| Red Koyla London Ltd | Hospitality | 2022 |
| Red Lion Court Hounslow Management Limited | Households | 1987 |
| Red Lion Supermarket Ltd | Wholesale & retail | 2021 |
| Red Roof Estate Agents Ltd | Real estate | 2020 |
| Reddi Solutions Ltd | Construction | 2025 |
| Redfern RE Limited | Construction | 2024 |
| Redglare Limited | Other services | 2019 |
| Redmark Contractors Ltd | Construction | 2023 |
| Redmark Investors Limited | Construction | 2024 |
| Redwood Brokerage Limited | Financial services | 2004 |
| Redwood SVC Ltd | Administrative & support | 2025 |
| Reelistic Lighting Ltd | Information & communication | 2016 |
| Reena Panchal Consulting Limited | Professional & scientific | 2019 |
| Reetz Homes Ltd | Real estate | 2023 |
| Refurb-Phone Ltd | Other services | 2011 |
| Refurbs and Renovations Ltd | Construction | 2016 |
| Regal Auto FIX Ltd | Wholesale & retail | 2026 |
| Regal Glazing Ltd | Construction | 2024 |
| Regal Tour Ltd | Hospitality | 2019 |
| Regel Medipharm Ltd | Wholesale & retail | 2023 |
| Regency Park Properties Ltd | Real estate | 2020 |
| Registered GAS Services Ltd | Construction | 2008 |
| Registered Limited | Administrative & support | 2018 |
| Registration Society of Homoeopathy UK | Other services | 2014 |
| Rego Financial Limited | Financial services | 2023 |
| Regus Softwares Ltd | Administrative & support | 2022 |
| Rehal Asthetics Limited | Health & social care | 2026 |
| Rehma Packaging Limited | Administrative & support | 2023 |
| Rehman Capital Ltd | Financial services | 2025 |
| Reidy's Care Ltd | Health & social care | 2014 |
| Reimagine Data Solutions Ltd | Information & communication | 2022 |
| Rekro Recruitment Ltd | Administrative & support | 2026 |
| Reliance Financial Services Limited | Financial services | 2021 |
| REM Media Ltd | Professional & scientific | 2023 |
| REM Trans Pro Ltd | Construction | 2022 |
| Remai London Ltd | Wholesale & retail | 2024 |
| Remedy Relief Ltd | Wholesale & retail | 2021 |
| Renaissance Consultants Chambers Ltd | Wholesale & retail | 2015 |
| Renata's Cosmetics Limited | Wholesale & retail | 2024 |
| Rene Gade Consulting Limited | Real estate | 2025 |
| Reneul Ltd | Wholesale & retail | 2022 |
| Renewal Energy Solutions Ltd | Energy | 2025 |
| Renmeet Limited | Wholesale & retail | 2015 |
| Rennex Ltd | Real estate | 2022 |
| Renovate With MJ Construction Ltd | Construction | 2026 |
| Renovate With MJ Ltd | Construction | 2025 |
| Renovatio Construction Ltd | Construction | 2024 |
| Renovatxpert Ltd. | Construction | 2024 |
| Renovie Hair Ltd | Manufacturing | 2024 |
| Rent Help Limited | Transport & logistics | 2025 |
| Rent-E-Cars Ltd | Administrative & support | 2022 |
| Rental and CAB Services Ltd | Transport & logistics | 2026 |
| Rentivity Ltd | Real estate | 2025 |
| Renture Ltd | Real estate | 2021 |
| Renuka Consultants Ltd | Information & communication | 2013 |
| Res-Tech Ltd | Construction | 2018 |
| Residential Facility Cleaners Limited | Administrative & support | 2025 |
| Resolute Partners Limited | Administrative & support | 2024 |
| Resscan Limited | Other services | 2021 |
| Rest Assure Care Ltd | Public administration | 2020 |
| Rest Tech Ltd | Information & communication | 2024 |
| Restbest Ltd | Wholesale & retail | 2026 |
| Retail 804 Ltd | Wholesale & retail | 2024 |
| Retail Detailed Limited | Information & communication | 2020 |
| Retro Housing Limited | Construction | 2023 |
| Retroo Ltd | Information & communication | 2024 |
| REV Auto Hub Limited | Wholesale & retail | 2025 |
| Reva Consulting Ltd | Information & communication | 2020 |
| Revitalise Supplements Ltd | Manufacturing | 2024 |
| Revivebyte Limited | Wholesale & retail | 2026 |
| Revolution Construction Company Ltd | Construction | 2017 |
| Revva Limited | Water & waste | 2025 |
| Revva Properties Limited | Real estate | 2025 |
| Rewolucja Limited | Wholesale & retail | 2011 |
| REX Properties Limited | Real estate | 1997 |
| Reyan Technologies Ltd | Information & communication | 2020 |
| Reza Accounting & Tax Services Ltd | Professional & scientific | 2010 |
| RG Practice Limited | Health & social care | 2009 |
| Rgds Construction Ltd | Construction | 2025 |
| Rgee E Ltd | Transport & logistics | 2023 |
| RGG Investments Limited | Real estate | 2023 |
| RGV Divines Ltd | Hospitality | 2019 |
| RH Hospitality Hounslow Ltd | Hospitality | 2025 |
| Rhino Global Goodies Limited | Hospitality | 2025 |
| Rhoose Food & Wine Limited | Wholesale & retail | 2019 |
| RHS Travel Ltd | Transport & logistics | 2024 |
| Rhuville Investments Ltd | Real estate | 2025 |
| Rhythmistan Ltd | Information & communication | 2024 |
| RIB Construct Ltd | Construction | 2025 |
| Rich-Stream Enterprise Ltd | Transport & logistics | 2020 |
| RICH2BEAN Limited | Hospitality | 2020 |
| Richland Properties Ltd | Real estate | 2017 |
| Richmond House Limited | Real estate | 2024 |
| Richmond KEW Kitchen Ltd | Hospitality | 2025 |
| Richmond KEW Restaurants Ltd | Real estate | 2025 |
| Richmond Mortgage Services Limited | Financial services | 2016 |
| Richmond Premium Ltd | Hospitality | 2026 |
| Richmond Premium Tea Ltd | Manufacturing | 2024 |
| Ricky Sharma Limited | Information & communication | 2011 |
| Rideverse Ltd | Wholesale & retail | 2025 |