| O.B. Regency Property Management Ltd | Real estate | 2011 |
| O2 Care Ltd | Health & social care | 2023 |
| OA Olympus Medical Services Ltd | Health & social care | 2025 |
| Oak and Sons Developments Ltd | Construction | 2025 |
| Oak Dental Limited | Health & social care | 2013 |
| Oaks Flooring Limited | Wholesale & retail | 1998 |
| Oaks Holdings Ltd | Real estate | 2026 |
| Oasis Brothers Ltd | Professional & scientific | 2007 |
| Oasis Carol Limited | Wholesale & retail | 2024 |
| Oasis CP Projects Ltd | Construction | 2022 |
| Obequine Ltd | Arts & recreation | 2013 |
| OE 1ST XV Ltd | Arts & recreation | 2020 |
| Offgrid Energy Labs Limited | Manufacturing | 2025 |
| OHM Cleaning Ltd | Other services | 2014 |
| Okane Consultancy Ltd | Information & communication | 2014 |
| Olatade (UK) Limited | Wholesale & retail | 2012 |
| Oldfield Road Property Investments Ltd | Real estate | 2024 |
| Olivias Treasure Ltd | Real estate | 2023 |
| Ollywood Services Limited | Information & communication | 2024 |
| Olojuanu Limited | Health & social care | 2014 |
| Olumit Limited | Information & communication | 2012 |
| Olumè Ltd | Wholesale & retail | 2022 |
| Omega GEE Limited | Professional & scientific | 2014 |
| Omega Villas Ltd | Real estate | 2019 |
| Ondoeast-It Services Limited | Information & communication | 2017 |
| One Dreamz Ltd | Wholesale & retail | 2021 |
| One Solution Hub Ltd | Administrative & support | 2024 |
| One Stop Lift Consultancy Limited | Professional & scientific | 2018 |
| One Travel Phone Limited | Information & communication | 2021 |
| One&Only Asset Management Ltd. | Real estate | 2024 |
| Onecircle Ltd | Information & communication | 2025 |
| Ong-Organization AID for Children of WAR Ltd | Education | 2025 |
| Onsite Facilities Limited | Other services | 2004 |
| Ophrah Oak Ltd | Health & social care | 2013 |
| Optimism Design Limited | Professional & scientific | 1999 |
| Optimum Electrical Limited | Construction | 1989 |
| Optimum Thermal Services Ltd | Administrative & support | 2022 |
| Orchard Court (Sidcup) Limited | Households | 2001 |
| Orchard Digital Limited | Information & communication | 2016 |
| Ordell Limited | Professional & scientific | 2018 |
| Oriazest Ltd | Wholesale & retail | 2025 |
| Ought Trading Limited | Wholesale & retail | 2024 |
| OUR Little Shoe Box Ltd | Wholesale & retail | 2013 |
| OUR PAD Your Paws Ltd | Other services | 2017 |
| OUT on a Limb Treecare Ltd | Administrative & support | 2022 |
| Overlooked Ltd | Information & communication | 2023 |
| Ovika Labs Ltd | Information & communication | 2026 |
| Ovolo London Limited | Construction | 2020 |
| Oxendale Enterprises Ltd | Financial services | 2023 |
| Oxendale FIC Ltd | Other services | 2025 |
| Ozcan Barbers Ltd | Other services | 2020 |
| Ozmo Health Ltd | Health & social care | 2024 |
| P & R Partitions and Ceilings Ltd. | Construction | 2012 |
| P S CAB Service Limited | Transport & logistics | 2003 |
| P.M.L. Sign Services Limited | Construction | 2002 |
| P2BS One Limited | Construction | 2020 |
| P2BS Three Limited | Construction | 2020 |
| P2BS Two Limited | Construction | 2020 |
| PAA Services Ltd. | Professional & scientific | 2015 |
| Pace Express Worldwide Ltd | Wholesale & retail | 2024 |
| Padley Plumbing & Heating Ltd | Construction | 2016 |
| Paint My House Limited | Construction | 2013 |
| Pajk Consultancy Limited | Professional & scientific | 2021 |
| Palace Grove Management Limited | Real estate | 2002 |
| Pall Capital Ltd | Construction | 2024 |
| Pally Talk Limited | Administrative & support | 2025 |
| Palmavera Limited | Hospitality | 2008 |
| Panel Perfect Limited | Wholesale & retail | 2001 |
| Panel Perfect Mobile Limited | Wholesale & retail | 2022 |
| Parabolic View Limited | Construction | 2022 |
| Paradigmpeople Ltd | Information & communication | 2017 |
| Park Crescent Property Management Limited | Households | 2004 |
| Park House (Sidcup) Maintenance Limited | Households | 1969 |
| Parkdale Development Ltd | Construction | 2020 |
| Parker's Pre-Schools Ltd | Administrative & support | 2015 |
| Parkhill (Bexley) Management Limited | Households | 1985 |
| Parkview Property Services Limited | Real estate | 2000 |
| Parmar Advisory Ltd | Professional & scientific | 2016 |
| Pass at First Ltd | Information & communication | 2025 |
| Patel Transport Ltd | Transport & logistics | 2024 |
| Patelcrest Limited | Construction | 1985 |
| Patrick Frank Hickey Consultant Adviser Ltd | Professional & scientific | 2025 |
| Patrick James Legal Solutions Limited | Professional & scientific | 2024 |
| Paul Harding Electrical Limited | Administrative & support | 2017 |
| Paul's Hair Salons Limited | Other services | 2000 |
| Payal London Consolidated Limited | Wholesale & retail | 1983 |
| Payment Services Integrators Limited | Information & communication | 2012 |
| Paymentsi Developments Ltd | Information & communication | 2025 |
| Paymentsi Group Ltd | Financial services | 2025 |
| PC Pharmacies Limited | Wholesale & retail | 2011 |
| PC Property Developments Ltd | Real estate | 2019 |
| PCD Albany Terrace Limited | Real estate | 2016 |
| PCD Borough Road Limited | Real estate | 2020 |
| PCD Chatham Limited | Construction | 2014 |
| PCD Chatham Properties Limited | Construction | 2024 |
| PCD Contractors Limited | Construction | 2014 |
| PCD Homes Gillingham Limited | Real estate | 2015 |
| PCD Homes New Road Limited | Real estate | 2018 |
| PCD Investments Limited | Construction | 2017 |
| PCD Nelson Road Ltd | Real estate | 2019 |