| P & a Residential Parks Limited | Wholesale & retail | 2013 |
| P & KO Limited | Wholesale & retail | 2018 |
| P & L (Cash Registers) Limited | Information & communication | 1975 |
| P & S Brickwork UK Limited | Construction | 2024 |
| P a Cremin Ltd | Construction | 2015 |
| P J Bunker & Sons Limited | Construction | 2004 |
| P N G Trading Limited | Wholesale & retail | 2017 |
| P Saunders Group Ltd | Construction | 2025 |
| P White & SON Ltd | Construction | 2015 |
| P Wilson Plumbing and Heating Ltd | Construction | 2018 |
| P&D Courier Ltd | Transport & logistics | 2024 |
| P&L Ventures Ltd | Information & communication | 2024 |
| P&S Brickwork Ltd | Construction | 2023 |
| P.D. & Co. (2003) Limited | Professional & scientific | 1998 |
| P.K. Decorators Limited | Construction | 1983 |
| P8S Holdings Ltd. | Financial services | 2025 |
| PAC Supplies Global Limited | Wholesale & retail | 2016 |
| Pace O'Shea Consulting Limited | Professional & scientific | 2013 |
| Pacific Heat (Southern) Limited | Construction | 2013 |
| Pacific Holdings Limited | Real estate | 2020 |
| Page Green Surveyors Limited | Professional & scientific | 2020 |
| Pagham Business Services Limited | Administrative & support | 2013 |
| Paint & Panels Limited | Wholesale & retail | 2024 |
| Painter PAT Ltd | Construction | 2020 |
| Paintperfect Motors Limited | Wholesale & retail | 2020 |
| Paizos Logistics Ltd | Transport & logistics | 2025 |
| Palladium Services Limited | Health & social care | 2007 |
| Palm ECC Ltd | Construction | 2017 |
| Palmat Properties Ltd | Real estate | 2021 |
| Palmer Rail Limited | Construction | 2024 |
| Panda Chinese Takeaway Limited | Administrative & support | 2011 |
| Panther FM Ltd | Administrative & support | 2025 |
| Panther Security and Facilities Management Limited | Administrative & support | 2025 |
| PAO Group Holdings Limited | Financial services | 2020 |
| PAO Group Limited | Financial services | 1999 |
| PAO Property Services Limited | Agriculture & fishing | 2013 |
| Paramount Parkour Academy Ltd | Arts & recreation | 2012 |
| Park 48 Limited | Wholesale & retail | 2023 |
| Park Crescent Holdings Limited | Financial services | 2019 |
| Park Hill Partners LLP | | 2023 |
| Park Lane Global Limited | Financial services | 2013 |
| Park Meadow (Hatfield) Management Limited | Households | 1965 |
| Parkashsons Limited | Information & communication | 2014 |
| Parker Property Designs Limited | Construction | 2025 |
| Parkinson House Management Company Limited | Households | 2015 |
| Parkred Solutions Ltd | Extraterritorial | 2010 |
| Parkside 100 Holding Ltd | Real estate | 2023 |
| Parkside 100 Trading Ltd | Real estate | 2023 |
| Parkside Flats Limited | Households | 1981 |
| Parmanresources Ltd | Real estate | 2026 |
| Parmeshar Ltd | Transport & logistics | 2016 |
| Pars Freight Limited | Administrative & support | 2014 |
| Particles Accelerator Investments PVT Ltd | Wholesale & retail | 2024 |
| Party and Paper Solutions Limited | Wholesale & retail | 2005 |
| Pasat Building Contractors Ltd | Construction | 2025 |
| Pass Tyres Ltd | Wholesale & retail | 2025 |
| Paston Holdings Limited | Real estate | 2020 |
| PAT and Moos Enterprise Limited | Health & social care | 2014 |
| PAT Wood Space Ltd | Manufacturing | 2025 |
| Patel CW Ltd | Construction | 2022 |
| Pathfinder Fitness Limited | Arts & recreation | 2025 |
| Patley Properties Limited | Construction | 2020 |
| Pauco Ltd | Real estate | 2021 |
| Pauga Dryliner Ltd | Construction | 2026 |
| Paul Atton Planning Limited | Professional & scientific | 2022 |
| Paul Bates Carpentry Ltd | Construction | 2017 |
| Paul Cristian Company Ltd | Construction | 2014 |
| Paul Lesnik Ltd | Other services | 2012 |
| Paul Mccarthy Carpentry Ltd | Construction | 2017 |
| Paul Mcgee Contracting Services Limited | Transport & logistics | 2015 |
| Paul Metcalfe International Limited | Manufacturing | 2003 |
| Paun PYV Limited | Transport & logistics | 2016 |
| Pav's Catering Ltd | Other services | 2020 |
| Pavalache Trans Limited | Transport & logistics | 2019 |
| Pawel Chmura Limited | Transport & logistics | 2014 |
| Pawel N Trans Limited | Transport & logistics | 2021 |
| Paws & Learn Pet Service Ltd | Other services | 2022 |
| PAWS2SHOW Limited | Information & communication | 2019 |
| PAX Systems Ltd | Information & communication | 2016 |
| Paz-Tek Limited | Construction | 2023 |
| PB Air Conditioning Limited | Construction | 2017 |
| PBV Haulage Ltd | Wholesale & retail | 2020 |
| PC Design & Print Ltd | Manufacturing | 2021 |
| PC247 Limited | Construction | 2025 |
| Pcqualityhand Ltd | Health & social care | 2019 |
| Pcshops Ltd. | Transport & logistics | 2009 |
| PDH Chem Limited | Extraterritorial | 2016 |
| Pdke Limited | Agriculture & fishing | 2019 |
| Peace of Mind Accounting Solutions Ltd | Professional & scientific | 2020 |
| Peace Properties Limited | Real estate | 2025 |
| Peace Property UK Ltd | Real estate | 2026 |
| Peach Corridor Ltd | Real estate | 2016 |
| Peaches and LEE Limited | Wholesale & retail | 2024 |
| Peak Horizons Ltd | Transport & logistics | 2026 |
| Pearce & Hart Fire Systems Ltd | Public administration | 2009 |
| Pearce & Tomlinson Limited | Real estate | 2017 |
| Pebbles Pre-School (Luton) Ltd | Education | 2015 |
| Peborough Style Limited | Hospitality | 2025 |
| Pedal and Polish Cleaning Ltd | Administrative & support | 2025 |
| Pedal Works Limited | Wholesale & retail | 2011 |