| Nichesys Limited | Information & communication | 2010 |
| Nicholls Painting Services Limited | Construction | 2015 |
| Nicks Vehicle Repairs Limited | Wholesale & retail | 2022 |
| Nicolas Ablitt Hair Studio Ltd | Other services | 2013 |
| Nicsa Logistics Ltd | Transport & logistics | 2014 |
| Nightingill Publishing Limited | Information & communication | 2024 |
| NK Sellers Limited | Wholesale & retail | 2023 |
| NO Matter What Productions Limited | Information & communication | 2025 |
| Noakes Properties Limited | Administrative & support | 2009 |
| Norden Draughting Limited | Professional & scientific | 2005 |
| Nordic Timber Limited | Wholesale & retail | 2017 |
| Norman Gutteridge Limited | Construction | 1977 |
| Normee Consulting Ltd | Administrative & support | 2023 |
| Norpa Limited | Health & social care | 2013 |
| North Elevation Ltd | Construction | 2019 |
| Nova Orbis Essex Ltd | Real estate | 2024 |
| Nova Orbis Fleet Services Ltd | Administrative & support | 2023 |
| Nova Orbis Healthcare Ltd | Health & social care | 2023 |
| Nova Orbis Holdings Ltd | Financial services | 2023 |
| Nova Orbis Investment Ltd | Financial services | 2023 |
| Nova Orbis Property Ltd | Households | 2023 |
| Novacom Networks Limited | Information & communication | 2018 |
| Novatech Talent Ltd | Information & communication | 2025 |
| NSL National Sealants Ltd | Construction | 2025 |
| NTG Carpentry Ltd | Construction | 2023 |
| NXT Agricultural Limited | Wholesale & retail | 2025 |
| O Capel Global Limited | Construction | 2016 |
| O'Brien Luxury Homes Limited | Construction | 2018 |
| Oakjoten Ltd | Professional & scientific | 2021 |
| Oasis UK North Limited | Administrative & support | 1991 |
| Objective Logistics Ltd | Transport & logistics | 2016 |
| Obraz Ltd | Transport & logistics | 2025 |
| OC Group Services Ltd | Professional & scientific | 2025 |
| Ocassionsown Ltd | Professional & scientific | 2025 |
| OCC Healthcare Ltd | Health & social care | 2024 |
| Ocean Blue Honu Ltd | Wholesale & retail | 2020 |
| Octane Operations Ltd | Information & communication | 2025 |
| Offsite Archive Storage and Integrated Services (UK) Limited | Administrative & support | 2008 |
| Ojury Estates Limited | Real estate | 2022 |
| Oliver Electrical Installations Ltd | Construction | 2017 |
| Oliver Rails Limited | Construction | 2006 |
| Oneservicestrip Ltd | Administrative & support | 2026 |
| Osborne Co-Operative Academy Trust | Education | 2011 |
| OSE Anegbe Ltd | Administrative & support | 2017 |
| Owen and Avery Construction Limited | Construction | 2015 |
| Oxford Medico-Legal Clinicians Limited | Health & social care | 2016 |
| P L Hymas Ltd. | Professional & scientific | 2017 |
| P.R. Coote Limited | Construction | 2017 |
| Page Project Services Ltd | Professional & scientific | 2020 |
| Park House Management (Corringham) Limited | Households | 1999 |
| Parker 12 Investments Limited | Real estate | 2020 |
| Pastusenco Limited | Construction | 2015 |
| PAT Testing 247 Limited | Professional & scientific | 2024 |
| Patrimony EV Limited | Professional & scientific | 2020 |
| Paul Mapley Limited | Construction | 2014 |
| Paumatbuilding Ltd | Construction | 2018 |
| PAV Haulage (Northern) Ltd | Transport & logistics | 2026 |
| PAV Haulage Ltd | Transport & logistics | 2014 |
| Pave World Ltd | Construction | 2007 |
| PCP Cabling London Limited | Information & communication | 2025 |
| Pegasus Windows & Doors Ltd | Construction | 2023 |
| Penge After School Club Ltd | Education | 2020 |
| Penmans Law Limited | Professional & scientific | 2020 |
| Penny Creative Ltd | Professional & scientific | 2023 |
| Penrose (Essex) Limited | Construction | 1980 |
| Penrose Properties (Essex) Ltd | Extraterritorial | 2021 |
| Pepperlink Property Management Limited | Administrative & support | 1997 |
| Perennia Climate Services Ltd | Construction | 2026 |
| Perfect Facades Constructions Ltd | Construction | 2017 |
| Perfection World 21 Ltd | Construction | 2021 |
| Periscope Design Solutions Limited | Administrative & support | 2000 |
| Perry Construction Ltd | Construction | 2025 |
| Perspicuus Ltd | Professional & scientific | 2024 |
| Pewees Ltd | Wholesale & retail | 2017 |
| Pgsr Ltd | Construction | 2022 |
| PGV Group Ltd | Manufacturing | 2015 |
| Phillips Power Ltd | Professional & scientific | 2019 |
| Phoenix Technical Services (Essex) Ltd | Professional & scientific | 2023 |
| Phummy Ltd | Health & social care | 2019 |
| Physiomech Ltd | Health & social care | 2009 |
| Pippa's Building Services Ltd | Construction | 2024 |
| Pipro.Online Limited | Real estate | 2019 |
| Pjsj Limited | Construction | 2016 |
| PKF Properties Limited | Construction | 2017 |
| PKF Property Investments Limited | Real estate | 2025 |
| Plant & Machinery Ltd | Education | 2024 |
| Plant Assessment Limited | Construction | 2019 |
| Platinum Electronic Security Limited | Construction | 2011 |
| Plugged Creative Ltd | Administrative & support | 2015 |
| Plumber on TAP Ltd | Construction | 2019 |
| Pradyun Limited | Health & social care | 2011 |
| Pray the Word Ministries | Other services | 2010 |
| Predina Estates Ltd | Construction | 2024 |
| Predina Holdings Ltd | Financial services | 2026 |
| Predina Investments Ltd | Financial services | 2026 |
| Predina LLP | | 2012 |
| Predina Property Ltd | Real estate | 2020 |
| Premier Cleaning & Maintenance Ltd | Administrative & support | 2025 |
| Premier DJ Limited | Other services | 2018 |
| Premier Reclaim Limited | Manufacturing | 2025 |