| Nineteen 76 Limited | Construction | 2021 |
| NINETY9 Productions Limited | Information & communication | 2022 |
| Ninevel Ltd | Wholesale & retail | 2026 |
| Ningbo Changhong Import Export Co., Limited | Administrative & support | 2020 |
| Ningbo Deka Electrical Appliance Co., Ltd. | Extraterritorial | 2018 |
| Ningbo Geyummy Import & Export Co., Ltd. | Extraterritorial | 2020 |
| Ningbo Greenshare Import & Export Co., Ltd | Extraterritorial | 2021 |
| Ningbo Honde Medical Instruments Co., Ltd | Extraterritorial | 2019 |
| Ningbo Ideamake Industrial Co., Ltd | Extraterritorial | 2017 |
| Ningbo Jingya Supply Chain Management Co., Ltd | Extraterritorial | 2018 |
| Ningbo R-Lite Co., Ltd | Extraterritorial | 2018 |
| Ningbo Raymace Industrial Co., Ltd | Extraterritorial | 2019 |
| Ningbo Starlight IMP. & EXP. Co., Ltd. | Extraterritorial | 2021 |
| Ningbo Wangsheng Machinery Co., Ltd | Professional & scientific | 2009 |
| Ningbo Weixiang Plastic Co., Limited | Extraterritorial | 2018 |
| Ningbo Yinzhou Bosun Paper Products Co., Ltd | Extraterritorial | 2020 |
| Ningbo Yonshine Industrial Co., Limited | Extraterritorial | 2020 |
| Ningbo Zith Industry Co., Ltd. | Extraterritorial | 2016 |
| Ninghang Stainless Steel Export Import Co Ltd | Administrative & support | 2021 |
| Ningheto Investments Ltd | Wholesale & retail | 2020 |
| Ningtex Fashion Co., Ltd | Wholesale & retail | 2015 |
| Ninian Consultancy Limited | Real estate | 2020 |
| Ninian Limited | Real estate | 2020 |
| Ninian Management Company Limited | Real estate | 2001 |
| Ninian Park Management Company (Cardiff) Limited | Households | 2008 |
| Ninian Park Properties Ltd | Real estate | 2016 |
| Nininac Consultancy Limited | Professional & scientific | 2012 |
| Ninja Dragons Martial Arts Ltd | Arts & recreation | 2015 |
| Ninjaboom Ltd | Information & communication | 2012 |
| Ninjagym UK Ltd | Arts & recreation | 2026 |
| Ninkaplast (U.K.) Limited | Manufacturing | 1988 |
| Ninomed Limited | Health & social care | 2019 |
| Nins Metal Trading (UK) Limited | Manufacturing | 2008 |
| Ninth Dimension Breathwork Ltd. | Health & social care | 2024 |
| Ninxx Co Ltd | Professional & scientific | 2023 |
| NIO Nico Co ., Ltd | Information & communication | 2021 |
| Niomon Limited | Information & communication | 2021 |
| Nipolat Ltd | Wholesale & retail | 2025 |
| Niqisha Enterprises Ltd | Transport & logistics | 2014 |
| Nirvair Construction Limited | Construction | 2019 |
| Nirvana Hair & Makeup Limited | Other services | 2024 |
| Nirvana Investors Ltd | Real estate | 2018 |
| Nirvana Systems Development Ltd | Information & communication | 2004 |
| Nisak Ecommerce Ltd | Wholesale & retail | 2026 |
| Nisean Maan Limited | Hospitality | 2026 |
| Nisien.Ai Limited | Information & communication | 2023 |
| Nistar Mart Ltd | Wholesale & retail | 2026 |
| NIT Facility Services Ltd | Administrative & support | 2015 |
| NIT Waste Management Ltd | Water & waste | 2018 |
| Nitro Business Ltd | Professional & scientific | 2024 |
| Nitro MAX Gold Europa Ltd | Information & communication | 2020 |
| Nitro Monk Ltd | Wholesale & retail | 2025 |
| Nitrobox Privacy Ltd | Information & communication | 2017 |
| Nitrova Ltd | Wholesale & retail | 2024 |
| Nitsl Mart Ltd | Wholesale & retail | 2025 |
| NIU Aesthetics Limited | Health & social care | 2022 |
| Niucheng Trade Ltd | Wholesale & retail | 2024 |
| Nivan Group Ltd | Professional & scientific | 2023 |
| Nivedita & Associates Limited | Health & social care | 2014 |
| Nivlora Ltd | Education | 2026 |
| Nivra Homes Limited | Real estate | 2021 |
| Niwaz 888 Properties Ltd | Real estate | 2024 |
| Niwcymru Limited | Energy | 2026 |
| Nixnef Global Ltd | Wholesale & retail | 2025 |
| Nixon Wright Partners Limited | Administrative & support | 2019 |
| Nixora Global Solution Ltd | Information & communication | 2026 |
| Nixora Ltd | Wholesale & retail | 2026 |
| Niyam Group UK Limited | Financial services | 2025 |
| Niydnik Ltd | Wholesale & retail | 2025 |
| NIZ Group UK Ltd | Manufacturing | 2026 |
| Nizip Commerce Ltd | Wholesale & retail | 2022 |
| Nizzam Ltd | Wholesale & retail | 2026 |
| NJ Hughes Construction Limited | Construction | 2018 |
| NJ Murphy Consultancy Ltd | Professional & scientific | 2025 |
| NJ Trading Cardiff Limited | Real estate | 2022 |
| NJA Group Ltd | Real estate | 2025 |
| NJC Electrical Ltd | Manufacturing | 2018 |
| Njcopr Ltd | Wholesale & retail | 2020 |
| NJF Services Ltd | Real estate | 2019 |
| NJG Bell Limited | Transport & logistics | 2015 |
| Njle LLP | | 2023 |
| Njlm Limited | Professional & scientific | 2023 |
| NJN Private Limited | Hospitality | 2025 |
| NJP Consulting Engineers Limited | Construction | 2015 |
| NJS Probation Services Limited | Health & social care | 2014 |
| Njszqdqad Limited | Information & communication | 2021 |
| NK Brand Ltd | Wholesale & retail | 2025 |
| NK Education Ltd | Information & communication | 2025 |
| NK Matrix Ltd | Information & communication | 2025 |
| NK Mobile 116 Limited | Wholesale & retail | 2026 |
| NK Prime Advisory Ltd | Professional & scientific | 2026 |
| NK Print Ltd. | Wholesale & retail | 2016 |
| NK442 Ltd | Hospitality | 2025 |
| Nkandu Limited | Wholesale & retail | 2025 |
| Nkchakshu UK Ltd | Wholesale & retail | 2022 |
| Nkdatagenix Ltd | Information & communication | 2026 |
| NKK Properties Cardiff Ltd | Real estate | 2026 |
| NKP Developments Ltd | Real estate | 2025 |
| NL Mode Ltd | Wholesale & retail | 2026 |
| NL Welch Property Limited | Real estate | 2026 |