| MRR Vegetable Agronomy Limited | Agriculture & fishing | 2003 |
| MT Services (NE) Ltd | Wholesale & retail | 2022 |
| MUD Crab Industries Ltd | Hospitality | 2013 |
| Muddy Souls UK Ltd. | Agriculture & fishing | 2012 |
| Mudzudza Enterprises Limited | Health & social care | 2007 |
| Mulberry Properties ( Yorkshire ) Limited | Construction | 2015 |
| Multi-Wall Systems Limited | Construction | 2009 |
| Multiwal UK Limited | Construction | 2016 |
| Muritz Logistics Ltd | Transport & logistics | 2023 |
| Musgrave Transport Limited | Transport & logistics | 1992 |
| Musicianpro Ltd. | Administrative & support | 2016 |
| MW Keeping Ltd | Arts & recreation | 2022 |
| MWE Woodworking Limited | Manufacturing | 2003 |
| My Property Media Ltd | Information & communication | 2024 |
| My Swim Hub Limited | Information & communication | 2025 |
| Mybridal Software Limited | Information & communication | 2023 |
| N P Smith Homes Limited | Real estate | 2019 |
| N, D and S Sellers Limited | Administrative & support | 2017 |
| N.E. Services Limited | Manufacturing | 2001 |
| N.L.C. (Driffield) Limited | Construction | 2013 |
| N.S. Wilmot (Sheet Metal Fabrication) Limited | Manufacturing | 2003 |
| N.S.Rodgers Transport Ltd | Transport & logistics | 2020 |
| NAB Management Solutions Limited | Professional & scientific | 2013 |
| Nafferton Investments Limited | Hospitality | 2025 |
| Nafferton Wold Farms Limited | Agriculture & fishing | 1996 |
| Narom Consulting Limited | Professional & scientific | 2020 |
| Ndgf Limited | Energy | 2013 |
| Near-Us Ltd. | Information & communication | 2013 |
| Neela Spice Ltd | Hospitality | 2026 |
| Neil Mitchell Horticultural and Gardening Services Ltd | Administrative & support | 2022 |
| Nerdx Ltd | Professional & scientific | 2025 |
| NET Zero Buildings Finance Limited | Financial services | 2015 |
| NET Zero Buildings Holding Limited | Financial services | 2015 |
| NET Zero Buildings Limited | Construction | 2013 |
| Nether Developments Limited | Real estate | 2002 |
| Network Adults Placement Agency Limited | Administrative & support | 2014 |
| Neupauer Ltd | Other services | 2023 |
| Neurobeans Psychology Services Ltd | Health & social care | 2026 |
| Neurological Solutions Limited | Health & social care | 2011 |
| New Bollywood Ltd | Hospitality | 2023 |
| New Inn Aberchirder Limited | Hospitality | 2011 |
| New Walk Consulting Limited | Professional & scientific | 2021 |
| Newlay Asphalt East Limited | Manufacturing | 2021 |
| Newlay Asphalt Limited | Manufacturing | 2013 |
| Newlay Holdings Limited | Financial services | 2024 |
| Nexus Commercial Management Limited | Professional & scientific | 2018 |
| NH Waites Limited | Wholesale & retail | 2019 |
| Niche Operable Systems Limited | Construction | 1995 |
| Nicholson Haulage Services Ltd | Transport & logistics | 2026 |
| Nightowl Fireworks Ltd | Arts & recreation | 2023 |
| Nilaa ( Yorkshire ) Limited | Health & social care | 2015 |
| NL Travel Ltd | Administrative & support | 2025 |
| Noise & Vibration Solutions UK Ltd | Professional & scientific | 2025 |
| Nonoxynol Holdings Limited | Wholesale & retail | 2018 |
| Norcon Construction Ltd | Construction | 2011 |
| Norcon Holdings Limited | Construction | 2019 |
| North Dalton Diagnostics Ltd | Health & social care | 2023 |
| North Dalton Vision Limited | Real estate | 2019 |
| North Humberside Precision Engineers ( Driffield ) Limited | Professional & scientific | 2012 |
| Northcliffe & Seaview Holiday Parks Limited | Hospitality | 2005 |
| Northern Angels Care Ltd | Health & social care | 2023 |
| Northern LOG Cabins Limited | Administrative & support | 2021 |
| Northern Shores Marine Consultancy Ltd | Agriculture & fishing | 2020 |
| Northern Wisp Limited | Arts & recreation | 2024 |
| Northstead Design Limited | Professional & scientific | 2000 |
| Novus (Leeds) Limited | Professional & scientific | 2013 |
| NRP Services Ltd | Construction | 2016 |
| NSB Engineering Limited | Professional & scientific | 2010 |
| NSS Driffield Ltd | Hospitality | 2026 |
| NSV Realisations 2022 Limited | Manufacturing | 2012 |
| Number 8 Swanland Avenue Flat Management Limited | Households | 1998 |
| Nunkeeling Renewables Limited | Agriculture & fishing | 2011 |
| Nutrapet Limited | Agriculture & fishing | 2006 |
| NZB Investments Limited | Real estate | 2016 |
| Oakpast Limited | Administrative & support | 2008 |
| Oakstead Business Investments Ltd | Health & social care | 2023 |
| Oakstead Homes Ltd | Real estate | 2020 |
| Oats Royd Foods Limited | Manufacturing | 2022 |
| OB2 Cleaning Services Ltd | Administrative & support | 2026 |
| Ocker House Ltd | Wholesale & retail | 2023 |
| OH SEW Bespoke Limited | Manufacturing | 2025 |
| Old Byland Woodlands Limited | Agriculture & fishing | 2003 |
| Old Macdonalds Children's Day Care Nursery Ltd | Education | 2002 |
| ON Form Media Ltd | Professional & scientific | 2020 |
| One Shop Mini Market Ltd | Wholesale & retail | 2025 |
| Onlookers Opticians Limited | Wholesale & retail | 2002 |
| Optimal Software Limited | Information & communication | 2009 |
| Orange Power Ltd | Manufacturing | 2020 |
| Orchard House ( PIG Management and Trading ) Ltd | Agriculture & fishing | 2017 |
| Orchard House (Driffield) Consulting Limited | Agriculture & fishing | 2012 |
| Order Food (UK) Ltd | Information & communication | 2025 |
| Origin Property Investment Limited | Real estate | 2010 |
| Orion James Property Ltd | Real estate | 2025 |
| Ortus Stays Ltd | Households | 2025 |
| Osler Holding Limited | Administrative & support | 2020 |
| OTB Mechanical Engineers Ltd | Construction | 2016 |
| OTB Properties Ltd | Real estate | 2017 |
| Oxalis Group Ltd | Hospitality | 2026 |
| Oyster Aviation Ltd. | Arts & recreation | 2019 |
| P a Trading Limited | Households | 2019 |