| NM Skye Ltd | Professional & scientific | 2023 |
| Nmfoods Limited | Hospitality | 2025 |
| NMJ Productions Ltd | Information & communication | 2025 |
| NMK Nails Ltd | Other services | 2024 |
| NND Apartments Ltd | Hospitality | 2023 |
| NO 1 Bootcamp Limited | Arts & recreation | 2016 |
| NO Ordinary Guard Limited | Administrative & support | 2021 |
| NO Pressure.Uk. Ltd | Construction | 2023 |
| NO Risk NO Story Ltd | Manufacturing | 2023 |
| NO1 Fitness Retreats Ltd | Hospitality | 2025 |
| Noah Auto Parts Ltd | Wholesale & retail | 2025 |
| Noah Close Management Company (Enfield) Limited | Households | 2012 |
| Noar Creative Ltd | Manufacturing | 2018 |
| Nobananas Property Ltd | Real estate | 2023 |
| Noble Care Living Ltd | Health & social care | 2025 |
| Noble Gift Packaging Holdings Ltd | Financial services | 2018 |
| Noble Gift Packaging Investments Limited | Real estate | 2018 |
| Noble Gift Packaging Limited | Administrative & support | 1992 |
| Noble Gift Packaging Properties Ltd | Real estate | 2018 |
| Noble Property Investments Limited | Real estate | 2022 |
| Noble X UK Ltd | Financial services | 2026 |
| Noir Enterprises Ltd | Wholesale & retail | 2026 |
| Nokta Ltd | Information & communication | 2023 |
| Nomadica Collective Ltd | Professional & scientific | 2026 |
| Nomadica Crafts Ltd | Manufacturing | 2026 |
| Nomadica Project Ltd | Professional & scientific | 2026 |
| Nomi Trading Ltd | Wholesale & retail | 2025 |
| Noolyn Care Limited | Health & social care | 2019 |
| Noor Real Estate Trading Ltd | Real estate | 2025 |
| Nope.Coffee Ltd | Hospitality | 2026 |
| Norf Design Limited | Construction | 2022 |
| North Local Joinery Boxes and Sashes Ltd | Manufacturing | 2025 |
| North London Accounting Solutions Limited | Professional & scientific | 2001 |
| North London Brickworks Ltd | Construction | 2018 |
| North London Campervans Ltd | Manufacturing | 2024 |
| North London Construction and Building Ltd | Construction | 2022 |
| North London Design & Build Ltd | Construction | 2025 |
| North London Dog Walking Ltd | Other services | 2019 |
| North London Estates Limited | Real estate | 2000 |
| North London Express Limited | Information & communication | 2014 |
| North London Ice Cream Ltd | Hospitality | 2024 |
| North London Joinery Services Ltd | Construction | 2024 |
| North London Land Limited | Construction | 2008 |
| North London Senior Care Ltd | Health & social care | 2016 |
| North London Van and Truck Hire Ltd. | Administrative & support | 1994 |
| North London Wooden Stairs Ltd | Construction | 2023 |
| North Star Academy Ltd | Education | 2024 |
| North Star Building Solutions Limited | Construction | 2019 |
| North West Storage Solutions Limited | Transport & logistics | 2011 |
| Northedge Property Ltd | Real estate | 2025 |
| Northern Natural Casings Ltd | Wholesale & retail | 2026 |
| Northside Hub Ltd | Information & communication | 2025 |
| Northway & Flynn Ltd | Real estate | 2026 |
| Northwest Farm Food Ltd | Wholesale & retail | 2017 |
| Norwich Nails Limited | Other services | 2019 |
| Nostalgiaandnew Limited | Administrative & support | 2017 |
| NOT Grey Ltd | Wholesale & retail | 2020 |
| Notanyoldjo Ltd | Professional & scientific | 2014 |
| Notusfield Limited | Construction | 1990 |
| Nous Holdings Limited | Financial services | 1999 |
| Nous Technology Group Limited | Financial services | 2021 |
| Nouveau Beauty Ltd | Wholesale & retail | 2026 |
| Nouvell Decor INT. Ltd | Real estate | 2021 |
| Nova Frames Limited | Manufacturing | 2015 |
| Nova Media Ltd | Professional & scientific | 2025 |
| Nova Sales and Marketing Limited | Wholesale & retail | 2020 |
| Nova Solicitors Limited | Professional & scientific | 2016 |
| Nova Wholesale Trading Ltd | Wholesale & retail | 2026 |
| Novacrest Financial & Advisory Ltd | Professional & scientific | 2026 |
| Novamill Roofing Limited | Construction | 2024 |
| Novanest Support Services Ltd | Real estate | 2025 |
| NOVANOOK1 Ltd | Wholesale & retail | 2024 |
| Novaqube Limited | Information & communication | 2020 |
| Novara Global Limited | Information & communication | 2024 |
| Novela London Ltd | Other services | 2025 |
| Novela Properties Limited | Real estate | 2006 |
| November Electric Ltd | Construction | 2021 |
| Novex Investments Limited | Real estate | 2017 |
| Novix Pharma Limited | Wholesale & retail | 2026 |
| NOW SHE Knows CIC | Education | 2026 |
| Noya Restaurant Ltd | Other services | 2024 |
| NOYKO-84 Ltd | Transport & logistics | 2018 |
| Nozona Ltd | Hospitality | 2025 |
| NP Estates Global Ltd | Real estate | 2019 |
| NP Facilities Ltd | Water & waste | 2021 |
| NP Property Investment Limited | Real estate | 2025 |
| Npanayotov Limited | Construction | 2010 |
| NPC Events Ltd | Administrative & support | 2022 |
| Nproject Ltd | Wholesale & retail | 2019 |
| Nqnp Ltd | Health & social care | 2025 |
| NQT Limited | Other services | 2021 |
| NRP Plastering & Rendering Ltd | Construction | 2020 |
| NRS Global Ltd | Administrative & support | 2002 |
| NS Fish Ltd | Wholesale & retail | 2022 |
| NS Mega Mart Ltd | Wholesale & retail | 2025 |
| NSA Investments Limited | Real estate | 2025 |
| Nsar Software Ltd | Information & communication | 2021 |
| NSK London Limited | Other services | 2015 |
| NSV Recruitment Limited | Administrative & support | 2020 |
| NT Jewellery Limited | Wholesale & retail | 2022 |