| R.H.Products Ltd | Wholesale & retail | 2019 |
| R.J. Miles Engineering Ltd | Professional & scientific | 2014 |
| R.J.Goddard & Son,Limited | Real estate | 1965 |
| R.L. Petchey Limited | Construction | 1981 |
| R.L.D Cosmetic Repairs Ltd | Construction | 2024 |
| R.Mclester Builders Ltd | Construction | 2017 |
| R.N.R Recruitment Ltd | Administrative & support | 2018 |
| R.S Gibson Limited | Construction | 2023 |
| R.Whites Classics Ltd | Wholesale & retail | 2024 |
| R.Y Groundworks Ltd | Construction | 2023 |
| R1 Transport Ltd | Transport & logistics | 2023 |
| R2RSERVICES4U Ltd | Households | 2025 |
| R30 Properties Ltd | Real estate | 2021 |
| R3MY Collective Management Limited | Extraterritorial | 2024 |
| R8 Scaffolding Services Ltd | Construction | 2023 |
| R8AI Ltd | Information & communication | 2025 |
| RA Wells & Partner Ltd | Construction | 2016 |
| Raavi Limited | Administrative & support | 2018 |
| RAB & Tawa Ltd | Real estate | 2025 |
| RAB Driving Instructor Limited | Education | 2025 |
| Rabbit & Rose Limited | Hospitality | 2016 |
| Rabd Limited | Financial services | 2020 |
| Race Against Time | Manufacturing | 2012 |
| Race Furniture Limited | Manufacturing | 1989 |
| Race Stays Limited | Other services | 2021 |
| Racework Ltd | Professional & scientific | 2024 |
| Rachel Priest Cricket Limited | Professional & scientific | 2024 |
| Rachen Healthcare Ltd | Health & social care | 2022 |
| RAD Motorcycles Limited | Wholesale & retail | 2020 |
| Radbot Reporting Ltd | Health & social care | 2024 |
| Radcliffe Healthcare Limited | Health & social care | 2025 |
| Radford Cleaning Services Ltd | Administrative & support | 2025 |
| Radford Roofing Limited | Construction | 2025 |
| Radian Resourcing Ltd | Administrative & support | 2014 |
| Radiant Soul Records Ltd | Information & communication | 2026 |
| Radiate (Luton) Limited | Construction | 2018 |
| Radicool Air Conditioning Ltd | Construction | 2026 |
| Radio Structures Limited | Manufacturing | 1983 |
| Radio Venus Limited | Information & communication | 2013 |
| Radio, Electrical and Television Retailers' Association (R.E.T.R.A.) Limited | Administrative & support | 1942 |
| Radius Group Limited | Construction | 2008 |
| Radius Property Holdings Ltd | Real estate | 2017 |
| Radocha Limited | Transport & logistics | 2016 |
| Raduninter Ltd | Administrative & support | 2015 |
| RAF Recycling Limited | Water & waste | 2024 |
| RAF Trans 1980 Ltd | Transport & logistics | 2015 |
| Rafael and Sons Ltd | Real estate | 2021 |
| Rafal Partyka Limited | Transport & logistics | 2016 |
| Rafer Holdings Ltd | Real estate | 2024 |
| Raff and Van Removals Ltd | Transport & logistics | 2019 |
| Raffle Join Ltd | Wholesale & retail | 2023 |
| Rafiki Transport Ltd | Transport & logistics | 2023 |
| Rafkoz IT Solutions Limited | Information & communication | 2024 |
| Rafla MED Ltd | Wholesale & retail | 2003 |
| Rafter Associates Financial Management Limited | Financial services | 1986 |
| Rafter Wills & Estate Planning Ltd | Financial services | 2012 |
| Ragaru Trans Ltd | Transport & logistics | 2019 |
| Raggamama Ltd | Hospitality | 2020 |
| Ragstone Limited | Professional & scientific | 2007 |
| Rahman Olusesi Properties Ltd | Real estate | 2025 |
| RAI Alliance Group Ltd | Real estate | 2025 |
| Rail Train Ltd | Education | 2026 |
| Raimo Cleaning Ltd | Administrative & support | 2019 |
| Raimond Services Ltd | Administrative & support | 2017 |
| Rain Labs Entertainment Ltd | Arts & recreation | 2021 |
| Rainbird Irrigation (UK) Limited | Professional & scientific | 1996 |
| Rainbow Dreams Limited | Construction | 2026 |
| Rainbow Frost Enterprises Limited | Extraterritorial | 2006 |
| Rainbow Frost Limited | Extraterritorial | 2006 |
| Rainbow House Nursery Ltd | Education | 2013 |
| Rainbow XYZ Limited | Financial services | 2016 |
| Raine E Day Productions Ltd | Arts & recreation | 2014 |
| Rainforest Parrots Limited | Agriculture & fishing | 2021 |
| Rais Opportunities Ltd | Information & communication | 2015 |
| Raising Stage Ltd | Construction | 2024 |
| RAJ & Lilu Limited | Wholesale & retail | 2018 |
| Raj's Nail Salon Ltd | Other services | 2021 |
| Raja RSY Ltd | Wholesale & retail | 2018 |
| Rajlila (1) Limited | Administrative & support | 2021 |
| Rajlila Investments Ltd | Financial services | 2019 |
| Rajlila Limited | Wholesale & retail | 2006 |
| RAK Trans Ltd | Transport & logistics | 2020 |
| Rake Support Limited | Administrative & support | 2022 |
| Rakmino Ltd | Wholesale & retail | 2026 |
| Rallfie Ltd | Real estate | 2023 |
| RAM Coding Ltd | Information & communication | 2024 |
| RAM Galaxy Ltd | Transport & logistics | 2026 |
| RAM Krishna Ltd | Arts & recreation | 2014 |
| RAM Management Consultants Ltd | Information & communication | 2021 |
| Rames Engineering Ltd | Professional & scientific | 2025 |
| Rami Barbers Ltd | Other services | 2015 |
| Ramona V151ON Ltd | Transport & logistics | 2023 |
| Ramonadclean Ltd | Administrative & support | 2025 |
| Ramses Frederickx Design Ltd | Professional & scientific | 2015 |
| Ramsey Park Residents Management Company Limited | Households | 2021 |
| Ramshackle Productions Limited | Information & communication | 2015 |
| Ramz Supported Services Ltd | Health & social care | 2024 |
| Ramé Official Ltd | Professional & scientific | 2020 |
| Rana Frieght Carriers Limited | Transport & logistics | 2020 |
| Rana Tofiq Harrison Limited | Extraterritorial | 2024 |