| Oxford Concepts Limited | Construction | 2020 |
| Oxford Engineering Consultancy Ltd | Information & communication | 2016 |
| Oxford House (Bolney) LLP | | 2010 |
| Oxford Lease Ltd | Real estate | 2026 |
| Oxford Medical Training Limited | Administrative & support | 2015 |
| Oxford Private Equity Ltd. | Information & communication | 2020 |
| Oxhill International Ltd | Real estate | 2022 |
| OXI Active Ltd | Wholesale & retail | 2025 |
| Oxways Ltd | Wholesale & retail | 2019 |
| Oxya UK Limited | Information & communication | 2011 |
| Oxygen Wealth Limited | Professional & scientific | 2018 |
| Oyoyo Consulting Limited | Professional & scientific | 2024 |
| Oyster Brokerage Limited | Other services | 1994 |
| Oyster Financial Planning Ltd | Financial services | 2013 |
| Oyster Information Management Solutions Limited | Professional & scientific | 2003 |
| Oyster Yachts (Southampton) Limited | Real estate | 2018 |
| Oyster Yachts (Wroxham) Limited | Real estate | 2018 |
| Oyster Yachts Events Limited | Other services | 1973 |
| Oyster Yachts Holdings Limited | Financial services | 2018 |
| Oyster Yachts Limited | Manufacturing | 2018 |
| Oysterco Limited | Hospitality | 2025 |
| Ozan Cafe Limited | Hospitality | 2026 |
| Ozboz Ltd | Professional & scientific | 2023 |
| Ozea Cart Ltd | Wholesale & retail | 2025 |
| Ozkok Dundar Ltd | Wholesale & retail | 2025 |
| Ozsimsekler Limited | Wholesale & retail | 2025 |
| Ozzy Kebab Van Ltd | Hospitality | 2025 |
| Ozzy Trans Ltd | Transport & logistics | 2018 |
| O’S Kitchen Ltd | Hospitality | 2019 |
| P & a Buczak Ltd | Hospitality | 2024 |
| P & C Property Corporation Limited | Real estate | 2017 |
| P & D Financial Solutions Limited | Professional & scientific | 2011 |
| P & E Logistic Ltd | Transport & logistics | 2020 |
| P & I Fast Food Limited | Hospitality | 2015 |
| P & J Mechanical Contracting Limited | Construction | 2015 |
| P & K Lacey (Construction) Limited | Construction | 2016 |
| P & K Lacey (Southampton) Limited | Construction | 2009 |
| P & M Earl Services Limited | Extraterritorial | 2019 |
| P & M Marron Investments Ltd | Real estate | 2005 |
| P & P Invest Limited | Financial services | 2002 |
| P & R Eades Properties Ltd | Real estate | 2016 |
| P & Z Taylor & SON Ltd | Other services | 2014 |
| P a Anderson Properties Ltd | Real estate | 2024 |
| P a Consulting Ltd | Professional & scientific | 2025 |
| P a Tomlinson Limited | Manufacturing | 2026 |
| P B Cooling Ltd | Construction | 2009 |
| P Business Solutions Ltd | Financial services | 2008 |
| P C & I Limited | Real estate | 2020 |
| P C D Business Services Ltd | Construction | 2009 |
| P D Accountancy Services Ltd | Professional & scientific | 2011 |
| P D Hunt Holdings Limited | Financial services | 2018 |
| P Davey General Builders Ltd | Construction | 2022 |
| P Graham Electrical Ltd | Construction | 2004 |
| P J Autos Southampton Limited | Wholesale & retail | 2008 |
| P J Braithwaite & Co Limited | Administrative & support | 2010 |
| P J Byrne & Sons Limited | Construction | 2009 |
| P Kelly Projects Ltd | Construction | 2020 |
| P M D Scaffolding Limited | Construction | 2019 |
| P Mitchell Engineering Ltd | Professional & scientific | 2007 |
| P Parkway Ltd | Real estate | 2019 |
| P R Willsher Ltd | Construction | 2025 |
| P Stubbington Land Surveys Limited | Professional & scientific | 2004 |
| P T I Lyndhurst Limited | Hospitality | 2022 |
| P W Associates Wealth Management Limited | Financial services | 2007 |
| P&B Vending Ltd | Hospitality | 2023 |
| P&D Clan Ltd | Administrative & support | 2017 |
| P&F Hodgkins Limited | Real estate | 2011 |
| P&J Retailing LLP | | 2013 |
| P&L Decorating (Southwest) Limited | Construction | 2017 |
| P&L Rees GRP Specialist Limited | Construction | 2011 |
| P&M Events Ltd | Hospitality | 2021 |
| P&N Food and Wine Ltd | Wholesale & retail | 2017 |
| P&P Best Drivers Ltd | Transport & logistics | 2016 |
| P&P Couriers Ltd | Transport & logistics | 2018 |
| P&S Woodland Limited | Construction | 2018 |
| P&T International Trading Limited | Wholesale & retail | 2017 |
| P-Tech Services UK Limited | Wholesale & retail | 2007 |
| P. & R. Produce Limited | Wholesale & retail | 1991 |
| P. T. Contractors Limited | Construction | 1984 |
| P.C.S Personal Computer Systems Limited | Information & communication | 2004 |
| P.Cramer & Co. Properties Limited | Real estate | 2025 |
| P.D. Masonry Ltd | Construction | 2014 |
| P.D.H. Farming Limited | Agriculture & fishing | 2004 |
| P.Dubaj Ltd | Transport & logistics | 2019 |
| P.G.L. Fresh Produce Services Ltd | Wholesale & retail | 2013 |
| P.J Autos Hampshire Ltd | Wholesale & retail | 2010 |
| P.J.D. Limited | | 1981 |
| P.R. Rappresentanze Limited | Extraterritorial | 2016 |
| P.S.E. Holdings Limited | Real estate | 1988 |
| P.Saran Consultancy Services UK Ltd | Professional & scientific | 2013 |
| P.T. (Holdings) Limited | Financial services | 1988 |
| P.T. Properties Limited | Construction | 1988 |
| P.V.C. Building Supplies Limited | Wholesale & retail | 1985 |
| P.V.C. Group Holdings Limited | Financial services | 2022 |
| P.W. Penny & SON Limited | Construction | 2015 |
| P1 Software Limited | Information & communication | 2021 |
| P39 Technologies UK Limited | Professional & scientific | 2019 |
| P4M2 Limited | Professional & scientific | 2017 |
| P7 Accounting Limited | Professional & scientific | 2009 |
| Pablo.Aryana Ltd | Transport & logistics | 2025 |