| R.M.W.S. Asbestos Removal (U.K.) Ltd | Wholesale & retail | 1980 |
| R.N.G. Properties Ltd | Real estate | 2000 |
| R.O.E Group Ltd | Wholesale & retail | 2024 |
| R.P. Weldon Limited | Wholesale & retail | 1978 |
| R.P.F. Scaffolding Limited | Construction | 1982 |
| R.S. Elsey & SON Limited | | 1972 |
| R.T.C. (Essex) Limited | Wholesale & retail | 1990 |
| R.W.Phillips Limited | Wholesale & retail | 1962 |
| Rabbi. Ltd | Wholesale & retail | 2021 |
| Rabi Medical Limited | Health & social care | 2003 |
| Rachel Stower Health Wealth and Social Care Law Limited | Professional & scientific | 2019 |
| Rackley Safety Solutions Ltd | Administrative & support | 2021 |
| Radacare Company Ltd. | Health & social care | 2006 |
| Radiandata Limited | Information & communication | 2024 |
| Radiant Eco Solutions Ltd | Manufacturing | 2024 |
| Radius Export Packing Services Ltd | Administrative & support | 2007 |
| Radix Screw Piling Ltd | Construction | 2023 |
| Radmere Group Ltd | Health & social care | 2025 |
| Radnor Lofts Ltd | Real estate | 2022 |
| Raem Professional Building Maintenance Limited | | 1970 |
| Rafa Care Services Ltd | Health & social care | 2019 |
| Rafay Industries Ltd Ltd | Wholesale & retail | 2022 |
| Raffingers Advisory Limited | Professional & scientific | 2014 |
| Raft Menswear Limited | Transport & logistics | 1989 |
| Rahal Management Ltd | Hospitality | 2021 |
| Rahman Group Ltd | Financial services | 2021 |
| Railway Tavern (Snakes Lane East) Ltd | Hospitality | 2024 |
| Rain GROUP1 Ltd | Wholesale & retail | 2026 |
| Rainbow Marketing Limited | Wholesale & retail | 2025 |
| Rainbow Printing Limited | | 1990 |
| Rainham Tyre Ltd | Wholesale & retail | 2026 |
| Raining Champs UK Limited | Other services | 2007 |
| Rainyuu Ltd | Wholesale & retail | 2023 |
| RAJ Indian Restaurant Limited | Hospitality | 1994 |
| Rajveer Singh and Co Limited | Professional & scientific | 2018 |
| RAK Doky Ltd | Wholesale & retail | 2026 |
| Rallytop Limited | Real estate | 1997 |
| Ralph G.Wilkin | | 1989 |
| Ralphsams Ltd | Wholesale & retail | 2026 |
| Ramsden Enterprises Limited | Administrative & support | 2007 |
| Ramsden Mills (East Anglia) Limited | Wholesale & retail | 1986 |
| Ramzcommerce Ltd | Wholesale & retail | 2026 |
| Rank SEO Agency Ltd | Professional & scientific | 2023 |
| Ranklink Limited | Wholesale & retail | 1990 |
| Ranm Wear Ltd | Wholesale & retail | 2026 |
| RAO Agency Ltd | Wholesale & retail | 2024 |
| Rapha Wholesome Limited | Health & social care | 2025 |
| Rapid Auto Assist (North West) Limited | Administrative & support | 2021 |
| Rapid Office Systems Limited | Manufacturing | 1979 |
| Rappid Technologies Limited | Information & communication | 2006 |
| Raqaw Beauty Limited | Wholesale & retail | 2021 |
| Rarcom Limited | Transport & logistics | 2014 |
| Rarebond Limited | Other services | 2007 |
| Rareselect Limited | | 1988 |
| RAS Bedding Ltd | Wholesale & retail | 2023 |
| Rashidkhaliq Ltd | Wholesale & retail | 2026 |
| Rasmali Ltd | Extraterritorial | 2000 |
| Rassel Building Services Ltd | Construction | 2022 |
| Rastro Tech Services Ltd | Information & communication | 2025 |
| Ratford Transport Ltd | Transport & logistics | 2018 |
| Rattanvibe Ltd | Wholesale & retail | 2024 |
| Ravi's (Basildon) Limited | Wholesale & retail | 2010 |
| Ravolut Ltd | Manufacturing | 2025 |
| RAW Perspective Ltd | Other services | 2016 |
| RAX Global Capital Limited | Financial services | 2026 |
| RAY Rutherford Building & Design Limited | Construction | 2003 |
| RAY Screen Limited | Real estate | 2002 |
| Raybrook Sheet Metal Works Limited | Manufacturing | 1964 |
| Rayleigh Indian Ltd | Hospitality | 2015 |
| Raymandawe Builders Limited | | 1987 |
| Rayne for Rayne Limited | Hospitality | 2026 |
| Rays Farm Business Units Limited | Real estate | 2007 |
| RB Window Systems Limited | Wholesale & retail | 2002 |
| RBC Waste and Estate Services Ltd | Water & waste | 2021 |
| RBM Accountancy Services Limited | Professional & scientific | 2006 |
| RBR Property Investments Limited | Real estate | 2006 |
| Rbvvk Ltd | Real estate | 2022 |
| RCH Heating & Plumbing Limited | Construction | 2004 |
| RD Caryl Consultants Limited | Professional & scientific | 2003 |
| RD Enterpprises Ltd | Wholesale & retail | 2020 |
| RDN Locums Limited | Professional & scientific | 2025 |
| Reach Autos Limited | Wholesale & retail | 2025 |
| Real Estate Solutions Limited | Real estate | 1998 |
| Real Store Ltd | Wholesale & retail | 2025 |
| Realistic Solutions Limited | Information & communication | 2000 |
| Rebecca Kate Limited | Health & social care | 2023 |
| Rebirth Group Ltd | Professional & scientific | 2022 |
| Reblis Films Ltd | Information & communication | 2016 |
| Recycle Textiles Ltd | Other services | 2024 |
| Recyclo Magic Ltd | Water & waste | 2025 |
| Red Bollywood Films Limited | Information & communication | 2021 |
| Red House Service Station Limited | Wholesale & retail | 1987 |
| Red Lion Books Limited | Wholesale & retail | 2005 |
| Red Lion Eggs Limited | | 1974 |
| Red Missile Ltd | Real estate | 2013 |
| Red River Management Limited | Professional & scientific | 2002 |
| Red Univers Ltd | Wholesale & retail | 2025 |
| Redbridge P&L Limited | Education | 2005 |
| Redbridge Sports Centre Trust Limited | Arts & recreation | 1971 |
| Redcliffe Properties (Ilford) Limited | Real estate | 2008 |