| Peak Code Ltd | Information & communication | 2025 |
| Peak Demand Limited | Information & communication | 2010 |
| Peak Fitness Collective Limited | Health & social care | 2024 |
| Peak PIK Ltd | Wholesale & retail | 2023 |
| Peak Products Online Limited | Wholesale & retail | 2025 |
| Peak Talent Partners Ltd | Administrative & support | 2025 |
| Peal Community Housing Limited | Real estate | 2017 |
| Peal Estates Properties Ltd | Construction | 2016 |
| Peanut Consulting Ltd | Information & communication | 2018 |
| Pear Tree Business Consulting Limited | Professional & scientific | 2019 |
| Pear Tree Close (Troston) Management Limited | Households | 2019 |
| Pearce Courses Ltd | Wholesale & retail | 2023 |
| Pearl Dental Plan Ltd | Health & social care | 2023 |
| Pearl Quality Consultancy Ltd | Information & communication | 2025 |
| Pearl Quality Properties Ltd | Information & communication | 2010 |
| Pearlventuresuk Limited | Real estate | 2024 |
| Pearson & Bancks Ltd | Other services | 2023 |
| Pebbl Innovations Ltd | Manufacturing | 2025 |
| Pebblio Limited | Information & communication | 2026 |
| Pedwall Consultancy Limited | Construction | 2009 |
| Peedee Software Limited | Information & communication | 2009 |
| Peel and Plum Ltd | Real estate | 2026 |
| Peerless Ltd | Transport & logistics | 2026 |
| Peerless Medical Ltd | Health & social care | 2019 |
| Peerport Ltd | Financial services | 2018 |
| Peggy Phoenix Ltd | Wholesale & retail | 2017 |
| Peis Corner Limited | Wholesale & retail | 2025 |
| PEL & Hide Investments Ltd | Construction | 2025 |
| Penflo Academy Limited | Education | 2025 |
| Penflo Limited | Wholesale & retail | 2025 |
| Penflo Retail Limited | Wholesale & retail | 2025 |
| Pengrove Limited | Real estate | 2023 |
| Penmon Holdings Ltd | Financial services | 2019 |
| Penmon Properties Ltd | Real estate | 2018 |
| Penniment Plumbing and Heating Ltd | Wholesale & retail | 2026 |
| Penrhyn Stays Ltd | Hospitality | 2026 |
| Penta Systems Ltd | Information & communication | 2025 |
| Pentacia Ltd | Wholesale & retail | 2026 |
| Pentire Land Ltd | Construction | 2022 |
| People Process Systems Limited | Information & communication | 2024 |
| Peoplekind Ltd | Administrative & support | 2016 |
| Peoplepoweredsolutions Ltd | Administrative & support | 2024 |
| Peoplesight Ltd | Professional & scientific | 2024 |
| PEP Property Ltd | Real estate | 2025 |
| Pepcom Limited | Information & communication | 2001 |
| Pepper Nest Properties Ltd | Real estate | 2025 |
| Peppers Holdings Limited | Real estate | 2025 |
| Peptide Direct Limited | Wholesale & retail | 2026 |
| Perch Investments | Professional & scientific | 2010 |
| Percy & Letty Ltd | Health & social care | 2020 |
| Perfect Stays Group Ltd | Real estate | 2026 |
| Performance Coaching Ltd | Health & social care | 2021 |
| Performance Tune Pro Ltd | Wholesale & retail | 2022 |
| Performanox Ltd | Professional & scientific | 2026 |
| Perfume Making Company Limited | Manufacturing | 2022 |
| Perla Development Limited | Administrative & support | 2013 |
| Perlyny Tours Ltd | Administrative & support | 2023 |
| Permanent Beauty Aesthetics Limited | Other services | 2023 |
| Perseus Ltd | Financial services | 2020 |
| Personal Assistants at Home Ltd | Administrative & support | 2023 |
| Personal Homelab Ltd | Information & communication | 2020 |
| Personalised Mugs Ltd | Manufacturing | 2022 |
| Personaliseme Ltd | Manufacturing | 2014 |
| Perspectivedev Ltd | Information & communication | 2025 |
| Pet Connection Hub Ltd | Wholesale & retail | 2025 |
| Pet Dog Planet Ltd | Wholesale & retail | 2025 |
| Pet Health Direct Limited | Wholesale & retail | 2020 |
| Petal Power Ltd | Wholesale & retail | 2025 |
| Petalcart Ltd | Wholesale & retail | 2026 |
| Petch Engineering Limited | Professional & scientific | 2026 |
| Peter Cook Partnership Limited | Professional & scientific | 2008 |
| Peter Graham Wines Limited | Wholesale & retail | 2000 |
| Peter Keeble Plumbing & Heating Limited | Construction | 2008 |
| Peter King Electrical Limited | Construction | 2009 |
| Peter Owen Marketing Limited | Professional & scientific | 2009 |
| Peter Tryon Pianos Limited | Arts & recreation | 2015 |
| Peter Wragge Supplies Limited | Construction | 2003 |
| Peteverlovies Limited | Wholesale & retail | 2025 |
| Petflik Ltd | Other services | 2025 |
| Petnome Ltd | Wholesale & retail | 2025 |
| Petrol Bags Limited | Professional & scientific | 2009 |
| Petrotech (UK) Limited | Manufacturing | 2013 |
| Petrowl Integrity Limited | Professional & scientific | 2008 |
| Petrozaza Holdings Ltd | Agriculture & fishing | 2015 |
| Pets in Need Herts CIC | Wholesale & retail | 2024 |
| Petzymart Ltd | Wholesale & retail | 2025 |
| PG Landmark Limited | Manufacturing | 2023 |
| PG Prime Construction Ltd | Construction | 2021 |
| PG Prime Ltd | Professional & scientific | 2019 |
| PG Zone Ltd | Information & communication | 2023 |
| Phagura Homes Ltd | Real estate | 2018 |
| Phamous.Bse Ltd | Other services | 2025 |
| Phamy & Co Ltd | Professional & scientific | 2018 |
| Phantom Edge Limited | Financial services | 2023 |
| Phantombeacon Limited | Wholesale & retail | 2026 |
| Pharm TOX Consulting Limited | Professional & scientific | 2010 |
| Phasedcortex Ltd | Information & communication | 2026 |
| Phaze 3 Limited | Construction | 2026 |
| Phen Phen MAA Travel Ltd | Administrative & support | 2025 |
| Pheowl Ltd | Information & communication | 2025 |