| Ownedism Ltd | Real estate | 2022 |
| OWS Drainage and Plumbing Services Ltd | Water & waste | 2018 |
| Oxecrest Leisure Limited | Real estate | 2004 |
| Oxford Bioanalytical Testing Limited | Professional & scientific | 2013 |
| Oxford Court (Waterloo) Management Company Limited | Households | 1995 |
| Oxford Electrical (ST. Helens) Limited | Manufacturing | 1982 |
| Oxford Grow Ltd | Education | 2025 |
| Oxford Properties (NW) Limited | Real estate | 2024 |
| Oxford Properties Holdings Limited | Financial services | 2024 |
| Oxford Street News Limited | Wholesale & retail | 2019 |
| Oxford Vaughan Limited | Wholesale & retail | 2010 |
| Oxis Energy Limited | Professional & scientific | 2000 |
| Oxrange Limited | Construction | 2020 |
| Oxton Epicerie Ltd | Wholesale & retail | 2025 |
| Oxton Nutrition Ltd | Wholesale & retail | 2024 |
| Oxton Playwrights CIC | Other services | 2014 |
| Oxygen Freejumping Limited | Financial services | 2014 |
| Oxygen Property Partners Limited | Real estate | 2015 |
| Oyedemi Law Ltd | Health & social care | 2026 |
| Ozark Property Limited | Real estate | 2021 |
| Ozart Design Ltd | Information & communication | 2020 |
| Ozemwongie Limited | Transport & logistics | 2025 |
| OZON3 Clinic Limited | Health & social care | 2022 |
| Ozzza Telecoms Ltd | Information & communication | 2021 |
| O’Connor Partners Ltd | Professional & scientific | 2026 |
| O’Neill 4X4 Limited | Wholesale & retail | 2025 |
| O’Shea Healthcare Ltd | Administrative & support | 2023 |
| P & a Holdings (NW) Limited | Professional & scientific | 2017 |
| P & a Properties (Merseyside) Limited | Real estate | 2009 |
| P & B Safety Netting Ltd | Construction | 2003 |
| P & B Building Company Ltd | Construction | 2008 |
| P & B Building Services (North West) Limited | Construction | 2007 |
| P & B Electrical Services Ltd | Construction | 2020 |
| P & D Accountants Ltd | Professional & scientific | 2022 |
| P & D Contractors Limited | Construction | 2019 |
| P & D Property Estates Limited | Real estate | 2025 |
| P & F Publishing Limited | Information & communication | 2013 |
| P & G Enterprises (Merseyside) Limited | Real estate | 1998 |
| P & J Estates Ltd | Real estate | 2019 |
| P & L Building Contractors Limited | Construction | 2020 |
| P & L Cato Nurseries Limited | Financial services | 2019 |
| P & L Lettings Ltd | Real estate | 2024 |
| P & M Electrical Services (NW) Limited | Construction | 2009 |
| P & M Project Services Limited | Construction | 2009 |
| P & P Carey Property Ltd | Real estate | 2022 |
| P & P Mcdougall Property Company Limited | Real estate | 2023 |
| P & P Melut Limited | Administrative & support | 2018 |
| P & R Independent Trading Limited | Wholesale & retail | 2020 |
| P & R Property Solutions Limited | Real estate | 2023 |
| P & R Tyres Ltd | Wholesale & retail | 2017 |
| P & S Late Shop Ltd | Wholesale & retail | 2018 |
| P & S Mastic Asphalt Ltd | Construction | 2006 |
| P & T Contractors Ltd | Administrative & support | 2011 |
| P & V Estates Ltd | Real estate | 2017 |
| P a Installations Ltd | Construction | 2010 |
| P a Surgery Limited | Health & social care | 2015 |
| P and L Hospitality Limited | Hospitality | 2026 |
| P and S Roofing Ltd | Construction | 2023 |
| P B Electrical and Security Services Limited | Other services | 2000 |
| P B Hardwoods Limited | Wholesale & retail | 2015 |
| P Barnett Construction & Joinery Ltd | Construction | 2023 |
| P BEE Design Ltd | Construction | 2013 |
| P Brannan Ltd | Construction | 2018 |
| P Brownson Limited | Administrative & support | 2014 |
| P C 84 Limited | Hospitality | 2025 |
| P Carr Developments Ltd | Real estate | 2020 |
| P D & M J Limited | Information & communication | 2013 |
| P Daly Properties Limited | Real estate | 2025 |
| P Doherty Dental Ltd | Health & social care | 2023 |
| P E Anderson Limited | Professional & scientific | 2016 |
| P E Healthcare Limited | Health & social care | 2015 |
| P Evans & Sons Properties Limited | Real estate | 2024 |
| P F Electrical Merseyside Ltd | Construction | 2019 |
| P G Coaches and Mini Coaches Ltd | Transport & logistics | 2009 |
| P G Skaife Limited | Health & social care | 2015 |
| P Gilbertson & SON Plant Services Limited | Manufacturing | 2012 |
| P Gunson (Locum) Ltd | Professional & scientific | 2012 |
| P H Holt Foundation | Education | 2006 |
| P J Hawley Audit and Risk Services Limited | Professional & scientific | 2017 |
| P Joinery Ltd | Manufacturing | 2021 |
| P Jordan Trading Limited | Professional & scientific | 2022 |
| P K & J Hickey Ltd | Construction | 2012 |
| P K Brickwork Ltd | Construction | 2012 |
| P K Consultant Services Ltd | Professional & scientific | 2021 |
| P M Building Services Ltd | Construction | 2009 |
| P M Foods Ltd | Wholesale & retail | 2016 |
| P M Wood Products Limited | Wholesale & retail | 2013 |
| P Mack Limited | Construction | 2025 |
| P MAX Motors Ltd | Wholesale & retail | 2013 |
| P Moody Consultancy Limited | Professional & scientific | 2024 |
| P Moscrop Ltd | Administrative & support | 2018 |
| P Ohare Design and Build Ltd | Construction | 2025 |
| P Oxley Transport Limited | Transport & logistics | 2017 |
| P R D Media Ltd | Information & communication | 2009 |
| P R M Retail Ltd | Wholesale & retail | 2010 |
| P Rolce Financial Services Limited | Financial services | 2016 |
| P Stewart Electrical Limited | Construction | 2002 |
| P Stewart Holdings Ltd | Financial services | 2025 |
| P W Concepts Ltd | Professional & scientific | 2019 |
| P W I Developments Ltd | Construction | 2011 |