| NEX Logistics Services Ltd | Transport & logistics | 2020 |
| Nexgen Accountancy Limited | Professional & scientific | 2021 |
| Next GEN Composite Limited | Construction | 2025 |
| Next GEN Developments WM Ltd | Construction | 2024 |
| Next GEN Events Ltd | Arts & recreation | 2025 |
| Next GEN Interiors Ltd | Construction | 2019 |
| Nextgen Students Ltd | Education | 2026 |
| Nextgen Training and Consultancy Services Ltd | Professional & scientific | 2024 |
| Nextphase Development Limited | Construction | 2011 |
| Ngaa Limited | Health & social care | 2023 |
| Ngage Industry Marketing Limited | Professional & scientific | 2018 |
| Ngezi Company Limited | Professional & scientific | 2022 |
| Niall Lamb Holdings Ltd | Financial services | 2025 |
| Nicholas Bullock and Associates Ltd | Transport & logistics | 2002 |
| Nicholls Portfolio Ltd | Real estate | 2024 |
| Nick FIX DRY Lining Limited | Construction | 2023 |
| Nick's Home Improvements Ltd | Construction | 2024 |
| Nigel Jones Ltd | Administrative & support | 2025 |
| Nirvana Court Management Company Limited | Professional & scientific | 2020 |
| Nisa (Cannock) Limited | Wholesale & retail | 2008 |
| Nisshin Denshi Limited | Extraterritorial | 1987 |
| NJ Auto Services Ltd | Wholesale & retail | 2025 |
| NJ Build Ltd | Construction | 2016 |
| NJT Assets Ltd | Financial services | 2025 |
| NJT Blinds Ltd | Wholesale & retail | 2022 |
| NMF Engineering Limited | Professional & scientific | 2023 |
| NO Mess Cleaning Limited | Administrative & support | 2014 |
| NO-1 Turkish Hair Cut(Cannock) Ltd | Other services | 2022 |
| Noble Lofts Limited | Construction | 2020 |
| Nock Padel Ltd | Arts & recreation | 2025 |
| Noggin Hair Limited | Other services | 2015 |
| Nolan Property Ltd | Construction | 2020 |
| NON Stop Kids Entertainment Ltd | Arts & recreation | 2013 |
| North Downs Music Studio Limited | Education | 2011 |
| North Walsall Limited | Wholesale & retail | 2002 |
| Northern Forklift (Scotland) Limited | Manufacturing | 2000 |
| Northern Refrigeration Wholesale (F.M.) Limited | Extraterritorial | 1999 |
| Northern Refrigeration Wholesale Limited | Extraterritorial | 1996 |
| Norton Canes Local Ltd | Wholesale & retail | 2024 |
| Norton Canes Practice Limited | Professional & scientific | 2023 |
| Norton Clean Getaway Limited | Administrative & support | 2025 |
| Norton Erection Limited | Construction | 1971 |
| Norton Home Improvements Ltd | Construction | 2025 |
| Norton Mechanical Services Ltd | Manufacturing | 2024 |
| Norton Property Leasing Ltd | Real estate | 2024 |
| Norton Square Deals Limited | Wholesale & retail | 2016 |
| Norton Supply Limited | Manufacturing | 2021 |
| Norton Vehicle Hire Ltd | Administrative & support | 2025 |
| Nosadean Logistics Ltd | Transport & logistics | 2016 |
| Nottingham House Maintenance Ltd | Construction | 2025 |
| Nouralion & Co Limited | Hospitality | 2025 |
| Nova Care Home Solutions Limited | Administrative & support | 2025 |
| Nova Retrofit Solutions Limited | Professional & scientific | 2025 |
| Nova Solar Renewables Limited | Construction | 2024 |
| Nova UK Holdings Limited | Financial services | 2025 |
| Novalink Ltd | Information & communication | 2024 |
| Novos Life Ltd | Health & social care | 2026 |
| NRT Property Consultants Limited | Professional & scientific | 2014 |
| NS Automation Limited | Professional & scientific | 2011 |
| NU Topia Lettings Limited | Hospitality | 2026 |
| NU Topia Services Limited | Professional & scientific | 2016 |
| Nutrein Energy Limited | Manufacturing | 2025 |
| Nuts and Bolts (Cannock) Limited | Wholesale & retail | 1989 |
| NWN Cannock Limited | Real estate | 2015 |
| NWP Services Ltd | Construction | 2026 |
| O'Brien's Property Investments Limited | Real estate | 2019 |
| OAC Asset Holdings Ltd | Financial services | 2026 |
| OAC Property Capital Ltd | Real estate | 2026 |
| Oak Farm Hotel LLP | | 2016 |
| Oakbridge Little Learners Ltd | Health & social care | 2024 |
| Oaklands Accountants Ltd | Professional & scientific | 2016 |
| Oakmoor Recruitment Limited | Administrative & support | 2015 |
| Oaksey Trading Ltd | Financial services | 2021 |
| Oakwoods Accountancy Limited | Professional & scientific | 2001 |
| Oatcake Development Ltd | Information & communication | 2025 |
| OBI Home Improvements Limited | Construction | 2012 |
| Obrien Capital Holdings Ltd | Financial services | 2026 |
| Obrien Capital Properties Ltd | Real estate | 2026 |
| Occupational Wellness Services Limited | Health & social care | 2025 |
| Octagon Eight Ltd | Administrative & support | 2020 |
| Octaport Limited | Wholesale & retail | 2008 |
| ODA Plastering Ltd | Construction | 2026 |
| ODH Marketing Limited | Wholesale & retail | 2017 |
| Odour Services International Ltd | Professional & scientific | 2010 |
| OE Trading Limited | Wholesale & retail | 2026 |
| OH HAI World Limited | Wholesale & retail | 2018 |
| Ohai Ltd | Education | 2025 |
| OHM Electrical Installations Limited | Construction | 2016 |
| OHM Investments Limited | Real estate | 2021 |
| OIL Genie Ltd | Extraterritorial | 2012 |
| Old HOB Hill Schoolyard Management Company Ltd | Households | 2011 |
| Old Penkridge Mews Flats Residents' Association Limited | Households | 1995 |
| Old Penkridge Mews Residents Association Limited | Households | 1994 |
| Old Penkridge Mews Residents' Association (1995) Limited | Households | 1995 |
| Old Road House Ltd | Real estate | 2024 |
| Olde Worlde Oak Joinery Limited | Construction | 2000 |
| Oldfield Park Limited | Real estate | 1997 |
| Oliveira Holdings Ltd | Real estate | 2015 |
| Ollsten Limited | Construction | 2018 |
| Omega Grouping Limited | Financial services | 2026 |