| Offie Delivery Limited | Manufacturing | 2016 |
| Ojoto Progressive Union C.I.C. | Other services | 2021 |
| OJU Associates Limited | Construction | 2018 |
| OKS Real Estate Ltd | Real estate | 2024 |
| Oladipo Limited | Wholesale & retail | 2018 |
| Olea Kitchen Ltd | Hospitality | 2026 |
| Olrick the Decorator Limited | Construction | 2023 |
| OM Care Ltd | Health & social care | 2010 |
| OM Freight Limited | Transport & logistics | 2020 |
| OM1 Care Limited | Health & social care | 2024 |
| Omienet Modern Workplace Solutions Ltd | Information & communication | 2024 |
| One Big Company Limited | Manufacturing | 2011 |
| One Seven Digital Ltd | Information & communication | 2023 |
| One Stop Digital Limited | Information & communication | 2024 |
| One Unit Logistics Ltd | Transport & logistics | 2020 |
| Onescorp Ltd | Professional & scientific | 2025 |
| Onwards and Upwards Consulting Ltd | Professional & scientific | 2024 |
| Operik AI Limited | Wholesale & retail | 2026 |
| Opportunity Property Ltd | Real estate | 2020 |
| Optimal Distribution Ltd | Wholesale & retail | 2025 |
| Optivance Solutions Limited | Administrative & support | 2025 |
| Orange Birch Ltd | Construction | 2015 |
| Ordex Accounting Limited | Professional & scientific | 2019 |
| Ordex Consultancy Limited | Professional & scientific | 2019 |
| Ordex Hospitality Limited | Extraterritorial | 2014 |
| Oregon Care Limited | Health & social care | 1998 |
| Ornan Services Ltd | Mining & quarrying | 2012 |
| Oruks IT Solutions Limited | Professional & scientific | 2009 |
| Oscar's Fish and Chips Limited | Hospitality | 2022 |
| Osck Holdings Ltd | Hospitality | 2025 |
| Oudjat Ltd | Wholesale & retail | 2020 |
| Overlap Overlays Plus Limited | Wholesale & retail | 2024 |
| OVR Electricial Limited | Construction | 2015 |
| Own Sweet Home Ltd | Real estate | 2018 |
| Oxonian Limited | Professional & scientific | 2025 |
| Oztech Software Ltd | Information & communication | 2023 |
| O’Hara Consultancy Limited | Professional & scientific | 2020 |
| P & L Cars Ltd | Transport & logistics | 2018 |
| P M a Plumbing & Heating Ltd | Construction | 2014 |
| P Repair Services Limited | Other services | 2025 |
| P Spectra Technology Limited | Information & communication | 2018 |
| Paam Investments Limited | Wholesale & retail | 2005 |
| Pace Academy Trust | Education | 2014 |
| Pacific House (Greenwich) Limited | Real estate | 2009 |
| Pacitti IT Consulting Ltd | Information & communication | 2024 |
| Padel & Pilates Ltd | Arts & recreation | 2025 |
| Padmavati Property Ltd | Real estate | 2021 |
| Page Electrical Contracts Limited | Construction | 2014 |
| Paint IT ALL Ltd | Construction | 2025 |
| Paker Properties Ltd | Real estate | 2023 |
| Paloma Sound Services Limited | Information & communication | 2014 |
| Paradise Lettings Limited | Real estate | 2022 |
| Parkplace Developments Ltd | Construction | 2021 |
| Parkstone Holdings Limited | Financial services | 2022 |
| Passion Impex Ltd | Wholesale & retail | 2025 |
| Pathak Pickles Ltd | Wholesale & retail | 2023 |
| Patron Saint Properties One Ltd | Real estate | 2026 |
| PAV Security Ltd | Administrative & support | 2010 |
| PC & Chan Co. Ltd | Other services | 2003 |
| PC Contracting Ltd | Construction | 2001 |
| PCF Management Services Limited | Professional & scientific | 1999 |
| PCL Hospitality UK Limited | Wholesale & retail | 2024 |
| Peake Properties Limited | Households | 2026 |
| Penet Essentials Ltd | Wholesale & retail | 2026 |
| Peniel Care Limited | Health & social care | 2026 |
| Peoplelogic Consulting Ltd | Professional & scientific | 2025 |
| Peopletech.Com Ltd | Professional & scientific | 2002 |
| Peppermill Associates Limited | Professional & scientific | 2012 |
| Percelle Productions Ltd | Arts & recreation | 2017 |
| Perovskia Consulting Limited | Information & communication | 2021 |
| Perovskia Investments Limited | Real estate | 2021 |
| Personal Services Ltd | Transport & logistics | 2024 |
| Pescaderia Ltd | Hospitality | 2025 |
| Pet ME Boutiques Ltd | Wholesale & retail | 2022 |
| Petemore Ltd | Professional & scientific | 2024 |
| Peter England Decorating Limited | Administrative & support | 2014 |
| Pgrp Limited | Public administration | 2026 |
| Phoenix Collection (Management) Limited | Hospitality | 2024 |
| Phoenix Global Search Ltd | Administrative & support | 2020 |
| Pick a POD Ltd | Hospitality | 2021 |
| Pickprime Ltd | Wholesale & retail | 2025 |
| Pink Cheetah Creative Ltd | Other services | 2026 |
| Pinnacle Hospitality Management Ltd | Hospitality | 2020 |
| Pinnal Limited | Manufacturing | 2025 |
| Pinto Garcia Limited | Real estate | 2025 |
| Pioneer Tour Ltd | Administrative & support | 2019 |
| Piri Piri Coulsdon Ltd | Hospitality | 2025 |
| Pivot Blue Limited | Professional & scientific | 2025 |
| Pivotal Electrical Group Ltd | Construction | 2024 |
| Pixeldesk Studios Ltd | Professional & scientific | 2020 |
| PJA Consultancy Limited | Professional & scientific | 2016 |
| PJJ Building & Roofing Services Limited | Construction | 2018 |
| Place Support Partnership Ltd | Other services | 2019 |
| Planning for Peace of Mind Ltd | Financial services | 2016 |
| Plume Noir Development Management Consulting Ltd | Professional & scientific | 2023 |
| PM Secure Rentals Ltd | Hospitality | 2022 |
| Polaris Passivhaus Consult + Construct Limited | Construction | 2022 |
| Poli Engineering Limited | Construction | 2008 |
| Portnalls Property Management Limited | Households | 2025 |
| Potashnick Bros Antiques | | 1993 |