| Qlearsec Ltd | Administrative & support | 2025 |
| Qlink Networks Ltd | Information & communication | 2023 |
| QR Equity Limited | Households | 2018 |
| QT & Partners Ltd | Wholesale & retail | 2022 |
| Qualflow Limited | Wholesale & retail | 2021 |
| Quality Care Cover Limited | Administrative & support | 2015 |
| Quality Woodwork Limited | Manufacturing | 2024 |
| Quantity Survey Ltd | Professional & scientific | 2015 |
| Quantum 6 Limited | Construction | 2015 |
| Quantum Consilium Limited | Administrative & support | 2025 |
| Quantum Offshore Limited | Manufacturing | 1991 |
| Quantum Steps Learning Ltd | Education | 2026 |
| Quarry Wood Estates Limited | Construction | 2017 |
| Quarterm Limited | Real estate | 2021 |
| Quatro Building Contracting UK Limited | Construction | 2021 |
| Qubii Limited | Professional & scientific | 2016 |
| Queens Court (Richmond) Freehold Limited | Other services | 2013 |
| Quercus Robur Advisors Limited | Administrative & support | 2025 |
| Questas Consulting Ltd | Professional & scientific | 2002 |
| Quickmile Limited | Real estate | 2015 |
| Quidsia Al-Noor Aesthetics Ltd | Other services | 2025 |
| Quietspeed Ltd | Administrative & support | 2017 |
| Quilibra Ltd | Professional & scientific | 2008 |
| Quilombo UK Community Interest Company | Education | 2021 |
| Quincunx Limited | Professional & scientific | 2023 |
| Quip Shed Productions Ltd | Arts & recreation | 2023 |
| Quovix Ltd | Wholesale & retail | 2025 |
| R Adey Builders Limited | Construction | 2014 |
| R E H O Electric Slide Services Limited | Construction | 2025 |
| R J Business Consultancy Limited | Professional & scientific | 2024 |
| R J Haynes Consulting Limited | Professional & scientific | 2011 |
| R S Consultancy Limited | Administrative & support | 1995 |
| R Taylor Painting Limited | Construction | 2024 |
| R Teesquare UK Ltd | Wholesale & retail | 2022 |
| R Wedd Consulting Ltd | Professional & scientific | 2019 |
| R&J Traders Limited | Hospitality | 2019 |
| R&M Educ Ltd | Professional & scientific | 2022 |
| R-Iva Intermediary Ltd | Extraterritorial | 2016 |
| R.K.Infosys Ltd | Professional & scientific | 2025 |
| RA First UK Ltd | Professional & scientific | 2018 |
| Raban (Fitzroy) Limited | Construction | 2006 |
| Raban (Labour Club) Limited | Real estate | 2006 |
| Raban (Wellington) Limited | Real estate | 2005 |
| Raban Developments Ltd | Construction | 2005 |
| Raban Goodhall Limited | Real estate | 2011 |
| Raban Holdings Limited | Real estate | 2006 |
| Raban Limited | Real estate | 2005 |
| Raban Management Limited | Real estate | 2011 |
| Rachel Whittle Ltd | Administrative & support | 2009 |
| Rachita Kapoor Casting Ltd | Administrative & support | 2015 |
| Racketscience Ltd | Education | 2023 |
| Radhi Kalila Property Management Ltd | Real estate | 2020 |
| Radiant Insulation Co. Limited | Construction | 1982 |
| Radio Unklaren Ltd | Arts & recreation | 2018 |
| Radius Tech Limited | Professional & scientific | 2005 |
| Radler B Dissolved LP | | 2023 |
| Rafiki Hospitality Limited | Professional & scientific | 2021 |
| Rail Consulting Limited | Professional & scientific | 2022 |
| Railmind Ltd | Professional & scientific | 2025 |
| Rainmakr Ltd | Professional & scientific | 2019 |
| RAJ Services, Inc. | | 2006 |
| RAJ UK Investment Ltd | Wholesale & retail | 2024 |
| Rajan Design Limited | Manufacturing | 2000 |
| Rajitha Cruz Counselling Ltd | Health & social care | 2024 |
| Rako Ranya Ltd | Other services | 2024 |
| Ralr Developments Limited | Construction | 2017 |
| RAM Investments Limited | Other services | 1997 |
| RAM JAM Records Limited | Arts & recreation | 2017 |
| Ramblin’ Brands UK Limited | Wholesale & retail | 2022 |
| Ramesbarber Limited | Other services | 2019 |
| Rami's Barber Limited | Other services | 2020 |
| Ramos Restaurant Ltd | Hospitality | 2021 |
| RANGDAR1 Ltd | Hospitality | 2022 |
| Rangi Contracts Limited | Financial services | 1995 |
| Ranjman Holdings Limited | Real estate | 2022 |
| Ranjmannine Limited | Real estate | 2022 |
| Ranjmanone Limited | Real estate | 2022 |
| Ranjmanseven Limited | Real estate | 2022 |
| Rase Properties Limited | Real estate | 2021 |
| Rashidi & Co Limited | Financial services | 2017 |
| Raska Limited | Construction | 2014 |
| Rasp Investments Limited | Construction | 2019 |
| Rasuli Trading Ltd | Wholesale & retail | 2023 |
| Ratcliffe Residents Limited | Households | 1996 |
| Ratherpeach Limited | Wholesale & retail | 2024 |
| Rausta Limited | Hospitality | 2016 |
| Raven Wharf Management Limited | Households | 1997 |
| Ravenscroft Electric Ltd | Construction | 2020 |
| Ravenscroft Property Development Limited | Construction | 2009 |
| Ravenside (Surbiton) Residents Association Limited | Households | 1984 |
| Ravensview Court Residents Association Limited | Administrative & support | 1960 |
| RAW Clay Limited | Administrative & support | 2003 |
| RAY Road (West Molesey) Management Company Limited | Households | 2006 |
| RAY Systems Ltd | Professional & scientific | 2024 |
| Razm Ltd | Real estate | 2021 |
| RB Bespoke Cabinet Makers Ltd | Construction | 2018 |
| RB Legacy Properties Ltd | Households | 2023 |
| Rbbr Limited | Information & communication | 2021 |
| RBP Energy Solutions Limited | Energy | 2024 |
| RBW Investments Ltd | Professional & scientific | 2014 |