| Myxology Ltd | Hospitality | 2018 |
| N. Booth Limited | Information & communication | 2017 |
| Nadochco Care Ltd | Health & social care | 2017 |
| Nadtech Limited | Professional & scientific | 2007 |
| Nathaninc Ltd | Transport & logistics | 2021 |
| National Leisure Services UK Ltd | Wholesale & retail | 2025 |
| National Utility Ltd | Construction | 2019 |
| Natom Services Ltd | Professional & scientific | 2024 |
| Nayagara Ltd | Wholesale & retail | 2025 |
| Nayagara Shop Limited | Wholesale & retail | 2026 |
| NB HV Ltd | Construction | 2026 |
| NB Maintenance Limited | Construction | 2014 |
| NB Solar Ltd | Construction | 2024 |
| NDW Properties Ltd | Construction | 2019 |
| Neil Everall Ltd | Construction | 2017 |
| Nella Joinery Limited | Construction | 2022 |
| Nest Family Ltd | Professional & scientific | 2025 |
| Nestora Ltd | Real estate | 2026 |
| Netmodules Ltd | Professional & scientific | 2026 |
| Netsla Ltd | Information & communication | 2013 |
| Neurohappy Ltd | Manufacturing | 2025 |
| New Jade City 12 Limited | Hospitality | 2017 |
| New Kirkstall Sushi Ltd | Hospitality | 2025 |
| New Life Butterfly Ltd | Other services | 2019 |
| Newburn Power Rental Limited | Manufacturing | 1988 |
| Nextgen Health Consulting Ltd | Extraterritorial | 2024 |
| Nhqs Services Ltd | Construction | 2018 |
| Nico (Consultants) Limited | Construction | 1985 |
| Nida Pizza Ltd | Hospitality | 2024 |
| Nightingale QS Services Ltd | Professional & scientific | 2022 |
| Nightingales Wrought Iron Limited | Construction | 2014 |
| Nikitha Peddabai Limited | Information & communication | 2021 |
| Nikle Construction Limited | Construction | 2009 |
| Nimertech Ltd | Construction | 2021 |
| Nina Canine Kennels Ltd | Professional & scientific | 2024 |
| NJP Property Investment Ltd | Real estate | 2025 |
| NJS Firedoors Ltd | Manufacturing | 2026 |
| Nljb Properties Limited | Real estate | 2023 |
| NM Plant and Scaffolding Ltd | Construction | 2023 |
| NO.1 Cuts Ltd | Other services | 2025 |
| NO.13 Barber Shop Ltd | Other services | 2019 |
| NO1 British Textiles Recycling Ltd | Wholesale & retail | 2019 |
| Node Fire & Security Limited | Administrative & support | 2022 |
| Noisy Red Cinema Ltd | Administrative & support | 2021 |
| Nollpip Associates Ltd | Administrative & support | 2017 |
| Nora's Pantry Ltd | Wholesale & retail | 2023 |
| Normanton Construction Technology Limited | Construction | 2009 |
| Norman`S Motor Shop Limited | Wholesale & retail | 2003 |
| North Star Fitness and Wellbeing Limited | Arts & recreation | 2010 |
| Northern Axis Ltd | Construction | 2026 |
| Northern Brothers Property Development Ltd | Real estate | 2024 |
| Northern Delta Group Ltd | Professional & scientific | 2026 |
| Northern Electrical Company Group Ltd. | Construction | 2011 |
| Northern Events Group Limited | Financial services | 2019 |
| Northern HA Ltd | Wholesale & retail | 2024 |
| Northern Home Counties Deveolopments Limited | Real estate | 2000 |
| Northern Home Improvement Ltd | Manufacturing | 2022 |
| Northern QA Limited | Professional & scientific | 2018 |
| Northgate Web Limited | Other services | 2014 |
| Northpoint Compliance Ltd | Professional & scientific | 2026 |
| Northwave Ltd | Professional & scientific | 2022 |
| Northwing Construction Limited | Construction | 2011 |
| Northwood Building & Maintenance Limited | Administrative & support | 2005 |
| Nostel Lane SPV Ltd | Real estate | 2026 |
| NOT THC Limited | Wholesale & retail | 2020 |
| Nova 2016 Limited | Administrative & support | 2016 |
| NSN Couriers Ltd | Financial services | 2020 |
| NU YOU Ltd | Arts & recreation | 2023 |
| Nupico Ltd | Wholesale & retail | 2022 |
| Nutum Global Services Limited | Transport & logistics | 2021 |
| Nvisage Graphics Limited | Professional & scientific | 2023 |
| Oak Forest School & Wilderness Skills CIC | Education | 2015 |
| Oakes J Ltd | Wholesale & retail | 2022 |
| Oakes Property Group Ltd | Real estate | 2026 |
| Oakfield Property Investments Limited | Financial services | 2016 |
| Oakfield Roofing (Yorkshire) Ltd | Construction | 2022 |
| Oakmill Limited | Financial services | 2016 |
| Oakwell Property Solutions Ltd | Real estate | 2018 |
| Oakwood 1965 Limited | Extraterritorial | 2014 |
| Oakwood Partnering Ltd | Professional & scientific | 2026 |
| Oakworth Altrincham Limited | Administrative & support | 2014 |
| Oakworth Holdings Limited | Financial services | 2016 |
| Oasis Bars (Yorkshire) Limited | Hospitality | 2001 |
| OBI & Bimpe Ltd | Construction | 2021 |
| Ocean Steppp Ltd | Wholesale & retail | 2025 |
| Ocular Studio Ltd | Professional & scientific | 2024 |
| Odbox Civil Engineers Limited | Construction | 2017 |
| OGS Property Management Limited | Households | 2025 |
| OH My Stays Ltd | Real estate | 2023 |
| Oiltek Limited | Manufacturing | 2005 |
| OJW Estate Management Limited | Real estate | 2025 |
| Olive Clean Ltd | Administrative & support | 2022 |
| Olive Service Facilities Ltd | Administrative & support | 2024 |
| Olxeashop Ltd | Manufacturing | 2025 |
| Oman Medical Ltd | Health & social care | 2026 |
| Omer Ltd | Other services | 2018 |
| Omniatek Ltd | Information & communication | 2023 |
| Omnisoft Limited | Information & communication | 2025 |
| ON the Ball Espana Ltd | Arts & recreation | 2022 |
| ON the Mirf Ltd | Hospitality | 2025 |