| Remat (UK) Limited | Health & social care | 2008 |
| Remg Ltd | Information & communication | 2020 |
| Renami Consultancy Limited | Health & social care | 2021 |
| Renderlab Ltd | Information & communication | 2026 |
| Renewable Heat Finance Company Limited | Administrative & support | 2018 |
| Renewable Heat Management Company Limited | Administrative & support | 2020 |
| Renkox Capital Ltd | Financial services | 2025 |
| Renley Kitchens Ltd | Manufacturing | 2019 |
| Renovare Mechanical and Associated Services Ltd | Construction | 2016 |
| Rent Proprieta Ltd | Real estate | 2023 |
| Renton Holdings Limited | Financial services | 2022 |
| Reorg Fit Limited | Arts & recreation | 2024 |
| Reportyy Limited | Information & communication | 2022 |
| Reservoir Holdings Limited | Professional & scientific | 2015 |
| Reset Care Service Limited | Health & social care | 2023 |
| RESET-21 CIC | Education | 2021 |
| Reshape Cosmetics Ltd | Health & social care | 2013 |
| Reshape U.K Ltd | Real estate | 2004 |
| Resin Flooring HQ Ltd | Construction | 2016 |
| Resin Rich Flooring Limited | Construction | 2009 |
| Resolution People Limited | Professional & scientific | 2017 |
| Restora Properties Ltd | Real estate | 2024 |
| Restore Hope Community CIC | Health & social care | 2026 |
| Retoucan Limited | Real estate | 2019 |
| Retrac Carpentry & Joinery Limited | Construction | 2014 |
| Retrodubai Ltd | Professional & scientific | 2025 |
| Revelation Care Community Services Limited | Health & social care | 2010 |
| Revell Associates Limited | Financial services | 2008 |
| Revenue by Design Limited | Professional & scientific | 2006 |
| Revival Property and Services Ltd | Construction | 2025 |
| Revival Systems UK Ltd | Other services | 2020 |
| Revmai Limited | Information & communication | 2025 |
| Rexy Ltd | Wholesale & retail | 2021 |
| Reynolds Grab Services Limited | Wholesale & retail | 2011 |
| Reynolds Media Services Ltd | Information & communication | 2011 |
| RFC Fire Services and Maintenance Ltd | Administrative & support | 2025 |
| RFM Double Glazing Ltd | Construction | 2026 |
| Rgangel Limited | Transport & logistics | 2016 |
| RGS Partners LLP | | 2023 |
| RH HUBBUILD85 Ltd | Construction | 2025 |
| RH Silverbuild Ltd | Construction | 2025 |
| RHB Fire and Security Limited | Administrative & support | 2021 |
| Rhiw Property Limited | Real estate | 2024 |
| RHN Technical Limited | Information & communication | 2018 |
| Riam Limited | Health & social care | 2015 |
| Riazor Ltd | Real estate | 2021 |
| Ribd Ltd | Real estate | 2021 |
| Richard Nash Cars Limited | Wholesale & retail | 1982 |
| Richard Nash Holdings Limited | Financial services | 2019 |
| Richard Rogers Conservation Limited | Arts & recreation | 2005 |
| Richardsons Farm Development Ltd | Real estate | 2025 |
| Richborough Properties Limited | Real estate | 2026 |
| Richcont Properties Limited | Real estate | 2020 |
| Richly Bless Homes UK Limited | Hospitality | 2015 |
| Richman Holdings Limited | Financial services | 2024 |
| Richmond International Enterprises Limited | Information & communication | 2010 |
| Richvale Estates Ltd | Real estate | 2024 |
| Rickard Holdings Ltd | Real estate | 2024 |
| Ricos Corporation Ltd | Manufacturing | 2025 |
| Riddco Developments Limited | Real estate | 2025 |
| Riddle Consulting Ltd | Real estate | 2016 |
| Right Find Recruitment Limited | Administrative & support | 2023 |
| Rightlander Limited | Information & communication | 2018 |
| Rik&Art Electrical Ltd | Construction | 2021 |
| Rikkson Limited | Professional & scientific | 2012 |
| Rimzi Hair & Beauty Ltd | Wholesale & retail | 2014 |
| Ringlet Road Residents Management Company Limited | Households | 2025 |
| Ripe Associates Limited | Other services | 2017 |
| Ripley Builders Limited | Construction | 2009 |
| Ripples Services UK Ltd | Administrative & support | 2016 |
| Rising Champ Limited | Wholesale & retail | 2025 |
| Rising Sun Energy Services Ltd | Construction | 2019 |
| Risknova Limited | Professional & scientific | 2025 |
| Rismel Properties Ltd | Real estate | 2024 |
| River House Creative Limited | Other services | 2013 |
| River Windows Limited | Construction | 2003 |
| Riverside Motoring Centre Limited | Wholesale & retail | 2002 |
| Riverview Energy Ltd | Professional & scientific | 2021 |
| Riverwood Homes (Kent) Limited | Construction | 2016 |
| RJ Confectionery Ltd | Wholesale & retail | 2023 |
| RJC Interiors Ltd | Construction | 2013 |
| RJD Logistics Ltd | Transport & logistics | 2022 |
| RJF Steelwork and Engineering Ltd | Construction | 2018 |
| Rjmn Ltd | Professional & scientific | 2014 |
| RJW Contracts Limited | Construction | 2020 |
| RK Flow Solutions Ltd | Water & waste | 2025 |
| RL Cable Co Limited | Construction | 2026 |
| RL Ecocycle Limited | Construction | 2026 |
| RL Estates Management Limited | Construction | 2026 |
| RLD Ltd | Construction | 2024 |
| RLP Consult Ltd | Information & communication | 2023 |
| RM Diamond Solutions Ltd | Administrative & support | 2025 |
| RM Gold Plating Limited | Manufacturing | 2016 |
| RM Home Improvements and Refurbishments Ltd | Construction | 2023 |
| RMJ PM Services Ltd | Professional & scientific | 2024 |
| RMP Logistics Ltd | Transport & logistics | 2024 |
| RMS Building Services Ltd | Construction | 2019 |
| RMX Cloud Ltd | Information & communication | 2005 |
| RMX Connect Ltd | Information & communication | 2026 |
| RMX Group Ltd | Financial services | 2021 |