| New Image Graphics Limited | Other services | 2023 |
| New Inn Brew Co Ltd | Manufacturing | 2023 |
| New Laithe Consultancy Ltd | Construction | 2023 |
| New Light Solutions Ltd | Professional & scientific | 2018 |
| Newholme Developments Limited | Real estate | 2025 |
| Newlands Coaching and Consulting Ltd | Professional & scientific | 2023 |
| Newlands H and I Ltd | Construction | 2020 |
| Newmarket Street Holdings Limited | Financial services | 2026 |
| Newmarket Vaults Limited | Hospitality | 2026 |
| Nexjob Ltd | Information & communication | 2024 |
| Nexus DCC Ltd | Manufacturing | 2025 |
| NGB Enterprise Ltd | Hospitality | 2023 |
| Nick Tofalos Osteopathy Ltd | Health & social care | 2011 |
| Nick Wilkinson Technical Surveyor Limited | Professional & scientific | 2009 |
| Nicris Limited | Extraterritorial | 2006 |
| Niffany Properties Limited | Construction | 2001 |
| Nigel Spencer Plumbing and Heating Limited | Construction | 2005 |
| Nigel Steel Construction Ltd | Professional & scientific | 2016 |
| Night Spark Ltd | Manufacturing | 2006 |
| Nightshade Bars Ltd | Hospitality | 2024 |
| Nilorn Property Development UK Ltd | Real estate | 2018 |
| Nilorn UK Limited | Manufacturing | 1947 |
| Nineteen Eighty Two Limited | Wholesale & retail | 2024 |
| NL Jones Planning Ltd | Professional & scientific | 2021 |
| Nmje Ltd | Hospitality | 2016 |
| Noahark Inspection Services Ltd | Professional & scientific | 2022 |
| Noriker Consulting Engineers Ltd. | Professional & scientific | 2017 |
| North Blinds Ltd | Wholesale & retail | 2022 |
| North Country Consulting Limited | Professional & scientific | 2024 |
| North Star Joinery Ltd | Manufacturing | 2025 |
| North West Property Rentals Ltd | Real estate | 2018 |
| North Yorkshire Holiday Cottages Limited | Hospitality | 2016 |
| North Yorkshire Mortgages Limited | Financial services | 1988 |
| NORTH2SOUTH Training Consultants Ltd | Professional & scientific | 2014 |
| Northcote Systems Ltd | Professional & scientific | 2022 |
| Northerly Ltd | Professional & scientific | 2024 |
| Northern Fire Safety Ltd | Public administration | 2021 |
| Northern Labels Limited | Manufacturing | 2005 |
| Northern LAD Ltd | Professional & scientific | 2024 |
| Northern Off-Road Club Limited | Arts & recreation | 1982 |
| Northern Rights Limited | Professional & scientific | 2016 |
| Northern Star Academies Trust | Education | 2011 |
| Northern Trout Limited | Extraterritorial | 2010 |
| Norton Tower Associates Ltd | Professional & scientific | 2022 |
| Nova Zora Ltd | Wholesale & retail | 2025 |
| Novo Mundo Consulting Limited | Financial services | 2022 |
| Novo Mundo Limited | Professional & scientific | 2020 |
| Novo Terrae Holdings Limited | Financial services | 2025 |
| NPA Hub Ltd | Transport & logistics | 2024 |
| NPC Architectural Designs Ltd | Professional & scientific | 2015 |
| NPS Electrical Limited | Construction | 2021 |
| NPT Property Lettings Ltd | Real estate | 2023 |
| Nvng Properties Limited | Real estate | 2011 |
| Nwncs Ltd | Professional & scientific | 2024 |
| NY Group Ltd | Hospitality | 2023 |
| O'Briens Bookkeeping Services Ltd | Professional & scientific | 2021 |
| Oak Apartments Limited | Real estate | 2013 |
| Oak Deane Developments Limited | Construction | 2025 |
| Oak Valley Holdings Limited | Professional & scientific | 2023 |
| Oakley's Grill & Pizzeria Limited | Hospitality | 2016 |
| Oaktree Bidco Limited | Extraterritorial | 2017 |
| Oaktree Midco Limited | Extraterritorial | 2017 |
| Oaktree Topco Limited | Extraterritorial | 2017 |
| Obrigado Limited | Extraterritorial | 2021 |
| Occupational Wellbeing Limited | Health & social care | 2003 |
| Ockerbywilson Ltd | Wholesale & retail | 2026 |
| OCS Developments Ltd | Construction | 2015 |
| Octavius Consulting Limited | Information & communication | 2010 |
| OFF the Record Burnley Limited | Hospitality | 2025 |
| Offshore Fibre Techs Ltd | Construction | 2024 |
| OFT2025 Limited | Financial services | 2025 |
| OHM Solutions Limited | Professional & scientific | 2025 |
| OK UK Consulting Ltd | Professional & scientific | 2014 |
| Old Barn Malham Limited | Hospitality | 2016 |
| Old Ship Management Limited | Households | 2007 |
| Oldfield Electrical Supplies Limited | Wholesale & retail | 1958 |
| Oldfield Group (Skipton) Limited | Financial services | 2009 |
| Oldfield Home Controls Limited | Extraterritorial | 2004 |
| Oldfield Lighting Supplies Limited | Extraterritorial | 2000 |
| Oliver Smith Electrical Limited | Construction | 2013 |
| Oman Consult Ltd | Education | 2023 |
| Omanye Limited | Information & communication | 2010 |
| Omaxx SC Limited | Information & communication | 2024 |
| ON Holdings Ltd | Financial services | 2026 |
| ON the Spot Homecare Services Limited | Health & social care | 2014 |
| Only for MUM Ltd | Wholesale & retail | 2011 |
| Onwatch AI Ltd | Wholesale & retail | 2024 |
| Open Aire Collective CIC | Education | 2026 |
| Optical Technology Training Limited | Information & communication | 1989 |
| Optima Energy Services Ltd | Information & communication | 2004 |
| Optimal Building Services Ltd | Construction | 2013 |
| Optimal Wellbeing Limited | Health & social care | 2005 |
| Opus Architecture (Yorkshire) Ltd | Professional & scientific | 2024 |
| Orbit Staging Ltd | Construction | 2019 |
| Orbit Tandems Limited | Wholesale & retail | 2004 |
| Orchestrand & Velhampton Limited | Information & communication | 2003 |
| Origin Health Club Ltd | Arts & recreation | 2013 |
| Osprey Land and Property Ltd | Professional & scientific | 2025 |
| Otterbeck Distillery Limited | Manufacturing | 2019 |
| OUT & About Skipton Ltd | Other services | 2018 |