| PTI Car Park Ltd | Real estate | 2023 |
| PTR Project Engineering Limited | Other services | 2017 |
| Puddle Ducks Franchising Limited | Arts & recreation | 2006 |
| Puddle Ducks Franchising Pools Limited | Wholesale & retail | 2019 |
| Pudlo Power Ltd | Wholesale & retail | 2014 |
| Pudz Desserts Ltd | Hospitality | 2025 |
| PUI Shan Consultancy Limited | Administrative & support | 2015 |
| Pure Communications UK Limited | Information & communication | 2006 |
| Pure Thai Massage Limited | Other services | 2016 |
| Pure Water Window Cleaning Limited | Administrative & support | 2020 |
| Purepkl Ltd | Arts & recreation | 2026 |
| Pureseal Services UK Ltd | Administrative & support | 2020 |
| Purple Giraffe Accountants Ltd | Professional & scientific | 2020 |
| Purple Octopus (Cheshire) Limited | Financial services | 2026 |
| Purplesquare 2022 Ltd | Financial services | 2022 |
| Purplesquare Vehicle Solutions Ltd | Administrative & support | 2022 |
| Purser's Travel LLP | | 2008 |
| Pursuit Collective Ltd | Professional & scientific | 2026 |
| PWB Investments (Sutton) Limited | Real estate | 2021 |
| Pympym Ltd | Transport & logistics | 2021 |
| Pypline Marketing Ltd | Information & communication | 2026 |
| QFS NW LLP | | 2025 |
| Qiro Limited | Transport & logistics | 2019 |
| Qmspharma Limited | Professional & scientific | 2015 |
| Qreports Limited | Information & communication | 1986 |
| QUAESTOR2000 Limited | Wholesale & retail | 2004 |
| Qualcon Engineering Solutions Limited | Professional & scientific | 2018 |
| Qualified Nutrition Limited | Education | 2019 |
| Qualitas Fleet Solutions Limited | Administrative & support | 2020 |
| Quality Controlled Services Limited | Professional & scientific | 1998 |
| Qualkem Limited | Manufacturing | 1971 |
| Quantum Cloud Ltd | Information & communication | 2025 |
| Quantum OBD2 Limited | Wholesale & retail | 2025 |
| QUANTUM11 Limited | Wholesale & retail | 2025 |
| Quartz PUB Company Ltd | Hospitality | 2017 |
| Quesh Ltd | Wholesale & retail | 2009 |
| Quick Car Credit Ltd | Financial services | 2014 |
| Quick Van Finance Limited | Administrative & support | 2025 |
| Quinlans Professionals Group Limited | Construction | 2025 |
| Quinn Consulting Group Limited | Administrative & support | 1998 |
| Quod Scan 3D LLP | | 2013 |
| Quotes Direct Ltd | Information & communication | 2021 |
| QV Oasis Limited | Wholesale & retail | 2024 |
| Qwipnow Ltd | Information & communication | 2026 |
| Qwoman Hub Ltd | Information & communication | 2025 |
| R & L Ward Farms Limited | Manufacturing | 2009 |
| R and J Taylor Ltd | Professional & scientific | 2024 |
| R C Roofing & Property Repairs Limited | Construction | 2011 |
| R D Offshore Limited | Construction | 2012 |
| R Davenport Properties Ltd | Real estate | 2019 |
| R Flanagan Plumbing & Heating Limited | Construction | 2023 |
| R G Marketing Limited | Administrative & support | 2010 |
| R M Abell Spreading Services Limited | Administrative & support | 2007 |
| R M S Industrial Door Services Limited | Manufacturing | 2003 |
| R S Service Centre Limited | Wholesale & retail | 2026 |
| R Taylor Property Group Ltd | Construction | 2025 |
| R&D Ventures Ltd | Real estate | 2019 |
| R. K. Henshall & Co. Limited | Financial services | 1976 |
| R. OWL Piercing Limited | Other services | 2025 |
| R. OWL Tattoo Limited | Other services | 2012 |
| R.A. Wright Limited | Construction | 2003 |
| R.G. Nixon Limited | Administrative & support | 2005 |
| R.M Engineer Ltd | Manufacturing | 2020 |
| R.T.T.S. Limited | Transport & logistics | 1996 |
| R18X Limited | Wholesale & retail | 2005 |
| R1CONSULTANCY Ltd | Transport & logistics | 2019 |
| R3VIVE Clothing Ltd | Wholesale & retail | 2025 |
| R4 Retail LLP | | 2014 |
| RAA Property Ltd | Real estate | 2021 |
| Rabaty Ltd | Wholesale & retail | 2025 |
| RAC Construction and Joinery Ltd | Construction | 2019 |
| Rackcare Limited | Information & communication | 2005 |
| Radcliffe Global Limited | Health & social care | 2021 |
| Radiance Personified Ltd | Other services | 2021 |
| Radiology Imaging Services Ltd | Health & social care | 2024 |
| Radius Business Solutions (UK) Limited | Wholesale & retail | 2017 |
| Radius Business Solutions Bidco Limited | Financial services | 2023 |
| Radius Business Solutions Midco 1 Limited | Financial services | 2023 |
| Radius Business Solutions Midco 2 Limited | Financial services | 2023 |
| Radius Charge Installations Limited | Construction | 2013 |
| Radius Charge Limited | Construction | 2020 |
| Radius Connect Limited | Information & communication | 2020 |
| Radius Energy Limited | Energy | 2018 |
| Radius Insurance Solutions Limited | Financial services | 1998 |
| Radius Limited | Wholesale & retail | 2012 |
| Radius Payment Solutions Bidco Limited | Financial services | 2017 |
| Radius Payment Solutions Limited | Extraterritorial | 2023 |
| Radius Payment Solutions Midco Limited | Financial services | 2017 |
| Radius Payment Solutions Topco Limited | Financial services | 2017 |
| Radius Telematics Limited | Information & communication | 2016 |
| Radius Vehicle Solutions Limited | Administrative & support | 2005 |
| Radius Velos Limited | Other services | 2023 |
| Radomil Zlatev Ltd | Wholesale & retail | 2017 |
| Radwag UK Ltd | Wholesale & retail | 2019 |
| Radway Green Properties Ltd | Construction | 2024 |
| Radwood Developments Limited | Construction | 2003 |
| Rafeeq Enterprise Limited | Professional & scientific | 2023 |
| Rafmag Ltd | Transport & logistics | 2017 |
| Raftrans Limited | Transport & logistics | 2010 |
| RAH Estate Management Limited | Professional & scientific | 2015 |