| R.K. Services Limited | Administrative & support | 2008 |
| R.K. Wealth Ltd | Real estate | 2025 |
| R.Page Concrete Buildings Limited | Construction | 1960 |
| R.S. International Freight Limited | Transport & logistics | 1995 |
| R.W. Kilvington & Company Limited | Construction | 1985 |
| R3S Invest Limited | Real estate | 2016 |
| R71 Limited | Information & communication | 2010 |
| Racketzone Sports Ltd | Arts & recreation | 2025 |
| RAD Development Group Ltd | Real estate | 2025 |
| Rada Tea Ltd | Health & social care | 2019 |
| Raddix London Ltd | Health & social care | 2018 |
| Radiant Professionals Ltd | Other services | 2025 |
| Radikal Provider Ltd | Construction | 2021 |
| Radiology Resident Forum Ltd | Health & social care | 2023 |
| Radsec Infotech Ltd | Information & communication | 2013 |
| Rae-Anne Cohen Limited | Education | 2025 |
| Rafire Consultants Ltd | Public administration | 2021 |
| Ragavai Medco Legal Services Ltd | Professional & scientific | 2021 |
| Rageena Properties Ltd | Real estate | 2024 |
| Rahmns Training Ltd | Education | 2018 |
| Rail Consultancy Services Ltd | Transport & logistics | 2020 |
| Rail Elevate Ltd | Construction | 2025 |
| Railway Software Solutions Ltd | Information & communication | 2025 |
| Rainforest International Ltd | Wholesale & retail | 2025 |
| Rainham Lagging Limited | Administrative & support | 2003 |
| RAJ Admission Consultancy Limited | Other services | 2016 |
| Rajdev Investments Limited | Real estate | 2013 |
| Rajkumarmedia Ltd | Professional & scientific | 2017 |
| Rajushanga UK Ltd | Health & social care | 2026 |
| Rakemoor Limited | Wholesale & retail | 1984 |
| Ralio Healthcare Ltd | Health & social care | 2022 |
| Ralph DUA Limited | Professional & scientific | 2017 |
| RAM Homeshare Ltd | Real estate | 2025 |
| Ramata Property Ltd | Real estate | 2021 |
| Ramsdeane Limited | Information & communication | 2017 |
| Ramsey Portia Ltd | Administrative & support | 2013 |
| Rana Park Limited | Manufacturing | 2002 |
| Randall Contracts Limited | Construction | 2021 |
| Ranees Limited | Wholesale & retail | 2004 |
| Rangemist Limited | Real estate | 2008 |
| Ranked UP Ltd | Extraterritorial | 2023 |
| RAPID1923 Constructions Ltd | Construction | 2023 |
| Rapidglobe Limited | Information & communication | 2005 |
| Raquel Dalama Corbeira Ltd | Health & social care | 2024 |
| Rare Building Construction Ltd | Administrative & support | 2017 |
| Rasa Estates Ltd | Real estate | 2022 |
| Rashwan Medicali Ltd | Health & social care | 2025 |
| Raskan Enterprises Ltd | Hospitality | 2021 |
| Raskan Holdings Ltd | Financial services | 2022 |
| Rastrick Junction Limited | Real estate | 2020 |
| Rated Electrical Contractors Ltd | Construction | 2026 |
| Ravald Property Services Ltd | Real estate | 2019 |
| Ravenscourt Developments Limited | Construction | 2025 |
| Ravi Kumar Construction Ltd | Construction | 2016 |
| RAW Beets Ltd | Hospitality | 2012 |
| RAW Inc Limited | Arts & recreation | 2013 |
| Raybridge Investment Ltd | Real estate | 2025 |
| Raylan Limited | Construction | 2025 |
| Raymond Rose LLP | | 2019 |
| Raynie Days Limited | Wholesale & retail | 2021 |
| RAZ Cladd Installation Ltd | Construction | 2018 |
| RB Garden Supplies Ltd | Wholesale & retail | 2024 |
| RB Print Solutions Limited | Professional & scientific | 2016 |
| RB Property Management Solutions Ltd | Real estate | 2025 |
| RB UK Services Limited | Professional & scientific | 2023 |
| RBR Electrical Ltd | Construction | 2016 |
| RC Locations Ltd | Information & communication | 2023 |
| RCH Analytics Limited | Other services | 2025 |
| RCO Interiors Ltd | Construction | 2024 |
| RD Fire Alarm Installations Limited | Construction | 2016 |
| RD Motors Limited | Wholesale & retail | 2010 |
| RDC Maintenance Ltd | Construction | 2021 |
| RDK Plumbing & Heating Limited | Construction | 2014 |
| RDS Business Solutions Limited | Professional & scientific | 2011 |
| RDS Software Services Ltd | Information & communication | 2025 |
| Re-Think Inside Ltd | Construction | 2023 |
| Reach Global Properties Ltd | Real estate | 2022 |
| Reach Music Ltd | Wholesale & retail | 2023 |
| Reading Independent Financial Services Ltd | Financial services | 2025 |
| Real Dirty Driver Limited | Extraterritorial | 2016 |
| Realux Limited | Construction | 2014 |
| Reason Matinyadze Coperation Ltd | Health & social care | 2021 |
| Reboxit Limited | Water & waste | 1997 |
| Record Producer Program Ltd | Information & communication | 2024 |
| Recycle.Com Ltd | Arts & recreation | 2009 |
| Red Brick Services (FH) Limited | Real estate | 2024 |
| Red Brick Services Limited | Real estate | 2015 |
| Red Contractors Construction Ltd | Construction | 2022 |
| Red Dog Property Management Limited | Real estate | 2016 |
| Red MAC Management Limited | Administrative & support | 2016 |
| Red Point Essex Limited | Administrative & support | 2020 |
| Red Square Scaffolding Limited | Construction | 2021 |
| Red-Team Security Limited | Information & communication | 2001 |
| Redas Consultancy Ltd | Information & communication | 2023 |
| Redbox Analytics Ltd | Professional & scientific | 2017 |
| Redology Limited | Other services | 2025 |
| Redstone Decorators Limited | Administrative & support | 2003 |
| Redwing Security Limited | Energy | 2019 |
| Reebak Limited | Education | 2013 |
| Reece Lipman Films Ltd | Arts & recreation | 2024 |