| Parkington Investments Limited | Construction | 2016 |
| Parkington Property Maintenance Limited | Construction | 2015 |
| Parkside Centre CIC | Health & social care | 2024 |
| Parkwood Hotels Limited | Hospitality | 2025 |
| Paros Property & Investments Limited | Real estate | 2000 |
| Partner in Care Limited | Administrative & support | 2021 |
| Partner UP Fitness Limited | Arts & recreation | 2024 |
| Party Pace Club Ltd | Wholesale & retail | 2026 |
| Pascal Investment Company Ltd | Real estate | 2020 |
| Pashazine Ltd | Information & communication | 2025 |
| Passionate Corridor Ltd | Administrative & support | 2014 |
| Pathology First LLP | | 2014 |
| Patmark Limited | Professional & scientific | 2017 |
| Patoliv Ltd | Real estate | 2025 |
| Patrancis Care Limited | Health & social care | 2022 |
| Patric's Logistic Limited | Transport & logistics | 2016 |
| Patrick and Evelyn Limited | Transport & logistics | 2017 |
| Patrick Flannery Holdings Limited | Professional & scientific | 2025 |
| Patterson and Co Accounting Services Limited | Administrative & support | 2018 |
| Paul & Olley Painting Contractors Limited | Construction | 2003 |
| Paul Bailey Construction Limited | Construction | 2011 |
| Paul Boxall Tattoos Limited | Arts & recreation | 2021 |
| Paul Brown LLP | | 2019 |
| Paul Cass Photography Limited | Other services | 2006 |
| Paul Flavin Ltd | Professional & scientific | 2025 |
| Paul James Grounds Maintenance Limited | Administrative & support | 2018 |
| Paul Kirkum Limited | Professional & scientific | 2013 |
| Paul Oughton Ltd | Construction | 2013 |
| Paul Simpole Flooring Ltd | Construction | 2012 |
| Paul Thornton Joinery Ltd | Construction | 2019 |
| Pawer Network Services Ltd | Information & communication | 2026 |
| PAY a Tone Limited | Water & waste | 2025 |
| Paycocke Logistics Ltd | Transport & logistics | 2020 |
| Paye Enterprise Limited | Extraterritorial | 2024 |
| Paye Properties Limited | Real estate | 2013 |
| PB Creative Studio Limited | Other services | 2014 |
| PB Flooring Services Limited | Construction | 2026 |
| PB Thermal Insulations Limited | Construction | 2018 |
| PBG 1 Trading Ltd | Construction | 2024 |
| PBG Trading Ltd | Construction | 2021 |
| Pbrooks Ltd | Administrative & support | 2018 |
| Pc&A Services Ltd | Other services | 2019 |
| PCA Enterprises Limited | Real estate | 2015 |
| Pcac Limited | Construction | 2006 |
| Pcfixing Ltd | Construction | 2015 |
| Pcpharma Ltd | Health & social care | 2025 |
| PCS Transport Ltd | Transport & logistics | 2025 |
| PDP Automotive Limited | Manufacturing | 2012 |
| Peaberries Food Ltd | Hospitality | 2025 |
| Peaberries Ltd | Hospitality | 2020 |
| Peace of Mind Consulting Ltd | Professional & scientific | 2019 |
| Peachey Basildon Group Limited (the) | Professional & scientific | 1969 |
| Peachey Bros.(Wholesale)Limited | Wholesale & retail | 1969 |
| Peachey Holdings Limited | Administrative & support | 1986 |
| Peacheys Catering Services Limited | Wholesale & retail | 1993 |
| Peachez Desi Events Ltd | Hospitality | 2023 |
| Peachview Limited | Real estate | 1912 |
| Peak X Studio Ltd | Professional & scientific | 2025 |
| Pearson Floor Coverings Ltd. | Construction | 2017 |
| Pearson Safety Limited | Other services | 2016 |
| Pedrosa Ltd | Construction | 2013 |
| Pemar Waste Ltd | Water & waste | 2021 |
| Pemba Group Private Limited | Construction | 2025 |
| Pemberton Partners Limited | Administrative & support | 2007 |
| Pena UK Ltd | Manufacturing | 2017 |
| Penelope James Custom-Made Carpets & Rugs Ltd | Wholesale & retail | 2012 |
| Penguinsoft Ltd | Information & communication | 2016 |
| Penliath Dogs Limited | Professional & scientific | 1989 |
| Pennington Slate Investments Limited | Information & communication | 2005 |
| Penrose Street Holdings Ltd | Financial services | 2014 |
| Penrose Street Studios Limited | Real estate | 2014 |
| Penshaw Limited | Information & communication | 2026 |
| Pensteel Limited | Wholesale & retail | 1983 |
| Pentroid Group Limited | Health & social care | 2021 |
| People Minded Limited | Professional & scientific | 2024 |
| Peppers Vehicle Solutions Ltd | Transport & logistics | 2015 |
| Pereira Property Investments Limited | Real estate | 2021 |
| Perfect Properties Management Ltd | Real estate | 2024 |
| Perfectview Properties Ltd | Real estate | 2024 |
| Perihelion-Uk Limited | Professional & scientific | 2013 |
| Perry Press Holidays LLP | | 2021 |
| Persian 3M Limited | Real estate | 2023 |
| Persian Blue Limited | Construction | 2015 |
| Persimmon London Limited | Construction | 2025 |
| Personal Choice Carers at Home Limited | Health & social care | 2012 |
| Perspicuity Limited | Information & communication | 2024 |
| Persuasion Communications Limited | Administrative & support | 2008 |
| Perz Ltd | Transport & logistics | 2015 |
| Pesh Ltd | Administrative & support | 2024 |
| Petal Touch Limited | Other services | 2024 |
| Petaretu-Anto Ltd | Professional & scientific | 2025 |
| Pete's Parcels Ltd | Transport & logistics | 2021 |
| Peter Godward Coaches Limited | Transport & logistics | 2014 |
| Peter Norman Ltd | Wholesale & retail | 2019 |
| Peter Watson Associates Ltd | Professional & scientific | 2013 |
| Petes Autogroup Ltd | Extraterritorial | 2023 |
| Petre O Enterprises Limited | Construction | 2015 |
| Petru M Construction Ltd | Construction | 2025 |
| Peverell Gardens Management Co Ltd | Households | 2025 |
| Peverels Investments Ltd | Professional & scientific | 2019 |