| Quandon Records Ltd | Information & communication | 2026 |
| Quantum Art Ltd | Wholesale & retail | 2012 |
| Quattro Hygiene Group Ltd | Wholesale & retail | 2017 |
| Qubay Ltd | Health & social care | 2022 |
| Queen of the Rushes Ltd | Information & communication | 2018 |
| Queens Road (Block F) Management Company Limited | Households | 1987 |
| Queensbridge Developments Limited | Manufacturing | 1999 |
| Queensbury (Ardmore Lane) Residents Association Limited | Households | 1969 |
| Quick Mechanical Ltd | Wholesale & retail | 2025 |
| Quick Pick ME UP Recovery Ltd | Wholesale & retail | 2025 |
| Quick Wears Limited | Manufacturing | 2026 |
| Quickwash Express Limited | Other services | 2025 |
| Quid Analytics Consulting Ltd | Wholesale & retail | 2022 |
| Quikcloud Ltd | Information & communication | 2016 |
| Quintessence Medical Group Ltd | Health & social care | 2026 |
| Quintinite Limited | Other services | 2021 |
| R & a Building & Maintenance Ltd | Households | 2023 |
| R & S IT Services Ltd | Transport & logistics | 2021 |
| R & S Tradelink Limited | Other services | 2016 |
| R - One Commodity Group Limited | Other services | 2023 |
| R a K Medicals Ltd | Health & social care | 2015 |
| R and M Boxing Ltd | Arts & recreation | 2024 |
| R HOY Building Services Ltd | Construction | 2023 |
| R Johnson Jointing Limited | Construction | 1997 |
| R L Harrison Construction Services Limited | Construction | 2018 |
| R Richie Ltd | Health & social care | 2025 |
| R&B Home Developments Ltd | Construction | 2021 |
| R&J Direct Ltd | Wholesale & retail | 2025 |
| R&M Lawson Ltd | Real estate | 2025 |
| R.A.B Site Management Limited | Construction | 2012 |
| R.A.S Design Ltd | Manufacturing | 2022 |
| R.A.S.S.A Ltd | Hospitality | 2020 |
| R.A.W Build Ltd | Construction | 2025 |
| R.Art Marketing Ltd | Construction | 2020 |
| R.B. Whitbread (Plant Hire) Limited | Construction | 1978 |
| R.G.D Carpentry and Flooring Ltd | Construction | 2018 |
| R.J. King (Cabinets) Limited | Real estate | 1974 |
| R.Nichols Roofing & Maintenance Ltd | Construction | 2026 |
| R1 GAS Limited | Construction | 2020 |
| R3LIEVE Ltd | Public administration | 2019 |
| RA Consulting London Ltd | Professional & scientific | 2025 |
| RAB Security Services Ltd | Administrative & support | 2020 |
| Rada by Bhakti Ltd | Other services | 2024 |
| Radah Services Ltd | Real estate | 2025 |
| Radhey Beauty Ltd | Other services | 2025 |
| Radiance Limited | Health & social care | 2025 |
| Radiant UW Ltd | Financial services | 2025 |
| Radius Interiors Ltd | Construction | 2019 |
| Radlett Construction Ltd | Construction | 2021 |
| Radnur Limited | Real estate | 2021 |
| RAE Healthcare Ltd. | Health & social care | 2016 |
| Rafi Security Installations Ltd | Construction | 2022 |
| Rage Ltd | Administrative & support | 2022 |
| RAH Consultancy Services Ltd | Financial services | 2025 |
| Rail & Metro Communications Limited | Information & communication | 2011 |
| Rail Consultants Ltd | Professional & scientific | 2025 |
| Rail Euro Consulting Ltd | Construction | 2014 |
| Railsafe Holdings Ltd | Financial services | 2023 |
| Rain Midrara Supporting Hands Ltd | Education | 2019 |
| Rainbow & Co Property Ltd | Real estate | 2024 |
| Rainbow Chalk Markers Limited | Wholesale & retail | 1994 |
| Rainbow Children's Corner Ltd. | Arts & recreation | 2020 |
| Rainbow Printing Solution Ltd | Manufacturing | 2025 |
| Rainbow Services (Harlow) | Hospitality | 1999 |
| Rainbow Whipping Limited | Manufacturing | 2023 |
| Rainbow's Holding Limited | Hospitality | 2022 |
| Raissa Sheikh Consultants Limited | Other services | 2015 |
| RAJ Lodge Spice Ltd | Hospitality | 2025 |
| Raja MS Ltd | Professional & scientific | 2023 |
| Raleigh Holt (Barnstaple) Management Company Limited | Real estate | 2019 |
| Ralyconsttransserv Ltd | Construction | 2019 |
| Ramblers Gate Management Company Limited | Households | 2017 |
| Rami Homes Ltd | Real estate | 2023 |
| Ramirah Limited | Professional & scientific | 2023 |
| Ramirah Rana Limited | Information & communication | 2025 |
| Rams Carpentry Ltd | Manufacturing | 2021 |
| Ramsden Roofing Ltd | Construction | 2026 |
| Rangeunit Property Management Limited | Households | 1988 |
| Rania Food Services Ltd | Manufacturing | 2025 |
| RANKED4U Ltd | Information & communication | 2024 |
| Ranktix Digital Limited | Wholesale & retail | 2026 |
| Ransey Ltd | Health & social care | 2023 |
| Raphvin Limited | Real estate | 2015 |
| Rapid Cars Ltd | Transport & logistics | 2023 |
| Rapidsource Capital Holdings Limited | Real estate | 2025 |
| Rapidsource IT Limited | Information & communication | 2001 |
| Rapidsource Property Limited | Financial services | 2025 |
| RAR Partners Limited | Hospitality | 2022 |
| Rata Consulting Ltd | Professional & scientific | 2024 |
| Ravewise Official Ltd | Wholesale & retail | 2025 |
| Ravi Bhuva Limited | Information & communication | 2019 |
| RAW Events Ltd | Administrative & support | 2013 |
| Rawfields Organic Ltd | Wholesale & retail | 2021 |
| RAY Moss Air Tool Services Limited | Wholesale & retail | 1980 |
| Raycab (North) Limited | Professional & scientific | 1970 |
| Raye Partners Limited | Real estate | 2022 |
| Rayjen Care Services Limited | Health & social care | 2021 |
| Raytheon Limited | Professional & scientific | 1993 |
| Raytheon Mena Group Limited | Public administration | 2016 |
| Raytheon Systems Limited | Public administration | 1946 |