| Redguard Traffic Safety Services Ltd | Transport & logistics | 2025 |
| Redhouse Building Solutions Limited | Other services | 2022 |
| Redlands Construction Services Limited | Other services | 2008 |
| Redmimsy Ltd | Transport & logistics | 2019 |
| Redmore Kart Parts Limited | Wholesale & retail | 2025 |
| Redops Ltd | Information & communication | 2025 |
| Redowan & Sons Limited | Construction | 2021 |
| Redstone Construction Limited | Construction | 2017 |
| Redstone Trade Group Limited | Wholesale & retail | 2022 |
| Redwald Ltd | Administrative & support | 2019 |
| Redwood Capital Unlimited | Real estate | 2013 |
| Reece Consultancy Ltd | Information & communication | 2025 |
| Reel Attire Ltd | Wholesale & retail | 2023 |
| Reel Grappling Ltd | Arts & recreation | 2025 |
| Reelaxing Ltd | Real estate | 2017 |
| Reeleze Limited | Manufacturing | 2021 |
| Reelprint (Register Sets) Limited | Manufacturing | 1985 |
| Reema Construction Limited | Professional & scientific | 1947 |
| Refined Fixings Ltd | Professional & scientific | 2018 |
| Refined Getaways Ltd | Administrative & support | 2025 |
| Reflect Hair Ltd | Other services | 2024 |
| Reflex Optical Services Limited | Health & social care | 2015 |
| Reformed HER Studio Ltd | Arts & recreation | 2026 |
| Regal Cats Limited | Other services | 2023 |
| Regal Decorators Ltd | Construction | 2026 |
| Regal Electrics Ltd | Construction | 2016 |
| Regal Healthcare and Training Limited | Health & social care | 2018 |
| Regalia Ventures Ltd | Real estate | 2025 |
| Regaltech Consulting Ltd | Wholesale & retail | 2025 |
| Regan Building Services Ltd | Construction | 2022 |
| Regent Records Limited | Arts & recreation | 1988 |
| Regents Court Financial Limited | Financial services | 2003 |
| Regents Property Development Limited | Real estate | 2018 |
| Regimental Vape Limited | Wholesale & retail | 2017 |
| Regina Mint Limited | Extraterritorial | 2023 |
| Region Accountancy Ltd | Professional & scientific | 2018 |
| Region Security Guarding Limited | Administrative & support | 2014 |
| Region Security Limited | Administrative & support | 2017 |
| Regional Homes Ltd | Real estate | 2014 |
| Regional Homes Maintenance Limited | Other services | 2018 |
| Regis Beeches Management Limited | Administrative & support | 1973 |
| Regnum Supplies Limited | Wholesale & retail | 2024 |
| Rehan Consulting Ltd | Professional & scientific | 2026 |
| Rehan Holdings Limited | Real estate | 2021 |
| Rehan Humphries Consulting Limited | Professional & scientific | 2023 |
| Rehan Humphries Properties Limited | Real estate | 2021 |
| Rehanxcel Ltd | Wholesale & retail | 2025 |
| Rehmat Transport Ltd | Transport & logistics | 2021 |
| Rehoboth Health Consult Ltd | Education | 2016 |
| Reid Dina Corp Ltd | Health & social care | 2023 |
| Reign Music Ltd | Arts & recreation | 2022 |
| Reignbo Fields Ltd | Information & communication | 2021 |
| Reincarnate Realty Limited | Real estate | 2024 |
| Reinvntd CIC | Wholesale & retail | 2024 |
| Reiter UK Ltd | Professional & scientific | 1999 |
| Rejuvenate Training Limited | Administrative & support | 2017 |
| Rekindle AI Ltd | Information & communication | 2024 |
| Relate Shopfitters Limited | Construction | 2009 |
| Relax Oasis Massage Therapy Ltd | Health & social care | 2026 |
| Relay Solutions Ltd | Transport & logistics | 2025 |
| Reliance Commercial Limited | Construction | 2025 |
| Reliance Manufacturing Limited | Manufacturing | 2011 |
| Reliant Recruitment Limited | Administrative & support | 2017 |
| Relief Xpress Ltd | Wholesale & retail | 2024 |
| Relm Design and Build Ltd | Construction | 2026 |
| Reload UK Car Parts Ltd | Wholesale & retail | 2025 |
| Relvar Marketing Ltd | Professional & scientific | 2026 |
| Relyence UK Limited | Information & communication | 2016 |
| REM Building Ltd | Construction | 2020 |
| Remete Solutions Limited | Manufacturing | 2023 |
| Remorefreelance Ltd | Manufacturing | 2026 |
| Remus Construction Ltd | Water & waste | 2021 |
| Remy's Homes Property Ltd | Construction | 2022 |
| Renders Store Limited | Wholesale & retail | 2023 |
| Renew Body Therapy Ltd | Health & social care | 2025 |
| Renew Skin Aesthetics Ltd | Health & social care | 2025 |
| Renew Staffing Ltd | Administrative & support | 2021 |
| Renobuild Services Ltd | Construction | 2024 |
| Renovate Masters Construction Limited | Construction | 2025 |
| Renovation Legends Ltd | Construction | 2026 |
| Renove Skin Ltd | Other services | 2024 |
| Renstone Facades Limited | Manufacturing | 2017 |
| Renstone Holdings Limited | Financial services | 2026 |
| Rent Connect Ltd | Real estate | 2023 |
| Rent Star Ltd | Real estate | 2023 |
| Rentify ME Ltd | Administrative & support | 2024 |
| Renting Letting Solution Ltd | Real estate | 2020 |
| Renton Road Management Company Limited | Households | 2017 |
| Ren’S Boutique Ltd | Wholesale & retail | 2024 |
| Reoma Ltd | Professional & scientific | 2025 |
| Repaireco Limited | Water & waste | 2020 |
| Repairedtech Ltd | Wholesale & retail | 2022 |
| REPAIRS2HOMES Ltd | Other services | 2025 |
| Repclub Ltd | Wholesale & retail | 2026 |
| Replenished Ltd | Administrative & support | 2023 |
| Repose Featherstone Ltd | Hospitality | 2025 |
| Repton Ltd | Financial services | 2026 |
| Reqimril Ltd | Administrative & support | 2019 |
| RES Real Estate Investments Ltd | Real estate | 2025 |
| Resbloom Limited | Manufacturing | 2024 |