| Quintinhas Ltd | Administrative & support | 2012 |
| Quinton Investment Holdings Limited | Financial services | 2019 |
| Quotall (IS) Ltd | Financial services | 2023 |
| Quotall Ltd | Information & communication | 2010 |
| QW Holdings Ltd | Financial services | 2023 |
| Qwikflipzter Ltd | Wholesale & retail | 2024 |
| R & BA Music Limited | Information & communication | 1988 |
| R & D Culkin Ltd | Information & communication | 2025 |
| R & J Business Consultants UK Limited | Professional & scientific | 2023 |
| R & M Bushey Limited | Real estate | 2019 |
| R & M Creative Solutions Ltd | Professional & scientific | 2025 |
| R & R Brothers Ltd | Real estate | 2010 |
| R & U Properties Limited | Real estate | 2020 |
| R & V Singh Property Investments Ltd | Real estate | 2020 |
| R a London Store Ltd | Wholesale & retail | 2025 |
| R and B Cabling Limited | Construction | 2026 |
| R B Cleaning & Maintenance Limited | Administrative & support | 2026 |
| R C Wealth Ltd | Financial services | 2020 |
| R Cloud Solutions Ltd | Information & communication | 2020 |
| R Consulting Limited | Information & communication | 2012 |
| R Craft Construction Ltd | Construction | 2024 |
| R Cresswell Consulting Limited | Professional & scientific | 2019 |
| R G Kensington Management Company Limited | Households | 1996 |
| R J Bembridge Ltd | Professional & scientific | 2013 |
| R J Bishop Solutions Ltd | Construction | 2019 |
| R J S Productions Limited | Administrative & support | 2003 |
| R K Technology & Consulting Limited | Information & communication | 2017 |
| R L Rentals Ltd | Administrative & support | 2024 |
| R Majeed Ltd | Real estate | 2012 |
| R Property Group Investments Ltd | Real estate | 2025 |
| R Rama Ltd | Construction | 2022 |
| R&A Carpenters Ltd | Construction | 2022 |
| R&C Properties (Watford) Ltd | Real estate | 2025 |
| R&D Herts Cars Ltd | Transport & logistics | 2026 |
| R&F Maintenance Ltd | Construction | 2026 |
| R&J Construction Consultants Ltd | Construction | 2021 |
| R&J Liquor Limited | Wholesale & retail | 2024 |
| R&K Walsh Entertainment Limited | Hospitality | 2025 |
| R&L Electrical Ltd | Construction | 2025 |
| R&M Plywood Ltd | Wholesale & retail | 2026 |
| R&M Trading Ltd | Wholesale & retail | 2016 |
| R&R Houses Ltd | Real estate | 2018 |
| R&R Nexus Ltd | Hospitality | 2024 |
| R&S Homes and Investments Ltd | Real estate | 2023 |
| R-Meen Property One Limited | Real estate | 2024 |
| R. & W. Estates (Buxton) Limited | Construction | 1972 |
| R.C. Warren Packers Limited | Administrative & support | 1983 |
| R.C.Futcher Limited | Wholesale & retail | 1960 |
| R.Fentons Ltd | Manufacturing | 2023 |
| R.G Dance LLP | | 2016 |
| R.Hamilton & Co. Limited | Manufacturing | 1968 |
| R.M Marlin Ltd | Real estate | 2019 |
| R.M.Almanza Engineering Ltd | Professional & scientific | 2015 |
| R.M.D. Enterprises Limited | Health & social care | 1990 |
| R.T.K Clothing Limited | Wholesale & retail | 2018 |
| R2 Electrical Projects Ltd | Construction | 2023 |
| R2D Consulting Ltd | Information & communication | 2025 |
| R4R Home Care Service Ltd | Health & social care | 2010 |
| RA Dines Ltd | Hospitality | 2025 |
| RA Feather Engineering Ltd | Construction | 2016 |
| RA Horton Services Ltd | Information & communication | 2023 |
| RA Performance Ltd | Wholesale & retail | 2025 |
| RA Quick FIX Limited | Professional & scientific | 2023 |
| Raabanya Limited | Hospitality | 2019 |
| Raadata Ltd | Administrative & support | 2023 |
| Raas Pro Nutrition Limited | Wholesale & retail | 2023 |
| Raasa Ltd | Transport & logistics | 2024 |
| RAB Construction (London) Ltd | Construction | 2021 |
| Racal Acoustics Holdings Ltd | Extraterritorial | 2021 |
| Rach & STU Ltd | Real estate | 2026 |
| Rachael Reynolds School of Dance Ltd | Arts & recreation | 2019 |
| Racheal Benson Ltd | Health & social care | 2024 |
| Racing Room Ltd | Information & communication | 2019 |
| RAD Data Communications Limited | Professional & scientific | 1986 |
| Radcon Limited | Construction | 2023 |
| Radek Service Ltd | Transport & logistics | 2023 |
| Radha Consultancy Ltd | Professional & scientific | 2021 |
| Radha Holdings Ltd | Health & social care | 2025 |
| Radha Krishna Care Centre Ltd | Health & social care | 2025 |
| Radha Krishna Care Homes Ltd | Health & social care | 2025 |
| Radhus Property Group Ltd | Real estate | 2024 |
| Radial Resourcing Limited | Information & communication | 2020 |
| Radient Grace Ltd | Real estate | 2023 |
| Radlett Estate Agents Limited | Real estate | 2005 |
| Radlett Group Limited | Financial services | 2018 |
| Radox Consultancy Ltd | Administrative & support | 2017 |
| Radu Building Services Ltd | Construction | 2022 |
| Raer Consulting Ltd | Construction | 2025 |
| Rafaela Florist Limited | Wholesale & retail | 2023 |
| Rafael’S Closet Ltd | Wholesale & retail | 2025 |
| Raffasorano Limited | Wholesale & retail | 2025 |
| Rafsum Property Management Ltd | Real estate | 2024 |
| Raft Furniture Limited | Wholesale & retail | 2008 |
| Raft Investment Limited | Professional & scientific | 2004 |
| Raft Limited | Wholesale & retail | 1999 |
| RAG Table Games Ltd | Arts & recreation | 2011 |
| Raggo Ltd | Professional & scientific | 2019 |
| Raglan (Caterham) Limited | Real estate | 1999 |
| Raglan M & E Ltd | Construction | 2019 |
| Raglan Property LLP | | 2016 |