| Pelican Print and Design Limited | Manufacturing | 1998 |
| Pelliscape Ltd | Information & communication | 2024 |
| Peloton Properties Limited | Real estate | 2010 |
| Peltiq Ltd | Professional & scientific | 2023 |
| Pemberley 3D Homes Ltd | Construction | 2025 |
| Pemberley Property Services Ltd | Real estate | 2017 |
| Pembroke Grove Consultancy Limited | Administrative & support | 2003 |
| Pembroke Palmer & Co. Ltd | Professional & scientific | 2011 |
| PEN & PAL Ltd | Wholesale & retail | 2025 |
| Pen-Yai Property Hub Ltd | Real estate | 2023 |
| Penam Marine LLP | | 2023 |
| Pencil 9 Ltd | Information & communication | 2020 |
| Pencil Box Design Limited | Professional & scientific | 2007 |
| Pencroft Property Investments Limited | Real estate | 2017 |
| Pendlemoor Ltd | Construction | 2015 |
| Pendley Estates (Kings Langley) Limited | Real estate | 2001 |
| Pendley Farm Management Limited | Households | 2023 |
| Pendley Sports Centre Limited | Arts & recreation | 1977 |
| Pendley Sports Limited | Arts & recreation | 2012 |
| Pendlington Consulting Limited | Professional & scientific | 2020 |
| Penguin RE Ltd | Real estate | 2026 |
| Penha Kanoro Retail Limited | Wholesale & retail | 2025 |
| Penima Haven Limited | Hospitality | 2023 |
| Penlea Properties Ltd | Households | 2019 |
| Penn and Reid Limited | Wholesale & retail | 2024 |
| Penny Assets Ltd | Hospitality | 2024 |
| Penny Lister Properties Limited | Hospitality | 2025 |
| Penny Rental Properties Ltd | Real estate | 2025 |
| Pennyland Residents Association Limited(The) | Real estate | 1983 |
| Penrose Creates Limited | Professional & scientific | 2021 |
| Pension Exchange Ltd | Extraterritorial | 2014 |
| Pension Freedom (UK) Limited | Financial services | 2013 |
| Pensioner Games Ltd | Arts & recreation | 2017 |
| Pentagon Limited | Wholesale & retail | 1984 |
| Pentagon South West Limited | Extraterritorial | 1990 |
| Pentagram Systems Limited | Information & communication | 2022 |
| Pentaquarks Limited | Information & communication | 2021 |
| Pentregat Limited | Professional & scientific | 2016 |
| People First Supported Living CIC | Hospitality | 2024 |
| People for Business Limited | Professional & scientific | 2000 |
| People Tree Limited | Wholesale & retail | 1994 |
| Peoplenpaws Ltd | Wholesale & retail | 2024 |
| Peoples Marketing & Trading Networks Limited | Information & communication | 2020 |
| Peoples Mart Management Ltd | Wholesale & retail | 2025 |
| PEP & Lekker Ltd | Manufacturing | 2016 |
| Peplobio Ltd | Professional & scientific | 2021 |
| Pepper & Roni Limited | Real estate | 2021 |
| Peppermint Foods Limited | Hospitality | 2010 |
| PER Kleberg Limited | Health & social care | 2011 |
| Peraz-Consult Ltd | Information & communication | 2018 |
| Perazim Limited | Administrative & support | 1996 |
| Perceptive Ponds Ltd | Wholesale & retail | 2020 |
| Perceptiveaccounting Limited | Professional & scientific | 2009 |
| Perch Housing Consults Limited | Professional & scientific | 2023 |
| Perch Investors Limited | Real estate | 2020 |
| Percy Publishing House Ltd | Information & communication | 2026 |
| Perez Creative Innovations Limited | Administrative & support | 2025 |
| Perfect Beauty Ltd | Other services | 2025 |
| Perfect Colours Painting and Decorating Ltd | Construction | 2020 |
| Perfect Corner Ltd | Wholesale & retail | 2023 |
| Perfect DOM Property Ltd | Real estate | 2023 |
| Perfect Fit Joinery. Ltd | Manufacturing | 2023 |
| Perfect Flooring Limited | Construction | 2020 |
| Perfect Home Solutions Limited | Real estate | 2024 |
| Perfect House Limited | Wholesale & retail | 2006 |
| Perfect Industrial Coatings Limited | Manufacturing | 2012 |
| Perfect M Solutions. Ltd | Administrative & support | 2025 |
| Perfect Metal-Fx Limited | Professional & scientific | 2010 |
| Perfect Paint Centres Limited | Wholesale & retail | 2002 |
| Perfect Places - Property Management Ltd | Real estate | 2024 |
| Perfect Warm Roofs Ltd | Construction | 2020 |
| Perfectionery Sweets Ltd | Other services | 2023 |
| Perfektion Facility Solutions Ltd. | Construction | 2025 |
| Perfen Ltd | Professional & scientific | 2025 |
| Perfit Properties Limited | Construction | 2023 |
| Perfmed Limited | Professional & scientific | 2023 |
| Performance Focused Development Ltd | Professional & scientific | 2011 |
| Performance Focused Leadership Limited Liability Partnership | | 2011 |
| Performance Impact Associates Limited | Professional & scientific | 2004 |
| Performance Wear Limited | Wholesale & retail | 2012 |
| Performing Arts Collective Limited | Arts & recreation | 2023 |
| Peri Peri Grill House Limited | Hospitality | 2020 |
| Peri Peri Original Bletchley Ltd | Hospitality | 2022 |
| Peri Peri Original Brooklands Ltd | Hospitality | 2025 |
| Peri Peri Original MK Ltd | Hospitality | 2025 |
| Peri Peri Orignal Newport Pagnell Ltd | Hospitality | 2025 |
| Peria AI Ltd | Information & communication | 2026 |
| Periculum Fiducia Limited | Information & communication | 2023 |
| Peridot Linea Ltd | Wholesale & retail | 2026 |
| Peritus Reward Consulting Limited | Professional & scientific | 2020 |
| Periwinkle Lane Maintenance Company (Dunstable) Limited | Households | 1982 |
| Permanent Makeup by Richenda Limited | Professional & scientific | 2019 |
| Perobi Ltd | Extraterritorial | 2022 |
| Perotti & Pereira Limited | Transport & logistics | 2002 |
| Perpetual Homes Limited | Construction | 2013 |
| Perpetual Property Sourcing Ltd | Real estate | 2025 |
| Perpetuous Security Solutions Ltd | Construction | 2025 |
| Perrica Limited | Professional & scientific | 2023 |
| Perry Beevor Financial Ltd | Financial services | 2017 |
| Perry's Products Ltd | Wholesale & retail | 2026 |