| Nicole Omotayo Photography Ltd | Professional & scientific | 2024 |
| Nicos Car Wash Ltd | Other services | 2020 |
| Nicuw Interiors Ltd | Construction | 2022 |
| Nideforme Ltd | Information & communication | 2026 |
| Nidzboutique Ltd | Other services | 2022 |
| Nigel Briant Limited | Manufacturing | 2017 |
| Nightingale Lifts Limited | Administrative & support | 1996 |
| Nightingale Media Limited | Other services | 2022 |
| Nihung Santhia Limited | Education | 2017 |
| Niibee Supplements Ltd | Wholesale & retail | 2026 |
| NIK Design 2013 Limited | Other services | 2015 |
| Nika Investments Ltd | Construction | 2019 |
| Nika Trades Ltd | Wholesale & retail | 2026 |
| Nikaraa Ltd | Wholesale & retail | 2025 |
| Nikee Healthcare Services Ltd | Health & social care | 2016 |
| Niki Ayers Limited | Administrative & support | 2009 |
| Nikita Zelinschii Ltd | Wholesale & retail | 2023 |
| Nikkygold Ltd | Health & social care | 2020 |
| Niko Cafe Ltd | Hospitality | 2025 |
| Niko Carpentry Ltd | Construction | 2026 |
| Niko-Cool Ltd | Construction | 2018 |
| Nikole Lashes & Beauty Ltd | Other services | 2026 |
| Nilex Group Ltd | Real estate | 2021 |
| Nilex Holdings Ltd | Financial services | 2023 |
| Nilo Construction Limited | Construction | 2017 |
| Nima (Wearenima) Ltd | Other services | 2023 |
| Nima (Wearenima) Services Ltd | Other services | 2023 |
| Nims Ltd | Real estate | 2023 |
| Ninan Associates Limited | Real estate | 2023 |
| Nine Blessings Limited | Wholesale & retail | 2007 |
| Nine Lionel Road Ltd | Households | 2020 |
| Nine to Five Packaging Limited | Administrative & support | 2013 |
| NINETEEN85 Limited | Wholesale & retail | 2017 |
| Ninja Cards Ltd | Wholesale & retail | 2022 |
| Nino's Italian Limited | Hospitality | 2022 |
| Niompay Limited | Administrative & support | 2024 |
| Niquemaque Services Limited | Transport & logistics | 2016 |
| Nirbaan UK Ltd | Wholesale & retail | 2017 |
| Nirpaus Ltd | Wholesale & retail | 2024 |
| Niru and Mathumai Property Ltd | Real estate | 2025 |
| Nirvik Trading Limited | Wholesale & retail | 2024 |
| Nisa Consultants Limited | Administrative & support | 2013 |
| Nish Estates Limited | Real estate | 2020 |
| Nissi Mark Properties Ltd | Households | 2025 |
| Nixon Animation Ltd | Information & communication | 2024 |
| Nizamstore Ltd | Wholesale & retail | 2025 |
| Njide Limited | Information & communication | 2023 |
| Njnodes Ltd | Information & communication | 2026 |
| NJR Electrical and Fire Ltd | Construction | 2022 |
| NJS Management Ltd | Professional & scientific | 2017 |
| Njuki Limited | Health & social care | 2014 |
| NK Exquisite Events Ltd | Hospitality | 2020 |
| NKC Ground Work (Nigam Kumar Construction) Ltd | Construction | 2025 |
| NKO Enterprises Limited | Real estate | 2017 |
| NM Construction Services Limited | Construction | 2016 |
| NM Hospitality Consultancy Limited | Professional & scientific | 2021 |
| NM Projects Limited | Information & communication | 1976 |
| NMR Elite Ltd | Administrative & support | 2023 |
| Nmsuk Ltd | Health & social care | 2023 |
| NN International Limited | Other services | 2015 |
| NNE & NIC Ltd | Health & social care | 2026 |
| NNG Solutions Limited | Manufacturing | 2026 |
| Nntt Ltd | Hospitality | 2026 |
| NO Filter Management Ltd | Professional & scientific | 2022 |
| NO KID Left Behind CIC | Education | 2024 |
| NO More Parties Ltd | Information & communication | 2023 |
| NO More Water Leaks Ltd | Professional & scientific | 2018 |
| NO.1 Locations Ltd | Real estate | 2007 |
| Noah James Developments Ltd | Construction | 2017 |
| Noah James Group Ltd | Financial services | 2017 |
| Noah James Properties Ltd | Real estate | 2014 |
| Noah's Shelter Ltd | Real estate | 2022 |
| Noakes Capital Partners Limited | Financial services | 2026 |
| Noakes Holdco Limited | Financial services | 2025 |
| Noakes Specialty Risk Solutions Limited | Financial services | 2025 |
| Nobelis Academy Ltd | Education | 2026 |
| Noble Decor Limited | Construction | 2022 |
| Noblecut Cutlery Ltd | Wholesale & retail | 2026 |
| Nobleman Projects Limited | Manufacturing | 2020 |
| Noblepath Solutions Ltd | Information & communication | 2026 |
| NOC Advisory Group Ltd | Professional & scientific | 2025 |
| Noce Ltd | Wholesale & retail | 2026 |
| Nocion Consulting Ltd | Information & communication | 2021 |
| Nojus Build Ltd | Construction | 2026 |
| Nokes Custom Build Limited | Construction | 2016 |
| Nomads Holding Ltd | Financial services | 2025 |
| Nomera Hills Ltd | Real estate | 2025 |
| Nonny Investment Ltd | Real estate | 2023 |
| Noonan Builders Limited | Construction | 2021 |
| Noontime Games Ltd | Wholesale & retail | 2020 |
| Noor Advisers Ltd | Health & social care | 2026 |
| Noor Al-Absar Ltd | Transport & logistics | 2023 |
| Noor Asif Estates Ltd | Real estate | 2022 |
| Noor Group Limited | Wholesale & retail | 2018 |
| Nooz Living Ltd | Real estate | 2021 |
| Norah Trade Ltd | Wholesale & retail | 2019 |
| Norbert Consulting Ltd | Professional & scientific | 2020 |
| Norcare Ltd | Health & social care | 2018 |
| Nordachi Limited | Wholesale & retail | 2023 |
| Nordasset Ltd | Wholesale & retail | 2025 |