| Luke Bennett Coaching Ltd | Education | 2024 |
| Lumic Freehold Ltd | Financial services | 2024 |
| Lumic Property Investors Ltd | Real estate | 2024 |
| Lutem Consulting Limited | Professional & scientific | 2017 |
| Lycan Auto Care Ltd | Administrative & support | 2020 |
| M & D Building Services (SW) Limited | Construction | 2025 |
| M C Buckle Limited | Construction | 2012 |
| M J Henwood Ltd | Real estate | 2016 |
| Mabl Risk Management Ltd | Professional & scientific | 2023 |
| Madison Amber Ltd | Other services | 2025 |
| Mage Property Ltd | Real estate | 2020 |
| Magnian Groundworks and Civil Engineering Limited | Construction | 1997 |
| MAID2CLEAN Chippenham Limited | Administrative & support | 2010 |
| MAID2CLEAN(HOMES & Flats) Limited | Other services | 2013 |
| Maison Beau Ltd | Construction | 2023 |
| Maison Star Ltd | Real estate | 2023 |
| Majuba (Stroud) Limited | Manufacturing | 2016 |
| Manner (UK) Limited | Wholesale & retail | 2012 |
| Manners Consulting Services Limited | Professional & scientific | 2005 |
| Manybricks Property Development Ltd | Real estate | 2024 |
| Marie Trading Company Limited | Professional & scientific | 1982 |
| Markone Projects Ltd. | Construction | 2018 |
| Martin Price Digital Limited | Professional & scientific | 2022 |
| Marvin Brown Soccer Limited | Education | 2025 |
| Massey Consulting Limited | Information & communication | 2021 |
| Mathewson Waters Architects LLP | | 2014 |
| Mayo Ltd | Professional & scientific | 2025 |
| Mcitl Ltd | Information & communication | 2019 |
| MCW Fine Arts Ltd | Wholesale & retail | 2021 |
| Medbury Investments Ltd | Real estate | 2020 |
| Medical Tax Advice Ltd | Professional & scientific | 2021 |
| Medshare Develop Ltd | Construction | 2026 |
| Medshare Lettings Ltd | Real estate | 2023 |
| Medshare Ltd | Real estate | 2018 |
| Mega Resources Midland Ltd | Wholesale & retail | 2023 |
| Meganboydcox Cleaning Ltd | Extraterritorial | 2021 |
| Megeric Ltd | Professional & scientific | 2026 |
| Melksham Carcare Centre Ltd | Wholesale & retail | 2025 |
| Melksham Groundworks & Development Limited | Construction | 2012 |
| Melo & Santos Logistics Ltd | Administrative & support | 2025 |
| Merak Hvac UK Limited | Manufacturing | 2025 |
| Metcalfe Property Management Ltd | Households | 2022 |
| Mewett Restaurants Ltd. | Hospitality | 2026 |
| MGH Group Ltd | Financial services | 2017 |
| Mgms Limited | Administrative & support | 2006 |
| Milo Global Limited | Information & communication | 2018 |
| Mindbrew Drinks Ltd | Manufacturing | 2025 |
| Mini Golf Events Ltd | Arts & recreation | 2023 |
| Mitchell Digital Media Ltd | Information & communication | 2022 |
| Mitchell ST Clair Limited | Professional & scientific | 2026 |
| MLB Consultants Limited | Professional & scientific | 2005 |
| MMS Resource Limited | Administrative & support | 2023 |
| MN Property Management Ltd | Real estate | 2024 |
| MO Son’S Transport Ltd | Transport & logistics | 2026 |
| Mobile Thinking (Central) Ltd | Wholesale & retail | 2014 |
| Mobile Thinking (South) Ltd | Information & communication | 2014 |
| Mobile Thinking Limited | Information & communication | 2014 |
| Moneyrow Ltd | Financial services | 2022 |
| Moneyrow Properties Ltd | Real estate | 2022 |
| Moxey Consulting Limited | Professional & scientific | 2025 |
| MR Wood's Holdings Ltd | Real estate | 2026 |
| MRB Electrical Ltd | Construction | 2024 |
| MTD Tax Advice Ltd | Professional & scientific | 2018 |
| Murlough Consultancy Ltd | Wholesale & retail | 2017 |
| Murrell Asset Holdings Ltd | Real estate | 2026 |
| Music and Motherhood CIC | Health & social care | 2025 |
| My Family's Property Group Ltd | Financial services | 2019 |
| My Family's Property Investments Ltd | Real estate | 2019 |
| My Family's Property Solutions Ltd | Real estate | 2019 |
| Mytton John Property Ltd | Real estate | 2019 |
| N H Brown Medical Services Ltd | Health & social care | 2011 |
| N-And Group Ltd | Manufacturing | 2015 |
| N2K Limited | Real estate | 2016 |
| Naked Properties Ltd | Real estate | 2017 |
| Natropy Ltd | Professional & scientific | 2023 |
| Natural Health and Fitness Limited | Health & social care | 2020 |
| NDJ Electrical Services Ltd | Construction | 2022 |
| NDU Property Ltd | Real estate | 2021 |
| Netmark Limited | | 1980 |
| Netzen Solutions Limited | Information & communication | 2005 |
| Neurone Limited | Manufacturing | 2021 |
| Newfound Property Limited | Real estate | 2025 |
| Newton Stone Investments Ltd | Real estate | 2026 |
| Next Level EDU Ltd | Professional & scientific | 2024 |
| Nexter Investments Ltd | Financial services | 2023 |
| Nice Little Find Investments Ltd | Real estate | 2021 |
| Nicholas P Davidge Limited | Professional & scientific | 2019 |
| Nicholls Repair Shop Limited | Wholesale & retail | 2014 |
| NO. 3 Alma Place Ltd | Real estate | 2021 |
| Nora Technology Ltd | Information & communication | 2026 |
| Nova Porta Ltd | Real estate | 2024 |
| Novum Property Ltd | Real estate | 2016 |
| NOW Living Ltd | Real estate | 2020 |
| NPA Motors Ltd | Wholesale & retail | 2024 |
| NR Roofing Ltd | Construction | 2025 |
| NSQ U.K. Ltd | Wholesale & retail | 2021 |
| NSW Limited | Construction | 2001 |
| Nyuki Kitchens & Bathrooms Ltd | Wholesale & retail | 2021 |
| Oak Leaf Accountancy Limited | Professional & scientific | 2012 |
| Oak Leaf Group Holdings Limited | Financial services | 2021 |