| Nex-Fluence Ltd | Professional & scientific | 2026 |
| Nexesflowconsulting Ltd | Wholesale & retail | 2025 |
| Nexusrisions Ltd | Wholesale & retail | 2025 |
| NGB Fisheries Ltd | Agriculture & fishing | 2006 |
| Nice Time | Arts & recreation | 1996 |
| Nikkis Limited | Wholesale & retail | 2003 |
| Nirenet Limited | Information & communication | 2007 |
| NLB1 Holdings Ltd | Wholesale & retail | 2025 |
| Noble Venture Limited | Administrative & support | 1996 |
| Noel Johns Limited | Hospitality | 1958 |
| None Go BYE Farm Shop Limited | Wholesale & retail | 2005 |
| Nooter/Eriksen Limited | Manufacturing | 1999 |
| Norman's Property Limited | Real estate | 2007 |
| Northbream Solutions Ltd | Wholesale & retail | 2025 |
| Northern Complainant AID Fund | Other services | 1991 |
| Northern Lights Creative Limited | Administrative & support | 2004 |
| Northern Music Co. Ltd | Administrative & support | 2005 |
| Northern Utilities (Management) Limited | Wholesale & retail | 2004 |
| Northgate Halifax Limited | Administrative & support | 2005 |
| Norwood Homes Westgate LLP | | 2005 |
| Norwood of Shipley Limited | Transport & logistics | 1958 |
| Nostalgic Developments Limited | Professional & scientific | 2004 |
| Novoetream Technologies Ltd | Wholesale & retail | 2025 |
| Novyasparkssystems Ltd | Wholesale & retail | 2025 |
| NRF Limited | Manufacturing | 2004 |
| NSS Properties Limited | Real estate | 2006 |
| Nufarm Limited | Manufacturing | 1906 |
| Number 11 Hanover Square Limited | Real estate | 1986 |
| Number Thirteen Management Limited | Extraterritorial | 1984 |
| NUMBER9 Services Limited | Construction | 2003 |
| NUR Medical Ltd | Health & social care | 2007 |
| O & C Car Parks Limited | Wholesale & retail | 1998 |
| O & C Management Services Limited | Administrative & support | 2000 |
| O & S Haughey Limited | | 1994 |
| O'Donnell Steel Structures Limited | Construction | 2006 |
| Oak Red Limited | Real estate | 2006 |
| Oakes Manor Construction Ltd | Construction | 2005 |
| Oakwood Acorns Limited | Health & social care | 2007 |
| OBS Civil Engineering Limited | Construction | 2007 |
| Ogbonson Bowling Services Limited | Construction | 1999 |
| Okehigh Limited | Professional & scientific | 1989 |
| Old School Innovations Limited | Wholesale & retail | 2009 |
| Oldgate House (Management Company) Limited | Households | 2015 |
| Oldroyd Building & Design Limited | Construction | 1994 |
| Oldroyd Investments Limited | Construction | 1997 |
| Olivia Developments Limited | Real estate | 2004 |
| OM Partners UK Limited | Information & communication | 1998 |
| One Developments Ltd | Construction | 2003 |
| Onward Transport Limited | Transport & logistics | 2026 |
| Openfield Solutions Limited | Administrative & support | 1999 |
| Optical Outlook Limited | Wholesale & retail | 1996 |
| Orange Camel Limited | Transport & logistics | 2003 |
| Orchard Properties (Dewsbury) Limited | Real estate | 2001 |
| Oreya Limited | Wholesale & retail | 2002 |
| Originals Yeadon Limited | Other services | 2002 |
| Orion Land & Planning Limited | Professional & scientific | 2004 |
| Orkla Foods UK PLC | Wholesale & retail | 1959 |
| OSA Risk Management Limited | Health & social care | 2006 |
| Osmose Consulting Limited | Professional & scientific | 2004 |
| Ossett Brewery Taverns Limited | Manufacturing | 2007 |
| Ossett Tyre House Limited | Wholesale & retail | 1980 |
| Outlook Installations Limited | | 2003 |
| Overseas Freight Services Limited | Information & communication | 1991 |
| Owdoo Limited | Administrative & support | 2007 |
| Owlcotes Fisheries Limited | Hospitality | 2006 |
| Ownglen Limited | Professional & scientific | 1983 |
| Oxet Limited | Wholesale & retail | 2004 |
| Oxland Consulting Limited | Professional & scientific | 2005 |
| P & K Patel Limited | Wholesale & retail | 2004 |
| P & R Robinson Limited | Agriculture & fishing | 2002 |
| P Egan Agencies Ltd | Other services | 2007 |
| P M Accountancy UK Limited | Professional & scientific | 2004 |
| P S Oades & Sons Limited | Transport & logistics | 1994 |
| P Tempest Civils Limited | Construction | 2003 |
| P&L Wood Ltd | Other services | 2026 |
| P. and J. Distribution Limited | Wholesale & retail | 1985 |
| P. K. Martin Limited | Wholesale & retail | 1995 |
| P.A. Schofield Limited | Construction | 1996 |
| P.R.O. Construction Limited | Construction | 1992 |
| Pacetheme Limited | Arts & recreation | 1990 |
| Packet Media Holdings Limited | Financial services | 2008 |
| Packet Media Limited | Information & communication | 2002 |
| Paddico (284) Limited | Professional & scientific | 2007 |
| Pakistan Association Huddersfield | Health & social care | 2005 |
| Pakistani Bazaar Limited | Wholesale & retail | 2006 |
| Panicco Lifts PLC | | 1993 |
| Park Lane Property Investments Limited | Real estate | 2002 |
| Park Square Property Management Limited | Real estate | 1993 |
| Parkinson Consultancy Services Ltd | Information & communication | 2007 |
| Parnaby Stores Limited | Wholesale & retail | 2006 |
| Path Into Recruitment Ltd | Administrative & support | 2007 |
| Pattinsons (Windermere) Limited | Professional & scientific | 1913 |
| Paul Builders Ltd | Construction | 2016 |
| Paul Caddick (Agricultural) Limited | Agriculture & fishing | 1990 |
| Paul Gearey Construction Limited | Construction | 2005 |
| Paul Horsley Acoustics Limited | Construction | 2005 |
| Paul R Smith Limited | Professional & scientific | 2006 |
| Pawa Consulting Limited | Professional & scientific | 2000 |
| PB External Insulation Company Limited | Construction | 1994 |
| PBT Homes Limited | Real estate | 2007 |