| Ramgfx Ltd | Information & communication | 2011 |
| Random Square Ltd | Administrative & support | 2022 |
| Ranvijay Limited | Professional & scientific | 2011 |
| Rappid Test Services Ltd | Information & communication | 2013 |
| Rare and Flare Limited | Extraterritorial | 2013 |
| Rattic Pest Control Ltd | Professional & scientific | 2020 |
| Ravensgate (Brockley) Limited | Administrative & support | 2017 |
| Raven’S Forge (Stone) Management Company Ltd | Households | 2017 |
| RAY Paul Property Limited | Real estate | 2020 |
| Raycheff Services Limited | Transport & logistics | 2013 |
| RB Cinematography Limited | Information & communication | 2026 |
| RB Estate Management Ltd | Construction | 2024 |
| RB Refurbishment Ltd | Construction | 2019 |
| RCS Recycling Ltd | Information & communication | 2004 |
| RCS Travel Ltd | Administrative & support | 2022 |
| Rcvp Helston Lane Development Ltd | Health & social care | 2015 |
| Rcvp Retirement Living Ltd | Health & social care | 2015 |
| Rcvp Retirement Living Midco Ltd | Health & social care | 2015 |
| RD Financial Recruitment Limited | Administrative & support | 2002 |
| RDF Carpets and Flooring Ltd | Wholesale & retail | 2016 |
| Rdss Care Limited | Health & social care | 2009 |
| REA Homes Ltd | Real estate | 2020 |
| Reading Road Residents Management Company Limited | Real estate | 2014 |
| Ready SET Resus UK Ltd | Education | 2026 |
| Ready Steady Bounce Berkshire Ltd | Hospitality | 2024 |
| Real Resource Ltd | Professional & scientific | 2022 |
| Reallyfabcards Limited | Wholesale & retail | 2009 |
| Receptiko AI Ltd | Information & communication | 2026 |
| Recognition House RTM Company Limited | Extraterritorial | 2025 |
| Recurve BIO Ltd | Professional & scientific | 2026 |
| Red Nine Ltd | Information & communication | 2015 |
| Red Sea Management Limited | Information & communication | 2000 |
| Redbear Consultants Limited | Professional & scientific | 2017 |
| Reddstone Consultancy Limited | Professional & scientific | 2025 |
| Reddstone Ltd | Professional & scientific | 2014 |
| Redlands Developments Limited | Real estate | 2019 |
| Redwood Team Limited | Administrative & support | 2026 |
| Redz Hair Design Ltd | Other services | 2017 |
| Reemo Global Trade Ltd | Wholesale & retail | 2024 |
| Regal 3D Studio Ltd | Professional & scientific | 2023 |
| Regal Signature Group Ltd | Administrative & support | 2026 |
| Regent Place Residents Company Limited | Households | 2012 |
| Rehmat Enterprises Ltd | Wholesale & retail | 2021 |
| Reign Inventory Solutions Ltd | Administrative & support | 2017 |
| Reimagine People Development Ltd | Education | 2024 |
| Reinforcer Limited | Construction | 2020 |
| Relevel Limited | Professional & scientific | 2025 |
| Relira Fashion Limited | Wholesale & retail | 2025 |
| Renegade Polo Limited | Transport & logistics | 2024 |
| Renton Developments Ltd | Construction | 2014 |
| Residential 1 Estates Limited | Real estate | 2017 |
| Resilient Properties Ltd | Real estate | 2026 |
| Resonant Media Limited | Information & communication | 2026 |
| Retirement & Care Village Partners Limited | Health & social care | 2010 |
| Retro Plumbing & Heating Ltd | Construction | 2021 |
| Revisio Limited | Information & communication | 2015 |
| Revops Automated Limited | Information & communication | 2018 |
| Reydiant Reality Intuitive Consulting Ltd | Other services | 2022 |
| Reydiant Reality Ltd. | Other services | 2016 |
| Reynolds Contracting Services Ltd | Water & waste | 2025 |
| RF Technical Limited | Professional & scientific | 2020 |
| RG Investments & Development Ltd | Construction | 2019 |
| Rhein Trade & Services Limited | Wholesale & retail | 2016 |
| Rhodes & Associates Ltd | Administrative & support | 2019 |
| Richard Young Consulting Limited | Professional & scientific | 2019 |
| Richards & Miller Ltd | Other services | 2024 |
| Richcolour Limited | Hospitality | 1987 |
| Rickham Limited | Hospitality | 2006 |
| Ricky Hall Grip Services Ltd | Information & communication | 2012 |
| Ridgevale Estates Limited | Construction | 2004 |
| Riff Financial Ltd | Information & communication | 2024 |
| Riise Technologies Ltd | Information & communication | 2023 |
| Rima & RUA Co. Ltd | Wholesale & retail | 2024 |
| Ringtel Limited | Information & communication | 2009 |
| Ripdog Ltd | Information & communication | 2026 |
| Ripplesmere Close Residents Management Company Limited | Households | 2019 |
| Ritaanu Consultancy Services Limited | Information & communication | 2014 |
| Riva Group Ltd | Construction | 2010 |
| River Close(Laleham)Management Company Limited | Households | 1965 |
| River Thames Society | Other services | 1983 |
| Riverbrook Place (Crawley) Management Company Limited | Households | 2022 |
| Riverine Properties Limited | Real estate | 2016 |
| Rivers Edge (Freehold) Company Limited | Households | 2008 |
| Rivers Edge Management Limited | Households | 1990 |
| Riverside Fish & Chip Shop Limited | Hospitality | 2014 |
| Riverway Consulting Limited | Professional & scientific | 2018 |
| Riviera Healthcare Ltd | Health & social care | 2018 |
| RJD London Mayfair Limited | Real estate | 2016 |
| Rjdlm Construction Ltd | Construction | 2018 |
| Rjdlm Crowthorne Ltd | Real estate | 2018 |
| Rjmi Co Limited | Real estate | 2023 |
| Rjmj Associates Limited | Administrative & support | 2015 |
| RK Elegant Group Holding Limited | Financial services | 2023 |
| RK Plastering Ltd | Construction | 2016 |
| RK Plumbing and Heating Services Limited | Construction | 2026 |
| RKC Properties & Investments Ltd | Real estate | 2020 |
| RKD Medilegal Ltd | Health & social care | 2022 |
| RLB Consulting Ltd | Professional & scientific | 2022 |
| RM Cargo Solutions Limited | Transport & logistics | 2021 |
| RMQ Maleimage Ltd | Other services | 2021 |