| R.C. Grant Ltd | Administrative & support | 2008 |
| R.J. Isbell & SON (East Anglia) Limited | Construction | 1960 |
| R.J. Prior & SON (Burnham) Limited | Manufacturing | 1945 |
| R.J.Isbell & SON Limited | Construction | 1953 |
| R.P Capital Consultants Ltd | Professional & scientific | 2021 |
| R4 Industrial Roofing Cladding Systems Limited | Construction | 2003 |
| RAC Catering Ltd | Hospitality | 2025 |
| Rack`N`Roll Limited | Information & communication | 2003 |
| Radiant Plumbing and Heating Ltd | Construction | 2021 |
| Radio PR Limited | Extraterritorial | 2012 |
| Radius Building Services Limited | Construction | 2011 |
| Rail Business Solutions Limited | Professional & scientific | 2011 |
| Rainbird Place Management Limited | Households | 2018 |
| Raja Portfolio Group Ltd | Real estate | 2023 |
| Ralt Ltd | Health & social care | 2025 |
| Raly Ltd | Real estate | 2022 |
| Ranald Mackechnie Limited | Professional & scientific | 2002 |
| Rands IT Consultancy Limited | Information & communication | 2003 |
| Rank Interiors Limited | Extraterritorial | 2010 |
| Ranthonyr Ltd | Real estate | 2025 |
| Rantree Properties Limited | Real estate | 2016 |
| Rawley Hire Limited | Administrative & support | 1968 |
| Rawreth Barns Management Company Limited | Households | 2024 |
| Rawreth Equestrian Centre Ltd | Education | 2023 |
| Rawreth Garage Limited | Wholesale & retail | 2021 |
| RAY Castley & Co Ltd | Professional & scientific | 1997 |
| RAY Dickinson Ltd | Construction | 2015 |
| Rayleigh Electrical Services Limited | Construction | 2016 |
| RBL Property Management Limited | Real estate | 2019 |
| Rboe Ltd | Financial services | 2025 |
| RDH Design Ltd | Administrative & support | 2018 |
| Readers Yard 2023 Ltd | Real estate | 2023 |
| Real Media Advertising Ltd | Professional & scientific | 2019 |
| Realm Mortgages Limited | Financial services | 2022 |
| Reclaimed Bars Ltd | Wholesale & retail | 2021 |
| Reconstruction Ltd | Construction | 2025 |
| Red Chilli House Ltd | Hospitality | 2025 |
| Red Oak Environmental Limited | | 2011 |
| Redback Roofing Ltd | Construction | 2025 |
| Redivus Ltd | Manufacturing | 2024 |
| Reds Party Company Limited | Other services | 2022 |
| Reef App Ltd | Information & communication | 2019 |
| Reeves Electrical Wholesalers (Havering) Limited | Wholesale & retail | 1964 |
| Refectory Apartments Freehold Ltd | Real estate | 2015 |
| Reflect-Design for Print Limited | Professional & scientific | 2009 |
| Reflection Perfection Maintenance Services Limited | Administrative & support | 2022 |
| Regal Elevators & Lift Consultants Ltd | Manufacturing | 2017 |
| Regulated Consultants Limited | Professional & scientific | 2021 |
| Rehoboth Pharmaclinicals Ltd. | Health & social care | 2017 |
| Reid’S Auto Repairs Ltd | Wholesale & retail | 2026 |
| Rejuvia NAD Ltd | Wholesale & retail | 2025 |
| Relax With Alice Limited | Other services | 2024 |
| Relentless Gyms Ltd | Arts & recreation | 2025 |
| Reliable Sealants Limited | Construction | 2019 |
| Relo Insurance Services Limited | Financial services | 2008 |
| Rememorial Limited | Hospitality | 2024 |
| Renderproof House Preservation Limited | Construction | 2014 |
| Renewable Energy Engineering Services Ltd | Construction | 2024 |
| Renewrgy II Ltd | Construction | 2019 |
| Renofix Ltd | Construction | 2024 |
| Reston Services Limited | Professional & scientific | 2024 |
| Resurge Risk Solutions Ltd | Administrative & support | 2025 |
| Retro Bambi Ltd | Wholesale & retail | 2022 |
| Revabay Holdings Limited | Financial services | 2024 |
| Revabay Limited | Wholesale & retail | 2005 |
| REX & Premier Limited | Real estate | 2014 |
| RH Cars & Commercials Ltd | Wholesale & retail | 2024 |
| Rhys D Electrical Limited | Construction | 2025 |
| Rica Property Solutions Ltd | Real estate | 2024 |
| Richer Pictures Limited | Professional & scientific | 2014 |
| Richmond Cook Engineering Ltd | Construction | 2013 |
| Rickinghall Bell Limited | Hospitality | 2021 |
| Rihas Concept Limited | Manufacturing | 2019 |
| RIO Coffee Limited | Hospitality | 2015 |
| Rishawan Summun Limited | Real estate | 2023 |
| Risk and Compliance Management Ltd | Professional & scientific | 2021 |
| River View Walk Management Company Limited | Households | 2007 |
| Riviera Networks Limited | Information & communication | 2003 |
| RJ Emmanuel Ltd | Professional & scientific | 2010 |
| RJ Performance Limited | Wholesale & retail | 2025 |
| RJB Interiors Limited | Construction | 2014 |
| RJH Property Improvements Ltd | Construction | 2019 |
| RJL Family Holding Limited | Financial services | 2021 |
| RJL Management Services Limited | Administrative & support | 2019 |
| RJL Properties Limited | Real estate | 2016 |
| RJL Property Services Ltd | Real estate | 2021 |
| RJP Damp & Building Specialists Limited | Construction | 2023 |
| RKG Racing Ltd | Professional & scientific | 2011 |
| RKM Property Limited | Real estate | 2020 |
| RLA Digital Ltd | Wholesale & retail | 2023 |
| RLG Property Management Limited | Real estate | 2022 |
| RM Vehicle Specialist Ltd | Wholesale & retail | 2025 |
| RMC Brown Limited | Professional & scientific | 2024 |
| RMG Construction Group Limited | Construction | 2018 |
| RMT Holdings Ltd | Real estate | 2023 |
| Roar Through Art CIC | Health & social care | 2023 |
| Robert Travers (Works of Art) Limited | Wholesale & retail | 2005 |
| Robertson Irving Osteopathy Ltd | Health & social care | 2020 |
| ROC Plus Ltd | Construction | 2024 |
| Rockdel Limited | Professional & scientific | 2010 |