| R.J.O Medical Group Limited | Other services | 2024 |
| R.J.O Medical Limited | Transport & logistics | 2022 |
| R.James Interiors Ltd | Construction | 2025 |
| R.Livesey Ltd | Professional & scientific | 2019 |
| R.T Fencing & Supplies Ltd | Manufacturing | 2025 |
| R.T Fencing Supplies Ltd | Manufacturing | 2024 |
| R.T. Litho Limited | Other services | 1994 |
| R.T.G.1. Trading Limited | Extraterritorial | 2013 |
| R8 Solutions Limited | Wholesale & retail | 2008 |
| RAB Services (UK) Limited | Other services | 2014 |
| Rabmaris Limited | Professional & scientific | 2011 |
| Racecourse Rentals Ltd | Administrative & support | 2023 |
| RACHEL2021 Limited | Health & social care | 2021 |
| RAD Accounting Ltd | Professional & scientific | 2023 |
| Radex Limited | Transport & logistics | 2018 |
| Radford Park Management Company Limited | Households | 2008 |
| Radhegroup Ltd | Wholesale & retail | 2026 |
| Radiance by Imogen Limited | Other services | 2025 |
| Radiant Prosperity Holdings Ltd | Real estate | 2026 |
| Radiantwave Solar Ltd | Construction | 2025 |
| Radinn UK Limited | Construction | 2013 |
| Radio Colchester Ltd | Information & communication | 2018 |
| Radiographic Services Limited | Health & social care | 2014 |
| Raelmi Ltd | Wholesale & retail | 2024 |
| Rafael Global Services Limited | Wholesale & retail | 2019 |
| Raffle Magic Ltd | Arts & recreation | 2025 |
| Ragami Limited | Construction | 2025 |
| RAH and SON Roofing Limited | Construction | 2020 |
| Rail Professional Development Limited | Professional & scientific | 1997 |
| Rail-Tex Ltd | Professional & scientific | 2024 |
| Railway Engineering Consultants Ltd | Professional & scientific | 2026 |
| Rainbird Central Services Ltd | Financial services | 2024 |
| Rainbird Crane Services Ltd | Construction | 2015 |
| Rainbow Group Ltd | Construction | 2018 |
| Rainbow Parking & Valet Services Ltd | Administrative & support | 2008 |
| Rainbow Transport Limited | Transport & logistics | 2022 |
| Rainbows Bubble Tea Ltd | Hospitality | 2021 |
| Rainbows Pre-School (South East) Limited | Education | 2012 |
| Rainham Industrial Services Limited | Manufacturing | 2002 |
| Rainham Motors Limited | Wholesale & retail | 2022 |
| Raised Capital Limited | Financial services | 2025 |
| RAJ Goyal Ltd | Construction | 2014 |
| Ralph Supplies Ltd | Wholesale & retail | 2024 |
| RAM 1884 Ltd | Information & communication | 2013 |
| RAM Interior Solutions Ltd | Construction | 2024 |
| Ramasta Ltd | Wholesale & retail | 2026 |
| Ramsden Recruitment Limited | Administrative & support | 2014 |
| Ranasai Consultancy Services Ltd | Information & communication | 2023 |
| Randt Properties Limited | Real estate | 2018 |
| Rane Thermofluids Ltd | Professional & scientific | 2020 |
| Rangeten Limited | Real estate | 1963 |
| Rapha Wellness Group Limited | Health & social care | 2025 |
| Rapid Interiors Limited | Construction | 2012 |
| Rapid Mechanical Services Limited | Wholesale & retail | 2014 |
| Rapid Trading UK Ltd | Financial services | 2025 |
| Rapolinis Ltd | Transport & logistics | 2024 |
| Rascals Property Services Limited | Real estate | 2022 |
| Rascau Ltd | Construction | 2017 |
| Rasmussen Interiors Ltd | Construction | 2021 |
| Rath Project Consultancy Ltd | Professional & scientific | 2025 |
| Ravi's Newsagents Limited | Wholesale & retail | 2024 |
| Raving 4 a Reason C.I.C. | Information & communication | 2025 |
| Rawson Electrical Ltd | Professional & scientific | 2015 |
| Rawstorne Associates Limited | Information & communication | 2017 |
| RAY Parkin & Sons Limited | Arts & recreation | 1998 |
| RAY Rose Limited | Manufacturing | 1996 |
| Rayah Uzziel Care Limited | Health & social care | 2016 |
| Rayleigh Controls Ltd | Construction | 2019 |
| Raymond Odion UK Ltd Ltd | Public administration | 2022 |
| Rayvac Airtemp Ltd | Construction | 1987 |
| Rayvo Entertainment Limited | Information & communication | 2025 |
| Rayvo Travels Limited | Administrative & support | 2022 |
| Rayyans Properties Ltd | Real estate | 2025 |
| RB Fabrications Limited | Construction | 2026 |
| RB Foods Ltd | Hospitality | 2026 |
| RB Plumbers Limited | Construction | 2016 |
| RBA Services (UK) Limited | Administrative & support | 2012 |
| RBT Electrical Limited | Construction | 2022 |
| Rcab Construction Ltd | Construction | 2023 |
| RCB Electrical Limited | Construction | 2025 |
| RCO Management Group Limited | Information & communication | 2022 |
| RCP Scaffolding Consultancy Limited | Professional & scientific | 2026 |
| RD Evans Pump Engineers Limited | Manufacturing | 2015 |
| RDD Pressure Wash Ltd | Administrative & support | 2019 |
| RDH Flooring Limited | Construction | 2020 |
| RDL Construction Ltd | Construction | 2018 |
| Rdml Limited | Health & social care | 2021 |
| RDW Products Limited | Wholesale & retail | 2026 |
| RE Office Co Furniture Supplies Limited | Wholesale & retail | 2026 |
| RE Swift Vending Limited | Wholesale & retail | 2026 |
| Reach Where Limited | Wholesale & retail | 2025 |
| Reade & MAY Holdings Limited | Financial services | 2015 |
| Readspropertymaintenance Limited | Other services | 2019 |
| Real Bubbly Events Ltd | Hospitality | 2024 |
| Real Estate Luton Ltd | Real estate | 2025 |
| Realark Consultancy Limited | Wholesale & retail | 2007 |
| Realhouz Property Limited | Real estate | 2020 |
| Realise AI Ltd | Information & communication | 2023 |
| Realise AI Solutions Limited | Information & communication | 2026 |
| Realistic Expectations Ltd | Professional & scientific | 2025 |