| Mlmch | Professional & scientific | 2019 |
| MLR Interiors Ltd | Construction | 2023 |
| MLR Optical Limited | Wholesale & retail | 2017 |
| MLS Law (Property) Limited | Professional & scientific | 2017 |
| MLS Psychology Ltd | Education | 2022 |
| MM & HE Limited | Hospitality | 2025 |
| MM (Yorkshire) Ltd | Construction | 2025 |
| MM Consulting & Accounting Ltd | Information & communication | 2014 |
| MM Cubed Limited | Real estate | 2021 |
| MM Garden Works Domestic Ltd | Administrative & support | 2020 |
| MM Garden Works Ltd | Administrative & support | 2020 |
| MM Northern House Ltd | Hospitality | 2019 |
| MM Property Group (Leeds) Ltd | Real estate | 2022 |
| MM Training Solutions Ltd | Manufacturing | 2020 |
| Mm&F Fiduciary Limited | Professional & scientific | 2006 |
| Mm&F Trustees Limited | Professional & scientific | 2006 |
| Mm&Gg Limited | Transport & logistics | 2023 |
| Mm&S JM Limited | Administrative & support | 2016 |
| MMA Fast Food Ltd | Hospitality | 2019 |
| Mmajoka Ltd | Health & social care | 2019 |
| Mmcd Investments Limited | Financial services | 2014 |
| Mmcg (2) Limited | Health & social care | 2017 |
| Mmcg (3) Limited | Health & social care | 2017 |
| Mmcg (4) Limited | Health & social care | 2020 |
| Mmcg (CCH) (2) Limited | Health & social care | 2011 |
| Mmcg (CCH) (3) Limited | Health & social care | 2013 |
| Mmcg (CCH) (5) Limited | Health & social care | 2022 |
| Mmcg (CCH) (Acorn) Limited | Extraterritorial | 2020 |
| Mmcg (CCH) (Barnes) Limited | Health & social care | 2022 |
| Mmcg (CCH) (Belmont) Limited | Health & social care | 2013 |
| Mmcg (CCH) (Croft) Limited | Health & social care | 2022 |
| Mmcg (CCH) (Earsdon) Limited | Health & social care | 2023 |
| Mmcg (CCH) (Gateford) Limited | Health & social care | 2022 |
| Mmcg (CCH) (Howgate) Limited | Health & social care | 2022 |
| Mmcg (CCH) (Manor) Limited | Health & social care | 2022 |
| Mmcg (CCH) Limited | Health & social care | 2011 |
| Mmcg Central Services Limited | Health & social care | 2026 |
| Mmcg Domo Holdings Limited | Health & social care | 2026 |
| Mmcg Holdings Limited | Professional & scientific | 2014 |
| Mmcg Octopus Holdings Limited | Health & social care | 2026 |
| Mmcg Target Healthcare Holdings Limited | Health & social care | 2026 |
| Mmcg Topco Limited | Health & social care | 2026 |
| MMCG2 Devco 5 Limited | Construction | 2025 |
| MMG Fast Food Ltd | Hospitality | 2023 |
| MMG Kitchen Ltd | Hospitality | 2024 |
| Mmhs Services Ltd | Wholesale & retail | 2019 |
| MMI Holdings (NE) Limited | Financial services | 2020 |
| MMI Property Limited | Real estate | 2025 |
| Mmi-Uk (Heat Exchanger Assembly Solutions) Ltd | Manufacturing | 2014 |
| Mmij Bricklaying Ltd | Construction | 2023 |
| MMM Apparels Ltd | Wholesale & retail | 2025 |
| MMM Electrical Ltd | Construction | 2025 |
| MMM Residential Ltd | Real estate | 2020 |
| Mmmcars Ltd | Wholesale & retail | 2019 |
| MMP Fabrications Ltd. | Manufacturing | 1977 |
| MMR 2025 Ltd | Hospitality | 2025 |
| MMR Investment Limited | Real estate | 2021 |
| MMS Construction Ltd Ltd | Construction | 2026 |
| MMS Dent Ltd | Health & social care | 2019 |
| MMS Digital Ltd | Professional & scientific | 2024 |
| MMS Electronics Limited | Professional & scientific | 1997 |
| MMS Financial Services Limited | Professional & scientific | 2016 |
| MMS. Cleaning UK Ltd | Administrative & support | 2020 |
| Mms.Care UK Ltd | Administrative & support | 2020 |
| Mmss Limited | Professional & scientific | 2023 |
| Mmtc Construct Ltd | Construction | 2025 |
| MMW Green Solutions Limited | Construction | 2016 |
| MN Associates Limited | Administrative & support | 2011 |
| MN Comercials Ltd | Administrative & support | 2026 |
| MN Commercial Kitchens Ltd | Administrative & support | 2026 |
| MN Contracting Limited | Construction | 2026 |
| MN Extensions Ltd | Wholesale & retail | 2024 |
| MN Motors Limited | Wholesale & retail | 2024 |
| MN Plumbing & Tiling Limited | Construction | 2015 |
| MN Spuds Leeds Limited | Hospitality | 2026 |
| MN Trading Limited | Wholesale & retail | 2015 |
| MNA Legal Ltd | Professional & scientific | 2020 |
| MNA Portfolio Ltd | Real estate | 2021 |
| Mnaq Property Ltd | Real estate | 2019 |
| MNC Consultancy Limited | Professional & scientific | 2015 |
| MNC Recruitment Ltd | Administrative & support | 2025 |
| MND Morris Consultancy Ltd | Professional & scientific | 2025 |
| MND Supreme Cleaning Services Limited | Administrative & support | 2017 |
| MNG Properties(Yorkshire) Ltd | Real estate | 2024 |
| MNH Property Ltd | Real estate | 2021 |
| MNI Autos Leeds Ltd | Wholesale & retail | 2023 |
| MNK Ecom Ltd | Wholesale & retail | 2026 |
| MNM Savoury Limited | Hospitality | 2025 |
| MNR Logistics Ltd | Transport & logistics | 2024 |
| MNR Medical Limited | Health & social care | 2019 |
| MNR Solutions Ltd | Health & social care | 2022 |
| MNS Leeds Limited | Hospitality | 2023 |
| MNS Meds Ltd | Health & social care | 2018 |
| MNT Tech Limited | Information & communication | 2024 |
| Mnth Ltd | Information & communication | 2025 |
| MNW Property Investors Ltd | Real estate | 2024 |
| MO 24/7 Services Limited | Administrative & support | 2020 |
| Mo's Barbering Co Ltd | Other services | 2017 |
| Mo'Saak Limited | Hospitality | 2024 |
| Moagi Ltd | Health & social care | 2021 |