| PS Realisations (2022) Limited | Construction | 1992 |
| PS Sports & Management Ltd | Arts & recreation | 2013 |
| Pskl Holdings Limited | Real estate | 2023 |
| Pskl Properties Limited | Households | 2026 |
| Psmm Solutions Ltd | Administrative & support | 2023 |
| Pspm Consulting Services Limited | Construction | 2023 |
| PSS (Pets) Limited | Wholesale & retail | 1997 |
| Pstar Consultancy Ltd | Professional & scientific | 2017 |
| Ptbseb Limited | Information & communication | 2016 |
| Public Sector Challenge Ltd | Arts & recreation | 2025 |
| Publishing Solutions Limited | Extraterritorial | 1989 |
| Pucker Project Services Ltd | Professional & scientific | 2019 |
| Pudding Mill Lane LLP | | 2024 |
| Pukka Trukka (Transport) Limited | Information & communication | 2017 |
| Pulse Point Training & Education Ltd | Education | 2025 |
| Pulsepm Ltd | Professional & scientific | 2025 |
| Pumboo Limited | Information & communication | 2011 |
| Pure Aesthetic Clinic Essex Ltd | Other services | 2024 |
| Pure Construction Limited | Construction | 2012 |
| Pure Contracts Limited | Construction | 2025 |
| Pure Energy Plus Limited | Health & social care | 2003 |
| Pure Ingenious Ltd | Wholesale & retail | 2018 |
| Pure Law LLP | | 2008 |
| Purewal Consulting Ltd | Professional & scientific | 2020 |
| Purple Communications UK Limited | Information & communication | 2016 |
| Purple Racing Limited | Information & communication | 1994 |
| Purple Shift Ltd | Administrative & support | 2026 |
| Putney Bridge Road Developments Ltd | Construction | 2008 |
| Puzzlecorp Limited | Professional & scientific | 2020 |
| Pwned Ltd | Wholesale & retail | 2025 |
| Pyjama Properties Limited | Real estate | 2011 |
| Pyper Property Ltd | Real estate | 2004 |
| Pyramids Estates UK LLP | | 2024 |
| Pyramids Properties Limited | Real estate | 2012 |
| PZW Ltd | Professional & scientific | 2023 |
| Q & a Roofing Ltd | Construction | 2017 |
| Q Analytics Ltd | Financial services | 2025 |
| Q MIX Concrete Ltd | Manufacturing | 2021 |
| Q-Power Solutions Limited | Professional & scientific | 2025 |
| Q7 Managing Agencies Limited | Real estate | 2019 |
| QFC Contractors Ltd | Professional & scientific | 1999 |
| Qompete Limited | Construction | 2022 |
| QRT Consultants Ltd | Construction | 2017 |
| Quality Headquarters Limited | Administrative & support | 2004 |
| Quality HR Limited | Extraterritorial | 2012 |
| Quality Screening Limited | Manufacturing | 1977 |
| Quan-An Ltd | Other services | 2017 |
| Quant Security Ltd | Information & communication | 2025 |
| Quantum Electric (UK) Limited | Construction | 2011 |
| Quantum Infotech Ltd | Information & communication | 2019 |
| Quantum Retail Trading Ltd | Wholesale & retail | 2025 |
| Quapro Limited | Wholesale & retail | 2015 |
| Quartum Contracts Limited | Construction | 2026 |
| Quba Foods PVT Ltd | Wholesale & retail | 2025 |
| Queensbridge Capital Ltd | Other services | 2014 |
| Quest Medical UK Holdings Limited | Financial services | 2021 |
| Quest Medical UK Ltd | Professional & scientific | 2009 |
| Quest Meditech Limited | Professional & scientific | 2025 |
| Quest Workforce Solutions Limited | Professional & scientific | 2026 |
| Quick Grab Waste Removal Limited | Water & waste | 2025 |
| QUICKCAB247 Ltd | Transport & logistics | 2026 |
| Quiko UK Ltd | Wholesale & retail | 2019 |
| Quill & INK Limited | Arts & recreation | 2024 |
| Quilters (Colchester) Limited | Hospitality | 1994 |
| Quilters Leisure Limited | Hospitality | 1991 |
| Quimpit Ltd | Professional & scientific | 2011 |
| Quince and Harris Retail Limited | Wholesale & retail | 2015 |
| Quinn & Co Accountancy Limited | Professional & scientific | 2025 |
| Quote My Goods Limited | Wholesale & retail | 2013 |
| R & B Allman Electrical Services Ltd | Construction | 2016 |
| R & B Engineers Ltd | Wholesale & retail | 2009 |
| R & N Metal Recycling Ltd | Water & waste | 2020 |
| R & T Football Tours LLP | | 2023 |
| R and S Carpenters Limited | Construction | 2007 |
| R and S Completion Limited | Manufacturing | 2005 |
| R CAD Design Limited | Administrative & support | 2023 |
| R E Management Consultants Ltd | Construction | 2021 |
| R F Securities LLP | | 2012 |
| R G Thorn Electrical Limited | Construction | 2007 |
| R J Evans Flat Roofing Limited | Construction | 2012 |
| R J L & P M Limited | Real estate | 2004 |
| R Janiszewski Services Limited | Financial services | 2011 |
| R K T H Steel Ltd | Manufacturing | 2018 |
| R Kingsley Construction Ltd | Construction | 2015 |
| R L N Limited | Construction | 2000 |
| R Rose Plumbing and Heating Ltd | Construction | 2024 |
| R Seifert Limited | Professional & scientific | 2024 |
| R T LEE Orthodontics Limited | Health & social care | 2022 |
| R&B Capital Ltd | Real estate | 2025 |
| R&C Electric Ltd | Construction | 2019 |
| R&E LDN Ltd | Other services | 2023 |
| R&M Technologies Limited | Information & communication | 2014 |
| R&R 360 Events Ltd | Arts & recreation | 2022 |
| R. Green Fisheries Limited | Wholesale & retail | 1985 |
| R.B. Sales & Marketing Ltd. | Hospitality | 2003 |
| R.G CAD Design Limited | Information & communication | 2021 |
| R.P.M BKS Limited | Professional & scientific | 2004 |
| R.S.C. Precision Engineering Ltd | Manufacturing | 1978 |
| Raaj Properties Limited | Real estate | 2017 |
| RAB Capital Holdings Limited | Financial services | 2011 |