| Organisation Change Practitioners Limited | Professional & scientific | 2009 |
| Organised Logistic Operations Ltd | Transport & logistics | 2016 |
| Origin Estates & Co Ltd | Hospitality | 2025 |
| Original Drinks Trading Ltd | Financial services | 2026 |
| Orkida Ltd | Health & social care | 2015 |
| Orlando World Limited | Professional & scientific | 2015 |
| Orums Limited | Construction | 2015 |
| OS Textiles Ltd | Wholesale & retail | 2016 |
| Oscar Nelson Limited | Transport & logistics | 2007 |
| Oscaruk Ltd | Construction | 2025 |
| Osmic UK Limited | Information & communication | 2025 |
| OSP Group Ltd | Wholesale & retail | 2022 |
| Ospringe Health and Fitness Limited | Arts & recreation | 2013 |
| Ossm Group Limited | Professional & scientific | 2023 |
| Osteoforall & Wellness Clinic Ltd | Health & social care | 2017 |
| Osteolife Limited | Health & social care | 2009 |
| Ostlers Court (Higham) Management Company Limited | Households | 1991 |
| Oswald Estates Limited | Real estate | 2018 |
| Otabor Finance Limited | Professional & scientific | 2017 |
| OTL Properties Ltd | Real estate | 2020 |
| Otto & Alice Ltd | Professional & scientific | 2013 |
| Ottoman Timber Frame Ltd | Construction | 2019 |
| OUR Mission Limited | Households | 2024 |
| OUT Since Tuesday Limited | Information & communication | 2015 |
| Oval Fish Bar Limited | Hospitality | 2026 |
| Ovydiana Limited | Construction | 2023 |
| Owen Borley's Services Ltd | Manufacturing | 2025 |
| Own 2 Ltd | Information & communication | 2025 |
| Owura Cleaning Services Ltd | Administrative & support | 2023 |
| Oxley Gardens Management Company Limited | Households | 2001 |
| Oxley Gardens Residents Association Limited | Real estate | 2000 |
| Oyede Ltd | Real estate | 2023 |
| Ozcville Properties Ltd | Real estate | 2021 |
| P & J Business Concepts Limited | Other services | 2017 |
| P J Drylining Ltd | Construction | 2014 |
| P J Mahoney Limited | Construction | 2007 |
| P J Office Services Ltd | Other services | 2002 |
| P S Window Cleaning Ltd | Administrative & support | 2016 |
| P W Safety Limited | Professional & scientific | 2004 |
| P&L Porter Legacies Ltd | Construction | 2022 |
| P&N Research Ltd | Administrative & support | 2025 |
| P&S Properties (South East) Ltd | Other services | 2014 |
| P.L. Davies Limited | Wholesale & retail | 2000 |
| P26 Civils Ltd | Construction | 2023 |
| PA Forrest Property Limited | Real estate | 2019 |
| PA Solutions (South East) Ltd | Administrative & support | 2016 |
| Pablo Romeo Limited | Construction | 2025 |
| PACHAS02 Limited | Hospitality | 2026 |
| Pachnidlo Ltd | Wholesale & retail | 2025 |
| Packhorse Inn South Brent Ltd | Hospitality | 2023 |
| PAD Property Care Solutions Limited | Administrative & support | 2013 |
| PAD Resources Ltd | Information & communication | 2016 |
| Paddington Community Homes Limited | Health & social care | 2024 |
| Padimms Ltd | Hospitality | 2026 |
| Pagati Ltd | Professional & scientific | 2021 |
| Page Lacquer Company Limited | Manufacturing | 1988 |
| Paiges Equine Services Ltd | Agriculture & fishing | 2024 |
| Paisley ECB Ltd | Wholesale & retail | 2025 |
| Pajah and I.J (SL) Limited | Wholesale & retail | 2025 |
| Palace Windows and Doors Limited | Construction | 2004 |
| Paladin Secure Limited | Administrative & support | 2010 |
| Palaston Limited | Construction | 2007 |
| Palmerton Fitness Ltd | Arts & recreation | 2024 |
| Palms & Cedars Ltd | Real estate | 2026 |
| PAM Investments Ltd | Extraterritorial | 2016 |
| Pama Construction Limited | Construction | 2008 |
| Pamc Transport Ltd | Transport & logistics | 2023 |
| Pamfy Trans Limited | Transport & logistics | 2016 |
| Pampered Paws Ltd | Other services | 2025 |
| Pamytrans Ltd | Transport & logistics | 2014 |
| Panacea Maintenance Ltd | Construction | 2018 |
| Panacea UK Group Ltd. | Construction | 2013 |
| Panel Paint Limited | Wholesale & retail | 2017 |
| Panimer Imports Ltd | Wholesale & retail | 2018 |
| Pantheons Construction Limited | Construction | 2023 |
| Paper Planet London Ltd | Wholesale & retail | 2023 |
| Papyrus RRR Limited | Water & waste | 2012 |
| Paradigm Estates SE Ltd | Real estate | 2025 |
| Paradise Street Barber Shop Limited | Other services | 2024 |
| Paradise Vapes Limited | Wholesale & retail | 2024 |
| Paragon Rail Ltd | Other services | 2018 |
| Paragon Services South East Limited | Construction | 2019 |
| Paramount Construction Group Ltd | Construction | 2024 |
| Paramount Contracting Ltd | Extraterritorial | 2015 |
| Paramount Panel and Paint Ltd | Wholesale & retail | 2016 |
| Paramount Paving and Landscaping Ltd | Construction | 2022 |
| Parapet Consultants Limited | Information & communication | 1999 |
| Parcelstarlogistics Limited | Transport & logistics | 2025 |
| Parentteen Network Limited | Education | 2025 |
| Parish Gate (Sidcup) Management Company Limited | Households | 1983 |
| Park Chairs Limited | Other services | 2025 |
| Park Drive Court (Ramsgate) Management Limited | Households | 2000 |
| Parkdeck Chairs Ltd | Other services | 2000 |
| Parke Investments Limited | Financial services | 2018 |
| Parke IT Solutions Ltd | Information & communication | 2018 |
| Parke Properties Limited | Real estate | 2020 |
| Parkside Design Projects Ltd | Professional & scientific | 2023 |
| Parkview Gravesend Limited | Households | 1988 |
| Paro Tuition Ltd | Education | 2016 |
| Paronga Ltd | Professional & scientific | 2016 |