| Pro Home Installations Ltd | Other services | 2017 |
| Pro Lofts London Limited | Construction | 2018 |
| Pro Vision EXP Ltd | Administrative & support | 2024 |
| Pro-Solv Maintenance Limited | Administrative & support | 2024 |
| Prochamp Tech Ltd | Information & communication | 2025 |
| Prodigy Firestoppers Ltd | Information & communication | 2017 |
| Prodriver Media Limited | Information & communication | 2009 |
| Product Packshot Limited | Professional & scientific | 2021 |
| Product Pandit Limited | Information & communication | 2020 |
| Product Trade Services Limited | Wholesale & retail | 2008 |
| Professor Claire Hopkins ENT Limited | Health & social care | 2019 |
| Progress Coaching Ltd | Professional & scientific | 2023 |
| Project Ascend Studios Limited | Information & communication | 2026 |
| Promo Catering Limited | Professional & scientific | 2001 |
| Proper Fit Ltd | Arts & recreation | 2020 |
| Properties for Life Ltd | Real estate | 2017 |
| Property Care Services Limited | Construction | 1991 |
| Property Glimpse Ltd | Real estate | 2023 |
| Property Mart London Ltd | Real estate | 2025 |
| Property Services 4U Ltd | Manufacturing | 2025 |
| Property Support Services UK Limited | Administrative & support | 2005 |
| Propertywize Ltd | Real estate | 2019 |
| Propest Bird Control Ltd | Administrative & support | 1995 |
| Proplumbing Team Ltd | Construction | 2026 |
| Proprius Recruitment Limited | Administrative & support | 2004 |
| Props Porter Limited | Real estate | 2017 |
| Prospect Business Park Management Company Limited | Real estate | 1987 |
| Protein Haus ( London) Limited | Manufacturing | 2018 |
| PRP Group Holding Limited | Administrative & support | 2015 |
| PRP Property Developments Limited | Construction | 2016 |
| PRS Flooring & Contracts Limited | Construction | 1999 |
| PS Dent Limited | Wholesale & retail | 2014 |
| PSA Studio Ltd | Professional & scientific | 2013 |
| PSD Scaffolding Services Ltd | Construction | 2023 |
| Psential Ltd | Construction | 2024 |
| PSR Elevator Ltd | Construction | 2022 |
| Pssg Group Limited | Other services | 2015 |
| Psychic Sisters Ltd | Wholesale & retail | 2020 |
| Public Joinery Ltd | Construction | 2023 |
| Puff & Crunch Ltd | Wholesale & retail | 2026 |
| Puff DAD E Vaping Supplies Ltd | Extraterritorial | 2014 |
| Pullman Zinc Limited | Financial services | 2014 |
| Pulse Refrigeration Limited | Manufacturing | 2006 |
| Pulteney Road E18 Freehold Limited | Households | 2026 |
| Puma Real Estate Ltd | Real estate | 2022 |
| Pure Body Limited | Other services | 2011 |
| Pure Body Richmond Limited | Professional & scientific | 2015 |
| Pure Healthcare Group Limited | Administrative & support | 2020 |
| Purely Magic Limited | Manufacturing | 2021 |
| Purple Comms Limited | Information & communication | 2002 |
| Purple HAT Consulting LLP | | 2012 |
| Purple Leasing Limited | Administrative & support | 2016 |
| Purpose Homes Limited | Real estate | 2020 |
| Pursenal LLP | | 2007 |
| Purser Consulting Limited | Information & communication | 2024 |
| Putitonline Limited | Information & communication | 2005 |
| Putitonline Tech Services Ltd | Information & communication | 2019 |
| PVG Limited | Administrative & support | 1999 |
| PWB 23 Ltd | Hospitality | 2023 |
| Pyne Consult Ltd. | Health & social care | 2014 |
| Q.N. (Holdings) Limited | Hospitality | 2014 |
| Q.N. Hotels (Midlands) Limited | Real estate | 2001 |
| Q.N. Hotels (Wrexham) Limited | Hospitality | 2004 |
| Q.N. Hotels Limited | Hospitality | 1993 |
| Q.N. Restaurants Limited | Hospitality | 2014 |
| Qbify Technologies Limited | Information & communication | 2025 |
| QF Property Maintenance Ltd | Construction | 2019 |
| Qfurnitures Ltd | Wholesale & retail | 2025 |
| Qontrac Global Limited | Transport & logistics | 2017 |
| Qoside Ltd | Information & communication | 2026 |
| Qowdhan Language Services Limited | Professional & scientific | 2022 |
| QST Consultancy Ltd | Administrative & support | 2024 |
| Quadient Technologies Holdings UK Limited | Manufacturing | 1985 |
| Quadient Technologies UK Limited | Manufacturing | 1963 |
| Qualified Tutor Ltd | Education | 2020 |
| Qualifixa Ltd | Construction | 2014 |
| Qualis Commercial Ltd | Construction | 2019 |
| Qualis Community CIC | Extraterritorial | 2021 |
| Qualis Group Ltd | Financial services | 2019 |
| Qualis Homes Ltd | Real estate | 2022 |
| Qualis Land Ltd | Real estate | 2023 |
| Qualis Living Ltd | Extraterritorial | 2019 |
| Qualis Management Ltd | Extraterritorial | 2022 |
| Qualis Property Solutions Ltd | Real estate | 2019 |
| Qualiteach Education Group Ltd | Administrative & support | 2023 |
| Qualiteach London Limited | Administrative & support | 2025 |
| Qualiteach Yorkshire Limited | Administrative & support | 2025 |
| Qualitronelle Ltd | Professional & scientific | 2026 |
| Quality Counts Limited | Wholesale & retail | 2009 |
| Quality Craftsmanship Construction Ltd | Construction | 2026 |
| Quantity Management Services London Limited | Professional & scientific | 2024 |
| Quantum Holdings London Ltd | Real estate | 2020 |
| Quasar Computers Limited | Information & communication | 1988 |
| Queenswood Lodge RTM Company Limited | Households | 2011 |
| Quickbuild Labs Ltd | Information & communication | 2026 |
| Quickdrop (Holdco) Limited | Construction | 2016 |
| Quickdrop Limited | Real estate | 2003 |
| Quicknook Limited | Wholesale & retail | 2026 |
| Quiggs Property Services Ltd | Real estate | 2023 |
| Quillpost Limited | Extraterritorial | 2003 |