| One Analytica Ltd | Information & communication | 2023 |
| Only Footcare Ltd | Administrative & support | 2019 |
| Opal Carers Ltd | Health & social care | 2020 |
| Opportunity Knox Entertainment Ltd | Arts & recreation | 2016 |
| Optimum ERP Ltd | Information & communication | 2023 |
| Orange and Red Limited | Construction | 2014 |
| Orchard Greenway LLP | | 2021 |
| Orme House Management Limited | Households | 1991 |
| Oscaroo Investments Ltd | Real estate | 2023 |
| Oscaroo Property Ltd | Real estate | 2015 |
| Ostra Studio Ltd | Wholesale & retail | 2025 |
| Oswald Group Ltd | Administrative & support | 2022 |
| Otoloci Ltd | Education | 2016 |
| OUR Facilities Management Ltd | Administrative & support | 2016 |
| OUT Source Limited | Professional & scientific | 1991 |
| Outback Horizons Limited | Administrative & support | 2025 |
| Outdoor Leisure Pursuits Limited | Arts & recreation | 2012 |
| Oval Freeholder Limited | Administrative & support | 2017 |
| Owele Cleaning Solutions Ltd | Administrative & support | 2026 |
| OWL Garden Studios Ltd | Construction | 2026 |
| Oyster Grey Ltd | Real estate | 2014 |
| P Clark Associates Limited | Administrative & support | 2014 |
| P F B Production Limited | Arts & recreation | 2014 |
| P Morgan Scaffolding Ltd. | Construction | 2011 |
| P S Allan Electrical Ltd | Construction | 2015 |
| P&C Services LLP | | 2016 |
| P&O Property Ltd | Real estate | 2017 |
| P.Hills Heating Ltd | Construction | 2026 |
| P.R. Jones (Scaffold Hire Surrey) Limited | Construction | 1999 |
| P.R. Jones (Scaffold Hire) Limited | Construction | 1999 |
| PA Property Nest Ltd | Real estate | 2024 |
| Pacey Project Consultancy Ltd | Agriculture & fishing | 2020 |
| Pacific LS Services Ltd | Administrative & support | 2025 |
| Packham Carpentry and Construction Limited | Construction | 2009 |
| PAE Consulting Limited | Information & communication | 2013 |
| Palma Black Consulting Ltd. | Information & communication | 2017 |
| Palmer Property Investments Limited | Real estate | 2016 |
| Pampellonne Real Estate Limited | Real estate | 2019 |
| Pamper Parties Kent Limited | Other services | 2026 |
| Panda Caterham Limited | Hospitality | 2022 |
| Paradine Global Limited | Arts & recreation | 2020 |
| Paradise Construction Projects Ltd | Administrative & support | 2025 |
| Paragon Roadmarking Limited | Construction | 2000 |
| Paramount Builders & Contractors Ltd | Construction | 2023 |
| Parenting Matters Ltd | Health & social care | 2004 |
| Park & Bailey (Coulsdon) Limited | Real estate | 2003 |
| Park & Bailey (Woldingham) Limited | Real estate | 2011 |
| Park & Bailey Estate Agents Limited | Real estate | 1986 |
| Park & Bailey Lettings and Management Limited | Real estate | 1999 |
| Park & Bailey Limited | Real estate | 1995 |
| Park & Bailey Southern Limited | Real estate | 2011 |
| Park Court Management (Croydon) Limited | Households | 2023 |
| Park Quarter (Caterham) Management Company Limited | Administrative & support | 2008 |
| Park View (Caterham) Management Company Limited | Administrative & support | 2005 |
| Parkes & Swan Limited | Professional & scientific | 2009 |
| Pathway Arts Academy Ltd | Education | 2024 |
| Patricia Corbett Occupational Therapy Services Limited | Administrative & support | 2009 |
| Pattisons of Tattenham Ltd | Hospitality | 2018 |
| Paul Stock Limited | Real estate | 2024 |
| Paving Doctor Ltd | Construction | 2008 |
| Pawame UK Limited | Wholesale & retail | 2020 |
| Payne's Pet Care Limited | Other services | 2019 |
| PC Infotech Ltd | Information & communication | 2020 |
| PCU Associates Limited | Real estate | 2016 |
| Pd-Builders Ltd | Construction | 2022 |
| PDS Electrical Services LLP | | 2023 |
| Peachey & Co (Accountants) Limited | Professional & scientific | 2006 |
| Peachey & Co (Holdings) Limited | Real estate | 2021 |
| Peachez Ltd | Professional & scientific | 2022 |
| Perfect Dispense Services Ltd | Administrative & support | 2013 |
| Perfect Kebab Ltd | Hospitality | 2018 |
| Periander Ltd | Professional & scientific | 2013 |
| Personal Cars (London) Ltd | Transport & logistics | 2006 |
| Personalised by MI Ltd | Wholesale & retail | 2025 |
| Peters & Co Consulting Ltd | Administrative & support | 2023 |
| PG Tippers Ltd | Water & waste | 1993 |
| Phase 1 (Surrey) Ltd | Construction | 2023 |
| Philama Company Ltd | Administrative & support | 2026 |
| Philip&Sonsconstructionltd Limited | Construction | 2021 |
| Phillip Kent & Associates Ltd | Professional & scientific | 2005 |
| Phoenix Seafoods (UK) Ltd | Wholesale & retail | 2021 |
| Phoenix Serve Limited | Professional & scientific | 2025 |
| Piermont Holdings Limited | Health & social care | 2005 |
| Pietas Consulting Limited | Professional & scientific | 2012 |
| Pihf Media Ltd | Information & communication | 2026 |
| Piller Engineering Ltd | Professional & scientific | 2014 |
| Pinewood House RTM Ltd | Construction | 2015 |
| PJ O Donovan Construction Ltd | Construction | 2020 |
| Pjlr Consulting Limited | Professional & scientific | 2012 |
| PJM Insurance Consultants Limited | Financial services | 2009 |
| PKF Solutions Limited | Professional & scientific | 2010 |
| Planet FOX Ltd | Education | 2023 |
| Plush Plates Limited | Other services | 2020 |
| PNF Marketing Ltd | Professional & scientific | 2025 |
| Polaris Praxis Ltd | Professional & scientific | 2025 |
| POOLS2U Ltd | Education | 2025 |
| Poon Enterprise Limited | Other services | 2010 |
| Poplar Estates Limited | Real estate | 2013 |
| Portgreen Properties Limited | Construction | 2003 |
| Portman Market Access Solutions Limited | Professional & scientific | 2023 |