| NKM Estates Limited | Real estate | 2025 |
| NKO Property Limited | Real estate | 2024 |
| Nlbc (UK) Trading Limited | Education | 2020 |
| NLD Media Limited | Professional & scientific | 2021 |
| NLD Transport Ltd | Transport & logistics | 2023 |
| NLG Speed Ltd | Transport & logistics | 2021 |
| NLP Property Solutions Limited | Households | 2022 |
| NLP Records Ltd | Information & communication | 2026 |
| NLS Logistics Ltd | Transport & logistics | 2014 |
| Nltm Limited | Health & social care | 2024 |
| NM Group Ltd | Financial services | 2016 |
| NME Electrical Services Limited | Construction | 2001 |
| NMN Trans Ltd | Transport & logistics | 2019 |
| Nmoira Limited | Wholesale & retail | 2026 |
| NMS Metal Works Limited | Construction | 2016 |
| NMS Trans Ltd | Transport & logistics | 2019 |
| Nmsh Holdings Ltd | Administrative & support | 2022 |
| NN Active Ltd | Arts & recreation | 2025 |
| NN Central Management Limited | Households | 2003 |
| NN Commercial Cleaning Ltd | Administrative & support | 2023 |
| NN Drainage Ltd | Water & waste | 2023 |
| NN Enterprises Ltd | Information & communication | 2024 |
| NN Estates Limited | Real estate | 2015 |
| NN Eurotrans Ltd | Transport & logistics | 2016 |
| NN Marine Ltd | Transport & logistics | 2022 |
| NN Paving Ltd | Construction | 2018 |
| NN Project Limited | Hospitality | 2017 |
| NN Property Group Ltd | Real estate | 2024 |
| NN Transport Ltd | Transport & logistics | 2024 |
| NN Transport Services Ltd | Administrative & support | 2019 |
| NN Transport Solutions Ltd | Transport & logistics | 2026 |
| NN Window Cleaning Croydon Limited | Administrative & support | 2025 |
| NN Window Cleaning Limited | Administrative & support | 2025 |
| NN Window Cleaning Milton Keynes Limited | Administrative & support | 2025 |
| NN Window Cleaning Northampton Limited | Administrative & support | 2025 |
| NN1 Personnel Ltd | Administrative & support | 2015 |
| NN2 Holdings Limited | Hospitality | 2025 |
| NN3 (2014) Ltd. | Real estate | 2014 |
| NN4 Traders Ltd | Professional & scientific | 2020 |
| NN7 Properties Ltd | Real estate | 2024 |
| Nnbn Ltd | Information & communication | 2022 |
| Nnds Campbell Limited | Financial services | 2024 |
| Nnora Ltd | Hospitality | 2019 |
| Nnpu Limited | Hospitality | 2022 |
| NO 3 Highpost Ltd | Hospitality | 2016 |
| NO 68 Coffee House Limited | Extraterritorial | 2024 |
| NO 7 Blackpool Limited | Hospitality | 2018 |
| NO Cake Media Limited | Information & communication | 2024 |
| NO Fuss Meals for Busy Parents CIC | Agriculture & fishing | 2023 |
| NO Space Ventures Ltd | Wholesale & retail | 2026 |
| NO.1 Auto Salvage Limited | Wholesale & retail | 2014 |
| NO.56 Aesthetics Ltd | Other services | 2022 |
| NO1 Boutique at Solpark Ltd | Wholesale & retail | 2020 |
| Noah Barber Limited | Other services | 2024 |
| Noah's Transport Ltd | Transport & logistics | 2025 |
| Noah`S ARK Environmental Services Ltd | Other services | 2008 |
| Noakes Limited | Information & communication | 2009 |
| Noble & Lamb Ltd | Construction | 2023 |
| Noble & Stone Ltd | Construction | 2022 |
| Noble Barber Ltd | Other services | 2025 |
| Noble Boulder Restaurant Ltd | Hospitality | 2018 |
| Noble Competitions Ltd | Wholesale & retail | 2025 |
| Noble Horizon Capital Ltd | Financial services | 2025 |
| Noble Horizon Developments Ltd | Real estate | 2025 |
| Noble Horizon Property Ltd | Financial services | 2024 |
| Noble Mechanical Services Limited | Construction | 2020 |
| Noble Properties Limited | Real estate | 2018 |
| Noble Scaffolding Limited | Construction | 2016 |
| Nobles Engineering Solutions Limited | Manufacturing | 2000 |
| Noblestar Technologies Ltd | Information & communication | 2021 |
| Noblewood Carpentry Ltd | Construction | 2018 |
| Nobleworld Limited | Administrative & support | 2014 |
| Nocadeane Holdings (UK) Limited | Administrative & support | 2009 |
| Nocca Holdings Limited | Real estate | 2025 |
| Nocca Partners Limited | Real estate | 2020 |
| Nocliva Holdings UK Ltd | Real estate | 2021 |
| Noctis Gaming Ltd | Manufacturing | 2019 |
| Nocturnal Behaviour Ltd | Other services | 2012 |
| Node Creative Ltd | Professional & scientific | 2024 |
| Noel Blakeman Limited | Professional & scientific | 2010 |
| Noel Soryn Digital Ltd | Information & communication | 2025 |
| Noghan Limited | Real estate | 2016 |
| Noir Bar Limited | Hospitality | 2026 |
| Noise Seal Limited | Manufacturing | 1997 |
| Noju Limited | Health & social care | 2015 |
| Noka Plumbing Limited | Construction | 2022 |
| Nolan (1) Limited | Wholesale & retail | 2011 |
| Nolan Throw Holdings Ltd | Real estate | 2022 |
| Nolan Throw Ltd | Real estate | 2004 |
| Nomadic Birdy Ltd | Administrative & support | 2026 |
| NON Functional Testing Ltd | Information & communication | 2017 |
| Nonaskitchen Limited | Hospitality | 2020 |
| Nona’S Ventures Limited | Real estate | 2024 |
| Nonixon Auto Ltd | Wholesale & retail | 2020 |
| Nonstop Driving School Limited | Education | 2025 |
| Noodlesta Limited | Hospitality | 2017 |
| Nook Investment Ltd | Real estate | 2018 |
| Nook&Nibbles Ltd | Hospitality | 2026 |
| Noonacare Limited | Health & social care | 2016 |
| Nooris Cars Ltd | Transport & logistics | 2025 |