| Parinam Group Ltd | Professional & scientific | 2023 |
| Parkcote Limited | Wholesale & retail | 1983 |
| Parker Mccallum Holdings Limited | Financial services | 2026 |
| Parker Property Construction Limited | Construction | 2026 |
| Parker Property Group Limited | Real estate | 2017 |
| Parker Property Residential Limited | Real estate | 2020 |
| Parkin Tailored Timber Ltd | Construction | 2026 |
| Parking Partners ( Management Services) Ltd | Real estate | 2003 |
| Parking Partners Limited | Extraterritorial | 1999 |
| Parkland View (Kimpton) Management Limited | Households | 2019 |
| Parkside Hitchin Management Limited | Professional & scientific | 2005 |
| Parnil Properties Limited | Households | 2025 |
| Pashley Mortgages Limited | Financial services | 2019 |
| Patchwork London Limited | Manufacturing | 2011 |
| Path Medical UK Ltd | Manufacturing | 2015 |
| Pathway PR Ltd | Professional & scientific | 2018 |
| Pathways to Insight Ltd | Professional & scientific | 2024 |
| PATNOS04 Limited | Hospitality | 2022 |
| Pattinson White Consultancy Limited | Professional & scientific | 2011 |
| Paul & UMA Limited | Information & communication | 2020 |
| Paul Brewster Limited | Information & communication | 2008 |
| Paul Carpenter Plastering & Building Contracts Limited | Construction | 2003 |
| Paul Hosken Furniture Ltd | Manufacturing | 2020 |
| Paul Rogers Photography Limited | Professional & scientific | 2015 |
| Paul Savuto Financial Services Limited | Professional & scientific | 2014 |
| Paul Stallard Properties Limited | Real estate | 2014 |
| Paul Winterton Limited | Professional & scientific | 2012 |
| Paul's Bikes Limited | Wholesale & retail | 2011 |
| PAW in a Box Ltd | Wholesale & retail | 2024 |
| Pawsitive Dog Training Ltd | Professional & scientific | 2018 |
| PAY U Online Ltd | Professional & scientific | 2015 |
| Payitaht Limited | Hospitality | 2019 |
| PB Living Limited | Real estate | 2018 |
| PB Management Solutions Ltd | Agriculture & fishing | 2012 |
| PBM Traction Limited | Transport & logistics | 2016 |
| PBS Homes Group Limited | Construction | 2023 |
| PCS Cleaning Ltd | Administrative & support | 2025 |
| PCW Communications Limited | Information & communication | 2014 |
| PCW Window Cleaners Ltd | Administrative & support | 2024 |
| PDA Group Ltd | Education | 2022 |
| Pdpsuk Limited | Information & communication | 2018 |
| PE Building Services Ltd | Construction | 2018 |
| Peacock Training Solutions Limited | Professional & scientific | 2021 |
| Peakdell Investments Limited | Professional & scientific | 1965 |
| Peaktelevision Limited | Wholesale & retail | 2021 |
| Peaktoll Limited | Real estate | 1988 |
| Peanuts Design Ltd | Professional & scientific | 2020 |
| Peanuts Preschool Ltd | Education | 2025 |
| Pearldrop Limited | Information & communication | 2003 |
| Pearlsgate Limited | Health & social care | 2023 |
| Pearson Art Limited | Arts & recreation | 2003 |
| Pebble Consultants Limited | Administrative & support | 2012 |
| Peddle and Crank Ltd | Professional & scientific | 2015 |
| Pedestrian Market Research Services Limited | Professional & scientific | 1996 |
| Pedoka Electronics Limited | Wholesale & retail | 1979 |
| Pegsdon Property Group Limited | Real estate | 2021 |
| Pembroke Enterprise Ventures Limited | Professional & scientific | 2016 |
| Penbre Associates Limited | Professional & scientific | 2013 |
| Penco (Hitchin) Ltd | Wholesale & retail | 2007 |
| Pengegon Investment Group Ltd | Real estate | 2017 |
| Penhazy Ltd | Other services | 2022 |
| Penine Way Limited | Administrative & support | 1992 |
| Penmilne Contractors Limited | Construction | 2008 |
| Penny Black Enterprises Limited | Administrative & support | 2009 |
| Pentangle Design Limited | Professional & scientific | 1977 |
| Pentire Holdings and Consulting Limited | Professional & scientific | 2026 |
| Peregrine Tiles Limited | Wholesale & retail | 2022 |
| Perfect Fit Installations Limited | Construction | 2012 |
| Perfect Fit Properties Limited | Real estate | 2020 |
| Perfect Fit Scaffolding Limited | Construction | 2022 |
| Perfect Pitch Musicals Limited | Arts & recreation | 2007 |
| Perfectzone Residents Management Limited | Real estate | 1987 |
| Perg Limited | Real estate | 2023 |
| PERICHAM3 Ltd | Information & communication | 2021 |
| Periperi Original Hitchin Ltd | Hospitality | 2025 |
| Periwinkle Estates Limited | Financial services | 2010 |
| Perkpods Limited | Manufacturing | 2019 |
| Perry Jensen Limited | Real estate | 2015 |
| Person Centred Care Training Ltd | Public administration | 2025 |
| Personal Identity (Car Styling) Limited | Other services | 1988 |
| Personal Identity Limited | Professional & scientific | 1982 |
| Personal Revive Strategies Ltd | Health & social care | 2022 |
| Pet Symphony Limited | Other services | 2020 |
| Petals and Pistons Limited | Real estate | 2022 |
| Peter Cooper Bookkeeping & Accountancy Limited | Professional & scientific | 2024 |
| Petersson Consulting Limited | Information & communication | 2016 |
| Peytons Legacy Ltd | Real estate | 2025 |
| PFK Property Holdings Limited | Real estate | 2024 |
| PG Jeffery Limited | Transport & logistics | 2009 |
| PGB Asset Holdings Limited | Financial services | 2013 |
| PH Vehicle Solutions Ltd | Transport & logistics | 2024 |
| PH Venture Holdings Limited | Financial services | 2026 |
| Phar Partnerships Ltd | Professional & scientific | 2010 |
| Pharmacentric Solutions Limited | Professional & scientific | 2017 |
| Pharmalogiks Group Ltd | Information & communication | 2025 |
| PHE Contractors Limited | Construction | 2016 |
| PHI Consultants Limited | Professional & scientific | 2009 |
| Phil Nightingale Golf Ltd | Wholesale & retail | 2015 |
| Philip Acoustics Ltd | Professional & scientific | 2002 |
| Phillips Building & Property Maintenance Limited | Construction | 2016 |