| Rasm Motors Limited | Wholesale & retail | 2023 |
| Rastahh Ltd | Wholesale & retail | 2025 |
| Ratchet Straps Direct Limited | Wholesale & retail | 2019 |
| Rateneed Limited | Wholesale & retail | 1984 |
| Rathobixz Limited | Information & communication | 2021 |
| Rational UK Limited | Manufacturing | 1991 |
| Rattlin' Records Ltd | Other services | 2018 |
| RAV Boyz Ltd | Arts & recreation | 2019 |
| RAV Finance Ltd | Financial services | 2026 |
| Raven Trading Limited | Information & communication | 2000 |
| Ravencrest Noir Limited | Transport & logistics | 2025 |
| Ravens Recruitment Services Ltd | Administrative & support | 2015 |
| Ravenstone House (Leighton Buzzard) Ltd | Households | 2016 |
| Ravenstone House (Leighton Buzzard) RTM Company Limited | Households | 2004 |
| Ravenswood Management Company Limited | Households | 1970 |
| Ravjani Property Management Ltd | Households | 2025 |
| RAW Substance Records Limited | Information & communication | 2013 |
| RAW Therapy Ltd | Other services | 2022 |
| RAXX0 Limited | Wholesale & retail | 2025 |
| RAY Engineering Consultant Ltd | Manufacturing | 2010 |
| RAY Medics Ltd | Health & social care | 2021 |
| RAY Ride Limited | Transport & logistics | 2025 |
| Ray's Baking and Co. Ltd | Wholesale & retail | 2024 |
| Ray's Investments (Health) Limited | Health & social care | 2016 |
| Ray's Plumbing & Electrical Services Ltd | Construction | 2022 |
| Rayala's Ltd | Wholesale & retail | 2025 |
| Rayan & Adam Construction Ltd | Manufacturing | 2023 |
| Rayan Brothers Limited | Hospitality | 2024 |
| Rayan Hammad Global Trading Company Limited | Information & communication | 2025 |
| Raybridge Studham Limited | Construction | 2014 |
| Rayco Services Limited | Administrative & support | 2006 |
| Raydi Staffing Solutions Limited | Financial services | 2025 |
| Raydog Ltd | Professional & scientific | 2024 |
| Rayeeza Ltd | Health & social care | 2026 |
| Rayjjan Abedin LCS Ltd | Professional & scientific | 2025 |
| Rayjon Limited | Health & social care | 2023 |
| Rayna Ice Cream Ltd | Wholesale & retail | 2025 |
| Rayner Assets Limited | Professional & scientific | 2013 |
| Raynix Limited | Information & communication | 2025 |
| Rays Private Limited | Hospitality | 2025 |
| Raytronix Ltd | Professional & scientific | 2018 |
| Rayu Group Ltd | Hospitality | 2025 |
| Rayu PAN Asian Limited | Hospitality | 2025 |
| Rayyan & Co Ltd | Hospitality | 2010 |
| Rayyan & Co Services Ltd | Administrative & support | 2025 |
| Rayyan & Rayyan Limited | Information & communication | 2025 |
| Rayyan Cabs Limited | Transport & logistics | 2024 |
| Rayyan Fresh Fish Ltd | Wholesale & retail | 2023 |
| Rayyan Supermarket Ltd | Wholesale & retail | 2022 |
| RAZ Civil Engineering Ltd | Construction | 2026 |
| Raza Medics Limited | Wholesale & retail | 2005 |
| Razaq Builders Limited | Construction | 2023 |
| Razb Limited | Real estate | 2011 |
| Razia Estates Ltd | Hospitality | 2023 |
| Razor & Blade Ltd | Other services | 2018 |
| Razor & Blade Luton Ltd | Other services | 2020 |
| Razshi Limited | Wholesale & retail | 2019 |
| Razvan Construction Limited | Construction | 2012 |
| Razvanalin Ltd | Transport & logistics | 2024 |
| Razzle Sports Ltd | Manufacturing | 2022 |
| RB & Co Legal Ltd | Professional & scientific | 2025 |
| RB Builders Limited | Construction | 2020 |
| RB Communications Ltd | Information & communication | 2023 |
| RB Graphic Ltd | Manufacturing | 2019 |
| RB Indian Restaurant Ltd | Hospitality | 2015 |
| RB INT. Ltd | Wholesale & retail | 2020 |
| RB Law Ltd | Administrative & support | 2026 |
| RB Ultimate Solutions Limited | Construction | 2016 |
| RBA Aviation Services Ltd | Professional & scientific | 2023 |
| RBK Motors Limited | Wholesale & retail | 2018 |
| RBR Care Services Ltd | Education | 2025 |
| RC Construction Builders Ltd | Construction | 2020 |
| RC Lysy Cars Ltd | Manufacturing | 2015 |
| RC6 Limited | Other services | 2010 |
| Rcaa Construction Ltd | Construction | 2020 |
| Rcab Advsiory Limited | Administrative & support | 2026 |
| RCD Consultancy Limited | Professional & scientific | 2021 |
| Rclayss Ltd | Wholesale & retail | 2026 |
| RCM Advertising Limited | Professional & scientific | 2015 |
| Rcpm Construction Limited | Construction | 2017 |
| RCR Contruction Resourcing Limited | Construction | 2021 |
| RCS Facilities Ltd | Real estate | 2025 |
| RCS Region's Cleaning Services Ltd | Real estate | 2020 |
| RD Crew Ltd. | Construction | 2023 |
| RD Transporters Ltd | Transport & logistics | 2026 |
| RDD Brickwork Limited | Construction | 2023 |
| RDN Property Services Solutions Limited | Other services | 2023 |
| RE 5 Limited | Professional & scientific | 2022 |
| Re-Grounding Ltd | Education | 2026 |
| Re:Construct Works Ltd | Construction | 2025 |
| Ready 2 Drive Ltd | Administrative & support | 2017 |
| Ready Steady Smile Limited | Professional & scientific | 2025 |
| Readytac Ltd | Construction | 2000 |
| Real Estates Pinnacles Ltd | Real estate | 2026 |
| Real Legends Gym Ltd | Other services | 2025 |
| Real Mavericks Limited | Health & social care | 2022 |
| Realmtech Ltd | Information & communication | 2011 |
| Realspace Properties Limited | Construction | 2022 |
| Realt NA Mara Ltd | Construction | 2025 |
| Reap Management Limited | Real estate | 2019 |