| Ngroup Resources Limited | Administrative & support | 2008 |
| Nia's Paving Ltd | Construction | 2024 |
| Nibble Technology Limited | Information & communication | 2020 |
| Nibhas Property Investments Limited | Real estate | 2026 |
| NIC S & V Ltd | Transport & logistics | 2020 |
| Nick Norton Limited | Financial services | 2007 |
| Nico Investments Limited | Real estate | 2001 |
| Nicola Pearson Limited | Administrative & support | 2017 |
| Nicp Building Ltd | Construction | 2016 |
| Nigel Carver LLP | | 2023 |
| Nigel Riches Limited | Professional & scientific | 2008 |
| Night Star Consulting Limited | Administrative & support | 2011 |
| Nightfall Management Limited | Professional & scientific | 2023 |
| Nightingale Rise Management Company Limited | Households | 2001 |
| Nihires Limited | Information & communication | 2025 |
| Nihon Club Ltd | Wholesale & retail | 2025 |
| NIK Investigations Ltd | Construction | 2025 |
| Nimfex Ltd | Information & communication | 2025 |
| Nimo Appliance Services CIC | Manufacturing | 2023 |
| Nine Lathom Road Limited | Households | 2025 |
| Nine Medical Services Ltd | Health & social care | 2014 |
| Nine Properties Ltd | Real estate | 2018 |
| Nine Yards Coaching Limited | Professional & scientific | 2023 |
| Ninefifteen Consulting Limited | Administrative & support | 2020 |
| Nirva Store Ltd | Wholesale & retail | 2025 |
| NJC Engineering Ltd. | Administrative & support | 2013 |
| NK Kars Limited | Wholesale & retail | 2013 |
| NKI Consult Ltd | Professional & scientific | 2010 |
| NL Consulting London Limited | Administrative & support | 2014 |
| NLA Associates Limited | Health & social care | 2016 |
| Nldp Ltd | Professional & scientific | 2016 |
| NO 1 Quality Tyres Limited | Manufacturing | 2021 |
| NO Comment Ltd | Wholesale & retail | 2010 |
| NO Rules Productions Ltd | Information & communication | 2024 |
| NO Rules Studios Limited | Real estate | 2026 |
| NO.8 Developments Radlett Ltd | Construction | 2026 |
| Noah Advertising Holdings Limited | Financial services | 2020 |
| Noah Advertising Limited | Professional & scientific | 2009 |
| Noah London Limited | Financial services | 2020 |
| Noah Trustee Limited | Professional & scientific | 2020 |
| Noah's Farm UK Ltd | Agriculture & fishing | 2024 |
| Noap Limited | Real estate | 2026 |
| Noble Autohaus Ltd | Wholesale & retail | 2026 |
| Noble Brit One Limited | Real estate | 2016 |
| Noble Building & Electrical Services Ltd | Construction | 2023 |
| Noble Conglomerate Limited | Financial services | 2019 |
| Noble Investment Property Ltd | Real estate | 2025 |
| Nobledean Limited | Other services | 2019 |
| Noetik Limited | Information & communication | 2009 |
| Noho Film and Television (Coronation) Limited | Information & communication | 2023 |
| Noho Film and Television Limited | Information & communication | 2012 |
| Noise Inc Ltd | Professional & scientific | 2010 |
| Nolik Limited | Transport & logistics | 2023 |
| Nomu Bristol Limited | Hospitality | 2012 |
| Nonica Papageorgiou Limited | Health & social care | 2026 |
| Noodle Bar Bexleyheath Ltd | Hospitality | 2024 |
| Noosa Ventures Limited | Administrative & support | 2012 |
| Nord Sloane Ltd | Information & communication | 2019 |
| Norfolk House Management Company (RTM) Limited | Professional & scientific | 2004 |
| Norge Limited | Wholesale & retail | 2017 |
| Norman Stanley Associates Ltd | Professional & scientific | 2017 |
| Normandy Finance and Investments Limited | Financial services | 1983 |
| Norotec Global Ltd | Information & communication | 2026 |
| Norris Brothers Limited | Real estate | 1954 |
| Norsec Consulting Ltd | Other services | 2017 |
| Norsec Properties Limited | Real estate | 2019 |
| North East HIP and Knee Care Ltd | Health & social care | 2022 |
| North London GAS Ltd | Construction | 2014 |
| North London Hawks Ltd | Education | 2021 |
| North Move Limited | Administrative & support | 2018 |
| North Osteopathy Ltd. | Health & social care | 2014 |
| North Road Management Company Limited | Households | 1986 |
| North Sector Limited | Mining & quarrying | 2014 |
| North West Discount Laundry Services Ltd | Other services | 2023 |
| North West Taxi Engineering Limited | Wholesale & retail | 2002 |
| Northblaze Ltd | Transport & logistics | 2007 |
| Northfield Hand Car Wash Ltd | Other services | 2011 |
| Northside Apartments Ltd | Real estate | 2018 |
| Northstar Property Management Limited | Real estate | 2009 |
| Northwick Terrace Freehold Limited | Households | 2017 |
| Nosmit Limited | Professional & scientific | 2019 |
| Nosnehpetsj Limited | Professional & scientific | 1998 |
| Note to Self Limited | Other services | 2007 |
| Notom Limited | Other services | 2012 |
| Noumenal Ltd | Wholesale & retail | 2026 |
| Noura and Zoya Limited | Wholesale & retail | 2024 |
| Nouri the Barber Ltd | Other services | 2026 |
| Nourish & Bloom Doula Limited | Health & social care | 2025 |
| Nova Chauffeurs Limited | Transport & logistics | 2024 |
| Nova Event Hire Ltd | Hospitality | 2024 |
| Novaham Limited | Health & social care | 2017 |
| Novahealth Medical Imaging Ltd | Health & social care | 2023 |
| Novakt Limited | Construction | 2022 |
| Novello Management Company Limited | Households | 2019 |
| NOW Solutions Ltd | Information & communication | 2005 |
| Nowill Limited | Real estate | 1960 |
| NOX Creations Ltd | Wholesale & retail | 2022 |
| NR Medical Services Ltd | Health & social care | 2018 |
| Nrds Holdings Ltd | Financial services | 2023 |
| NRZ Ltd | Arts & recreation | 2021 |