| Miss MAY Limited | Wholesale & retail | 2024 |
| Miss Renee Cares Ltd | Administrative & support | 2015 |
| Miss Snow Ltd | Hospitality | 2024 |
| Missall Theatre Ltd | Arts & recreation | 2025 |
| Misshouse Limited | Manufacturing | 2024 |
| Missing Richard Ltd | Information & communication | 2022 |
| Missionstart Limited | Professional & scientific | 2012 |
| Missk Investments Ltd | Real estate | 2024 |
| Misstress Ltd | Professional & scientific | 2024 |
| Missy UK Limited | Wholesale & retail | 2003 |
| Missy’S Touch Ltd | Other services | 2023 |
| Mist 3 Windows Limited | Other services | 2018 |
| Mister Moran Ltd | Arts & recreation | 2025 |
| Mister Motivaper Limited | Wholesale & retail | 2016 |
| Misty Meadows Management Company Ltd | Households | 2016 |
| Misumi Nutraesthetics Limited | Health & social care | 2024 |
| MIT Solutions R&D Ltd | Information & communication | 2020 |
| MIT Transports Ltd | Transport & logistics | 2026 |
| Mitaka Limited | Administrative & support | 1982 |
| Mitchell & Urwin Academy Limited | Wholesale & retail | 2011 |
| Mitchell & Urwin Brickwork Contractors EOT Trustee Limited | Other services | 2023 |
| Mitchell & Urwin Brickwork Contractors Limited | Construction | 2002 |
| Mitchell & Urwin Brickyard Limited | Wholesale & retail | 2011 |
| Mitchell & Urwin Properties Limited | Construction | 2021 |
| Mitchell & Urwin Protectic Limited | Wholesale & retail | 2011 |
| Mitchell & Urwin Scaffolding Limited | Wholesale & retail | 2011 |
| Mitchell Financial Planning Limited | Financial services | 2015 |
| Mitchell Halton Watson Limited | Professional & scientific | 2000 |
| Mitchell Media Ltd | Professional & scientific | 2023 |
| Mitchell Wilkinson Limited | Information & communication | 2024 |
| Mitchley & Associates Ltd | Professional & scientific | 2010 |
| Mithi 3 Ltd | Health & social care | 2021 |
| Mithi Trust Ltd | Health & social care | 2022 |
| Mithila in UK CIC | Education | 2026 |
| Mitre Manufacturing Limited | Manufacturing | 2025 |
| Mitrika Ltd | Manufacturing | 2025 |
| Mitsuru Yorkshire Karate Limited | Arts & recreation | 2017 |
| Mitton Aftercare Limited | Construction | 2003 |
| Mitton Mechanical Services Limited | Construction | 1957 |
| Mittsu (Holdings) Limited | Hospitality | 2025 |
| Miuk Limited | Education | 2020 |
| Miura Equities Limited | Professional & scientific | 2025 |
| MIVE-1 Ltd | Real estate | 2020 |
| Mivia Homes Ltd | Real estate | 2025 |
| Mivid Consulting Limited | Professional & scientific | 2022 |
| Mivo Services Ltd | Construction | 2023 |
| Mivoux Limited | Manufacturing | 2022 |
| MIW Properties Limited | Real estate | 2023 |
| Miwan Restaurant Ltd | Hospitality | 2026 |
| Miwsa Ltd | Professional & scientific | 2023 |
| MIX and Twist Corporate Limited | Hospitality | 2014 |
| MIX of Flavours Limited | Hospitality | 2020 |
| Mixd Limited | Information & communication | 2004 |
| Mixer MAN (Haulage) Ltd | Construction | 2017 |
| Mizon Travel Limited | Administrative & support | 2026 |
| MJ Capital International Limited | Information & communication | 2025 |
| MJ Cart Ltd | Wholesale & retail | 2025 |
| MJ Civil Engineering Yorkshire Ltd | Construction | 2021 |
| MJ Civil Holdings Ltd | Financial services | 2026 |
| MJ Commercial Ltd | Other services | 2011 |
| MJ Delivery DC Ltd | Transport & logistics | 2026 |
| MJ Electrical Ltd | Construction | 2022 |
| MJ Gornall Ltd | Information & communication | 2023 |
| MJ Green Investments Ltd | Financial services | 2025 |
| MJ Harwood Damp Proofing Specialist Leeds Ltd | Construction | 2024 |
| MJ Leeds Ltd | Hospitality | 2025 |
| MJ Mccarthy Developments Limited | Real estate | 2022 |
| MJ Mccarthy Investments Ltd | Financial services | 2022 |
| MJ Mcgarrity Ltd | Professional & scientific | 2024 |
| MJ Pizza Ltd | Hospitality | 2025 |
| MJ Premier Events Limited | Wholesale & retail | 2024 |
| MJ Property Consulting Limited | Real estate | 2016 |
| MJ Sports Limited | Wholesale & retail | 2022 |
| MJ Trasnsport Ltd | Transport & logistics | 2019 |
| MJ3 Corporation Limited | Information & communication | 2013 |
| MJA Consultants Ltd | Other services | 2025 |
| MJA Engineering Solutions Limited | Administrative & support | 2019 |
| MJA Property Holdings Limited | Real estate | 2020 |
| MJA Property Investment Solutions Limited | Real estate | 2025 |
| Mjag Ltd | Water & waste | 2017 |
| Mjavaid Limited | Other services | 2017 |
| MJB Assets Ltd | Real estate | 2025 |
| MJB Recruitment Solutions Limited | Administrative & support | 2025 |
| MJC Design (Yorkshire) Limited | Professional & scientific | 2018 |
| MJC Trustees Limited | Professional & scientific | 2016 |
| MJE Holdings Ltd | Real estate | 2016 |
| Mjfc Limited | Professional & scientific | 2021 |
| MJG Decorators Limited | Construction | 2006 |
| MJG Software Ltd | Information & communication | 2017 |
| MJH Artstudio Limited | Professional & scientific | 2023 |
| MJH Consultants Ltd | Professional & scientific | 2019 |
| MJH Groundworks Limited | Construction | 2020 |
| MJH Law Ltd | Professional & scientific | 2017 |
| MJI (UK) Limited | Real estate | 2013 |
| Mjic Ltd | Professional & scientific | 2025 |
| MJK Cleaning Service Ltd | Administrative & support | 2018 |
| MJK Consultant Services Ltd | Professional & scientific | 2019 |
| Mjkj Properties Ltd | Real estate | 2022 |
| MJM Architectural Services Ltd | Professional & scientific | 2015 |
| MJM Design Studio Limited | Professional & scientific | 2013 |