| Pargo Ltd | Wholesale & retail | 2021 |
| Parkersbusiness Ltd | Transport & logistics | 2022 |
| Parkoak Limited | Real estate | 1975 |
| Parkstead Lodge Limited | Households | 2004 |
| Parnham Holdings Limited | Financial services | 2024 |
| Parry & Cullen Electrical Ltd | Construction | 2020 |
| Parsonage Farm Property Company Ltd | Households | 2021 |
| Parsonage Farming Company Limited | Agriculture & fishing | 2017 |
| Partisan Games Ltd | Wholesale & retail | 2023 |
| Parw Consulting Limited | Information & communication | 2015 |
| Pathway Independent Financial Planning Limited | Financial services | 2013 |
| Pati Properties Ltd | Construction | 2026 |
| Patola Homes Limited | Real estate | 2019 |
| Patricia Gibson Transport Ltd | Administrative & support | 2025 |
| Paul Cordwell Photography Limited | Professional & scientific | 2002 |
| Paul Wisk Restos Ltd | Wholesale & retail | 2005 |
| Pave-Rite Limited | Construction | 2003 |
| Pawel Korczynski Limited | Transport & logistics | 2012 |
| Paws & Reflect Ltd | Other services | 2026 |
| PBG Logistics Limited | Transport & logistics | 2024 |
| PC Construction Group Ltd | Construction | 2025 |
| PD Formulae Ltd | Wholesale & retail | 2026 |
| PDM Training Solutions Limited | Education | 2003 |
| Pearl House Management Company Limited | Households | 1998 |
| Pearl Mattress Ltd | Wholesale & retail | 2012 |
| Peckamix Limited | Manufacturing | 2022 |
| Pedigree Stock Farm Developments Limited | Construction | 1931 |
| Peel Street Holdings Ltd | Financial services | 2014 |
| Pegley Holdings Ltd | Financial services | 2021 |
| Pegley Property Limited | Real estate | 2022 |
| Peking Chef 778 Limited | Hospitality | 2025 |
| Pemberton & Milner Limited | Manufacturing | 2010 |
| Pembroke Feeds Limited | Extraterritorial | 2001 |
| Pembroke Road Freehold Ltd | Households | 2023 |
| Penchard (Holdings) Ltd | Administrative & support | 2016 |
| Penchard Ltd. | Construction | 2016 |
| Penkar Ltd | Construction | 2025 |
| Pennies Haberdashery Ltd | Wholesale & retail | 2026 |
| Penton Way Management Ltd | Real estate | 2018 |
| People Make a Difference Ltd | Professional & scientific | 2025 |
| Peoplepanels Limited | Manufacturing | 2016 |
| Pepe Trans Ltd | Transport & logistics | 2014 |
| Percival & Co. Limited | Manufacturing | 2013 |
| Perfect Blanks Wholesale Limited | Wholesale & retail | 2023 |
| Perfect Bore Defence Limited | Manufacturing | 2025 |
| Perfect-Link Healthcare Ltd | Health & social care | 2026 |
| Peri Peri Spot Ltd | Hospitality | 2025 |
| Pervideo.Ai Limited | Information & communication | 2025 |
| Peter Tesar Architectural Design Limited | Professional & scientific | 2014 |
| Petpals (UK) Limited | Other services | 2001 |
| Petpals Nominees Limited | Other services | 2008 |
| Phaon Freight Solutions Ltd | Transport & logistics | 2021 |
| Pharma GRC Consulting Limited | Information & communication | 2019 |
| Phat App Ltd | Transport & logistics | 2022 |
| Phat Drivers Limited | Transport & logistics | 2023 |
| Phat Services Ltd | Transport & logistics | 2018 |
| Phoenix Cart Ltd | Wholesale & retail | 2025 |
| Phone Bits Limited | Other services | 2016 |
| Photowonder Europe Limited | Professional & scientific | 2006 |
| Piccadilly ROW T/A IVY Tile Company Limited | Wholesale & retail | 2021 |
| Picket Twenty RTM Company Ltd | Households | 2013 |
| PIK Leisure Ltd | Arts & recreation | 2025 |
| Pikes Coaches Limited | Transport & logistics | 2006 |
| Ping Ping Jewellery Limited | Wholesale & retail | 2011 |
| Pink Brickwork Limited | Construction | 2000 |
| Pink Ostrich Pictures Ltd | Information & communication | 2014 |
| Pinnacle Executive Coaching Limited | Administrative & support | 2025 |
| Pirouette Communications Limited | Professional & scientific | 2020 |
| Pizza Delight Ltd | Hospitality | 2019 |
| PL Management (Hampshire) Limited | Professional & scientific | 2021 |
| Plastethurm Ltd | Extraterritorial | 2022 |
| Platform Electronics Limited | Professional & scientific | 1994 |
| Platinum Base Builders Ltd | Manufacturing | 2025 |
| Platinum Real Estate Ventures Ltd | Real estate | 2026 |
| PMB Transport Ltd | Transport & logistics | 2018 |
| Pocsafe UK Ltd | Wholesale & retail | 2026 |
| Polymetallic Process Research Limited | Administrative & support | 2022 |
| Pool Industry Promotions Limited | Information & communication | 1996 |
| Pope & Co Ltd | Manufacturing | 2025 |
| Poppies Daycare Nursery Limited | Education | 2006 |
| Portable Cold Stores Ltd | Wholesale & retail | 2023 |
| Portafix Limited | Wholesale & retail | 1993 |
| Portarski Ltd | Transport & logistics | 2019 |
| Portland Properties (Hampshire) LLP | | 2026 |
| Portland West Developments LLP | | 2010 |
| Portland West Limited | Construction | 2015 |
| Portsmouth Naval Gliding Centre | Other services | 2012 |
| Portway Domestic Appliances Limited | Wholesale & retail | 1989 |
| Portway Padel Limited | Arts & recreation | 2025 |
| Posh Barbers (Andover) Limited | Other services | 2025 |
| Postgrove Capital Limited | Real estate | 2016 |
| Poultney Building Services Ltd | Construction | 2011 |
| Pour & Paint Ltd | Arts & recreation | 2021 |
| Powapacs Limited | Other services | 2017 |
| Powder Coat UK Ltd | Manufacturing | 2020 |
| Powell Private Finance Limited | Financial services | 2015 |
| Power and Lighting Specialist Ltd | Construction | 2024 |
| Powersite Ltd | Energy | 2012 |
| PR News & Media Limited | Professional & scientific | 2023 |
| Prad Fusions Limited | Hospitality | 2025 |