| Probit-E Limited | Real estate | 2007 |
| Procare Solutions Limited | Health & social care | 2024 |
| Process Risk Consulting Limited | Professional & scientific | 2019 |
| Process Studios Limited | Arts & recreation | 1996 |
| PROCLEANINGSERVICES7 Limited | Administrative & support | 2024 |
| Proconstruction Group Ltd | Construction | 2025 |
| Prod. VSR Limited | Wholesale & retail | 2025 |
| Prodan Accountancy Ltd | Professional & scientific | 2021 |
| Prodan Ltd | Professional & scientific | 2013 |
| Prodeals Today Ltd | Wholesale & retail | 2023 |
| Prodec Painters Ltd | Construction | 2024 |
| Product DOC Ltd | Professional & scientific | 2022 |
| Product Group Limited | Wholesale & retail | 2025 |
| Product Line Limited | Wholesale & retail | 2016 |
| Product Promotion Services Limited | Professional & scientific | 2006 |
| Production World CIC | Information & communication | 2025 |
| Production World Group Ltd | Information & communication | 2024 |
| Productive Producing Limited | Information & communication | 2013 |
| Produthing Limited | Information & communication | 2015 |
| Professional Cleaners Ltd | Administrative & support | 2020 |
| Professional Glass Facades Ltd | Construction | 2021 |
| Professional Maintenance Service Ltd | Construction | 2020 |
| Professional Rush Resources Limited | Professional & scientific | 2022 |
| Professor Stores Limited | Wholesale & retail | 2025 |
| Profixvan Ltd | Wholesale & retail | 2023 |
| Progb Joinery Ltd | Manufacturing | 2021 |
| Progoti Property Solutions Limited | Real estate | 2023 |
| Progress Sales Recruitment Limited | Administrative & support | 2007 |
| Progressive Rail Solutions Limited | Professional & scientific | 2016 |
| Project Aegis Limited | Other services | 2026 |
| Project Contractors Ltd | Construction | 2018 |
| Project Omega Limited | Financial services | 2021 |
| Project World Takeover Ltd | Professional & scientific | 2025 |
| Projectlit Ltd | Information & communication | 2025 |
| Projex Consulting Ltd | Information & communication | 2010 |
| Prokit UK Limited | Wholesale & retail | 2008 |
| Proman Installations Ltd | Construction | 2025 |
| Promax Site Services Limited | Construction | 2026 |
| Promaxis Management Ltd | Administrative & support | 2015 |
| Prome Thean Solutions Ltd | Information & communication | 2013 |
| Prometheus Accounting Ltd | Professional & scientific | 2022 |
| Promibra Ltd | Health & social care | 2026 |
| Promium Network Ltd | Information & communication | 2016 |
| Proneel Ltd | Wholesale & retail | 2024 |
| Pronto Primera Ltd | Wholesale & retail | 2012 |
| Prontosoft Solutions Ltd | Information & communication | 2024 |
| Proparts Direct Ltd | Wholesale & retail | 2023 |
| Propass Ltd | Education | 2020 |
| Propath Football Academy Limited | Education | 2015 |
| Propco (Deal) Ltd | Construction | 2023 |
| Propco (Folkestone) Ltd | Construction | 2024 |
| Propco (Grays) Ltd | Construction | 2022 |
| Propco (Harlow) Ltd | Health & social care | 2025 |
| Propco (Maidenhead) Ltd | Construction | 2023 |
| Propco (Witham) Ltd | Construction | 2024 |
| Propco (Wokingham) Ltd | Construction | 2023 |
| Propco (Woodley Green) Ltd | Health & social care | 2022 |
| Propco Littlehampton Ltd | Construction | 2025 |
| Propel Studios Limited | Information & communication | 2023 |
| Properidge Limited | Real estate | 2020 |
| Properly Exposed Ltd | Professional & scientific | 2019 |
| Properties 4 Everybody Limited | Real estate | 2024 |
| Properties by P&J Ltd | Real estate | 2023 |
| Properties City Limited | Real estate | 2025 |
| Properties.Properties Limited | Real estate | 2018 |
| Property Bridge Limited | Real estate | 2024 |
| Property by AS Ltd | Real estate | 2023 |
| Property Condition Reports Ltd | Real estate | 2025 |
| Property Corner Ltd | Real estate | 2002 |
| Property Corp Group Ltd | Real estate | 2023 |
| Property Giant Ltd | Real estate | 2020 |
| Property Junkee Limited | Real estate | 2023 |
| Property Refurb Club Ltd | Real estate | 2024 |
| Property S.A.W. Ltd | Real estate | 2023 |
| Property Smart London Ltd | Real estate | 2024 |
| Property Survey Solutions Ltd | Professional & scientific | 2024 |
| Property Track Investments Limited | Financial services | 2018 |
| Property Traders Ltd | Real estate | 2019 |
| Property Vine Consultants Ltd | Real estate | 2016 |
| Property Vine Ltd | Households | 2024 |
| Property World Maintenance Ltd | Construction | 2020 |
| Property ZEN Rentals Ltd | Real estate | 2024 |
| Propertylicenceready Limited | Professional & scientific | 2025 |
| Prosmart Trading Ltd | Wholesale & retail | 2018 |
| Prosper Learning Ltd | Education | 2024 |
| Prosperity Hope Limited | Financial services | 2020 |
| Prosperity Investments London Ltd | Real estate | 2020 |
| Protech Team SAS Ltd | Administrative & support | 2020 |
| Protect Management Ltd | Administrative & support | 2023 |
| Protecthand Care Ltd | Health & social care | 2018 |
| Protection Group Security Services Limited | Administrative & support | 2025 |
| Protector Cleaning Ltd | Administrative & support | 2013 |
| Proto Security Ltd | Administrative & support | 2022 |
| Prototype IT Ltd | Information & communication | 2017 |
| Provado Solutions Ltd | Construction | 2026 |
| Proven Dough Limited | Manufacturing | 2020 |
| Proverb Solutions Limited | Information & communication | 2015 |
| Provest London Ltd. | Real estate | 2015 |
| Provident 9 Ltd | Real estate | 2020 |
| Provista Investments Limited | Real estate | 2024 |