| Refined Building & Roofing Ltd | Construction | 2023 |
| Reflect Digital Limited | Information & communication | 2011 |
| Reflect Hypnotherapy Ltd | Health & social care | 2020 |
| Reflex Capital LLP | | 2010 |
| Regal Flavours Bexleyheath Ltd | Wholesale & retail | 2024 |
| Regal Flavours Ltd | Wholesale & retail | 2015 |
| Regal Plates Limited | Wholesale & retail | 2011 |
| Regency CM Limited | Real estate | 2026 |
| Regency Flows Ltd | Information & communication | 2026 |
| Regency Radio Ltd | Information & communication | 2021 |
| Regional Improvements Ltd | Administrative & support | 2009 |
| Regional Property Auctions Limited | Extraterritorial | 1989 |
| Regional Property Services Limited | Administrative & support | 1989 |
| Regis Spice Ltd | Hospitality | 2019 |
| Rehab on the Go Ltd | Health & social care | 2023 |
| Reignite Plumbing Services Limited | Construction | 2025 |
| Reintal Ltd | Construction | 2019 |
| Reisa Services Limited | Construction | 2025 |
| Reja Restaurants Ltd | Hospitality | 2022 |
| Relaxmami Ltd | Education | 2020 |
| Relay Cleaning Services Limited | Administrative & support | 2013 |
| Relentix Football Academy Ltd | Arts & recreation | 2026 |
| Relmart Ltd | Wholesale & retail | 2024 |
| REM Pharma Ltd | Health & social care | 2020 |
| Remake Limited | Real estate | 2002 |
| Remaps UK Ltd | Wholesale & retail | 2009 |
| Remarkable Heating & Cooling Limited | Construction | 2026 |
| Remarkable Remodelling Ltd | Construction | 2021 |
| Remarket Revival Ltd | Wholesale & retail | 2025 |
| Remedi Medispa Limited | Other services | 2019 |
| Remediology (SE) Limited | Construction | 2022 |
| Remfi Ltd | Administrative & support | 2016 |
| REMM786 Ltd | Financial services | 2025 |
| Remote Building Surveys Ltd | Professional & scientific | 2026 |
| Renbrook Limited | Administrative & support | 2022 |
| Renestell Limited | Real estate | 2025 |
| Rennie Property Holdings Limited | Real estate | 2018 |
| Renson Fabrications Limited | Manufacturing | 1994 |
| RENT2RENT Management Ltd | Real estate | 2022 |
| Rental and Management Ltd | Real estate | 2023 |
| Rentcare Ltd | Real estate | 2023 |
| Renuwell Limited | Mining & quarrying | 2025 |
| REP Unity Limited | Wholesale & retail | 2024 |
| Repairmatter Limited | Real estate | 1999 |
| Research-Uk Ltd | Other services | 2016 |
| Resellio Limited | Wholesale & retail | 2026 |
| Reservoir Water Group Limited | Water & waste | 2026 |
| Residential Procurement Services Limited | Construction | 2018 |
| Residents Management Company of Walnut Tree House, Egham Limited(The) | Real estate | 1976 |
| Resiliencefuture Limited | Health & social care | 2023 |
| Resolute Project Services Limited | Administrative & support | 2008 |
| Resolve Compliance Limited | Professional & scientific | 2025 |
| Resolve Risk Limited | Administrative & support | 2014 |
| Resonant Lives Limited | Extraterritorial | 2014 |
| Resourcing & POP UP by Easydine Ltd | Administrative & support | 2023 |
| Restaurant Alexanders Ltd | Hospitality | 2026 |
| Restharrow Recruitment Services Ltd | Administrative & support | 2008 |
| Restoring Hope Therapies Ltd | Health & social care | 2021 |
| Retina Security Systems Limited | Administrative & support | 2016 |
| Retrace Bar Ltd | Hospitality | 2025 |
| Retro Vintage & Unknown Limited | Wholesale & retail | 2025 |
| Retroelectric Limited | Wholesale & retail | 2019 |
| Revenue Management and Pricing International Ltd | Professional & scientific | 2013 |
| Revive and Construct Limited | Construction | 2025 |
| Reviving Interiors Ltd | Wholesale & retail | 2024 |
| Revolution Hair Ltd | Other services | 2010 |
| REVOLUTION2STYLE Ltd | Wholesale & retail | 2025 |
| Reworks Build Limited | Construction | 2023 |
| REX Glass and Glazing Ltd | Construction | 2024 |
| Rexbray Limited | Professional & scientific | 2019 |
| Reynolds Vehicle Services Ltd | Wholesale & retail | 2018 |
| Reyscan Ltd | Professional & scientific | 2026 |
| RGE Recycling Ltd | Wholesale & retail | 2019 |
| RGM Brickwork & Lanscapes Ltd | Construction | 2025 |
| RGM Case Management Ltd | Professional & scientific | 2024 |
| RGM Management Limited | Professional & scientific | 2014 |
| Rgva Ltd | Professional & scientific | 2016 |
| Rhea Bidco Limited | Administrative & support | 2020 |
| Rhea Midco Limited | Administrative & support | 2020 |
| Rhea Topco Limited | Administrative & support | 2020 |
| Rhicon Piling Limited | Construction | 2014 |
| Rhino Home Solutions Ltd | Construction | 2019 |
| Rhoff Ltd | Other services | 2017 |
| RHS Electrical Ltd | Construction | 2024 |
| Rhys Court Teynham Management Company Limited | Households | 2006 |
| Rhys Thomas Roofing Services Ltd | Construction | 2024 |
| RI Foods Ltd | Hospitality | 2022 |
| Ricco Enterprise Ltd | Wholesale & retail | 2022 |
| Rich's Bricks Ltd | Wholesale & retail | 2023 |
| Richard Finn Limited | Administrative & support | 2004 |
| Richard Lewis Electrical Limited | Construction | 2026 |
| Richardson Air Transport (2020) Ltd | Transport & logistics | 2020 |
| Richinrags Ltd | Wholesale & retail | 2025 |
| Richter Consulting Ltd | Information & communication | 2018 |
| Richy's Barbers Limited | Other services | 2025 |
| Rickards Estates and Investments Ltd | Real estate | 2025 |
| Ride DMC Limited | Wholesale & retail | 2010 |
| Ridgeway Developments Limited | Professional & scientific | 2009 |
| Riding Club London Limited | Arts & recreation | 2008 |
| Right Angle Services Limited | Information & communication | 2023 |