| OUT of Office Group Ltd | Real estate | 2019 |
| Outfit Designer Ltd | Wholesale & retail | 2018 |
| Outreach Support Services Limited | Health & social care | 2015 |
| OVC Helping Hands Services Limited | Health & social care | 2021 |
| Over World Order Ltd | Manufacturing | 2021 |
| Oversight Entertainment Limited | Information & communication | 2019 |
| OVI Carpentry and Building Limited | Manufacturing | 2024 |
| OVI Motors Ltd | Wholesale & retail | 2015 |
| Ovidamian Ltd | Construction | 2025 |
| Oviyan Creations UK Ltd | Arts & recreation | 2015 |
| OVP Specialised Services Ltd | Administrative & support | 2018 |
| OVY & Andy Limited | Wholesale & retail | 2014 |
| Owapa Foods Limited | Wholesale & retail | 2024 |
| Owidube Limited | Health & social care | 2024 |
| Owscom Limited | Information & communication | 2024 |
| Oxford Automotive Ltd | Wholesale & retail | 2015 |
| Oxford Edition Limited | Other services | 2015 |
| Oxford English International Ltd | Other services | 2007 |
| Oxford Express Ltd | Real estate | 2021 |
| Oxford Research Syndicate Ltd | Professional & scientific | 2026 |
| Oxxain Property Ltd | Real estate | 2026 |
| OYA Oydash Limited | Real estate | 2015 |
| Ozbenz Limited | Wholesale & retail | 2017 |
| Ozer Hygiene Limited | Health & social care | 2005 |
| Ozor Cleaning Company Ltd | Administrative & support | 2026 |
| P & R ROY Ltd | Real estate | 2017 |
| P a Care Services Limited | Administrative & support | 2017 |
| P J Downey Crane Services Ltd | Construction | 2017 |
| P K 3 Ltd | Hospitality | 2015 |
| P Wells Building and Maintenance Ltd | Construction | 2015 |
| P&S Services Ltd | Construction | 2015 |
| P.S. Business Solutions Limited | Information & communication | 2010 |
| Pablo's Pizza Ltd | Hospitality | 2018 |
| Pabloz Pizza Ltd | Hospitality | 2023 |
| Pabs Industries Ltd | Wholesale & retail | 2026 |
| Pace Consultants Limited | Information & communication | 2022 |
| Pace Fitness Ltd | Arts & recreation | 2025 |
| Pachantinpi Ltd | Manufacturing | 2024 |
| PACHUNKOV99 Ltd | Construction | 2022 |
| Pack Ranger Limited | Wholesale & retail | 2023 |
| Paco-Elly Ltd | Other services | 2017 |
| Pacs Catering and Management Services Ltd | Hospitality | 2026 |
| Padel League Ltd | Arts & recreation | 2025 |
| Padious Trading Limited | Wholesale & retail | 2015 |
| Padnall Holdings Ltd | Real estate | 2025 |
| Pafina Enterprise Ltd | Health & social care | 2015 |
| PAK Double Glazing Ltd | Construction | 2019 |
| Pakistan Matters Limited | Professional & scientific | 2025 |
| Pakuk IT Solutions Limited | Information & communication | 2013 |
| Palitra 90 Ltd | Construction | 2019 |
| Palm Horizons Property Ltd | Real estate | 2025 |
| Palmer Surveyors and Consultants Limited | Professional & scientific | 2025 |
| Palmette Limited | Information & communication | 1995 |
| Paloui Security and Training Ltd | Administrative & support | 2017 |
| Pancas Properties Ltd | Real estate | 2024 |
| Panesar Constructions Ltd | Construction | 2023 |
| Panta Edil London Limited | Administrative & support | 2013 |
| Panther Pride Limited | Construction | 2019 |
| Paoloperettigroup Ltd | Hospitality | 2024 |
| Paragon Accounting & Tax Limited | Professional & scientific | 2021 |
| Paragon Glass Designs Limited | Manufacturing | 2002 |
| Paragon Offset Printers Limited | | 1980 |
| Paragon Training Academy Ltd | Education | 2016 |
| Paragon Umbrella Services Ltd | Administrative & support | 2021 |
| Paragonheight Tech Solutions Ltd | Wholesale & retail | 2025 |
| Parcel Relay Ltd | Transport & logistics | 2025 |
| Paris Luxury Collection Ltd | Wholesale & retail | 2016 |
| Pariz Beauty Extension Ltd | Other services | 2025 |
| Park View Enclave Ltd | Construction | 2019 |
| Participatory City Cooperatives Limited | Hospitality | 2022 |
| Parts FX Limited | Wholesale & retail | 2020 |
| Parts Rider Limited | Wholesale & retail | 2022 |
| PARTS4TECH UK Ltd | Information & communication | 2015 |
| PARTSDIRECT4U Ltd | Wholesale & retail | 2024 |
| Party Beee Ltd | Wholesale & retail | 2021 |
| Party Quiz Limited | Wholesale & retail | 2006 |
| Parya Ltd | Real estate | 2022 |
| Pasamatago Limited | Construction | 2017 |
| Pasava Logistics Limited | Transport & logistics | 2004 |
| Pascal Eddoh Ltd | Real estate | 2025 |
| Pascal Learning Limited | Information & communication | 2025 |
| Pascariu Contractors Ltd | Construction | 2018 |
| Pasfield Invest 2 Limited | Real estate | 2026 |
| Pasfield Invest Limited | Real estate | 2024 |
| Pasha Peri Peri Ltd | Hospitality | 2016 |
| Pasmat Limited | Construction | 2017 |
| Passion and Drive Ltd | Professional & scientific | 2014 |
| Passionate Health Care Agency Ltd | Administrative & support | 2023 |
| Passity Care Ltd | Other services | 2022 |
| Passportismlondon Ltd | Wholesale & retail | 2024 |
| PAT Project CIC | Education | 2023 |
| Paternoster Chambers Ltd | Professional & scientific | 2013 |
| Patryk.Nowak Ltd | Professional & scientific | 2021 |
| Pattern Destination Ltd | Hospitality | 2019 |
| Pattern World Ltd | Arts & recreation | 2016 |
| Patterns Investments Limited | Real estate | 2022 |
| Paul Bhogal Ltd | Real estate | 2024 |
| Paula Cool Ltd | Administrative & support | 2020 |
| Paula's Work Ltd | Administrative & support | 2023 |
| Paush Ltd | Professional & scientific | 2016 |