| Northern Heat Link Renewables Ltd | Wholesale & retail | 2009 |
| Northern Holiday Lets Limited | Real estate | 2024 |
| Northern Homesphere Ltd | Professional & scientific | 2026 |
| Northern Hospitality CL Limited | Manufacturing | 2023 |
| Northern Hospitality EP Limited | Real estate | 2023 |
| Northern Hospitality Projects Ltd | Hospitality | 2023 |
| Northern Hospitality RT Limited | Hospitality | 2025 |
| Northern House Atelier Specialist Decorative Finishes Ltd | Construction | 2026 |
| Northern Hub Limited | Transport & logistics | 2012 |
| Northern Imposters Productions Limited | Information & communication | 2020 |
| Northern Impression Ltd | Manufacturing | 2014 |
| Northern Invader Limited | Extraterritorial | 1996 |
| Northern Landscapes Ltd | Administrative & support | 2023 |
| Northern Legal Consultants Limited | Professional & scientific | 2018 |
| Northern Light Homes Limited | Real estate | 2020 |
| Northern Light Lifescience Ltd | Professional & scientific | 2019 |
| Northern Lights Hockey Club Ltd | Arts & recreation | 2022 |
| Northern Lights Installation Ltd | Professional & scientific | 2025 |
| Northern Lion Security Ltd | Administrative & support | 2026 |
| Northern Longevity Collective Ltd | Other services | 2026 |
| Northern Mechanics Ltd | Wholesale & retail | 2025 |
| Northern Medical Clinics Limited | Health & social care | 2010 |
| Northern Monk Brewing Co. Ltd | Manufacturing | 2013 |
| Northern Multi Trade Ltd | Construction | 2023 |
| Northern Music Solutions Ltd | Administrative & support | 2019 |
| Northern Notarial Services Limited | Professional & scientific | 2022 |
| Northern Office Solutions Ltd | Administrative & support | 2021 |
| Northern Padel Ltd | Arts & recreation | 2025 |
| Northern Painting Contractors Limited | Wholesale & retail | 1943 |
| Northern Parking Management Limited | Administrative & support | 2008 |
| Northern Pastry Ltd | Manufacturing | 2025 |
| Northern Peptides Limited | Health & social care | 2026 |
| Northern Pilates Limited | Arts & recreation | 2025 |
| Northern Plumbers Limited | Construction | 2021 |
| Northern Properties (Scarborough) Limited | Real estate | 2001 |
| Northern Properties (UK) Limited | Real estate | 1999 |
| Northern Property Partners Limited | Real estate | 2019 |
| Northern Radiators (Bradford) Limited | Wholesale & retail | 1954 |
| Northern Radiators Limited | Other services | 1920 |
| Northern Reactive Maintenance Limited | Construction | 2021 |
| Northern Refine Ltd | Water & waste | 2019 |
| Northern Residencies Limited | Real estate | 2023 |
| Northern Restoration Limited | Administrative & support | 2014 |
| Northern Roofing Limited | Construction | 2017 |
| Northern Roofing Supplies (Leeds) Ltd | Wholesale & retail | 2021 |
| Northern Rooms Ltd | Real estate | 2022 |
| Northern Roots Gardening Services Ltd | Administrative & support | 2025 |
| Northern Rose Campervan Conversions Limited | Manufacturing | 2017 |
| Northern Sealants Limited | Construction | 2010 |
| Northern Shopfronts & Shutters Limited | Other services | 2018 |
| Northern Snooker Centre (Leeds) Limited | Hospitality | 1973 |
| Northern Social LAB Ltd | Professional & scientific | 2026 |
| Northern Specialist Psychotherapy Services Ltd | Health & social care | 2026 |
| Northern Star Accounts Ltd | Professional & scientific | 2025 |
| Northern Star Trustees Limited | Professional & scientific | 2021 |
| Northern Storage Limited | Administrative & support | 2003 |
| Northern Tech Hub Ltd | Information & communication | 2025 |
| Northern Telecom TP Limited | Information & communication | 2022 |
| Northern Thing Street Sales Ltd | Wholesale & retail | 2024 |
| Northern Touch Design Ltd | Professional & scientific | 2018 |
| Northern Traders (Leeds) Ltd | Manufacturing | 2008 |
| Northern Transport Planning Limited | Professional & scientific | 2005 |
| Northern UK Properties Limited Partnership | | 2009 |
| Northern Valley Group Ltd | Administrative & support | 2026 |
| Northern Zing Limited | Construction | 2024 |
| Northerndimension Limited | Professional & scientific | 2018 |
| Northernpd. Ltd | Energy | 2017 |
| Northfield Aluminium Limited | Manufacturing | 1982 |
| Northfield Commercial Properties Ltd | Real estate | 2025 |
| Northfield Lane (Management) Limited | Real estate | 2002 |
| Northfield Properties Limited | Real estate | 2019 |
| Northfield Terrace Ltd | Real estate | 2021 |
| Northfields Medical Limited | Health & social care | 2021 |
| Northfit Ltd | Arts & recreation | 2026 |
| Northfold Consulting Limited | Professional & scientific | 2026 |
| Northforge Ltd | Professional & scientific | 2011 |
| Northgate House RTM Company Limited | Households | 2023 |
| Northgate Lighting Group Ltd | Wholesale & retail | 2019 |
| Northgate Lighting Limited | Manufacturing | 2006 |
| Northgate PUB Management Ltd | Hospitality | 2020 |
| Northlight Arts Centre Community Interest Company | Education | 2023 |
| Northone Legal Ltd | Professional & scientific | 2026 |
| Northone Solicitors (Leeds) Limited | Professional & scientific | 2013 |
| Northpoint Property Investments Ltd | Real estate | 2025 |
| Northpoint Wellbeing Limited | Health & social care | 1996 |
| NORTHPOINT360 Property Marketing Ltd | Real estate | 2024 |
| Northprop Investments Ltd | Real estate | 2020 |
| Northrise Developments Ltd | Real estate | 2024 |
| Northside Business Park Limited | Other services | 1988 |
| Northside Consulting Limited | Information & communication | 2013 |
| Northside Development (UK) Limited | Real estate | 2005 |
| Northside Training Ltd | Education | 2020 |
| Northstar FI Ltd | Extraterritorial | 2021 |
| Northstar Global Express Ltd | Transport & logistics | 2019 |
| Northstar Interactive Limited | Information & communication | 2026 |
| Northstar Scientific Ltd | Administrative & support | 2000 |
| Northstarwin Limited | Information & communication | 2025 |
| Northstead Estate Limited | Households | 2026 |
| Northstead Ltd | Professional & scientific | 2026 |
| Northstone Building Services Ltd | Construction | 2026 |