| Qadria Jilania Developments Limited | Construction | 2012 |
| Qccc Sales Limited | Wholesale & retail | 1991 |
| Qcom Solutions Limited | Construction | 2016 |
| Qotbi Business Solutions Limited | Professional & scientific | 2024 |
| Quadalife Limited | Wholesale & retail | 2025 |
| Quadriga (Colchester) Management Company Limited | Households | 2008 |
| Quantum Strategies Limited | Administrative & support | 2024 |
| Quartz Data Services Limited | Information & communication | 2011 |
| Quay Assets Ltd | Real estate | 2025 |
| Queensbridge (North) Residents Company Limited | Households | 1966 |
| Queensbridge (South) Residents Company Limited | Households | 1966 |
| Quest Group Companies Ltd | Manufacturing | 2021 |
| Quest Joinery Ltd | Construction | 2011 |
| Quick First Class Ltd | Administrative & support | 2022 |
| Quickcarcv Ltd | Information & communication | 2026 |
| Quickgrip Ltd | Wholesale & retail | 2024 |
| Quidry Ltd | Real estate | 2024 |
| Quiently Ltd | Transport & logistics | 2021 |
| Quietroom Limited | Professional & scientific | 2003 |
| Quietroom Trustees Limited | Administrative & support | 2020 |
| R & a Creation Limited | Construction | 2019 |
| R & M Properties (Hemel) Limited | Real estate | 1990 |
| R & P Bar Enterprises Ltd | Hospitality | 2020 |
| R a Motor Services Limited | Wholesale & retail | 1992 |
| R COX Building Services Ltd | Construction | 2020 |
| R Daly Construction Ltd | Construction | 2017 |
| R F H Services Limited | Manufacturing | 2017 |
| R K Carpentry Construction Limited | Construction | 2013 |
| R K Software Development Limited | Information & communication | 2015 |
| R Solution Services Ltd | Construction | 2023 |
| R&A Builders UK Limited | Construction | 2008 |
| R&D Property & Build Admin Support Ltd | Construction | 2025 |
| R&J Tyres Ltd | Wholesale & retail | 2023 |
| R&M Developments (Herts) Limited | Real estate | 2023 |
| R&R Electrics Ltd | Energy | 2010 |
| R&R Plumbing & Heating Services Ltd | Construction | 2015 |
| R&R Print Limited | Wholesale & retail | 2019 |
| R&S Car Service Ltd | Wholesale & retail | 2024 |
| R.C.M. Services Limited | Water & waste | 1995 |
| R.E.Morse Ltd | Administrative & support | 2014 |
| R.J.K. Innovations Limited | Manufacturing | 2001 |
| R.L.K (London) Limited | Construction | 2017 |
| R.M.I.J Ltd | Transport & logistics | 2021 |
| R.R & SON Ltd | Administrative & support | 2021 |
| R.T.A Systems Limited | Information & communication | 2011 |
| R2 Trophies Limited | Other services | 2009 |
| R2RCARE Limited | Information & communication | 2023 |
| R3 Spice Ltd | Hospitality | 2022 |
| Raamp Ltd | Real estate | 2022 |
| Raask Ltd | Administrative & support | 2025 |
| Raban Construction Ltd | Construction | 2018 |
| Rackpro Installations Limited | Manufacturing | 2013 |
| Racksafe Installation Solutions Limited | Professional & scientific | 2009 |
| Racksafe Limited | Professional & scientific | 2009 |
| Radford Semele (BH) Management Limited | Households | 2016 |
| Radhakrishna Nivas Limited | Real estate | 2025 |
| Radiance Management Company Limited | Households | 2003 |
| Raebarn House Residents Management Company Limited | Households | 2007 |
| Rafol Trading Ltd | Wholesale & retail | 2023 |
| Ragma Care Ltd | Health & social care | 2016 |
| Ragna Trans UK Ltd | Transport & logistics | 2022 |
| Ragna Vertex Ltd | Financial services | 2025 |
| Rahmir Cleaning Ltd | Administrative & support | 2025 |
| Raid AI Limited | Information & communication | 2026 |
| Rail Investment Ltd | Construction | 2022 |
| Railey Projects Limited | Wholesale & retail | 2009 |
| Rails Fitness Ltd | Arts & recreation | 2024 |
| Rain Construction Ltd | Other services | 2018 |
| Rain Technology Research Limited | Information & communication | 2016 |
| Raisetheground Ltd | Construction | 2024 |
| RAJ (Apsley) Ltd | Wholesale & retail | 2014 |
| Rajakaruna Ltd | Real estate | 2023 |
| Rakhra Systems Ltd | Information & communication | 1996 |
| Rall Properties Ltd | Real estate | 2017 |
| RAM Rental & Automotive Management Ltd | Administrative & support | 2020 |
| Ramdev Trading UK Ltd | Wholesale & retail | 2025 |
| Ranchan Wealth Ltd | Financial services | 2022 |
| Randall Fields Residents Management Company Limited | Households | 2026 |
| Randall Way (Chesham) Management Company Limited | Households | 2018 |
| Ranevifx Limited | Information & communication | 2024 |
| Range Chicken Ltd | Hospitality | 2020 |
| Ranya 1 Express Ltd | Wholesale & retail | 2025 |
| Rapid Grow Ltd | Transport & logistics | 2024 |
| Rapid Rinse Drainage & Guttering Ltd | Construction | 2024 |
| Rapidfix Electric Limited | Wholesale & retail | 2026 |
| Raptortech Recruitment Ltd | Administrative & support | 2020 |
| Rare Iron Limited | Wholesale & retail | 2026 |
| RAS Electrical Limited | Construction | 2021 |
| Raspbery Local Ltd | Wholesale & retail | 2017 |
| Ratchford Building Services Limited | Construction | 2020 |
| Rathbone Market Management Company Limited | Extraterritorial | 2011 |
| Rathmor Investments Ltd | Real estate | 2005 |
| Rathmoyle Investments Ltd | Real estate | 2019 |
| Raubenheimer Limited | Construction | 2026 |
| RAV Associates Limited | Financial services | 2016 |
| Ravalco Holdings Ltd | Financial services | 2024 |
| Ravalco Investments Ltd | Real estate | 2021 |
| Ravalco Ltd | Financial services | 2018 |
| Rave Technologies (UK) Limited | Administrative & support | 1994 |
| Ravello Group Holdings Ltd | Professional & scientific | 2023 |