| Onepiecejigsaw Ltd. | Information & communication | 2011 |
| OOM Drinks Ltd | Wholesale & retail | 2023 |
| Optimal DHN Ltd | Professional & scientific | 2022 |
| Optrium Ltd | Information & communication | 2024 |
| Optume MFA Limited | Health & social care | 2025 |
| Orchestrator AI Ltd | Information & communication | 2026 |
| Orpin Limited | Real estate | 2026 |
| Osborn Associates Limited | Professional & scientific | 1994 |
| Osborn Continental Limited | Transport & logistics | 2004 |
| Osborn Contractors Ltd | Construction | 2025 |
| Osbourne House ( Langley Park ) RTM Company Limited | Households | 2016 |
| Otford Computing Services (OCS) Limited | Administrative & support | 1990 |
| Outstanding Builders Limited | Construction | 2002 |
| P General Group Ltd | Other services | 2018 |
| P.O.W. Terrace Limited | Real estate | 2022 |
| Pacific Heights Management Limited | Households | 2001 |
| Pags Holdings Limited | Financial services | 2015 |
| Paisa Finance Limited | Real estate | 2022 |
| Paisa Properties Ltd | Real estate | 2020 |
| Palan Media Limited | Administrative & support | 2013 |
| Pamken Limited | Real estate | 2013 |
| Panther Mechanical & Plumbing Services Limited | Construction | 2009 |
| Park Court Residents Limited | Households | 2001 |
| Park Gates (Guildford) Residents Management Company Limited | Households | 1996 |
| Parkside (Beckenham) Limited | Real estate | 2018 |
| Parkwell Limited | Professional & scientific | 1999 |
| Parma Violets Car Leasing & Sales Ltd | Wholesale & retail | 2023 |
| Partridge Enterprises Ltd | Administrative & support | 2009 |
| Peach Boulevard Ltd | Wholesale & retail | 2020 |
| Pedalglass Limited | Wholesale & retail | 2006 |
| Pelton Court (Freehold) Limited | Households | 1993 |
| Peoplefact Limited | Professional & scientific | 2003 |
| PER Group Limited | Construction | 2025 |
| Pergamano International Limited | Manufacturing | 2017 |
| Period Homes Ltd | Construction | 2009 |
| Perrett Consulting Ltd | Professional & scientific | 2022 |
| PFB Holdings Ltd | Real estate | 2019 |
| PFB Telecoms Ltd | Information & communication | 2014 |
| PGA London Limited | Transport & logistics | 2013 |
| PGW Cleaning Ltd | Administrative & support | 2020 |
| Pharmaceutical Direct Limited | Wholesale & retail | 2014 |
| Pharmaclarity Limited | Manufacturing | 2015 |
| Phase Electrical Services (UK) Limited | Construction | 2009 |
| Philip Adamson Consulting Limited | Information & communication | 2013 |
| Phoenix Fire and Electrical Systems Ltd | Construction | 2016 |
| Phones for Business Limited | Information & communication | 2005 |
| Picknickity Limited | Real estate | 2018 |
| PIM Studios Limited | Professional & scientific | 2015 |
| Pine Tree Lodge Management Company Limited | Households | 1993 |
| PJR Accountancy Ltd | Professional & scientific | 2020 |
| Platform Property Ltd. | Real estate | 2015 |
| Pmps Limited | Extraterritorial | 2009 |
| Pool Pipe & Fitting Co. Limited | Manufacturing | 2005 |
| Popina Guide Ltd | Professional & scientific | 2023 |
| Porpoise Productions Limited | Information & communication | 2002 |
| Portray Limited | Professional & scientific | 2009 |
| Powered Flowers Limited | Information & communication | 2011 |
| PPI Holdings Limited | Financial services | 2003 |
| Premiumkilndriedlogs Ltd | Wholesale & retail | 2024 |
| Primex Services Limited | Real estate | 1998 |
| Prizecomparison Ltd | Information & communication | 2026 |
| Probuild Supplements Ltd | Wholesale & retail | 2024 |
| Professio Recruitment Ltd | Administrative & support | 2023 |
| Professional Trustees Limited | Information & communication | 1999 |
| Promohire Ltd | Extraterritorial | 2006 |
| Pronto Bistro Limited | Hospitality | 2019 |
| Pronto Gastro Limited | Hospitality | 2018 |
| Property Power Real Estate Ltd. | Real estate | 2018 |
| Property Power Real Estate South East Limited | Real estate | 2022 |
| Protec Event Services Limited | Administrative & support | 2025 |
| Protek Group Limited | Financial services | 2015 |
| Punk Dog Limited | Real estate | 2016 |
| Purbeck Residents Association Limited | Households | 1982 |
| Pure Renovations Limited | Construction | 2013 |
| Pureflow Technologies Ltd | Information & communication | 2026 |
| Purple Carrot Foods Ltd | Wholesale & retail | 2023 |
| Pvyasproperties Limited | Real estate | 2023 |
| Q Road Reading Limited | Real estate | 2021 |
| Q2V Ltd | Professional & scientific | 2021 |
| Qcbe Limited | Households | 2017 |
| Quantra Limited | Construction | 1988 |
| Quantum FM Solutions Ltd | Administrative & support | 2016 |
| Qubitec Installations Ltd | Information & communication | 2026 |
| Qubitec Limited | Other services | 2018 |
| Quire Capital Holdings Limited | Financial services | 2025 |
| Quire Capital Management Limited | Professional & scientific | 2025 |
| R M Ponds & Landscaping Limited | Administrative & support | 2016 |
| R Mounger Ltd | Construction | 2024 |
| R&G Beauty Limited | Other services | 2025 |
| R&R Detailing Ltd | Manufacturing | 2016 |
| R.J. Holland (Holdings) Limited | Real estate | 1946 |
| Raccoon (London) Limited | Manufacturing | 2009 |
| Raffael's Grand Concierge Services Ltd | Administrative & support | 2024 |
| Raksnim Properties Ltd | Real estate | 2018 |
| Raven AV Ltd | Professional & scientific | 2020 |
| RDE Projects Ltd | Administrative & support | 2024 |
| Re-Line Aesthetics Limited | Other services | 2022 |
| React Plumbing & Heating Limited | Construction | 2015 |
| Reading + West Architects LLP | | 2007 |
| Real Estate Partnership 2012 LLP | | 2012 |