| NBE Property Solutions Ltd | Construction | 2020 |
| Ncrw Properties Limited | Real estate | 2021 |
| NDN Properties Limited | Construction | 2020 |
| NDT Stoves & Fires Ltd | Construction | 2014 |
| NE Smart Renovations Limited | Construction | 2016 |
| Nead Training Ltd | Professional & scientific | 2015 |
| Neagu Transport Ltd | Transport & logistics | 2022 |
| Neal Tredinnick Limited | Manufacturing | 2013 |
| Nearest Caffe Ltd | Hospitality | 2019 |
| Neethai Restaurant Ltd | Hospitality | 2025 |
| Nehir Market Ltd | Wholesale & retail | 2024 |
| Neotek Electrics Limited | Construction | 2005 |
| Nese Kale Limited | Wholesale & retail | 2016 |
| Nest UK Coffee Ltd | Hospitality | 2024 |
| Neverest Farm Limited | Real estate | 2020 |
| New Adventurers Limited | Health & social care | 2023 |
| New Day Health Ltd | Health & social care | 2026 |
| New Day Property Finance Ltd | Financial services | 2023 |
| New Image Exhibs Limited | Construction | 2018 |
| New Life Broadcast Limited | Information & communication | 2025 |
| New Media Technologies Ltd | Information & communication | 2025 |
| New Venture Properties Ltd | Real estate | 2025 |
| Newbury Farm Management Company Limited | Households | 2025 |
| Newton Brothers Limited | Administrative & support | 2011 |
| Nexgenova Ltd | Hospitality | 2024 |
| Nexhome Ltd | Real estate | 2022 |
| Nextstep Payroll Ltd | Professional & scientific | 2023 |
| NFC Materials Limited | Wholesale & retail | 2026 |
| NG Health Limited | Health & social care | 2024 |
| NI Building Services Ltd | Construction | 2021 |
| Ni-Suwa Properties Ltd | Real estate | 2023 |
| Nice View Limited | Real estate | 2021 |
| Nick Jenkins Limited | Professional & scientific | 2019 |
| Nick Sherwood Ltd | Other services | 2019 |
| Nikgold Group Ltd | Manufacturing | 2025 |
| Nila Ltd | Real estate | 2020 |
| Nirasavi Limited | Professional & scientific | 2023 |
| NIV Staffing Solutions Ltd | Administrative & support | 2017 |
| NJW Hair Limited | Other services | 2002 |
| NL Distribution Limited | Transport & logistics | 2025 |
| NLR Training Ltd | Education | 2025 |
| NLR Transportation Ltd | Wholesale & retail | 2025 |
| NM Property Management Services Limited | Real estate | 2024 |
| NMR (Barking) Ltd | Administrative & support | 2013 |
| NO 76 Haus of Hair Limited | Other services | 2020 |
| NO1 Scrap My Car Ltd | Water & waste | 2020 |
| Noble Balance Ltd | Professional & scientific | 2025 |
| Noble Property Development & Management Limited | Real estate | 2004 |
| North International Trading UK Ltd | Wholesale & retail | 2025 |
| North ‘N South Limited | Real estate | 2020 |
| Northern Thunder Ltd | Other services | 2020 |
| Nosilethu Ltd | Health & social care | 2023 |
| Nostalgia Cafe End-Er Ltd | Hospitality | 2024 |
| Notafi Limited | Information & communication | 2017 |
| Nova Collective Limited | Professional & scientific | 2012 |
| Nova Curation Ltd | Wholesale & retail | 2026 |
| Nova Data Operations One Ltd | Information & communication | 2024 |
| Nova Data Operations Two Ltd | Information & communication | 2024 |
| Nova Data Services Five Ltd | Information & communication | 2024 |
| Nova Data Services Four Ltd | Information & communication | 2024 |
| Nova Data Services Three Ltd | Information & communication | 2024 |
| Nova Data Tech Four Ltd | Information & communication | 2024 |
| Nova Data Tech One Ltd | Information & communication | 2024 |
| Nova Data Tech Two Ltd | Information & communication | 2024 |
| Novacare Pathways Ltd | Administrative & support | 2025 |
| Novo Applications Ltd | Information & communication | 2024 |
| Novo Armory Greenwich Ltd | Arts & recreation | 2021 |
| Novo Assets Ltd | Financial services | 2023 |
| Novo Brands Ltd | Health & social care | 2022 |
| Novo Gym Greenwich Ltd | Health & social care | 2023 |
| Novo Gym Southwark Ltd | Health & social care | 2024 |
| Novo Gym Welling Ltd | Health & social care | 2022 |
| Novo Gyms Ltd | Health & social care | 2022 |
| Novo House Ltd | Real estate | 2019 |
| NRG Brands Ltd | Wholesale & retail | 2020 |
| NSB Holdings Ltd | Construction | 2023 |
| Nsibidi Limited | Manufacturing | 2020 |
| Numbalee Limited | Manufacturing | 2016 |
| Number Twenty Three Consulting Limited | Professional & scientific | 2021 |
| Nursco Healthcare Limited | Administrative & support | 2016 |
| Nurseries for Children Limited | Other services | 2010 |
| Nutmeg Editions Limited | Arts & recreation | 2016 |
| Nysie Rush Marketing Ltd | Professional & scientific | 2023 |
| NZ Catering Ltd | Hospitality | 2025 |
| O'Connell Electrical Services Ltd | Construction | 2023 |
| O'Sullivan & Daughter Ltd | Real estate | 2025 |
| O'Sullivan & Sons Property Ltd | Real estate | 2019 |
| O.Bradley Estates Ltd | Real estate | 2022 |
| Oakdale Trading Limited | Hospitality | 2003 |
| Oakleigh Brook Properties Ltd | Real estate | 2024 |
| Oakleigh Fresh Limited | Agriculture & fishing | 2014 |
| Oakstone Construction Limited | Construction | 2016 |
| Oakwood Properties Limited | Real estate | 2001 |
| Obiageli Ofoma Ltd | Health & social care | 2020 |
| Octagenix Biopharmaceuticals Limited | Manufacturing | 2021 |
| Octagenix Holdings Ltd | Manufacturing | 2021 |
| Octagenix Limited | Professional & scientific | 2017 |
| ODD Music Ltd | Information & communication | 2016 |
| Office Furniture Projects Limited | Wholesale & retail | 2016 |
| Offset Electrical London Ltd | Professional & scientific | 2025 |