| Piccolo Mondo (Southern) Limited | Hospitality | 2011 |
| Picked Watton Farms Limited | Agriculture & fishing | 1992 |
| Pickleball and Club Ltd | Wholesale & retail | 2026 |
| Pickup & Co Ltd | Hospitality | 2008 |
| Pickwick Construction Limited | Construction | 2026 |
| Picton West Recruitment Limited | Administrative & support | 2013 |
| Pielot Ltd | Health & social care | 2014 |
| Pier Dining Limited | Hospitality | 2024 |
| Piercing Glance Ltd | Wholesale & retail | 2009 |
| Pierdole Limited | Real estate | 2025 |
| Pierdor Enterprises Limited | Professional & scientific | 1975 |
| Pierre Joinery Ltd | Construction | 2021 |
| Pigeon's Catering Ltd | Hospitality | 2017 |
| Piglets Day Nursery Limited | Health & social care | 1996 |
| Pikmc Ltd | Professional & scientific | 2021 |
| Pikor Services Ltd | Other services | 2026 |
| Pilanc Developments Ltd | Real estate | 2021 |
| Pilates Philosophy London Limited | Arts & recreation | 2023 |
| Pilates With Hannah Ltd | Arts & recreation | 2017 |
| Pilgrim Court Management Limited | Households | 1988 |
| Pilgrim Electrical and Property Services Limited | Construction | 2002 |
| Pilgrim Family Properties LLP | | 2016 |
| Pilgrim Property Investments Ltd | Construction | 2005 |
| Pillow Carry Ltd | Wholesale & retail | 2014 |
| Pillson Residents Company Limited | Real estate | 1988 |
| Pilotdirect Ltd | Transport & logistics | 2018 |
| Pilotech Ltd | Construction | 2006 |
| PIM Real Estate Ukeig | | 2015 |
| Pinagpala Ltd | Health & social care | 2023 |
| Pine Collection Ltd | Manufacturing | 2025 |
| Pineapple Graphics Ltd | Professional & scientific | 2019 |
| Pinehold Capital Ltd | Administrative & support | 2026 |
| Pinehurst 31 Winn Road Southampton Limited | Households | 1999 |
| Pinelands Ltd | Real estate | 2019 |
| Pinelea Residents Association Limited | Administrative & support | 2008 |
| Pinevale Limited | Professional & scientific | 2020 |
| Pinewood (Kanes Hill) Management Company Limited | Households | 1995 |
| Pinfolds Mechanical Ltd | Construction | 2017 |
| Ping Marine Ltd. | Professional & scientific | 2018 |
| Pink & Purple Limited | Wholesale & retail | 2019 |
| Pink Dough Limited | Professional & scientific | 2024 |
| Pink Ginger Creative Limited | Professional & scientific | 2025 |
| Pink Sika Design Ltd | Professional & scientific | 2022 |
| Pink Wahoo Limited | Professional & scientific | 2020 |
| Pink Willow Properties Ltd | Hospitality | 2019 |
| Pinkfroot Limited | Wholesale & retail | 2009 |
| Pinkmead Bistro & Tearooms Limited | Hospitality | 2021 |
| Pinkmead Hand Car Wash Limited | Other services | 2014 |
| Pinkstone Ltd | Construction | 2004 |
| Pinky's Samosa Shop Ltd | Hospitality | 2022 |
| Pinnacle Elite Healthcare Limited | Administrative & support | 2024 |
| Pinnacle Quantity Surveyors Ltd | Professional & scientific | 2024 |
| Pinnacle Site Services Ltd | Construction | 2026 |
| Pinneridge Developments Limited | Construction | 2001 |
| Pinpoint Music Limited | Wholesale & retail | 1986 |
| Pinpoint Social Media Marketing Ltd | Professional & scientific | 2020 |
| Pinpoint Veterinary Care Ltd | Professional & scientific | 2018 |
| Pinstripe Distribution Limited | Wholesale & retail | 2004 |
| PIP Morrison Limited | Administrative & support | 2014 |
| Pipecross Limited | Real estate | 1999 |
| Piper Prints Ltd | Professional & scientific | 2025 |
| Piper Wells Limited | Wholesale & retail | 1999 |
| Pipeworks Southampton Ltd | Construction | 2015 |
| Piranha Garner Boxing Limited | Arts & recreation | 2023 |
| Pirate Pasties Ltd | Manufacturing | 2021 |
| Pirimex Limited | Hospitality | 2025 |
| PIT Stop Ljpm Ltd | Wholesale & retail | 2025 |
| Pita Holding Ltd | Hospitality | 2026 |
| Pitlok Limited | Hospitality | 2024 |
| Pitstop Draws UK Ltd | Arts & recreation | 2025 |
| Pitt Construction Limited | Construction | 2021 |
| Pitt Stop Garage Limited | Wholesale & retail | 1999 |
| Pitter Bros. Limited | Professional & scientific | 1944 |
| Pitter Commercials Limited | Wholesale & retail | 1977 |
| Pitter Properties Limited | Real estate | 2012 |
| Pitter Rentals Limited | Transport & logistics | 2000 |
| Pivotal Financial Group Limited | Financial services | 2014 |
| Pivotal Growth Limited | Financial services | 2021 |
| Pivotal Innovations LAB Limited | Information & communication | 2026 |
| Pivottrade Ltd | Wholesale & retail | 2025 |
| PIX Design and Sign Limited | Wholesale & retail | 2020 |
| Pixel Cottage Limited | Information & communication | 2010 |
| Pixel Nova Technologies Ltd | Information & communication | 2026 |
| Pixelart Solution Ltd | Information & communication | 2025 |
| Pixelon Studios Limited | Information & communication | 2019 |
| Pixeltech Ltd | Information & communication | 2014 |
| Pixie Kitchen Ltd | Hospitality | 2023 |
| Pixies Day Nursery and Pixies TOO Limited | Education | 2010 |
| Pixies Tree Limited | Education | 2010 |
| Piya KA Ghar Properties Limited | Real estate | 2021 |
| Pizza Box Southampton Ltd | Hospitality | 2025 |
| Pizza Doughlivery Ltd | Hospitality | 2025 |
| Pizza Propaganda Limited | Hospitality | 2023 |
| Pizza Sidcup Ltd | Hospitality | 2024 |
| Pizza&Lobster Ltd | Other services | 2016 |
| Pizzasaurus Ltd | Hospitality | 2025 |
| PJ Brooks Limited | Construction | 2013 |
| PJ Building Ltd | Construction | 2016 |
| PJ GAS Limited | Energy | 2016 |
| PJ Mclean Tiling Ltd | Construction | 2024 |