| Oakwyn Homes Ltd | Real estate | 2025 |
| Oando Services Ltd | Information & communication | 2016 |
| Obesere Suzan Foods Ltd | Wholesale & retail | 2026 |
| Oceanwave Services (UK) Limited | Construction | 2014 |
| ODE to Ophir Ltd | Manufacturing | 2018 |
| Ofemi Ltd | Information & communication | 2018 |
| Ogena Obeha Ltd | Health & social care | 2024 |
| OK - Race Services Ltd | Professional & scientific | 2014 |
| Okparaa Ltd | Hospitality | 2023 |
| Old College Court Apartments Limited | Hospitality | 2004 |
| Olivez Property Ltd | Real estate | 2025 |
| OLU & DEE Services Limited | Financial services | 2016 |
| OM IQ Ltd | Construction | 2019 |
| OMF Events Limited | Other services | 2015 |
| Omnicart Solutions Limited | Wholesale & retail | 2026 |
| Omolara Catering & Co Healthcare Limited | Other services | 2016 |
| Omxo Services Limited | Professional & scientific | 2025 |
| ON One Network Ltd | Information & communication | 2025 |
| On-Cloud Consulting Services Ltd | Information & communication | 2022 |
| Onclemecks Ventures Limited | Other services | 2016 |
| One Stop Jerk Ltd | Hospitality | 2021 |
| Onside Limited | Arts & recreation | 2011 |
| Onyx Property Rental Ltd | Real estate | 2025 |
| Open Books Consultancy Limited | Professional & scientific | 2011 |
| Ophir House Ltd. | Wholesale & retail | 2021 |
| Options Events Rentals Ltd | Professional & scientific | 2023 |
| Orane Store Ltd | Wholesale & retail | 2021 |
| Orchard Bricks Limited | Real estate | 2019 |
| Orennah & Co Ltd | Professional & scientific | 2026 |
| Ores Management Ltd | Real estate | 2022 |
| Organic Fresh Fruits Limited | Agriculture & fishing | 2025 |
| Orsini Solutions Limited | Professional & scientific | 2022 |
| Overwork Ltd | Information & communication | 2024 |
| Oyinkan Promo Ltd | Arts & recreation | 2023 |
| Packing and Fabrication Anglia Ltd | Manufacturing | 2024 |
| Pagecard Limited | Construction | 1997 |
| Pampawed Limited | Wholesale & retail | 2022 |
| Panu Construction Limited | Construction | 2023 |
| Pashupati Jewellery Ltd | Wholesale & retail | 2015 |
| Patwari Brickwork Ltd | Construction | 2025 |
| Pawan Construction Ltd | Construction | 2023 |
| PBX Service Ltd | Manufacturing | 2025 |
| Pebble Grove Properties (Bexleyheath) Limited | Real estate | 2018 |
| Pebble Grove Properties Limited | Real estate | 2017 |
| People Mart Limited | Wholesale & retail | 2025 |
| Pepplus Ltd | Administrative & support | 2014 |
| Perfect Recruitment Services Limited | Administrative & support | 2016 |
| Perfektum UK Limited | Construction | 2018 |
| Performance Chemicals Limited | Manufacturing | 1956 |
| Performance Property Limited | Real estate | 2000 |
| Peri Pizza & Co Nuxley Ltd | Hospitality | 2024 |
| PFA Group Limited | Real estate | 2025 |
| Philom Constructions Ltd | Construction | 2026 |
| Phoenix Apartments Ltd | Hospitality | 2026 |
| Photomode Ltd | Professional & scientific | 2025 |
| Piara Homes Ltd | Real estate | 2026 |
| Picardy Consulting Limited | Information & communication | 2020 |
| Pick Aads Ltd | Professional & scientific | 2023 |
| Pieton Ltd | Transport & logistics | 2021 |
| Piko Limited | Health & social care | 2019 |
| Pinnacle Welfare Group Limited | Health & social care | 2026 |
| Pipbody Limited | Arts & recreation | 2022 |
| Pipe Services Limited | Construction | 2016 |
| Platinum Logistics Group Ltd | Transport & logistics | 2024 |
| Platinum Transport Solutions Ltd | Transport & logistics | 2001 |
| Pleasant Spaces Limited | Real estate | 2023 |
| Plunk Ltd | Professional & scientific | 2019 |
| Poget Care Foundation Ltd | Health & social care | 2022 |
| Policin Group Ltd | Wholesale & retail | 2025 |
| Poonia CAB Ltd | Transport & logistics | 2024 |
| Potent World Ltd | Arts & recreation | 2020 |
| Powells Plumbing and Heating Limited | Construction | 2013 |
| Powerlinc Ltd | Transport & logistics | 2023 |
| Poweron Engineering Limited | Construction | 2026 |
| Powersource Projects Limited | Wholesale & retail | 2000 |
| Preciousbest Services Ltd | Other services | 2017 |
| Preciouscore Limited | Information & communication | 2025 |
| Premier Freight Logistics Ltd | Transport & logistics | 2026 |
| Premier Powerflushing Ltd | Construction | 2024 |
| Premier Properties and Services Ltd | Real estate | 2020 |
| Premjit Singh Ltd | Construction | 2025 |
| Preprika Ltd | Manufacturing | 2025 |
| Preserve Homes Ltd | Hospitality | 2023 |
| Prestige Build Group Ltd | Construction | 2026 |
| Prestigeneo Limited | Real estate | 2025 |
| Prestigious Hair Stylist Ltd | Other services | 2020 |
| Pride SRT Ltd | Hospitality | 2018 |
| Prime Place UK Services Limited | Construction | 2022 |
| Printlogic Solutions Limited | Manufacturing | 2007 |
| Prisca PEE Limited | Health & social care | 2023 |
| Prismatique Ltd | Other services | 2023 |
| Process Hive Limited | Professional & scientific | 2022 |
| Profko BS Limited | Construction | 2020 |
| Profko M Ltd | Construction | 2023 |
| Profko S Ltd | Administrative & support | 2025 |
| Project Intelligence Ltd | Administrative & support | 2016 |
| Proofier Business Consulting Ltd | Information & communication | 2017 |
| Proofier Trading Ltd | Wholesale & retail | 2022 |
| Proper Move Limited | Professional & scientific | 2019 |
| Protons Church | Other services | 2022 |