| Olivers Management Services Limited | Administrative & support | 2025 |
| Olympuz Ltd | Administrative & support | 2022 |
| Ombre Beauty Club Ltd | Other services | 2024 |
| Omni Event Limited | Administrative & support | 2007 |
| Omsatya Ltd | Real estate | 2018 |
| ON Point Construction Services Limited | Construction | 2026 |
| ON Point Training Ltd | Health & social care | 2017 |
| ON Site Cleaning Limited | Administrative & support | 1999 |
| Once Upon a Time Birthdays Ltd. | Arts & recreation | 2012 |
| One of the FEW Limited | Professional & scientific | 2016 |
| One Point Design Limited | Professional & scientific | 2007 |
| One Wandsworth Common Management Company Limited | Real estate | 2008 |
| OPT Solutions Ltd | Construction | 2019 |
| Orange Nexus Limited | Wholesale & retail | 2021 |
| Orchard Court Residents' Association Limited | Administrative & support | 1992 |
| Ormonde Place (Weybridge) Management Company Limited | Households | 2000 |
| OSC Chessington Limited | Wholesale & retail | 2024 |
| OTC Direct Limited | Wholesale & retail | 1995 |
| OUD LAB Ltd | Wholesale & retail | 2025 |
| OUT Door Tiles Ltd | Manufacturing | 2021 |
| Oven Hands Limited | Administrative & support | 2011 |
| P Twelve Limited | Administrative & support | 2023 |
| PA Design and Build Limited | Construction | 2025 |
| Pa&Ka London Limited | Information & communication | 2022 |
| Pageantry Electronic Systems Limited | Manufacturing | 1995 |
| Pamas Property Services Ltd | Construction | 2010 |
| Panoptic Technologies Ltd | Professional & scientific | 2015 |
| Paradise Jeju Ltd | Hospitality | 2024 |
| Paramountwebtechnology Ltd | Information & communication | 2016 |
| Parish Arboriculture Limited | Agriculture & fishing | 2021 |
| Payce Limited | Real estate | 2011 |
| PBY Interiors Limited | Construction | 2021 |
| Peddlo Ltd | Real estate | 2019 |
| Pemburtons Limited | Administrative & support | 2018 |
| Pendine Construction Limited | Construction | 2013 |
| Penlee House Limited | Households | 2000 |
| Petrossian South Kensington Ltd | Wholesale & retail | 2022 |
| Pharma Logistics Network Limited | Professional & scientific | 2017 |
| Pharmaready Limited | Professional & scientific | 2018 |
| Philip Varma Transportation Ltd | Transport & logistics | 2020 |
| Philip Wingfield Limited | Other services | 2003 |
| Picknpack Limited | Wholesale & retail | 2025 |
| Piglets Pre-School Ltd | Health & social care | 2019 |
| Pine Tree Trading Ltd | Administrative & support | 2014 |
| Pinkerton Court (Kingston) Management Company Limited | Households | 1977 |
| PIP Cope Stunts Ltd | Arts & recreation | 2022 |
| PJM Boiler Services Ltd | Construction | 2008 |
| PKP Scaffolding Limited | Construction | 2024 |
| Planet B Limited | Manufacturing | 2023 |
| Playmates Nursery Chessington Limited | Education | 2004 |
| Playtime Day Nursery (Chessington) Ltd | Health & social care | 2019 |
| Plenti Logistics Ltd | Transport & logistics | 2025 |
| PM Construction and Insulation Limited | Construction | 2013 |
| PNC Trade Ltd | Wholesale & retail | 2017 |
| Pokecentral Ltd | Wholesale & retail | 2025 |
| Polmor Ltd | Manufacturing | 2015 |
| Polymicrogyria Family Support | Information & communication | 2013 |
| Poorana Limited | Real estate | 2021 |
| Positive Leap Company Limited | Financial services | 2024 |
| Pound Bargain Northwich Ltd | Wholesale & retail | 2019 |
| Powdergrove Limited | Households | 1983 |
| Powerly London Limited | Energy | 2022 |
| Powers Consultants Limited | Administrative & support | 2004 |
| Practical Pillars Ltd | Administrative & support | 2026 |
| Pranab Construction Ltd | Construction | 2025 |
| Prayoktic Limited | Information & communication | 2026 |
| PRC Associates Limited | Professional & scientific | 2001 |
| Precision Air Systems Ltd | Manufacturing | 2025 |
| Precision Roofing Ltd | Extraterritorial | 2017 |
| Premier College of London Limited | Extraterritorial | 2012 |
| Presentgrove Limited | Households | 1983 |
| Prestige Epsom Group Ltd | Manufacturing | 2020 |
| Prime Tree Care Ltd | Agriculture & fishing | 2019 |
| Primo Construction Ltd | Construction | 2022 |
| Priniti Limited | Wholesale & retail | 2025 |
| Pritchards of London Ltd | Transport & logistics | 2003 |
| Pro Campaigns Ltd | Professional & scientific | 2024 |
| Pro Edge Industries Limited | Manufacturing | 2025 |
| Pro Elements Heating Ltd | Construction | 2020 |
| Professional Roofing Solutions Ltd | Construction | 2025 |
| Progas Building Solutions Ltd | Construction | 2025 |
| Project Blue Book Limited | Extraterritorial | 2011 |
| Project Planning Professionals Limited | Information & communication | 2004 |
| Projengbiz Limited | Professional & scientific | 2016 |
| Promate World UK Ltd | Manufacturing | 2017 |
| Prospect Eleven Ltd | Real estate | 2019 |
| Protects ME Ltd | Wholesale & retail | 2018 |
| Provest Co. Limited | Administrative & support | 2010 |
| Provisual Limited | Professional & scientific | 1993 |
| PRS Builders London Limited | Construction | 2020 |
| PRS Properties Surrey Ltd | Real estate | 2025 |
| PSH Rigging Ltd | Information & communication | 2019 |
| PSP Logistics Ltd | Administrative & support | 2008 |
| Pumpflo Ltd. | Manufacturing | 2014 |
| Pure Connection Electrical Services Limited | Construction | 2022 |
| Purelux Properties Ltd | Real estate | 2024 |
| Purling Art Games Limited | Professional & scientific | 2017 |
| Q Property Maintenance Limited | Professional & scientific | 2019 |
| Q. Anne House Limited | Households | 2022 |
| Q.R.S (Quick Response Service ) Limited | Wholesale & retail | 2023 |