| MRJ IT Services Ltd | Information & communication | 2025 |
| MRS Cooke's Dog Services Limited | Administrative & support | 2022 |
| MSG - Marketing and Events Limited | Professional & scientific | 2006 |
| MTS Electrical (Goole) Limited | Construction | 2019 |
| MUD Hawgz Off-Road UK Ltd | Manufacturing | 2022 |
| Mumbai KS Ltd | Hospitality | 2024 |
| Murdock Business Solutions Limited | Professional & scientific | 2012 |
| Murphys Pool & Snooker Club Limited | Hospitality | 2020 |
| Murphys Sports Bar Goole Limited | Hospitality | 2024 |
| Murphys Sports Bar Langold Limited | Hospitality | 2026 |
| Muted Bloom Ltd | Information & communication | 2025 |
| MWM Builds Limited | Real estate | 2024 |
| MWM Enterprises Limited | Financial services | 2026 |
| MWP Solutions Limited | Professional & scientific | 2025 |
| My Daily Uplift Ltd | Education | 2023 |
| My Science Club Ltd | Education | 2021 |
| Myrtle Grange Renewables Limited | Energy | 2015 |
| N C Bodrum Limited | Hospitality | 2024 |
| N7 Recycling Ltd | Mining & quarrying | 2022 |
| NA & S Moore Limited | Agriculture & fishing | 2013 |
| Nails by Sapphire Limited | Other services | 2025 |
| Nationwide Concrete Pumping Ltd | Construction | 2019 |
| Nationwide Diamond Contracts Limited | Construction | 2003 |
| Nationwide Fire and Life Safety Systems Limited | Manufacturing | 2018 |
| Nature Therapist Ltd | Education | 2026 |
| NB Rowland Financial Limited | Financial services | 2021 |
| NCA Properties Limited | Real estate | 2021 |
| Neal Rawlinson Consultancy Ltd | Professional & scientific | 2018 |
| Neatview Limited | Professional & scientific | 1995 |
| Nestaccountancy Ltd | Professional & scientific | 2025 |
| Neuraxis Consulting Ltd | Wholesale & retail | 2026 |
| New AAA Ltd | Hospitality | 2017 |
| New Charcoal Grill Ltd | Hospitality | 2024 |
| New Freedom Publications Limited | Extraterritorial | 1997 |
| New Space Kitchens & Bathrooms Limited | Construction | 2021 |
| New Space Renovations Yorkshire Ltd | Construction | 2019 |
| Newclose Mortgages Ltd | Professional & scientific | 2020 |
| Newflex Systems Limited | Information & communication | 2013 |
| Newsafe Solutions Ltd | Professional & scientific | 2024 |
| Newsholme Developments Limited | Construction | 2021 |
| Next Property Group Ltd | Real estate | 2025 |
| Nextgen Racing Ltd | Arts & recreation | 2025 |
| Nextphase Energy Ltd | Construction | 2016 |
| NH MOD Techs Ltd | Manufacturing | 2017 |
| Nine North Limited | Extraterritorial | 2020 |
| NIP NIP Catnip Ltd | Wholesale & retail | 2025 |
| NJC Cards & Gifts Ltd | Wholesale & retail | 2026 |
| NK Building and Construction Ltd | Construction | 2025 |
| NKB Lettings Ltd | Real estate | 2023 |
| NMS Consulting Limited | Information & communication | 2010 |
| NNK Building Services Ltd | Construction | 2022 |
| Noble Boat Training Ltd | Administrative & support | 2023 |
| Noble Environmental Solutions Ltd | Administrative & support | 2015 |
| Noble House Estates Limited | Real estate | 1995 |
| Noorain Ltd | Wholesale & retail | 2025 |
| Norman Zaifert Limited | Construction | 1987 |
| North Load Haulage Ltd | Transport & logistics | 2026 |
| North Star Defence Ltd | Information & communication | 2026 |
| Northern Business Associates Ltd | Professional & scientific | 2007 |
| Northern Cranes and Lifting Ltd | Professional & scientific | 2025 |
| Northern Skies Aviation Ltd | Wholesale & retail | 2021 |
| Northern Straw Co. Limited | Agriculture & fishing | 1980 |
| Northern Transportation Planning Limited | Construction | 2009 |
| Notjustyoga Ltd | Other services | 2025 |
| NOX Engineering Services Limited | Construction | 2013 |
| Npowa Limited | Wholesale & retail | 2014 |
| NSM Jukebox Refurbishments Ltd | Wholesale & retail | 2023 |
| NSM Jukebox Sales Ltd | Wholesale & retail | 2023 |
| NSM Jukebox Services Ltd | Wholesale & retail | 2023 |
| Nsure.Environmental Ltd | Professional & scientific | 2023 |
| NT Services (Yorks) Ltd | Manufacturing | 2026 |
| Nth-Term Consultancy Limited | Education | 2015 |
| Nucad Computers and Design Limited | Professional & scientific | 2012 |
| Nugget Holdings Limited | Real estate | 2025 |
| Nuova Vita Design Ltd | Professional & scientific | 2018 |
| Nurture Naturally Childcare Services (Nncs) Ltd. | Education | 2015 |
| Nutwood Group Limited | Wholesale & retail | 2018 |
| O&H Vehicle Conversions Group Limited | Other services | 2019 |
| Oaklands Project Management Ltd | Construction | 2019 |
| Oakleaf Applications Limited | Information & communication | 2025 |
| Oakleaf Cabinet Makers Limited | Construction | 2005 |
| Oakley by Emily Ltd | Professional & scientific | 2025 |
| Ocean Star Seafoods Limited | Wholesale & retail | 2003 |
| October 16 Consulting Limited | Public administration | 2020 |
| Offergeld Logistics UK Limited | Transport & logistics | 2003 |
| OGS Builds Ltd | Construction | 2025 |
| OGS Landscaping Ltd | Administrative & support | 2020 |
| OHA Developments Ltd | Professional & scientific | 2018 |
| Oisin Property Solutions Limited | Real estate | 2025 |
| Old Goole Commercials Ltd | Wholesale & retail | 2025 |
| Oldroyd Plant Ltd | Administrative & support | 2018 |
| Oldyard Holdings Ltd | Financial services | 2018 |
| Oleksy Transport Ltd | Transport & logistics | 2017 |
| Olive Grove Property Limited | Households | 2013 |
| Olive Tree Day Nursery Ltd | Education | 2013 |
| Oliver Thomas Transport Limited | Transport & logistics | 2021 |
| Oliver's Wharf Limited | Transport & logistics | 2014 |
| Omega Projects Limited | Construction | 2014 |
| OMG 888 Collections/Advances Loans Property Lettings and Leasing Ltd | Financial services | 2021 |
| OMG 888 Limited | Real estate | 2017 |