| Mlps Engineering Ltd | Manufacturing | 2014 |
| MMA Trans Ltd | Transport & logistics | 2019 |
| Mobile Catering & Amusements Ltd | Hospitality | 2018 |
| Mobile Catering Events Ltd | Hospitality | 2023 |
| Moira PO Limited | Wholesale & retail | 2011 |
| Moira Sports and Social Club Limited | Arts & recreation | 1999 |
| Momentum GCH Limited | Administrative & support | 2021 |
| Momentum VPA Limited | Administrative & support | 2008 |
| Montgomery Place Residents Management Company Limited | Households | 2015 |
| Moodoo Limited | Wholesale & retail | 2026 |
| Moon Martial Arts Ltd | Arts & recreation | 2023 |
| Moonfall Properties Ltd | Real estate | 2024 |
| Moonshine Derbyshire Ltd | Wholesale & retail | 2023 |
| Moorcroft Management Company Limited | Households | 2016 |
| Moore Building Group Ltd | Construction | 2023 |
| Moore Recycling Limited | Water & waste | 2002 |
| Moore's Carpentry Limited | Wholesale & retail | 2007 |
| Moorland View (Meltham) Management Company Limited | Households | 2017 |
| Moorlands (Pickering) Management Company Limited | Households | 2011 |
| Moose Drives and Controls Limited | Professional & scientific | 2025 |
| More Than Interiors Limited | Construction | 2006 |
| Morgan Maxwell Ltd | Transport & logistics | 2008 |
| Morlea Home Improvements Ltd | Construction | 2009 |
| Mornshill Limited | Real estate | 1986 |
| Mossla Property Ltd | Real estate | 2022 |
| Motiif Ltd | Wholesale & retail | 2026 |
| Motion & Mind OT Limited | Health & social care | 2025 |
| Mototwelve Ltd | Wholesale & retail | 2018 |
| Moundgrey Limited | Other services | 1981 |
| Movemymotor Ltd | Transport & logistics | 2026 |
| Movesmart Transport Ltd | Transport & logistics | 2023 |
| MR Sweeps Ltd | Administrative & support | 2018 |
| MRA Security Consultant’S Ltd | Administrative & support | 2025 |
| MRF Group Limited | Transport & logistics | 2019 |
| MRH Couriers Ltd | Transport & logistics | 2025 |
| MSA Consultancy Services Ltd | Administrative & support | 2019 |
| MSL Food Limited | Hospitality | 2023 |
| MTD Engineering Services Ltd | Manufacturing | 2017 |
| Mtmas Limited | Manufacturing | 1977 |
| Mudge Media Ltd | Information & communication | 2026 |
| Murcia Capital Group Limited | Financial services | 2026 |
| Mushroom Complex Ltd | Agriculture & fishing | 2024 |
| MV Interim Ltd | Other services | 2013 |
| My Life Bespoke Ltd | Construction | 2025 |
| My Life Midlands Ltd | Construction | 2021 |
| My Other Car IS a Limited | Financial services | 2015 |
| Mya's Beauty Room Ltd | Other services | 2024 |
| N & F Roobottom Ltd | Agriculture & fishing | 2012 |
| N P Electrics Ltd | Construction | 2010 |
| N4P Finance Solutions Ltd | Professional & scientific | 2026 |
| Nant Seren Management Company Limited | Households | 2015 |
| Natalie Simpson Coaching Limited | Other services | 2022 |
| National Forest Enterprises Limited | Arts & recreation | 1998 |
| Natural Agency Limited | Information & communication | 2022 |
| Naturally Pawfect Midlands Ltd | Wholesale & retail | 2025 |
| Navam & Co Ltd | Wholesale & retail | 2022 |
| Neelima Yannamani Limited | Administrative & support | 2022 |
| Neil Adams Mechanical Services Limited | Mining & quarrying | 2009 |
| Nenesrec Ltd | Hospitality | 2022 |
| Neon Narrative Limited | Administrative & support | 2019 |
| Neptune Fine Art Limited | Wholesale & retail | 2004 |
| Netenic Ltd | Extraterritorial | 2019 |
| Netheroak Investments Limited | Professional & scientific | 1972 |
| Netistrar Limited | Information & communication | 2013 |
| Netzero Spaces Ltd | Manufacturing | 2023 |
| Nevic Ltd | Real estate | 2025 |
| New Estate Developments Limited | Financial services | 2020 |
| New Mile Consulting Limited | Professional & scientific | 2015 |
| New Millinnum Fish Bar Ltd | Hospitality | 2018 |
| New Swad Finest Bangladeshi Cuisine Ltd | Hospitality | 2024 |
| New World Newhall Ltd | Hospitality | 2024 |
| Newhall Balti Limited | Hospitality | 2025 |
| Newhall Garage Limited | Wholesale & retail | 2020 |
| Newton Manor (Newton Regis) Management Company Limited | Households | 2022 |
| Nextgen Homes 2026 Ltd | Real estate | 2025 |
| Nexum Flow Solutions Ltd | Information & communication | 2021 |
| Nexum Flow Systems Ltd | Construction | 2021 |
| Nexum Ventures Ltd | Professional & scientific | 2024 |
| Nexus 13 Limited | Professional & scientific | 2026 |
| Nfor Consulting Ltd | Professional & scientific | 2020 |
| Ngak Consulting Limited | Professional & scientific | 2025 |
| NIC Haulage Ltd | Transport & logistics | 2026 |
| Niche UK Limited | Manufacturing | 2008 |
| Nick Fearn Electrical Ltd | Construction | 2015 |
| Nick Gwilliam Electrical Ltd | Construction | 2013 |
| Nielsen Chemicals Limited | Extraterritorial | 2006 |
| Nimrat Private Ltd | Transport & logistics | 2018 |
| Niwa Nishikigoi Ltd | Wholesale & retail | 2024 |
| NJ Evans Services Ltd | Real estate | 2022 |
| NJO Drainage Consultants Ltd | Professional & scientific | 2020 |
| NO Human IS Online Ltd | Wholesale & retail | 2021 |
| NO Nonsense GAS Water and Power Ltd | Construction | 2020 |
| NO1HOMESUK Limited | Real estate | 2020 |
| NO1ROOMS Limited | Real estate | 2018 |
| Noble Vagabond Limited | Administrative & support | 2024 |
| Node Additive MFG Ltd | Manufacturing | 2023 |
| Node Support Systems Ltd | Administrative & support | 2009 |
| Nomad Tattoo and Retail Limited | Other services | 2017 |
| Norah Skin Ltd | Wholesale & retail | 2026 |
| Norris Joinery Ltd | Manufacturing | 2025 |