| MPT8 Limited | Hospitality | 2017 |
| MR Designs Stafford Limited | Manufacturing | 2017 |
| MR Michael Lane Limited | Wholesale & retail | 2012 |
| MR Print IT Stafford Ltd | Manufacturing | 2013 |
| MR Simms Olde Sweet Shoppe Online Limited | Wholesale & retail | 2011 |
| MR Simms Property Limited | Real estate | 2026 |
| MR. Simms Olde Sweet Shoppe Limited | Manufacturing | 2006 |
| MRB Consultants Limited | Professional & scientific | 2007 |
| MRB Nationwide Limited | Transport & logistics | 2003 |
| MRC Offshore Services Ltd | Construction | 2024 |
| Mre&Surplus Ltd | Wholesale & retail | 2025 |
| Mrrjwdon Limited | Wholesale & retail | 2025 |
| MRT Automotive Limited | Wholesale & retail | 2023 |
| MRT Ground and Build Ltd | Construction | 2025 |
| MS Bars Ltd | Hospitality | 2025 |
| MS Karate Ltd | Education | 2010 |
| MSB Structural Engineering Limited | Professional & scientific | 2011 |
| MSD Valve Limited | Extraterritorial | 2022 |
| Msemi Company Limited | Manufacturing | 2022 |
| Msfxzl Software Technology Ltd | Wholesale & retail | 2021 |
| MSK Cars Limited | Administrative & support | 2019 |
| Msmz Ltd | Health & social care | 2023 |
| Msrf Ltd | Financial services | 2023 |
| MST Hold Company Ltd | Extraterritorial | 2026 |
| MTB Consulting Ltd | Construction | 2025 |
| MTB Services Limited | Construction | 2019 |
| MTU Developments Ltd | Construction | 2026 |
| Muchen International Technology Co., Ltd | Wholesale & retail | 2025 |
| Muddasir Builder Ltd | Construction | 2024 |
| Muir Farming Limited | Agriculture & fishing | 2011 |
| Muirs Motors Ltd | Wholesale & retail | 2018 |
| Mulberry House Care Homes Limited | Health & social care | 2002 |
| Multiplier Frameworks Ltd | Information & communication | 2026 |
| Mumford Pension Services Limited | Professional & scientific | 2013 |
| Mumian Ltd | Wholesale & retail | 2021 |
| Music IS the Answer Ltd | Administrative & support | 2026 |
| Musudah Asset Management Limited | Real estate | 2019 |
| Muxil Limited | Wholesale & retail | 2025 |
| Muzzi Moto Limited | Wholesale & retail | 2011 |
| Mvenianakis Limited | Health & social care | 2021 |
| MWM Inns Ltd | Hospitality | 2018 |
| Mwmeb Ltd | Hospitality | 2020 |
| MWS Auto Limited | Administrative & support | 2024 |
| My Baby and I Scan Ltd | Professional & scientific | 2024 |
| My New Wheels Ltd | Wholesale & retail | 2020 |
| My Penelope Limited | Information & communication | 2025 |
| My SUB Ltd | Hospitality | 2013 |
| Mychronomy Limited | Information & communication | 2019 |
| Myconsultantuk Ltd | Health & social care | 2026 |
| Myk-J Home Healthcare Limited | Administrative & support | 2013 |
| Mykala Holford Hair Ltd | Other services | 2026 |
| Mylascents Ltd | Manufacturing | 2022 |
| Mylastwill Limited | Professional & scientific | 2018 |
| Mypro Builder Ltd | Construction | 2021 |
| Myrtle Grove Property Group Ltd | Real estate | 2025 |
| Mytharia Ltd | Information & communication | 2026 |
| Mytrainticket.Co.Uk Limited | Administrative & support | 2013 |
| Mytrax Ltd | Information & communication | 2026 |
| N and J Terry Property Limited | Real estate | 2019 |
| N Sheikh Ltd | Hospitality | 2023 |
| N Wootton Ltd | Public administration | 2021 |
| N.A Shoes Limited | Wholesale & retail | 2020 |
| N.A.M. Information Systems Limited | Information & communication | 1996 |
| N.E. Services (Cannock) Limited | Construction | 2002 |
| N.S.D Highways Ltd | Construction | 2015 |
| N.T. Funding Limited | Real estate | 1997 |
| N25 Bar and Coffee Co., Ltd | Wholesale & retail | 2025 |
| NA Belcher Ltd | Hospitality | 2025 |
| Nabil Creative for Import and Export Limited | Construction | 2026 |
| Naboetx Limited | Wholesale & retail | 2025 |
| Nadoram Investment Group Ltd | Real estate | 2025 |
| Nads Professional Services Limited | Professional & scientific | 2023 |
| Naerexina Ltd | Wholesale & retail | 2025 |
| Nafeier Import and Export Co., Ltd | Wholesale & retail | 2024 |
| Nail Room Stafford Ltd | Other services | 2018 |
| Namio Properties Ltd | Real estate | 2020 |
| Nana Home Group Co., Ltd. | Manufacturing | 2025 |
| Nancy Import and Export Co., Ltd | Manufacturing | 2024 |
| Nanjing Columbison International Trading Co., Ltd | Wholesale & retail | 2023 |
| Nanobot Solutions Ltd | Information & communication | 2020 |
| Nanshan Ltd | Professional & scientific | 2020 |
| NAT Cargo Enterprises Ltd | Transport & logistics | 2025 |
| NAT Enterprises Ltd | Transport & logistics | 2018 |
| NAT Holdings Ltd | Transport & logistics | 2024 |
| NAT Transport & Logistics Ltd | Transport & logistics | 2025 |
| Nathan Oakmont Limited | Wholesale & retail | 2025 |
| National Centre for Global Innovation and Enterprise Ltd | Administrative & support | 2017 |
| National Church Organisation Limited | Real estate | 2025 |
| National Infrastructure Group Ltd | Construction | 2023 |
| Nationwide Equipment Training Ltd | Administrative & support | 2021 |
| Nationwide Rehabilitation Limited | Administrative & support | 2008 |
| Nattieclean Ltd | Administrative & support | 2024 |
| Natures Window Limited | Wholesale & retail | 2025 |
| Nautilus ARK Ltd | Professional & scientific | 2024 |
| Nawbw Limited | Other services | 2005 |
| Nayyar Property Limited | Real estate | 2021 |
| NAZ Group Limited | Real estate | 2018 |
| NB Locum Private Ltd | Wholesale & retail | 2026 |
| NB Physiotherapy Ltd. | Health & social care | 2014 |
| NC and CC Services Limited | Water & waste | 2009 |