| Quantum Flora Limited | Wholesale & retail | 2024 |
| Quantum Group (Management) Limited | Construction | 2011 |
| Quantum Group (QG Corporation UK) Ltd | Professional & scientific | 2016 |
| Quantum Group Holdings Ltd | Professional & scientific | 2016 |
| Quantum Hold Co Ltd | Financial services | 2025 |
| Quantum Homes Holdings Limited | Financial services | 2007 |
| Quantum Homes Limited | Construction | 1999 |
| Quantum Land Group LLP | | 2025 |
| Quantum Projects (Southern) Ltd | Administrative & support | 2020 |
| Quantum Smart Solutions Limited | Wholesale & retail | 2019 |
| Quantum Swansea LLP | | 2013 |
| Quantum Travel Services Ltd | Transport & logistics | 2023 |
| Quantum Universal Academy Ltd | Information & communication | 2024 |
| Quantumtrader Ltd | Professional & scientific | 2014 |
| Quaph Consulting Limited | Administrative & support | 2010 |
| Quaph Holdings Limited | Professional & scientific | 2020 |
| Quarry Chase Management Limited | Households | 1984 |
| Quarterdeck Freehold Limited | Households | 2016 |
| Quay Charters Ltd | Transport & logistics | 2026 |
| Quay Hospitality Group Ltd | Administrative & support | 2019 |
| Quay Properties (International) Ltd | Real estate | 2018 |
| Quay Properties Southampton Ltd | Real estate | 2021 |
| Quay Sails (Poole) Limited | Manufacturing | 1980 |
| Quayside Surgical Services Ltd | Health & social care | 2019 |
| Quayvo Ltd | Real estate | 2024 |
| Qube Group Ltd | Information & communication | 2020 |
| Queens Court (New Milton) Residents Association Limited | Households | 1975 |
| Queens Estates Limited | Real estate | 2017 |
| Queens Park Brickwork Limited | Construction | 2010 |
| Queens Park Cars Ltd | Wholesale & retail | 2018 |
| Queens Park Court Freehold Limited | Households | 2011 |
| Queens Park Dental Team Limited | Health & social care | 2010 |
| Queens Park Gardens RTM Company Limited | Households | 2004 |
| Queens Park Ladies Limited | Education | 2020 |
| Queens Park Limited | Real estate | 2017 |
| Queens Park Lodge Limited | Households | 2004 |
| Queensbury Mansions Freehold Limited | Real estate | 2023 |
| QUEST365 Ltd | Professional & scientific | 2018 |
| Quick FIX IT Ltd | Wholesale & retail | 2021 |
| Quick Trade Direct Ltd | Transport & logistics | 2025 |
| Quickbrit Media Ltd | Real estate | 2014 |
| Quid Pro QUO Media Ltd | Professional & scientific | 2023 |
| Quid Pro QUO Properties Limited | Real estate | 2024 |
| Quidproquo Trading Ltd | Other services | 2017 |
| Quieter Limited | Wholesale & retail | 2025 |
| Quinn & Co. Estate & Letting Agents Limited | Real estate | 2007 |
| Quinn and Co Letting Agents (Bournemouth) Limited | Real estate | 2010 |
| Quintonward Limited | Manufacturing | 2000 |
| Quirky Analytics Ltd | Information & communication | 2025 |
| Quorumex Ltd | Information & communication | 2022 |
| R & B Cafe Limited | Hospitality | 2008 |
| R & B UK Limited | Health & social care | 1999 |
| R & K Barbers Limited | Other services | 2024 |
| R & R Developments (UK) Limited | Real estate | 2003 |
| R & R Executive Travel Limited | Transport & logistics | 2023 |
| R & R Leisure Limited | Administrative & support | 2017 |
| R & R Post Production Ltd | Information & communication | 2024 |
| R & S Project Management Ltd | Wholesale & retail | 2013 |
| R & S United Plumbing and Heating Ltd | Construction | 2023 |
| R & V Partners Limited | Hospitality | 2011 |
| R Andrews (Quality Meats) Limited | Wholesale & retail | 2005 |
| R J Biggs & Sons Ltd | Construction | 2002 |
| R J Mcgowan Associates Limited | Professional & scientific | 2002 |
| R M Creations Limited | Other services | 2015 |
| R M Vision Security Ltd | Administrative & support | 2023 |
| R Mart Ltd | Wholesale & retail | 2026 |
| R P Generators Ltd | Manufacturing | 2016 |
| R Simmons Consultancy Ltd | Professional & scientific | 2018 |
| R&B Autos (Bmth) Limited | Wholesale & retail | 2011 |
| R&B Retail Ltd | Wholesale & retail | 2025 |
| R&D Maintenance Ltd | Construction | 2025 |
| R&L Motorcycles Ltd | Wholesale & retail | 2024 |
| R&Mk Ltd | Households | 2024 |
| R&R Quality Car Sales Ltd | Wholesale & retail | 2025 |
| R&Sma Limited | Hospitality | 2026 |
| R. D. Hawkins Consultancy Ltd | Manufacturing | 2022 |
| R. J. Carpentry (Dorset) Limited | Construction | 2003 |
| R. J. S. Louristone Ltd. | Financial services | 2002 |
| R.A.M Drains Limited | Water & waste | 2025 |
| R.A.W. Services Limited | Manufacturing | 2003 |
| R.Crumbleholme & SON Limited | Wholesale & retail | 1947 |
| R.H Land & Property Ltd | Real estate | 2026 |
| R.I.S.E Support and Excellence Ltd | Education | 2026 |
| R.L Marine Laminating Ltd | Manufacturing | 2022 |
| R.M.S.N Limited | Real estate | 2024 |
| R.S. Global Project Ltd | Manufacturing | 2023 |
| R.T. Johns Building Services Ltd. | Other services | 1998 |
| R.W. Radford Electrical Limited | Extraterritorial | 1995 |
| R1 Barbers Limited | Other services | 2024 |
| R13 Transport Limited | Transport & logistics | 2025 |
| R1SE Therapy Ltd | Other services | 2025 |
| R2GARNER Ltd | Professional & scientific | 2024 |
| R2TF Limited | Information & communication | 2026 |
| R87 Consulting Limited | Information & communication | 2018 |
| RA ENT. Limited | Manufacturing | 2001 |
| RA Malmesbury Limited | Wholesale & retail | 2015 |
| RA Pubs & Bars Ltd | Hospitality | 2025 |
| Raashco Limited | Real estate | 2020 |
| Racer Pictures Ltd | Information & communication | 2021 |
| Rachel Roberts Viola Limited | Arts & recreation | 2017 |