| M Halls Electrical Ltd | Construction | 2019 |
| M Heera Ltd | Wholesale & retail | 2025 |
| M Houghton Building and Development Ltd | Construction | 2017 |
| M J Burrells Plumbing and Heating Ltd | Construction | 2014 |
| M J Hillson Group Limited | Construction | 1973 |
| M J Roofing Ltd | Construction | 2025 |
| M J S Installations Ltd | Construction | 2024 |
| M K Nisar Limited | Health & social care | 2018 |
| M K Ventilation Ltd | Professional & scientific | 2025 |
| M L Friederich Ltd | Construction | 2024 |
| M M Dubois Limited | Financial services | 2004 |
| M Nail Beauty Limited | Other services | 2026 |
| M O'Brien Civil Engineering Ltd | Construction | 1962 |
| M O'Brien Plant Hire (Winsford) Limited | Administrative & support | 2016 |
| M P Wilson Ltd | Professional & scientific | 2024 |
| M Richardson Holdings Ltd | Financial services | 2025 |
| M Rybacki Limited | Transport & logistics | 2019 |
| M S Dilley Consulting Limited | Information & communication | 2016 |
| M T Productions Ltd | Construction | 2017 |
| M W Cleansing Limited | Administrative & support | 2004 |
| M Whitehall Construction Limited | Construction | 2018 |
| M Y Cars (UK) Limited | Wholesale & retail | 2006 |
| M&A Destination Ltd | Transport & logistics | 2018 |
| M&C Home Support Ltd | Public administration | 2020 |
| M&D Security Limited | Administrative & support | 2025 |
| M&E Management Solutions Limited | Professional & scientific | 2016 |
| M&E Transport (Bedford) Ltd | Professional & scientific | 2018 |
| M&G Investment Holdings Ltd | Real estate | 2025 |
| M&H Ecology Limited | Construction | 2015 |
| M&M Barber Shop Limited | Other services | 2017 |
| M&M Building & Plastering Ltd | Construction | 2020 |
| M&M Financial Management Limited | Professional & scientific | 2024 |
| M&M Welding Limited | Manufacturing | 2014 |
| M&O Plant Limited | Construction | 2019 |
| M&S Property Investment Services Ltd | Real estate | 2025 |
| M&V Utility Solution Limited | Construction | 2024 |
| M&Z Motors Ltd | Wholesale & retail | 2020 |
| M-C-N Store Limited | Wholesale & retail | 2022 |
| M-Tech.Co.Uk Ltd | Manufacturing | 2003 |
| M. Henrickson Flat Roofing Services Limited | Construction | 1997 |
| M. O'Brien (Plant Hire) Ltd. | Administrative & support | 1996 |
| M. O'Brien Agricultural Ltd | Agriculture & fishing | 2020 |
| M.A.W Construction & Civil Engineering Ltd | Construction | 2019 |
| M.Afireprotection Ltd | Public administration | 2026 |
| M.C. Electronics (Bedford) Ltd | Manufacturing | 2015 |
| M.E.N.S. Properties Limited | Real estate | 2014 |
| M.E.N.S. Properties Residential Limited | Real estate | 2019 |
| M.F. Electrical Limited | Construction | 2007 |
| M.G.Cob Construction Limited | Construction | 2020 |
| M.I.A Services Bedford Ltd | Administrative & support | 2021 |
| M.K. Fleetclean Limited | Administrative & support | 2004 |
| M.Niko Transport Ltd | Transport & logistics | 2020 |
| M.S.K. Trading Ltd | Transport & logistics | 2013 |
| M.W.Transportlogistic Limited | Transport & logistics | 2015 |
| M.Whelan Transport Limited | Transport & logistics | 2024 |
| M1 Pizza & Grill Ltd | Hospitality | 2025 |
| M23S Electrical Limited | Construction | 2020 |
| M2C Innovation Ltd | Wholesale & retail | 2007 |
| M2MI Ltd | Professional & scientific | 2025 |
| M50 Projects Limited | Professional & scientific | 2014 |
| MA Medics Limited | Health & social care | 2011 |
| MA Properties Bedford Ltd | Real estate | 2026 |
| MA Publications Limited | Information & communication | 2018 |
| Ma-An Commerce Limited | Wholesale & retail | 2025 |
| MAA 1 Ltd | Real estate | 2016 |
| MAA Publishing Ltd | Wholesale & retail | 2026 |
| MAA UAG Limited | Real estate | 2014 |
| Maaceva Services Limited | Administrative & support | 2022 |
| Maame's Kitchen Ltd | Manufacturing | 2020 |
| Maano Care Limited | Health & social care | 2025 |
| Maano Celebrations Limited | Administrative & support | 2025 |
| Maarya Properties Ltd | Real estate | 2025 |
| MAB Management Solutions Ltd | Professional & scientific | 2014 |
| Mabels Munchies Ltd | Wholesale & retail | 2026 |
| MAC & JAC Property Investment Ltd | Real estate | 2022 |
| MAC (MK) Electrical Ltd | Construction | 2026 |
| MAC FC Cleaning Services Ltd | Administrative & support | 2018 |
| MAC Property Investments (Beds) Ltd | Real estate | 2020 |
| MAC2CASH Ltd | Extraterritorial | 2015 |
| Macadamia Support Limited | Health & social care | 2015 |
| Macer Investments Ltd | Real estate | 2022 |
| Macfarlane Catering Ltd | Hospitality | 2021 |
| Mach Estates Limited | Construction | 1986 |
| Machine Technik Limited | Manufacturing | 2012 |
| Macmillan Hairdressing Ltd | Other services | 2010 |
| Macotel Relocations Ltd | Real estate | 2021 |
| Macs Mechanics Ltd | Wholesale & retail | 2014 |
| MAD Transport Ltd | Transport & logistics | 2014 |
| MAD Baits Holdings Limited | Wholesale & retail | 2019 |
| MAD Baits Supplies Limited | Wholesale & retail | 2024 |
| Maddison Estates Limited | Real estate | 2021 |
| Made Beauty Limited | Wholesale & retail | 2025 |
| Made in Bedford Limited | Wholesale & retail | 2016 |
| Made in Britaly Ltd | Wholesale & retail | 2023 |
| Made in Events Group Ltd | Arts & recreation | 2026 |
| Made YOU Click Digital Ltd | Administrative & support | 2025 |
| Madein Events Limited | Arts & recreation | 2026 |
| Madeira Fish and Chips Ltd | Hospitality | 2026 |
| Madina Cars Ltd | Transport & logistics | 2023 |
| Madina Food Store Ltd | Wholesale & retail | 2024 |