| RMT Commercial Ltd | Financial services | 2024 |
| RMT Finances Limited | Financial services | 2021 |
| RMV Ventures Ltd | Health & social care | 2022 |
| RN Reward Solutions Limited | Professional & scientific | 2025 |
| Roadrush Media Ltd | Information & communication | 2023 |
| ROB Armstrong (Rigging) Limited | Construction | 2012 |
| ROB Daly Media Limited | Information & communication | 2016 |
| ROB Smith & SON Ltd. | Wholesale & retail | 2013 |
| Rob's Professional Services Limited | Administrative & support | 2020 |
| Robdabell.Com Limited | Information & communication | 2014 |
| Robert Milne Financial Advisers Limited | Financial services | 1994 |
| Robert Noseda Construction Skills Ltd | Education | 2015 |
| Robert Riordan Associates Ltd | Professional & scientific | 2014 |
| Robertson Milroy Limited | Professional & scientific | 1996 |
| Robin Hood (ST Johns) Management Company Limited | Households | 2007 |
| Robinson Marsh Ltd | Households | 2010 |
| Robmar Trade Express Limited | Wholesale & retail | 2025 |
| Robotik Management Limited | Households | 1999 |
| Rocky Books Ltd | Information & communication | 2025 |
| Roesti Limited | Hospitality | 2023 |
| Roger Mallet Ltd | Construction | 2023 |
| Rohantech Limited | Administrative & support | 2011 |
| Roland Property Limited | Real estate | 2025 |
| Rolands Handyman Services Ltd | Construction | 2019 |
| ROM Cleaning Ltd | Administrative & support | 2025 |
| Roman Wings Limited | Professional & scientific | 2015 |
| Romford Healthcare Limited | Wholesale & retail | 2023 |
| Romford Ice Hockey Supporters Club Ltd | Other services | 2025 |
| Romford Rendering Limited | Construction | 2024 |
| Roms and Raks Ltd | Extraterritorial | 2021 |
| Roneo Autocentre Ltd | Wholesale & retail | 2025 |
| Roof Care Company Group Ltd | Construction | 2025 |
| ROOM1118 Ltd | Information & communication | 2023 |
| Rootino CIC | Administrative & support | 2021 |
| Roqas Solutions Limited | Information & communication | 2016 |
| Rosa Valente Ltd | Real estate | 2026 |
| Rose Cafe ELM Limited | Hospitality | 2019 |
| Rose Caring Ltd | Health & social care | 2026 |
| Rose Donald Properties Limited | Real estate | 2021 |
| Rose Hall Estates Ltd | Real estate | 2023 |
| Rosehurst Associates Limited | Other services | 2017 |
| Roselyne Motors Ltd | Manufacturing | 2025 |
| Roselynne Ltd | Wholesale & retail | 2024 |
| Rosemere Funerals Ltd | Other services | 2025 |
| Roses Bakery Ltd | Wholesale & retail | 2002 |
| Rosieroseboutique Limited | Wholesale & retail | 2025 |
| Ross Roofing Limited | Construction | 2017 |
| Rossland Homes Ltd | Construction | 2021 |
| Rostranbuildingservice Ltd | Construction | 2019 |
| Rotherford Dales Limited | Information & communication | 1983 |
| ROUTES4LIFE Limited | Education | 2017 |
| Rovai Group Limited | Financial services | 2023 |
| Rowallan 19 Limited | Arts & recreation | 2023 |
| Rowley Cardrome Limited | Education | 1993 |
| Roxana Housing Solutions Ltd | Construction | 2025 |
| Roxee Traders Ltd Ltd | Wholesale & retail | 2020 |
| Roxwall Holdings Limited | Financial services | 2025 |
| Roy's People Art Fair Limited | Arts & recreation | 2016 |
| RP Talent Partners Ltd | Administrative & support | 2013 |
| RR Furniture Ltd | Construction | 2021 |
| RRK Investments Limited | Real estate | 2019 |
| RS AIM Services Ltd | Information & communication | 2017 |
| RS BIM Limited | Administrative & support | 2019 |
| RS Paint & Decor Ltd | Construction | 2026 |
| RS Prestige Services Ltd. | Administrative & support | 2021 |
| RS Talent & Consultancy Limited | Arts & recreation | 2023 |
| RSF Bodywork Repairs Limited | Wholesale & retail | 2023 |
| RSF Group Limited | Construction | 2021 |
| RSG Residential Limited | Real estate | 2024 |
| RSH Logistics Ltd | Transport & logistics | 2021 |
| RSK Services Limited | Other services | 2017 |
| RSP Property Maintenance Ltd | Construction | 2017 |
| RTK Leather HUT Ltd | Wholesale & retail | 2022 |
| Rubycon Investments Ltd | Real estate | 2020 |
| RUC Properties Limited | Real estate | 2025 |
| Rudd Rail Ltd | Administrative & support | 2025 |
| Rudhr Truckstop Limited | Financial services | 2025 |
| Ruisseau Ltd | Real estate | 2004 |
| RUL Marketing Limited | Other services | 2017 |
| Russel & Partners Limited | Professional & scientific | 2026 |
| Ruston Rail Limited | Construction | 2015 |
| Ruthie Media and Image Consultancy Ltd | Administrative & support | 2021 |
| Ruzzene Limited | Health & social care | 2019 |
| Rvkc Property Holdings Limited | Real estate | 2020 |
| RVL Property Limited | Real estate | 2020 |
| RWS Accounting Limited | Professional & scientific | 2025 |
| Ryan Enterprise London Ltd | Real estate | 2014 |
| RYB Property Ltd | Real estate | 2018 |
| Ryecroft Estates Ltd | Real estate | 2021 |
| Rymindr Limited | Other services | 2016 |
| S & a Care Limited | Health & social care | 2003 |
| S & B Construction London Limited | Construction | 2018 |
| S & J Flooring Limited | Construction | 2019 |
| S & L Interiors Ltd | Construction | 2024 |
| S & L Murphy Limited | Wholesale & retail | 2014 |
| S & L Property Services Limited | Real estate | 2019 |
| S & N Civils Ltd | Construction | 2024 |
| S & S Food Ventures Ltd | Wholesale & retail | 2017 |
| S C Roofing & Maintenance Limited | Construction | 2013 |
| S Cann Motors Limited | Wholesale & retail | 2015 |