| One Click Logistics Solutions Ltd | Transport & logistics | 2023 |
| One MAN Cleaning Services Ltd | Administrative & support | 2026 |
| One MAN Interior Ltd | Construction | 2023 |
| One Source Media Ltd | Professional & scientific | 2020 |
| One Way Recruitment Ltd | Administrative & support | 2023 |
| ONE2ONE Vehicle Sales Ltd | Wholesale & retail | 2022 |
| ONE4SEVEN Transport Ltd | Transport & logistics | 2025 |
| Onicla Ltd | Transport & logistics | 2021 |
| Onks Limited | Professional & scientific | 2024 |
| Online Rollers Limited | Wholesale & retail | 2000 |
| Onsho Limited | Wholesale & retail | 2024 |
| Onymar Trans Ltd | Transport & logistics | 2018 |
| OOH! Aviator Ltd | Hospitality | 2023 |
| Open Citadel Limited | Arts & recreation | 2018 |
| Open Twice Limited | Information & communication | 2019 |
| Optimal Homes Ltd | Construction | 2016 |
| Optimus Legal Services Ltd | Professional & scientific | 2019 |
| Optizim Limited | Wholesale & retail | 2015 |
| Orange Rain Property Limited | Real estate | 2022 |
| Orca Property Investment Limited | Extraterritorial | 2021 |
| Orcah Limited | Information & communication | 2005 |
| Orchard Farm Properties Limited | Construction | 2022 |
| Orchard Trade Supplies Ltd | Wholesale & retail | 2023 |
| Ordinate Solutions Limited | Professional & scientific | 2020 |
| Orion 70 Limited | Arts & recreation | 2025 |
| OS Autos Limited | Wholesale & retail | 2026 |
| Oundle Rugby Football Club (Professional) Limited | Arts & recreation | 2026 |
| OUR Maintenance Ltd | Construction | 2022 |
| OUR Paradoks Ltd | Manufacturing | 2017 |
| OUR Revival Ltd | Health & social care | 2026 |
| Outwax Ltd | Health & social care | 2026 |
| OV Facility Services Limited | Administrative & support | 2025 |
| Overclad Ltd | Construction | 2025 |
| Overstrand GC Ltd | Wholesale & retail | 2012 |
| Owen Hart Services Ltd | Agriculture & fishing | 2019 |
| Own Box Ltd | Information & communication | 2019 |
| Ownmentor Ltd | Information & communication | 2021 |
| OX Roofing and Building Ltd | Construction | 2025 |
| Oxbury Property Maintenance Ltd | Administrative & support | 2021 |
| Oxcroft 1959 Limited | Extraterritorial | 2013 |
| Oxfordshire Property Management Limited | Real estate | 2024 |
| P & D International Transport Limited | Transport & logistics | 2002 |
| P & E Trading Ltd | Real estate | 2015 |
| P & L Briggs Limited | Agriculture & fishing | 2003 |
| P & SM Johnson Limited | Administrative & support | 2002 |
| P & V Retail Ltd | Wholesale & retail | 2020 |
| P & Y Developments Limited | Construction | 2007 |
| P & Y Horry Properties Limited | Construction | 2007 |
| P Chorazak Driver Services Ltd | Transport & logistics | 2008 |
| P H Asfalt Ltd | Construction | 2023 |
| P P M Electrical Ltd | Construction | 2015 |
| P R Wright Limited | Administrative & support | 2012 |
| P V Civils Limited | Construction | 2017 |
| P W Mobile Repairs Limited | Administrative & support | 2004 |
| P&A Logistic Solutions Ltd | Transport & logistics | 2022 |
| P&D Machine Maintenance and Servicing Ltd | Professional & scientific | 2021 |
| P&H Engineering Ltd | Energy | 2024 |
| P&T Growers Limited | Wholesale & retail | 2024 |
| P.C. Caterers Limited | Hospitality | 2022 |
| P.F. Property Maintenance Limited | Construction | 2008 |
| P.L.R. Leisure Limited | Administrative & support | 2001 |
| P.M.J. Transport Ltd | Transport & logistics | 2025 |
| P.W.T.S Transport Ltd | Transport & logistics | 2025 |
| Pabel Sarker Ltd | Education | 2023 |
| Pace Pumps Ltd | Extraterritorial | 2018 |
| Paceys Bakery Limited | Manufacturing | 2014 |
| Paciora Transport Ltd | Transport & logistics | 2015 |
| PAD313 Logistics Ltd | Transport & logistics | 2019 |
| Paddock Developments (UK) Limited | Construction | 2013 |
| Pados Trans Ltd | Transport & logistics | 2018 |
| Padrao Limited | Information & communication | 2020 |
| PAG Developments Limited | Construction | 2017 |
| Pagoda Haulage Ltd | Transport & logistics | 2026 |
| Paige Contracting Ltd | Construction | 2022 |
| Pala Padel Club Limited | Arts & recreation | 2026 |
| Palivonas Ltd | Transport & logistics | 2013 |
| Palm & Vine Limited | Agriculture & fishing | 2020 |
| Palmer's ALE House Limited | Hospitality | 2021 |
| Pampawed Dog Grooming Ltd | Other services | 2020 |
| Pannebakker UK Limited | Wholesale & retail | 2022 |
| Papaya Live Style Ltd | Manufacturing | 2026 |
| Paraclit Care Consultancy Ltd | Health & social care | 2022 |
| Paragon Metals Ltd | Other services | 2007 |
| Parallel Imports Limited | Wholesale & retail | 2022 |
| Parallel UK Limited | Wholesale & retail | 2009 |
| Paranova Labels Limited | Manufacturing | 2025 |
| Paranova Print and Packaging Holdings Limited | Financial services | 2025 |
| Paranova Print and Packaging Limited | Manufacturing | 1994 |
| Paranova Sleeves and Cartons Limited | Manufacturing | 2025 |
| Park Home Doctor's Ltd | Construction | 2018 |
| Park Home Management (Midlands) Ltd | Construction | 2025 |
| Park Home Utilities Ltd | Real estate | 2025 |
| Park Lane Property Management Lincs Ltd | Households | 2018 |
| Parker (Masonry Imports) Limited | Wholesale & retail | 1999 |
| Parkersmith Events Ltd | Hospitality | 2015 |
| Parksafe Spalding Ltd | Hospitality | 2019 |
| Parnell Property & Lettings Ltd | Real estate | 2015 |
| Parol Trans Ltd | Transport & logistics | 2021 |
| Parrot Media Limited | Information & communication | 2025 |
| Partney Coffee & Grill Ltd | Hospitality | 2022 |