| Oscar Property Ventures Limited | Real estate | 2026 |
| Osiers Court Properties Limited | Households | 1998 |
| OSR Saffron Vedik PVT Ltd | Wholesale & retail | 2019 |
| OT Neuro Ltd | Health & social care | 2013 |
| Otiliares Ltd | Health & social care | 2022 |
| Otto Cameron SQ Ltd | Real estate | 2019 |
| OUR Care Agency (Domiciliary) Limited | Health & social care | 2023 |
| OUR Care Agency Limited | Health & social care | 2023 |
| OUR Own Brand Limited | Information & communication | 2018 |
| Ourea Works Limited | Information & communication | 2016 |
| OUT of the Blue CI Ltd | Arts & recreation | 2021 |
| Out-There Productions Ltd | Information & communication | 2025 |
| Outcomepath Ltd | Information & communication | 2023 |
| Outdoor Interiors Limited | Administrative & support | 2019 |
| Outsider Music CIC | Health & social care | 2018 |
| Ovakra Ltd | Information & communication | 2025 |
| OVF Limited | Arts & recreation | 2023 |
| Ovingtonresearch Limited | Professional & scientific | 2018 |
| Owen & Chandler Investment Limited | Households | 2024 |
| Owzen Ltd | Information & communication | 2025 |
| Oxan Furniture Limited | Wholesale & retail | 2014 |
| Oxburgh Services Ltd | Administrative & support | 2017 |
| Oxford Court Management Company Limited | Households | 1985 |
| Oxford Film Partners Limited | Administrative & support | 2005 |
| Oxford SJM 2 Dissolved Limited Partnership | | 2016 |
| OXO Event Limited | Administrative & support | 2023 |
| Oyncia Ltd | Real estate | 2024 |
| Ozer Cleaning Ltd | Administrative & support | 2026 |
| Ozimo Creatives Ltd | Manufacturing | 2025 |
| P II P Limited | Professional & scientific | 2002 |
| P&Z Management Limited | Real estate | 2025 |
| P. a. Scott Consulting Limited | Information & communication | 2007 |
| P. Property Investments Limited | Real estate | 2024 |
| P.A. Information Services Limited | Administrative & support | 2012 |
| P.I.C. Group Limited | Financial services | 1994 |
| Pabellon Venezuelan Food Ltd | Hospitality | 2020 |
| Pacewell Computing Ltd | Professional & scientific | 2022 |
| Pachesham Park Estate Limited | Households | 2013 |
| Packed for Performance Ltd | Manufacturing | 2022 |
| PAD H&S Ltd | Construction | 2013 |
| Paddington Legal CIC | Professional & scientific | 2024 |
| Padel Roots Events Ltd | Arts & recreation | 2023 |
| Pagoda Property Limited | Real estate | 2016 |
| Paia Café Ltd | Hospitality | 2024 |
| Pakarian Properties Ltd | Real estate | 2025 |
| Palace Garage Limited | Wholesale & retail | 2022 |
| Palano Limited | Real estate | 2018 |
| Palm Coast Limited | Hospitality | 2026 |
| Palmares Media Ltd | Administrative & support | 2024 |
| Palmeira Pictures Ltd | Information & communication | 2016 |
| Palmers Solicitors, Kingston Upon Thames LLP | | 2020 |
| Pandit Enterprises Limited | Wholesale & retail | 2024 |
| Panjwani Investments Ltd | Real estate | 2020 |
| Paolo Perella Limited | Health & social care | 2023 |
| Paper-Capers Ltd | Wholesale & retail | 2021 |
| Para City Advertising & Technologies Ltd | Information & communication | 2025 |
| Paragon Global Engineering Ltd | Administrative & support | 2017 |
| Paragon Multimedia Limited | Other services | 2004 |
| Parallel Notion Limited | Professional & scientific | 1999 |
| Parallel Perceptions Limited | Information & communication | 1995 |
| Parcel Connect (UK) Limited | Transport & logistics | 2020 |
| Parcelworks Ltd | Transport & logistics | 2014 |
| Pardoev Ltd | Administrative & support | 2022 |
| Park Brew & Kitchen Ltd | Hospitality | 2023 |
| Park Close KT2 Limited | Real estate | 2024 |
| Park Cycles Limited | Administrative & support | 2011 |
| Park One Investment Ltd | Real estate | 2024 |
| Park Properties (Kingston) Limited | Households | 1999 |
| Park Service Garage Ltd | Wholesale & retail | 2026 |
| Parker & Coop Limited | Manufacturing | 2021 |
| Parker Core Services Ltd | Administrative & support | 2025 |
| Parker Executive Services Ltd | Other services | 2013 |
| Parkes Marketing Ltd. | Administrative & support | 2014 |
| Parklands Court Freeholders' Association Limited | Hospitality | 2011 |
| Parklands Property Investments Ltd | Real estate | 2015 |
| Parkside Accountants LLP | | 2013 |
| Parkview Management Company Limited | Households | 1990 |
| Parkview Tutoring Agency Ltd | Education | 2019 |
| Parkview Tutoring Ltd | Education | 2019 |
| Parlomi Ltd | Wholesale & retail | 2022 |
| Parris Hill Holdings Ltd | Professional & scientific | 2024 |
| Partica Kingston Limited | Wholesale & retail | 2008 |
| Partica Surrey Limited | Wholesale & retail | 2020 |
| Partisan Seven Limited | Administrative & support | 2010 |
| Partners in Tech Ltd | Professional & scientific | 2011 |
| Partnership for Children | Education | 2001 |
| Pasocom Community Interest Company | Wholesale & retail | 2026 |
| Passargad Group Limited | Construction | 2021 |
| Passing With Paul Ltd | Education | 2024 |
| Passport Global Ltd | Transport & logistics | 2019 |
| Pathmaker Consulting Limited | Professional & scientific | 2018 |
| Patient Properties Ltd | Real estate | 2012 |
| Patio Pizza Ltd | Hospitality | 2020 |
| Patricia Wake Designs Ltd | Arts & recreation | 1987 |
| Patrick Molony Limited | Administrative & support | 2012 |
| Paul Simons Consulting Ltd | Professional & scientific | 2025 |
| Paula Mahon Ltd | Administrative & support | 2025 |
| Pavilion Court Management (Wimbledon) Limited | Households | 1995 |
| Pavilion Structures Ltd | Administrative & support | 2021 |
| PAW Industrial Limited | Wholesale & retail | 2016 |