| Orllen Limited | Professional & scientific | 2024 |
| Ornela Freimane Limited | Wholesale & retail | 2021 |
| ORO Enterprises Ltd | Other services | 2019 |
| Orthoform Wire Limited | Health & social care | 2013 |
| ORU Ltd | Hospitality | 2025 |
| ORZ Properties Ltd | Real estate | 2025 |
| Oscar Joshua Consultants Limited | Information & communication | 2013 |
| Osew Management Ltd | Real estate | 2023 |
| Oslo Estimating & Design Ltd | Professional & scientific | 2024 |
| OT Wealth Limited | Financial services | 2008 |
| Othia Ltd | Construction | 2025 |
| Otht Limited | Real estate | 2017 |
| Ottoman Grooming Limited | Other services | 2017 |
| Ourian Limited | Wholesale & retail | 2026 |
| OUT of Darkness Comes Light Ltd | Other services | 2013 |
| Outdoor Contracts Limited | Professional & scientific | 2013 |
| Outen Limited | Wholesale & retail | 2002 |
| Outstanding Young Scholars Society UK Ltd | Other services | 2023 |
| Ovan Properties Limited | Real estate | 2014 |
| Over Land and Sea Grips Limited | Information & communication | 2017 |
| Over the Rainbow Day Nursery Ltd | Education | 2012 |
| Overseal Roofing & Building Ltd | Construction | 2025 |
| Oviyam Ltd | Transport & logistics | 2022 |
| Owen Smith Properties Limited | Real estate | 2025 |
| OWF Carpentry Ltd | Manufacturing | 2024 |
| OXA Solution Ltd | Construction | 2026 |
| OZ Catering Services Limited | Hospitality | 2022 |
| Ozgur Consulting Limited | Information & communication | 2015 |
| P & K Chhokar Properties Ltd | Real estate | 2024 |
| P B Carpentry (GB) Limited | Construction | 2013 |
| P C French Electrical Services Limited | Construction | 2005 |
| P E H Ltd | Other services | 2021 |
| P J Laws Management Ltd | Construction | 2023 |
| P J Trees Ltd | Agriculture & fishing | 2017 |
| P K Media Limited | Professional & scientific | 2002 |
| P Kollipara Limited | Professional & scientific | 2011 |
| P S Evans Limited | Construction | 2003 |
| P&L Communications Engineering Limited | Construction | 2021 |
| P&M Properties London Ltd | Real estate | 2019 |
| P&M Property Developers Limited | Real estate | 2020 |
| P. Hall Electrical Limited | Construction | 2005 |
| P.I.D Global Limited | Administrative & support | 2012 |
| P.O.T. PUB Co. Ltd | Hospitality | 2026 |
| P.W. Shopfitters Limited | Construction | 1998 |
| P3M Solutions Limited | Information & communication | 2014 |
| PA Real Estate Ltd | Real estate | 2023 |
| PA Studio Works Limited | Information & communication | 2022 |
| Padda Residential Investment Ltd | Real estate | 2019 |
| Paddlers Swim School Ltd | Education | 2013 |
| Padel Services Ltd | Administrative & support | 2025 |
| PAG Scaffolding Ltd | Construction | 2022 |
| Paglesham House Management Company Limited | Real estate | 2024 |
| Pails 'N' Tails (Essex) Ltd | Wholesale & retail | 2015 |
| Paintech Ltd | Real estate | 2018 |
| Painting House Decoration Limited | Construction | 2023 |
| Pallet Trade Limited | Other services | 2026 |
| Palm Culture Ltd | Wholesale & retail | 2020 |
| Palma Ventures Ltd | Professional & scientific | 2021 |
| Palmer Masters Estates Ltd | Construction | 2025 |
| Palmernad Limited | Health & social care | 2016 |
| Pancajanya Limited | Financial services | 2013 |
| Panorama Solutions Ltd | Real estate | 2024 |
| Papas Peri Peri Grill Ltd | Hospitality | 2021 |
| Para Global Risk Management Ltd | Administrative & support | 2026 |
| Pareto Media Consulting Limited | Professional & scientific | 2012 |
| Parimi Real Estates Ltd | Real estate | 2026 |
| Paris Music Limited | Arts & recreation | 2006 |
| Paris Panache Ltd | Wholesale & retail | 2025 |
| Park Lane Essex Ltd | Wholesale & retail | 2020 |
| Parkross Properties Limited | Professional & scientific | 2006 |
| Parkside Brasserie Ltd | Hospitality | 2019 |
| Parkstone Developments Limited | Real estate | 2016 |
| Parkstone Group Limited | Financial services | 2021 |
| Parkstone Homes Limited | Real estate | 2017 |
| Parkstone Medics Limited | Health & social care | 2013 |
| Parkway Construction Limited | Construction | 2016 |
| Parkway Electrical Limited | Construction | 2016 |
| Parkway Property Management Limited | Real estate | 2025 |
| Partners Property Limited | Real estate | 2018 |
| Party Talk Records Limited | Information & communication | 2018 |
| Pashaj Properties Ltd | Real estate | 2025 |
| Passionate Advisor Ltd | Real estate | 2024 |
| Passive Fire Solutions Limited | Construction | 2016 |
| Pastel Power Limited | Wholesale & retail | 2024 |
| Pastoral Practice UK Ltd | Education | 2025 |
| PAT Letts Limited | Real estate | 2016 |
| PAT Moore Construction Ltd | Construction | 2025 |
| Patchouli Therapy Ltd | Health & social care | 2025 |
| Path Property Group Ltd | Real estate | 2016 |
| Path Property Maidstone Limited | Real estate | 2022 |
| Patona Consulting Ltd | Information & communication | 2017 |
| Patricia Rios Limited | Health & social care | 2019 |
| Patrick Laurence Limited | Wholesale & retail | 1982 |
| Patton Corporation Limited | Real estate | 2021 |
| Paul Burge Properties Ltd | Real estate | 2017 |
| Paul Cords Electrical Limited | Construction | 2014 |
| Paul Takhar Limited | Real estate | 2022 |
| Paul's Heating Services Limited | Construction | 2020 |
| PAW Secured Limited | Wholesale & retail | 2024 |
| Payroll Express Services Ltd | Professional & scientific | 2022 |