| Montacute Grace Limited | Professional & scientific | 2019 |
| Montage Group Ltd | Wholesale & retail | 2019 |
| Montaigu Communications Ltd | Information & communication | 2019 |
| Montana House Ltd. | Professional & scientific | 2019 |
| Montbridge Construction Limited | Construction | 2026 |
| Montcaly Ltd | Professional & scientific | 2015 |
| Monte Alliance PC | | 2014 |
| Monte Carlo Marine Ltd | Administrative & support | 2020 |
| Monte Mayor Phoenix Ltd | Real estate | 2021 |
| Montecarlo Engineering Ltd | Manufacturing | 2013 |
| Montecrypto Ltd | Information & communication | 2020 |
| Montefield Ltd | Real estate | 2022 |
| Monterey Properties Limited | Real estate | 1984 |
| Montgomery Cameron Homes Ltd | Real estate | 2019 |
| Monthermer Loft Co Limited | Construction | 2020 |
| Montparnasse TV Ltd | Arts & recreation | 2025 |
| Montpelier Publications Ltd | Manufacturing | 1989 |
| Montpellier Hotel Limited | Hospitality | 2018 |
| Montreial College Ltd | Education | 2025 |
| Montreux Trading Ltd | Wholesale & retail | 2025 |
| Montrose Commercial Holdings Ltd | Real estate | 2026 |
| Montrose Place Management Limited | Real estate | 2006 |
| Montrose Residential Holdings Ltd | Real estate | 2022 |
| Monument Holdings Limited | | 1989 |
| Monument Lifts Ltd | Construction | 2020 |
| Monumental Welsh Women Ltd | Education | 2019 |
| Monuri PC | | 2018 |
| Monvia Ltd | Wholesale & retail | 2025 |
| MOO London Cardiff Limited | Hospitality | 2026 |
| MOO London Ltd | Hospitality | 2025 |
| MOO MOO Thai Tapas Ltd | Hospitality | 2019 |
| Moon C C Limited | Hospitality | 2017 |
| Moon Connected Ltd | Administrative & support | 2024 |
| Moon Inc Ltd | Professional & scientific | 2021 |
| Moon Labs Limited | Wholesale & retail | 2017 |
| Moon Marketing Ltd | Wholesale & retail | 2024 |
| Moon Natural-Beauty Ltd | Wholesale & retail | 2025 |
| Moon Ribbon Ltd | Wholesale & retail | 2025 |
| Moon Shop Limited | Wholesale & retail | 2019 |
| Moonag Properties Limited | Real estate | 2012 |
| Moonbugs Limited | Information & communication | 2010 |
| Mooncraft Limited | Real estate | 2008 |
| Moondance Cancer Initiative | Health & social care | 2019 |
| Moonduc Ltd | Information & communication | 2023 |
| Mooneeram Worth Law Limited | Professional & scientific | 2002 |
| Mooneerams Limited | Professional & scientific | 2006 |
| Mooney Mortgage and Protection Limited | Financial services | 2023 |
| Moongracia Ltd | Wholesale & retail | 2025 |
| Moonhaven Trade Ltd | Wholesale & retail | 2025 |
| Moonlight Theatre Limited | Arts & recreation | 2018 |
| Moonlitmeadow Ltd | Wholesale & retail | 2025 |
| Moonpearl Limited | Hospitality | 2005 |
| Moonstone Letts Limited | Households | 2015 |
| Moontil Limited | Information & communication | 2026 |
| Moonu VK Limited | Wholesale & retail | 2025 |
| Moorcastle Investments Ltd | Real estate | 2021 |
| Moore & Johnson Limited | Construction | 2022 |
| Moore Cooper Ltd | Information & communication | 2024 |
| Moore Drama Limited | Education | 2025 |
| Moore Education CIC | Education | 2024 |
| Moore Kick Fit Ltd | Other services | 2023 |
| Moore Knight Limited | Professional & scientific | 2006 |
| Moore Rentals Ltd | Real estate | 2022 |
| Moore Trees Ltd | Agriculture & fishing | 2017 |
| Moorescue Ltd | Wholesale & retail | 2018 |
| Moorfield Capital Partners Investment L.P. | | 1999 |
| Moorhead Close Block C Ltd | Real estate | 2015 |
| Moorhead Incorporation Limited | Extraterritorial | 2026 |
| Mooring Singh Associates Limited | Real estate | 2003 |
| Moorland Environmental Ltd | Water & waste | 2011 |
| Moorland Road Ltd | Hospitality | 2008 |
| Moorlap Ltd | Real estate | 2018 |
| Moorpower Properties Ltd | Real estate | 2024 |
| Moorside Estates Ltd | Other services | 2025 |
| Moorview Export Ltd | Wholesale & retail | 2025 |
| Moov Extra Ltd | Professional & scientific | 2024 |
| Moov Trading Co Ltd | Transport & logistics | 2020 |
| Moove to Ltd | Real estate | 2020 |
| Mooving Group Ltd | Professional & scientific | 2018 |
| Mopbucket Cleaners Ltd | Administrative & support | 2019 |
| Moppic Ltd | Education | 2015 |
| Moppong Ltd | Other services | 2025 |
| Moqum Trading Ltd | Wholesale & retail | 2025 |
| Mora Trading Ltd | Wholesale & retail | 2024 |
| Morabe Ltd | Wholesale & retail | 2025 |
| Morabic Ltd | Education | 2025 |
| Moracle Clothing Limited | Wholesale & retail | 2026 |
| Morah Morah Ltd | Wholesale & retail | 2010 |
| Moralem Ltd | Real estate | 2024 |
| Moran H&S Ltd | Professional & scientific | 2023 |
| Mordecai Executive Concierge Limited | Administrative & support | 2025 |
| Mordecai London Ltd | Wholesale & retail | 2026 |
| More 24/7 Services Limited | Administrative & support | 2025 |
| More Contracting Ltd | Construction | 2021 |
| More Life Style Management Ltd | Financial services | 2022 |
| More Recruits Ltd | Administrative & support | 2023 |
| More Talent Less Limited | Wholesale & retail | 2023 |
| More Than OBM Ltd | Administrative & support | 2025 |
| More the Merrier Limited | Hospitality | 2017 |
| More to Explore Limited | Wholesale & retail | 2024 |