| NINE-24 Limited | Professional & scientific | 2013 |
| Ninertate Limited | Hospitality | 2025 |
| Ninetyfree Ltd | Wholesale & retail | 2023 |
| Ninjadeer Limited | Professional & scientific | 2018 |
| Nipper International Limited | Arts & recreation | 2007 |
| Nirman 81 Limited | Real estate | 2021 |
| Niro Living Ltd | Real estate | 2020 |
| Nirvana Management 9 Limited | Real estate | 2007 |
| Nishum.Design Ltd | Wholesale & retail | 2025 |
| Nisiros Limited | Professional & scientific | 2006 |
| Nitesights Ltd | Wholesale & retail | 2024 |
| Nitra Fabrication Ltd | Manufacturing | 2025 |
| Nivalis Solutions Ltd | Information & communication | 2024 |
| Nivan Ltd | Information & communication | 2013 |
| Nivex Ventures Limited | Construction | 2005 |
| Nivida Ltd | Wholesale & retail | 2025 |
| Nixgar Property Services Limited | Professional & scientific | 2026 |
| Nixshelf Ltd | Wholesale & retail | 2025 |
| Nixya Limited | Wholesale & retail | 2025 |
| Njord Engineering Ltd | Manufacturing | 2018 |
| Njwestbourne Ltd | Hospitality | 2025 |
| NK Insight Fusion Ltd | Information & communication | 2024 |
| NK Streamline Transport Ltd | Transport & logistics | 2013 |
| Nkli Technologies Ltd | Information & communication | 2020 |
| NKR Interiors Limited | Construction | 2018 |
| NLC Group of Companies Limited | Professional & scientific | 1994 |
| NLG Global Limited | Manufacturing | 2020 |
| NLM Solutions Ltd | Education | 2024 |
| NMS Group Holdings Limited | Financial services | 2022 |
| NMS Infrastructure Limited | Construction | 2006 |
| NMS International Group Ltd | Public administration | 2007 |
| NMT Tax Limited | Professional & scientific | 2016 |
| Nnaco Proclean Services Ltd | Administrative & support | 2025 |
| NO 1 Drain Co. Ltd | Water & waste | 2024 |
| NO 1 Gulliver Company Limited | Real estate | 2008 |
| NO 7 Kingsbridge Flat Management Company Limited | Households | 2005 |
| NO Butts BIN Co. Limited | Administrative & support | 1994 |
| NO Final EU SOU O Winner Ltd | Professional & scientific | 2026 |
| NO Idea PUB Co Limited | Hospitality | 2026 |
| NO Limits Property Management Ltd | Real estate | 2018 |
| NO Limits Property Solutions Ltd | Real estate | 2018 |
| NO Loss Properties Limited | Real estate | 2019 |
| NO Smoking Products Limited | Administrative & support | 2006 |
| NO. 253 Belle VUE Road Management Limited | Households | 1976 |
| NO.1 Haulage Ltd | Transport & logistics | 2025 |
| NO1 PHD Limited | Extraterritorial | 2019 |
| NO1 PHD UK Limited | Construction | 2024 |
| NO4 Carpentry Ltd | Manufacturing | 2025 |
| Nobel Invest Ltd | Real estate | 2018 |
| Nobl Ride Ltd | Transport & logistics | 2026 |
| Noble Energy Ltd | Construction | 2022 |
| Noble Fade Ltd | Other services | 2026 |
| Nocturne Agents Ltd | Information & communication | 2025 |
| Nod’S Longfleet Freehold Limited | Households | 2025 |
| Noen Projects Ltd | Professional & scientific | 2021 |
| Noetic 4X4 Ltd | Professional & scientific | 2020 |
| Nofer UK Limited | Wholesale & retail | 2024 |
| Noga Shito Ltd | Manufacturing | 2025 |
| Noir Immersion Ltd | Professional & scientific | 2026 |
| Noire Prototypes Limited | Manufacturing | 2025 |
| Nojo Transport Solutions Ltd | Transport & logistics | 2020 |
| Nokchance Ltd | Other services | 2022 |
| Nomad Business Services Limited | Administrative & support | 2026 |
| Nomad Legal Administration Ltd | Construction | 2022 |
| Nomad Terra Limited | Wholesale & retail | 2021 |
| Nomadist Ltd. | Information & communication | 2018 |
| Noman Enterprise Ltd | Wholesale & retail | 2023 |
| Noman Sarwar Ltd | Wholesale & retail | 2024 |
| Nomeatdisco Ltd | Other services | 2024 |
| Nomstrong Ltd | Wholesale & retail | 2024 |
| Nongiba @Samtee Ltd | Manufacturing | 2025 |
| Nonnewtonian Ltd | Manufacturing | 2024 |
| Noob Mart Ltd | Wholesale & retail | 2025 |
| Noodle Management Ltd | Professional & scientific | 2026 |
| Noodlebar Eastbourne Ltd | Hospitality | 2025 |
| Noor Takeaway Bournemouth Ltd | Hospitality | 2021 |
| Nopas Security Ltd | Administrative & support | 2023 |
| Norakae Ltd | Wholesale & retail | 2021 |
| Norbro Properties Limited | Real estate | 2022 |
| Norcadia Consulting Ltd | Professional & scientific | 2026 |
| Norco Composites Ltd | Construction | 2015 |
| Norco G R P Limited | Construction | 1993 |
| Norco Holdings Ltd | Financial services | 2015 |
| Nordic Model NOW Limited | Professional & scientific | 2022 |
| Norfolk House Boscombe (Management) Limited | Households | 1989 |
| Nori Mori Ltd | Manufacturing | 2022 |
| Norlington Trading Limited | Construction | 2003 |
| Noro Marine Ltd | Manufacturing | 2019 |
| Norris & Sons (2011) Ltd | Wholesale & retail | 2011 |
| Norrsken Company Limited | Construction | 2011 |
| North Dorset Travel Ltd | Transport & logistics | 2000 |
| North Fossil Farm Ltd | Administrative & support | 2017 |
| North Fossil Ltd | Construction | 2020 |
| North Hampshire ENT LLP | | 2013 |
| North Harbour Ltd | Households | 2023 |
| North Lodge Limited | Real estate | 1980 |
| North Point Poole Limited | Households | 2021 |
| North Quay 1 Ltd | Construction | 2025 |
| North Road (Poole) Management Company Limited | Households | 2026 |
| North Sea Systems Enterprises Ltd | Information & communication | 2010 |