| Paul's Auto Repairs(Swindon) Ltd | Wholesale & retail | 2025 |
| Paula Beauty & Style Ltd | Other services | 2020 |
| Paula Blatch Ltd | Financial services | 2014 |
| Paulet Close Management Company Limited | Households | 1986 |
| PAV Garage Ltd | Wholesale & retail | 2023 |
| Pavilion Consultants (SWI) Ltd | Real estate | 2026 |
| Pavyo Ltd | Real estate | 2024 |
| Pawel Milkowski Ltd | Transport & logistics | 2014 |
| Paxcroft Hifi Ltd | Wholesale & retail | 2022 |
| Payroll Outsourcery Ltd | Professional & scientific | 2014 |
| Payslip Accountants Limited | Professional & scientific | 2016 |
| PB Premium Limited | Transport & logistics | 2022 |
| PBS Property Services Limited | Construction | 2025 |
| PC Group Ltd | Construction | 2008 |
| PCD Systems Limited | Professional & scientific | 2017 |
| PCH Business Consultants Ltd | Other services | 2016 |
| PCS Swindon Ltd | Administrative & support | 2022 |
| Pcs.West Limited | Construction | 2025 |
| Pcuk (Panelcraft UK) Limited | Wholesale & retail | 2024 |
| PD Empire Ltd | Manufacturing | 2023 |
| Pdmb Limited | Other services | 2013 |
| PDT Swindon Ltd | Hospitality | 2025 |
| Peace of Mind Pensions & Investments Ltd | Financial services | 2018 |
| Peach Estate Agents Limited | Real estate | 2025 |
| Peak Drive Solutions Limited | Information & communication | 2003 |
| Peak Pharma Holdings Limited | Financial services | 2018 |
| Peak Tech Clothing Limited | Wholesale & retail | 2025 |
| Peake Company Secretaries Limited | Professional & scientific | 1985 |
| Peake Nominees Limited | Professional & scientific | 1987 |
| Peaky Blinds Swindon Ltd | Wholesale & retail | 2024 |
| Pearce & Priestner Limited | Construction | 2006 |
| Pearce Funeral Services Limited | Other services | 2007 |
| Pearce&Read Property Ltd | Real estate | 2026 |
| Peare Carpentry Contractors Limited | Construction | 2003 |
| Pears Housing Ltd | Real estate | 2025 |
| Pearson Contracting Services Limited | Professional & scientific | 2007 |
| Pearsons Property Investments Limited | Real estate | 2018 |
| Peasedown Charcoal Grill Ltd | Hospitality | 2022 |
| Pebley Beach Consulting Limited | Administrative & support | 2024 |
| Peel Hotels (Bear Lane Wallingford) Limited | Hospitality | 2010 |
| Peel Hotels Limited | Hospitality | 1997 |
| Pejp Consulting Limited | Professional & scientific | 2014 |
| Pelagic Systems Limited | Manufacturing | 2006 |
| Pelissier Communications Ltd. | Professional & scientific | 2007 |
| Pell Enterprises Ltd | Real estate | 2024 |
| Pell Investments Ltd | Financial services | 2022 |
| Pellett Safety Services Ltd | Construction | 2024 |
| Pembroke Digital Limited | Information & communication | 2023 |
| Pendlebury Freeholders Ltd | Households | 2017 |
| Penfield Contracts Limited | Construction | 2012 |
| Penfold Gardens (Swindon) Management Company Limited | Households | 1988 |
| Pengwin Crew Ltd | Administrative & support | 2018 |
| Penhallow's of England Limited | Manufacturing | 2018 |
| Penkal Transport Limited | Transport & logistics | 2022 |
| Penn Property Ltd | Real estate | 2017 |
| Penn Street Promotions Limited | Extraterritorial | 2022 |
| Pennard Green Limited | Real estate | 2025 |
| Pennings Grange Ltd | Agriculture & fishing | 2023 |
| Pennlea Group Limited | Financial services | 2025 |
| Penny Property Ltd | Real estate | 2017 |
| Pennyhooks Farm Trust | Education | 2015 |
| Penponds Homecare Ltd | Health & social care | 2016 |
| Penros Project Ltd. | Other services | 2023 |
| Pensions and Annuities Limited | Financial services | 2008 |
| Penskar Limited | Professional & scientific | 2023 |
| Pentagon Edge Ltd | Professional & scientific | 2023 |
| Pentecost Associates Limited | Health & social care | 2017 |
| Pentel (Stationery) Limited | Wholesale & retail | 1970 |
| Penzaj Ltd | Real estate | 2024 |
| People Potential Limited | Administrative & support | 2007 |
| PEP UK SPV1 Limited | Construction | 2025 |
| Pepper Kitchen Fast Food Ltd | Hospitality | 2024 |
| Pepper&Co (Creative) Ltd | Information & communication | 2008 |
| Peppermint Design Ltd | Professional & scientific | 2020 |
| Peppertree Consulting Ltd | Professional & scientific | 2023 |
| Percaelum Ltd | Administrative & support | 2011 |
| Percaelum Services Ltd | Extraterritorial | 2022 |
| Percolation Labs Ltd | Information & communication | 2025 |
| Percy Stride Ltd | Wholesale & retail | 2018 |
| Pere Properties Ltd | Real estate | 2020 |
| Pereeve Electrical Supplies Limited | | 2008 |
| Perennial Home Improvements Ltd | Construction | 2017 |
| Perera Superstore Ltd | Wholesale & retail | 2026 |
| Perfect 2 KR Consultants Limited | Health & social care | 2013 |
| Perfect BD Solutions Ltd | Administrative & support | 2025 |
| Perfect Cover Decorators Ltd | Construction | 2017 |
| Perfect View Doors & Windows Ltd | Construction | 2020 |
| Performance Learning & Development Limited | Professional & scientific | 2001 |
| Performance Timber Products Group Limited | Manufacturing | 2009 |
| Performed Cleaning Ltd | Administrative & support | 2025 |
| Peribus GXP Ltd | Professional & scientific | 2025 |
| Perk Property Ltd | Real estate | 2025 |
| Perl 07677990 Limited | Extraterritorial | 2011 |
| Perma Developments Ltd | Administrative & support | 2003 |
| Permc Ltd | Transport & logistics | 2025 |
| Permitguard Systems Ltd | Information & communication | 2026 |
| PERMITS2WORK Limited | Professional & scientific | 2001 |
| Perry Consultancy Services Ltd | Information & communication | 2024 |
| Perry Mini Digger Hire Limited | Construction | 1987 |
| Perrys Property Establishment Ltd | Other services | 2024 |