| Profone Ltd | Wholesale & retail | 2024 |
| Proformance Vehicle Solutions Ltd | Other services | 2016 |
| Profound Kleening Services Ltd | Administrative & support | 2024 |
| Progacy Limited | Hospitality | 2023 |
| Progas Heating & Plumbing Services Ltd | Construction | 2026 |
| Progeny Properties Limited | Real estate | 1994 |
| Program Systems Limited | Information & communication | 1989 |
| Programmes Excellence Limited | Professional & scientific | 2008 |
| Progress Rail Leasing UK Limited | Transport & logistics | 1998 |
| Progress Rail Locomotive Europe Limited | Manufacturing | 2006 |
| Progress Rail Services UK Limited | Construction | 2011 |
| Progress Safety Management Ltd | Professional & scientific | 2018 |
| Progression 2WORK Limited | Education | 2017 |
| Progression 4 Work Ltd | Education | 2022 |
| Progressive Capacity Solutions Ltd | Professional & scientific | 2022 |
| Progressive Joinery Limited | Construction | 2003 |
| Progressive Management & Health Care Services Limited | Health & social care | 2019 |
| Progressive Property Partnerships Limited | Real estate | 2015 |
| Progressive Skills Partners Ltd | Professional & scientific | 2018 |
| Progzident Limited | Other services | 2016 |
| Prohealth and Wellbeing Ltd | Health & social care | 2026 |
| Prohibition Gems Ltd | Wholesale & retail | 2022 |
| Projan AI Ltd | Information & communication | 2026 |
| Project 60 Developments Ltd | Real estate | 2026 |
| Project Absolute Ltd | Professional & scientific | 2014 |
| Project and Change Management Ltd | Professional & scientific | 2022 |
| Project Asset Limited | Professional & scientific | 2016 |
| Project Assistant Ltd | Professional & scientific | 2022 |
| Project Bakelite Bidco Limited | Financial services | 2022 |
| Project Bakelite Topco Limited | Financial services | 2022 |
| Project Bathroom Ltd | Construction | 2023 |
| Project Beams CIC | Education | 2025 |
| Project Better Limited | Health & social care | 2017 |
| Project Build (Notts) Ltd | Construction | 2018 |
| Project C Topco Limited | Financial services | 2018 |
| Project Clark Limited | Construction | 2023 |
| Project Cuttlefish Ltd | Manufacturing | 2018 |
| Project Delivery Consulting Services Limited | Information & communication | 2018 |
| Project Emoji Bidco Limited | Financial services | 2017 |
| Project Emoji Topco Limited | Financial services | 2017 |
| Project Flow Holdings Limited | Financial services | 2024 |
| Project Gardens Limited | Administrative & support | 2023 |
| Project Gold Ltd | Education | 2023 |
| Project Henley Bidco Limited | Financial services | 2022 |
| Project Henley Topco Limited | Financial services | 2022 |
| Project Horizon Ltd | Construction | 2025 |
| Project Incorporated Limited | Professional & scientific | 2024 |
| Project Infinity Solutions Ltd | Professional & scientific | 2023 |
| Project Leisure Limited | Manufacturing | 2022 |
| Project One London Limited | Construction | 2017 |
| Project Pies (Nottingham) Ltd | Wholesale & retail | 2023 |
| Project Revitalise CIC | Wholesale & retail | 2022 |
| Project Risk Consultancy Limited | Professional & scientific | 2012 |
| Project Services Conversions Limited | Professional & scientific | 2005 |
| Project Telecom 101 Ltd | Financial services | 2022 |
| Project TEN Juniors Ltd | Education | 2023 |
| Project Time Ltd | Construction | 2019 |
| Project Trident Bidco Limited | Financial services | 2023 |
| Projectpending Limited | Wholesale & retail | 2024 |
| Projects Managed Ltd | Information & communication | 2011 |
| Projointz Ltd | Wholesale & retail | 2025 |
| Prokaza Consultancy Limited | Information & communication | 2016 |
| Prolancework Ltd | Information & communication | 2019 |
| Prolet Estates Limited | Real estate | 2026 |
| Prolet Management Limited | Real estate | 2026 |
| Proll Consultancy Limited | Health & social care | 2020 |
| Promark Consulting Limited | Professional & scientific | 2010 |
| Promedia Direct Ltd | Wholesale & retail | 2021 |
| Promedix Ltd | Health & social care | 2025 |
| Promenade Consulting Ltd | Other services | 2025 |
| Promenta Ltd | Information & communication | 2002 |
| Promethean Particles Limited | Manufacturing | 2007 |
| Prometheon Medical Limited | Health & social care | 2026 |
| Prominence Creator Network Limited | Professional & scientific | 2025 |
| Promise for Shelter Dogs CIC | Agriculture & fishing | 2024 |
| Promising Mortgage Solutions Limited | Professional & scientific | 2025 |
| Promm Limited | Information & communication | 2024 |
| Promotional Freelance Marketing(P.F.M) Limited | Construction | 2015 |
| Prompt EPC Ltd | Professional & scientific | 2025 |
| Prompt Security Services Ltd | Administrative & support | 2025 |
| Prompt Transit Ltd | Transport & logistics | 2024 |
| Pronestdev Ltd | Construction | 2026 |
| Proof of Pints Ltd | Other services | 2025 |
| Prooth Ltd | Wholesale & retail | 2026 |
| Propa Pizza Ltd | Hospitality | 2024 |
| Propac Solutions Limited | Administrative & support | 2025 |
| Propaint & Decor Design Ltd | Construction | 2025 |
| Propal IT Innovations Ltd | Information & communication | 2024 |
| Propalys Limited | Real estate | 2004 |
| Propbell Limited | Real estate | 2022 |
| Propco 2024 Limited | Construction | 2024 |
| Propco 2026 Limited | Construction | 2026 |
| Propel Performance Ltd | Administrative & support | 2018 |
| Proper Future Ltd | Real estate | 2022 |
| Proper-T 4U Ltd | Real estate | 2024 |
| Properties NO. 1 Limited | Real estate | 2024 |
| Propertieslashuflats Ltd | Real estate | 2021 |
| Propertools Property Limited | Real estate | 2023 |
| Property & Disputes Lawyer Limited | Professional & scientific | 2023 |
| Property '85 Limited | Real estate | 2024 |