| Newton Electrical Installations Ltd | Construction | 2018 |
| Newton Precision Engineering Limited | Manufacturing | 2009 |
| Nexgen (Garibaldi) Limited | Real estate | 2024 |
| Nexgen Capital Investments Ltd | Administrative & support | 2017 |
| Nexgen Funding Limited | Financial services | 2020 |
| Nexgen Heating and Plumbing Specialists Ltd | Construction | 2021 |
| Next Generation Blinds Ltd | Construction | 2021 |
| Nextyou Ltd | Health & social care | 2025 |
| Nexus Fire and Security Ltd | Administrative & support | 2012 |
| Nexus Fire Consultants Ltd | Professional & scientific | 2020 |
| NFA Beauty Limited | Other services | 2023 |
| NG Audiology Limited | Health & social care | 2022 |
| NGK Marketing Limited | Professional & scientific | 2025 |
| NI Construction & Groundworks Ltd | Construction | 2025 |
| Niche Style Limited | Wholesale & retail | 2021 |
| Nichols Accountancy Ltd | Professional & scientific | 2016 |
| Nick Aldridge Roofing Ltd | Construction | 2013 |
| Nick Hart Consulting Ltd | Professional & scientific | 2019 |
| Nick of Time Limited | Transport & logistics | 2025 |
| Nicola Wood Projects Limited | Professional & scientific | 2012 |
| Nicolajanecreates Limited | Wholesale & retail | 2022 |
| Nidra Care Limited | Health & social care | 2023 |
| Night Nerds Limited | Other services | 2019 |
| Nightingale Court Care Group Limited | Financial services | 2021 |
| Nightingale Court Care Limited | Health & social care | 2021 |
| Nightsoft Ltd | Information & communication | 2024 |
| NIK Woods Tree Services Limited | Agriculture & fishing | 2012 |
| Nike Noire Fragrance Ltd | Wholesale & retail | 2026 |
| Nikki Wheeler Consultancy Limited | Professional & scientific | 2013 |
| Nina Estates LLP | | 2009 |
| Nine Athletics Limited | Education | 2025 |
| Nineties Nostalgia Artwork Ltd | Arts & recreation | 2023 |
| Nitespharma UK Limited | Health & social care | 2011 |
| Nizana Limited | Wholesale & retail | 2023 |
| NJA Partners Ltd | Administrative & support | 2022 |
| NK Steel Doors Ltd | Professional & scientific | 2024 |
| Nkane Consultants Ltd | Professional & scientific | 2023 |
| NKG Construction Ltd | Construction | 2024 |
| NLC Electrical Ltd | Construction | 2024 |
| NLH Property Services Limited | Construction | 2017 |
| NLM Marketing Ltd | Professional & scientific | 2022 |
| NLS Engineering Limited | Construction | 2013 |
| NMJ Associates Limited | Information & communication | 1996 |
| NO 5 Southern Limited | Other services | 2013 |
| Noah's Place Support CIC | Health & social care | 2024 |
| Noller Limited | Professional & scientific | 2025 |
| Nomad Group Investments Ltd | Manufacturing | 2025 |
| Noodle Bar Waterlooville Ltd | Hospitality | 2024 |
| Nook Architecture Limited | Professional & scientific | 2023 |
| Noor Solutions Limited | Education | 2024 |
| Nordic Legal Services Limited | Public administration | 2014 |
| Norel Productions Ltd | Information & communication | 2017 |
| Norfolk Roofing Limited | Construction | 2025 |
| Nork Sports Group Ltd | Arts & recreation | 2023 |
| North END Property Maintenance Company Limited | Real estate | 2015 |
| North END Vape Limited | Wholesale & retail | 2025 |
| North Harbour Carpentry & Joinery Limited | Construction | 2003 |
| North-West AM2 Centres Limited | Education | 2019 |
| Northbase Group Ltd | Professional & scientific | 2019 |
| Northfield Commercial Services Ltd | Professional & scientific | 2024 |
| Northney Decorators Ltd | Construction | 2013 |
| Northney Yacht Repair Ltd | Manufacturing | 2014 |
| Northway Vehicle Maintenance Ltd | Wholesale & retail | 2019 |
| NOT Long NOW Ltd | Professional & scientific | 2023 |
| Nottingham Apartment Ltd | Real estate | 2023 |
| Novae Clinic Ltd | Health & social care | 2023 |
| Novamantis Ltd | Information & communication | 2023 |
| NOW Recovery Ltd | Transport & logistics | 2022 |
| NOX Sleep Limited | Manufacturing | 2025 |
| Nplc Limited | Administrative & support | 2009 |
| NR Ethos Limited | Real estate | 2025 |
| Nrpg (39-45 BS) Ltd | Real estate | 2014 |
| Nrpg (ES) Ltd | Real estate | 2015 |
| Nrpg (F & V) Ltd | Administrative & support | 2013 |
| Nrpg (LS) Ltd | Real estate | 2016 |
| Nrpg (South Parade) Ltd | Professional & scientific | 2012 |
| Nrpg Management Ltd | Financial services | 2012 |
| Nrpg Willowpath Ltd | Other services | 2015 |
| Nsimba Properties Limited | Real estate | 2021 |
| NSP Solutions Ltd | Agriculture & fishing | 2022 |
| Nstores Whatnot Ltd | Wholesale & retail | 2026 |
| Ntesports Ltd | Professional & scientific | 2021 |
| NTH Degree Engineering Limited | Professional & scientific | 2025 |
| Ntrust Consulting Ltd | Professional & scientific | 2024 |
| Nufresh Carpet Cleaning Services Limited | Administrative & support | 2023 |
| Nukleas Limited | Professional & scientific | 2018 |
| Number 1 Roofing Limited | Construction | 2026 |
| Number Nerds Limited | Professional & scientific | 2012 |
| Nuovi Limited | Professional & scientific | 2024 |
| Nurturing Hands Care Services Ltd | Administrative & support | 2024 |
| Nuts&Treats Limited | Hospitality | 2023 |
| Nuttura Foods Ltd | Manufacturing | 2026 |
| Nuvola Resourcing Limited | Administrative & support | 2016 |
| O a Wilbourne Limited | Professional & scientific | 2024 |
| O'Connor Builders (South) Ltd | Construction | 2004 |
| O'Hara Properties & Estates Limited | Real estate | 2021 |
| O'Hara Solicitors Limited | Professional & scientific | 2021 |
| O'Shea Properties Limited | Real estate | 2002 |
| O. L. B. Group Ltd | Transport & logistics | 2021 |
| OA Concepts Interior Design Ltd | Professional & scientific | 2022 |