| MBB Property Management Ltd | Real estate | 2022 |
| MBC Solicitors Limited | Professional & scientific | 2006 |
| MBC World Services Ltd | Transport & logistics | 2026 |
| MBD Shechita Services Ltd | Hospitality | 2010 |
| MBF Coaching Ltd | Arts & recreation | 2025 |
| MBH Estates Limited | Real estate | 2017 |
| MBH Management Limited | Extraterritorial | 2017 |
| Mbhw Trading Limited | Professional & scientific | 2024 |
| Mbpy Realisations Limited | Manufacturing | 1989 |
| MBY Estates Ltd | Real estate | 2022 |
| MBY Group Ltd | Real estate | 2026 |
| MC Alpine Limited | Professional & scientific | 2022 |
| MC Estates Ltd | Real estate | 2013 |
| MC Facilities Services Limited | Construction | 2017 |
| MC Gourmet Ltd | Hospitality | 2018 |
| Mcallister Consultancy Limited | Professional & scientific | 2018 |
| Mccann Civil Engineering Contractors Ltd | Water & waste | 2017 |
| Mccann Services Ltd | Water & waste | 2018 |
| Mcclendon Creative Limited | Professional & scientific | 2025 |
| Mcconnells's Social Work Solutions Ltd | Health & social care | 2011 |
| Mcdonnell Property and Construction Limited | Construction | 2017 |
| MCE Executive Services Limited | Professional & scientific | 2008 |
| MCG Holdings (MCR) Ltd | Real estate | 2025 |
| Mcluving Productions Limited | Professional & scientific | 2020 |
| Mcmx Group Ltd | Real estate | 2025 |
| Mcnicholas Construction (Holdings) Limited | Financial services | 1971 |
| Mcnicholas Construction Services Limited | Other services | 1980 |
| Mcphoenix Limited | Real estate | 2026 |
| MCR Hire Ltd | Administrative & support | 2019 |
| MCR Auto Mechanic Ltd | Wholesale & retail | 2025 |
| MCR Bodywork Pro Limited | Wholesale & retail | 2026 |
| MCR Builders Limited | Construction | 2016 |
| MCR Car Hire Ltd | Administrative & support | 2015 |
| MCR Car Sales Limited | Wholesale & retail | 2023 |
| MCR Concrete Ltd | Manufacturing | 2021 |
| MCR Dance Studios Limited | Education | 2023 |
| MCR Fast FIX Ltd | Wholesale & retail | 2024 |
| MCR Holiday Lets Ltd | Real estate | 2016 |
| MCR Motor Repair Ltd | Wholesale & retail | 2024 |
| MCR Nails Ltd | Other services | 2026 |
| MCR Recovery 26 Ltd | Transport & logistics | 2024 |
| MCR Skin Clinic Ltd | Other services | 2026 |
| MCR Vaping Ltd | Other services | 2017 |
| Mcrbikes Ltd | Wholesale & retail | 2022 |
| Mcrdesign Ltd | Professional & scientific | 2020 |
| Mcrtec Ltd | Wholesale & retail | 2025 |
| Mcrtrade Ltd | Wholesale & retail | 2015 |
| MCS Commercial Investments Ltd | Real estate | 2018 |
| MCSQUARED2 Ltd | Financial services | 2025 |
| MCW Estates Ltd | Real estate | 2022 |
| MD Car Service & Repair Ltd | Wholesale & retail | 2024 |
| MD Cona Ltd | Real estate | 2022 |
| MD Discounts Ltd | Wholesale & retail | 2023 |
| MD Glass Installations Ltd | Professional & scientific | 2023 |
| MD Syndicates Ltd | Financial services | 2019 |
| MDC Salford Ltd | Wholesale & retail | 2024 |
| MDD Creative Ltd | Arts & recreation | 2026 |
| MDN Medical Limited | Health & social care | 2014 |
| MDR Doors Ltd | Professional & scientific | 2023 |
| MDS Flowers Ltd | Wholesale & retail | 2018 |
| ME & YOU Cafe Ltd | Hospitality | 2025 |
| Meacamilopelyjos Africa Ltd | Hospitality | 2015 |
| Meadgrove Ltd | Extraterritorial | 2007 |
| Meadowbrook Farm Management Company Ltd | Households | 2023 |
| Meadowside Properties Ltd | Real estate | 2018 |
| Meadowview Supported Living Ltd | Health & social care | 2026 |
| Meah Bemeah Ltd | Wholesale & retail | 2026 |
| Mealen Holdings Ltd | Administrative & support | 2025 |
| Meals Support Limited | Hospitality | 2016 |
| Mealsgate Ltd | Real estate | 2023 |
| Meanes Limited | Professional & scientific | 2016 |
| Meantime Amat Limited | Information & communication | 2018 |
| Meanwhile Ltd | Professional & scientific | 2022 |
| Measuremax Limited | Professional & scientific | 2023 |
| Meat the Board Ltd | Hospitality | 2024 |
| Mebro Enterprise Ltd | Construction | 2017 |
| Meck Valley Properties Ltd | Construction | 2024 |
| MED Faith Healthcare Supplies Ltd | Wholesale & retail | 2022 |
| Medaille Trust | Health & social care | 2006 |
| Medbit Ltd | Professional & scientific | 2020 |
| MEDEQUIP4KIDS Limited | Other services | 2003 |
| Medi-Ray UV Ltd | Manufacturing | 2020 |
| MEDI8ERS Ltd | Professional & scientific | 2024 |
| Media Consultancy Group Ltd | Professional & scientific | 2018 |
| Media Masters Motion Films Limited | Information & communication | 2021 |
| Media Venture Holdings 1 Limited | Administrative & support | 2022 |
| Mediai Research Ltd | Information & communication | 2024 |
| Medic Success Limited | Health & social care | 2015 |
| Medical Elixir Limited | Health & social care | 2014 |
| Medicali Dispense Ltd | Wholesale & retail | 2024 |
| Medicfitt Limited | Manufacturing | 2016 |
| Mediterranean House Ltd | Hospitality | 2025 |
| Medius Suites Holdings Limited | Professional & scientific | 2015 |
| Mednode Systems Ltd | Information & communication | 2026 |
| Medomsley Estates Holdings Limited | Other services | 2025 |
| Meely UK Limited | Information & communication | 2025 |
| Meemarc Ltd | Wholesale & retail | 2025 |
| Meetlyr Limited | Information & communication | 2025 |
| Meezee Limited | Wholesale & retail | 2023 |
| Mefarnes Limited | Real estate | 2020 |