| Nevilin Minchev Ltd | Construction | 2015 |
| New Dawn Children's Home Ltd | Health & social care | 2026 |
| New Horizon Care Services Ltd | Other services | 2025 |
| New Option Property Ltd | Real estate | 2024 |
| Newaves Concept Limited | Construction | 2025 |
| Newcon Limited | Construction | 2017 |
| NG Traders Ltd | Wholesale & retail | 2022 |
| Nice Care Services Limited Limited | Health & social care | 2014 |
| Nicholad Limited | Wholesale & retail | 2025 |
| Nicholls Double L Limited | Wholesale & retail | 2003 |
| NIK & JEL Services Ltd | Construction | 2013 |
| Nikey Enterprise Ltd | Wholesale & retail | 2024 |
| Nikistas Ltd | Construction | 2013 |
| Nikys Ltd | Transport & logistics | 2015 |
| Ninna Ltd | Real estate | 2012 |
| Njaa Investment Limited | Professional & scientific | 2025 |
| NKG Ltd | Construction | 2012 |
| NMN Builders Ltd | Construction | 2021 |
| NMV Electrical Services Ltd | Manufacturing | 2016 |
| Nobodies Home Limited | Hospitality | 2025 |
| Noko Ltd | Professional & scientific | 2021 |
| Nonn Electrical Limited | Information & communication | 2021 |
| Noor Construction London Ltd | Construction | 2019 |
| Northpilot Ltd | Financial services | 2026 |
| Noscare Limited | Health & social care | 2016 |
| Nozeel Park Ltd | Health & social care | 2012 |
| NSM Finance Ltd | Administrative & support | 2018 |
| NSM Services Limited | Construction | 2017 |
| NTN Services Ltd | Health & social care | 2023 |
| Nuajez Ltd | Real estate | 2022 |
| Nubian Empress Ltd | Health & social care | 2026 |
| Nudovia Healthcare Ltd | Administrative & support | 2025 |
| Numerouskicks Ltd | Wholesale & retail | 2023 |
| Nyamedze Ltd | Real estate | 2024 |
| Oak-Heirs Limited | Real estate | 2021 |
| Oakston Ltd | Construction | 2024 |
| Obie Careers Limited | Administrative & support | 2023 |
| Ockendon & Chafford Hundred Taxis Limited | Transport & logistics | 2024 |
| Ockendon Eco Laundry Ltd | Other services | 2021 |
| Ockendon Eco Laundry Services Ltd | Other services | 2012 |
| Ockendon Food Ltd | Hospitality | 2024 |
| Ockendon Petrophysical Services Ltd | Mining & quarrying | 2010 |
| October Dias Services (UK) Limited | Administrative & support | 2017 |
| Odoziakuchi Ltd | Manufacturing | 2021 |
| Odukoya Properties Limited | Real estate | 2020 |
| Oemh Ltd | Real estate | 2025 |
| Ogoja James Ltd | Real estate | 2026 |
| OH Group Holdings Limited | Manufacturing | 2023 |
| Ojsp Limited | Wholesale & retail | 2026 |
| OK Cafe Ltd | Hospitality | 2020 |
| OL Solutions Limited | Construction | 2015 |
| Olad Properties Limited | Real estate | 2023 |
| Olaide Services Limited | Health & social care | 2013 |
| Olan Fibre Ltd | Information & communication | 2022 |
| Olivian Cotfas Ltd | Construction | 2025 |
| Oluade Groups Limited | Other services | 2017 |
| OM Pharmacy Limited | Health & social care | 2022 |
| Omar Fish Bar Ltd | Hospitality | 2023 |
| Omega Home Services Ltd | Real estate | 2021 |
| OMG Flowers Ltd | Wholesale & retail | 2024 |
| OMN1POTENT Ltd | Education | 2020 |
| ON My Way Design and Detailing Ltd | Wholesale & retail | 2025 |
| Onbrand Consultancy Limited | Information & communication | 2017 |
| Onix Trans Ltd | Transport & logistics | 2022 |
| Onyx Finance Ltd. | Financial services | 2018 |
| OO Tech Consult Ltd | Information & communication | 2022 |
| Oots Investment Limited | Real estate | 2022 |
| OP Property Services Ltd | Construction | 2026 |
| OPA Property Investment Ltd | Real estate | 2025 |
| Opey Variety Properties Ltd | Real estate | 2022 |
| Optivex Consulting Limited | Information & communication | 2025 |
| Osacam Ltd | Wholesale & retail | 2020 |
| Osbornes Amusements Ltd | Arts & recreation | 2016 |
| Osbourne Static Caravans Limited | Hospitality | 2016 |
| Osom Accounting Services Ltd | Administrative & support | 2016 |
| Osom Painting Services Limited | Construction | 2011 |
| Ossing Finance Ltd | Wholesale & retail | 2019 |
| OTR Team Limited | Information & communication | 2016 |
| OTS Haulage Services Limited | Transport & logistics | 2017 |
| Owen Troy Rohan Ltd | Information & communication | 2023 |
| Oy-Kan Design Ltd. | Professional & scientific | 2017 |
| Ozzy Groups Limited | Financial services | 2016 |
| P & M Management Consulting Limited | Real estate | 2011 |
| P Asumadu Social Care Limited | Public administration | 2022 |
| P&G Installing Ltd | Construction | 2012 |
| P.A.G Construct Ltd | Construction | 2019 |
| PAC Construction Solutions Ltd | Construction | 2025 |
| Paedicare Ltd | Health & social care | 2014 |
| Pamdany Ltd | Health & social care | 2020 |
| Pap's Construction Ltd | Construction | 2015 |
| Paragon Consultancy Group Ltd | Wholesale & retail | 2023 |
| Parakletos Limited | Professional & scientific | 2024 |
| Parimi Holdings Ltd | Health & social care | 2020 |
| Park Lane (Aveley) Management Company Limited | Households | 2022 |
| Park Mews Residents Association (Aveley) Limited | Households | 1987 |
| Parkside Insulation Ltd | Construction | 2023 |
| Parthiancommerce Ltd | Construction | 2024 |
| Pasa 2024 Ltd | Hospitality | 2024 |
| Pasic Services Ltd | Construction | 2023 |
| Paul & Daniela Services Ltd | Water & waste | 2021 |