| MB Worldwide Ltd | Wholesale & retail | 2018 |
| MB39 Holdings Limited | Financial services | 2025 |
| MBA Investment Management Ltd | Financial services | 2022 |
| Mban Ltd | Wholesale & retail | 2024 |
| MBB Global Solutions Ltd | Wholesale & retail | 2018 |
| Mbbs Corp Ltd | Real estate | 2018 |
| MBC Satellite Ltd | Information & communication | 2020 |
| MBC Solutions Limited | Administrative & support | 2019 |
| MBC123 Ltd | Manufacturing | 2002 |
| Mbct Limited | Transport & logistics | 2020 |
| MBD Marketing and Business Development Agency Ltd | Wholesale & retail | 2024 |
| Mbfib Limited | Administrative & support | 2009 |
| MBH International Holding Ltd | Financial services | 2025 |
| MBI & Partners U.K. Limited. | Administrative & support | 1991 |
| MBI Media Networks Limited | Information & communication | 2012 |
| MBI Network Television Limited | Information & communication | 2001 |
| MBK Enterprise Ltd | Administrative & support | 2018 |
| MBK United Ltd | Wholesale & retail | 2025 |
| Mbkc Consulting Limited | Professional & scientific | 2015 |
| Mblogistics Group Ltd | Transport & logistics | 2023 |
| MBM Care Limited | Other services | 2018 |
| Mbot Ltd | Financial services | 2017 |
| MBP Holdings Limited | Financial services | 2018 |
| Mbrt Properties Ltd | Real estate | 2025 |
| MBS Corporation Ltd | Real estate | 2025 |
| MBT Manufacturing Limited | Manufacturing | 2020 |
| MBT Wttr Holdings Limited | Financial services | 2026 |
| MBU Capital Asset Management Limited | Real estate | 2017 |
| MBU Capital Ventures Limited | Administrative & support | 2018 |
| MBV Groundworks and Civils Ltd | Construction | 2024 |
| Mbyd Ltd | Information & communication | 2019 |
| MC & Maekleon Media Ltd | Information & communication | 2014 |
| MC 483 Limited | Real estate | 2010 |
| MC Cardiff Pubco Limited | Hospitality | 2026 |
| MC Events Group Ltd | Administrative & support | 2018 |
| MC Lakes Properties Ltd | Households | 2025 |
| MC Ramsden Ltd | Real estate | 2023 |
| MC Scaffolding Services Ltd | Construction | 2023 |
| MC Sims Limited | Hospitality | 2020 |
| MC Sneakz Ltd | Wholesale & retail | 2021 |
| MC Vehicles Ltd | Wholesale & retail | 2025 |
| MC199 Limited | Real estate | 2001 |
| MC295 Limited | Real estate | 2003 |
| MC418 Limited | Real estate | 2007 |
| MC493 Limited | Real estate | 2011 |
| MCA Care Solutions Ltd | Professional & scientific | 2019 |
| MCA Consulting (UK) Limited | Professional & scientific | 2013 |
| MCA Shipping Ltd | Administrative & support | 2003 |
| Mcallister, Davis & Goldstein LLP | | 2015 |
| Mcari Services Ltd | Information & communication | 2005 |
| MCB Leisure Ltd | Wholesale & retail | 2023 |
| Mcba Consulting Limited | Professional & scientific | 2014 |
| Mcbride Masonry Ltd | Construction | 2019 |
| Mccabe Properties Ltd | Construction | 2021 |
| Mccaff Ltd | Professional & scientific | 2018 |
| Mccaig & Macdonald Limited | Professional & scientific | 2019 |
| Mccann & Partners Ltd | Construction | 2005 |
| Mccarthy Clinical Services Ltd | Health & social care | 2013 |
| Mccarthy Contractors Limited | Professional & scientific | 1995 |
| Mccarthy Family Investment Company Limited | Real estate | 2016 |
| Mccarty Consulting Ltd | Professional & scientific | 2023 |
| Mcclean Contract Limited | Administrative & support | 2016 |
| Mccompany Ltd | Wholesale & retail | 2025 |
| Mcconkey Engineering Ltd | Construction | 2025 |
| Mcconnachie Developments Limited | Real estate | 2017 |
| Mccree Engineering and Construction Ltd | Construction | 2018 |
| Mcdadi Ltd | Wholesale & retail | 2025 |
| Mcdkeys Ltd | Information & communication | 2023 |
| Mcdower Media Ltd. | Wholesale & retail | 2024 |
| MCE Beauty Limited | Other services | 2025 |
| Mcentee Tianqin Limited | Wholesale & retail | 2025 |
| MCF - Concierge and Housekeeping Services Ltd | Real estate | 2020 |
| Mcfie Construction Ltd | Construction | 2017 |
| MCG Cosmetics UK Ltd | Wholesale & retail | 2022 |
| MCG UK Consulting Limited | Professional & scientific | 2020 |
| Mcgbs Limited | Administrative & support | 2025 |
| Mcgilligan ENT Limited | Health & social care | 2025 |
| Mcginnis Homes Limited | Construction | 2017 |
| Mcgraphic Ltd | Professional & scientific | 2018 |
| Mcgregorians | Professional & scientific | 2023 |
| Mchugh Roofing & Cladding Ltd | Construction | 2013 |
| MCI Shareholder Ltd | Information & communication | 2018 |
| Mcisla Recruitment Devon Ltd | Other services | 2021 |
| MCJ INT. Ltd | Construction | 2020 |
| MCJ Lodgings Ltd | Hospitality | 2024 |
| Mcjay Properties Ltd | Real estate | 2024 |
| MCK Enterprises Limited | Administrative & support | 2025 |
| MCK Platinum Ltd | Administrative & support | 2025 |
| Mckbell Property Developments Ltd | Real estate | 2022 |
| Mckelvie - Gibbs Limited | Professional & scientific | 2018 |
| Mckenna Williams Limited | Hospitality | 2018 |
| Mckenzie Law Partners Ltd | Professional & scientific | 2013 |
| Mckenzie&Tc Ltd | Wholesale & retail | 2020 |
| Mckev Plumbing & Heating Ltd | Construction | 2020 |
| Mckinnony Ltd | Professional & scientific | 2023 |
| Mckinsley Engineering Limited | Manufacturing | 2015 |
| Mcld Ltd | Real estate | 2019 |
| Mcle Ltd | Professional & scientific | 2016 |
| MCM Facility Services Ltd | Administrative & support | 2024 |
| MCM Foundation | Information & communication | 2022 |