| Newman House Twenty First Century Management Company Limited | Households | 2009 |
| Newmans Metals Ltd | Water & waste | 2010 |
| Newmans Scaffolding UK Ltd | Construction | 2011 |
| Newmore Client Limited | Information & communication | 2014 |
| News Stop Westbromwich Ltd | Wholesale & retail | 2022 |
| Newsplus WB Limited | Wholesale & retail | 2015 |
| Nexorbit Ltd | Information & communication | 2026 |
| Nexstep Properties Ltd | Real estate | 2026 |
| Next Steps Supported Accommodation Ltd | Health & social care | 2025 |
| Nextgen Tuition WB Ltd | Education | 2024 |
| NFS1 Ltd | Wholesale & retail | 2025 |
| NGK Couriers Ltd | Transport & logistics | 2025 |
| NH Construction(Uk) Ltd | Construction | 2021 |
| Nibblez Ltd | Wholesale & retail | 2022 |
| Nic's Trade Ltd | Transport & logistics | 2017 |
| Niche Event Management Ltd | Professional & scientific | 2017 |
| Nicholls Steel Company Limited | Manufacturing | 2006 |
| Nicks Meats Ltd | Manufacturing | 2024 |
| Nico Sweets Ltd | Wholesale & retail | 2026 |
| Nicpon Limited | Transport & logistics | 2017 |
| Night Hawks Business Protection Limited | Administrative & support | 2017 |
| Nightingale Healthcare Limited | Real estate | 2004 |
| Nikis Cosmetics Ltd | Wholesale & retail | 2015 |
| Nimrod Asbury Trading Ltd | Wholesale & retail | 2012 |
| Ninetwofive Talent Ltd | Administrative & support | 2025 |
| Ninja Power Ltd | Arts & recreation | 2021 |
| Ninth Horizon Ltd | Wholesale & retail | 2023 |
| Nivek Ltd | Construction | 2025 |
| Niyamah Investment Limited | Real estate | 2025 |
| NK Properties WM Limited | Construction | 2015 |
| Nk&B Company Limited | Transport & logistics | 2018 |
| NKR Gates Ltd | Households | 2026 |
| NKS (Narn) Ltd | Real estate | 2020 |
| NO 1 Cars Ltd | Wholesale & retail | 2019 |
| NO 1 Property Consultants Ltd | Professional & scientific | 2024 |
| NO.1 Flooring Limited | Wholesale & retail | 2024 |
| NO1 Elec Limited | Construction | 2025 |
| NO1 Skip Hire Ltd | Water & waste | 2010 |
| Noble Build Construction Ltd | Construction | 2025 |
| Noir Property Solutions Ltd | Real estate | 2021 |
| Nomi Mobiles Limited | Wholesale & retail | 2023 |
| Noor Const Services Ltd | Construction | 2026 |
| Noor Desserts & Cakes Limited | Manufacturing | 2024 |
| Norseline Limited | Transport & logistics | 2024 |
| North Lincs Ltd. | Transport & logistics | 2018 |
| Northmead Trading Limited | Wholesale & retail | 2021 |
| Nova Components Limited | Manufacturing | 2026 |
| Novie Studios Ltd | Arts & recreation | 2026 |
| Novo CSV Limited | Other services | 2008 |
| Nowakowski Logistic Ltd | Transport & logistics | 2013 |
| NR Transport Ltd | Transport & logistics | 2016 |
| NRI Samaj Sewa Sanstha Ltd | Other services | 2025 |
| NRS Builders Limited | Construction | 2020 |
| NS Glass and Glazing Solution Ltd | Construction | 2024 |
| Nsonso Limited | Transport & logistics | 2019 |
| NSS Works Limited | Construction | 2025 |
| NT Narda Properties Ltd | Real estate | 2026 |
| Nuhalubi Limited | Health & social care | 2014 |
| Number 1 Flooring (B'Ham) Limited | Wholesale & retail | 2019 |
| Numly & Co. Limited | Professional & scientific | 2025 |
| Nuolaedo Gold Ltd | Wholesale & retail | 2026 |
| Nuovo Foods Limited | Wholesale & retail | 2011 |
| Nuovo Holdings Limited | Professional & scientific | 2026 |
| Nurscare Limited | Health & social care | 2022 |
| Nutridrinks Limited | Wholesale & retail | 2011 |
| NXP Limited | Transport & logistics | 2021 |
| Oak B70 Limited | Hospitality | 2021 |
| Oakham Sheet Metal Company Limited | Manufacturing | 1983 |
| Oakleys Doors Ltd | Manufacturing | 2017 |
| Oakmoore Accountants Limited | Professional & scientific | 2026 |
| Oakview Real Estates Ltd | Real estate | 2025 |
| Oakwell Branch Ltd | Administrative & support | 2026 |
| OBD Transport Ltd | Transport & logistics | 2018 |
| Obeni Ltd | Construction | 2025 |
| Obiter Legal Ltd | Professional & scientific | 2012 |
| Obsidian Management Limited | Information & communication | 2023 |
| Oceanic Construction Ltd | Construction | 2023 |
| Oconnia Limited | Manufacturing | 2014 |
| Odara Supported Housing Ltd | Hospitality | 2019 |
| Odara the Support Network C.I.C. | Other services | 2022 |
| Office TEK Technology Solutions Ltd | Information & communication | 2024 |
| OHS Business Ltd | Wholesale & retail | 2017 |
| OKO Invest Limited | Wholesale & retail | 2023 |
| Ola-Johnson Limited | Professional & scientific | 2019 |
| Old Bush Inn Ltd | Hospitality | 2019 |
| Old Park Minimarket Ltd | Wholesale & retail | 2017 |
| Oldbury Cars Sale Ltd | Other services | 2024 |
| Olive & Tree Ltd | Hospitality | 2015 |
| Olive Tree Select Ltd | Wholesale & retail | 2026 |
| Oluvox Ltd | Information & communication | 2026 |
| Omal Elliott Transport Ltd | Transport & logistics | 2014 |
| Omega 1927 Limited | Real estate | 2019 |
| Omega Properties (WB) Ltd | Households | 2011 |
| Omni Sweet Centre Ltd | Wholesale & retail | 2024 |
| Omnispark Solutions Ltd | Administrative & support | 2025 |
| One 1 Coffee(Jq) Ltd | Wholesale & retail | 2025 |
| One Professional Ltd | Transport & logistics | 2025 |
| One Stop Plumbing & Heating Ltd | Construction | 2021 |
| Onkar Investment Properties Ltd | Real estate | 2023 |
| Onwayy Delivery Ltd | Information & communication | 2026 |