| Newday Property Holdings Ltd | Real estate | 2025 |
| Newlay Roofing Limited | Construction | 2023 |
| Nexsafe Ltd | Construction | 2023 |
| Next City Builders Ltd | Construction | 2025 |
| Next Level Brickwork Ltd | Construction | 2026 |
| Next Move Investments Ltd | Real estate | 2024 |
| Next Step Nutrition Ltd | Other services | 2019 |
| Nextgencoding Ltd | Information & communication | 2025 |
| Nexus HR Limited | Administrative & support | 2022 |
| Nexus Integrations Ltd | Information & communication | 2026 |
| Nexus Vehicle Holdings Limited | Financial services | 2007 |
| Nexus Vehicle Management Ltd. | Administrative & support | 1999 |
| Nexus VRM Limited | Extraterritorial | 1989 |
| NF Healthcare Limited | Health & social care | 2025 |
| NG Contractors (Leeds) Ltd | Construction | 2023 |
| NG20 Technical Limited | Construction | 2010 |
| Niche Medical Supplies Ltd | Wholesale & retail | 2020 |
| Nick Habib Ltd | Information & communication | 2017 |
| Nick Kemp Training Limited | Education | 2009 |
| Nine Foot Tall Limited | Information & communication | 2025 |
| Nirbhao Limited | Administrative & support | 2025 |
| Nirmal Razai Mart Company Limited | Real estate | 1978 |
| NJL Trading Ltd | Professional & scientific | 2015 |
| Nmsc Ltd | Professional & scientific | 2020 |
| NO Boundary Ever Ltd | Arts & recreation | 2023 |
| NO LYE It's Soap Limited | Manufacturing | 2023 |
| NO2 Lcop Ltd | Construction | 2026 |
| Noble Properties Leeds Ltd | Real estate | 2023 |
| Nobleray Limited | Wholesale & retail | 2020 |
| Noise to Coherence CIC | Education | 2026 |
| Nord OST Ltd | Construction | 2024 |
| Norman Bar Limited | Real estate | 1999 |
| North 54 Building Services Ltd | Construction | 2023 |
| North K9 Ltd | Other services | 2012 |
| North View Court (Stanningley) Management Company Limited | Households | 2019 |
| Northcliffe Environmental Enterprises Team (N.E.E.T) | Health & social care | 2006 |
| Northern Eco and Renewables Ltd | Professional & scientific | 2025 |
| Northwood Close Management Company (Pudsey) Limited | Households | 1988 |
| Norton Webb Limited | Education | 2003 |
| Norwood Engineers (Pudsey) Limited | Manufacturing | 2002 |
| Nova School Limited | Professional & scientific | 2025 |
| NR Repairs and Maintenance Limited | Construction | 2023 |
| Nukutus Limited | Health & social care | 2018 |
| Nure Beauty Ltd | Wholesale & retail | 2023 |
| NUT JOB Ltd | Wholesale & retail | 2008 |
| Nutribytes Ltd | Education | 2020 |
| Nutward Properties Limited | Real estate | 2016 |
| Nyachi's Ltd | Health & social care | 2019 |
| Oakwood Roofing Solutions Ltd | Construction | 2019 |
| Ocean City Games Ltd | Information & communication | 2020 |
| Octa LAB Ltd | Information & communication | 2025 |
| Octane Construction Limited | Construction | 2016 |
| Odessy Consultancy Ltd | Information & communication | 2014 |
| OH Hello Pottery Studio Ltd | Arts & recreation | 2021 |
| OH, Hello Pottery Cafe Ltd | Hospitality | 2024 |
| OKE Health Ltd | Wholesale & retail | 2025 |
| Old Mill Yeadon Ltd | Real estate | 2025 |
| Olde Booths Limited | Hospitality | 2025 |
| Oleana Limited | Information & communication | 2006 |
| Olive and Jules Limited | Wholesale & retail | 2026 |
| Olivet Property Limited | Real estate | 2018 |
| Olivia Kahn Ltd | Administrative & support | 2017 |
| Oltia Books Limited | Administrative & support | 2010 |
| Omega AV Ltd | Manufacturing | 2024 |
| Omega Stone Limited | Construction | 2011 |
| One Call Windscreens Limited | Wholesale & retail | 2022 |
| One Interchange Ltd | Real estate | 2022 |
| Oneshotcatering Ltd | Hospitality | 2025 |
| Onit Installations Ltd | Construction | 2023 |
| Opal North-West Ltd | Education | 2024 |
| Open Arms Residential Care Ltd | Health & social care | 2026 |
| Optadent Solutions Limited | Manufacturing | 2018 |
| Optica Fire & Security Limited | Administrative & support | 2002 |
| Optivu Eyecare (Farsley) Ltd | Wholesale & retail | 2020 |
| Orange Cloud Software Ltd | Manufacturing | 2012 |
| ORANGE21 Ltd | Administrative & support | 2019 |
| ORANGE21UK Ltd | Administrative & support | 2023 |
| Origatani Ltd | Households | 2019 |
| Orme Investments Ltd | Real estate | 2020 |
| Oscars Barbers Pudsey Ltd | Other services | 2026 |
| Oughta Ltd | Professional & scientific | 2022 |
| Outdoor Classrooms Limited | Manufacturing | 2012 |
| Outer RIM Cards Ltd | Wholesale & retail | 2026 |
| Over the Top Media Ltd | Information & communication | 2024 |
| OWL Associates Ltd. | Professional & scientific | 2024 |
| Owlcotes Carwash Ltd | Other services | 2022 |
| Owlcotes Multi Academy Trust | Education | 2018 |
| P B Technical Ltd | Wholesale & retail | 2021 |
| P H D Electrical Services (Leeds) Limited | Construction | 2011 |
| P H Plasterers Yorkshire Ltd | Construction | 2026 |
| P R Carr Windows Limited | Construction | 2003 |
| P.G.K. Security (Bradford) Limited | Administrative & support | 1980 |
| Palace Studios Management Limited | Real estate | 2015 |
| Palmer Horticultural Holdings Limited | Financial services | 2026 |
| Palmer Landscapes Limited | Administrative & support | 1970 |
| Palmer Nurseries Limited | Wholesale & retail | 1982 |
| Panarabia Ltd | Information & communication | 2019 |
| Pankhurst Productions Ltd | Arts & recreation | 2019 |
| Panshu & Mishu Ltd | Information & communication | 2021 |
| Panther EV Limited Limited | Wholesale & retail | 2025 |