| Luxlimo Ltd. | Wholesale & retail | 2019 |
| Luxury Global Brands Limited | Extraterritorial | 2016 |
| LV Engineering Services Ltd | Professional & scientific | 2026 |
| Lyons Bowe Limited | Professional & scientific | 2018 |
| M M & D Construction Ltd | Construction | 2020 |
| M&D Haulage Contractors Ltd | Transport & logistics | 2024 |
| MAD Animation Limited | Arts & recreation | 2015 |
| Maerdy Windfarm Community Funds Limited | Health & social care | 2011 |
| Magnus Europe Ltd | Professional & scientific | 2015 |
| Mago Elektro Ltd | Construction | 2020 |
| Make the Sunshine Community Interest Company | Education | 2019 |
| Malasoft Solutions Ltd | Information & communication | 2013 |
| Mallet Heating & Plumbing Ltd | Construction | 2025 |
| Management at Bridge Farm Ltd | Households | 2024 |
| Manor Farm Cranmore (Management) Limited | Households | 2002 |
| Manorborder Limited | Real estate | 1983 |
| Marc Jackson Electrical Limited | Construction | 2012 |
| Marian Brinza Ltd | Health & social care | 2021 |
| Mariana Lettings Ltd | Real estate | 2026 |
| Markonyx Ltd | Health & social care | 2022 |
| Markshall Farm Renewables Limited | Energy | 2025 |
| Marsh-Man Precision Engineering Limited | Manufacturing | 2013 |
| Marshall Security Limited | Professional & scientific | 2020 |
| Martindale Farm Renewables Limited | Energy | 2025 |
| Matsuns Ltd | | 2008 |
| Mauve Ice Retail Ltd | Wholesale & retail | 2026 |
| Mayfair House (Shepton Mallet) Management Company Limited | Households | 1989 |
| Mbfm Holdings Limited | Professional & scientific | 2017 |
| Means to a Lend Limited | Information & communication | 2018 |
| Medic Go Ltd | Health & social care | 2016 |
| Medical Specialist Services Ltd | Health & social care | 2015 |
| Mediquest Services Ltd | Health & social care | 2018 |
| Medtech Expert Limited | Professional & scientific | 2025 |
| Meees Group Limited | Financial services | 2026 |
| Meees-M&E Ltd | Manufacturing | 2026 |
| MEL Lock Consultancy Ltd | Professional & scientific | 2026 |
| Melisa Simionescu Ltd | Health & social care | 2022 |
| Melon Mission CIC | Education | 2026 |
| Melon Optics Limited | Wholesale & retail | 2006 |
| Mendip & Bristol West Pet Care Services Limited | Professional & scientific | 2024 |
| Mendip Autoserve Limited | Wholesale & retail | 2009 |
| Mendip Commercial Property Limited | Real estate | 2019 |
| Mendip Community Transport | Transport & logistics | 2002 |
| Mendip Engineering Services Ltd | Manufacturing | 2020 |
| Mendip Houses Ltd | Administrative & support | 2018 |
| Mendip Projects Management Company Limited | Households | 2000 |
| Mendip Safety Supplies Limited | Wholesale & retail | 2022 |
| Mendoza Jones Property Limited | Real estate | 2022 |
| Merryfield Farmers Limited | Agriculture & fishing | 2006 |
| Metalia Brothers Ltd | Wholesale & retail | 2024 |
| MG Strategy Ltd | Hospitality | 2019 |
| MH Technics Ltd | Professional & scientific | 2020 |
| Michael Whsky Ltd | Wholesale & retail | 2021 |
| Midelton Limited | Professional & scientific | 2012 |
| Midsomer Lodges Ltd | Hospitality | 2019 |
| Miken Holdings Limited | Financial services | 2020 |
| Millbrook Property Limited | Real estate | 2022 |
| Miller Transport Limited | Transport & logistics | 2018 |
| Millie Wright Limited | Real estate | 2024 |
| Minack & Co Limited | Construction | 2017 |
| Ministry of Calm Ltd | Professional & scientific | 2023 |
| Ministry of Decals Limited | Manufacturing | 2023 |
| Mira Market Ltd | Wholesale & retail | 2026 |
| Mirage Signs Limited | Manufacturing | 2002 |
| Miranda Ryder Digital Ltd | Professional & scientific | 2019 |
| Mission Control Software Ltd | Information & communication | 2019 |
| Mitcham Canada Holdings Limited | Professional & scientific | 2011 |
| Mitcham Holdings Ltd | Professional & scientific | 2011 |
| Miz's MAC Ltd | Hospitality | 2024 |
| MJ Services (Southern) Limited | Professional & scientific | 2007 |
| Modern Souvenir Company Limited | Extraterritorial | 2026 |
| Mole's Coffee Ltd | Hospitality | 2024 |
| Moles Mexican Ltd | Hospitality | 2024 |
| Monnie Accounting Services Ltd | Information & communication | 2022 |
| Monsters of Dirt Ltd | Administrative & support | 2017 |
| Moon Estates Ltd | Wholesale & retail | 2026 |
| More Power Landscapes Ltd | Administrative & support | 2025 |
| Morgans Heating & Plumbing Ltd | Construction | 2017 |
| Morocco Trading Ltd | Wholesale & retail | 2022 |
| Morrison Developments Ltd | Construction | 2023 |
| Mosaictech Ltd | Other services | 2017 |
| Motoriety Ltd | Wholesale & retail | 2023 |
| Mount Collective Limited | Wholesale & retail | 2023 |
| Mountains Green Ltd | Information & communication | 2011 |
| MPN Design Ltd | Professional & scientific | 2016 |
| MR Sheep Ltd | Wholesale & retail | 2026 |
| MSM Plumbing and Building Contractors Limited | Construction | 2024 |
| MTB Trading Group Ltd | Wholesale & retail | 2025 |
| Mughal Spices Ltd | Hospitality | 2025 |
| Muse Pilates Studio Ltd | Arts & recreation | 2026 |
| Museum to YOU CIC | Education | 2023 |
| MWB Technologies Limited | Professional & scientific | 2007 |
| Mwellsediting Limited | Information & communication | 2016 |
| N L Motorhomes Limited | Wholesale & retail | 2013 |
| N Lintern Limited | Construction | 2012 |
| NA Joinery Ltd | Manufacturing | 2025 |
| Naja Media Ltd | Information & communication | 2026 |
| NAR Tech Solutions Ltd | Wholesale & retail | 2024 |
| Naturally Purrfect Ltd | Manufacturing | 2024 |
| Nckgraves Haulage LLP | | 2022 |