| MO Mash Services Limited | Information & communication | 2026 |
| MO Sounds Ltd | Arts & recreation | 2023 |
| MOB (London) Ltd | Hospitality | 2019 |
| MOB I.T Services Ltd | Information & communication | 2024 |
| Mobastir Ltd | Information & communication | 2017 |
| Mobey Holdings Limited | Financial services | 2021 |
| Mobi Pizza Ovens Ltd | Wholesale & retail | 2015 |
| Mobile Mayhem Ltd | | 2005 |
| Mobile Suite Northampton Ltd | Wholesale & retail | 2024 |
| Mobile Telephones Limited | Professional & scientific | 1998 |
| Mobile VET Referral Ltd | Professional & scientific | 2023 |
| Mobocom Ltd | Wholesale & retail | 2013 |
| Mobushar Limited | Professional & scientific | 2020 |
| Mobylette Limited | Manufacturing | 2025 |
| MOC Group Ltd | Professional & scientific | 2016 |
| Mochaberry Limited | Wholesale & retail | 2005 |
| Mocron Ltd | Wholesale & retail | 2021 |
| Modadee Consultancy Ltd | Hospitality | 2022 |
| Modatek Ltd | Professional & scientific | 2013 |
| Modera Outlet Ltd | Wholesale & retail | 2025 |
| Modern Amusement Events Ltd | Hospitality | 2024 |
| Modern Amusement Limited | Hospitality | 2010 |
| Modern Digital Solutions Consultancy Ltd | Information & communication | 2023 |
| Modman Ltd | Manufacturing | 2021 |
| Modo Financial Planning Ltd | Financial services | 2016 |
| Mods & Rockers Design Ltd | Professional & scientific | 2017 |
| Modulife Ltd | Construction | 2025 |
| Mofor Solutions Limited | Health & social care | 2010 |
| Mogul Fight Management Ltd | Arts & recreation | 2011 |
| Mogul Group Ltd | Information & communication | 2020 |
| Moha Cars Ltd | Transport & logistics | 2023 |
| Mohamed Amine Ltd | Wholesale & retail | 2024 |
| Moho Hire Ltd | Administrative & support | 2021 |
| Moisei Construction Ltd | Construction | 2021 |
| Moisture Mapping Ltd | Construction | 2025 |
| Moka Care & Properties Ltd | Hospitality | 2025 |
| Moko Construction Ltd | Construction | 2025 |
| Mola Properties Limited | Real estate | 2024 |
| Mold Enterprises Ltd | Financial services | 2025 |
| Mold Vent Limited | Manufacturing | 2020 |
| Moldconstruct Ltd | Construction | 2018 |
| Moldel Digital Solutions Limited | Administrative & support | 2024 |
| Moldova JR Ltd | Hospitality | 2017 |
| Moldscaffolding Limited | Construction | 2022 |
| Moldsilva Ltd | Construction | 2022 |
| Moliso Transport Limited | Transport & logistics | 2013 |
| Molla Ltd | Construction | 2020 |
| Mollilian Ventures Ltd | Real estate | 2020 |
| Molly MAE Ballooning Limited | Arts & recreation | 2025 |
| Momento Vivere Limited | Financial services | 2015 |
| Momentum Media Limited | Professional & scientific | 2020 |
| Momentum Strength and Conditioning Ltd | Arts & recreation | 2024 |
| Momo Land Ltd | Wholesale & retail | 2022 |
| MON Cher Cafe Ltd | Hospitality | 2019 |
| MON Enterprises Limited | Transport & logistics | 2013 |
| Monara Properties Ltd | Real estate | 2025 |
| Monarch (Brackmills) Management Company Limited | Households | 2005 |
| Monarch Residential Group Ltd | Real estate | 2025 |
| Mondiale Studios Ltd | Information & communication | 2025 |
| Mondra Associates Limited | Financial services | 2007 |
| Money Saving Advisors Ltd | Other services | 2017 |
| Money$Hots Ltd | Wholesale & retail | 2026 |
| Moneytree Financial Services Limited | Financial services | 2003 |
| Mongoose Investments Limited | Wholesale & retail | 2018 |
| Mongoose Logistics Ltd | Transport & logistics | 2019 |
| Monie Healthcare Limited | Health & social care | 2011 |
| Monkery Collective Limited | Arts & recreation | 2017 |
| Monlau Solutions Ltd | Construction | 2017 |
| Mono Telecom Ltd | Information & communication | 2023 |
| Monolith Recovery Limited | Other services | 2013 |
| Monopol Barrack Road Ltd | Wholesale & retail | 2024 |
| Monopol Builders Ltd. | Construction | 2022 |
| Monopol Food Store Ltd | Wholesale & retail | 2026 |
| Monopoly Insurance Services Ltd | Financial services | 2018 |
| Monsoon Rain Limited | Hospitality | 2026 |
| Monsor UK Limited | Real estate | 2024 |
| Monsta Inc Ltd. | Administrative & support | 2015 |
| Monster Fish & Chip Co Ltd | Hospitality | 2014 |
| Montague (Euro) Limited | Transport & logistics | 1995 |
| Montague Private Office Limited | Administrative & support | 2017 |
| Monte Management Ltd | Real estate | 2007 |
| MOO PUB Ltd | Hospitality | 2017 |
| MOO Removals Limited | Transport & logistics | 2025 |
| Moo's Emporium Limited | Wholesale & retail | 2026 |
| Mooche Wala Ltd | Hospitality | 2023 |
| Moodmax Herbal Ltd | Wholesale & retail | 2025 |
| Mooks Design Limited | Manufacturing | 2006 |
| Moomy Ltd | Administrative & support | 2008 |
| Moon Light XAV Ltd | Arts & recreation | 2025 |
| Moon Studio Social Ltd | Professional & scientific | 2025 |
| Moonlight Nails & Beauty Salon Ltd | Other services | 2024 |
| Moonlight Rose Property Ltd | Real estate | 2025 |
| Moonlight Skin Ltd | Other services | 2024 |
| Moonte & Co Ltd | Wholesale & retail | 2024 |
| Moonvibe Ltd | Wholesale & retail | 2025 |
| Moopen Health Ltd | Manufacturing | 2025 |
| Moor Electrical Services Ltd | Construction | 2024 |
| Moor END Farm Day Nursery Ltd | Education | 2018 |
| Moor Property Services Ltd | Real estate | 2024 |
| Moor Road Management Company Limited | Real estate | 1989 |