| Mycroft Services Ltd | Arts & recreation | 2026 |
| Myrtle Tree Innovations Ltd | Professional & scientific | 2021 |
| MZZ Transport Ltd | Transport & logistics | 2026 |
| N & a Wilson Brothers Ltd | Construction | 2021 |
| N & N Drivers Limited | Transport & logistics | 2017 |
| N and T (Cambs) Limited | Administrative & support | 2016 |
| N C Solutions (Lincs) Ltd | Agriculture & fishing | 2015 |
| N Young Property Maintenance Ltd | Construction | 2011 |
| N Young Tree Services Ltd | Administrative & support | 2015 |
| N. S. Property Ltd | Real estate | 2016 |
| Naan Wala Pizza & Grill Ltd | Hospitality | 2020 |
| Nagarpur Company Ltd | Hospitality | 2020 |
| Nali Perot Ltd | Administrative & support | 2025 |
| NAM Trans Ltd | Transport & logistics | 2021 |
| Nanogo Detailing Ltd | Wholesale & retail | 2019 |
| Narvydas&Krasn Ltd | Transport & logistics | 2021 |
| Natanlena Ltd | Transport & logistics | 2019 |
| Nathan Salters Property Holdings Limited | Real estate | 2023 |
| Nathu Limited | Hospitality | 1987 |
| Nation's Coaching Limited | Health & social care | 2024 |
| National Events Ltd | Administrative & support | 2015 |
| Nationwide Caravans (Midlands) Ltd | Administrative & support | 2026 |
| Nationwide Park Home Repairs Ltd | Manufacturing | 2026 |
| Nationwide Tree and Gardening Services Ltd | Administrative & support | 2015 |
| Nationwide Tree Services (Yorkshire) Ltd | Administrative & support | 2022 |
| Naturally Aspirated Limited | Information & communication | 2023 |
| Natures Own Landscaping and Tree Services Ltd | Administrative & support | 2023 |
| Naughty Little Mouse Ltd | Arts & recreation | 2024 |
| Naylor & Naylor Ltd | Financial services | 2022 |
| Naylor Family Holding Limited | Administrative & support | 2010 |
| Naylor Flowers Limited | Agriculture & fishing | 2015 |
| Naylor Nutrition Group Limited | Manufacturing | 2021 |
| Naylor Nutrition Holdings Limited | Financial services | 2026 |
| Naylor Nutrition UK Limited | Manufacturing | 2021 |
| Naylor Produce Limited | Administrative & support | 2010 |
| NB Engines Ltd | Extraterritorial | 2018 |
| Ncad Engineering Limited | Information & communication | 1994 |
| NCS (Spalding) Limited | Administrative & support | 2025 |
| NDP Landscaping & Civils Ltd | Administrative & support | 2026 |
| Neame LEA Nursery Limited | Administrative & support | 2010 |
| Nedas Trans Ltd | Transport & logistics | 2019 |
| Neil Brown Engineering Developments Limited | Manufacturing | 2008 |
| Neil Wade Stoves Limited | Wholesale & retail | 2013 |
| Nene Potatoes Limited | Wholesale & retail | 2002 |
| Nene Store Ltd | Wholesale & retail | 2020 |
| Nene Transport (Lincs) Limited | Transport & logistics | 2005 |
| Neon Swim Ltd | Wholesale & retail | 2023 |
| Nerijus Ltd | Transport & logistics | 2017 |
| NET Placement Ltd | Administrative & support | 2022 |
| Netisp Limited | Information & communication | 2013 |
| Neurodiversity Challenge Limited | Health & social care | 2022 |
| New Bathrooms and Kitchens Limited | Construction | 2019 |
| New Drives ( Lincoln ) Ltd | Construction | 2023 |
| New Kebab Takeaway Ltd | Hospitality | 2025 |
| New Look Building Services (North) Ltd | Construction | 2020 |
| New Look Roofing South Ltd | Construction | 2025 |
| New Pastures Developments Ltd | Construction | 2021 |
| New Rail Consultants Ltd | Professional & scientific | 2026 |
| New Vision Home Improvements Ltd | Construction | 2024 |
| Newbrook Engineering Company Limited (the) | Manufacturing | 1970 |
| Newhurst Dlff Holdings Limited | Real estate | 2021 |
| Newlavora Ltd | Wholesale & retail | 2025 |
| Newman Engineering Limited | Wholesale & retail | 2022 |
| Newman Scaffolding Services Ltd | Construction | 2024 |
| Newquaymummy Ltd | Arts & recreation | 2024 |
| Newthorpe Solutions Limited | Professional & scientific | 2010 |
| Newton & Sons Services Ltd | Wholesale & retail | 2024 |
| Newton Farm Services Ltd | Manufacturing | 2018 |
| Newton Investments Limited | Real estate | 2018 |
| Nexgen Property Care Limited | Real estate | 2023 |
| Nexloom Limited | Information & communication | 2025 |
| Next Step Assessments Ltd | Education | 2026 |
| Next Trend Marketing Limited | Extraterritorial | 2024 |
| Nextgen Lifestyle Ltd | Arts & recreation | 2025 |
| Nexus Facade Design & Consultancy Ltd | Professional & scientific | 2015 |
| Nexvora Tech Limited | Information & communication | 2026 |
| NF Commercial Ltd | Real estate | 2008 |
| NF Investments (Properties) Ltd | Construction | 2020 |
| NF Lettings Ltd | Real estate | 2020 |
| NF Property Group Ltd | Real estate | 2011 |
| NG Property Services Lincs Ltd | Construction | 2018 |
| NGD92 Trans Limited | Transport & logistics | 2015 |
| NHA Global Ltd | Wholesale & retail | 2018 |
| Nhyira Limited | Health & social care | 2018 |
| NI Transport Ltd | Transport & logistics | 2017 |
| Niamh Limited | Real estate | 2000 |
| Nicci Marzec Associates Ltd | Professional & scientific | 2013 |
| Nick Dove Specialist Services Limited | Wholesale & retail | 1996 |
| Nick Wilson Heating and Plumbing Limited | Construction | 2007 |
| Nico Transport Ltd | Transport & logistics | 2025 |
| Nicola Mcnamara Limited | Administrative & support | 2008 |
| Nigel Cowlen Engineering Ltd | Professional & scientific | 2005 |
| Nigel Graham Limited | Transport & logistics | 2017 |
| Niko LUC Ltd | Transport & logistics | 2024 |
| Nini Organics Limited | Other services | 2018 |
| Nipa Property Ltd | Construction | 2023 |
| Nisa Supermarkets Ltd | Wholesale & retail | 2026 |
| Njbb Limited | Health & social care | 2009 |
| NJN Transport Ltd | Transport & logistics | 2022 |
| NJO Services Ltd | Real estate | 2024 |