| N&P Crowther Limited | Real estate | 2019 |
| N.J.Products Ltd | Manufacturing | 2008 |
| NA Wholesale Ltd | Wholesale & retail | 2023 |
| Nabp Ltd | Hospitality | 2024 |
| Nada Home UK Ltd | Wholesale & retail | 2023 |
| Nancy LYN Arif Ltd | Wholesale & retail | 2024 |
| NAR Services Ltd | Real estate | 2023 |
| Nara Crepes Ltd | Hospitality | 2024 |
| Nashkaruka Ltd | Wholesale & retail | 2023 |
| Nashkaruka Properties Ltd | Wholesale & retail | 2025 |
| Nathan Hadfield Utilities Ltd | Construction | 2021 |
| Nattnatt Enterprises Limited | Information & communication | 2025 |
| Natures Cupboard Ltd | Public administration | 2022 |
| Naveeds Pizza & Balti Ltd | Hospitality | 2023 |
| Naya Modesty Ltd | Manufacturing | 2023 |
| Naykh Properties Limited | Real estate | 2022 |
| Naylor Westbourne Limited | Real estate | 2024 |
| Naystech Limited | Information & communication | 2024 |
| NB Manor Limited | Administrative & support | 2022 |
| NBH Properties Limited | Professional & scientific | 2004 |
| NC Consultants Ltd | Financial services | 2020 |
| Nelsons (Birstall) Limited | Manufacturing | 1947 |
| Neuro Tips Ltd | Education | 2011 |
| Neuromedics Ltd | Health & social care | 2024 |
| Nevon Ltd | Wholesale & retail | 2026 |
| New County Road Surfacing Limited | Construction | 1980 |
| New Level Media House Limited | Transport & logistics | 2022 |
| New Level Mind Body Soul Ltd | Manufacturing | 2025 |
| New Royel Craftsman Limited | Manufacturing | 2019 |
| New Street Motors Ltd | Wholesale & retail | 2026 |
| New Wave Detergents Limited | Manufacturing | 2019 |
| Newco (Global) Limited | Manufacturing | 2013 |
| Newdex Services Ltd | Information & communication | 2020 |
| Newway Office Furniture Ltd | Wholesale & retail | 2012 |
| Nexbytex Ltd | Wholesale & retail | 2026 |
| Nexter Ltd | Professional & scientific | 2023 |
| Nexus Mattresses Ltd | Wholesale & retail | 2025 |
| Niche Legal Services Limited | Professional & scientific | 2008 |
| Nick Farnsworth Ltd | Wholesale & retail | 2026 |
| Nicklin Estates Ltd | Real estate | 2024 |
| Night Star Consultants Limited | Information & communication | 2017 |
| Nightingale Mattress Company Ltd | Manufacturing | 2023 |
| Nimah Online Ltd | Wholesale & retail | 2023 |
| NL Commercials (Leeds) Limited | Administrative & support | 2015 |
| NL Commercials (ST Helens) Limited | Administrative & support | 2015 |
| NL Commercials (Wakefield) Limited | Administrative & support | 2015 |
| NL Commercials Darlington Limited | Administrative & support | 2016 |
| NL Commercials Holdings Limited | Administrative & support | 2015 |
| NL Commercials Management Ltd | Administrative & support | 2016 |
| NO Limits 1 Ltd | Health & social care | 2022 |
| Noble Elevation (UK) Ltd | Professional & scientific | 2026 |
| Noetica Press Limited | Information & communication | 2026 |
| Noman Care Services Limited | Health & social care | 2024 |
| Noor Travel and Tours Limited | Administrative & support | 2014 |
| Noorbridge Enterprises Limited | Manufacturing | 2026 |
| Noore Abayas Ltd | Wholesale & retail | 2025 |
| North 1969 Limited | Extraterritorial | 2015 |
| Northdale Surveyors Ltd | Professional & scientific | 2023 |
| Northern BED Company Ltd | Manufacturing | 2025 |
| Northern Counties Posters Limited | Other services | 1984 |
| Northern Drafting Ltd | Professional & scientific | 2026 |
| Northern Riding Development Co Ltd | Construction | 2021 |
| Northgate Accountants Ltd | Professional & scientific | 2026 |
| Northsmith Emporium Limited | Wholesale & retail | 2025 |
| Northstar Collections Limited | Wholesale & retail | 2026 |
| Northstar Incorporation Limited | Manufacturing | 2026 |
| Northstar Yorkshire Limited | Wholesale & retail | 2026 |
| Northstone Property Partners Limited | Real estate | 2026 |
| Noura Modestwear Ltd | Wholesale & retail | 2024 |
| Novadrive Limited | Wholesale & retail | 2025 |
| Nowrooz Grill Ltd | Hospitality | 2024 |
| Nowrooz Grillhouse Ltd | Hospitality | 2025 |
| NP Investments and Properties Ltd | Real estate | 2026 |
| NR Elite Properties Ltd | Real estate | 2024 |
| Nrmk Limited | Real estate | 2017 |
| NT Private Ltd | Manufacturing | 2023 |
| NTI Consultants Ltd | Information & communication | 2014 |
| Numaan AJ Ltd | Administrative & support | 2025 |
| Oakwell Construction Ltd | Construction | 2022 |
| OB Management Ltd | Other services | 2018 |
| Ocean Component Solutions Ltd | Wholesale & retail | 2023 |
| Ocean Components Ltd | Wholesale & retail | 2021 |
| Ochola Service Ltd | Administrative & support | 2024 |
| Ohmega Electrical Ltd | Construction | 2011 |
| Okayletsgotravels Ltd | Administrative & support | 2026 |
| Olakor Trans Ltd | Transport & logistics | 2019 |
| Olde ENG Fisheries Batley Ltd | Hospitality | 2026 |
| Olive Consultancy Services Ltd | Professional & scientific | 2023 |
| Olive Crest Ltd | Real estate | 2025 |
| Olive Finance Ltd | Administrative & support | 2003 |
| Oliver Barton Ltd | Wholesale & retail | 2020 |
| Omega Tools Ltd | Wholesale & retail | 2025 |
| ON Point Couriers Limited | Transport & logistics | 2024 |
| One Holding North Limited | Manufacturing | 2008 |
| One Nation Ventures Ltd | Wholesale & retail | 2023 |
| One Stop MOT Station Limited | Wholesale & retail | 2025 |
| Online Blinds Express Ltd | Wholesale & retail | 2020 |
| Online Dealz Limited | Wholesale & retail | 2023 |
| Online for YOU (Yorkshire) Limited | Wholesale & retail | 2024 |
| Onlycats by Pablo Ltd | Wholesale & retail | 2026 |