| Mustang Foods Limited | Hospitality | 2026 |
| Mustard Vintage Limited | Wholesale & retail | 2013 |
| Mutant Technology Limited | Professional & scientific | 2019 |
| MV Player Coaching Ltd | Education | 2025 |
| MVF Design Limited | Professional & scientific | 2015 |
| MVN Retail Ltd | Wholesale & retail | 2025 |
| MW CNC Engineering Limited | Manufacturing | 2015 |
| MWA Consultancy Limited | Professional & scientific | 2011 |
| My Clearwater Limited | Professional & scientific | 2018 |
| My Financial Pro Limited | Financial services | 2022 |
| My Perfect Brand Ltd | Wholesale & retail | 2021 |
| My Sport Times Limited | Arts & recreation | 2023 |
| MYE Refrigeration Ltd | Manufacturing | 2020 |
| Myrvo Technologies Ltd | Information & communication | 2026 |
| Mystery Shopper Experts Ltd | Administrative & support | 2022 |
| Myton Investments Ltd | Real estate | 2015 |
| N & I Treharne Ltd | Health & social care | 2022 |
| N & N Consultants Limited | Professional & scientific | 2018 |
| N Garner Crypto Limited | Other services | 2024 |
| N P K Food and Wine Limited | Wholesale & retail | 2024 |
| N V Morton Limited | Administrative & support | 2016 |
| N&N Parkash Group Ltd | Health & social care | 2025 |
| Nadia Boyarkina Ltd | Professional & scientific | 2015 |
| Nagi Housing Co Ltd | Real estate | 2026 |
| Nagra Studios Limited | Information & communication | 2008 |
| Naikart & Sopher King Ltd | Extraterritorial | 2021 |
| Nails Leamington Spa Ltd | Other services | 2024 |
| Nammonic Holding Ltd | Extraterritorial | 2009 |
| Nanas Foods Japan Limited | Hospitality | 2015 |
| Nappuccino Limited | Wholesale & retail | 2008 |
| NAS Invest UK Ltd | Financial services | 2026 |
| Nash DMG Ltd | Information & communication | 2013 |
| NAT & Lucy's Diner Limited | Hospitality | 2018 |
| NAT Coalson Ltd | Arts & recreation | 2012 |
| Natasha Baldwin Millinery Ltd | Manufacturing | 2009 |
| National Beef Association | Other services | 1998 |
| National Beef Services Limited | Administrative & support | 2010 |
| Natural Elixir (UK) LLP | | 2022 |
| Natural GAS Tubes Limited | Manufacturing | 2015 |
| Natural Nail and Spa Leamington Limited | Other services | 2026 |
| Naturally Baby Ltd | Wholesale & retail | 2016 |
| Naturopathycathy Limited | Health & social care | 2026 |
| Naughty Vegan Limited | Other services | 2020 |
| Navaro Ltd | Administrative & support | 2009 |
| Navedal Developments Limited | Real estate | 2018 |
| Navitas Biomass Limited | Water & waste | 2014 |
| Navitas Environmental Limited | Professional & scientific | 2007 |
| Navitas Estates Limited | Professional & scientific | 2013 |
| Nbkt Holdings Limited | Real estate | 2019 |
| NC Claims Investigation Limited | Administrative & support | 2012 |
| NCF Developments Limited | Construction | 2023 |
| NCL Wealth Partners Limited | Financial services | 2026 |
| NDS Homes Ltd | Real estate | 2021 |
| Neabil Waste Solutions Limited | Professional & scientific | 2017 |
| Neave Engineering Ltd | Professional & scientific | 2020 |
| Neighbourly Befriending CIC | Health & social care | 2025 |
| Neil Allison Digital Services Ltd | Information & communication | 2022 |
| Neil Ridgers Carpentry and Construction Ltd | Manufacturing | 2021 |
| Nelo Enterprise Ltd | Professional & scientific | 2019 |
| Neon Leamington Limited | Hospitality | 2020 |
| Nera Analytics Limited | Administrative & support | 2021 |
| Nerium Records Ltd | Information & communication | 2023 |
| Ness & BOO Limited | Information & communication | 2021 |
| Ness Healthcare Ltd | Health & social care | 2024 |
| NET Gain Ecology Limited | Professional & scientific | 2021 |
| NET Zero Energy Development Limited | Energy | 2020 |
| Network 401 Management Company Limited | Professional & scientific | 2014 |
| Network 421 Limited | Real estate | 2005 |
| Network 43 Management Limited | Real estate | 2003 |
| Neutrally Holdings Limited | Administrative & support | 2021 |
| Neuve Associates Ltd | Other services | 2017 |
| Nevaeh Air Conditioning Ltd | Construction | 2022 |
| Neville House Limited | Households | 1986 |
| New CB Properties Ltd | Real estate | 2024 |
| New Company 1845 Limited | Extraterritorial | 2010 |
| New Energy Initiatives Limited | Real estate | 2016 |
| New Future Creatives Ltd | Information & communication | 2023 |
| New Future Designs Ltd | Professional & scientific | 2012 |
| New Futures Nepal Limited | Education | 2011 |
| New Gods & Heroes Limited | Extraterritorial | 2010 |
| New Jubilee Fryers Ltd | Hospitality | 2026 |
| New Pastures Care Farm Ltd | Education | 2012 |
| New Street Brands UK Limited | Financial services | 2019 |
| Newark Alexander Limited | Wholesale & retail | 2024 |
| Newbold Allies Limited | Professional & scientific | 2019 |
| Newbold Electrical Installations Ltd | Construction | 2019 |
| Newbold Investments Limited | Real estate | 2011 |
| Newbold Lawn Tenants' Association Limited | Real estate | 2001 |
| Newman Capital (Carlton Hotel) Ltd | Construction | 2023 |
| Newman Capital (Projects) Ltd | Financial services | 2020 |
| Newman Capital (Regents Place) Ltd | Real estate | 2021 |
| Newman Projects (Stratford) Ltd | Construction | 2023 |
| Newman Rose (Isleham) Ltd | Construction | 2021 |
| Newman Schools Limited | Education | 2000 |
| Newroad Financial Limited | Other services | 2021 |
| News Plus Off-Licence UK Ltd | Wholesale & retail | 2019 |
| Nexon Management Ltd | Professional & scientific | 2019 |
| Next Level Motorsport Limited | Professional & scientific | 2017 |
| Next Level Sales Consultancy Limited | Administrative & support | 2021 |
| Nextgen Projects Limited | Construction | 2024 |