| MR Flyer Ltd | Other services | 2020 |
| MRM Distribution Ltd | Wholesale & retail | 2025 |
| MTC Healthcare Ltd | Health & social care | 2023 |
| MTG Holdings Limited | Financial services | 2016 |
| MTS Maxwell Technical Services Limited | Administrative & support | 2016 |
| Music on the Moor Ltd | Arts & recreation | 2025 |
| Mustang Autos Limited | Wholesale & retail | 2023 |
| MV Osteopathic-Practice Ltd | Health & social care | 2009 |
| My Credit Control Limited | Professional & scientific | 2014 |
| My Finance Team Limited | Professional & scientific | 2013 |
| My Furniture World UK Limited | Wholesale & retail | 2025 |
| My Mortgage Hub Limited | Financial services | 2016 |
| Myskindesign Limited | Health & social care | 2009 |
| Naomi Mary Studio Ltd | Professional & scientific | 2025 |
| Naturesnooktreasures Limited | Manufacturing | 2021 |
| Neat Investments Ltd | Construction | 2023 |
| Neretva Health Ltd | Health & social care | 2021 |
| New Dawn Holdings (2021) Limited | Financial services | 2021 |
| New Great Wall Restaurant Ltd | Hospitality | 2026 |
| New Taverns Ltd | Hospitality | 2024 |
| Newrose Dog Training Ltd | Other services | 2022 |
| Nexus Workforce Ltd | Administrative & support | 2000 |
| Neyorozy Ltd | Wholesale & retail | 2026 |
| Nibsy Plant Hire Ltd | Administrative & support | 2018 |
| Nichols Property Management Limited | Real estate | 2020 |
| Nigel Porritt Financial Planning Ltd | Financial services | 2024 |
| Nightly Comfort Beds Ltd | Manufacturing | 2026 |
| Nini Convenience Store Ltd | Wholesale & retail | 2022 |
| Nixon D&B Limited | Construction | 2022 |
| Nixon’S Digger Hire Ltd | Construction | 2025 |
| NJB Fabrications Limited | Manufacturing | 2017 |
| NJB Finance Limited | Information & communication | 2015 |
| NO Entry Fire and Security Limited | Administrative & support | 2012 |
| NO Entry Pest Control Ltd | Administrative & support | 2022 |
| NO Entry Site Security Ltd | Administrative & support | 2022 |
| Nobu Aesthetics Ltd | Other services | 2024 |
| Norcore Services Ltd | Construction | 2026 |
| Nord Electrical Ltd | Construction | 2026 |
| North Frequency Ltd | Information & communication | 2025 |
| North Stone Data Ltd | Professional & scientific | 2026 |
| Northacre Land Management Ltd. | Real estate | 2019 |
| Northern Fasteners Ltd | Manufacturing | 2024 |
| Northern Getaways Ltd | Real estate | 2025 |
| Norths SK Ltd | Hospitality | 2014 |
| Northstone Capital Ltd | Financial services | 2026 |
| Norwood Machine Tools Limited | Wholesale & retail | 1983 |
| Norwood Products & Services Limited | Wholesale & retail | 2009 |
| Norwood Solutions Limited | Real estate | 2007 |
| Nova Bistro Ltd | Hospitality | 2026 |
| Nova GAS & Power Ltd | Energy | 2025 |
| Nova Pubs Ltd | Professional & scientific | 2025 |
| Novexio Ltd | Wholesale & retail | 2026 |
| Novious Building Performance Ltd | Construction | 2023 |
| Novious Property Group Ltd | Real estate | 2025 |
| NR Legacy Properties Ltd | Real estate | 2022 |
| Nutridrips Limited | Health & social care | 2019 |
| Nvm-Uk Limited | Wholesale & retail | 2015 |
| O & C Property Management Limited | Real estate | 2018 |
| Oils Well Limited | Wholesale & retail | 1999 |
| Oiltech Automation Limited | Professional & scientific | 2017 |
| Oiltech Group Limited | Professional & scientific | 1987 |
| OJR Real Estate Limited | Real estate | 2023 |
| OJS Consulting Engineers Ltd | Professional & scientific | 2024 |
| Olives Green Ltd | Hospitality | 2026 |
| Olowek & SON Ltd | Construction | 2023 |
| OMY ETC Ltd | Wholesale & retail | 2024 |
| One Bright DOT Ltd | Information & communication | 2016 |
| ONE9 Traffic Management Limited | Public administration | 2025 |
| OPTIMAIZE360 Ltd | Information & communication | 2025 |
| Optimeyes (Huddersfield) Ltd | Wholesale & retail | 2010 |
| Optivu Eyecare (Brighouse) Ltd | Wholesale & retail | 2019 |
| Orchard Properties (Yorkshire) Ltd | Real estate | 2019 |
| Orchardrise Limited | Real estate | 1998 |
| Orchid & Co Property Ltd | Construction | 2024 |
| Orox Limited | Manufacturing | 2024 |
| Otrr Consulting Ltd | Professional & scientific | 2025 |
| Otsvo Events Hire Ltd | Administrative & support | 2025 |
| Overlook Audio Ltd | Information & communication | 2023 |
| Overvue Ltd | Professional & scientific | 2022 |
| OWL Access Ltd | Construction | 2025 |
| Owram Estates Limited | Real estate | 1946 |
| P.Leone Home Renovation Ltd | Construction | 2019 |
| PAA Solutions Limited | Professional & scientific | 2008 |
| Paints & Lacquers (Halifax) Limited | Wholesale & retail | 2022 |
| PAJ Premier Care Ltd | Health & social care | 2010 |
| PAK Madina Ltd | Hospitality | 2025 |
| Palermo Mancunia Consulting Limited | Professional & scientific | 2016 |
| PAN Best Company Ltd | Health & social care | 2019 |
| Panache Dance & Cheer Academy Ltd | Arts & recreation | 2025 |
| Panda Media Productions Limited | Information & communication | 2008 |
| Pangeia Proxima Limited | Wholesale & retail | 2022 |
| Panther Security CPE Limited | Administrative & support | 2009 |
| Paradigms Reinvented Ltd | Professional & scientific | 2014 |
| Paranormal Investigations Limited | Professional & scientific | 2018 |
| Park ROW Hair & Beauty Ltd | Wholesale & retail | 2011 |
| Park ROW Partners Limited | Agriculture & fishing | 2009 |
| Parking Ventilation Equipment Ltd | Construction | 2004 |
| Parkside Motors (Brighouse) Ltd | Wholesale & retail | 2021 |
| Parsonage Lane Properties Limited | Administrative & support | 2008 |
| Pathan Energy Solutions Ltd | Wholesale & retail | 2024 |