAM) Residents Association Limited | Households | 1982 |
| Russell Properties Management LLP | | 2024 |
| Russhells Construction Ltd | Manufacturing | 2022 |
| Rust Oleum Never WET UK Limited | Manufacturing | 2014 |
| Rustic RAY Ltd | Wholesale & retail | 2019 |
| Rusz Ltd | Hospitality | 2024 |
| Ruten Sports Consultant Ltd | Arts & recreation | 2026 |
| Rutherford Contracts Limited | Construction | 1997 |
| Ruthin Hill Limited | Information & communication | 2023 |
| Ruthras Property Management Ltd | Hospitality | 2017 |
| RV & Co UK Ltd | Construction | 2017 |
| RV Heer Constructions Ltd | Construction | 2023 |
| RV Traders Ltd | Construction | 2020 |
| RVK Properties Limited | Real estate | 2024 |
| RW Consultant Ltd | Professional & scientific | 2026 |
| RWA Accountants Limited | Professional & scientific | 2024 |
| Rwelfare Ltd | Agriculture & fishing | 2020 |