| Onexo Invest Ltd | Real estate | 2026 |
| Ontheline Traders Ltd | Wholesale & retail | 2026 |
| Oora Global Ltd | Wholesale & retail | 2026 |
| OP Accounts Limited | Professional & scientific | 2016 |
| Opani Limited | Wholesale & retail | 2026 |
| Operational Models Limited | Professional & scientific | 2013 |
| Oppro Consulting Limited | Professional & scientific | 2025 |
| Opraflow Ltd | Information & communication | 2026 |
| Optical Support Limited | Wholesale & retail | 1996 |
| Optimum Health and Fitness Limited | Arts & recreation | 2008 |
| Optimum Pallet Services Limited | Manufacturing | 2023 |
| Optimum Vitality Clinic Ltd | Health & social care | 2021 |
| Opulence Self Drive Ltd | Administrative & support | 2020 |
| Orange Dessert Ltd | Hospitality | 2026 |
| Orange Jelly Limited | Hospitality | 2016 |
| ORAVISION2 Ltd | Information & communication | 2024 |
| Orbaic Ecosystem Ltd | Information & communication | 2024 |
| Orchard & IVY Limited | Professional & scientific | 2026 |
| Orchard Drives and Patios Limited | Construction | 2012 |
| Orchard Farm Dowsdale Ltd | Agriculture & fishing | 2019 |
| Orchard Farm Park Ltd | Administrative & support | 2026 |
| Orden Fernandez Limited | Real estate | 2023 |
| Orelist Limited | Real estate | 2026 |
| Oresiri Limited | Manufacturing | 2017 |
| Orian Content Limited | Administrative & support | 2020 |
| Orient - U.K. Trading Co. Limited | Wholesale & retail | 1987 |
| Oriental Aurora Trade Ltd | Wholesale & retail | 2026 |
| Oriented Ltd | Wholesale & retail | 2025 |
| Oriocean Automation Engineering Co., Limited | Extraterritorial | 2025 |
| Ormond Holdings Ltd | Real estate | 2024 |
| Ornate Projects & Sons Ltd | Construction | 2026 |
| Ornate Projects Limited | Construction | 2015 |
| Orson Engineering Limited | Construction | 2007 |
| Oryon Solutions Limited | Health & social care | 2022 |
| Oshin Ltd | Real estate | 2020 |
| Osscaar Ltd | Other services | 2022 |
| OUR Little Explorers Nursery Ltd | Other services | 2022 |
| Outerworks Ltd | Construction | 2026 |
| Outsource Accountants Limited | Professional & scientific | 2017 |
| Ovodigital Ltd | Information & communication | 2020 |
| Owensley Construction Ltd | Information & communication | 2017 |
| OX Creative Limited | Administrative & support | 2018 |
| Oxford Oils Ltd | Hospitality | 2013 |
| Oxus Academy Ltd | Education | 2022 |
| Oxus Enterprise Limited | Information & communication | 2022 |
| Oxus Estates Ltd | Real estate | 2026 |
| Oxus Global Impact CIC | Education | 2024 |
| Oxus Technologies Limited | Information & communication | 2014 |
| Ozom Trade Limited | Wholesale & retail | 2025 |
| Ozone Hotels Group Ltd | Hospitality | 2026 |
| O’Donoghue Signalling Limited | Construction | 2018 |
| P & V Property Ltd | Real estate | 2012 |
| P and W Consulting Group Ltd | Professional & scientific | 2024 |
| P D Drives & Patios Ltd | Construction | 2014 |
| P G Keohane Limited | Health & social care | 2011 |
| P G Site Engineering Ltd | Construction | 2006 |
| P J L Decorators Limited | Construction | 2002 |
| P Whiteway & Co Limited | Real estate | 2026 |
| P&C Holdings London Ltd | Real estate | 2022 |
| P&D Estates Limited | Real estate | 2022 |
| P&R2511 Ltd | Construction | 2024 |
| P.A.D Interiors Limited | Construction | 2016 |
| P.A.V. Drylining Ltd | Construction | 2021 |
| P.C. Construction & Renovations Ltd | Construction | 2015 |
| P.C.B. Electronic Ltd | Manufacturing | 2001 |
| P.T.O.C.Yemen Center for Specialized Research and Studies Ltd | Professional & scientific | 2024 |
| Paahun Global Ltd | Wholesale & retail | 2025 |
| Pacific Vitality Ltd | Wholesale & retail | 2024 |
| Pacl Limited | Other services | 2011 |
| Padel MK Limited | Arts & recreation | 2024 |
| Pala Global Limited | Wholesale & retail | 2026 |
| Pall Property Solutions Limited | Real estate | 2019 |
| Palmer Technology Associates Ltd | Professional & scientific | 2020 |
| Palmera Homes Limited | Construction | 2009 |
| Palmoni Group Ltd | Financial services | 2026 |
| Pameer Autos Limited | Wholesale & retail | 2004 |
| PAN Pacific Noble Ltd | Information & communication | 2016 |
| Panda Fluff Franchise Limited | Wholesale & retail | 2023 |
| Panda Fluff Ltd | Wholesale & retail | 2023 |
| Panda Property Holdings Ltd | Financial services | 2019 |
| Panelcroft Computers Limited | Information & communication | 2001 |
| Panello Limited | Wholesale & retail | 2013 |
| Pannon Ltd | Information & communication | 2026 |
| Panukorn Enterprises Ltd | Education | 2023 |
| Paola Balzano Ltd | Manufacturing | 2013 |
| Paradise Vegetables Limited | Manufacturing | 2014 |
| Paragon Plus Ltd | Administrative & support | 2017 |
| Paramagnetic Communications Ltd | Manufacturing | 2020 |
| Paramjit Singh Chana Ltd | Extraterritorial | 2022 |
| Parcel SAF3 Limited | Wholesale & retail | 2024 |
| Parchment Property Group Ltd | Construction | 2025 |
| Pareen Care Limited | Health & social care | 2016 |
| Parish PUB Limited | Hospitality | 2020 |
| Park Way Leisure Limited | Administrative & support | 2015 |
| Parkfield Accountants Limited | Professional & scientific | 2018 |
| Parking Defence Limited | Other services | 2019 |
| Parsenne Ltd | Financial services | 2020 |
| Passion Business Solutions Limited | Information & communication | 2012 |
| Passt Limited | Health & social care | 2021 |
| Paszel Construction Pro Ltd | Construction | 2018 |