| Ninja Cleaners Ltd | Construction | 2022 |
| Nirel Green Consulting Ltd | Professional & scientific | 2026 |
| Nivstroy Limited | Construction | 2018 |
| NJ Food Street Ltd | Hospitality | 2019 |
| NJM Property (South) Ltd | Households | 2020 |
| Njordic RDC Ltd | Professional & scientific | 2026 |
| NJP Heating Services Limited | Construction | 2015 |
| NJR Ltd | Transport & logistics | 2025 |
| NJW Open Plan Construction Group Ltd | Construction | 2018 |
| NK Faulkner and Sons Limited | Information & communication | 2019 |
| NKS Software Ltd | Information & communication | 2016 |
| NMA Transport Ltd | Transport & logistics | 2022 |
| NMK Capital Limited | Real estate | 2019 |
| Nmlb Limited | Information & communication | 2017 |
| NMT Properties Ltd | Real estate | 2026 |
| NNM Enterprises Ltd | Construction | 2020 |
| NO BE Play Ltd | Information & communication | 2020 |
| NO One to Talk Ltd | Information & communication | 2024 |
| NO One to Talk to Ltd | Information & communication | 2024 |
| No-R Solutions Ltd | Information & communication | 2017 |
| Noble Arrows Ltd | Health & social care | 2017 |
| Noble Stowell Holdings Limited | Professional & scientific | 2019 |
| Noble Stowell Property Limited | Real estate | 2022 |
| Noble Street Properties Ltd | Hospitality | 2025 |
| Nock Limited | Professional & scientific | 2024 |
| Nocturne Resources Ltd | Administrative & support | 2016 |
| Noecis Limited | Information & communication | 2019 |
| Noima Consultancy Limited | Professional & scientific | 2016 |
| Noima Level UP Limited | Wholesale & retail | 2019 |
| Nolex-Uk Ltd | Transport & logistics | 2025 |
| Nomaad Ltd | Wholesale & retail | 2022 |
| Nomad Operations Ltd | Professional & scientific | 2025 |
| Nomios Uk&I Group Limited | Financial services | 2015 |
| Nomios Uk&I Holding Limited | Financial services | 2024 |
| Nomios Uk&I Limited | Information & communication | 2006 |
| Norbkate Transport Ltd | Transport & logistics | 2016 |
| Nord Spedition Ltd | Transport & logistics | 2022 |
| Norrel Limited | Information & communication | 2013 |
| North 50 Limited | Information & communication | 2025 |
| North Hampshire Clinic Ltd | Health & social care | 2019 |
| North Hampshire Education Alliance | Education | 2017 |
| North Hampshire Inns Ltd | Hospitality | 2014 |
| North Hampshire Lawn Treatments Ltd | Administrative & support | 2017 |
| North Hants Breastfeeding Counsellors CIC | Health & social care | 2020 |
| North Hants Property Services Ltd | Administrative & support | 2025 |
| North Hill Cottages Limited | Real estate | 2021 |
| Northpop Holding Limited | Real estate | 2025 |
| Northwood Basingstoke Ltd | Real estate | 2005 |
| Nortier Limited | Manufacturing | 2021 |
| Note Communications Ltd | Professional & scientific | 2024 |
| NOTIN2SMALL Logistics Limited | Transport & logistics | 2025 |
| Notorious Lift Europe Ltd | Wholesale & retail | 2021 |
| Nour Care Services Ltd | Administrative & support | 2023 |
| Nouveau Solutions Limited | Information & communication | 1992 |
| Nova Ascend Ltd | Wholesale & retail | 2025 |
| Nova E-Commerce Limited | Wholesale & retail | 2024 |
| Nova Mundo Limited | Wholesale & retail | 2010 |
| NR Builders & Sons Limited | Construction | 2023 |
| NRG Parts Ltd | Wholesale & retail | 2006 |
| NS Garment Services Limited | Manufacturing | 2013 |
| NSD Harrogate Limited | Professional & scientific | 2008 |
| NSP (UK) Limited | Professional & scientific | 2004 |
| NSS Plumbing Ltd | Construction | 2019 |
| NSW Building Solutions Limited | Construction | 2019 |
| Nton Estates Ltd | Real estate | 2025 |
| Ntsg Food Group Limited | Manufacturing | 2018 |
| NU Martial Arts Limited | Wholesale & retail | 2023 |
| NU Risk Ltd | Information & communication | 2024 |
| Nubhan Ltd | Wholesale & retail | 2015 |
| Nucgnex Lifesciences Limited | Manufacturing | 2018 |
| Number 8 Chinese Ltd | Hospitality | 2021 |
| Numi Scan (Basingstoke) Ltd | Health & social care | 2023 |
| Numillion Limited | Construction | 2021 |
| Nupura School of Arts Limited | Education | 2023 |
| Nurhas Barbers Ltd | Other services | 2024 |
| Nuway Support Services Limited | Administrative & support | 2015 |
| NYA Services and Repairs Ltd | Wholesale & retail | 2021 |
| Nytram-Tech Consultants Ltd | Information & communication | 2017 |
| O'Connor Transport Organisation Limited | Transport & logistics | 2023 |
| O2 Degree Limited | Professional & scientific | 2012 |
| OAI Private Ltd | Manufacturing | 2025 |
| Oak Leef Consultancy Ltd | Professional & scientific | 2018 |
| Oak Works Property Limited | Financial services | 2024 |
| Oak's Kitchen Ltd | Hospitality | 2026 |
| Oakdean Accountancy Ltd | Professional & scientific | 2024 |
| Oakdene Court Management Company Limited | Households | 2026 |
| Oakes Electrical Limited | Construction | 1998 |
| Oakleigh Dental Limited | Health & social care | 2008 |
| Oakley Acorns Limited | Education | 2006 |
| Oakley Carpentry Brothers Limited | Manufacturing | 2015 |
| Oakley Carpets Ltd | Wholesale & retail | 2023 |
| Oakley Mini Diggers Ltd | Administrative & support | 2012 |
| Oakley Motor Company Ltd | Wholesale & retail | 2026 |
| Oakley NPD Consulting Limited | Professional & scientific | 2019 |
| Oakley Services UK Limited | Administrative & support | 2007 |
| Oakley Stitchers CIC | Manufacturing | 2023 |
| Oakley TFM Ltd | Wholesale & retail | 1986 |
| Oakridge 521 Limited | Hospitality | 2025 |
| Oakridge Delight Limited | Hospitality | 2019 |
| Oakridge West Ltd | Hospitality | 2020 |