| NN Doors & Windows Limited | Manufacturing | 2025 |
| NN JJ Ltd | Hospitality | 2025 |
| NN1 Invest Limited | Construction | 2020 |
| NN2 Invest Limited | Construction | 2018 |
| NN3 Invest Limited | Construction | 2022 |
| Nnebuogo Consultancy Limited | Information & communication | 2021 |
| NNK Seven Limited | Health & social care | 2016 |
| NNM Properties Limited | Real estate | 2020 |
| NNS Pala UK Ltd | Real estate | 2017 |
| NNT Investments Limited | Real estate | 2021 |
| NNT Lift Company (Fundco 1) Limited | Administrative & support | 2003 |
| NNT Lift Company (Fundco 2) Limited | Administrative & support | 2011 |
| NNT Lift Company Limited | Administrative & support | 2003 |
| NO 29 Management Co (Eastgate) Limited | Real estate | 1999 |
| NO Creep Ltd | Professional & scientific | 2018 |
| NO EYE Deer Properties Ltd | Real estate | 2024 |
| NO Fuss Print Co Ltd | Manufacturing | 2023 |
| NO Guard Alone Foundation Limited | Education | 2026 |
| NO Guard Alone Limited | Health & social care | 2025 |
| NO Hassle Investment Solutions Ltd | Real estate | 2024 |
| NO Hassle Investments Ltd | Real estate | 2021 |
| NO Heroes Brewing Limited | Wholesale & retail | 2018 |
| NO Leaks Plumbing Ltd | Construction | 2012 |
| NO Name Bar and Games (Franchising) Limited | Other services | 2024 |
| NO Need to Paint Limited | Construction | 2019 |
| NO Properties 2 Limited | Financial services | 2026 |
| NO Ratings Studios Ltd | Information & communication | 2024 |
| NO Size Fits ALL Productions Limited | Arts & recreation | 2004 |
| NO Strings Web Ltd | Information & communication | 2026 |
| NO White Flag Limited | Other services | 2009 |
| NO Worries Marketing Solutions Limited | Professional & scientific | 2008 |
| NO Yeye NO Tea Limited | Wholesale & retail | 2025 |
| NO. 1 Claims Management (Leeds) Limited | Administrative & support | 2009 |
| NO. 1 Dock Street Residents Association Limited | Households | 2001 |
| NO. 1 Property Services Ltd | Other services | 2020 |
| NO. 1 Retail Ltd | Wholesale & retail | 2016 |
| NO. 7 Bridge END Ltd | Other services | 2013 |
| NO. 80 Limited | Households | 2025 |
| NO. 9 Kitchen Limited | Construction | 2022 |
| NO.1 Pawfect Pets Ltd | Construction | 2009 |
| NO.1 Property Management Limited | Real estate | 2013 |
| NO.1.COM Limited | Extraterritorial | 2002 |
| NO.2 Bar Ltd | Hospitality | 2024 |
| NO.57 Ltd | Health & social care | 2015 |
| NO.9 Oriental Art Gallery Ltd | Wholesale & retail | 2024 |
| NO11 Properties Limited | Real estate | 2021 |
| NO227 Ltd | Wholesale & retail | 2025 |
| NO8 Nails Ltd | Other services | 2020 |
| Noah and Moon Limited | Arts & recreation | 2023 |
| Noah Properties & Real Estate Ltd | Real estate | 2026 |
| Noash's ARK Joinery Limited | Construction | 2016 |
| Noberne Seals Limited | Construction | 1987 |
| Nobisfields UK Limited | Professional & scientific | 2024 |
| Noble Geotechnical Ltd | Professional & scientific | 2025 |
| Noble Healthcare Services Limited | Health & social care | 2019 |
| Noble Highfield Limited | Real estate | 2011 |
| Noble Invest Limited | Real estate | 2001 |
| Noble Palace Events Limited | Hospitality | 2025 |
| Noble Palace Limited | Hospitality | 2019 |
| Noble Park Ltd | Financial services | 2021 |
| Nobleash Limited | Manufacturing | 2019 |
| Noblestrideit Limited | Information & communication | 2024 |
| Nochain.Ai Limited | Information & communication | 2025 |
| Nochex Limited | Financial services | 2000 |
| Node Group Ltd | Professional & scientific | 2018 |
| Node Property Management UK Limited | Real estate | 2016 |
| Nodesim Ltd | Information & communication | 2026 |
| Nodules and Nodes Ltd | Health & social care | 2025 |
| Noeaeb Ltd | Wholesale & retail | 2019 |
| Noegomusic.Com Limited | Information & communication | 2011 |
| Noel Village (Steel Founder) Limited | Manufacturing | 1980 |
| Noer Ltd | Administrative & support | 2013 |
| Noi's Thai Kitchen Limited | Hospitality | 2021 |
| Noiiz Ltd | Information & communication | 2016 |
| Noir Elite Tanning Ltd | Other services | 2024 |
| Noir Hair House Limited | Other services | 2023 |
| Noir Lets Limited | Real estate | 2023 |
| Noira Community Pubs Ltd | Hospitality | 2026 |
| Noire Label Ltd | Wholesale & retail | 2025 |
| Noirwolf Group Limited | Professional & scientific | 2019 |
| Nola Group Holdings Limited | Administrative & support | 2022 |
| Nolawi Express Logestics Ltd | Transport & logistics | 2026 |
| Nolvik Ltd | Wholesale & retail | 2025 |
| Nomad Africa UK Limited | Financial services | 2023 |
| Nomad Street Limited | Wholesale & retail | 2024 |
| Nomadic TAP Rooms Ltd | Extraterritorial | 2019 |
| Nomadwise Ltd | Information & communication | 2024 |
| Nomaya Ltd | Professional & scientific | 2026 |
| Nomi Entertainment Group Ltd | Wholesale & retail | 2022 |
| Nomik Vision Limited | Wholesale & retail | 2025 |
| Nomis Auhsoj Promotions Ltd | Hospitality | 2025 |
| Nomis Connections Limited | Information & communication | 2003 |
| Nomisma Global Ltd | Wholesale & retail | 2025 |
| Nomitraders Limited | Wholesale & retail | 2025 |
| Nomoreply Limited | Extraterritorial | 2025 |
| Nomz Security and FM Ltd | Administrative & support | 2026 |
| NON Stop Mobile Tyres Ltd | Wholesale & retail | 2025 |
| Nonodigital Ltd | Wholesale & retail | 2026 |
| Nonpareil Cleaning Group Ltd | Administrative & support | 2024 |
| Nonwovens Innovation & Research Institute Limited | Professional & scientific | 2004 |