| Mistral Energy Products Limited | Manufacturing | 1998 |
| Mitch Gough (UK) Limited | Financial services | 2026 |
| Mitek Ltd | Other services | 2020 |
| Mitra Financial Planning Ltd | Professional & scientific | 2024 |
| Mitre Beauty Academy Ltd | Other services | 2026 |
| Mixifie Limited | Wholesale & retail | 2020 |
| Miyumi Ltd | Information & communication | 2014 |
| Mizna Properties Ltd | Real estate | 2025 |
| MJ Building and Civil Engineering Limited | Financial services | 2022 |
| MJ Key Estates Ltd | Real estate | 2024 |
| MJ Transport & Trade Ltd | Transport & logistics | 2021 |
| Mj&Jj Bratton Developments Ltd | Real estate | 2025 |
| Mjet Consulting Ltd | Information & communication | 2026 |
| MJF Distribution Limited | Transport & logistics | 2009 |
| Mjps Estate Ltd | Real estate | 2024 |
| MJQ Electrical Services Ltd | Construction | 2026 |
| MJR Manufacturing Improvements Ltd | Professional & scientific | 2015 |
| MJT Property Partners Limited | Real estate | 2025 |
| MK Prime Lettings Ltd | Real estate | 2025 |
| MK Sons Properties Ltd | Real estate | 2022 |
| MKD Telford Properties Limited | Real estate | 2024 |
| Mkfurniture Ltd | Wholesale & retail | 2017 |
| MKJ Ignite Limited | Administrative & support | 2023 |
| Ml&A Consultant Limited | Professional & scientific | 2023 |
| MLC Auditors Limited | Professional & scientific | 2023 |
| MLS Engineering Ltd | Information & communication | 2024 |
| MM Cargo Express Limited | Transport & logistics | 2026 |
| Mmove Wellness Studio Ltd | Arts & recreation | 2025 |
| MNA Estates Ltd | Real estate | 2023 |
| MNG Cars Ltd | Wholesale & retail | 2025 |
| Moba (UK) Limited | Manufacturing | 1966 |
| Mobile Care Accesories Limited | Wholesale & retail | 2021 |
| Mobile Service Experts Ltd | Real estate | 2013 |
| Mobile Solutions Limited | Administrative & support | 2011 |
| Mobility for ALL Ages Ltd | Wholesale & retail | 2023 |
| Moccomade Limited | Wholesale & retail | 2025 |
| Mocksyapp Ltd | Information & communication | 2026 |
| MOD Light Limited | Information & communication | 2015 |
| Modedevieco Ltd | Wholesale & retail | 2022 |
| Modelpro Limited | Professional & scientific | 2023 |
| Mohair Bear Making Supplies Limited | Wholesale & retail | 2013 |
| Mohid Ltd | Other services | 2025 |
| Mohizza Limited | Real estate | 2024 |
| Mojdeh Investment Group Ltd | Financial services | 2024 |
| Moki's Ltd | Manufacturing | 2026 |
| Moldtek Ltd | Construction | 2019 |
| Molymer Moulding Services Ltd. | Manufacturing | 2023 |
| Monarch Salon Supply Limited | Wholesale & retail | 2023 |
| Monev Logistics Ltd | Transport & logistics | 2023 |
| Monkmoor Holdings Limited | Financial services | 2021 |
| Monrro Hair & Beauty Limited | Other services | 2019 |
| Montew Ltd | Other services | 2019 |
| MOO BAA LAA Limited | Wholesale & retail | 2023 |
| Moocow Studios Limited | Manufacturing | 2016 |
| Moogies Management Ltd | Information & communication | 2016 |
| Moon HON Limited | Hospitality | 2014 |
| Moon Skin Ltd | Other services | 2022 |
| Moonstruck Astronaut C.I.C. | Education | 2017 |
| Mordif Ltd | Other services | 2018 |
| More Than Care (Telford) Limited | Health & social care | 2022 |
| Moreyou Ltd | Education | 2026 |
| Morgan & Bevan Developments Ltd | Financial services | 2026 |
| Morgan BLU Ltd | Construction | 2024 |
| Morgan Electrical Services Ltd | Construction | 2026 |
| Morjon Developments Limited | Real estate | 2023 |
| Morris and Sons Telford Ltd | Administrative & support | 2014 |
| Morris Building Solutions Limited | Construction | 2016 |
| Morrone Ltd | Other services | 2019 |
| Morsepoint Menswear Ltd | Wholesale & retail | 2011 |
| Mortr Limited | Information & communication | 2016 |
| Morya Kartik Ltd | Health & social care | 2019 |
| Moscato Asset Management Limited | Real estate | 2026 |
| Moseley Storage Solutions Limited | Transport & logistics | 2023 |
| Mot.R.Us Autos Limited | Wholesale & retail | 2023 |
| Mot.R.Us Limited | Wholesale & retail | 2009 |
| Motif IT Limited | Information & communication | 2012 |
| Motivate Enterprises Ltd | Administrative & support | 2025 |
| Motorhome Brokerage Ltd | Wholesale & retail | 2017 |
| Motorkings Ltd | Wholesale & retail | 2022 |
| Motormind Limited | Wholesale & retail | 2024 |
| Motorvelo Ltd | Professional & scientific | 2021 |
| Mountain Estate Agents Ltd | Real estate | 2020 |
| Mountain Mist Escapes Limited | Real estate | 2025 |
| Mouse House Consultancy Limited | Professional & scientific | 2025 |
| Move IT Holiday Club Limited | Health & social care | 2023 |
| Movers and Home Improvers Ltd | Construction | 2025 |
| Mowgli Care Services Ltd | Health & social care | 2024 |
| Mowmenal Ltd | Real estate | 2024 |
| Moxley Local Limited | Professional & scientific | 2024 |
| MPH Coaching Ltd | Wholesale & retail | 2017 |
| Mpmas Holdings Ltd | Financial services | 2020 |
| MR Mark Howell Limited | Construction | 2024 |
| MR Retro Leads Ltd | Manufacturing | 2019 |
| MR Trotter Ltd | Manufacturing | 2011 |
| Mrav Ltd | Transport & logistics | 2025 |
| MRCOOK68 Ltd | Hospitality | 2022 |
| MRD Engineering Ltd | Professional & scientific | 2024 |
| Mrdm Property Developments Ltd | Real estate | 2025 |
| MRS Goose at Home Ltd | Hospitality | 2014 |
| MRS Goose Ltd | Hospitality | 2026 |