| Mpcx Limited | Professional & scientific | 2017 |
| MQ Valet Services Limited | Administrative & support | 2023 |
| MS Accountancy Yorkshire Limited | Professional & scientific | 2024 |
| MSE Automotive Limited | Wholesale & retail | 2024 |
| MTF Building Services Limited | Construction | 2021 |
| MTG Building Services & Management Ltd | Construction | 2021 |
| Mtrotter Design Ltd | Information & communication | 2018 |
| Mungo JLR Limited | Manufacturing | 2025 |
| Munyurwa Medical Limited | Health & social care | 2017 |
| Mutagi Medical Consultancy Limited | Health & social care | 2011 |
| Mymaths Class Ltd | Education | 2019 |
| N&S (Ashton) Limited | Wholesale & retail | 2019 |
| NA Energy Solutions Ltd | Professional & scientific | 2022 |
| National Optical Limited | Health & social care | 2018 |
| Natural Fibre TEX Limited | Agriculture & fishing | 2011 |
| ND Pipefitters Limited | Construction | 2009 |
| Nd&Ng Properties Limited | Real estate | 2021 |
| NDS Holdco Limited | Financial services | 2025 |
| Neil Hirst Construction Limited | Construction | 2013 |
| Nest Photography Limited | Professional & scientific | 2018 |
| Neuroinclusive Psychology Limited | Education | 2026 |
| New Canton Garden Limited | Hospitality | 2020 |
| New Hall Properties (Hagg Lane) Limited | Construction | 2018 |
| New Hall Properties Group Limited | Financial services | 2024 |
| New Image Sign Design Limited | Construction | 1998 |
| New Leaves Studio Limited | Arts & recreation | 2012 |
| New London Projects Limited | Wholesale & retail | 2009 |
| NEW2GAS Limited | Other services | 2021 |
| Newspoint (Bullring) Ltd | Wholesale & retail | 2003 |
| Newspoint (Lowry) Limited | Wholesale & retail | 2002 |
| Newspoint (Wembley) Ltd | Wholesale & retail | 2013 |
| Newspoint Arcade Ltd | Wholesale & retail | 2023 |
| Newspoint BL Ltd | Wholesale & retail | 2020 |
| Next Phase Electrical Contractors Ltd | Construction | 2025 |
| NH Praxis Ltd | Professional & scientific | 2026 |
| Night & Day Mirfield Ltd | Hospitality | 2022 |
| NM Recruitment Limited | Administrative & support | 2026 |
| North Forest Renewables Ltd | Real estate | 2014 |
| North Lodge Media Limited | Information & communication | 2010 |
| North Star Psychology Ltd | Health & social care | 2021 |
| North West Welfare Foundation | Health & social care | 2026 |
| Northern Club Developments Ltd | Real estate | 2006 |
| Northern Disposal Services Limited | Water & waste | 1987 |
| Northern Feather (Home Furnishings) Limited | Extraterritorial | 1991 |
| Northern Textiles PLC | Extraterritorial | 1989 |
| Northfields Mirfield Limited | Education | 2023 |
| Northorpe Hall Child & Family Trust | Health & social care | 2010 |
| Northorpe Hall Trading Company Limited | Hospitality | 2010 |
| Northway Crescent Ltd | Information & communication | 2018 |
| Novaloo Ltd | Wholesale & retail | 2018 |
| NRG for Life Ltd | Health & social care | 2025 |
| NSR Medical Limited | Health & social care | 2017 |
| Nurtured Life Limited | Extraterritorial | 2011 |
| NXS Tech Ltd | Administrative & support | 2025 |
| O'Donnell, Retail Experience & Store Design Limited | Professional & scientific | 2018 |
| Oates, Ripley and Co Limited | Professional & scientific | 2004 |
| Odhar Suntime Company Limited(The) | Real estate | 1983 |
| Old Engine Close Management Company Limited | Households | 2019 |
| Olicana Group Limited | Professional & scientific | 2021 |
| Olitom Properties Limited | Real estate | 2024 |
| Olympias Management Limited | Real estate | 2024 |
| ON IT Technology Partners Ltd | Information & communication | 2023 |
| One Call Social Care Ltd | Administrative & support | 2023 |
| One Step Refurb Ltd | Construction | 2020 |
| One Stop Business Systems and Start UP Guidance Ltd | Real estate | 2012 |
| Onebuild Limited | Professional & scientific | 1997 |
| Opex Glow Ltd | Wholesale & retail | 2023 |
| Orange Design Studio Ltd | Other services | 2021 |
| Orb-Hub Limited | Health & social care | 2026 |
| Orchard Developments (AS) Limited | Construction | 2014 |
| Organiza Limited | Real estate | 2013 |
| Oscura Projects Ltd | Construction | 2026 |
| Oscura Ventures Ltd | Construction | 2026 |
| OWL Psychology Limited | Education | 2019 |
| P Wilson Limited | Other services | 2012 |
| P.L.D.C. Limited | Extraterritorial | 1984 |
| Paired Marketing and Brand Ltd | Professional & scientific | 2026 |
| Pakprint Tapes Limited | Manufacturing | 1981 |
| Pandscorals Ltd | Agriculture & fishing | 2019 |
| Panesar Bros Ltd | Hospitality | 2025 |
| Paradise Takeaway (Mirfield) Limited | Hospitality | 2011 |
| Paragon Oak Limited | Construction | 2011 |
| Park Avenue Mews Management Company Limited | Households | 1998 |
| Park Glass Hospitality Ltd | Hospitality | 2025 |
| Parker & Howley Ltd | Manufacturing | 2018 |
| Paveley HR Solutions Ltd. | Administrative & support | 2023 |
| Paws & Pals Ltd | Other services | 2021 |
| Penguin Acting & Theatre Productions C.I.C. | Administrative & support | 2019 |
| Penneys Transport Co. Limited | Extraterritorial | 1944 |
| Pepperdog Design Limited | Professional & scientific | 2008 |
| Petch Homes Limited | Financial services | 2022 |
| Petra Properties Limited | Real estate | 2019 |
| Pharma Biotech System Components Limited | Construction | 2004 |
| Phillip Maddison Legal Consultants Ltd | Professional & scientific | 2023 |
| Philshaw Ltd | Real estate | 2024 |
| Phoebe Farr Limited | Other services | 2024 |
| Phoenix Lifestyles Limited | Real estate | 2019 |
| Photography Works Limited | Information & communication | 1999 |
| Pine Lodge Construction Ltd | Construction | 2010 |
| Pine Lodge Living Limited | Real estate | 2019 |