| Newberry Homes Limited | Construction | 1993 |
| Newblair Limited | Real estate | 2002 |
| Newbold Optical Ltd | Health & social care | 2015 |
| Newdigitech Ltd | Information & communication | 2015 |
| Newhill Investments Limited | Real estate | 1960 |
| News Food & Booze Ltd | Wholesale & retail | 2007 |
| News Light Ltd | Wholesale & retail | 2007 |
| Newton Leisure Limited | Hospitality | 1990 |
| Next GEN Scholars Ltd | Education | 2025 |
| Nextgan Ltd | Other services | 2025 |
| Nexus Move Ltd | Transport & logistics | 1973 |
| Nicholls Lindsay Ltd | Professional & scientific | 2006 |
| Nicholson's Farm and Industrial Buildings Limited | Construction | 2003 |
| Nick Irlam Limited | Construction | 2003 |
| Nigel Holmes Limited | Wholesale & retail | 1976 |
| Nikki Kelly Properties Limited | Real estate | 2004 |
| Nikki Sanderson Limited | Other services | 2006 |
| Nizam Limited | Health & social care | 2002 |
| NO. 3 Whitehall Ltd | Hospitality | 2007 |
| Noel Jones Court Management Company Limited | Households | 1994 |
| Norbreck Nurseries Limited | Wholesale & retail | 2003 |
| Norcomm (UK) Limited | Construction | 1997 |
| Norman Walsh Footwear Ltd | Administrative & support | 2003 |
| Normanhurst Consultancy Services Ltd | Professional & scientific | 2001 |
| Normanhurst Enterprises Limited | Hospitality | 1975 |
| North - Fork Limited | Wholesale & retail | 2006 |
| North Euston Ltd. | Hospitality | 2001 |
| North Eye-Care Limited | Health & social care | 2002 |
| North Star Estate Agents, Currency & Ticketing Ltd | Administrative & support | 2007 |
| North West Screen and Design Limited | Wholesale & retail | 1998 |
| Northern Accident Repair Company Limited | Wholesale & retail | 2000 |
| Northern Audio Copy Limited | Arts & recreation | 1990 |
| Northern Land Investments ( Mayfield) Ltd | Real estate | 2025 |
| Northern Land Investments (Horsforth ) Ltd | Real estate | 2026 |
| Northern Letting Services Limited | Real estate | 2007 |
| Northern Morris Cinemas (Bowness) Limited | Information & communication | 2003 |
| Northern Properties Limited | Professional & scientific | 1994 |
| Northern Research Centre Ltd. | Information & communication | 1997 |
| Nortons Hiab Services Limited | Transport & logistics | 2007 |
| Norwest Insurance Limited | Financial services | 1973 |
| Nostrum Deeyeo Limited | Wholesale & retail | 2026 |
| Notarianni Brothers (Blackpool) Limited | Hospitality | 1948 |
| Nova Recreation Limited | Extraterritorial | 1971 |
| Noye Equipment Hire Ltd | Administrative & support | 2022 |
| NR Components (Todmorden) Limited | Manufacturing | 1982 |
| NST Accountants Ltd | Professional & scientific | 2002 |
| Nurbhai Holdings Limited | Real estate | 2000 |
| Nutri-Organic Limited | Manufacturing | 2000 |
| Nutrition Group PLC | Manufacturing | 2007 |
| Nuts Engineering Supplies Limited | Wholesale & retail | 2001 |
| NWC Estates Limited | Real estate | 2007 |
| Nychem Limited | Administrative & support | 2002 |
| O'Brien Payroll UK Limited | Professional & scientific | 2003 |
| O'Brien Siddle Dental Care Limited | Health & social care | 2009 |
| O-G Joinery Limited | Manufacturing | 2018 |
| Oak Coppice Residents Association Limited | Households | 1996 |
| Oak Environmental Solutions Limited | Professional & scientific | 2006 |
| Oakley Holidays | Arts & recreation | 2002 |
| Oakwood Mobility Limited | Wholesale & retail | 2002 |
| Ohlsson Psychology Ltd | Health & social care | 2020 |
| OHW Project Consultancy Limited | Information & communication | 2004 |
| Old Hall Developments Limited | Professional & scientific | 1989 |
| Old Turner and Brown | | 1994 |
| Oliver Amey Limited | | 1949 |
| Oliver J Martin Limited | Construction | 1978 |
| Olympic Lock & Safeguards Limited | Wholesale & retail | 1986 |
| OMC Motor Holdings Limited | Professional & scientific | 2000 |
| One Offs Limited | Manufacturing | 2001 |
| Online Enterprises Limited | Wholesale & retail | 1999 |
| OPEN2ALL Limited | Professional & scientific | 2000 |
| Optimised Group Limited | Professional & scientific | 2019 |
| Optimize-Av Ltd | Professional & scientific | 2013 |
| Optimus Waverley Limited | Real estate | 2022 |
| Opulence Design & Build Ltd | Real estate | 2024 |
| Oracle Accountants Limited | Professional & scientific | 2003 |
| Orchard Dene Holdings Limited | Financial services | 2004 |
| Origin Recruitment Limited | Health & social care | 2000 |
| Ormeshers Garage Limited | Wholesale & retail | 2006 |
| Osborne Delta (Lightning Conductors) Limited | Construction | 1980 |
| Oscar Bears Limited | Education | 1995 |
| Oswald House Ltd | Education | 2006 |
| Otrip Limited | Information & communication | 2025 |
| Outram Electrical Services Ltd | Construction | 1996 |
| Overton Jersey Ltd | Wholesale & retail | 2025 |
| P & S Nelson Limited | Transport & logistics | 2003 |
| P Clark Agriculture Limited | Wholesale & retail | 2003 |
| P D Padgett Ltd | Construction | 1999 |
| P Dalton Electrical Contractors Limited | Manufacturing | 2004 |
| P G Builders Limited | Construction | 2002 |
| P H Jewellers Limited | Wholesale & retail | 2005 |
| P K Moorview Limited | Households | 2024 |
| P W V Thomas Limited | Administrative & support | 2004 |
| P-Gros Supplies Limited | Wholesale & retail | 2007 |
| P. & L. Glass Limited | Manufacturing | 2000 |
| P. Bates Plumbing & Heating Limited | Construction | 2003 |
| P.R.S. Electrical Contractors Ltd. | Construction | 2002 |
| Pablo's Restaurant Limited | Hospitality | 2004 |
| PAC Contracts Limited | Administrative & support | 2003 |
| Pacific Heating & Plumbing Limited | Construction | 2007 |
| Page One Design Limited | Professional & scientific | 2003 |