| Reform Systems Ltd | Professional & scientific | 2014 |
| Regalz Limited | Extraterritorial | 2016 |
| Reggie Limited | Health & social care | 2012 |
| Regulatory Advice Limited | Professional & scientific | 2019 |
| REH Electrical Solutions Limited | Construction | 2016 |
| Rehoboth Children's Services Ltd | Public administration | 2023 |
| Rehoboth Management Limited | Real estate | 2018 |
| Reina Concierge Ltd | Administrative & support | 2020 |
| Relliance Property Investment Ltd | Real estate | 2019 |
| Relliance Healthcare Limited | Health & social care | 2010 |
| Renthub Properties Ltd | Real estate | 2025 |
| Rentpe Limited | Information & communication | 2024 |
| Repair and Maintenance Plans Limited | Administrative & support | 2017 |
| Repossession Bailout Ltd | Real estate | 2019 |
| Reset Electrical Co. Ltd | Construction | 2020 |
| Residents of Greenlawns Management Limited | Households | 1983 |
| Response Business Finance Limited | Extraterritorial | 2018 |
| Retale Limited | Wholesale & retail | 2020 |
| Retouch and Post Ltd | Professional & scientific | 2010 |
| Reva Lash and Brow Ltd | Other services | 2023 |
| Reveart Limited | Professional & scientific | 2025 |
| Reverie Autos Ltd | Wholesale & retail | 2014 |
| Revive Autospares Ltd | Wholesale & retail | 2025 |
| Rggr Construction Limited | Construction | 2023 |
| Rhehan Trading Limited | Information & communication | 2025 |
| Rhematech Homes Projects Limited | Real estate | 2024 |
| Rhematech Projects Limited | Construction | 2021 |
| Rhoi Limited | Health & social care | 2023 |
| Rhonda Wootten Consulting Ltd | Professional & scientific | 2007 |
| Riahnity Compliance Solutions Ltd | Financial services | 2025 |
| Richard Morton Architects Ltd | Professional & scientific | 2012 |
| Rickserv Limited | Construction | 2013 |
| Ride Noww Ltd | Transport & logistics | 2023 |
| Rider Construction Ltd | Construction | 2024 |
| Ridge Industrial Services Limited | Manufacturing | 2022 |
| Ridgeway Court (Stanmore) Freehold Limited | Households | 2013 |
| Ridlaz (UK) Limited | Households | 2024 |
| Rielle Group Ltd | Real estate | 2024 |
| Rihanna Limited | Education | 2022 |
| Rimi Building Ltd | Construction | 2022 |
| Ripeshare Ltd | Real estate | 2014 |
| Rishalax Ltd | Professional & scientific | 2025 |
| Rishi Housing Ltd | Real estate | 2025 |
| Risk Response Holdings Ltd | Real estate | 2017 |
| Risk Response Management Limited | Administrative & support | 2010 |
| Riva Consultancy Limited | Professional & scientific | 2019 |
| Rixus Ltd | Information & communication | 2017 |
| RJD Saxon Limited | Real estate | 2014 |
| RJK Foods Ltd | Professional & scientific | 2023 |
| RK Lubricants Ltd | Wholesale & retail | 2025 |
| RK Success IT Limited | Information & communication | 2024 |
| Rkdigitalinfra Limited | Information & communication | 2025 |
| RM Renewable Energy Solutions Ltd | Construction | 2024 |
| RM Risk Solutions Ltd | Financial services | 2026 |
| RM Services (Herts) Limited | Construction | 2018 |
| RMP Invest Limited | Real estate | 2020 |
| Robert Samuel Associates Limited | Financial services | 2020 |
| Roberts 21ST Century Design Limited | Construction | 2008 |
| Robhul Ltd | Transport & logistics | 2025 |
| Robi BIZ Drywall Ltd | Construction | 2017 |
| Robinia Property Services Ltd | Administrative & support | 2018 |
| Robotechai Ltd | Information & communication | 2023 |
| Rock Heritage Consultancy Ltd | Information & communication | 2009 |
| Rockabye Babysitters London Ltd | Other services | 2020 |
| Rockhurst Investments Limited | Real estate | 2018 |
| Rockstar Transport Ltd | Transport & logistics | 2025 |
| Rockwell Homes Limited | Construction | 2014 |
| Rockwell London Limited | Construction | 2010 |
| Rockwell London Number Eight Limited | Construction | 2022 |
| Rockwell New Homes Limited | Construction | 2026 |
| Rodney Mcnamee Limited | Construction | 2014 |
| Rody International Transport Ltd | Transport & logistics | 2024 |
| Rofooduk Ltd | Wholesale & retail | 2016 |
| Rogers Walk (Freehold) Limited | Real estate | 2018 |
| Roiza Ltd | Wholesale & retail | 2025 |
| Romania Art Sound Ltd | Wholesale & retail | 2020 |
| Romanian Artists Association in the UK CIC | Information & communication | 2021 |
| Romanoff Foundation | Health & social care | 1994 |
| Romax Construction Ltd | Construction | 2010 |
| Ronatec Limited | Professional & scientific | 2024 |
| Roomy Group Holdings Limited | Real estate | 2026 |
| Roomy Group Limited | Real estate | 2023 |
| Rophe Holdings Limited | Wholesale & retail | 2020 |
| Rose & Associates Limited | Professional & scientific | 2014 |
| Rose Chris Group Ltd | Wholesale & retail | 2026 |
| Roses&Co Limited | Wholesale & retail | 2025 |
| Rosewood Tree Care Ltd | Administrative & support | 2025 |
| Roshi's Food Story Limited | Hospitality | 2025 |
| Roxxee Couture Limited | Wholesale & retail | 2024 |
| Roxy Laing Limited | Professional & scientific | 2000 |
| ROY Joseph & Company Limited | Professional & scientific | 2005 |
| Royalle Reign Properties Ltd | Real estate | 2018 |
| Royse Wellbeing Limited | Health & social care | 2020 |
| RP Walton Limited | Information & communication | 2016 |
| RQ Logistics Limited | Transport & logistics | 2025 |
| RR Gadgets Ltd | Wholesale & retail | 2019 |
| RR Surveying SOL Limited | Construction | 2019 |
| RRM Regal House Limited | Real estate | 2024 |
| RSA Lettings Limited | Real estate | 2023 |
| RSL Engineering Limited | Manufacturing | 2008 |