| Oreo Solutions Limited | Information & communication | 2022 |
| Organicoff Ltd | Wholesale & retail | 2026 |
| Oriflame Manufacturing Limited | | 1979 |
| ORLIN88 Ltd | Construction | 2020 |
| Orthotico Ltd | Wholesale & retail | 2026 |
| Orticulture Ltd | Administrative & support | 2025 |
| Osborne J UK Ltd | Construction | 2018 |
| Osborne Kruger Ltd | Mining & quarrying | 2011 |
| OSE Design Ltd | Construction | 2013 |
| OT Futures Limited | Information & communication | 2025 |
| Otium Support CIC | Professional & scientific | 2025 |
| Otrt Interiors Ltd | Manufacturing | 2016 |
| Ottermate Ltd | Information & communication | 2025 |
| OUR LAB Limited | Information & communication | 2025 |
| OUR Small Giant Universe Ltd | Financial services | 2024 |
| OUR Way Ltd | Real estate | 2025 |
| Outboard Consulting Limited | Professional & scientific | 2010 |
| Outplan Ltd | Financial services | 2016 |
| Overseas Legal Services Ltd | Professional & scientific | 2025 |
| Overton Court (Sutton) Management Company Limited | Households | 1989 |
| Ovova Limited | Transport & logistics | 2017 |
| OWL and the Elephant Limited | Wholesale & retail | 2021 |
| Own Transport Limited | Manufacturing | 2014 |
| Oxford Court(Surbiton)Maintenance Association,Limited | Households | 1969 |
| OZ Studios Ltd | Professional & scientific | 2021 |
| Ozan's VEG Limited | Wholesale & retail | 2022 |
| OZO Capital Limited | Information & communication | 2020 |
| P & J Harmony Ltd | Health & social care | 2026 |
| P D Billing Limited | Construction | 2014 |
| P J Gleed Plastering Ltd | Construction | 2015 |
| P&T Electrical Ltd | Construction | 2021 |
| P-Unit Management Limited | Other services | 2025 |
| P.W.Scenic Ltd | Construction | 2018 |
| P1LOT Limited | Professional & scientific | 2020 |
| Pablo Holdings Ltd | Wholesale & retail | 2024 |
| Pacific RIM Airways (UK) Limited | Transport & logistics | 2003 |
| Pact X Ltd | Financial services | 2025 |
| Padel Dogs Limited | Wholesale & retail | 2025 |
| Paintlux Ltd | Construction | 2008 |
| PAJ Consulting Limited | Information & communication | 2014 |
| PAK Groups Ltd | Other services | 2019 |
| Pala (PVT) Limited | Hospitality | 2019 |
| Palace Mansions Investments Ltd | Households | 2003 |
| Palace Mansions Residents Association Limited | Households | 1974 |
| Palisade Property Ltd | Real estate | 2023 |
| Palmerston Court Surbiton Limited | Households | 2011 |
| Palmgaming Technology Ltd | Information & communication | 2026 |
| Panache Healthcare Services Ltd | Health & social care | 2023 |
| Panchtatva Ltd | Manufacturing | 2025 |
| Pandora Management Limited | Households | 1957 |
| Papa Buildings Limited | Hospitality | 2017 |
| Papa Construction Services Limited | Other services | 2020 |
| Paper Garden Records Limited | Arts & recreation | 2023 |
| Pappdent Ltd | Health & social care | 2017 |
| Parachute Marketing Limited | Professional & scientific | 2007 |
| Parade Property Holdings Ltd | Real estate | 2023 |
| Parbat Brothers Limited | Other services | 2018 |
| Pargrange Limited | Construction | 1993 |
| Park Court Residents Association Limited | Households | 1959 |
| Park House (204 Ewell Road) Management Ltd | Households | 2007 |
| Park Tennis in Kingston Ltd | Arts & recreation | 2018 |
| Parker PA Ltd | Administrative & support | 2021 |
| Parkfields Residents Ltd | Households | 2020 |
| Parklane Tours Limited | Administrative & support | 2009 |
| Parkside Court Management (Kingston) Ltd | Other services | 2018 |
| Parsons Innovations Ltd | Information & communication | 2020 |
| Parsons Mead (Teddington) Limited | Households | 2001 |
| Parthian Contractors Ltd | Construction | 2023 |
| Partylol Ltd | Wholesale & retail | 2022 |
| PATH2SIGHT Ltd | Information & communication | 2024 |
| Pathrose Global Ltd | Professional & scientific | 2011 |
| Pattaiah Ltd | Hospitality | 2024 |
| Paul Fishpool Design Ltd. | Professional & scientific | 2016 |
| Paul Reeves Music Limited | Information & communication | 2008 |
| Paul's Pasts and Presents Ltd | Wholesale & retail | 2025 |
| Payouts Technology Ltd | Administrative & support | 2020 |
| Payrollgy Ltd | Real estate | 2024 |
| PB Consulting Global Limited | Professional & scientific | 2018 |
| PB Housing Consultants Limited | Administrative & support | 2010 |
| PB Meryn Ltd | Construction | 2018 |
| PBN Management Accounting Limited | Professional & scientific | 2017 |
| PCV Digital Limited | Information & communication | 2025 |
| Pdlj Futures Limited | Financial services | 2025 |
| Pdpy Ltd | Health & social care | 2024 |
| Peacehelix Limited | Professional & scientific | 2008 |
| Peak Performance Roofing & Guttering Ltd | Construction | 2026 |
| Pearlshire Limited | Real estate | 1998 |
| Pearly Smile Limited | Health & social care | 2016 |
| Pebnee Limited | Information & communication | 2025 |
| Pecanwood Holdings Ltd | Professional & scientific | 2022 |
| Pedal Projects Limited | Transport & logistics | 2024 |
| Peekart Ltd | Wholesale & retail | 2024 |
| Pegasus Resource Management Ltd | Professional & scientific | 2015 |
| Pelier Holdings Limited | Financial services | 2022 |
| Pembridge Services Andover Limited | Construction | 2018 |
| Pembridge Services Limited | Transport & logistics | 2009 |
| Pendlebury Court (Surbiton) Residents Association Limited | Households | 1962 |
| Penitus Consulting Ltd | Professional & scientific | 2012 |
| Penitus Property Ltd | Real estate | 2022 |
| Pensions and Actuarial Services Limited | Information & communication | 1994 |