| Professor’S Original Ltd | Financial services | 2024 |
| Profile Brickwork Limited | Construction | 2003 |
| Profile Fabrications (PFL) Ltd | Manufacturing | 2024 |
| Profitable.Works Limited | Professional & scientific | 2007 |
| Progress Cleaning Services (Whiteplume) Limited | Water & waste | 1966 |
| Progressco. Ltd | Professional & scientific | 2024 |
| Progression Care Limited | Health & social care | 2017 |
| Project Connect Topco Limited | Financial services | 2023 |
| Project Eternal Limited | Information & communication | 2026 |
| Project Hercules Bidco Limited | Financial services | 2025 |
| Project Hercules Topco Limited | Financial services | 2025 |
| Project Management OS Ltd | Professional & scientific | 2017 |
| Project MO Ltd | Construction | 2023 |
| Project Porsche Ltd | Wholesale & retail | 2022 |
| Project Training International Limited | Information & communication | 2000 |
| Project Wexler Bidco Limited | Financial services | 2023 |
| Project Wexler EBT Limited | Financial services | 2024 |
| Project Wexler Finco Limited | Financial services | 2023 |
| Project Wexler Midco Limited | Financial services | 2023 |
| Project Wexler Topco Limited | Financial services | 2023 |
| Projectek Consultancy Limited | Other services | 2023 |
| Projectglass Ltd | Real estate | 2019 |
| Projection Properties Ltd | Real estate | 2024 |
| Projex-Partner Limited | Professional & scientific | 2018 |
| Prolift Scaffolding Ltd | Construction | 2025 |
| Proline Fencing & Decking Ltd | Administrative & support | 2015 |
| Promega UK Limited | Professional & scientific | 1989 |
| Prometheus Clinical Ltd | Professional & scientific | 2023 |
| Prometheus Security Consultancy Ltd | Administrative & support | 2021 |
| Promise Video Strategy Ltd | Information & communication | 2023 |
| Promofinity Limited | Information & communication | 2019 |
| Promotional Incentive Gifts Ltd. | Wholesale & retail | 2004 |
| Promotions Interactive Ltd. | Information & communication | 2016 |
| Promovan Events Limited | Administrative & support | 2016 |
| Prop Round Ltd | Real estate | 2024 |
| Prop Studios Limited | Arts & recreation | 2000 |
| Prop-Up Services Limited | Real estate | 2025 |
| Propaulus Solutions Limited | Construction | 2015 |
| Propave Landscapes Ltd | Professional & scientific | 2026 |
| Propelium Ltd | Real estate | 2023 |
| Proper Clean (South Coast) Ltd | Administrative & support | 2012 |
| Proper Trans Limited | Transport & logistics | 2018 |
| Properon Limited | Real estate | 2023 |
| Properties Enhancement Ukeig | | 2013 |
| Properties JJL Ltd | Real estate | 2025 |
| Properties R & R Ltd | Real estate | 2021 |
| Property Auction Group Ltd | Real estate | 2025 |
| Property Funnel Limited | Construction | 2016 |
| Property Link Southampton Limited | Real estate | 2012 |
| Property Matters Southern Ltd | Construction | 1997 |
| Property Partners Recruitment Ltd | Administrative & support | 2018 |
| Property Phix Limited | Construction | 2019 |
| Property Pursuits Ltd | Real estate | 2023 |
| Property Sales Progressors Ltd | Professional & scientific | 2025 |
| Property Valuation Services Limited | Real estate | 2022 |
| Property Wealth Investors (SPV) Ltd | Real estate | 2016 |
| Propertydetrusor Ltd | Real estate | 2023 |
| Prophecy Nutrition Ltd | Wholesale & retail | 2017 |
| Propora UK Ltd | Information & communication | 2025 |
| Props in Motion Ltd | Transport & logistics | 2019 |
| Propulsion Games Limited | Information & communication | 2014 |
| Proscenium Trade Limited | Wholesale & retail | 2026 |
| Prosearch Strategies UK Limited | Information & communication | 2017 |
| Prospect Capital Security Trustees Limited | Administrative & support | 2020 |
| Prospect Concepts Limited | Construction | 2025 |
| Prospect Logistics Limited | Real estate | 2018 |
| Prospectories Ltd | Real estate | 2025 |
| Prosperity Cathedral View Nmpi Ltd | Professional & scientific | 2016 |
| Prosperity Management Limited | Households | 2014 |
| Prosperity ST James House Nmpi Ltd | Other services | 2019 |
| Prospex Enterprise Ltd | Professional & scientific | 2024 |
| Prostoo Ltd | Construction | 2020 |
| Protea Property Group Ltd | Real estate | 2018 |
| Protean AM Ltd | Manufacturing | 2025 |
| Protect Asset Management Company Limited | Real estate | 1999 |
| Protect the Brand Ltd | Wholesale & retail | 2024 |
| Protect the Trade Ltd | Financial services | 2025 |
| Protectas Security Limited | Administrative & support | 2023 |
| Protek Fire & Security Ltd | Administrative & support | 2021 |
| Proton Healthcare Ltd | Administrative & support | 2016 |
| Prototype Venture Ltd | Wholesale & retail | 2023 |
| Protow Trailer Hire Ltd | Administrative & support | 2026 |
| Protpd Digital Solutions Ltd | Information & communication | 2022 |
| Proud Workforce Limited | Construction | 2018 |
| Provantis Limited | Wholesale & retail | 2017 |
| Providence Park (the Manor) RTM Company Limited | Households | 2019 |
| Providence Park (the Terrace) RTM Company Limited | Households | 2019 |
| Providence Park Estate Holdings Limited | Households | 2023 |
| Providence Property Company (South) Limited | Real estate | 2022 |
| Provincial House RTM Company Limited | Households | 2013 |
| Provincial Meadows Limited | Administrative & support | 2011 |
| Provisage Ltd | Health & social care | 2015 |
| Provm Ltd | Agriculture & fishing | 2019 |
| Prowe Consulting Limited | Administrative & support | 2018 |
| Proxy Recruitment & Services Ltd | Administrative & support | 2019 |
| PRS Marketing & Technology Ltd | Hospitality | 2024 |
| Pryde Electronics Limited | Professional & scientific | 1993 |
| PS & B - Surveying and Valuations Limited | Professional & scientific | 2009 |
| PS Gill Logistics Ltd | Transport & logistics | 2026 |
| PS Nest Limited | Health & social care | 2024 |